CN200985737Y

CN200985737Y - Automatically contracting telescopic ladder

Info

Publication number: CN200985737Y
Application number: CNU2006201537113U
Authority: CN
Inventors: 苏正平
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-11-27
Filing date: 2006-11-27
Publication date: 2007-12-05
Anticipated expiration: 2016-11-27
Also published as: WO2008064555A1

Abstract

The utility model discloses an automatically contract telescopic ladder comprising two ladder frames which consist of sleeves that are sleeved layer upon layer. The upper and lower ends of the sleeves are respectively provided with at least a locating hole, and the upper ends of the corresponding layers of sleeves of the two ladder frames are fixed with stairs, the two ends of which are hollow, and a locating pin, which is a spring cotter and pushes against the inner layer of sleeve, is inserted into the upper end locating hole of the layer of sleeve, and the two ends of the stairs are respectively articulated with a L-shaped controlling crutch, an end of which pushes against the middle part of the spring cotter. The utility model is characterized in that the other end edge of the controlling crutch is flush to the lower edge of the stair or hides in the stair edge, and that the lower stair is provided with a lug boss corresponding to the controlling crutch. The utility model hides the controlling crutch in the stairs, which can avoid the danger caused by the unintentional touch of the controlling crutch by climbers.

Description

A kind of extension ladder that can shrink automatically

Technical field:

The utility model relates to a kind of extension ladder, is used in the occasion that building site, warehouse etc. need ascend operation.

Background technology:

Chinese patent " a kind of telescopic ladder " (patent No. is 200420091638.2) discloses a kind of extension ladder, as shown in Figure 1.Comprise two ladders that the sleeve by socket layer by layer constitutes, two ends have a locating hole are at least respectively arranged about the sleeve, the fixing step in the sleeve of equivalent layer upper end on two ladders, end, step two ends hollow, in the alignment pin of the upper end locating hole that inserts this layer sleeve is arranged, this alignment pin is a spring catch, spring catch withstands on the inner layer sleeve wall, each the hinged L shaped control of step two ends is turned, and control is turned an end and withstood on the spring catch middle part, and the other end exposes outside the step bottom.When needs launch extension ladder, inner layer sleeve is pulled out, make the lower end locating hole of inner layer sleeve come the spring catch place, spring catch ejects, and snaps in it, and inner layer sleeve can be fixed on expanded position, successively pulls out inner layer sleeve, and extension ladder promptly is unfolded.When needs shrink extension ladder, only need the withdraw spring catch of subordinate step, make the step and the corresponding sleeve thereof of time subordinate under action of gravity, drop, turn bared end when the control on the inferior subordinate step and run on the subordinate step tread, it is stressed and rotate around pin joint that bared end is turned in control, and its other end promotes spring catch, make spring catch withdraw, the inner layer sleeve corresponding with this layer step can drop under action of gravity again, so circulation, and all step homogeneous phases should shrink.Realize shrinking automatically.

The shortcoming of such scheme is: control is turned an end and is exposed outside the step, turns if the workman has knocked control because of carelessness over when upwards climbing up by holding on to, and just might cause all upper strata steps all to drop successively and produces danger.

The utility model content:

The purpose of this utility model provides a kind of extension ladder that can shrink automatically, both can realize the function of contraction automatically, can ensure safe in utilization again.

The purpose of this utility model is achieved in that a kind of extension ladder that can shrink automatically, comprise two ladders that the sleeve by socket layer by layer constitutes, sleeve at least respectively has a locating hole in two ends up and down, the fixing step in two sleeves of equivalent layer upper ends on two ladders, end, step two ends hollow, in the alignment pin of the upper end locating hole that inserts this layer sleeve is arranged, this alignment pin is a spring catch, spring catch withstands on the inner layer sleeve, each the hinged L shaped control of step two ends is turned, control is turned an end and is withstood on the spring catch, it is characterized in that: the other end edge that turns of control is concordant with the step lower limb or be hidden in the nosing, has with controlling to turn corresponding boss on subordinate's step.

Because the edge that turns of control of the present utility model is concordant with the step lower limb or be hidden in the nosing, outstanding position when the workman climbs up by holding on to it on, can not run into control and turn, and extension ladder can the accident contraction and cause danger; Turn corresponding boss owing on subordinate's step, having simultaneously with control, adjust the spring catch of subordinate step, inferior subordinate step drops downwards, when boss withstands on control when turning, controls and turns stressed and rotate around pin joint, its other end promotes spring catch, make spring catch withdraw, the inner layer sleeve corresponding with this layer step has and can drop under action of gravity, so circulation, all step homogeneous phases should shrink, and realize automatic contractile function.

Description of drawings:

Fig. 1, Fig. 2 are the existing extension ladder schematic diagrames that can shrink automatically;

Fig. 3, Fig. 4 are the extension ladder schematic diagrames that can shrink automatically of the present utility model.

The specific embodiment:

As Fig. 3, the extension ladder that can shrink automatically shown in Figure 4, comprise two ladders 2 that the sleeve 1 by socket layer by layer constitutes, the two ends up and down of middle each layer sleeve 1 have a locating hole 3 are at least respectively arranged, the fixing step 4 in two sleeves, 1 upper end of equivalent layer on two ladders 2, end, step 4 two ends 5 hollows, in the alignment pin 6 that inserts this layer sleeve upper end locating hole 3 is arranged, this alignment pin 6 is spring catch, alignment pin 6 withstands on the inner layer sleeve, each the hinged L shaped control of step 4 two ends turns 7, control is turned 7 one ends and is withstood on the spring catch middle part, it is characterized in that: the other end edge that turns of control and step 4 lower limbs 8 are concordant or be hidden in the nosing, have with controlling to turn corresponding boss 9 on subordinate's step 4.

On control is turned elastic component is set, elastic component is to the direction application of force of holddown spring pin.The fixed-site that control can be turned with the raising security performance, and avoids it to rock the generation noise in step, influences user's mood.

Claims

1. extension ladder that can shrink automatically, comprise two ladders that the sleeve by socket layer by layer constitutes, middle each layer sleeve at least respectively has a locating hole in two ends up and down, the fixing step in each layer sleeve of equivalent layer upper end on two ladders, end, step two ends hollow, in the alignment pin that inserts this layer sleeve upper end locating hole is arranged, this alignment pin is a spring catch, spring catch withstands on the inner layer sleeve, each the hinged L shaped control of step two ends is turned, control is turned an end and withstood on spring catch middle part, it is characterized in that: the other end edge that control is turned is concordant with the step lower limb or be hidden in the nosing, has with controlling to turn corresponding boss on subordinate's step.

2. the extension ladder that can shrink automatically according to claim 1 is characterized in that: on control is turned elastic component is set, elastic component is to the direction application of force of holddown spring pin.