CN101446176B

CN101446176B - Collapsible ladder

Info

Publication number: CN101446176B
Application number: CN2008101638885A
Authority: CN
Inventors: 王万兴
Original assignee: 王万兴
Current assignee: NINGBO XINGFU TOOLS CO., LTD.
Priority date: 2008-12-23
Filing date: 2008-12-23
Publication date: 2011-06-29
Anticipated expiration: 2028-12-23
Also published as: CN101446176A

Abstract

The invention discloses a collapsible ladder comprising two ladder beds which can stand opposingly to form the shape of an inverted Y, each ladder bed comprises two vertical poles and a plurality of crosspieces articulated between the two vertical poles, a positioning connecting rod is respectively arranged between the two vertical columns of each ladder bed standing opposingly in the two ladder beds, a pair of supporting rods which are distributed in the shape of an inverted V, are arranged below each crosspiece, the first end of each supporting rod is articulated with the corresponding crosspiece, the second end of each can be arranged on the corresponding vertical pole by the way of up and down limited movement along the corresponding vertical pole, furthermore, a locking mechanism is further respectively arranged on the second ends with at least one pair of supporting rods. Compared with the prior art, the collapsible ladder leads each crosspiece to be evenly supported by the supporting rods, thereby greatly improving the loading weight of the ladder, leading the supporting rods to be positioned relative to the vertical poles by the locking mechanisms, further leading the supporting rods and the crosspieces not to be moved arbitrarily, increasing the safety and the reliability of the ladder and having simple operation.

Description

A kind of Collapsible ladder

Technical field

The present invention relates to a kind of ladder, relate in particular to a kind of Collapsible ladder.

Background technology

At present, in building, finishing, in the every profession and trades such as advertisement, general a kind of Collapsible ladder of Shi Yonging, include two pairs and can oppose into lambdoid ladder, every secondary ladder comprises two vertical rods and is erected at two crosspieces between the vertical rod, wherein, vertical rod in the two secondary ladders is rotating being hinged together at the top, and in two secondary ladders, be in and respectively be provided with a location connecting rod between two vertical rods of opposition, this positioning linkage rod is divided into two joints and is hinged together at the middle part, this positioning linkage rod makes two auxiliary pole Zhang Lihou, form " A " font ladder of firmly surely establishing, this moment, people got final product the ascending stair operation, two auxiliary pole foldings of opposition can be formed long rectangle ladder and amount to this positioning linkage rod.At this moment, though people can carry and carry at this point, but this only folding ladder of folding positioning linkage rod, folding back ladder still is the long rectangle ladder of a width of cloth in shape, crosspiece between i.e. two vertical rods and the vertical rod still keeps original state, and it is still very big to take up space, and a dead lift lifts inadequately smoothly, relatively heavier, it is more to cause actual carrying to collide with.

Therefore, some can with all crosspieces all folding get up and the folding ladder hidden in the section bar into the column place is invented, be that the Chinese utility model application " foldable ladder " of ZL01263956.7 (notification number is CN2498317Y) discloses so a kind of ladder as the patent No..This foldable ladder comprises main terraced bar, main terraced boom end links to each other by the hinge joint of main hinge joint key, main terraced bar sidepiece is hinged to make main terraced bar draw or be the collapsible hinge of herringbone expansion in, main terraced bar, main hinge joint key and collapsible hinge constitute " A " font main ladder support upon deployment, between the terraced bar of corresponding master on the two secondary main ladder supports, link pedal, pedal is divided into two joints, and links to each other by hinged key; Also link support bar between the terraced bar of corresponding master on the two secondary main ladder supports, link to each other by hinged key between the support bar, the length of support bar is greater than the arbitrary joint in the pedal; One connecting rod passes hinged key on the pedal and the hinged key on the support bar, serial connection pedal and support bar, and in the hinged key and the hinged key on the support bar on the described pedal, one of them can make relative sliding motion along connecting rod at least.This foldable ladder is by being connected on each crosspiece and the connecting rod of crosspiece supported underneath masthead portion up and down, and crosspiece and support bar is folding and hide and become owner of in the section bar of terraced bar, is implemented in folding on the width, can draw into a microscler cylinder at last in.This shows that the connecting rod between main terraced bar is absolutely necessary, in actual use, the connecting rod that is connected each crosspiece central authorities causes easily mixes pin, brings many inconvenience to use, if climbing is unstable, just very easily appearance is dangerous, uses safety inadequately; And after the user stand on the crosspiece, all power all is applied on two support bars being positioned at that crosspiece below is that " eight " word distributes and both sides master ladder bar conflict by connecting rod, and only rely on the support of two support bars, the bearing capacity of its ladder is subjected to very big restriction, and, each crosspiece differs from the support bar distance, makes the bearing capacity of each crosspiece all inconsistent, and this just makes the use of ladder reliable inadequately, firm, safety; Another open defect that this foldable ladder exists, be exactly that this ladder is when being in user mode launching fully, any one parts in connecting rod wherein, support bar and the crosspiece, just can make parts activity folding if run into the external force that direction makes progress, also be, ladder is in the unlock state that can arbitrarily become flexible, there is bigger unsafe factor, this foldable ladder is when reality is used, especially in building and finishing field, situations such as the civil structure on the house drops, falls down to the ground happen occasionally, and make the people who stands on the crosspiece be in unsafe condition.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of structure design reliable, the convenient comfortable Collapsible ladder of use as safe as a house at above-mentioned prior art present situation, its each crosspiece all is subjected to the support of support bar equably, improved the bearing capacity of ladder greatly, and, can be with support bar, the opposed rod lock of crosspiece, thereby make support bar, the crosspiece all can not voluntary activity, and increase the security reliability of ladder.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: this Collapsible ladder, include two pairs and can oppose into lambdoid ladder, every secondary ladder comprises two vertical rods and is hinged on a plurality of crosspieces between two vertical rods, wherein, every vertical rod is provided with opening towards crosspiece and the groove that adapts with the crosspiece width, every vertical rod is provided with the articulated section at the top and is hinged together with corresponding vertical rod, in two secondary ladders, be in and respectively be provided with a location connecting rod between two vertical rods of opposition, this positioning linkage rod is divided into two joints and is hinged together, and, each crosspiece also is divided into two joints and is hinged together by articulated elements, it is characterized in that: the support bar that is provided with " eight " font distribution of a pair of being under each crosspiece, first end of every support bar is hinged with corresponding crosspiece, second end is being arranged in the corresponding vertical rod along the moving mode of corresponding vertical rod bound displacement, every vertical rod is provided with second end with at least one pair of support bar in every secondary ladder and carries out a plurality of lug bosses to lower limit, and, have at least in every secondary ladder also to be provided with a locking mechanism with the relative vertical rod of second end location of this support bar on second end of pair of support rods;

Second end of described every support bar can be in the following way along the moving set-up mode of corresponding vertical rod bound displacement: every vertical rod offers dovetail groove in the bottom portion of groove position, second end of every support bar be plugged in corresponding vertical rod on slide plate in the dovetail groove be hinged, and a plurality of lug bosses in the described vertical rod just are separately positioned on the spacing position, below of each slide plate.

Wherein, with positioning linkage rod and crosspiece is the two joint designs that the middle part is hinged together, all can manually positioning linkage rod and each crosspiece be bent at the middle part and upwards mention, like this, two joint sub-units of two joint sub-units of positioning linkage rod and each crosspiece all are folded into vertical folding state gradually by original located lateral state, two joint portions until each crosspiece all are collected in the groove of corresponding vertical rod, realize ladder folding on width, but the column that last ladder folding becomes one or four vertical rods to close up mutually.

The set-up mode that second end of described every support bar can move up and down along corresponding vertical rod, can adopt existing various technology, such as, second end of every support bar can be inserted with latch, and in the chute that the two ends inserting of latch is offered on the groove two side of corresponding vertical rod; But for making apparatus structure simpler, and make every support bar the relative vertical rod of second end move up and down more suitable sliding, reliable, second end that can effectively prevent support bar can accident not deviate from outside the vertical rod, can be in the following way: every vertical rod offers dovetail groove in the bottom portion of groove position, second end of every support bar be plugged in corresponding vertical rod on slide plate in the dovetail groove be hinged, and a plurality of lug bosses in the described vertical rod just are separately positioned on the spacing position, below of each slide plate; Like this, the limit shift position of each slide plate below all is provided with lug boss, and makes slide plate and be hinged on spacing that support bar second end on the corresponding slide plate is all moved down.

For making near second end of the support bar of same vertical rod relative to the moving more synchronously, stablize of vertical rod, can also be provided with a trace in the dovetail groove in every vertical rod, every trace links to each other with all slide plate that is arranged in same vertical rod.

For making two joint crosspiece transition along sliding, make things convenient for the user to trample in the crosspiece junction, described articulated elements can be the jointed shaft that covers a little rebound of two joint crosspiece junctions and pass this little rebound.

Be convenient and use, prevent that locking mechanism from mixing pin, described locking mechanism be arranged on bottommost that on second end of support bar for good.

Described locking mechanism can adopt existing various technology, but for making apparatus structure simpler, and be easy to the concrete operations of locking mechanism, described locking mechanism can include " Λ " shape securing rod of a pair of being, a linked block and a pull bar, wherein, first end of two securing rods is hinged on the both sides of second end of corresponding support bar respectively, second end of two securing rods and first end of linked block are hinged, and first end of second end of linked block and pull bar is equipped with same bearing pin and be hinged in the corresponding vertical rod, and second end of pull bar is a handle.

This locking mechanism is by being " Λ " shape securing rod, linked block, lug boss cooperates in pull bar and slide plate and the vertical rod, make slide plate bottom conflict in the vertical rod lug boss and be subjected to when lower limit, press down the handle on the pull bar, suppose to look up from side, heart location definition is an A among the connecting axle of securing rod second end and linked block first end, the center of bearing pin is defined as a B, heart location definition is a C among the connecting axle of securing rod first end and slide plate, this locking mechanism is the requirement that distance that the relative position with three axles is designed to loca and point satisfies AB+CB＞AC, second end of securing rod and first end of linked block just under the pressure of pull bar are center rotate (promptly putting A rotates around a B) with the bearing pin, when slide plate and lug boss are conflicted and can't move down the time, first end of securing rod can't move down because of being connected also with slide plate, at last, under the continuation effect of pull bar pressure, suitable elastic deformation can take place in securing rod, make AB+CB=AC, and the critical stretch position of arrival locking mechanism, this critical stretch position is a labile state, second end of securing rod and first end of linked block can be crossed this critical stretch position immediately under the pressure of pull bar, and the groove inboard that is forced to vertical rod is pressed close to, at this moment, go by wraparound owing to can't cross critical stretch position again easily for securing rod, be in and stablize motionless lock-out state, second end of support bar and slide plate also just are in the lock state equally, can't move freely, very reliable, in the time of need unlocking state, break off with the fingers and thumb on the pull bar handle and under lift hand, second end of securing rod and first end of linked block are crossed the critical stretch position of securing rod again under the power that lifts of pull bar and wraparound is gone, first end of securing rod, second end and the slide plate of support bar just can freely move up, at this moment, just arbitrarily folding of ladder.

For making pull bar when the lock-out state, can try one's best near the groove inboard of vertical rod in its outside, so that locking mechanism is not too given prominence to outside the groove of column, described pull bar can offer a breach in the position, hinged place of first end of second end of corresponding securing rod and linked block, with the holding portion hinged place, thereby make locking mechanism under lock-out state, more docile, succinct.

Description of drawings

Compared with prior art, the invention has the advantages that: by support bar all is set under each crosspiece, make each crosspiece be subjected to equably the support of support bar, greatly improved the bearing capacity of ladder, and each crosspiece central authorities does not have other accessories, does not affect the normal use of ladder; Simultaneously, by in the support bar end locking mechanism being set, make relatively vertical rod location of support bar, thereby make support bar, the crosspiece all can not voluntary activity, increase the security reliability of ladder, structural design is very scientific and reasonable, and be simple to operate, is very suitable for actual practicality; Folding ladder of the present invention, it is all very convenient, practical to use, collect, carry transportation.

Fig. 1 is the structural representation of the embodiment of the invention;

Fig. 2 is the structural representation of the complete folded state of the embodiment of the invention;

Fig. 3 is the structural representation (having removed articulated section, top and wherein vertical rod) of single secondary ladder in the embodiment of the invention;

Fig. 4 is the A-A sectional drawing among Fig. 3;

Fig. 5 is the structural representation (being in the lock state) of locking mechanism in the embodiment of the invention;

Fig. 6 is the structural representation (being in the state of unlocking) of locking mechanism in the embodiment of the invention.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

As Fig. 1～Figure 6 shows that a preferred embodiment of the present invention.

This Collapsible ladder includes two pairs and can oppose into lambdoid ladder, and every secondary ladder comprises two vertical rods 1 and is hinged on a plurality of crosspieces 2 between two vertical rods 1;

Wherein, every vertical rod 1 is provided with articulated section 11 and is hinged together with corresponding vertical rod 1 at the top, be in two secondary ladders and respectively be provided with a location connecting rod 3 between two vertical rods 1 of opposition, this positioning linkage rod 3 is divided into two joints and is hinged together, thereby can make two secondary ladders oppose to " A " font ladder;

Every vertical rod 1 is a section bar, offer size and crosspiece 2 integral width groove 12 that adapts and the dovetail groove 13 that is arranged on groove 12 bottoms on the section bar, when assembling, the end of crosspiece 2 just is hinged on the sidewall of corresponding section bar upper groove 12, also promptly, groove 12 openings of section bar are provided with towards crosspiece 2;

Each crosspiece 2 also is divided into two joints and is hinged together by the movable folding of articulated elements ground, and in the present embodiment, this articulated elements is the jointed shaft 22 that covers a small offence cab apron 21 of two joint crosspiece junctions and pass this little rebound;

Be provided with under each crosspiece 2 and be two support bars 4 that " eight " font distributes, first end 41 of every support bar 4 is hinged with corresponding crosspiece 2, second end 42 be plugged in corresponding vertical rod 1 on dovetail groove 13 in slide plate 5 be hinged, in the present embodiment, two lug bosses 14 that directly stamped out by vertical rod 1 place section bar respectively are set below each slide plate 5, carry out spacing by lug boss 14 to moving down of second end 42 of slide plate 5 and each support bar 4, thereby second end 42 of every support bar 4 can be moved along the groove 12 bound displacements of corresponding vertical rod 1, also be provided with a trace 6 in the dovetail groove 13 in every vertical rod 1, every trace 6 all couples together all slide plates that is arranged in same vertical rod 15 respectively, move up and down synchronously, in the present embodiment, trace 6 and being connected of slide plate 5 are that inserting by aperture on the projection on the trace 6 61 and the slide plate 5 realizes;

And, on that second end 42 of bottommost, also respectively be provided with a locking mechanism 8 with second end 42 locking of support bar 4 to support bar 4, as Fig. 3, Fig. 5 and shown in Figure 6, described locking mechanism 8 comprises " Λ " shape securing rod 81 of a pair of being, a linked block 82 and a pull bar 83;

Wherein, the first end 81a of two securing rods 81 is hinged on the both sides of second end 42 of corresponding support bar 4 respectively, second end 81b of two securing rods 81 and the first end 82a of linked block 82 are hinged, and the first end 83a of second end 82b of linked block 82 and pull bar 83 is equipped with same bearing pin 84 and be hinged in the corresponding vertical rod 1, and the second end 83b of pull bar 83 is a handle;

In the present embodiment, described pull bar 83 offers a breach 83c in the position, hinged place of the first end 82a of the second end 81b of corresponding securing rod 81 and linked block 82, when locking mechanism 8 under lock-out state, breach 83c on this pull bar 83 can the holding portion hinged place and make device more succinct.

This Collapsible ladder is when concrete the use, each crosspiece 2 and positioning linkage rod 3 are launched respectively, every vertical rod 1 interior slide plate 5 and connecting rod 6 can move down with the support bar 4 second ends 42 relative vertical rods 1 of correspondence, at last, press down the pull bar 83 second end 83b in the locking mechanism 8, with locking mechanism 8 lockings, at this moment, two secondary ladders oppose into the ladder that the side is " A " font, and the user just can pass through the ladder safety work, referring to Fig. 1;

When needing folding, upwards break pull bar 83 second end 83b off with the fingers and thumb, the locking of mechanism 8 unlocks, at this moment, can manually positioning linkage rod 3 and each crosspiece 2 be bent at the middle part and upwards mention, two joint sub-units of two joint sub-units of positioning linkage rod 3 and each crosspiece 2 all are folded into vertical folding state gradually by original horizontal user mode, two joint portions until each crosspiece 2 are all hidden in the groove 12 of corresponding vertical rod 1, at this moment, the column that ladder is just become four vertical rods 1 to close up mutually by folding is referring to Fig. 2.

Claims

1. Collapsible ladder, include two pairs and can oppose into lambdoid ladder, every secondary ladder comprises two vertical rods (1) and is hinged on a plurality of crosspieces (2) between two vertical rods (1), wherein, every vertical rod (1) is provided with opening towards crosspiece (2) and the groove (12) that adapts with the crosspiece width, every vertical rod (1) is provided with articulated section (11) and is hinged together with corresponding vertical rod (1) at the top, in two secondary ladders, be in and respectively be provided with a location connecting rod (3) between two vertical rods (1) of opposition, this positioning linkage rod (3) is divided into two joints and is hinged together, and, each crosspiece (2) also is divided into two joints and is hinged together by articulated elements, it is characterized in that: the support bar (4) that is provided with " eight " font distribution of a pair of being under each crosspiece (2), first end (41) of every support bar (4) is hinged with corresponding crosspiece (2), second end (42) is being arranged in the corresponding vertical rod (1) along the moving mode of corresponding vertical rod (1) bound displacement, every vertical rod (1) is provided with second end (42) with at least one pair of support bar (4) in every secondary ladder and carries out a plurality of lug bosses (14) to lower limit, and, have at least in every secondary ladder also to be provided with one on second end (42) of pair of support rods (4) with second end (42) of this support bar (4) locking mechanism (8) of vertical rod (1) location relatively;

Second end (42) of described every support bar (4) can be in the following way along the moving set-up mode of corresponding vertical rod (1) bound displacement: every vertical rod (1) offers dovetail groove (13) at groove (12) bottom position, second end (42) of every support bar (4) slide plate (5) interior with being plugged in the last dovetail groove (13) of corresponding vertical rod (1) is hinged, and a plurality of lug bosses (14) in the described vertical rod (1) just are separately positioned on the spacing position, below of each slide plate (5).

2. Collapsible ladder according to claim 1 is characterized in that: also be provided with a trace (6) in the dovetail groove (13) in the every vertical rod (1), every trace (6) links to each other with all slide plate (5) that is arranged in same vertical rod (1).

3. Collapsible ladder according to claim 1 is characterized in that: described articulated elements is the jointed shaft (22) that covers a little rebound (21) of two joint crosspiece (2) junctions and pass this little rebound (21).

4. Collapsible ladder according to claim 1 is characterized in that: described locking mechanism (8) is arranged on that second end (42) to support bar (4) of bottommost.

5. according to the described Collapsible ladder of arbitrary claim in the claim 1 to 4, it is characterized in that: described locking mechanism (8) includes " Λ " shape securing rod of a pair of being (81), one linked block (82) and a pull bar (83), wherein, first end (81a) of two securing rods (81) is hinged on the both sides of second end (42) of corresponding support bar (4) respectively, second end (81b) of two securing rods (81) is hinged with first end (82a) of linked block (82), and first end (83a) of second end (82b) of linked block (82) and pull bar (83) is equipped with same bearing pin (84) and be hinged in the corresponding vertical rod (1), and second end (83b) of pull bar (83) is a handle.

6. Collapsible ladder according to claim 5 is characterized in that: described pull bar (83) offers a breach (83c) in the hinged place of second end (81b) of corresponding securing rod (81) and first end (82a) of linked block (82).