JP3250792B2 - Telescopic feet for workbench - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic leg provided on a work platform such as a work scaffold, a stepladder, and a horse whose height can be freely adjusted according to a work place.

[0002]

2. Description of the Related Art When constructing walls and ceilings indoors in a building site, work platforms such as work scaffolds, stepladders, and horses are used to raise a work floor in accordance with the height of a work place. In addition, similar work benches are used for caring for and harvesting fruit trees at farms and for various tasks at home. As this type of work table, there is a work table having telescopic legs for adjusting the height of a work floor. For example, a working scaffold introduced in Japanese Patent Application Laid-Open No. 6-42163 discloses a leg length, that is, a height of a working floor, by inserting a telescopic leg into a main leg and pinning the telescopic leg at a predetermined position. I am adjusting. In addition, actual Kaihei 6-2
In Japanese Patent No. 4133, a telescopic leg of a pedestal fitting for fixing the telescopic leg by locking the telescopic leg with a pin is introduced.

[0003]

However, bolts and bolts are formed in locking holes formed at appropriate intervals along the longitudinal direction of the telescopic legs.
In the method of adjusting the length by inserting a locking tool such as a pin, the length of the telescopic leg only changes stepwise. for that reason,
The work surface cannot be adapted to the floor and ground with various undulations, and the workbench will be installed with the work floor inclined.
The posture of the worker is unstable and dangerous. As a steplessly adjustable leg, a method is known in which a sliding portion is pressed by a pressing plate, and the length of the leg is fixed using a frictional force between the sliding portion and the pressing plate. However, in this method, when an excessive load is applied to the counter, the frictional engagement between the sliding portion and the pressing plate is released, and the counter may be rapidly lowered.
For this reason, the load applied to the counter is limited, and the use form of a scaffold, a work table, or the like is restricted. Further, since the sliding portion is gripped by friction, the action of fixing the length of the leg may be deteriorated with time due to wear of the member. In addition, it is troublesome to set the legs to the required length, and it is one of the drawbacks that it is difficult to use. The present invention has been devised to solve such a problem, and the engagement state for fixing the length of the telescopic leg is released by incorporating a safety lock mechanism for fixing and holding the locked state. An object of the present invention is to provide a workbench extensible leg that can prevent the above situation reliably and can continuously change the length of the extensible leg when the lock is released and can adjust it to a free length.

[0004]

SUMMARY OF THE INVENTION In order to achieve the object, a telescopic leg for a workbench according to the present invention has a leg main body having a rectangular internal space, and is inserted into the leg main body to extend along a longitudinal direction. A slide member having a plurality of rows of projections formed on an inner surface, a mounting bracket fixed to an end of a leg body on a side where the slide member is inserted, and a projection of the slide member pivotably attached to the mounting bracket. A lock lever with an arm protruding laterally from a rack shoe formed with a plurality of ridges meshing with the row, and interposed between the mounting bracket and the lock lever,
A compression spring that urges the lock lever in the direction in which the projection of the rack shoe is pressed against the row of projections of the slide member, and is attached to the mounting bracket along the width direction of the leg body, and moves between the locked position and the unlocked position. A lock pin that moves upward, a lock fitting protruding upward is fixed to the arm of the lock lever, and the lock pin is provided with a large-diameter portion and a small-diameter portion. The protruding tip of the lock fitting is pressed from the side surface to the large diameter part and the vicinity of the peripheral face of the large diameter part faces. The lock pin, the compression spring and the lock fitting are positioned so as to be separated from each other.

The mounting bracket has a mounting portion fixed to the leg body and a mounting portion extending laterally from the mounting portion and fixing the tread frame. A pair of flanges are provided at the corners of both mounting portions. The one provided integrally is used. A lock pin is inserted between these flanges. On one side of the small diameter portion of the lock pin, a flange portion is provided which abuts on the inner surface of one of the flanges and regulates the pushing amount of the lock pin. It is preferable that the lock pin has a retaining fitting mounted near one end protruding laterally from one flange, and a soft elastic body fitted and inserted near the other end protruding laterally from the other flange. When the lock pin is at the lock position, the soft elastic body is compressed between the inner peripheral surface of the pin insertion hole formed in the other flange and the peripheral surface of the lock pin, thereby restricting the axial movement of the lock pin. You.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described with respect to a telescopic leg provided on a horse, but the present invention is not limited to a horse and can of course be applied to a stepladder or another work table. . As shown in FIG. 1, a pedestal to which the present invention is applied has legs 2 attached to four corners of a top plate 1 serving as a work floor. The upper end of the leg portion 2 is swingably attached to the top plate portion 1 by a mounting bracket 3. The leg 2 in the upright state is maintained in a fixed positional relationship with the top plate 1 by the bendable reinforcing member 4. A plurality of steps 5 and 5 corresponding to the height of the work floor are provided between the adjacent legs 2 and 2. It is preferable that the top plate portion 1, the leg portion 2, the reinforcing member 4, and the step frame 5 are formed of an extruded aluminum material excellent in lightweight, corrosion resistance, and surface properties. Leg 2
Has a slide member 20 inserted into the leg body 10 as shown in FIG. 2, and the positional relationship of the slide member 20 with respect to the leg body 10 is fixed by the locking mechanism 30.

The leg body 10 is made of an extruded aluminum material having a substantially rectangular hollow cross section (FIG. 3), and forms a bracket mounting space 11 with a part of a side face cut away.
The rib 16 rising from both ends of the inner side surface where the fitting mounting space 11 is provided is bent inward on the way, and the fitting seating portion 1 is formed.
It becomes 2. Rivet fixing holes 13 for fixing the mounting bracket 31 (FIG. 2) of the locking mechanism 30 are formed on a side surface orthogonal to the inner side surface where the bracket mounting space 11 is provided. In the inside of the side near the other surface of the leg body 10 located on the opposite side of the bracket mounting space 11, there are guide grooves 14, 14 slightly widened to the side. Further, the ribs 16 forming the mold seating portion 12 are cut out at appropriate intervals in the longitudinal direction of the leg body 10 to form a notch portion 17 for positioning the end of the step frame 5. Slide member 20
Is made of an extruded aluminum material slightly smaller than the internal space of the leg body 10, and has a cross-sectional shape in which a portion where the fitting mounting space 11 faces when inserted into the leg body 10 is open. The slide member 20 has both sides 21, 21 of a hollow double-walled structure to ensure strength.
Both ends 21 and 21 of the hollow double-walled structure have sliding ends 22 and 22 whose one ends slightly protrude laterally and fit into the guide grooves 14 of the leg body 10.

A plurality of ridges 24 extending in the longitudinal direction of the slide member 20 are formed on the inner surface of the side surface 23 between the side portions 21 of the hollow double wall structure. The ridges 24, 24,... Are partially crushed by knurling, pressing, or the like in the effective length range of the leg portion 2 to form a large number of projection rows 25. Point-like projection row 2 shown in FIG.
Instead of 5, a number of protrusions extending in the width direction of the inner surface of the slide member 20 may be formed to serve as meshing portions. A shoe 27 made of an elastic material is fixed to an end of the slide member 20. Since the shoe 27 is installed on the floor surface (FIG. 1), the shoe 27 has a bottom surface 28 inclined so as to cancel the inclination of the leg 2 and make surface contact with the floor surface. As shown in FIG. 2, anti-slip irregularities 29 are formed on the inclined bottom surface 28. The mounting bracket 31 (FIG. 4) of the locking mechanism 30 has a mounting portion 32 fixed to the side surface of the leg body 20 with a rivet 39 or the like, and also functions as a support for the step frame 5 (FIG. 1). A mounting portion 33 for fixing the side surface of the step frame 5 is projected from the mounting portion 32. The angle between the mounting portions 32 and 33 is set slightly larger than 90 degrees in consideration of the lower wide state of the legs 2 and 2 (see FIG. 1).
Flanges 34, 35 for mounting the lock lever 40, which also serve as reinforcement, are provided between 2 and 33.

As shown in FIG. 4, the lock lever 40 has an arm 43 projecting from a rack shoe 42 having a plurality of projections 41 formed for engagement.
Passes between the flanges 34 and 35 and slides 20
Are provided so as to oppose the projection rows 25 of the first row. Arm 43
Are formed with anti-slip irregularities 44 on the lower surface thereof.
On the upper surface of the arm 43, there is provided a projection 46 forming a pin housing portion 45 through which a pivot pin 49 (FIG. 5) is inserted. A lock fitting 47 screwed from the lower surface of the arm 43 projects upward from the upper surface of the arm 43. The lock lever 40 is swingably attached to the mounting bracket 31 by supporting the pivot pin 49 (FIG. 5) inserted into the pin housing portion 45 by the pin hole 36 provided in the flanges 34 and 35.

On the lower surface of the mounting portion 33, a spring receiving projection 3 is provided.
7 are formed. On the lock lever 40 side, the leg of the spring receiving member 48 fixed to the lower surface protrudes upward. A compression spring 38 is interposed between the spring receiving projection 37 and the leg of the spring receiving member 48, and the elasticity of the arm 43 in the opening direction is urged by the lock lever 40 by the compression spring 38. A lock pin 50 (FIG. 4) is inserted between the flanges 34 and 35 so that the peripheral surface is located on the extension of the shaft of the lock fitting 47. Although the material of the lock pin 50 is not necessarily specified, it is preferable that the lock pin 50 be made of a soft elastic material such as a synthetic resin because it is easy to manufacture and inexpensive. Lock pin 50
, A small diameter portion 52 is formed adjacent to the large diameter portion 51. Further, a flange portion 57 is formed on one side of the small diameter portion 52. The lock pin 50 has a compression spring 38 on the peripheral surface of the large diameter portion 51 of the lock pin 50 at the lock position.
Flanges 34, 3 in a positional relationship such that
5 is attached.

A soft elastic material 53 is mounted near one end of a lock pin 50 protruding from the side surface of the flange 34. The soft elastic member 53 preferably has a tapered side surface that becomes thicker toward the end of the lock pin 50. By compressing the soft elastic material 53 between the inner wall surface of a pin hole (not shown) formed in the flange 34 and the peripheral surface of the lock pin 50, the axial movement of the lock pin 50 is suppressed, and the lock pin 50 is prevented from moving. 50 is fixed in the locked position (FIG. 8). A circumferential groove 54 is formed near the other end of the lock pin 50 protruding from the side surface of the flange 35, and the circumferential groove 5 is formed.
By fitting the retaining fitting 55 into the
The lock pins 50 inserted into the pins 4 and 35 are stopped. Lock pin 50 inserted between flanges 34 and 35
Is movable by a predetermined distance in the axial direction by the flange portion 57 and the retaining fitting 55, and moves between a lock release position (FIG. 7) and a lock position (FIG. 8). When the lock pin 50 is at the unlock position, a small space is secured between the peripheral surface of the small diameter portion 52 and the compression spring 38 as shown in FIG. Further, the distance between the tip of the leg of the lock fitting 47 and the peripheral surface of the small diameter portion 52 is large.
In this state, the lock lever 40 can swing about the pivot pin 49 by applying a finger pressure F to the tip of the arm 43 as shown in FIG.

Inside the slide member 20, a stopper 57 is fixed with a rivet. When the lock lever 40 is operated to greatly change the length of the extendable leg, the stopper stopper 57 stops when the rack shoe 42 hits the stopper 57 and the slide member 20 falls out of the leg body 10. To prevent Then, when the lock lever 40 is rotated by the finger pressure F against the resilience of the compression spring 38 that engages the engagement projection 41 with the projection row 25 of the slide member 20, as shown in FIG. The leg end of the leg 47 fits into the groove formed by the small diameter portion 52, and the meshing state between the projection row 25 and the meshing projection 41 is released as shown in FIG. As a result, the sliding member 20 is extended with respect to the leg
Can be pulled out or inserted. At this time, since the slide portion 20 moves in a state where the slide portion 22 is fitted in the guide groove 14 of the leg body 10, the slide member 20 is smoothly maintained while maintaining a predetermined positional relationship. To move.

When the finger pressure F is released after adjusting the insertion amount of the slide member 20 to the leg body 10 according to the length of the leg 2 required, the lock lever 40 is resiliently pressed by the compression spring 38. Rotate clockwise in FIG. 6,
The engagement ridge 41 is pressed against the projection row 25 of the slide member 20. As a result, the engagement ridge 41 and the projection row 25 are engaged with each other in a positional relationship where the leg 2 has a predetermined length, and the movement of the slide member 20 along the longitudinal direction of the leg body 10 is regulated. Further, the tip of the leg of the lock fitting 47 retreats from the peripheral surface of the small diameter portion 52. Next, the tip of the lock pin 50 on which the soft elastic material 53 is mounted is pushed into the flange 34 side. The pushing amount of the lock pin 50 is regulated by the fact that the flange portion 57 provided on one side of the small diameter portion 52 contacts the inner surface of the flange 35 of the mounting bracket 31. In this position, the large diameter portion 51 of the lock pin 50 faces the side surface of the compression spring 38 as shown in FIG. Here, the mounting position of the compression spring 38 is set such that the compression spring 38 is pressed against the peripheral surface of the large-diameter portion 51 by the side surface. The lock pin 50 is secured at the position. At this time, the axial movement of the lock pin 50 is also restricted by the repulsive force of the soft elastic body 53 compressed between the inner peripheral surface of the pin hole (not shown) and the peripheral surface of the lock pin 50. .

When the lock pin 50 is at the pushing position,
As shown in FIG. 8B, the tip of the leg of the lock fitting 47 is located near the peripheral surface of the large diameter portion 51. For this reason, even if an external pressure is applied to rotate the lock lever 40 counterclockwise in FIG. 6, the tip of the leg of the lock fitting 47 is pressed against the peripheral surface of the large-diameter portion 51, so that the rotation of the lock lever 40 is stopped. The engagement state between the projection row 25 of the slide member 20 and the engagement ridge 41 is not released. Therefore, the pushing amount of the slide member 20 to the leg main body 10 does not change, and the leg 2 having a constant length is maintained. When changing the length of the leg 2 from the state shown in FIG. 8, the lock pin 5 projecting sideways from the flange 35 is used.
7 is pushed into the flange 35 side, and FIG.
As shown in FIG.
To move. Then, as described above, the lock lever 4
By rotating 0, the engagement state between the projection row 25 and the engagement ridge 41 is released, and the slide member 20 is pulled out or inserted from the leg body 10 by a predetermined amount.

Thus, in the telescopic leg of the present invention,
The length of the leg 2 is adjusted almost steplessly by providing a large number of projection rows 25 on the slide member 20 and changing the projection row 25 with which the engagement projections 41 of the lock lever 40 engage. Further, in the state where the projection row 25 and the engagement projection 41 are engaged with each other, the swing of the lock lever 40 is regulated by pushing the lock pin 50 in one direction, so that even if any external force is applied, the projection row 25 The meshing state with the meshing projection 41 is not released, and the leg 2 is maintained at the set length. In addition, since the main constituent members such as the leg body 10 and the slide member 20 are made of extruded aluminum having excellent light weight, corrosion resistance, strength, and surface appearance, the worktable can be easily transported, stored, and handled. become.

[0016]

As described above, the workbench extendable leg according to the present invention can reliably lock a lock lever having a rack shoe having a projection formed with a projection row of a slide member. Inadvertent sliding of the slide member set to the insertion amount is prevented, and a worktable stably adjusted to a required work floor height is obtained. Further, in the unlocked state, since the amount of insertion of the slide member with respect to the leg body can be continuously changed, it is possible to reliably provide a working floor of a predetermined height even on floors and grounds having various undulations,
Working at heights is also safe and easy. In addition, since the main constituent members are made of extruded aluminum members excellent in light weight, corrosion resistance, durability, and aesthetic appearance, a worktable that is easy to transport, store, handle, etc. and has a good appearance can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view (a) and side view (b) of a horse with telescopic legs according to the present invention.

FIG. 2 is an exploded perspective view of a telescopic leg.

FIG. 3 is a perspective view showing an insertion portion of a slide member with respect to a leg body.

FIG. 4 is a perspective view of a locking mechanism fixed to the leg body.

FIG. 5 is a side view of a locking mechanism connected to a leg and a step frame.

FIG. 6 is a partial cross-sectional view for explaining swing of a lock lever.

FIG. 7 is a partial side view showing a positional relationship between a lock pin, a compression spring (a) and a lock fitting (b) in an unlocked state.

FIG. 8 is a partial side view showing a positional relationship between a lock pin, a compression spring (a) and a lock fitting (b) in a locked state.

[Explanation of symbols]

1: Top plate part 2: Leg part 3: Mounting bracket 4: Reinforcement member 5: Step frame 10: Leg body 11: Bracket mounting space 12: Bracket seating part 13: Rivet fixing hole 14: Guide groove 20: Slide member 21 : Side of hollow double wall structure
22: sliding part 23: side surface 24: ridge 25: ridge row 27:
Shoe 28: Inclined bottom surface 29: Non-slip projection 30: Locking mechanism 31: Mounting bracket 32, 33:
Mounting parts 34, 35: Flange 36: Pin hole
37: spring receiving projection 38: compression spring 39: rivet 40: lock lever 41: engagement projection 42:
Rack shoe 44: Anti-slip irregularities 45: Pivot pin insertion housing 46: Projection 47: Lock fitting
48: spring holder 49: pivot pin 50: lock pin 51: large diameter part 52: small diameter part
53: soft elastic body 54: groove 55: retaining fitting 56: retaining stopper 57: flange F: finger pressure D: expansion / contraction direction

Continuation of the front page (56) References JP-A-8-158767 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 1/30 E06C 1/00-7/00

Claims (3)

(57) [Claims] 1. A leg body having a rectangular internal space, a slide member inserted into the leg body, and having a plurality of projection rows formed on an inner surface along a longitudinal direction, and a side on which the slide member is inserted. An arm protrudes laterally from a mounting shoe fixed to the end of the leg body and a rack shoe formed with a plurality of protrusions pivotally pivotally attached to the mounting metal and meshing with a projection row of the slide member. A lock lever, a compression spring interposed between the mounting bracket and the lock lever, and a compression spring for urging the lock lever in a direction to press the ridges of the rack shoe on the projection row of the slide member, and in a width direction of the leg body. A lock pin that is mounted along the mounting bracket and moves between a lock position and an unlock position, and a lock bracket that protrudes upward is fixed to an arm of the lock lever. The lock pin is provided with a large diameter portion and a small diameter portion. In the lock position, the compression spring is pressed from the side by the large diameter portion of the lock pin and the protruding tip end of the lock fitting faces near the peripheral surface of the large diameter portion. A worktable telescopic leg in which a lock pin, a compression spring, and a lock fitting are positioned such that a side surface of a compression spring and a tip of a protruding portion of a lock fitting are separated from a peripheral surface of a small diameter portion of the lock pin at a release position. The mounting bracket has a mounting portion fixed to the leg body, and a mounting portion extending laterally from the mounting portion and fixing a step frame, and a pair of flanges is provided at a corner portion of both mounting portions. A lock pin having a large diameter portion and a small diameter portion is inserted into these flanges, and a flange portion that contacts the inner surface of one of the flanges and regulates the pushing amount of the lock pin is one of the small diameter portions. The telescopic leg for a worktable according to claim 1, which is provided on the side. 3. A lock fitting is mounted near one end of a lock pin protruding laterally from one flange, and a soft elastic body is fitted near another end of the lock pin protruding laterally from the other flange. 3. The workbench according to claim 2, wherein when the lock pin is in the lock position, the soft elastic body is compressed between the inner peripheral surface of the pin insertion hole formed in the other flange and the peripheral surface of the lock pin. Telescopic legs.