CN201246097Y

CN201246097Y - Locking mechanism for telescopic ladder

Info

Publication number: CN201246097Y
Application number: CNU2008201631487U
Authority: CN
Inventors: 王万兴
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-19
Filing date: 2008-08-19
Publication date: 2009-05-27
Anticipated expiration: 2018-08-19

Abstract

A locking mechanism for a telescopic ladder comprises a connecting sleeve (3) used for connecting a bar section (1) and a corresponding rail (2); a bolt (4) is arranged in the connecting sleeve (3) and can transversely move relative to the rail (2); a spring (5) which causes the bolt (4) to keep exposing out of the side part of the rail (2) is arranged in the connecting sleeve (3); a control button (6) which drives the bolt (4) to transversely move is further arranged on the connecting sleeve (3); the control button (6) is provided with a driving rod (61) and an operating lever (62) connected with the driving rod (61); the operating lever (62) exposes out of the rail (2); the driving rod (62) passes through the rail (2) to enter the connecting sleeve (3), and can rotate relative to the connecting sleeve (3); a gear part (7) is arranged on the driving rod (61); and the bolt (4) is provided with a rack part (4) meshed in a driving manner with the gear part (7). The locking mechanism uses gear and rack driving to replace the traditional direct pushing; and besides, the operating lever is substantially perpendicular to the driving rod, so that according to the lever principle, the operation of controlling the operating lever to drive the bolt saves more labor.

Description

A kind of locking mechanism that is used for extension ladder

Technical field

The utility model relates to a kind of including somely can slide and mutually nested together the extension ladder of terraced bar particularly a kind of locking mechanism that is used for extension ladder relatively.

Background technology

When maintenance or maintenance task take place for dwelling house, apartment, farm, factory and other places, often need the use ladder.Ladder must be covered up obsolete the time somewhere.Long ladder can allow people arrive higher height, but but is not easy to carry and can takies more space in collection.And telescopic ladder just can extend ladder in use, and when collection ladder is folded up.

Patent documentation about extension ladder has much at present, have No. one for the U.S. Patent Publication of US7048094 a kind of safe extension ladder easy to use like this, this ladder comprises: the first terraced bar, the second terraced bar and extend in the first terraced bar and the second terraced bar between some crosspieces; The first terraced bar includes first pole and second pole, and this first pole includes an inner surface, and second pole connects into the stretching structure of a relative motion along its length by the nested mode and first pole; One locking mechanism is selectively tight with the relative first segment lever lock of second pole; One button is operatively coupled on the locking mechanism, is used to control this locking mechanism; This patent is characterised in that, described button is arranged on the position near first pole, and have one can with the suitable recess of thumb finger tip size, the thumb finger tip is placed in this recess and can promotes button and cancel the locking of locking mechanism to second pole along the direction from first pole toward second pole; One sleeve pipe is set on the external surface of second pole; This sleeve pipe has and the contacted outer spigot surface of the inner surface of first pole.

This extension ladder has the locking mechanism of a band push button, is a kind of extension ladder latch-up structure with push button the Chinese utility model patent " extension ladder " of ZL200620141000.4 (notification number is CN200985735Y) has disclosed as a patent No. also.

The locking mechanism of band push button is a common locking mechanism that is used for extension ladder, and this locking mechanism has the better simply relatively advantage of structure, but there is the defective of operation effort in it.

In sum, the aforementioned locking mechanism that is used for extension ladder also can be further improved.

The utility model content

Technical problem to be solved in the utility model is the locking mechanism that is used for extension ladder that a kind of rapid operation, novel structure are provided at above-mentioned prior art present situation.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: a kind of locking mechanism that is used for extension ladder, comprise the adapter sleeve that is used to connect pole and corresponding crosspiece, be provided with in the adapter sleeve and corresponding two joint joint bars can be plugged the latch that locks together, this latch can move also relative to the crosspiece horizontal cross can stretch out the crosspiece sidepiece, be provided with the spring that latch is remained expose outside crosspiece sidepiece trend in the described adapter sleeve, also be provided with on the described adapter sleeve and drive the control knob that latch laterally moves, it is characterized in that: described control knob is a turn-button, this control knob has a drive link and an action bars that links to each other with drive link, described action bars exposes outside crosspiece, described drive link passes crosspiece and enters in the adapter sleeve and can rotate relative to adapter sleeve, this drive link is provided with gear part, has the tooth-strip part with described gear part transmission engagement on the described latch.

Above-mentioned gear part and drive link are the split part, and described gear part is set on the drive link and can rotates with drive link, can simplify the pole of control knob like this, is convenient to assemble this control knob simultaneously.Because the distance that latch need move is shorter, therefore gear part only need be rotated a low-angle latch is given up the throne, remove its locking to corresponding two poles, both sides have the shelves limit that cooperates with crosspiece inwall gear on the described gear part, the shelves limit also can be to overhanging position-limiting action of latch simultaneously, can control the amplitude that latch moves, certainly also can adopt existing other similar structures to the qualification of latch, as retaining wall before and after can in adapter sleeve, being provided with, the corresponding back-up ring that cooperates with the retaining wall gear that on latch, is fixed with.

Have a square opening that wears for drive link on the above-mentioned gear part, correspondence, described drive link cross section be with square opening match square.This structure can guarantee that not only gear part rotates with drive link, and the mode of pegging graft also is convenient to gear part is connected on the drive link, the also porose square opening that is not limited to, also can be as triangle, polygonal hole, the cross section of drive link is done corresponding change and is got final product, and can directly gear part be fixed on the drive link in addition.

At latch corresponding two joint joint bars are plugged under the state of locking, described action bars vertically up.Action bars vertically can be avoided maloperation up, if under this state, action bars is in level, work as the user like that and climb this extension ladder, its heel of the footwear that the user wears easily touches action bars, causes extension ladder to shrink under the state being not suitable for, and causes unnecessary danger.

For ease of the operation control knob, above-mentioned action bars sidepiece has the thumb finger tip of the recess of a suitable dimension with ccontaining hand.

Above-mentioned adapter sleeve one side has annular surface, and this annular surface forms the socket with the pole socket, has the through hole that passes and connect with described socket for latch on the socket wall; The opposite side of adapter sleeve has the insertion section of pegging graft with crosspiece, has cavity on the insertion section, described drive link, and latch, gear of the spring portion all are positioned at this cavity.It is the conventional structure of adapter sleeve, and it can conveniently be connected to crosspiece and pole on this adapter sleeve.

For ease of settling spring, also be provided with a spring base in the cavity of above-mentioned insertion section, has containing hole on the spring base, described spring is positioned at containing hole, the rear portion of described latch then is positioned at the front portion of containing hole, described spring one end is resisted against the rear portion of latch, and the other end is resisted against on the back inwall of containing hole.

Above-mentioned spring base both sides have insert edge, correspondence, and both sides are provided with the slot that plugs for insert edge in the cavity.By the effect of insert edge and slot, can be conveniently that spring base is spacing in cavity.

Compared with prior art, advantage of the present utility model is: latch is by cog tooth-strip part transmission engagement on portion and the latch of control knob, move and drive latch, be that it passes through the rack-and-pinion transmission and replaces original direct promotion, have again, vertical substantially between action bars and the drive link, according to lever principle, the manipulation operation bar drives latch and moves more laborsaving.

Description of drawings

Fig. 1 is the perspective view of the utility model embodiment;

Fig. 2 is the sectional view of the utility model embodiment;

Fig. 3 is the three-dimensional exploded view of the utility model embodiment;

Fig. 4 is the user mode stereogram of the utility model embodiment;

Fig. 5 is the user mode sectional view of the utility model embodiment.

The specific embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

Be depicted as a preferred embodiment of the present utility model as Fig. 1～5.

A kind of locking mechanism that is used for extension ladder, comprise the adapter sleeve 3 that is used to connect pole 1 and corresponding crosspiece 2, described adapter sleeve 3 one sides have annular surface, this annular surface forms the socket 31 with pole 1 socket, this socket 31 and pole 1 upper periphery close-fitting, and can be by screw that socket 31 is fixing with pole 1, the opposite side of adapter sleeve 3 has the insertion section 32 of pegging graft with crosspiece 2, it is fixing with adapter sleeve 3 that crosspiece 2 backs are inserted in insertion section 32, has cavity 321 on the described insertion section 32.

Be provided with in the cavity 321 on adapter sleeve 3 and corresponding two joint joint bars 1 can be plugged the latch 4 that locks together, this latch 4 can move also relative to crosspiece 2 horizontal cross can stretch out crosspiece 2 sidepieces, be provided with the spring 5 that latch 4 is remained expose outside crosspiece 2 sidepiece trend in the cavity 321 of described adapter sleeve 3, on socket 31 walls, has the through hole 311 that passes and connect with described socket 31 for latch 4, have lockhole 11 on pole 1 wall that fixes with adapter sleeve 3, a last joint joint bar 1 middle part that is plugged in aforementioned pole 1 also is provided with a lockhole 12, after passing adapter sleeve 3, latch 4 enters the lockhole 11 of two poles 1 successively, in 12, with this two joints joint bar, 1 locking.

Also be provided with a spring base 8 in the cavity 321 of described insertion section, spring base 8 both sides have insert edge 82, corresponding, both sides are provided with the slot 322 that plugs for insert edge 82 in the cavity 321, spring base 8 is spacing in cavity 321 with cooperating of slot 322 by insert edge 82, has containing hole 81 on this spring base 8, described spring 5 is positioned at containing hole 81, the rear portion of described latch 4 then is positioned at the front portion of containing hole 81, described spring 5 one ends are resisted against the rear portion of latch 4, and the other end is resisted against on the back inwall of containing hole 81.

Above-mentioned these are lock mode comparatively commonly used in the existing extension ladder.

Also be provided with on the described adapter sleeve 3 and drive the control knob 6 that latch 4 laterally moves, improvement of the present utility model is, described control knob 6 is a turn-button, this control knob 6 has a drive link 61 and an action bars 62 that links to each other with drive link 61, drive

link

61 and 62 vertical connections of action bars, and action bars 62 is positioned at a side of drive link 61.

Described drive link 61 passes in the cavity 321 that crosspiece 2 enters adapter sleeve 3 and can rotate relative to adapter sleeve 3, and described action bars 62 exposes to the front portion of crosspiece 2, described drive link 61 is provided with gear part 7, has driving cog 72 on the part of this gear part 7, gear part 7 is positioned at cavity 321, gear part 7 is the split part with drive link 61, have a square opening that supplies drive link 61 to wear on the gear part 7, corresponding, described drive link 61 cross sections be with square opening match square, gear part 7 is set on the drive link 61 and can rotates with drive link 61 like this, and both sides have the shelves limit 71 that cooperates with crosspiece 2 inwall gears on the described gear part 7.Correspondingly with driving cog on the gear part 7 72 be, have on the described latch 4 with described gear part 7 on the tooth-strip part 41 of driving cog 72 transmissions engagement, will corresponding two joints save bars 1 at latch 4 and plug under the state of locking, described action bars 62 vertically up.

Described action bars 62 sidepieces have the thumb finger tip of the recess 621 of a suitable dimension with ccontaining hand.

Operating principle and the process of the utility model embodiment are as follows.

During locking, a last joint joint bar 1 is under action of gravity, move down, when moving to correct position, be that

lock hole

11,12 is positioned on the same axis on the adjacent two joint joint bars 1, latch 4 ejects under the effect of spring 5, inserts simultaneously in the

lockhole

11,12 of this two joints joint bar 1, and this two joints joint bar 1 is locked together.

During release, finger push action bars 62, action bars 62 drive drive links 61 and on gear part 7 rotate, under tooth-strip part 41 engagement on driving cog on the gear part 7 72 and the latch 4, drive the resilient rear-moving that latch 4 overcomes spring, latch 4 withdraws from the

lockhole

11,12 that two joints save bars 1, and a last joint joint bar 1 moves down under the effect of gravity, till a last joint crosspiece 2 and this crosspiece 2 are touched.

Claims

1, a kind of locking mechanism that is used for extension ladder, comprise the adapter sleeve (3) that is used to connect pole (1) and corresponding crosspiece (2), be provided with in the adapter sleeve (3) and corresponding two joint joint bars (1) can be plugged the latch (4) that locks together, this latch (4) can move also relative to crosspiece (2) horizontal cross can stretch out crosspiece (2) sidepiece, be provided with the spring (5) that latch (4) is remained expose outside crosspiece (2) sidepiece trend in the described adapter sleeve (3), also be provided with on the described adapter sleeve (3) and drive the control knob (6) that latch (4) laterally moves, it is characterized in that: described control knob (6) is a turn-button, this control knob (6) has a drive link (61) and an action bars (62) that links to each other with drive link (61), described action bars (62) exposes outside crosspiece (2), described drive link (61) passes crosspiece (2) and enters in the adapter sleeve (3) and can rotate relative to adapter sleeve (3), this drive link (61) is provided with gear part (7), has the tooth-strip part (41) with described gear part (7) transmission engagement on the described latch (4).

2, the locking mechanism that is used for extension ladder according to claim 1, it is characterized in that: described gear part (7) is the split part with drive link (61), described gear part (7) is set in drive link (61) and goes up also and can rotate with drive link (61), and described gear part (7) goes up both sides and has the shelves limit (71) that cooperates with crosspiece (2) inwall gear.

3, the locking mechanism that is used for extension ladder according to claim 2 is characterized in that: have one on the described gear part (7) for the square opening that wears of drive link (61), correspondence, described drive link (61) cross section be with square opening match square.

4, according to claim 1, the 2 or 3 described locking mechanisms that are used for extension ladder, it is characterized in that: at latch (4) corresponding two joint joint bars (1) are plugged under the state of locking, described action bars (62) vertically up.

5, the locking mechanism that is used for extension ladder according to claim 4 is characterized in that: described action bars (62) sidepiece has the thumb finger tip of the recess (621) of a suitable dimension with ccontaining hand.

6, according to claim 1, the 2 or 3 described locking mechanisms that are used for extension ladder, it is characterized in that: described adapter sleeve (3) one sides have annular surface, this annular surface forms the socket (31) with the pole socket, has the through hole (311) that passes and connect with described socket (31) for latch (4) on socket (31) wall; The opposite side of adapter sleeve (3) has the insertion section (32) of pegging graft with crosspiece (2), has cavity (321) on insertion section (32), described drive link (61), and latch (4), spring (5), gear part (7) all are positioned at this cavity (321).

7, the locking mechanism that is used for extension ladder according to claim 6, it is characterized in that: also be provided with a spring base (8) in the cavity of described insertion section (321), has containing hole (81) on the spring base (8), described spring (5) is positioned at containing hole (81), the rear portion of described latch (4) then is positioned at the front portion of containing hole (81), described spring (5) one ends are resisted against the rear portion of latch (4), and the other end is resisted against on the back inwall of containing hole (81).

8, the locking mechanism that is used for extension ladder according to claim 7 is characterized in that: described spring base (8) both sides have insert edge (82), correspondence, and the interior both sides of cavity (321) are provided with the slot (322) that plugs for insert edge.