CA2067308A1 - Structure for expansion and contraction of guard baton - Google Patents
Structure for expansion and contraction of guard batonInfo
- Publication number
- CA2067308A1 CA2067308A1 CA002067308A CA2067308A CA2067308A1 CA 2067308 A1 CA2067308 A1 CA 2067308A1 CA 002067308 A CA002067308 A CA 002067308A CA 2067308 A CA2067308 A CA 2067308A CA 2067308 A1 CA2067308 A1 CA 2067308A1
- Authority
- CA
- Canada
- Prior art keywords
- cylindrical member
- top end
- contraction
- baton
- slide guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000008602 contraction Effects 0.000 title claims abstract description 30
- 238000005299 abrasion Methods 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 abstract description 4
- 239000000543 intermediate Substances 0.000 description 30
- 230000006835 compression Effects 0.000 description 5
- 238000007906 compression Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 229910001069 Ti alloy Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- WWYNJERNGUHSAO-XUDSTZEESA-N (+)-Norgestrel Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](CC)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 WWYNJERNGUHSAO-XUDSTZEESA-N 0.000 description 1
- 241001269524 Dura Species 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 125000001153 fluoro group Chemical group F* 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B15/00—Weapons not otherwise provided for, e.g. nunchakus, throwing knives
- F41B15/02—Batons; Truncheons; Sticks; Shillelaghs
- F41B15/022—Batons; Truncheons; Sticks; Shillelaghs of telescopic type
- F41B15/025—Batons; Truncheons; Sticks; Shillelaghs of telescopic type the telescoping sections being locked by coacting conical end surfaces, i.e. by friction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B15/00—Weapons not otherwise provided for, e.g. nunchakus, throwing knives
- F41B15/02—Batons; Truncheons; Sticks; Shillelaghs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
- F16B7/10—Telescoping systems
- F16B7/105—Telescoping systems locking in discrete positions, e.g. in extreme extended position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
- F41B15/00—Weapons not otherwise provided for, e.g. nunchakus, throwing knives
- F41B15/02—Batons; Truncheons; Sticks; Shillelaghs
- F41B15/022—Batons; Truncheons; Sticks; Shillelaghs of telescopic type
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Braking Arrangements (AREA)
- Fishing Rods (AREA)
- Endoscopes (AREA)
- Steering Controls (AREA)
Abstract
Abstract of the Disclosure An expansion and contraction type guard baton causing less rattling or deviation even after repeating use and free from the worry of slipping off by the force of thrusting and extending the baton main body even if the wall thickness is decreased to reduced the weight. A plurality of cylin-drical members are combined in a telescopic manner in which the conically inclined surface at the top end of an outer cylindrical member and a conically inclined surface at the rear end of an inner cylindrical member are engaged for preventing slip-off upon extension. The circumferen-tial cylindrical slide guide surface in parallel with the cylindrical axis formed before and after the conically inclined surface and the cylindrical member are put to a plane-to-plane contact, thereby preventing rattling or deviation. Further, the wall thickness at the top end of the outer surface of the outer cylindrical member is increased to prevent slip-off.
Description
~06730~
SPECIFICATION
Title of the Invention Structure for Expansion and Contraction o~ Guard Baton Background of the Invention Field o-f the Invention The present invention concerns a structure for expan-sion and contraction tube guard baton using a telescopic pipe constitution and, more in particular, it relates to a structure ~or expanslon and contraction o~ a ~uard baton capable of extending and contractin~ extremely smoothly, with neither rattling nor deviation and having improved dura~ility.
Descrlption of the Prior ~rt As an existent structure for expansion and contraction o~ guard batons o-E this type, there has been known, ~or e~ample, such a structure that a plurality of cylindrical members each of di~erent diameter are combined in a telescopic manner, in which an lnclined outer sur-face at ~he rear end of an inner cylindrical member is engaged to an înclined inner sur-~ace at the top end of a cylindrical member ~ust outside thereto in an anti-slip off ~ashion.
SPECIFICATION
Title of the Invention Structure for Expansion and Contraction o~ Guard Baton Background of the Invention Field o-f the Invention The present invention concerns a structure for expan-sion and contraction tube guard baton using a telescopic pipe constitution and, more in particular, it relates to a structure ~or expanslon and contraction o~ a ~uard baton capable of extending and contractin~ extremely smoothly, with neither rattling nor deviation and having improved dura~ility.
Descrlption of the Prior ~rt As an existent structure for expansion and contraction o~ guard batons o-E this type, there has been known, ~or e~ample, such a structure that a plurality of cylindrical members each of di~erent diameter are combined in a telescopic manner, in which an lnclined outer sur-face at ~he rear end of an inner cylindrical member is engaged to an înclined inner sur-~ace at the top end of a cylindrical member ~ust outside thereto in an anti-slip off ~ashion.
2~730~
This is a key holder of a telescopic structure whlch is not the guard baton itsel~ but is applicable thereto (US
Patent No. 4,752,027). Elowever, ln the structure of this prior art, both of the outer surface and the inner sur-face at the top end of the outer cylindrical member are formed as inclined surfaces tapered as far as the top end, while both of the outer surface and the inner surface at the rear end of the inner cyllndrical member are also formed as inclined surfaces tapered as far as the rear end.
Therefore, this structure involves the following problems.
(1) The top end of the inclined inner surface of the outer cylindrical member is in a sliding contact with the cylindrical outer surface of the inner cylindrical member substantially along an annular line of contact, and the rear end o~ the inelined outer sur~Face of the inner cylindrical member is also in a sllding contact with the cylindrical inner surface of the outer cylindrlcal member substantially along an annular line of contact and they are guided in this state upon extension and contraction. Accordingly, the top end of the guide o~ the outer cylindrical member and the rear end of the guide of the inner cylindrical member are liable to be abraded and, as a result, a clearance at the guide portion is increased tending to cause rattling or deviation.
(~) The rigidity o~` the ~uard baton, when it is extended, 2~30~
has been insufficient and this is assumed to be caused by the rattling described above. In particular, a force or impaet may sometimes be exerted on the ~uard baton in the direction in perpend~cular to the axis of the baton and it is considered that such a force or impact, being coupled with the rattling, makes the rigidity of the baton insuf-ficient in a state where it is extended.
This is a key holder of a telescopic structure whlch is not the guard baton itsel~ but is applicable thereto (US
Patent No. 4,752,027). Elowever, ln the structure of this prior art, both of the outer surface and the inner sur-face at the top end of the outer cylindrical member are formed as inclined surfaces tapered as far as the top end, while both of the outer surface and the inner surface at the rear end of the inner cyllndrical member are also formed as inclined surfaces tapered as far as the rear end.
Therefore, this structure involves the following problems.
(1) The top end of the inclined inner surface of the outer cylindrical member is in a sliding contact with the cylindrical outer surface of the inner cylindrical member substantially along an annular line of contact, and the rear end o~ the inelined outer sur~Face of the inner cylindrical member is also in a sllding contact with the cylindrical inner surface of the outer cylindrlcal member substantially along an annular line of contact and they are guided in this state upon extension and contraction. Accordingly, the top end of the guide o~ the outer cylindrical member and the rear end of the guide of the inner cylindrical member are liable to be abraded and, as a result, a clearance at the guide portion is increased tending to cause rattling or deviation.
(~) The rigidity o~` the ~uard baton, when it is extended, 2~30~
has been insufficient and this is assumed to be caused by the rattling described above. In particular, a force or impaet may sometimes be exerted on the ~uard baton in the direction in perpend~cular to the axis of the baton and it is considered that such a force or impact, being coupled with the rattling, makes the rigidity of the baton insuf-ficient in a state where it is extended.
(3) If the wall thickness of the cylindrical member is decreased for the reduction of the weight, the inclined inner sur~ace of the outer cylindrical member is pushed by the inclined outer surface of the inner cylindrical member and tends to be opened outward when the baton is extended under an intense force. Therefore, the inner dlameter is enlarged to make the inner cylindr:Lcal member slip out o-f the outer cylindrical member.
Further, a guard baton of an expanslble and contractlble structure is disclosed in Japanese Patent Utility Model Laid-Open Sho 61-181996, in which the inner and outer members have a plane-to-plane contact portion. However, in an extended state, a return stopper resiliently protruded outward ~ormed by notching an inner tubular member engages the top end surface of the outer tubular member thereby preventing the inner tubular member from returning. AccordinglYI there is a problem for the strength of the notched portion.
2~67308 Further, although an expansible and contractible mechanism is also disclosed in Japanese Utility Model Laid-Open Sho 63-90796, no detailed inner structure is mentioned or disclosed.
Summary o-f the Invention It is, accordingly, an obJect of the present inven-tion to overcome the ~oregoing problems in the prior art and provide a structure for expansion or contraction of a guard baton which causes less rattling or deviation even a-fter repeating use and which is free from the worry of slipping off caused by an extending force even if the weight is reduced.
The foregoing ob~ect of the present invention can be attained by a structure for expansion and contraction of a guard baton comprising a plurality of cylindrical members each o~ different dlameter combined in a telescopic manner, in which an inclined surface at the rear end of an inner cylindrical member is made engageable with an inclined surface at the top end of a cylindrical member ~ust outside thereto in an extended state, wherein the top end of the outer cylindrical member has an outer circumferentlal cylindrical sur-face in parallel with the cylindrical axis and an inner surface having a conically inclined surface tapered toward the top end and a circum-20~7308 , ferential cylindrical slide guide sur-face in contiguous with the top end of the conically incl~ned surface and in parallel with the cylindrical axis, and the rear end of the inner cylindrical member has an outer circumferential cylindrical slide guide surface in parallel with the cylindrical axis and a conically inclined surface tapered toward the top end and in contiguous with the slide guide surface, in which the slide guide surface of the outer cylindrical member is put to a slidable contact with the outer circum~erential sur~ace of the inner cylindrical member and the slide guide surface of the inner cylindrical member is put to a slidable contact with the inner circum-ferential surface of the outer cylindrical member respec-tively, and a vent hole may be disE)osed to at least one position of the guard baton.
In a preferred embodiment of the present invention, a step is disposed between the inner circum-~erential surface and the base of the conically incllned sur~ace of the outer cylindrical member and another step is also disposed between the slide guide surface and the conically inclined surface of the inner cylindrical member for enabling engage-ment at the steps.
In another embodimentl an abrasion resistant layer is formed to the inner surface of the outer cylindrical member and the outer surface of the inner cylindrical ~730~
member.
In a further embodiment, a ring made of an abrasion resistant material and having a slide guide surface is attached to the top end of the outer cylindrical member.
In a further embodiment, a ring made of an abrasion reslstant material and having a slide guide surface is attached to the rear end o~ the inner cylindrical member.
In a further embodiment, an angle of inclination for each of the conical engaging surfaces of the outer cylindrical member and the inner cylindrical member is defined as withln a range of 1 to 2.
Upon extension and contraction, the slide guide surface formed cylindrically to the outer cylindrical member is put to a plane-to-plane contact with the cylin-drical outer surface of the inner cylindrical member, and the slide guide sur~ace formed cylindrically to the inner cylindrical member is put to a plane-to-plane contact with the cylindrical inrler surface of the outer cylindrical surface, respectively, and they are guided in this state.
Therefore, rattling or deviation can be reduced remarkably as compared with the structure in the prior art. Further, the structure causeæ less abrasion even after repeating extension and contraction and can suppress the rattling or deviation to a reduced level even after long time use.
Further, even if the wall thickness of the cylindrical 2~7308 member is decreased, as a whole, to reduce the wei~ht, only the top end of the outer cylindrical member is -formed cylindrical at the outer surface to increase the wall thickness locally. Accordingly, even when a large extending forces is applled, the member has a great resis-tance against the force of opening the top end of the cylindrical member outward, to prevent the inner cylindrical member from slipping off. In a case where the outer cylindrical member and the inner cylindrlcal member are engaged by way of the steps, the anti-slipping function is further improved. Further, if the angle of inclination for each o~ the conical engaglng sur-~aces of the outer cylindrical member and the inner cylindrical member is made greater than 1. There is no worry that the inner cylindrical member slips o-f-~ due to slight dimensional error upon fabrication.
Furthermore, the durability o-f the structure can be improved remarkably b~ providing a means such as ~orming an abrasion resistant layer to the inner surface of the outer cylindrical member or the outer surface of the inner cylindrical member, attaching a ring made of an abrasion resistant material and having a slide guide surface to the top end of the outer cylindrical member or attaching a ring made of an abrasion resistant material and having a slide guide sur~ace to the rear end o~ the inner cylindrical 206730~
member.
Particularly, since the guard baton has a su-fficient rigidity in an extended state. The present lnvention is particularly effective when it is applied to a guard baton with a cross handle, to which compressive force is possibly exerted intensely.
DESCRIPTION OF THE APPENDED DRAWINGS
Fig. 1 is an entire perspective view of an expansion and contraction type guard baton with a crosshandle as a first embodiment of the present invention;
Fig. 2 :Ls a vertical cross sectional view of the guard baton shown in Fig. 1;
Fig. 3 is an enlarged cross sectional view o-E a portion -Eor explaining a structure for expansion and contractlon;
Fig. 4 is a slde elevatlonal view partially ln cross section of a modified embodiment of the guard baton shown in Fig. l;
Fig. 5 is a cross sectional vlew for a portion of a structure -for expansion and contraction of a guard baton main body 1 in a sécond embodiment o-E the present invention;
Fig. 6 is a cross sectional view for a portion of a third ambodiment of the present inventlon;
- 2~73~
Fig. 7 is a front elevational view for an abrasion resistant member in a fourth embodiment of the present invention;
Fig. 8 is a cross sectional view for a portion of a fourth embodiment of the present invention;
Fig. 9 is a front elevational view for a portion of an abrasion resistant member in a fifth embodiment of the present invention; and Fig. 10 is a side elevational view of the member shown in Fig. 9.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Description will now be made to preferred embodiments of the present invention with referlence to the drawings.
Fig. 1. is an entire perspective view of an expansion and contraction type guard baton with a croæshandle as a first embodiment o~ the present invention, Fig. 2 is a vertical cross sectlonal view thereof and Fig. 3 is an enlarged cross sectional view of a portion for illustrating a structure for e~pansion and contraction.
In Fig. 1. a baton main body 1 is shown by a solid line in a contracted state and by a do-tted chain in a state extended to a length L. The ~aton main body 1 has a crosshandle 2 with a length as can be gripped by one hand, which is branched in perpendicular from the batvn 2 0 ~
main body 1 at a position displaced somewhat from the center to one end in the lon~itudinal direction of the baton main body 1, that is, at a position near a hilt A
disposed at one end of the baton main body 1. The hilt A
comprises a cylindrical member A1 made of a synthetic resin, wood or light metal through which the baton main body 1 is inserted.
As shown in Fig. 2, the crosshandle 2 of this embodi.-ment has a support shaft 6 extended vertically from a mounting base 5 for securing to the baton main body 1 in perpendicular to the baton main body 1 and it is consti-tuted as an upper/lower rotational type crosshandle, com-prising a relatively rotational lower member 7 rotatably put ~it around a base end 6a of the support shaft 6, an relatively rotational upper member 8 rotatably put around a top end 6b of the support shaft 6 and a statlc member 9 through which an intermediate portion 6c o~ the support sha-Pt 6 is inserted and which is secured to the support shaft 6 at a position between the relatively rotational upper and lower members 7 and 8.
The baton main body 1 has a telescopic structure comprising a plurality of (three in the illustrated em-bodiment) cylindrical members 25, 26, and 27 each of di-fferent diameter. The outer cylinder 25 of the greatest diameter has female threads 28 formed at the inner circum-2~6~3~
ferential surface on the side of the rear end being extendedfrom the opening to the inside, a plug 29 having outer circumferential threads and screwed at the inside, and a cap 30 screwed at the rear end opening as a cover. In the outer cylinder 25, the outer circumferential surface comprises a cylindrical surface 25a formed in parallel with the cylindrical axis, and an inner circumferential surface comprises an inclined surface 25d at the top end, being tapered (converged) toward the top end. An inter-mediate cylinder 26 contained at the inside of the outer cylinder 25, as an inner cylindrical member, has an inclined sur-face 26f formed to the outer surface on the rear end, and the outer diameter thereof is slightly enlarged toward the rear end opening so as to be e~gageable with the inclined surface 25d of the outer cylinder 25. The top end of the intermediate cylinder 26 has an inclined surface 26d formed to the inner circumferential sur~ace, being tapered to the top end. An inner cylinder 27 contained at ~he inslde o~ the intermediate cylinder 26 has an inclined surface 27~ to the outer surface of the rear end and the outer diameter thereof is slightly enlarged *oward the rear end opening so as to be enga~eable with the inclined surface 26d at the top end of the intermediate inner cylinder ~6. Female threads are formed at -the inner surface of the top end opening to which a cap 36 is 2~673~8 screwed. The rear end o-f the inner cylinder 27 has such an inner diameter as capable of engaging a -forked spring 38, which is screw-set to the plug 29 ~hen the guard baton is contracted. The base of the cap 36 at the top end has such a size capable o* engaging the top end o-f the inter-mediate cylinder 26.
Referrin~ more specifically to the structure -for expansion and contraction of the baton main body 1 with reference to the enlarged cross sectional view of Fig. 3, the outer cylinder 25 as the outer cylindrical member and the intermediate cylinder 26 (an outer cylindrical member to the ~nner cyllnder 27) are shaped at their top end portions, such that each o~ their outer surfaces 25a 126a) has no inclination in the axial direction, that is, as a cyli~ldrical shape having a circumfe~rential surface in parallel with the cyllndrical axis. On the other hand, at the inner sur~ace o-f each of the top end portions, there are formed conically inclined tapered sur-faces 25d (26d) and a cylindrlcal slide guide sur~ace 25c (26c~
having a circumferential sur-face in parallel with the cylindrical a~is and conti~uous to the top end Or the conically inclined surface 25d (26d). On the other hand, each of the intermediate cylinder 26 as the inner cylindrical member (inner cylindrical member to the outer cylinder 25) and the inner cylinder 27 has, at the outer surface of the -` 2~73~8 rear end, a cylindrical slide guide surface 26e (27e) as a circumferential surface in parallel with the cylindrical axis and a conically inclined tapered surface 26f (27F) in contiguous with the slide guide surface 26e (27e), orderly from the rear end.
The slide guide surface 25c at the inner surface on the top end of the outer cylinder 25 and the cylindrical outer circumferential surfaee 26a of the intermediate cylinder 26 in parallel with the cylindrical axis are fit to each other with a slight clearance, and the slide gulde surface 26e on the outer surface at the rear end of the intermediate cylinder 26 and the cylindrical inner elrcumferential surface 25b of the outer cylinder 25 in parallel with the eylindrical axis are fit to each other with a slight clearance. Further, the slide guide surface 26e on the inner surfaee at the top end o-f the intermediate eylinder 26 and the cylindrieal outer eireumferential surface 27a of the inner cylinder 27 in parallel with the eylindrical axis are fit to each other with a slight elearanee, and the slide guide surfaee 27e on the outer surEace at the rear end of the inner eylinder 27 and the eylindrieal inner circumferential surfaee 26b of the intermediate eylinder 26 in parallel with the eylindrieal axis are fit to eaeh o-ther with a slight elearanee.
- ~.3 ~7308 At leas~ one bent hole 31 is formed to the circumfe-rential side o-~ the outer cylinder 25. Alternatively, the bent hole 31 may be disposed to the intermediate cylinder 26 or the inner cylinder 27, to the cap 30 attached to the rear end of the outer cylinder or to the cap 36 attached to the top end of the inner cylinder 27, or the hole may be replaced with a groove or slit, so long as air can flow freely between the inside and the outside of the cylindrical member of the baton main body 1 to ensure smooth extending and contracting operation.
In this embodiment, an angle o~ inclination for the conically inclined surface 25d of the outer cylinder, each of the conically inclined sur-faces 26d and 26f of the intermediate cylinder and the conical inclined surface 27-of the inner cylinder 27 is preferably within a range from 1 to 2. If the angle is smaller than 1, it requires a large force for releasing engageme:nt between each of the inclined surfaces and containing the intermediate cylinder 26 in the outer cylinder ~5 and the inner cylinder 27 in the intermediate cylinder 26, respectivel~, thereby making it difficult to contract the baton main body 1. Further, depending on the fabrication error, there may be a worry that the inner cylindrical member slips and -flies out o~
the outer cylindrical member by the swinging force upon extending the baton main body 1. On the other hand, if 2~73~
the angle of inclination is greater than 2, engagement between each of the inclined sur~aces is weakened in an extended state to bring about a worry that the engagemen-t is released by the reaction of thrusting an opponent, to contract the baton main body 1. By the way, baton main bodies 1 were experimentally manufactured with the angle o-f inclination (tapered angle) being varied to three steps, that is, 1, 1.5 and 2 and the relationship between the tensile load and the maximum compression load in the axial direction were determined. Test data are shown in Table 1.
As the test method, the manufactured main body 1 was used as a test piece, which was set to a universal material tester, applied with an axial tensile load -from the both ends, then compressed in the opposite direction, and the maximum compression load was measured. The test was entrusted to the Pre~ectural Industrial Technical Center o~ Ehime.
- 1~
2~730~
Table 1 Tensile Maximum Compression Load (Kg~) load (Kg-~) Taper 1.0 Taper 1.5Taper 2.0 400 340 315 240.
500 ~10 390 290 55~ 555 400 365 600 540 470 3~0 When the expansion and contraction type guard baton is actually used, the baton main body 1 is swung by a hand to thrust out and extend the inner cylindrical member. The extending force in this case corresponds to the tensile load shown in Table 1. Further, -~or contracting the extended baton main body 1, -the top end o~ the baton main body 1 is hit and pressed, to house the inner cylindrical member. The presslng ~orce in this case corresponds to 2~7308 the maximum compression load in Table 1. It can be seen from the table that when the inner cylindrieal member is thrusted out by a force corresponding, *or example, to 300 Kg-f of the tensile load, 260 Kgf of a force is required for contracting it in a case o~ the tapered angle of 1 but it may be reduced to a force o-f 180 Kgf in a case of the tapered angle of 2. In other words it is apparent that a greater force has to be applied for contraction if the tapered angle is smaller than 1 and that contraction is difficult af-ter the cylindrical member with a smaller tapered angle has been thrusted with a large force. On the contrary, if the tapered an~le exceeds 2, the compression load is further reduced and the inner cylindrical member is contracted after it is thrusted strongly and the functlon of the guard baton can not be attained.
Description will be made t~ t~he operation.
When a centrifugal force is applied to the baton main body 1 by gripping the crosshandle 2 or the grip A in a state where each o~ the cylinders 25, 26 and 27 is contained successi~ely in a telescopic rashion (Fig. 2), the inter-mediate cylinder 2~ and the inner cylinder 27 are thrusted out and extended. In this case, the cylindrical outer circumferential surface 26a of the intermediate cylinder 26 in parallel with the cylindrical axis is guided, being in a slight plane-to-planf~ contact, along the-slide guide 2~73~
face 25c at the top end of the outer cylinder 25, and the slide guide surface 26e at the rear end of the intermediate cylinder 26 is guided, whlle being in a slight plane-to-plane contact, along the cylindrical inner circumferential surface 25b of the outer cylinder 25 in parallel with the cylindrical axis. In the same way, the cylindrical outer circum-ferential surface 27a of the inner cylinder 27 ln parallel with the cylindrical axis is guided, while being in a slight plane-to-plane contact, along the slide guide surface 26c at the top end O-r the inner cylinder 26, and the slide gu:Lde surface 27e at the rear end of the inner cylinder 27 ls guided, while being in a slight plane-to-plane contact, along the cylindrical inner circumferential surface 26b of the intermediate cylinder 26 in parallel with the cylindrical axis. Accordingly, the intermediate cylinder 26 and the inner cylinder 27 can move extremely smoothly wlth neither rattllng nor devlation. ~urther, since the slide guide surfaces 25c, 26e, 26c and 27e are put to plane-to-plane contact with each o-ther, their abrasion is reduced extremely as compared with case of line-to-line contact in the prlor art even when the baton is put to repea-ting extending and contracting operatisn for a long period of time, the working life can be improved greatly.
When they are completely extended, the incllned surface 26f at the rear end of $he intermediate cylinder 26 thrusted 2$1~730~
out of the outer cylinder 25 engages the inclined sur~ace 25d at the top end o-f the outer cylinder 25, and the inclined surface 27f at the rear end of the inner cylinder 27 thrusted out of the intermediate cylinder 27 engages the inclined surface 26b at the top end of the intermediate cylinder 26 and they are retained from slipping o-ff.
Upon engagement, a strong impact is applied to the outer cylinder 25 as the outer cylindrical member (and the inner cylinder 26) at the inclined surface 25d (and 26d) at the top end portion, and the component o~ the force along *he inclined surface is exerted in the direction o-f opening outward. In the present invention, since the outer sur-face of the outer cylinder 25 (and the inner cylinder 26) is made cylindrlcal as far as the top end so that the wall thickness at the top end which was liable to suffer from deformation in the existent structure is locally increased, it is less de~ormed even if a large force is exerted in the direction of openin~ outward. There-~ore, if the baton main body 1 is thrusted out with a large force, it can be preven*ed from slipping off. In addition, the wall thick-ness for each of the cylindrical members can be decreased, AS a whole, to reduce the weight.
Fig. 4 shows a modi-~ied structure of the first em-bodiment, in which a guard portion 40 ls attached instead of the crosshandle to the baton main body 1. The structure 3 ~ $
for expansion and contraction of the baton main body 1 is the same as in the first embodiment.
Fig. 5 shows a portion o-~ a structure for expansion and contraction o-f -the baton main body 1 in a second embodiment of the present invention.
In this embodiment, a step 51 is formed between an inner circumferential surface 25b (26b) at the top end and the base of an inclined surface 25d (and 26d) of an outer cylinder 25 as an outer cylindrical member (and an inter-mediate cylinder 26), while another step 62 engageable with the step 51 is disposed between a slide guide sur~ace 26e (27e) and an inclined surface 26-f (27~) of the interme-diate cy~inder 26 as an inner cylindrical member (and an inner cylinder 27). This modified embodiment has a merit of providlng a -further improved ef-~ect -for preventing slipping off by the engagement of the steps 51 and 52 to each other.
Fig. 6 shows a portion o-f a third embodiment of the present invention.
In this embodiment, a ring 55 made of an abrasion resistant material and having a slide guide surface 25c (26c) is attached to the top end of an outer cylinder 25 as an outer cylindrical member (and an intermediate cylinder 26). As the abrasion resistant material, titanium alloy or like other hard metal or a synthetic resin o-~ low 2~673~
frictional resistance such as a fluoro resin is pre-ferred.
Figs. 7 and 8 show a portion for a fourth embodiment O-r the present invention.
In this embodiment, a ring 56 made of the same abrasion resistant mzterial as described above and having a slide surface guide 26e 127e) is fit to the rear end of an intermediate cylinder 26 as the inner cylindrical member ~and an inner cylinder 27) and fixed by screwing a thread-clamping ring 57. The sliding guide surface 26e (27e) is spherically protruded at a plurality of portions (four portions in the illustrated embodiment) from the outer circumferential surface of the abrasion reslstant ring 56.
Fig. 9 shows a -fifth embodiment according to the present invention, which is dlfEerent -from the fourth embodiment shown in Figs. 7 and 8 in that the slide guide sur-Eace 26e t27e) of the abrasion resistant ring 59 is formed as a cylindrical surface.
Each of the third to fi-fth embodiments has a merit capable of outstandingly impro~ing the durability by -forming the sllde guide surface with the abrasion resistant material separately from the cylindrical member.
Although not illustrated in the drawings, the inner surfaces of the outer cylinder 25 as the outer cylindrical member and the intermediate cylinder 26 and the outer sur-faces of the intermediate cylinder 26 and the inner %~73~
cylinder 27 as the inner cylindrical member may be formed with an abrasion resistant layer, for example, by applying a nitriding treatment or a coating with a titanium alloy layer, for improving the durability.
As has been described above, in the expansion and contraction type guard baton according to -the present invention, since a slide guide surface is -formed at each of the ends of the inclined surfaces of the outer cylindrical member and the adjacent inner cylindrical member along which they are engaged, in a plane-to-plane contact with the circumferential surface of the cylindrical member, lt can provide an advantageous effect of providin~
an extremely smooth e~tendlng and contracting operation and reducing abrasion at the end of the inclined surface even a~ter repeating use, thereby ~reventing rattling or dev:lation for a long period of time. Further, since the abrasion resistance of the slide guide surface and the contact surface thereof is enhanced, it can provide an effect capa~le of outstandingly improving the durability as compared ~ith the existent structure. Further, since the outer sur~ace a* the top end of the outer cylindrical member is formed cylindrically and the inner surface thereof is disposed with the conicall~ inclined surface tapered toward the top end and a cylindrical slide guide surface in contiguous to the top end of the conically inclined ~730~
surface, thereby increasing the wall thickness locally at the top end, it can provide an advantageous effect that the top end of the outer c~lindrical member is less opened upon extension, thereby preventing the inner cylindrical member from slipping off even if a strong impact is applied to the top end of the outer cylindrical member. Further, since the steps are formed at the engaging portion between the inner and the outer cylindrical members thereby restricting the angle of inelination for each of the inclined surfaces, this can provide a fur-ther improved anti-slip off effect.
In part:lcular, when the structure for expansion and eontraetion o~ the present invention is applied to a guard baton with a crosshandle, it can provide a su-fficient rigidity in the extended state of the guard baton $o attain hlgh reliability.
- ~3
Further, a guard baton of an expanslble and contractlble structure is disclosed in Japanese Patent Utility Model Laid-Open Sho 61-181996, in which the inner and outer members have a plane-to-plane contact portion. However, in an extended state, a return stopper resiliently protruded outward ~ormed by notching an inner tubular member engages the top end surface of the outer tubular member thereby preventing the inner tubular member from returning. AccordinglYI there is a problem for the strength of the notched portion.
2~67308 Further, although an expansible and contractible mechanism is also disclosed in Japanese Utility Model Laid-Open Sho 63-90796, no detailed inner structure is mentioned or disclosed.
Summary o-f the Invention It is, accordingly, an obJect of the present inven-tion to overcome the ~oregoing problems in the prior art and provide a structure for expansion or contraction of a guard baton which causes less rattling or deviation even a-fter repeating use and which is free from the worry of slipping off caused by an extending force even if the weight is reduced.
The foregoing ob~ect of the present invention can be attained by a structure for expansion and contraction of a guard baton comprising a plurality of cylindrical members each o~ different dlameter combined in a telescopic manner, in which an inclined surface at the rear end of an inner cylindrical member is made engageable with an inclined surface at the top end of a cylindrical member ~ust outside thereto in an extended state, wherein the top end of the outer cylindrical member has an outer circumferentlal cylindrical sur-face in parallel with the cylindrical axis and an inner surface having a conically inclined surface tapered toward the top end and a circum-20~7308 , ferential cylindrical slide guide sur-face in contiguous with the top end of the conically incl~ned surface and in parallel with the cylindrical axis, and the rear end of the inner cylindrical member has an outer circumferential cylindrical slide guide surface in parallel with the cylindrical axis and a conically inclined surface tapered toward the top end and in contiguous with the slide guide surface, in which the slide guide surface of the outer cylindrical member is put to a slidable contact with the outer circum~erential sur~ace of the inner cylindrical member and the slide guide surface of the inner cylindrical member is put to a slidable contact with the inner circum-ferential surface of the outer cylindrical member respec-tively, and a vent hole may be disE)osed to at least one position of the guard baton.
In a preferred embodiment of the present invention, a step is disposed between the inner circum-~erential surface and the base of the conically incllned sur~ace of the outer cylindrical member and another step is also disposed between the slide guide surface and the conically inclined surface of the inner cylindrical member for enabling engage-ment at the steps.
In another embodimentl an abrasion resistant layer is formed to the inner surface of the outer cylindrical member and the outer surface of the inner cylindrical ~730~
member.
In a further embodiment, a ring made of an abrasion resistant material and having a slide guide surface is attached to the top end of the outer cylindrical member.
In a further embodiment, a ring made of an abrasion reslstant material and having a slide guide surface is attached to the rear end o~ the inner cylindrical member.
In a further embodiment, an angle of inclination for each of the conical engaging surfaces of the outer cylindrical member and the inner cylindrical member is defined as withln a range of 1 to 2.
Upon extension and contraction, the slide guide surface formed cylindrically to the outer cylindrical member is put to a plane-to-plane contact with the cylin-drical outer surface of the inner cylindrical member, and the slide guide sur~ace formed cylindrically to the inner cylindrical member is put to a plane-to-plane contact with the cylindrical inrler surface of the outer cylindrical surface, respectively, and they are guided in this state.
Therefore, rattling or deviation can be reduced remarkably as compared with the structure in the prior art. Further, the structure causeæ less abrasion even after repeating extension and contraction and can suppress the rattling or deviation to a reduced level even after long time use.
Further, even if the wall thickness of the cylindrical 2~7308 member is decreased, as a whole, to reduce the wei~ht, only the top end of the outer cylindrical member is -formed cylindrical at the outer surface to increase the wall thickness locally. Accordingly, even when a large extending forces is applled, the member has a great resis-tance against the force of opening the top end of the cylindrical member outward, to prevent the inner cylindrical member from slipping off. In a case where the outer cylindrical member and the inner cylindrlcal member are engaged by way of the steps, the anti-slipping function is further improved. Further, if the angle of inclination for each o~ the conical engaglng sur-~aces of the outer cylindrical member and the inner cylindrical member is made greater than 1. There is no worry that the inner cylindrical member slips o-f-~ due to slight dimensional error upon fabrication.
Furthermore, the durability o-f the structure can be improved remarkably b~ providing a means such as ~orming an abrasion resistant layer to the inner surface of the outer cylindrical member or the outer surface of the inner cylindrical member, attaching a ring made of an abrasion resistant material and having a slide guide surface to the top end of the outer cylindrical member or attaching a ring made of an abrasion resistant material and having a slide guide sur~ace to the rear end o~ the inner cylindrical 206730~
member.
Particularly, since the guard baton has a su-fficient rigidity in an extended state. The present lnvention is particularly effective when it is applied to a guard baton with a cross handle, to which compressive force is possibly exerted intensely.
DESCRIPTION OF THE APPENDED DRAWINGS
Fig. 1 is an entire perspective view of an expansion and contraction type guard baton with a crosshandle as a first embodiment of the present invention;
Fig. 2 :Ls a vertical cross sectional view of the guard baton shown in Fig. 1;
Fig. 3 is an enlarged cross sectional view o-E a portion -Eor explaining a structure for expansion and contractlon;
Fig. 4 is a slde elevatlonal view partially ln cross section of a modified embodiment of the guard baton shown in Fig. l;
Fig. 5 is a cross sectional vlew for a portion of a structure -for expansion and contraction of a guard baton main body 1 in a sécond embodiment o-E the present invention;
Fig. 6 is a cross sectional view for a portion of a third ambodiment of the present inventlon;
- 2~73~
Fig. 7 is a front elevational view for an abrasion resistant member in a fourth embodiment of the present invention;
Fig. 8 is a cross sectional view for a portion of a fourth embodiment of the present invention;
Fig. 9 is a front elevational view for a portion of an abrasion resistant member in a fifth embodiment of the present invention; and Fig. 10 is a side elevational view of the member shown in Fig. 9.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Description will now be made to preferred embodiments of the present invention with referlence to the drawings.
Fig. 1. is an entire perspective view of an expansion and contraction type guard baton with a croæshandle as a first embodiment o~ the present invention, Fig. 2 is a vertical cross sectlonal view thereof and Fig. 3 is an enlarged cross sectional view of a portion for illustrating a structure for e~pansion and contraction.
In Fig. 1. a baton main body 1 is shown by a solid line in a contracted state and by a do-tted chain in a state extended to a length L. The ~aton main body 1 has a crosshandle 2 with a length as can be gripped by one hand, which is branched in perpendicular from the batvn 2 0 ~
main body 1 at a position displaced somewhat from the center to one end in the lon~itudinal direction of the baton main body 1, that is, at a position near a hilt A
disposed at one end of the baton main body 1. The hilt A
comprises a cylindrical member A1 made of a synthetic resin, wood or light metal through which the baton main body 1 is inserted.
As shown in Fig. 2, the crosshandle 2 of this embodi.-ment has a support shaft 6 extended vertically from a mounting base 5 for securing to the baton main body 1 in perpendicular to the baton main body 1 and it is consti-tuted as an upper/lower rotational type crosshandle, com-prising a relatively rotational lower member 7 rotatably put ~it around a base end 6a of the support shaft 6, an relatively rotational upper member 8 rotatably put around a top end 6b of the support shaft 6 and a statlc member 9 through which an intermediate portion 6c o~ the support sha-Pt 6 is inserted and which is secured to the support shaft 6 at a position between the relatively rotational upper and lower members 7 and 8.
The baton main body 1 has a telescopic structure comprising a plurality of (three in the illustrated em-bodiment) cylindrical members 25, 26, and 27 each of di-fferent diameter. The outer cylinder 25 of the greatest diameter has female threads 28 formed at the inner circum-2~6~3~
ferential surface on the side of the rear end being extendedfrom the opening to the inside, a plug 29 having outer circumferential threads and screwed at the inside, and a cap 30 screwed at the rear end opening as a cover. In the outer cylinder 25, the outer circumferential surface comprises a cylindrical surface 25a formed in parallel with the cylindrical axis, and an inner circumferential surface comprises an inclined surface 25d at the top end, being tapered (converged) toward the top end. An inter-mediate cylinder 26 contained at the inside of the outer cylinder 25, as an inner cylindrical member, has an inclined sur-face 26f formed to the outer surface on the rear end, and the outer diameter thereof is slightly enlarged toward the rear end opening so as to be e~gageable with the inclined surface 25d of the outer cylinder 25. The top end of the intermediate cylinder 26 has an inclined surface 26d formed to the inner circumferential sur~ace, being tapered to the top end. An inner cylinder 27 contained at ~he inslde o~ the intermediate cylinder 26 has an inclined surface 27~ to the outer surface of the rear end and the outer diameter thereof is slightly enlarged *oward the rear end opening so as to be enga~eable with the inclined surface 26d at the top end of the intermediate inner cylinder ~6. Female threads are formed at -the inner surface of the top end opening to which a cap 36 is 2~673~8 screwed. The rear end o-f the inner cylinder 27 has such an inner diameter as capable of engaging a -forked spring 38, which is screw-set to the plug 29 ~hen the guard baton is contracted. The base of the cap 36 at the top end has such a size capable o* engaging the top end o-f the inter-mediate cylinder 26.
Referrin~ more specifically to the structure -for expansion and contraction of the baton main body 1 with reference to the enlarged cross sectional view of Fig. 3, the outer cylinder 25 as the outer cylindrical member and the intermediate cylinder 26 (an outer cylindrical member to the ~nner cyllnder 27) are shaped at their top end portions, such that each o~ their outer surfaces 25a 126a) has no inclination in the axial direction, that is, as a cyli~ldrical shape having a circumfe~rential surface in parallel with the cyllndrical axis. On the other hand, at the inner sur~ace o-f each of the top end portions, there are formed conically inclined tapered sur-faces 25d (26d) and a cylindrlcal slide guide sur~ace 25c (26c~
having a circumferential sur-face in parallel with the cylindrical a~is and conti~uous to the top end Or the conically inclined surface 25d (26d). On the other hand, each of the intermediate cylinder 26 as the inner cylindrical member (inner cylindrical member to the outer cylinder 25) and the inner cylinder 27 has, at the outer surface of the -` 2~73~8 rear end, a cylindrical slide guide surface 26e (27e) as a circumferential surface in parallel with the cylindrical axis and a conically inclined tapered surface 26f (27F) in contiguous with the slide guide surface 26e (27e), orderly from the rear end.
The slide guide surface 25c at the inner surface on the top end of the outer cylinder 25 and the cylindrical outer circumferential surfaee 26a of the intermediate cylinder 26 in parallel with the cylindrical axis are fit to each other with a slight clearance, and the slide gulde surface 26e on the outer surface at the rear end of the intermediate cylinder 26 and the cylindrical inner elrcumferential surface 25b of the outer cylinder 25 in parallel with the eylindrical axis are fit to each other with a slight clearance. Further, the slide guide surface 26e on the inner surfaee at the top end o-f the intermediate eylinder 26 and the cylindrieal outer eireumferential surface 27a of the inner cylinder 27 in parallel with the eylindrical axis are fit to each other with a slight elearanee, and the slide guide surfaee 27e on the outer surEace at the rear end of the inner eylinder 27 and the eylindrieal inner circumferential surfaee 26b of the intermediate eylinder 26 in parallel with the eylindrieal axis are fit to eaeh o-ther with a slight elearanee.
- ~.3 ~7308 At leas~ one bent hole 31 is formed to the circumfe-rential side o-~ the outer cylinder 25. Alternatively, the bent hole 31 may be disposed to the intermediate cylinder 26 or the inner cylinder 27, to the cap 30 attached to the rear end of the outer cylinder or to the cap 36 attached to the top end of the inner cylinder 27, or the hole may be replaced with a groove or slit, so long as air can flow freely between the inside and the outside of the cylindrical member of the baton main body 1 to ensure smooth extending and contracting operation.
In this embodiment, an angle o~ inclination for the conically inclined surface 25d of the outer cylinder, each of the conically inclined sur-faces 26d and 26f of the intermediate cylinder and the conical inclined surface 27-of the inner cylinder 27 is preferably within a range from 1 to 2. If the angle is smaller than 1, it requires a large force for releasing engageme:nt between each of the inclined surfaces and containing the intermediate cylinder 26 in the outer cylinder ~5 and the inner cylinder 27 in the intermediate cylinder 26, respectivel~, thereby making it difficult to contract the baton main body 1. Further, depending on the fabrication error, there may be a worry that the inner cylindrical member slips and -flies out o~
the outer cylindrical member by the swinging force upon extending the baton main body 1. On the other hand, if 2~73~
the angle of inclination is greater than 2, engagement between each of the inclined sur~aces is weakened in an extended state to bring about a worry that the engagemen-t is released by the reaction of thrusting an opponent, to contract the baton main body 1. By the way, baton main bodies 1 were experimentally manufactured with the angle o-f inclination (tapered angle) being varied to three steps, that is, 1, 1.5 and 2 and the relationship between the tensile load and the maximum compression load in the axial direction were determined. Test data are shown in Table 1.
As the test method, the manufactured main body 1 was used as a test piece, which was set to a universal material tester, applied with an axial tensile load -from the both ends, then compressed in the opposite direction, and the maximum compression load was measured. The test was entrusted to the Pre~ectural Industrial Technical Center o~ Ehime.
- 1~
2~730~
Table 1 Tensile Maximum Compression Load (Kg~) load (Kg-~) Taper 1.0 Taper 1.5Taper 2.0 400 340 315 240.
500 ~10 390 290 55~ 555 400 365 600 540 470 3~0 When the expansion and contraction type guard baton is actually used, the baton main body 1 is swung by a hand to thrust out and extend the inner cylindrical member. The extending force in this case corresponds to the tensile load shown in Table 1. Further, -~or contracting the extended baton main body 1, -the top end o~ the baton main body 1 is hit and pressed, to house the inner cylindrical member. The presslng ~orce in this case corresponds to 2~7308 the maximum compression load in Table 1. It can be seen from the table that when the inner cylindrieal member is thrusted out by a force corresponding, *or example, to 300 Kg-f of the tensile load, 260 Kgf of a force is required for contracting it in a case o~ the tapered angle of 1 but it may be reduced to a force o-f 180 Kgf in a case of the tapered angle of 2. In other words it is apparent that a greater force has to be applied for contraction if the tapered angle is smaller than 1 and that contraction is difficult af-ter the cylindrical member with a smaller tapered angle has been thrusted with a large force. On the contrary, if the tapered an~le exceeds 2, the compression load is further reduced and the inner cylindrical member is contracted after it is thrusted strongly and the functlon of the guard baton can not be attained.
Description will be made t~ t~he operation.
When a centrifugal force is applied to the baton main body 1 by gripping the crosshandle 2 or the grip A in a state where each o~ the cylinders 25, 26 and 27 is contained successi~ely in a telescopic rashion (Fig. 2), the inter-mediate cylinder 2~ and the inner cylinder 27 are thrusted out and extended. In this case, the cylindrical outer circumferential surface 26a of the intermediate cylinder 26 in parallel with the cylindrical axis is guided, being in a slight plane-to-planf~ contact, along the-slide guide 2~73~
face 25c at the top end of the outer cylinder 25, and the slide guide surface 26e at the rear end of the intermediate cylinder 26 is guided, whlle being in a slight plane-to-plane contact, along the cylindrical inner circumferential surface 25b of the outer cylinder 25 in parallel with the cylindrical axis. In the same way, the cylindrical outer circum-ferential surface 27a of the inner cylinder 27 ln parallel with the cylindrical axis is guided, while being in a slight plane-to-plane contact, along the slide guide surface 26c at the top end O-r the inner cylinder 26, and the slide gu:Lde surface 27e at the rear end of the inner cylinder 27 ls guided, while being in a slight plane-to-plane contact, along the cylindrical inner circumferential surface 26b of the intermediate cylinder 26 in parallel with the cylindrical axis. Accordingly, the intermediate cylinder 26 and the inner cylinder 27 can move extremely smoothly wlth neither rattllng nor devlation. ~urther, since the slide guide surfaces 25c, 26e, 26c and 27e are put to plane-to-plane contact with each o-ther, their abrasion is reduced extremely as compared with case of line-to-line contact in the prlor art even when the baton is put to repea-ting extending and contracting operatisn for a long period of time, the working life can be improved greatly.
When they are completely extended, the incllned surface 26f at the rear end of $he intermediate cylinder 26 thrusted 2$1~730~
out of the outer cylinder 25 engages the inclined sur~ace 25d at the top end o-f the outer cylinder 25, and the inclined surface 27f at the rear end of the inner cylinder 27 thrusted out of the intermediate cylinder 27 engages the inclined surface 26b at the top end of the intermediate cylinder 26 and they are retained from slipping o-ff.
Upon engagement, a strong impact is applied to the outer cylinder 25 as the outer cylindrical member (and the inner cylinder 26) at the inclined surface 25d (and 26d) at the top end portion, and the component o~ the force along *he inclined surface is exerted in the direction o-f opening outward. In the present invention, since the outer sur-face of the outer cylinder 25 (and the inner cylinder 26) is made cylindrlcal as far as the top end so that the wall thickness at the top end which was liable to suffer from deformation in the existent structure is locally increased, it is less de~ormed even if a large force is exerted in the direction of openin~ outward. There-~ore, if the baton main body 1 is thrusted out with a large force, it can be preven*ed from slipping off. In addition, the wall thick-ness for each of the cylindrical members can be decreased, AS a whole, to reduce the weight.
Fig. 4 shows a modi-~ied structure of the first em-bodiment, in which a guard portion 40 ls attached instead of the crosshandle to the baton main body 1. The structure 3 ~ $
for expansion and contraction of the baton main body 1 is the same as in the first embodiment.
Fig. 5 shows a portion o-~ a structure for expansion and contraction o-f -the baton main body 1 in a second embodiment of the present invention.
In this embodiment, a step 51 is formed between an inner circumferential surface 25b (26b) at the top end and the base of an inclined surface 25d (and 26d) of an outer cylinder 25 as an outer cylindrical member (and an inter-mediate cylinder 26), while another step 62 engageable with the step 51 is disposed between a slide guide sur~ace 26e (27e) and an inclined surface 26-f (27~) of the interme-diate cy~inder 26 as an inner cylindrical member (and an inner cylinder 27). This modified embodiment has a merit of providlng a -further improved ef-~ect -for preventing slipping off by the engagement of the steps 51 and 52 to each other.
Fig. 6 shows a portion o-f a third embodiment of the present invention.
In this embodiment, a ring 55 made of an abrasion resistant material and having a slide guide surface 25c (26c) is attached to the top end of an outer cylinder 25 as an outer cylindrical member (and an intermediate cylinder 26). As the abrasion resistant material, titanium alloy or like other hard metal or a synthetic resin o-~ low 2~673~
frictional resistance such as a fluoro resin is pre-ferred.
Figs. 7 and 8 show a portion for a fourth embodiment O-r the present invention.
In this embodiment, a ring 56 made of the same abrasion resistant mzterial as described above and having a slide surface guide 26e 127e) is fit to the rear end of an intermediate cylinder 26 as the inner cylindrical member ~and an inner cylinder 27) and fixed by screwing a thread-clamping ring 57. The sliding guide surface 26e (27e) is spherically protruded at a plurality of portions (four portions in the illustrated embodiment) from the outer circumferential surface of the abrasion reslstant ring 56.
Fig. 9 shows a -fifth embodiment according to the present invention, which is dlfEerent -from the fourth embodiment shown in Figs. 7 and 8 in that the slide guide sur-Eace 26e t27e) of the abrasion resistant ring 59 is formed as a cylindrical surface.
Each of the third to fi-fth embodiments has a merit capable of outstandingly impro~ing the durability by -forming the sllde guide surface with the abrasion resistant material separately from the cylindrical member.
Although not illustrated in the drawings, the inner surfaces of the outer cylinder 25 as the outer cylindrical member and the intermediate cylinder 26 and the outer sur-faces of the intermediate cylinder 26 and the inner %~73~
cylinder 27 as the inner cylindrical member may be formed with an abrasion resistant layer, for example, by applying a nitriding treatment or a coating with a titanium alloy layer, for improving the durability.
As has been described above, in the expansion and contraction type guard baton according to -the present invention, since a slide guide surface is -formed at each of the ends of the inclined surfaces of the outer cylindrical member and the adjacent inner cylindrical member along which they are engaged, in a plane-to-plane contact with the circumferential surface of the cylindrical member, lt can provide an advantageous effect of providin~
an extremely smooth e~tendlng and contracting operation and reducing abrasion at the end of the inclined surface even a~ter repeating use, thereby ~reventing rattling or dev:lation for a long period of time. Further, since the abrasion resistance of the slide guide surface and the contact surface thereof is enhanced, it can provide an effect capa~le of outstandingly improving the durability as compared ~ith the existent structure. Further, since the outer sur~ace a* the top end of the outer cylindrical member is formed cylindrically and the inner surface thereof is disposed with the conicall~ inclined surface tapered toward the top end and a cylindrical slide guide surface in contiguous to the top end of the conically inclined ~730~
surface, thereby increasing the wall thickness locally at the top end, it can provide an advantageous effect that the top end of the outer c~lindrical member is less opened upon extension, thereby preventing the inner cylindrical member from slipping off even if a strong impact is applied to the top end of the outer cylindrical member. Further, since the steps are formed at the engaging portion between the inner and the outer cylindrical members thereby restricting the angle of inelination for each of the inclined surfaces, this can provide a fur-ther improved anti-slip off effect.
In part:lcular, when the structure for expansion and eontraetion o~ the present invention is applied to a guard baton with a crosshandle, it can provide a su-fficient rigidity in the extended state of the guard baton $o attain hlgh reliability.
- ~3
Claims (8)
1. A structure for expansion and contraction of a guard baton comprising a plurality of cylindrical members each of different diameter combined in a telescopic manner, in which an inclined surface at the rear end of an inner cylindrical member is made engageable with an inclined surface at the top end of a cylindrical member Just outside thereto in an extended state, wherein the top end of said outer cylindrical member has an outer circumferential cylindrical surface in parallel with the cylindrical axis and an inner surface having a conically inclined surface tapered toward the top end and a circum-ferential cylindrical slide guide surface in contiguous with the top end of said conically inclined surface and in parallel with the cylindrical axis, and the rear end of the inner cylindrical member has an outer circumferential cylindrical slide guide surface in parallel with the cylindrical axis and a conically inclined surface tapered toward the top end and in contiguous with said slide guide surface, in which the slide guide surface of the outer cylindrical member is put to a slidable contact with the outer circumferential surface of the inner cylindrical member and the slide guide surface of the inner cylindrical member is put to a slidable contact with the inner circumferential surface of the outer cylindrical member respectively.
2. A structure for expansion and contraction of a guard baton as defined in claim 1, wherein a step is formed between the inner circumferential surface and the base of the conically inclined surface of the outer cylindrical member, and another step is formed between the slide guide surface and the conically inclined surface of the inner cylindrical member.
3. A structure for expansion and contraction of a guard baton as defined in claim 1 or 2, wherein an abrasion resistant layer is formed to the inner surface of the outer cylindrical member and the outer surface of the inner cylindrical member.
4. A structure for expansion and contraction of a guard baton as defined in any one of claims 1 to 3, wherein a ring made of an abrasion resistant material and having a slide guide surface is attached to the top end of the outer cylindrical member.
5. A structure for expansion and contraction of a guard baton as defined in any one of claims 1 to 4, wherein a ring made of an abrasion resistant material and having a slide guide surface is attached to the rear end of the inner cylindrical member.
6. A structure for expansion and contraction of a guard baton as defined in any one of claims 1 to 5, wherein the angle of inclination for each of the conical engaging surfaces of the outer cylindrical member and the inner cylindrical member is defined as within a range of 1° to 2°.
7. A structure for expansion and contraction of a guard baton as defined in any one of claims 1 to 6, wherein the guard baton is a guard baton with a crosshandle.
8. A structure for expansion and contraction of a guard baton as defined in any one of claims 1 to 7, which further comprises a vent hole being disposed to at least one position of the guard baton.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3-116,138 | 1991-05-21 | ||
| JP3116138A JPH04344098A (en) | 1991-05-21 | 1991-05-21 | Club of telescopic structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2067308A1 true CA2067308A1 (en) | 1992-11-22 |
Family
ID=14679679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002067308A Abandoned CA2067308A1 (en) | 1991-05-21 | 1992-04-27 | Structure for expansion and contraction of guard baton |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPH04344098A (en) |
| KR (1) | KR920021964A (en) |
| CN (1) | CN1067115A (en) |
| AU (1) | AU1529392A (en) |
| CA (1) | CA2067308A1 (en) |
| DE (1) | DE4216637A1 (en) |
| DK (1) | DK66092A (en) |
| FR (1) | FR2676804A1 (en) |
| GB (1) | GB2256035A (en) |
| IT (1) | IT1256835B (en) |
| NL (1) | NL9200802A (en) |
| SE (1) | SE9201559L (en) |
| ZA (1) | ZA922924B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5657986A (en) * | 1994-09-27 | 1997-08-19 | Armament Systems And Procedures, Inc. | Expandable baton with offset tapered locking zone |
| DE29516863U1 (en) * | 1995-10-25 | 1997-02-27 | Müller, Lothar, 58513 Lüdenscheid | Tonfa |
| AU4854896A (en) * | 1996-01-16 | 1997-08-11 | Armament Systems And Procedures, Inc. | Expandable baton with sections made of dissimilar materials and method of making same |
| WO2000003191A2 (en) * | 1998-07-13 | 2000-01-20 | Michael Lupton Associates Ltd. | Batons |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3371930A (en) * | 1965-10-06 | 1968-03-05 | Shiga Yoshio | Extensible night stick |
| US3554546A (en) * | 1968-09-06 | 1971-01-12 | Harold N Brauhut | Spring whip |
| US4037839A (en) * | 1975-12-31 | 1977-07-26 | Nelson Norman C | Collapsible baton |
| US4135719A (en) * | 1977-07-20 | 1979-01-23 | Braunhut Harold N | Spring whip |
| US4533140A (en) * | 1983-04-01 | 1985-08-06 | Champion Preston L | Animal deterrent device for joggers |
| US4752072A (en) * | 1986-12-22 | 1988-06-21 | Parsons Kevin L | Telescoping self-defense keychain |
| US4819137A (en) * | 1987-02-05 | 1989-04-04 | Hamilton Robert J | Multi-purpose self defense apparatus |
| US4964636A (en) * | 1988-02-23 | 1990-10-23 | Hideyuki Ashihara | Police baton with rotatable crosshandle |
| JPH0240499A (en) * | 1988-07-29 | 1990-02-09 | Hideyuki Ashihara | Truncheon |
| JPH02147076A (en) * | 1988-08-22 | 1990-06-06 | Hideyuki Ashihara | Self-defending equipment |
| JPH0452500A (en) * | 1990-06-20 | 1992-02-20 | Hideyuki Ashihara | Policeman's club with cross handle |
| AU8277191A (en) * | 1990-09-05 | 1992-06-04 | Hideyuki Ashihara | Multi-functional police baton |
-
1991
- 1991-05-21 JP JP3116138A patent/JPH04344098A/en active Pending
-
1992
- 1992-04-23 ZA ZA922924A patent/ZA922924B/en unknown
- 1992-04-27 CA CA002067308A patent/CA2067308A1/en not_active Abandoned
- 1992-04-30 AU AU15293/92A patent/AU1529392A/en not_active Abandoned
- 1992-05-02 KR KR1019920007537A patent/KR920021964A/en not_active Application Discontinuation
- 1992-05-05 NL NL9200802A patent/NL9200802A/en not_active Application Discontinuation
- 1992-05-20 DE DE4216637A patent/DE4216637A1/en not_active Ceased
- 1992-05-20 FR FR9206137A patent/FR2676804A1/en active Pending
- 1992-05-20 IT ITTO920433A patent/IT1256835B/en active IP Right Grant
- 1992-05-20 DK DK066092A patent/DK66092A/en not_active Application Discontinuation
- 1992-05-20 CN CN92103248A patent/CN1067115A/en active Pending
- 1992-05-21 GB GB9210807A patent/GB2256035A/en not_active Withdrawn
- 1992-05-21 SE SE9201559A patent/SE9201559L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| AU1529392A (en) | 1992-12-03 |
| JPH04344098A (en) | 1992-11-30 |
| ZA922924B (en) | 1993-08-27 |
| ITTO920433A0 (en) | 1992-05-20 |
| DK66092D0 (en) | 1992-05-20 |
| SE9201559D0 (en) | 1992-05-18 |
| GB9210807D0 (en) | 1992-07-08 |
| CN1067115A (en) | 1992-12-16 |
| DK66092A (en) | 1992-11-22 |
| GB2256035A (en) | 1992-11-25 |
| SE9201559L (en) | 1992-11-22 |
| DE4216637A1 (en) | 1992-11-26 |
| KR920021964A (en) | 1992-12-19 |
| FR2676804A1 (en) | 1992-11-27 |
| IT1256835B (en) | 1995-12-21 |
| NL9200802A (en) | 1992-12-16 |
| ITTO920433A1 (en) | 1993-11-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |