CN200985738Y

CN200985738Y - Telescopic ladder

Info

Publication number: CN200985738Y
Application number: CN 200620153713
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

Abstract

The utility model discloses a telescopic ladder, each stair of which is provided with only one controlling button to control a spring cotters on the two ends of the stair. So the telescopic operation of the telescopic ladder can be finished with only one hand and the other hand of a worker is used to hold the descending stair, which make the operation more convenient and can avoid the production of noise.

Description

A kind of extension ladder

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 extension ladder " (application number is 02257142.6) discloses a kind of extension ladder, 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 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, and is connected with the button that is fixed on the step two ends.In the time of must launching extension ladder, inner layer sleeve is pulled out, make the locating hole of its lower end come by the spring catch, spring catch ejects, and inserts in the lower end locating hole of inner layer sleeve.In the time of must shrinking extension ladder, control button, in the spring catch withdrawal step, inner layer sleeve can fall down under action of gravity, finishes contractive action.

The shortcoming of said structure is: because each layer step two ends have a control button respectively, when shrinking extension ladder, need two hands to move simultaneously, rising does not sell controls the speed that inner layer sleeve falls down, it produces sizable noise when directly falling down, and crushes operator's finger easily.

The utility model content:

The purpose of this utility model is: a kind of extension ladder is provided, can makes the workman when shrinking extension ladder, can free hand to control the speed that it falls down, prevent that noise from producing, and prevent to jam a finger.

The purpose of this utility model is to realize like this, a kind of extension ladder, comprise two ladders that the sleeve by socket layer by layer constitutes, sleeve up and down two ends at least respectively has a locating hole, 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, and spring catch withstands on the inner layer sleeve, it is characterized in that: the spring catch at step two ends all is connected with a control knob on the step.

When launching extension ladder, inner layer sleeve is pulled out, when the lower end of inner layer sleeve locating hole was come the spring catch place, spring catch ejected, and snaps in this locating hole, and this grade step promptly is fixed on expanded position.When shrinking extension ladder, handle the control knob, spring catch is drawn out in locating hole, and inner layer sleeve loses detent force, can move down, and the contractive action of extension ladder can be finished.Because two spring catch on the same step of the present utility model are controlled by same control knob, when operating, the workman only need control knob of a hand operation can finish contractive action, the another hand can buttress inner layer sleeve, controls the speed of its whereabouts, thereby avoids producing noise and crush staff.

Description of drawings:

Fig. 1 is existing extension ladder schematic diagram;

Fig. 2 is the schematic diagram of embodiment 1 of the present utility model;

Fig. 3, Fig. 4 are the schematic diagrames of embodiment 2 of the present utility model;

The specific embodiment:

Embodiment 1

As shown in Figure 2, extension ladder ladder 8 is sleeves 5 of socket layer by layer, horizontal step 6 hollows also are fixed on each layer sleeve 5 upper ends, two spring catch 7 are fixed at step 6 both ends, spring catch 7 inserts in the upper end locating hole of relevant sleeve 5, and withstand on inner layer sleeve 51 walls, two spring catch 7 in the step 6 are connected with the knob 10 at step 6 middle parts.When launching extension ladder, inner layer sleeve is pulled out, when the lower end of inner layer sleeve locating hole was come the spring catch place, spring catch ejected, and snaps in this locating hole, and the step of this inboard sleeve correspondence promptly is fixed on expanded position.When shrinking extension ladder, turning knob 10, spring catch 7 is drawn out in locating hole 9, and inner layer sleeve 51 can move down, and the contractive action of extension ladder can be finished.

Fixing torsion spring 12 on knob 10, torsion spring 12 is to the direction application of force of holddown spring pin.Because increased the torsion spring to the holddown spring pin direction application of force, under the situation of no enough external force effects, knob can not deviate from outside the pin-and-hole because of unintentional rotation makes spring catch, increased this practical safety.

Embodiment 2

The control knob is button also, and when inwardly touching the button with hand, spring catch is drawn out.

As shown in Figure 3, control knob is a button, and button 13 is connected with knob 10, and knob 10 is connected with spring catch.Inwardly pressing button promptly drives knob 10 and rotates, and spring catch is pulled out from locating hole, and extension ladder can be finished contractive action.

As shown in Figure 4, control knob is a button 13, and a platform 14 is arranged on the button 13, and platform turns an end in contact with the L type control of handing-over in step, and the other end that control is turned is connected with spring catch.Inwardly pressing button 13 promptly drives control and turns 14 rotations, and spring catch is pulled out from locating hole, and extension ladder can be finished contractive action.

Spring is set on button, and spring makes button keep the outwards trend of motion outwards to buttons force, and under the situation of no enough external force effects, button can deviate from outside the pin-and-hole spring catch because of accident is pressed into, and has increased this practical safety.

All the other are identical with embodiment 1.

Claims

1. extension ladder, 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 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, it is characterized in that: the spring catch at step two ends all is connected with a control knob on the step.

2. extension ladder according to claim 1 is characterized in that: described control knob is a knob.

3. extension ladder according to claim 2 is characterized in that: fixing torsion spring on knob, torsion spring is to the direction application of force of holddown spring pin.

4. extension ladder according to claim 1 is characterized in that: described control knob is a button, and when inwardly touching the button with hand, spring catch is drawn out in locating hole.

5. extension ladder according to claim 4 is characterized in that: spring is set on button, and spring is outwards to buttons force.