JPH0735119Y2 - Telescopic support lock device for ladders, etc. - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic strut locking device such as a telescopic ladder, a stepladder, or a ladder and stepladder.

[0002]

2. Description of the Related Art Generally, ladders and stepladders are often used, and it is known that telescopic struts are attached to the lower ends of the stanchions so that the stanchions can be used even on stairs or on uneven ground such as uneven ground. . As shown in FIG. 16, this stepladder 41 has a short step bar 43 installed between a pair of left and right columns 42, 42, and a rotatable connection fitting 44 attached in the middle thereof.
The struts 42, 42 are bendable around the center of 44 so that they can be made to stand on the ground by forming an approximately eight-shape.
Telescopic struts 45,45 are attached to the lower end of the so that they can be retracted and retracted, and each telescopic struts 45,45 is locked by locking devices 46,46.
It can be fixed to 42,42.

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

[0004]

By the way, the conventional locking device 46 is provided outside each of the columns 42 in a projecting manner.
Moreover, since the operation lever 50 projects above the cross rail 43, the user may inadvertently catch a foot or some object on the operation lever 50 to release the lock, which is a safety problem.

The present invention has been made in view of the above-mentioned circumstances, and the purpose thereof is to expand and contract a ladder or the like which can be stored in a column and has a high degree of safety without being inadvertently unlocked. Providing a strut locking device.

[0006]

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 side surface, and a stopper having an engaging rack facing the stopper rack of the telescopic column that slides in the column is provided in the end of each column via the guide member and the mounting plate in the telescopic direction. It is provided so as to be able to move back and forth in the orthogonal direction, the stopper can be engaged with and disengaged from the rack, and a stopper operation lever that is movable in the expansion and contraction direction of the expansion support pillar is fitted between the stopper and the expansion support pillars on both sides of the stopper. A long guide hole is provided in the guide member in the direction in which the stopper extends and retracts, an inclined stopper drive cam hole is provided in the lever, and an engagement pin penetrating through the stopper in the direction of both guide members. Said guide slot and engaged fit engagement the stopper drive cam hole, and characterized in that disposed a biasing spring for biasing the engagement rack of the stopper in a direction to engage the stopper rack.

[0007]

According to the present invention, the stopper is operated by pushing the stopper operating lever housed in the column with the finger in the sliding direction of the telescopic column against the elastic force of the biasing spring. The retractable column moves backward from the rack in a direction orthogonal to the sliding direction of the telescopic column, the engagement is released, the lock is released, and the telescopic column can slide.

Therefore, when the pushing force is released by releasing the finger from the stopper operating lever, the stopper operating lever is pushed back to its original position by the elastic force of the biasing spring, and the stopper is stopped by the stopper pin of the lever. It is pushed by the drive cam hole and automatically engages the stopper rack,
The telescopic support is locked on the support. Therefore, unless the user's limbs such as a ladder or other objects touch the operation levers inadvertently, and unless the user pushes the stopper operation lever by his / her own will, the lock of the telescopic column with respect to the column is released. It is extremely safe because it is not done.

[0009]

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 stepladder 1 which also serves as a ladder. The stepladder 1 is a pair of right and left columns.
2,2, a short step 3 installed between the columns 2, and the columns 2,
(2) A connecting metal fitting (4) that rotatably connects the middle part, and a metal stopper (5) that prevents it from bending in an approximately eight shape and is used as a stepladder.
And a telescopic strut 7 having a non-slip 6 at the lower end and slidably and telescopically fitted in the strut 2, and a locking device 8 for the telescopic strut 7.

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

At the lower end of the telescopic support 7, a slip stopper is provided.
Six mounting brackets 14 are fixed by tacks 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, the stopper rack 11 can be easily formed by die casting, die forging, etc., and the cost can be reduced. As shown in FIGS. 1, 3, and 9 to 12, the lock device 8 of the telescopic column 7 is fixed to a rectangular mounting plate 17 having an operation window 16, a guide plate 18 and the plate 18 in an orthogonal manner. Rectangular tubular guide member 19 and the guide member 19
A stopper 21 that is slidably fitted in a direction orthogonal to the surface of the mounting plate 17 (direction orthogonal to the sliding direction of the telescopic column 7) and has an engaging rack 20 at the outer end, and a stopper operating lever 22. And an engaging pin 23 and a biasing spring 24.

The mounting plate 17 is provided with mounting bolt holes 25 for the columns 2 at the four corners, and the stopper plate 26 of the telescopic column 7 is fixed to the upper end of the mounting surface (inner side surface) 17A. The guide plate 18 is fixed to the central portion of the operation plate 27, and an operation window 27 having the same shape and size as the operation window 16 is provided in communication with the guide plate 18, and a rectangular tubular shape is provided above the operation window 27. Of the guide member
19 is stuck.

On both right and left sides of the guide member 19 (in the width direction of the mounting plate 17), long guide slots 28 are provided in the direction orthogonal to the surface of the mounting plate 17 (the 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 slidably and retractably fitted into the guide member 19. The engaging pin 23 is inserted in a penetrating manner in the left-right direction, and an outer end surface of the stopper 21 engages with the stopper rack 11. A combined rack 20 is formed.

The stopper operating lever 22 is in the shape of a substantially rectangular frame and is formed on both the left and right outer surfaces of the guide member 19 and the guide plate 18.
Is used as a guide, and it can slide up and down (sliding direction of the telescopic column 7), and slanted oblong hole-like stopper drive cam holes 29 are provided on both side surfaces, and the engagement pins 23 are provided in the cam holes 29. Is engaged with the upper end of the operation lever 22 and the guide member.
The coil-shaped urging spring 24 is fitted between the boss 19 and the urging spring 24, and the engaging rack 20 of the stopper 21 is urged by the elastic force of the spring 24 so as to be constantly engaged with the stopper rack 11. .

That is, the stopper operating lever 22 is constantly urged upward, and the engaging 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 inside and push it in the direction indicated by the arrow (b) in the figure. Unless it moves, the elastic force of the biasing spring 24 holds the locked state. Then, as shown in FIG.
When 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. Incidentally, 31 is a bias spring mounting tack, and 32 is a handling instruction sticker. In the first embodiment, the stopper 21 is such that the engaging rack 20 is always the stopper rack.
Since it is engaged with 11 and is in the locked state,
It does not slide against. Therefore, telescopic support 7
To release the lock and expand and contract, insert your finger into the column 2 from the operation hole 16 and push the operation part 22A of the stopper operation lever 22 downwards against the elastic force of the biasing spring 24. Then, the lever 22 moves downward, and the stopper 21 is retracted by the stopper driving cam hole 29 via the engaging pin 23, and the engaging rack 20 of the stopper 21 is disengaged from the stopper rack 11 and the lock is released. Therefore, it is sufficient to extend or contract the telescopic column 7 while pressing the operating portion 22A.

When the telescopic column 7 is expanded or contracted to a desired length and then the finger is released from the operating portion 22A of the operating lever 22, the elastic force of the urging spring 24 pushes the operating lever 22 upward. The stopper drive cam hole 29 of the lever 22 is the engagement pin.
The stopper 21 is advanced through 23, and its engaging rack 20
To the stopper rack 11 fixed to the telescopic support 7,
Telescopic stanchion 7 automatically locks to stanchion 2.

13 to 15 show the essential parts of the second embodiment of the present invention. The difference from the first embodiment is the guide member.
19 is a cross-sectional shape and is a groove type with an outward flange 19A, and the flange 19A is a bolt.
33 The stopper 34 is fixed to the mounting plate 17 by the nut 34, and is provided with the stopper guide holes 19B. Two L-shaped guides 19C are arranged above and below the stopper 21, and inclined stopper drive cam holes 29 are provided on both side plates of the guide member 19. Is provided, the stopper operating lever 22 is located 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. is there.

In the second embodiment, the stopper operating lever 22 is stably guided by both side plates of the guide member 19 and is always urged downward to engage the engaging rack 20 of the stopper 21 with the stopper rack 11. When the operating portion 22A of the lever 22 is pushed upward as indicated by an 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 driving 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 operation unit as in the first embodiment
The lock can be released by pushing 22A downward. The present invention is not limited to the above-described embodiments, but can be applied to an ordinary telescopic ladder and can be appropriately modified in design.

[0021]

As described above, the present invention attaches the telescopic support to the end of each support such as a ladder slidably in the vertical direction,
In a ladder or the like in which the telescopic columns can be locked to each column, a stopper rack is provided on the inner side surface of the movable telescopic column, and a stopper rack for the telescopic column that slides inside the column is provided at the end of each column. A stopper equipped with an engaging rack facing each other is provided via a guide member and a mounting plate in a direction orthogonal to the expansion / contraction direction so that the stopper can be engaged with and disengaged from the rack, and the stopper and its both sides expand / contract. A stopper operating lever that is movable in the direction of expansion and contraction of the support column is fitted between the support and the support, a long guide slot is provided in the guide member in the direction in which the stopper extends and retracts, and an inclined stopper drive cam is provided on the lever. A hole is provided, and an engaging pin penetrating through the stopper in the direction of both guide members is fitted into and engaged with the elongated guide hole and the stopper driving cam hole, and the engaging latch of the stopper is formed. Since a biasing spring that biases the lever in the direction of engaging the stopper rack is arranged, it can be stored compactly in each column, and the stopper operating lever also projects outward from the column. Since there is no such thing, there is no risk of accidentally operating the operating lever to release the lock, and the safety is extremely high. Also, the lock function of the stopper operating lever is not required, the structure is simple and inexpensive, and the appearance is improved. be able to.

[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 cross-sectional view taken along the line BB of FIG.

FIG. 8 is a left side view of FIG.

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

FIG. 10 is a left side view of FIG.

11 is a right side view of FIG. 9. FIG.

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

FIG. 13 is a front view showing a state before attachment to a column of a second embodiment of the present invention.

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 Engagement rack 21 Stopper 22 Stopper operating lever 23 Engaging pin 24 Bias spring 28 Guide long hole 29 Stopper drive 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 in 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 operating 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 toward both guide members. A telescopic column such as a ladder characterized in that an urging spring is arranged to be engaged with the elongated guide hole and the stopper driving cam hole and urge the engaging rack of the stopper in the direction of engaging with the stopper rack. Locking device.