WO2018192139A1

WO2018192139A1 - Ladder post locking device for extension ladder

Info

Publication number: WO2018192139A1
Application number: PCT/CN2017/095417
Authority: WO
Inventors: 张钊
Original assignee: 东莞威信运动用品有限公司
Priority date: 2017-04-20
Filing date: 2017-08-01
Publication date: 2018-10-25
Also published as: DK3613936T3; GB201916437D0; CN206769793U; GB2576279B; GB2576279A; EP3613936B1; EP3613936A4; EP3613936A1

Abstract

A ladder post locking device (100) for an extension ladder comprises a latch pin (1), a button (2), an indication component (3), a display component (4) and an elastic member (5). The latch pin (1) is movably provided inside a rung (200) of an extension ladder. The button (2) is provided at the rung (200) and used to drive the latch pin (1) to perform a locking operation or an unlocking operation on an upper ladder post (301) and a lower ladder post (302) which are sleeved together. The display component (4) is fixed at an outer side of the rung (200) and has at least two display regions. The indication component (3) moves with a movement of the button (2) or the latch pin (1) to point to the corresponding display region. The ladder post locking device (100) for an extension ladder can indicate whether a ladder post of an extension ladder is locked or unlocked, thereby improving usage safety.

Description

Step ladder locking device for telescopic ladder

Technical field

The present application relates to an extension ladder, and more particularly to a ladder column locking device for an extension ladder.

Background technique

The existing extension ladder generally includes a pedal, a plurality of ladder columns and a ladder column locking mechanism, and the ladder ladders that are mutually nested are locked by using a plurality of ladder column locking mechanisms, so that the entire extension ladder is locked in the extended state; When the lock is released, the button is driven to insert the lock pin into the locking hole of the ladder post, so that the ladder post releases the lock. However, since the locking pin of the ladder locking mechanism is located inside the pedal, the user cannot see whether the locking pin has been accurately inserted into the locking holes of the two ladder posts, and therefore, only the position or state of the button protruding from the bottom of the pedal can be seen. To determine if the lock pin has locked the ladder post. However, due to the difference in the level of each pedal, the higher pedal is easily seen by the user, while the lower pedal is blocked by the pedal itself, the state of the button cannot be seen, and the lower button distance is used. It is far away. Therefore, it is not easy to see the state of the button. When the lock pin is not accurately inserted into the ladder column and the extension ladder is not locked in a safe state, the user may easily accidentally accept the extension ladder when climbing the ladder. The danger of folding, and then the safety problem.

Application content

The purpose of the present application is to provide a ladder column locking device capable of displaying whether the ladder column of the extension ladder is locked or unlocked and improving the safety of use.

In order to achieve the above object, a ladder column locking device for an extension ladder provided by the present application includes a lock pin, a button, an indication member and a display member, the lock pin is movably disposed in a pedal of the extension ladder, and the button is disposed on the pedal And driving the locking pin to lock or release the upper ladder column and the lower ladder column that are mutually nested; the display component is fixed to the outer side of the pedal and is provided with at least two display areas, and the indicating component is The button or the action of the lock pin moves while being indicated on the corresponding display area.

Compared with the prior art, since the present application provides an indicating component and a display component, and the pointing component moves with the action of the button or the locking pin, the display component is disposed on the pedal The outer side, so that the indicating component is indicated on different areas of the display component, by setting a reminder on each display area, the user can quickly determine whether the locking pin is inserted into the locking hole, thereby knowing that the telescopic lock is extending Whether it can be safely used in the state, avoid accidents, and effectively improve the safety of use.

Preferably, the indicating member is fixedly connected to the button. Since the button is driving the lock pin to lock or unlock, connecting the indicator member to the button may also transmit the action of the lock pin to the indicator member, thereby causing the indicator member to reflect Go to the display unit.

Specifically, the indication member includes a fixing portion, one end of the fixing portion is fixed to the button, and the other end is bent and extended to an outer side of the pedal to form an indication portion indicating the display area.

Preferably, the locking pin is horizontally slidably disposed on the pedal, and the button is pivotally connected to the pedal and one end is engaged with the locking pin.

Specifically, the button is provided with two arc-shaped cards, and the lock pin is provided with an annular card slot, and the two cards are disposed on the card slot and clamp the lock pin.

Specifically, the button is provided with a pressing portion that protrudes from a bottom of the pedal, and the indicating member is fixedly coupled to the pressing portion.

Preferably, the ladder column locking device of the extension ladder further comprises an elastic member, and the elastic member provides an elastic force for keeping the locking pin locked to the upper ladder column and the lower ladder column.

DRAWINGS

Fig. 1 is a view showing a state in which a ladder column locking device of the extension ladder of the present application is mounted on a ladder.

2 is a view showing a state in which a ladder column locking device of the extension ladder of the present application is mounted on one of the ladders.

Fig. 3 is a view showing a state in which the ladder column locking device of the extension ladder of the present application is locked.

4 is an exploded view of the ladder column locking device of the extension ladder of the present application.

Fig. 5 is a view showing a state in which the ladder column locking device of the extension ladder of the present application is unlocked.

detailed description

The details of the technical contents, structural features, and effects achieved by the present application will be described in detail below with reference to the embodiments.

As shown in FIG. 1 to FIG. 4, the ladder column locking device 100 of the extension ladder of the present application can be disposed on the pedal 200 of any U-shaped ladder of the extension ladder. In this embodiment, the first section U of the extension ladder is disposed. On the ladder, the other ladders use the existing ladder column locking device. The ladder column locking device 100 of the extension ladder of the present application includes a lock pin 1, a button 2, an indication member 3, a display member 4, and an elastic member 5, and the lock pin 1 is movably disposed in the pedal 200 of the extension ladder, the elastic member 5 is a compression spring disposed between the lock pin 1 and the pedal 200, and an elastic force thereof causes the lock pin 1 to be slidably inserted into the locking hole 300a of the ladder post. The button 2 is disposed on the pedal 200 and drives the lock pin 1 to lock or unlock the mutually staggered upper ladder column 301 and the lower ladder column 302; the display member 4 is fixed to the outside of the pedal 200 and a plurality of different display areas are provided, the indicator member 3 moves with the action of the button 2 or the lock pin 1 while being indicated on the corresponding display area; the elastic member 5 provides a lock The pin 1 keeps the elastic force of the upper ladder column 301 and the lower ladder column 302 locked. Specifically, as follows:

Referring to FIG. 3 and FIG. 4 , the lock pin 1 is horizontally slidably disposed on the pedal 200 , and the button 2 is pivotally connected to the pedal 200 via a pivot shaft 2 a . One end of the button 2 is provided with two arc-shaped cards 21, and the other end of the button 2 is provided with a pressing portion 22, and the locking pin 1 is provided with an annular card slot 11, and the two cards 21 are provided. The lock pin 1 is clamped on the card slot 11. The pressing portion 22 protrudes from the bottom of the pedal 200.

As shown in FIG. 4, the indicator member 3 is fixedly coupled to the pressing portion 22 of the button 2. Specifically, the indicating member 3 includes a fixing portion 31, one end of the fixing portion 31 is fixed to the pressing portion 22 of the button 2, and the other end is bent and extended to the outside of the pedal 200 to form an indication on the display region. The instruction unit 32. The display unit 4 is a color card, and the surface of the color card is provided with different color regions to form a plurality of different display regions. In the embodiment, the upper portion of the color card is a red display region 41, and the lower portion is green. In the display area 42, a red-green gradient transition color display area 43 is formed between the red display area 41 and the green display area 42. Since the button 2 drives the lock pin 1 to lock or unlock, the connection of the indicator member 3 to the button 2 can also transmit the action of the lock pin 1 to the indicator member 3. Thereby, the indicating member 3 is reflected on the display member 4.

In combination with the above and in conjunction with FIGS. 3 and 5, when the lock pin 1 fails to be inserted into the locking hole 300a, the indication portion 32 of the indicating member 3 is in a red display on the upper portion of the color card. In the area 41, the pin is separated from the locking hole 300a, and the upper ladder column 301 and the lower ladder column 302 are not locked. At this time, an accident is likely to occur and cannot be used. When the locking pin 1 is completely and accurately inserted into the locking hole 300a, the locking pin 1 drives the button 2 to rotate clockwise, and the button 2 drives the indicating member 3 to rotate clockwise. The indicating portion 32 on the indicating member 3 is rotated clockwise by a certain angle, and is indicated on the green display region 42, indicating that the locking pin 1 has locked the upper ladder column 301 and the lower ladder column 302, and is safely used at this time. Extension ladder. Similarly, when the lock pin 1 is inserted into the lock hole 300a but not fully entered, the indication portion 32 is indicated on the transition color display area 43 of the color card. When the button 2 is pressed to release the locking pin 1 from the locking hole 300a, the locking pin 1 drives the button 2 to rotate counterclockwise, and the button 2 drives the indicating member 3 to rotate counterclockwise. The indication portion 32 is rotated counterclockwise into the red display area 41 of the upper portion of the color card, indicating that the lock pin 1 is disengaged from the locking hole 300a, and the upper ladder column 301 and the lower ladder column 302 can be contracted at this time to achieve the upper side. The unlocking and folding of one ladder column and the unlocking of the ladder column locking device of the other ladder columns above can completely realize the folding telescopic ladder.

Compared with the prior art, since the present application provides an indication member 3 and a display member 4 and causes the indication member 3 to move with the action of the button 2 or the lock pin 1, the display member is made 4 is disposed on the outer side of the pedal 200, so that the indicating component 3 is indicated on different areas of the display component 4, by setting a reminder on each display area, the user can quickly determine whether the locking pin 1 is inserted into The hole 300a is locked, so that whether the telescopic lock can be safely used in the extended state is avoided, accidents are prevented, and the safety of use is effectively improved.

In addition, in the present application, the indicator member 3 may be connected to the lock pin 1, and then the indicator member 3 is horizontally slid, and the display member 4 is further provided according to the sliding direction of the indication portion 32 of the indicator member 3, so that the display member 4 is provided. Each of the different display areas is within the range of movement of the indicator portion 32 to achieve the purpose of displaying whether the ladder column of the extension ladder is locked or unlocked.

Secondly, the button 2 can also be set as a sliding type, and the sliding button 2 can drive the locking pin 1 to slide to lock or release the upper ladder column 301 and the lower ladder column 302, and then connect the indicating component 3 with the button 2. The indicator member 3 is slid, and then the display member 4 is disposed according to the sliding direction of the indication portion 32 of the indication member 3 such that each of the different display regions is also within the movement range of the indication portion 32. It is also possible to achieve the purpose of displaying whether the ladder column of the extension ladder is locked or unlocked; the above will not be described in detail herein.

The above is only the preferred embodiment of the present application, and the scope of the application is not limited thereto, and the equivalent changes made by the scope of the application of the present application are still within the scope of the present application.

Claims

A ladder column locking device for an extension ladder, comprising: a locking pin, a button, an indicating component and a display component, wherein the locking pin is movably disposed in a pedal of the extension ladder, the button is disposed on the pedal and driven The locking pin locks or unlocks the upper ladder column and the lower ladder column that are sleeved with each other; the display component is fixed to the outer side of the pedal and is provided with at least two display areas, the indicating component is associated with the button or The movement of the lock pin moves while being indicated on the corresponding display area.
A ladder column locking device for an extension ladder according to claim 1, wherein said indicating member is fixedly coupled to said button.
A ladder column locking device for an extension ladder according to claim 2, wherein said indicating member comprises a fixing portion, one end of said fixing portion is fixed to said button, and the other end is bent and extended to the outside of said pedal An indication portion indicating the display area is formed.
The ladder column locking device of the extension ladder according to claim 1, wherein the locking pin is horizontally slidably disposed on the pedal, the button is pivotally connected to the pedal and one end is engaged with the locking pin. .
A ladder column locking device for an extension ladder according to claim 4, wherein said button is provided with two arc-shaped cards, said locking pin is provided with an annular card slot, and said two cards are disposed on The locking pin is clamped on the card slot.
A ladder column locking device for an extension ladder according to claim 4, wherein said button is provided with a pressing portion, said pressing portion is extended at a bottom portion of said pedal, and said indicating member is fixed to said pressing portion connection.
A ladder column locking device for an extension ladder according to claim 1, wherein said ladder column locking device of said extension ladder further comprises an elastic member, said elastic member providing a locking pin for locking said upper ladder The elastic force of the column and the lower ladder column.