JPH0573199U - Telescopic support lock device for ladders, etc. - Google Patents

Abstract

(57) [Summary] [Purpose] The operation lever is housed in a column and the operating lever is not exposed to the outside to eliminate the risk of inadvertent unlocking and improve safety. [Structure] This is a ladder in which a telescopic column 7 is slidably attached to the end of each column 2 such as a ladder so that the telescopic column 7 can be locked by a locking device 8. A stopper rack 11 is provided in the telescopic column 7, and a stopper 21 having an engaging rack 20 facing the rack 11 of the telescopic column 7 is provided at the end of each column 2 via a guide member 19 and a mounting plate 17. It is mounted so that it can be pulled out and put in, a stopper operating lever 22 is fitted on the outside of the guide member 19, a guide elongated hole 28 is provided in the guide member 19, and the lever 22 has an inclined stopper drive cam hole 29.
And the engaging pin 23 fitted into both holes 28, 29 is attached to the stopper 21 in a penetrating manner, and the urging spring 24 for urging the engaging rack 20 in the direction of engaging the stopper rack 11 is provided. It is provided between the upper end of the lever 22 and the guide member 19.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a telescopic support locking device such as a telescopic ladder, a stepladder, or a ladder and stepladder.

[0002]

[Prior Art]

 Generally, ladders and stepladders are often used, and it is known that each prop has a telescopic support attached to the lower end so that it can be used even on stairs or on uneven ground such as uneven ground. In this stepladder 41, as shown in FIG. 16, a short step 43 is installed between a pair of left and right columns 42, 42, and a rotatable connecting metal fitting 44 is attached to the middle portion thereof. The struts 42, 42 are bendable around the center of the struts, and they are made into a figure of eight so that they can stand on the ground. Therefore, each telescopic column 45, 45 can be fixed to each column 42, 42 by a locking device 46, 46.

Conventionally, as an example of the locking device 46, as shown in FIG. 17, a rack surface 47 is formed on the side surface of the telescopic support column 45 that slides on each support column 42, and the outer side surface of the support column 42 is formed. A rack shoe 48 is attached to the rack via a spring 49, and the telescopic support 45 is fixed to the support column 42 by engaging the rack shoe 48 and the rack surface 47. Further, the rack shoe 48 is engaged with the rack surface 47. It is known that an operating lever 50 for releasing the engagement is provided (see, for example, Japanese Utility Model Laid-Open No. 3-31700).

[0004]

[Problems to be solved by the device]

 By the way, the above-mentioned conventional locking device 46 is provided on the outside of each column 42 so as to project, and the operating lever 50 projects above the step 43, so that the user can inadvertently remove the foot or any object. May be hooked on the operating lever 50 to release the lock, which is a safety issue.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to expand and contract a ladder or the like that can be stored in a column and has a high degree of safety without accidental unlocking. Providing a strut locking device.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention takes the following technical means. That is, the present invention is a ladder or the like in which a telescopic column is slidably attached to the end of each column such as a ladder so that the telescopic column can be locked to each column. A stopper rack is provided on the inner surface of the column, and a stopper equipped with an engaging rack facing the stopper rack of the telescopic column that slides in the column is installed in the end of each column via the guide member and the mounting plate. The stopper can be engaged and disengaged with respect to the rack, and the stopper operating lever that can move in the telescopic direction of the telescopic support is fitted between the stopper and the telescopic support on both sides of the stopper. The guide member is provided with a long guide hole extending in the stopper withdrawal direction, the lever is provided with an inclined stopper drive cam hole, and the stopper penetrates toward both guide members. Pins is fitted engagement with the guide slot and the stopper drive cam hole, it is characterized in that the engagement rack of the stopper is disposed a biasing spring you urged to engage the stopper rack.

[0007]

[Action]

 According to the present invention, the stopper operating lever housed in the column is expanded and contracted by the finger in the sliding direction of the column against the elastic force of the biasing spring, so that the stopper expands and contracts from the stopper rack. The retractable column is moved in a direction orthogonal to the sliding direction to release the engagement, the lock is released, and the telescopic column can be slid.

Then, when the finger is released from the stopper operating lever to release the pushing force, the stopper operating lever is pushed back to the original position by the elastic force of the biasing spring, and the stopper is pushed through the engaging pin to move the lever. Pushed by the stopper drive cam hole, the stopper rack is automatically engaged, and the telescopic column is locked to the column. Therefore, unless the user's limbs such as a ladder or other objects touch the operation lever carelessly, and the user does not push the stopper operation lever by his / her own will, the telescopic support lock to the support will not be locked. It is never released and is extremely safe.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 to 12 show a first embodiment in which the present invention is applied to a ladder 1 that is also used as a ladder. The ladder 1 is a pair of left and right columns 2 and 2, and a short cross rail installed between the columns 2. 3, a connecting metal fitting 4 for connecting the mid-portions of the stanchions 2, 2 in a rotatable manner, an opening prevention metal fitting 5 when bent into a substantially eight shape and used as a stepladder, and a slip stopper 6 at the lower end. And a locking device 8 for the telescopic column 7, which is provided with a telescopic column 7 slidably and telescopically fitted in the column 2.

Each of the columns 2 has a quadrangular cross section, and a telescopic column 7 having a groove-shaped cross section is fitted therein so as to be slidable and with less backlash. A rectangular mounting opening 9 for the locking device 8 is provided. As shown in FIGS. 5 to 8, the telescopic column 7 is provided with two rack holding metal fittings 10 each having a substantially L-shaped cross section on the inner surface 7A of the groove-shaped bottom at intervals and over the entire length of the telescopic column 7. , A plurality of (6 in this example) stopper racks 11 are fitted, the rack retaining plate 13 is inserted into the notch 12 (see FIG. 7) provided at the upper end of the rack holding metal fitting 10, and the holding metal fitting 10 is provided. The end portion 10A is bent inwardly and fixed by caulking.

A mounting bracket 14 for the slip stopper 6 is fixed to the lower end of the telescopic column 7 with a tack 15, and the mounting bracket 14 serves as a lower stopper of the rack 11. Further, by dividing the stopper rack 11 into a plurality of pieces, it is possible to easily form the die by die casting, die forging, or the like, and it is possible to reduce the cost. As shown in FIGS. 1, 3 and 9 to 12, the locking device 8 of the telescopic column 7 is fixed to the rectangular mounting plate 17 having the operation window 16, the guide plate 18 and the plate 18 at right angles. A guide member 19 in the shape of a square tube that is inserted into the guide member 19 so as to be slidable in the guide member 19 in a direction orthogonal to the surface of the mounting plate 17 (direction orthogonal to the sliding direction of the expansion / contraction strut 7) and the outer end. It comprises a stopper 21 provided with an engaging rack 20, a stopper operating lever 22, an engaging pin 23 and a biasing spring 24.

The mounting plate 17 is provided with mounting bolt holes 25 for the support columns 2 at the four corners, and the stopper plate 26 of the telescopic support column 7 is fixed to the upper end of the mounting surface (inner side surface) 17A so that the vertical direction The guide plate 18 is fixedly attached to the central portion of the guide plate 18. The guide plate 18 is provided with an operation window 27 of the same shape and size as the operation window 16 in a communicating manner. The guide member 19 is fixed.

Further, long guide long holes 28 are provided on both left and right sides (widthwise direction of the mounting plate 17) of the guide member 19 in a direction orthogonal to the surface of the mounting plate 17 (direction in which the stopper 21 extends and retracts). The dowel pin 23 is inserted and guided. The stopper 21 has a prismatic shape and is fitted in the guide member 19 so as to be slidable and retractable. The engaging pin 23 is inserted in the left-right direction in a penetrating manner, and the outer end surface of the stopper 21 is engaged with the stopper rack 11. Combined rack 20 is formed.

The stopper operating lever 22 has a substantially rectangular frame shape and is slidable up and down (sliding direction of the telescopic column 7) with the left and right outer side surfaces of the guide member 19 and the guide plate 18 as guides. An inclined oblong hole-shaped stopper drive cam hole 29 is provided on both side surfaces, and the engagement pin 23 is fitted into and engaged with the cam hole 29, and between the upper end of the operation lever 22 and the guide member 19. The coil-shaped urging spring 24 is fitted in and is urged by the elastic force of the spring 24 so that the engaging rack 20 of the stopper 21 is always engaged with the stopper rack 11.

That is, the stopper operating lever 22 is constantly urged upward, and the engagement pin 23 is pushed by the cam hole 29 in the advancing direction of the stopper 21 shown by the arrow (a) in FIG. Although the operating portion 22A of the lever 22 is located at a position where it is easy to operate in the middle portion of the operating windows 16 and 27, positively insert a finger from the operating window 16 into the direction shown by an arrow (b) in the figure. The lock state is maintained by the elastic force of the biasing spring 24 unless it is pushed in. Then, as shown in FIG. 12, when the operating portion 22A is pushed in the direction of the arrow (b), the stopper 21 retracts into the guide member 19 and the lock is released.

As shown in FIGS. 2 to 4, the mounting plate 17 is fixed to the support column 2 by a tack 30 or the like, and the locking device 8 is housed in the support column 2. Reference numeral 31 is a bias spring mounting tack, and 32 is a handling instruction sticker. In the first embodiment described above, since the engaging rack 20 of the stopper 21 is constantly engaged with the stopper rack 11 and is in the locked state, the telescopic support 7 does not telescopically slide with respect to the support 2. Therefore, when releasing the lock of the telescopic support 7 and expanding and contracting it, put your finger into the support 2 through the operation hole 16 and move the operating part 22A of the stopper operating lever 22 downward and use the elastic force of the biasing spring 24. When the lever 22 is pushed against, the lever 22 moves downward, and the stopper driving cam hole 29 causes the stopper 21 to retract through the engaging pin 23, so that the engaging rack 20 of the stopper 21 is disengaged from the stopper rack 11. Since the lock is released by pressing the operating portion 22A, the telescopic column 7 can be extended or contracted.

Then, after the telescopic support 7 is expanded and contracted to a desired length, when the finger is released from the operation portion 22A of the operation lever 22, the elastic force of the biasing spring 24 pushes the operation lever 22 upward, The stopper drive cam hole 29 of the lever 22 advances the stopper 21 via the engaging pin 23, engages the engaging rack 20 with the stopper rack 11 fixed to the telescopic column 7, and the telescopic column 7 is attached to the column 2. It will be locked automatically.

FIGS. 13 to 15 show the essential parts of the second embodiment of the present invention. Differently from the first embodiment, the guide member 19 has a cross-section outward flange 19A and a grooved groove 19A. Are fixed to the mounting plate 17 with bolts 33 nuts 34, and are provided with stopper guide holes 19B, and two L-shaped guides 19C are arranged above and below the stopper 21, and inclined stoppers are provided on both side plates of the guide member 19. A drive cam hole 29 is provided, the stopper operating lever 22 is positioned between both side plates of the guide member 19 and the stopper 21, and a biasing spring 24 is fitted between the lower guide 19C and the operating portion 22A of the lever 22. That is the point.

In the second embodiment, the stopper operating lever 22 is more stably guided by the both side plates of the guide member 19 and is always urged downward so that the engaging rack 20 of the stopper 21 is locked. When the operating portion 22A of the lever 22 is pushed upward as indicated by the arrow (c) in the figure, the stopper 21 is retracted and the lock is released. ..

In the second embodiment, the inclination direction of the stopper drive cam hole 29 is reversed, and the biasing spring 24 is interposed between the upper guide 19C and the upper end portion of the stopper operating lever 22. The lock can be released by pushing the operating portion 22A downward, as in the first embodiment. The present invention is not limited to each of the above-described embodiments, but can be applied to an ordinary telescopic ladder and can be appropriately modified in design.

[0021]

[Effect of the device]

 As described above, the present invention is a ladder or the like in which the telescopic columns are slidably attached to the ends of each column such as a ladder so that the telescopic columns can be locked to each column. A stopper rack is provided on the inner surface of the telescopic column, and a stopper equipped with an engaging rack is installed in the end of each column so as to face the stopper rack of the telescopic column that slides inside the column via a guide member and a mounting plate. The stopper operating lever is movable between the stopper and the rack on both sides of the stopper, and the stopper operating lever that can move in the telescopic direction of the telescopic column is installed between the stopper and the telescopic columns on both sides of the stopper. The guide member is provided with a long guide hole extending in the direction in which the stopper extends and retracts, and the lever is provided with an inclined stopper drive cam hole, and the stopper extends through both guide members in the direction of both guide members. The engaging pin is fitted into and engaged with the guide elongated hole and the stopper driving cam hole, and an urging spring is arranged to urge the engaging rack of the stopper in the direction of engaging with the stopper rack. Since it is a thing, it can be compactly stored in each strut, and since the stopper operating lever does not project outside from the strut, there is no danger of inadvertently operating the operating lever to release the lock, resulting in extremely high safety. Moreover, since the stopper operating lever does not need to be locked, the structure is simple and the cost is low, and the appearance can be improved.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is an overall side view of a ladder and stepladder adopting the present invention.

FIG. 3 is a left side view of FIG.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a side view of the telescopic column.

FIG. 6 is a left side view of FIG.

FIG. 7 is an enlarged sectional view taken along line BB of FIG.

FIG. 8 is a left side view of FIG.

FIG. 9 is a front view showing a state before being attached to the support column of the first embodiment.

FIG. 10 is a left side view of FIG.

FIG. 11 is a right side view of FIG.

FIG. 12 is a front view corresponding to FIG. 9 showing an unlocked state.

FIG. 13 is a front view of the second embodiment of the present invention before being attached to a support column.

FIG. 14 is a left side view of FIG.

15 is an enlarged cross-sectional view taken along line CC of FIG.

FIG. 16 is a ladder and stepladder equipped with a conventional locking device.

FIG. 17 is a partially cutaway front view of a conventional example.

[Explanation of symbols]

 1 Ladder and stepladder 2 Strut 7 Stretchable strut 8 Stretchable strut locking device 11 Stopper rack 17 Mounting plate 19 Guide member 20 Engaging rack 21 Stopper 22 Stopper operating lever 23 Engaging pin 24 Bias spring 28 Guide long hole 29 Stopper driving cam hole

Claims (1)

[Scope of utility model registration request] 1. A ladder or the like in which a telescopic column is slidably attached to the end of each column such as a ladder so that the telescopic column can be locked to each column. A stopper rack is provided on the side surface, and a stopper provided with an engaging rack facing the stopper rack of the telescopic column that slides inside the column at the end of each column is orthogonal to the direction of expansion and contraction through the guide member and the mounting plate. The stopper operation lever that is movable in the telescopic direction of the telescopic column is fitted between the stopper and the telescopic columns on both sides of the stopper. The guide member is provided with a long guide hole extending in the direction in which the stopper extends and retracts, the lever is provided with an inclined stopper drive cam hole, and the stopper is provided with an engagement pin penetrating in the direction of both guide members. A telescopic column such as a ladder characterized in that an urging spring is provided which is engaged with the guide elongated hole and the stopper driving cam hole and urges the engaging rack of the stopper in the direction of engaging with the stopper rack. Locking device.