CN1776184A - Connection structure between column and pedal in foldable ladder - Google Patents
Connection structure between column and pedal in foldable ladder Download PDFInfo
- Publication number
- CN1776184A CN1776184A CN 200510077637 CN200510077637A CN1776184A CN 1776184 A CN1776184 A CN 1776184A CN 200510077637 CN200510077637 CN 200510077637 CN 200510077637 A CN200510077637 A CN 200510077637A CN 1776184 A CN1776184 A CN 1776184A
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- pedal
- pillar
- right sides
- structural member
- sidewall
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Abstract
The invention provides a connection structure between a support and a rung, which generates sufficient friction at a connection portion, exerts sufficient fastening force, and can positively and firmly connect between the support and the rung. The connection structure between the support (1) formed of an almost U-shaped cross-sectional shape, and the rung (2) formed of a square cylindrical shape or an almost U-shaped cross-sectional shape, of the trestle or the like, is set up by fitting each end of the rung (2) into a space defined by right and left side walls (1a, 1b) of the support (1), and connecting the support (1) and the rung (2) together by a screwing tool such as a bolt, or a rivet. Herein an interior reinforcing member (3) is firmly interposed between both right and left side walls (2a, 2b) that are located at the end of the rung (2) and adjacent to the right and left side walls (1a, 1b), respectively.
Description
Technical field
The present invention relates to close pillar in ladder, step stool, ladder, the operation post etc. and the joint construction between the pedal.
Background technology
As shown in Figure 1, for example the many pedals 2 between two pillars 1,1 are constituted the ladder shape leg body at the both ends of operation post by pair of posts 1,1 and crossbearer, each pillar 1 by section roughly コ word shape section bar constitute, chimeric between the sidewall of the left and right sides of this pillar 1 and insert by square tube shape section bar or section roughly behind the end of the pedal 2 that constitutes of コ word shape section bar, the end of this pedal 2 is connected by bolt etc.
And, as the pillar of prior art and the joint construction between the pedal, can't enumerate known documents such as patent gazette particularly, but in the joint construction that is adopted in the past, structure as shown in Figure 6 and Figure 7 be arranged.Fig. 6 (a) and (b) are represented the joint construction that forms by self-tapping screw, and wherein (a) is lateral view, (b) is the A-A sectional view of (a).This joint construction is, the end of the pedal 2 that will be made of square tube shape section bar is chimeric and insert by section roughly between left and right sides sidewall 1a, the 1b of the pillar 1 that constitutes of コ word shape section bar, and from the back side sidewall 1c of pillar 1 self-tapping screw 21 is screwed on the screw base 22 of inside of pedal 2, thereby pillar 1 and pedal 2 are coupled together.Fig. 7 represents the joint construction by rivet 23 formation, promptly, the end of the pedal 2 that will be made of square tube shape section bar is chimeric and insert by section and roughly be between left and right sides sidewall 1a, the 1b of the pillar 1 that コ word shape section bar constitutes, and with each sidewall 1a, 1b about pillar 1 and therewith sidewall 2a, the 2b of the pedal 2 of adjacency respectively by rivet 23 combinations, thereby pillar 1 and pedal 2 are coupled together.In addition, also have following joint construction, that is, and chimeric between the sidewall of the left and right sides of pillar and insert under the state of end of pedal, intert the double end connecting bolt from a sidewall of pillar across another sidewall of the two side of pedal and pillar, and carry out fastening with nut.In addition, the section that forms pillar 1 roughly is コ word shape section bar, only represented that in Fig. 6 and Fig. 7 back face wall 1c is the structure that solid wall constitutes, but this back face wall 1c can be made of also inside wall and this double wall of lateral wall.
In the joint construction of above-mentioned prior art, when connecting, can not produce enough big frictional force in the coupling part, thereby be easy to generate the absent-mindedness of screw 21 by self-tapping screw 21.In addition, when forming by rivet 23 or double end connecting bolt, if the rigidity of the sidewall of the pedal that they run through is fully big inadequately, so the fastening force of coupling part just a little less than, can not produce enough big frictional force, thereby can not obtain fixing reliably.In addition, in the joint construction that forms by rivet 23, owing to be difficult to extract rivet 23, so be not suitable for changing the situation of pedal 2 and pillar 1.
Summary of the invention
The present invention is in view of above-mentioned problem, purpose is to provide a kind of pillar in ladder etc. and joint construction between the pedal of closing, promptly, can make the coupling part produce fully big frictional force, and can guarantee fully big fastening force, thereby can reliably firmly be connected and fixed, and take place at pedal and pillar that damaged situation is inferior can be changed these parts pillar and pedal.
The reference symbol of the embodiment of chatting after additional below describes the means that solve above-mentioned problem.Promptly, technical scheme of the present invention 1 is a kind of pillar in the ladder etc. and joint construction between the pedal of closing, described joint construction is that the end of pedal 2 is chimeric and be inserted in the left and right sides sidewall 1a that closes the pillar 1 in ladder etc., between the 1b, then pillar 1 and pedal 2 are connected by be threaded type component or rivet such as bolt, pedal 2 wherein roughly is コ word shape type mechanism by square tube shape section bar or section, it is characterized in that: on the end of pedal 2 and with the left and right sides wall 1a of pillar 1, the left and right sides wall 2a of 1b adjacency, between the 2b, the inner reinforcement with structural member 3 inserted and be fixed with to folder in advance, 13; Pedal 2 roughly is コ word shape section bar by square tube shape section bar or section and constitutes; Pillar 1 roughly is コ word shape section bar by section and constitutes; The section that forms pillar 1 roughly is コ word shape section bar and is made of left and right sides sidewall 1a, 1b and back face wall 1c; Back face wall 1c is made of solid wall or inside and outside double wall.
Technical scheme of the present invention 2 is closed pillar in the ladder etc. and the joint construction between the pedal for technical scheme 1 is described, it is characterized in that: by detent mechanism inside is strengthened with structural member 3,13 positioning and fixing on assigned position.As this detent mechanism can be, when strengthening with structural member 3 when for example cartridge constitutes, with left and right sides wall 2a, the 2b of the pedal 2 of the left and right sides wall 1a of pillar 1,1b adjacency on offer porose 6,6, side is formed with inside chimeric protruding 6a, 6a respectively within it then, and make two chimeric protruding 6a, 6a insertion and be entrenched in inner the reinforcement with in the both ends of structural member 3, then this inner reinforcement is fixed between left and right sides wall 1a, the 1b of pillar 1 with structural member 3.
In addition, as detent mechanism also can be the left and right sides wall 1a that by following manner inside is strengthened being fixed on structural member 13 pillar 1, between the 1b, promptly, with the left and right sides wall 1a of pillar 1, the left and right sides wall 2a of the pedal 2 of 1b adjacency, 2b is last and respectively on the relative position of inner surface, be formed with the guide-track groove 8 that extends along the pedal long side direction, 8, and at two guide-track grooves 8, the chimeric sliding freely both ends that inner reinforcement is arranged with structural member 13 in 8, this inner reinforcement is bearing on the diapire 1c inner surface of pillar 1 with a side end 13a of structural member 13, and end side 13 is bearing in has cut sheet 9, on 9, cut sheet 9,9 are separately positioned on the left and right sides wall 2a of pedal 2, on the 2b, and respectively to projecting inward; The inner reinforcement supported by the sheet 9 of cutting as described above with both side ends 13a, the 13b of structural member 13.
In addition, detent mechanism as other also can be: do not use its sheet 9 of cutting as described above, and on the left and right sides of pedal 2 wall 2a, 2b, form to projecting inward protuberance by punch process or by tubular rivet (blind rivet) respectively, and will strengthen with structural member 3,13 positioning and fixing on assigned position by this protuberance.
The reference symbol of the embodiment of chatting after additional below describes the invention effect that forms by above-mentioned settling mode.Promptly, according to technical scheme 1 of the present invention, by on the end of pedal 2 and with the left and right sides wall 1a of pillar 1, the left and right sides wall 2a of 1b adjacency, folder is inserted with inner the reinforcement with structural member 3 between the 2b, 13, make left and right sides wall 2a, 2b becomes the rigid body structure, so for example from a sidewall 1a of pillar 1 two side 2a across pedal 2, another sidewall 1b of 2b and pillar 1 and the bolt 4 that interts, and the nut 5 and when fastening on its end, screwed on, though perhaps in embodiment, do not carry out illustration, but at sidewall 1a with pillar 1, the 1b and the sidewall 2a of the pedal 2 of adjacency therewith, 2b carry out screw in conjunction with or rivet in conjunction with the time, because the sidewall 1a of pillar 1,1b is able to fastening fully respectively and is crimped on the sidewall 2a of the pedal 2 that is adjacent, on the 2b, so sidewall 1a at pillar 1, the sidewall 2a of 1b and pedal 2, to produce fully big frictional force between the 2b respectively, thereby can securely pillar 1 and pedal 2 be linked together.
In addition, under the situation of the joint construction that passes through bolt 4, nut 5 formation, when needing replacing when pedal 2 generation breakages, its replacing operation becomes and is easy to.And, under the situation of the joint construction that forms by rivet, when needs are changed pedal 2, even because to riveting processing again after the coupling part place under repair processing, sidewall 2a, the 2b of pedal 2 also can strengthen keeping fully big rigidity with structural member 3 by inside, so can change.
In addition, because inner the reinforcement will be fixed on the assigned position between left and right sides wall 2a, the 2b of pedal 2 with structural member 3, even so be at pillar 1 and pedal 2 under the state (not inserting bolt etc. state) of interim assembling, the inner reinforcement can not moved in pedal 2 or come off with structural member 3 yet, thereby carries out assembling operation easily.In this case, if want inside is strengthened being temporarily fixed on the assigned position with structural member 3, can fix by the frictional force between left and right sides wall 2a, the 2b of itself and pedal 2 so.
According to technical scheme 2 of the present invention, positioning and fixing is under the situation on the assigned position inside being strengthened using structural member 3,13 pass through detent mechanism, and the assembling operation between pillar 1 and the pedal 2 becomes and is more prone to, thereby improves operation.
Description of drawings
Fig. 1 is the lateral view with operation post of the joint construction between pillar and the pedal of the present invention.
(a) is the amplification view of the part shown in the usefulness arrow A of Fig. 1 among Fig. 2, represents an embodiment of the joint construction between pillar of the present invention and the pedal, and (b) the expression pillar is connected preceding state with pedal.
(a) is the sectional view with the almost same joint construction of the joint construction shown in Fig. 2 (a) among Fig. 3, expression is strengthened inside to be fixed on another embodiment on the end assigned position of pedal with structural member, (b) the expression pillar preceding state that is connected with pedal.
(a) is the end view drawing of the pedal of embodiment shown in Figure 2 among Fig. 4, (b) is the lateral view of this pedal.
(a) is the end view drawing of the pedal of embodiment shown in Figure 3 among Fig. 5, (b) is the lateral view of this pedal, and (c) figure with structural member is strengthened in the inside of inserting this pedal end for expression.
Fig. 6 represents the joint construction of the prior art that forms by self-tapping screw, (a) is front view, (b) is the B-B line sectional view of (a).
Fig. 7 represents the joint construction of the prior art that forms by rivet, for the same sectional view of Fig. 6 (b).
The specific embodiment
With reference to the accompanying drawings preferred implementation of the present invention is described below, Fig. 1 is the lateral view of operation post, expression is positioned at the ladder shape leg body H at both ends of operation post, this ladder shape leg body H by pair of posts 1,1 and between two pillars 1,1 the many pedals 2 of crossbearer multilayer constituted.(a) is the amplification view of the part of representing with arrow A of Fig. 1 among Fig. 2, represents an embodiment of the joint construction between pillar 1 of the present invention and the pedal 2, and (b) expression pillar 1 is connected preceding state with pedal 2.Figure as can be known thus, each pillar 1 is made of the aluminium extruded section that section roughly is コ word shape, be connected with bolt between the chimeric and end of inserting the pedal 2 that the aluminium extruded section by the square tube shape constitutes between the left and right sides of this pillar 1 sidewall 1a, 1b, the end of this pedal 2 and pillar 1.
Below pillar 1 among the ladder shape leg body H of above-mentioned operation post and the joint construction between the pedal 2 are at length described.Promptly, as Fig. 2 (b) and Fig. 4 (a), (b) shown in, on the end of pedal 2, with the left and right sides wall 1a of pillar 1, the left and right sides wall 2a of 1b adjacency, the structural member 3 of the slotting inside reinforcement of folder in advance between the 2b, by detent mechanism it is fixed then, cross over the two side 2a of pedal 2 then from a sidewall 1a of pillar 1, another sidewall 1b of 2b and pillar 1 interts bolt 4, and screw on nut 5 and carry out fastening in the protrusion end of the bolt 4 that protrudes out from sidewall 1b, by above-mentioned this mode, pillar 1 just is connected to one with the end of pedal 2.
The inner reinforcement constitutes with structural member 3, the tubing of for example stainless steel cut into the cylinder-like part of the length shorter than the summary of the interval between two side 2a, the 2b of pedal 2.As using structural member 3 positioning and fixing at the left and right sides of pedal 2 wall 2a this inner reinforcement, align member on the assigned position between the 2b, make the left and right sides wall 2a of pedal 2, assigned position folder between the 2b is established inner the reinforcement with under the state of structural member 3, at this two side 2a, have hole 6 by deburring processing respectively on the 2b, 6 and within it side form inside chimeric protruding 6a respectively, 6a, and make two chimeric protruding 6a, 6a inserts and is entrenched in inner the reinforcement with in the both ends of structural member 3, by above-mentioned this mode, as Fig. 2 (b) and Fig. 4 (a), (b) shown in, the inner left and right sides wall 2a that strengthens being fixed on pedal 2 with structural member 3, on the assigned position between the 2b.In addition, in this embodiment, cylindric is strengthened with structural member 3 as inner, but also square tube shape sheet can be strengthened with structural member 3 as inner.
According to the joint construction between such pillar 1 and the pedal 2, on the end of pedal 1, with the left and right sides wall 1a of pillar 1, the left and right sides wall 2a of 1b adjacency, folder is inserted inner the reinforcement with structural member 3 between the 2b, like this, left and right sides wall 2a, 2b becomes the rigid body structure, so make bolt from a sidewall 1a of pillar 1 two side 2a across pedal 2, after another sidewall 1b of 2b and pillar 1 interts, on its end, screw on nut 5 and carry out when fastening, the sidewall 1a of pillar 1,1b is just respectively by the fastening sidewall 2a of the pedal 2 of adjacency therewith that is crimped on fully, on the 2b, make the sidewall 1a of pillar 1 thus, the sidewall 2a of 1b and pedal 2, produce reliable frictional force between the 2b respectively, thereby can make pillar 1 and pedal 2 obtain reliable firm being connected and fixed.In addition because the joint construction of this joint construction for being undertaken by bolt, so when pedal 2 or pillar 1 damaged and when needing replacing, can be replaced with new pedal or pillar simply.
In addition, because inner the reinforcement is fixed on by detent mechanism on the assigned position between left and right sides wall 2a, the 2b of pedal 2 in advance with structural member 3, so even pillar 1 is under the state (the not state of inserting bolt 4) of interim assembling with pedal 2, the inner reinforcement can not moved in pedal 2 or come off with structural member 3 yet, thereby the assembling operation between pillar 1 and the pedal 2 becomes simple and easily, thereby improves operation.In addition, this is inner strengthens being made of cylinder-like part with structural member 3, with left and right sides wall 2a, the 2b of the pedal 2 of the left and right sides wall 1a of pillar 1,1b adjacency on have hole 6,6, form inside chimeric protruding 6a, 6b within it on the side respectively, make two chimeric protruding 6a, 6b can insert and be entrenched in inner the reinforcement with in the both ends of structural member 3, like this, the inner reinforcement is fixed on the assigned position with structural member 3.
Fig. 3 (a) is the sectional view with the almost same joint construction of the joint construction shown in Fig. 2 (a), is representing by other locate mode and inside is strengthened being fixed on another embodiment on the end assigned position of pedal 2 with structural member 3.Promptly, on pedal 2, by Fig. 5 (a) as can be known, with the left and right sides wall 1a of pillar 1, the left and right sides wall 2a of the pedal 2 of 1b adjacency, on the relative position of the inner face separately of 2b, two raised line 8a that extend along the long side direction of pedal 2, be formed with guide-track groove 8 between the 8a, and at two guide-track grooves 8, the chimeric both ends that inner reinforcement is arranged with structural member 13 on 8, slide freely on two guide-track grooves 8.8 in these both ends, and shown in Fig. 3 (a), the inner reinforcement is bearing on the back face wall 1c inner face of pillar 1 with a side end 13a of structural member 13, as Fig. 3 (a), (b) and shown in Fig. 5 (b), its end side 13b is bearing in respectively to the projecting inward left and right sides wall 2a that is arranged on pedal 2 by making it, cut sheet 9 on the 2b, on 9, make this inner left and right sides wall 1a that strengthens being fixed on pillar 1 with structural member 13, between the 1b.
Shown in Fig. 5 (c), the inner reinforcement with structural member 13, be to be that the aluminium extruded section of long rectangle constitutes by the cross section, its thickness t forms thinlyyer a little than the groove width of guide-track groove 8, and be formed with the hollow part 10 that is provided with in order to realize light-weighted purpose this inner reinforcement with a side end 13a side of structural member 13, and be formed with the hollow part 11 that interspersed bolt is used at end side 13b.
When connecting struts 1 and pedal 2, on the left and right sides of pedal 2 wall 2a, 2b, form two guide- track grooves 8,8 relatively, in this two guide-track groove 8.8 under the state of chimeric inner reinforcement with the both ends of structural member 13, this inner reinforcement is configured in the end of pedal 2 with structural member 13, and make a side end 13a side be positioned at the open end side of pedal 2, and end side 13b side bearing is being cut on the sheet 9,9, make it become state shown in Fig. 5 (b).Under this state, by bolt 4 is interted with hollow part 11 with the interspersed bolt of structural member 13 across the bolt inserting hole 7,7 of left and right sides sidewall 1a, the 1b of pillar 1 and the bolt inserting hole 12,12 and inner reinforcement that are arranged on left and right sides sidewall 2a, the 2b of pedal 2, and the nut 5 of screwing on its interspersed end carries out fasteningly, and the pillar 1 and the end of pedal 2 are reliably firmly linked into an integrated entity.
The joint construction of the embodiment that illustrates by Fig. 2～Fig. 5 is, make bolt 4 from a sidewall 1a of pillar 1 two side 2a across pedal 2, another sidewall 1b of 2b and pillar 1 and interting, and screw on nut and carry out fastening bolt connection structure in the protrusion end of the bolt 4 that protrudes out from its another sidewall 1b, but being connected between pillar 1 of the present invention and the pedal 2, be not limited to the joint construction that forms by such bolt 4 and nut 5, also can be sidewall 1a with pillar 1, the 1b and the sidewall 2a of the pedal 2 of adjacency therewith, 2b directly carries out combination with screw, perhaps the structure that engages of rivet.As screws the time or during riveted joint, by pressing from both sides slotting inner the reinforcement on the end of pedal 2 and between left and right sides wall 2a, 2b with structural member 3, sidewall 1a, the 1b of pillar 1 just will be respectively by on fastening sidewall 2a, the 2b that is crimped on the pedal 2 that is adjacent fully, between sidewall 2a, the 2b of sidewall 1a, the 1b of pillar 1 and pedal 2, just produce sufficient frictional force thus respectively, thereby pillar 1 and pedal 2 firmly can be linked together.And, even under the situation of the joint construction that forms by rivet, when needs are changed pedal 2, after being processed, the coupling part place under repair rivets again, sidewall 2a, the 2b of pedal 2 also can strengthen keeping sufficient rigidity with structural member 3 by inside, so can change.
In addition, in the above-described embodiment, by detent mechanism inside is strengthened being fixed on the assigned position with structural member 3,13, even but do not use detent mechanism, also can by and left and right sides wall 2a, the 2b of pedal 2 between contact friction force inner the reinforcement is fixed on the assigned position with structural member 3.
In addition, as locate mode, in the above-described embodiment, when strengthening constituting by cartridge with structural member 3, with left and right sides wall 2a, the 2b of the pedal 2 of the left and right sides wall 1a of pillar 1,1b adjacency on offer porose 6,6 after, be formed with inside chimeric protruding 6a, 6a within it on the side respectively, and two chimeric protruding 6a, 6a are inserted be entrenched in inner the reinforcement this inner reinforcement can be fixed between left and right sides wall 1a, the 1b of pillar 1 with structural member 3 with after in the both ends of structural member 3; Described in addition as other detent mechanism, with the left and right sides wall 1a of pillar 1, the left and right sides wall 2a of the pedal 2 of 1b adjacency, on the 2b, and on the relative position of inner face separately, be formed with the guide-track groove 8 that extends along the pedal long side direction, 8, at two guide-track grooves 8, the chimeric sliding freely inner both ends of strengthening with structural member 13 in 8, this inner reinforcement is bearing on the diapire 1c inner face of pillar 1 with a side end 13a of structural member, make its end side 13b supporting cut sheet 9, on 9, this has cut sheet 9.9 at the left and right sides wall 2a that inwardly is arranged on pedal 2 respectively projectedly, on the 2b, by the way inside is strengthened being fixed on structural member 13 left and right sides wall 1a of pillar 1, between the 1b.But be not limited to above-mentioned these locate modes, can use other multiple locate mode.The inner reinforcement supported by the sheet 9 of having cut as described above with structural member, in addition, also can replace the sheet 9 of having cut as described above, to be formed on left and right sides wall 2a, the 2b of pedal 2 by punch process or by riveted joint blind rivet (the blind rivet riveting is gone on sidewall 2a, the 2b) to projecting inward protuberance respectively, and will strengthen locating and being fixed on the assigned position with structural member 3,13 by this protuberance.
Claims (2)
1. one kind is closed pillar in ladder etc. and the joint construction between the pedal, described joint construction is that the end of pedal is chimeric and be inserted in to close in ladder etc. by section and roughly be between the left and right sides sidewall of the pillar that コ word shape section bar constitutes, then pillar and pedal are connected by be threaded type component or rivet such as bolt, pedal wherein roughly is コ word shape type mechanism by square tube shape section bar or section, it is characterized in that:
On the end of pedal and and the left and right sides wall of the left and right sides wall 1a of pillar, 1b adjacency between, the inner structural member of strengthening using is inserted and be fixed with to folder in advance;
2. pillar in the ladder etc. and the joint construction between the pedal of closing according to claim 1 is characterized in that: by detent mechanism inside is strengthened with the structural member positioning and fixing on assigned position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP334699/2004 | 2004-11-18 | ||
| JP2004334699A JP4037402B2 (en) | 2004-11-18 | 2004-11-18 | Joining structure of strut and pedestal in stepladder etc. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1776184A true CN1776184A (en) | 2006-05-24 |
Family
ID=36624366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510077637 Pending CN1776184A (en) | 2004-11-18 | 2005-06-17 | Connection structure between column and pedal in foldable ladder |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4037402B2 (en) |
| CN (1) | CN1776184A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4779917B2 (en) * | 2006-09-29 | 2011-09-28 | パナソニック株式会社 | Gas laser oscillator |
| CN102476699B (en) * | 2010-11-26 | 2015-05-13 | 大连船舶重工集团有限公司 | Detachable-step thin lower inclined surface ladder stand |
| JP2013087490A (en) * | 2011-10-18 | 2013-05-13 | Yasuaki Ueno | Four-leg height adjustable stepladder |
-
2004
- 2004-11-18 JP JP2004334699A patent/JP4037402B2/en not_active Expired - Fee Related
-
2005
- 2005-06-17 CN CN 200510077637 patent/CN1776184A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006144358A (en) | 2006-06-08 |
| JP4037402B2 (en) | 2008-01-23 |
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| PB01 | Publication | ||
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Application publication date: 20060524 |