CN202451041U

CN202451041U - Ladder and crane provided with ladder

Info

Publication number: CN202451041U
Application number: CN 201220026154
Authority: CN
Inventors: 任海燕; 林华; 章琢
Original assignee: Construction Machinery Branch of XCMG
Current assignee: Construction Machinery Branch of XCMG
Priority date: 2012-01-20
Filing date: 2012-01-20
Publication date: 2012-09-26
Anticipated expiration: 2022-01-20

Abstract

The utility model discloses a ladder and a crane and relates to the technical field of engineering machinery. The ladder and the crane solve the technical problems that existing ladders are difficult to use and transport and occupy large space. The ladder comprises supporting sides arranged on two sides, one or more trampling steps and a pedal, wherein the trampling steps are arranged between the supporting sides, the pedal is connected with the supporting sides and/or the trampling steps through a moving connecting structure, the pedal can move to a usage position and a folding position through the moving connecting structure, an extending surface of the pedal which is located at the usage position is parallel to a plane, and an extending surface of the pedal which is located at the folding position is parallel to a panel which is defined by the supporting sides. The crane comprises a structural member and the ladder, the lower bottom surface of the pedal at the usage position is abutted against the structural member, and the pedal can be in fit connection with the structural member in a detachable mode. Accordingly, the ladder and a platform can be used conveniently and the space is saved.

Description

Ladder and the crane that is provided with this ladder

Technical field

The utility model relates to technical field of engineering machinery, the crane that is specifically related to a kind of ladder and this ladder is set.

Background technology

Crawler crane is meant the truss-like jib structure crane that adopts the crawler travel chassis.Ladder is the passage that uses when the maintenance and inspection personnel get on or off the bus in the crane such as crawler crane; Usually also being provided with the passage that passes through in order to convenient for maintaining inspection personnel level on the crane promptly walks on stage; In the ladder in the past; In the space bigger position also can increase usually inclination ladder (be called for short: inclined ladder) walk on stage with cooperation, and inclined ladder and walk on stage near add guardrail.

Especially the crawler crane tonnage is increasing along with crane; The various modular constructions of crane are also increasing, and simultaneously, the passage or the platform that need to increase also get more and more; But under the less situation in space, increase ladder and the difficulty of walking on stage are increasing.

As shown in Figure 1; Existing ladder mainly is an integral solder formula ladder; This ladder is a kind of hanging inclined ladder; By inclined ladder main body 100, axle 101, clamp 102 links together, inclined ladder main body 100 comprises the support edge that is positioned at both sides and is arranged at a plurality of foot-operated step on the support edge, inclined ladder main body 100 is connected with the car body (not shown in figure 1) through axle 101.Only need pull down axle 101 during dismounting can disassemble ladder from car body.

There is following problem at least in prior art:

Existing ladder only is provided with simple foot-operated step, needs extra increase to walk on stage during use, needs during transportation to walk on stage and ladder all removes independent transportation, so the use of ladder is all cumbersome with transportation; In addition, existing ladder also exists volume bigger, the bigger defective of installing space that needs.

The utility model content

The purpose of the utility model is the crane that proposes a kind of ladder and this ladder is set, and has solved existing ladder and has had use, all cumbersome technical problem of transportation.

For realizing above-mentioned purpose, the utility model provides following technical scheme:

This ladder comprises support edge in both sides, is arranged at trampling step more than or two and trampling the pedal that step is connected through movable connection structure with said support edge and/or said between the said support edge, wherein:

Said movable connection structure be arranged at said pedal and said at least support edge and said trample step the two one of on;

Said pedal can move to use location and collapsed position through said movable connection structure;

The extended planar and the horizontal plane that are in the said pedal of use location parallel substantially, and certainly, as required, the extended planar of said pedal also can be angled with horizontal plane;

Be in collapsed position said pedal extended planar and plane parallel that said support edge is limited or coincide.

Preferably, said movable connection structure comprises and is fixedly arranged on said support edge and/or saidly tramples the pedestal on the step and be arranged at the axle between said pedestal, the said pedal, wherein:

Offer chute on the said pedal, the length direction of said chute and the extended planar of said pedal parallel;

Said axle is hinged with said pedestal, both are fixedly connected or both are integral structure;

Said chute is a through hole, and said axle runs through said chute and said pedestal; Perhaps, said chute is a groove, and said axle is embedded in the said groove away from the part of said pedestal.

Preferably, said pedal comprises plate-like body and protruding wall, and said protruding wall is fixedly connected with a side in the said plate-like body both sides or is integral structure, and said chute is opened on the said protruding wall;

And/or, also offering at least one locating hole on the said plate-like body, the axial direction of said locating hole and the extended planar of said plate-like body are perpendicular.

Preferably, said pedal comprises two said protruding walls, and two said protruding walls are symmetrically distributed on the said plate-like body, and said axle is arranged between two said protruding walls of symmetrical distribution;

And/or, also be provided with cushion pad at the said plate-like body downside of the said pedal that is in the use location;

And/or this ladder comprises two said support edges, and two said support edges lay respectively at the both sides of said ladder, and all is installed with said pedestal on every said support edge, and the said pedestal on two said support edges is symmetrically arranged;

And/or also being provided with on the said protruding wall can be transverse to the handle of this protruding wall pull.

Preferably, said axle runs through said chute, and the part that said axle extends said pedestal is interspersed with the anticreep bearing pin; And/or, all be installed with said handle on each said protruding wall.

Preferably, said pedestal is formed with limiting section away from the part of said support edge, the said pedestal at said limiting section, said limiting section place and the sliding space that said support edge limits said pedal;

And/or, be installed with the grip part on the said support edge.

Preferably, said movable connection structure is an articulated structure.

The crane that the utility model relates to comprises the ladder that structural member and the arbitrary embodiment of the utility model are provided, wherein:

The bottom surface that is in the said pedal of use location is pressed against on the said structural member, and can mate between said pedal and the said structural member with dismantling and be connected.

Preferably; Said structural member comprises first structural member and second structural member; Be installed with the positioning seat that one or more offers installing hole respectively on the said support edge of the both sides in the said ladder, be installed with the Connection Block that offers connecting hole respectively on said first structural member and said second structural member; The said support edge of the both sides of said ladder can move to use location and collapsed position, wherein:

Be on the said support edge of both sides of said ladder of use location said installing hole respectively with said first structural member and said second structural member on said Connection Block on said connecting hole coaxial;

Coaxial said installing hole and said connecting hole run through and are provided with bearing pin or offer threaded securing member.

Be on the said support edge of both sides of said ladder of collapsed position said installing hole only with said first structural member or the said second structural member said Connection Block on one of them on said connecting hole coaxial; Wherein, coaxial said installing hole and said connecting hole run through and are provided with bearing pin or offer threaded securing member.

Based on the arbitrary technical scheme in the technique scheme, the utility model embodiment can produce following technique effect at least:

Owing to be provided with pedal in the ladder that the utility model provided; Pedal both can move to the use location through movable connection structure; Can also move to collapsed position through movable connection structure, the extended planar (extended planar of plate or plate body is the maximum extension plane of plate or plate body) that is in the pedal of use location parallels with horizontal plane substantially, be in collapsed position pedal extended planar and both sides (can be two) plane parallel that the support edge limited or coincide; So when using the ladder that the utility model provided; Can pedal be moved to the use location, thus make pedal play with prior art in the identical effect of walking on stage, use ladder after; Can pedal be moved to collapsed position; So not only can reduce the pedal occupation space, and transportation the time need not the ladder and the transportation respectively of walking on stage also need not to be provided with bigger space in order to deposit ladder separately and to walk on stage; So the transportation of the utility model ladder is also more convenient, there are use, all cumbersome technical problem of transportation so solved existing ladder.

The utility model is to the crane especially crawler crane limited this situation in space that the position is higher, personnel pass through of getting on the bus; Ladder made both to have horizontal channel (walking on stage) be pedal; Have step again and promptly trample the combination ladder of step; This ladder both can be used for comparatively narrow space, single structure spare inside in the crane, also can be applied between two structural members (for example: first structural member and second structural member) in the crane.

Optimal technical scheme as the utility model; When the structural member in the crane (for example: first structural member or second structural member) is being torn open in the car process when needing separately; Can the pedal of ladder be disassembled and pedal and ladder are all moved to its collapsed position from structural member; Then with ladder wherein a side the support edge from a structural member of crane (for example: second structural member) disassemble with another structural member of crane (for example: first structural member) be fixed together; A structural member that just can ladder be fixedly connected with it thus (for example: together transportation first structural member), therefore the technical scheme that the utility model provided is compared with prior art; Ladder not only transports, uses all more quick and easy, but also has the advantage of the transportation of saving, installing space.

Description of drawings

Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:

Fig. 1 is the schematic perspective view of integral solder formula ladder in the prior art;

The master of the ladder that Fig. 2 is provided for the utility model embodiment looks sketch map;

Fig. 3 looks sketch map for the left side of ladder shown in Figure 2;

Fig. 4 is the schematic top plan view of ladder shown in Figure 2;

Fig. 5 is the schematic perspective view of ladder shown in Figure 2;

Fig. 6 moves to the floor map of collapsed position from the use location for the pedal on the ladder shown in Figure 2;

Floor map when the pedal on the ladder that Fig. 7 is provided for the utility model embodiment is in collapsed position;

Schematic perspective view when the pedal on the ladder that Fig. 8 is provided for the utility model embodiment is in collapsed position;

Be in the ladder of use location and the schematic perspective view of the position relation between the structural member in pedal and the crane thereof in the crane that Fig. 9 is provided for the utility model embodiment;

The schematic perspective view of the position relation between the structural member in the process of the crane transportation that Figure 10 is provided for the utility model embodiment in ladder and the crane.

The specific embodiment

Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.

The utility model embodiment provides a kind of crane little, that use and transport ladder all more convenient and with low cost and this ladder is set that takes up room.

Like Fig. 2, Fig. 3 and shown in Figure 4; The ladder that the utility model embodiment is provided; Comprise two (every side is not limited to one)

support edges

11,12 being positioned at both sides, be arranged at support edge 11, between 12 trample step 2 more than one or two and with

support edge

11,12 and/or trample the pedal 4 that step 2 is connected through movable connection structure 3, wherein:

Movable connection structure 3 is arranged at pedal 4 and

support edge

11,12 and trampling on the step 2 both one of them at least, is preferably to be arranged on

support edge

11,12 and the pedal 4.

Pedal 4 can through movable connection structure 3 as shown in Figure 6 move to as shown in Figures 2 and 3 the use location and like Fig. 7 and collapsed position shown in Figure 8.Be in that the extended planar (extended planar of plate or plate body is the maximum extension plane of plate or plate body) of the pedal 4 of use location is as shown in Figure 2 to parallel with horizontal plane substantially.Be in the extended planar of pedal 4 of the collapsed position plane parallel that is limited with

support edge

11,12 as shown in Figure 8 or coincide, be preferably and parallel.

Because pedal 4 both can move to the use location through movable connection structure 3 as shown in Figure 6; Can also move to collapsed position through movable connection structure 3; The extended planar and the horizontal plane that are in the pedal 4 of use location parallel substantially, be in collapsed position pedal 4 extended planar and plane parallel that

support edge

11,12 is limited or coincide, so when using the ladder that the utility model provided; Can pedal 4 be moved to the use location; Thereby make pedal 4 play with prior art in the identical effect of walking on stage, use ladder after, can pedal 4 be moved to collapsed position; So not only can reduce pedal 4 occupation space, and when transportation is also more convenient.

Comprise like Fig. 5 and movable connection structure shown in Figure 63 in the present embodiment being fixedly arranged on

support edge

11,12 and/or trampling the pedestal 31 on the step 2 and be arranged at the axle 32 between pedestal 31, the pedal 4 that pedal 4 can be installed on this axle 32 rotationally.Wherein:

One side of pedal 4 (or claiming the side) offers chute 33 as shown in Figure 2 along the bearing of trend of this pedal.Axle 32 and pedestal 31 both can pivot relative to each other, both are fixedly connected perhaps that both are integral structure, being preferably this axle can be arranged in the pedestal 31 to rotation.Chute 33 is a through hole, and axle 32 runs through chute 33 and pedestal 31, and axle 32 can rotate by the axial line around axle 32 chute 33 in, and can be in chute 33 along the length direction slip of chute 33.

Since axle as shown in Figure 2 32 can be chute 33 in around the axial line rotation of axle 32, make extended planar and the plane parallel that

support edge

11,12 is limited or the collapsed position that coincides of pedal 4 so can pedal 4 be turned to the use location around the axial line of axle 32.Simultaneously; Because axle 32 can slide by the length direction along chute 33 in chute 33; So the plane parallel that is limited when the extended planar that pedal 4 is turned to pedal 4 and support

edge

11,12 or coincide after; Plane parallel that can the edge be limited with

support edge

11,12 or being directed downwards of coinciding promote pedal 4, thereby reduce the position height of pedal 4.

Chute 33 as shown in Figure 2 also can be groove in the said structure, and at this moment, axle 32 parts away from pedestal 31 are embedded in the groove.Optional scheme is: chute 33 is included in the groove that forms in pedal 4 both sides (being protruding wall 42), and axle 32 comprises the place, two ends that is separately positioned on pedestal 31 and two axles that are complementary respectively with groove in the both sides of pedal 4.

Groove can directly be opened on the pedal 4, and groove also can be surrounded by the strip fin that is fixedly arranged on the pedal 4.This structure also can realize the function that said structure can be realized.

Certainly, movable connection structure 3 as shown in Figure 5 also can be for simple articulated structure (for example use hinge hinged), though above embodiment is not an optimal technical scheme, still within the protection domain of the utility model in the present embodiment.

Pedal 4 as shown in Figure 2 comprises plate-like body 41 and protruding wall 42 in the present embodiment; (Fig. 2 is the bottom side to protruding wall 42 with being fixedly arranged on a side in plate-like body 41 both sides; Bottom surface or bottom sides are also claimed in the bottom side) be fixedly connected or be integral structure; Chute 33 is opened on the protruding wall 42, and protruding wall 42 can be welding with plate-like body 41, also can use and offer threaded securing member (for example screw, bolt) fixed connection.

Not only manufacturing process is more simple on protruding wall 42 as shown in Figure 2, to offer chute 33, and installs also more convenient.Protruding wall 42 can working strength be superior to the material of plate-like body 41 and processes.

Also offer at least one locating hole 5 on the plate-like body 41 as shown in Figure 4 in the present embodiment, be preferably two locating holes 5, the extended planar of the axial direction of locating hole 5 and plate-like body 41 is perpendicular.

The setting of locating hole 5 makes plate-like body 41 can use bearing pin or offers threaded securing member (for example screw, bolt or screw rod) to position, and is preferably the use bearing pin.

Certainly, other location structures also can be set to replace locating hole 5 on the plate-like body 41, for example hook.

Pedal 4 as shown in Figure 2 comprises that 42, two protruding walls 42 as shown in Figure 3 of two protruding walls as shown in Figure 3 are symmetrically distributed on the plate-like body 41 in the present embodiment, and axle 32 is arranged between two protruding walls 42 of symmetrical distribution.The load ratio that the structure that is symmetrically distributed makes each protruding wall 42 and axle 32 diverse location places bear is more even, the anti-load-carrying ability and the life-span that help improving protruding wall 42.

Plate-like body 41 downsides at the pedal that is in the use location 4 in the present embodiment also are provided with cushion pad 6, and cushion pad 6 can use flexible materials such as elastomeric material, sponge to process, and also can use spring.Cushion pad 6 can be fixedly arranged on plate-like body 41 downsides and also can only connect with plate-like body 41 downsides.

Cushion pad 6 can reduce the impact force between pedal 4 and the structural member 8 when pedal 4 is fixed in external structure part 8, thereby avoids pedal 4 and structural member 8 to damage.

The

support edge

11,12 that is positioned at the ladder both sides in the present embodiment is that two support edges are that 12, two support edges in support edge 11 and

support edge

11,12 all are installed with pedestal as shown in Figure 5 31, and the pedestal 31 that sets firmly on two support edges 11,12 symmetry mutually.

With the protruding wall 42 that is symmetrically distributed in like manner, the load ratio that this structure makes each pedestal 31 and axle 32 diverse location places bear is more even, so anti-load-carrying ability and life-span that can more efficiently raising pedestal 31.Certainly, each side in the ladder both sides also can be provided with two or more support edge respectively.

Also be installed with handle 71 as shown in Figure 4 on the present embodiment convexity wall 42.Handle 71 is convenient to operating personnel manually pulling or promotion pedal 4.Certainly, also can be designed as can be transverse to the free pull of protruding wall 42 (perpendicular to the extended planar of protruding wall 42), at this moment for handle 71; When using handle 71; Can handle 71 pulls be come out, otherwise can handle 71 be pushed to initial position, thereby more save the installing space of ladder.

Axle 32 as shown in Figure 2 runs through chute 33 in the present embodiment, and the part that axle 32 extends pedestal 31 is interspersed with anticreep bearing pin 321.Anticreep bearing pin 321 is used to prevent that axle from 32 deviating from chute 33 and pedestal 31.

Be provided with handle 71 on each protruding wall 42 in the present embodiment.This structure operation personnel can two hand and usefulness, thereby make that the pull operation of pedal 4 is more laborsaving, convenient.

Protruding wall 42 in the present embodiment on the plate-like body 41 forms for the bar shaped panel-bending.The bar shaped panel-bending is that the technology of protruding wall 42 is fairly simple, and bar shaped plate gauge is less is convenient to offer chute 33.

Pedestal 31 is formed with limiting section 34 away from the part of

support edge

11,12 in the present embodiment; Wherein: the pedestal 31 at limiting section 34, limiting section 34 places and

support edge

11,12 form and limit the sliding space of trampling step 2, and plane parallel that sliding space permission pedal 4 edges and

support edge

11,12 are limited or the direction that coincides are slided.

When pedal 4 after axle 32 turns to the extended planar of pedal 4 and plane parallel or coincide (be preferably and parallel) that support

edge

11,12 is limited; Plane parallel that can the edge be limited with

support edge

11,12 or the direction that coincides promote pedal 4; Thereby pedal 4 is slid in the sliding space, and the effect of limiting section 34 is to avoid pedal 4 towards deviating from away from the direction of

support edge

11,12.

Support edge

11,12 and trample step 2 and can be rod member, pipe fitting or bar shaped plate in the present embodiment.That above structure all has is simple in structure, be convenient to connect, and the advantage little, that consume material is few, with low cost that takes up room.

Also be installed with grip part 72 as shown in Figure 2 in the present embodiment on the

support edge

11,12, be preferably on the every

support edge

11,12 and all be installed with grip part 72.Grip part 72 as shown in Figure 2 here can be consistent or similar with handle 71 structures on the protruding wall 42 as shown in Figure 4, also can be inconsistent or not similar.Can move

support edge

11,12 and ladder easily through grip part 72 operating personnel, and then help the carrying out of fitting operation.

Like Fig. 9 and shown in Figure 10, the crane that the utility model provided, comprise that structural member 8 and above-mentioned the utility model embodiment provided like ladder shown in Fig. 2 to Fig. 8 is arbitrary, wherein:

The bottom surface that is in the pedal 4 of use location is pressed against on the structural member 8; And can mate between pedal 4 and the structural member 8 with dismantling and be connected; Can mate between pedal 4 and the structural member 8, be connected and can connect for bearing pin with dismantling, bolt connects or screw connects; Be preferably bolt and connect (for example: on structural member 8, offer screw or set firmly nut, match) with the screw rod embedding pedal 4 of bolt and with screw or nut.The bearing pin connection has advantage simply and easily.

Structural member 8 as shown in Figure 9 comprises first structural member 81 and second structural member 82 in the present embodiment; Be installed with one or more positioning seat that offers installing hole 91 respectively on the

support edge

11,12 of the both sides in the ladder; It is a

support edge

11,12 that the

support edge

11,12 of both sides is preferably each side; Wherein be installed with two positioning seats 91 on a

support edge

11,12, wherein be installed with a positioning seat 91 on another

root support edge

11,12.

Simultaneously, also be installed with the Connection Block 92 that offers connecting hole respectively on first structural member 81 and second structural member 82.The

support edge

11,12 of ladder both sides all is movable to use location and collapsed position, wherein:

Be on the positioning seat 91 on the

support edge

11,12 of both sides of ladder of use location installing hole respectively with first structural member 81 and second structural member 82 on Connection Block 92 on connecting hole coaxial.

Coaxial installing hole and connecting hole run through and are provided with bearing pin or offer threaded securing member (for example bolt, double-screw bolt), are preferably the use bearing pin.

At this moment, bearing pin and securing member can be individually fixed in the positioning seat 91 on two support edges 11,12 of homonymy not on first structural member 81 and second structural member 82, thereby with fixing more firm of ladder.

Be in the present embodiment on the positioning seat 91 on two support edges 11,12 of ladder of collapsed position installing hole only with first structural member 81 or second structural member 82 one of them (being preferably first structural member 81) on Connection Block 92 on connecting hole coaxial.

Structural member 8 also comprises the 3rd structural member 83 in the present embodiment, and the bolt 103 that is threaded with the 3rd structural member 83 is embedded in the locating hole 5 on the pedal 4, and pedal 4 is fixed on the 3rd structural member 83.First structural member 81 or second structural member 82 one of them with the 3rd structural member 83 for integral structure or be fixedly connected.

After using ladder; Unscrew and take bolt 103 away; Pedal 4 is disassembled from the 3rd structural member 83, then pedal 4 is moved to collapsed position and pushes sliding space, then; The bearing pin or the disassembly of fastener of positioning seat 91 that will be used for fixing Connection Block 92 and the support edge 11 of second structural member 82 falls; With before installing hole on the positioning seat 91 of the support edge 11 that is fixedly connected with second structural member 82 turn to first structural member 81 on another Connection Block 92 on connecting hole coaxial, thereby the support edge 11 of using bearing pin or securing member to be fixedly connected with second structural member 82 before changes into first structural member 81 and being fixedly connected, when transporting ladder like this; Ladder not only can not take too many space, and can arbitrarily not overturn.Ladder is moved to after the destination, when reusing ladder, can once more the support edge 11 that is fixedly connected with first structural member 81 on the ladder be disassembled, then with second structural member 82 on Connection Block 92 be fixedly connected just and can use.

The component or the structural member of the disclosed or connection fastened to each other that relates to of above-mentioned the utility model; Except that other has statement, be fixedly connected all be appreciated that for: can mate fixed connection (for example using the connection of bolt or screw) with dismantling; Also be appreciated that and be: non-removable fixed connection (for example welding); Certainly, connection fastened to each other also can be replaced by integral structure (for example use casting technique is integrally formed to create).

Applied parallel, coincidence etc. is used to represent that its implication of term of geometry site comprises and its approximate, similar or approaching state in the disclosed arbitrary technical scheme of above-mentioned the utility model; That is to say in the utility model parallel comprise parallel substantially, approximate parallel, similar parallel and near parallel; In like manner, overlap also comprise substantially overlap, approximately overlap, similar coincidence and near overlapping.

Should be noted that at last: above embodiment only in order to the explanation the utility model technical scheme but not to its restriction; Although with reference to preferred embodiment the utility model has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can make amendment to the specific embodiment of the utility model perhaps is equal to replacement to the part technical characterictic; And not breaking away from the spirit of the utility model technical scheme, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.

Claims

1. a ladder is characterized in that, comprise support edge, be arranged at trampling step more than or two and trampling the pedal that step is connected through movable connection structure between the said support edge with said support edge and/or said in both sides, wherein:

The extended planar and the horizontal plane that are in the said pedal of use location parallel;

2. ladder according to claim 1 is characterized in that, said movable connection structure comprises and be fixedly arranged on said support edge and/or saidly trample the pedestal on the step and be arranged at the axle between said pedestal, the said pedal, wherein:

3. ladder according to claim 2 is characterized in that, said pedal comprises plate-like body and protruding wall, and said protruding wall is fixedly connected with a side in the said plate-like body both sides or is integral structure, and said chute is opened on the said protruding wall;

4. ladder according to claim 3 is characterized in that, said pedal comprises two said protruding walls, and two said protruding walls are symmetrically distributed on the said plate-like body, and said axle is arranged between two said protruding walls of symmetrical distribution;

5. ladder according to claim 4 is characterized in that, said axle runs through said chute, and the part that said axle extends said pedestal is interspersed with the anticreep bearing pin; And/or, all be installed with said handle on each said protruding wall.

6. ladder according to claim 2 is characterized in that said pedestal is formed with limiting section away from the part of said support edge, the said pedestal at said limiting section, said limiting section place and the sliding space that said support edge limits said pedal;

And/or, be installed with the grip part on the said support edge.

7. ladder according to claim 1 is characterized in that, said movable connection structure is an articulated structure.

8. a crane is characterized in that, comprises the arbitrary described ladder of structural member and claim 1-7, wherein:

9. crane according to claim 8; It is characterized in that; Said structural member comprises first structural member and second structural member; Be installed with the positioning seat that one or more offers installing hole respectively on the said support edge of the both sides in the said ladder, be installed with the Connection Block that offers connecting hole respectively on said first structural member and said second structural member; The said support edge of the both sides of said ladder can move to use location and collapsed position, wherein:

10. crane according to claim 8; It is characterized in that; Said structural member comprises first structural member and second structural member; Be installed with the positioning seat that one or more offers installing hole respectively on the said support edge of the both sides in the said ladder, be installed with the Connection Block that offers connecting hole respectively on said first structural member and said second structural member; The said support edge of the both sides of said ladder can move to use location and collapsed position, wherein: