JPH11152892A - Handrail locking device for folding working table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handrail locking device in a simple structure for a folding working table capable of simply mounting/demounting a handrail and ensuring locking of the handrail. SOLUTION: A handrail locking member 10 is stored inside the lower end of the hollow leg 8b of an approximately inverse U-shaped handrail 8. An engagement protrusion 11 protruded outward from the front wall opening 14 of the handrail leg 8b and a disengagement protrusion 12 protruded outward from the rear wall opening 15 of the handrail leg 8b are provided at the lower end and at the upper end of the locking member 10, respectively, and the lower end of the locking member 10 is put in press contact with the front wall inner face of the handrail leg 8b with the resilient of a spring 18. The handrail leg 8b with the locking member 10 is fitted from upward to a cylindrical handrail support 20 on the side of a working table to engage the engagement protrusion 11 of the locking member 10 with the handrail support 20. In unlocking, the disengagement protrusion 12 of the locking member 10 is pushed into the leg 8b, so that the locking member 10 can be oscillated with a supporting protrusion 13 at the longitudinal middle as a supporting point to disengage the engagement protrusion 11 from the handrail support 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a handrail lock device for a folding workbench.

[0002]

2. Description of the Related Art Conventionally, in order to attach a substantially inverted U-shaped handrail to a worktable, a rectangular cylindrical handrail receiver for receiving the lower end of the vertical leg of the handrail is provided on the worktable. Generally, the handrail is detachably attached to the worktable by fitting the lower end portion into the handrail receiver.

[0003]

In the conventional handrail mounting method, the handrail can be mounted simply by fitting the lower ends of the leg portions of the handrail into a cylindrical handrail receiver, and the handrail can be removed from the workbench only by lifting the handrail upward. However, there is an advantage that the attachment and detachment are easy, but there is a problem that it is dangerous because the handrail is easily pulled out.

By the way, it is possible to prevent the handrail from coming off by using a clamp, a bolt and a nut. However, since a separate operation is required, there is a problem that the handrail is difficult to attach and detach. .

An object of the present invention is to solve the above-mentioned problems of the prior art, and to detachably attach a lower end of a leg of a substantially inverted U-shaped handrail to a cylindrical handrail receiver provided on a workbench side. , Easy to put on and take off, and keeps the handrail from slipping out (lock)
It is an object of the present invention to provide a handrail lock device in a folding workbench which is very convenient and has a simple structure.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a handrail lock device in a folding workbench according to the present invention is provided inside each lower end of a hollow leg of a substantially inverted U-shaped handrail. A handrail lock member is housed therein, and at the lower end of the lock member, an engagement projection is provided which protrudes outward from an opening formed in the front wall of the handrail leg, and a handrail leg is provided at the upper end of the lock member. A projection for engaging and disengaging protruding outward from an opening formed in a rear wall of the handrail portion is provided at an intermediate portion of the height of the lock member, and a fulcrum projection for abutting against the inner surface of the front wall of the handrail leg. The lower end of the lock member is pressed against the inner surface of the front wall of the handrail leg by the spring force of the spring, and the handrail leg is attached to a cylindrical handrail receiver provided on the workbench side. As it is fitted from above, it protrudes outward from the front wall opening of the handrail leg. The leading end of the engaging projection at the lower end of the locking member is engaged with the handrail receiver, and is used for releasing the engagement that projects outward from the rear wall opening of the handrail leg when the handrail is removed. When the convex portion is pushed into the leg side, the lock member swings around the fulcrum projection as a fulcrum, so that the tip of the engaging convex portion of the lock member is disengaged from the handrail receiver. It is characterized by having.

According to the handrail lock device for a folding workbench of the present invention, when each leg of the substantially inverted U-shaped handrail is attached to a cylindrical handrail receiver provided on the workbench side,
It is only necessary to fit the lower end of the leg of the handrail into the handrail receiver from above. As a result, the distal end of the engaging projection at the lower end of the lock member projecting outward from the front wall opening of the handrail leg is further projected outward from the front wall opening of the cylindrical handrail receiver. The distal end of the engaging projection is engaged with the front wall of the cylindrical handrail receiver, and the handrail leg is locked when fitted into the cylindrical handrail receiver.

On the other hand, when removing the handrail, the disengagement projection projecting outward from the rear wall opening of each leg of the substantially inverted U-shaped handrail is pushed into the inside of the leg. Just good. As a result, the lock member swings with the fulcrum projection as a fulcrum, and the leading end of the engagement convex portion of the lock member enters the handrail receiver through the front wall opening of the cylindrical handrail receiver, and the handrail leg is moved. Is unlocked.

Accordingly, the operation of attaching and detaching the handrail to and from the workbench is very simple, and the handrail can be reliably prevented from being locked (locked), which is very convenient. In addition, since the handrail lock device has a simple structure, there is an effect that manufacturing costs can be reduced.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

In this specification, front and rear, left and right, and up and down are based on FIG. 2, the front means the left side of FIG. 2, the rear means the right side, and the left and right refer to the rear.
The upper part means the upper side of the figure, and the lower part means the lower side.

Referring first to FIGS. 1 and 2, the foldable worktable is made of an aluminum alloy, which is a foldable worktable body (1), and front left and right supports of the worktable body (1).
Left and right ramp handrails attached along (3) (8A)
And right and left scaffolding handrails (8B) and rear scaffolding handrails (9) attached so as to surround the scaffold plate (2) of the workbench body (1) from the left, right, and three sides.

The workbench body (1) is a substantially square scaffold plate.
(2), left and right inclined front struts (3), which support the front edge of the scaffold plate (2) and are made of rectangular pipes having a rectangular cross section, and front struts.
(3) Left and right rear supports consisting of rectangular pipes with a rectangular cross section that support the rear edge of the scaffold plate (2) with a slope that is more vertical than
(4) and the left and right lower reinforcements passed between the middle of the height of the left and right front struts (3) and the lower ends of the left and right rear struts (4)
(6), left and right front supports (3) near the upper end and scaffolding board (2)
Left and right foldable upper reinforcements (7) passed between the rear edge portions. Between the left and right front struts (3), three steps (taraps) (5) are suspended at predetermined intervals, and at the lower ends of the left and right rear struts (4),
Each caster (30) is provided so as to protrude rearward.
The structure of the workbench body (1) will be described later in detail.

Next, the handrails (8A), (8B), and (9) are all made of square pipes and have a substantially inverted U-shape. The left and right scaffold handrails (8B) are detachably attached to the workbench body (1) by the handrail lock device of the present invention, and the rear scaffold handrail (9) is passed and attached to the left and right scaffold handrails (8B). Have been.

Here, the ramp handrail (8A) is a handrail grip (8a) parallel to the front support (3) inclined rearward and upward.
And a downwardly extending leg (8b) extending downward from both front and rear ends of the handrail grip (8a), thereby forming a substantially inverted U-shape. The left and right scaffolding handrails (8B) each have a horizontal handrail gripper (8a),
The handrail gripping portion (8a) has a substantially inverted U-shape with a downwardly extending leg portion (8b) extending downward from both front and rear ends. The rear scaffolding handrail (9) has a horizontal handrail grip (9a) and a hanging leg (9) that extends below both left and right ends of the handrail grip (9a).
b) has a substantially inverted U-shape.

Referring to FIG. 1, FIG. 2 and FIG. 5, the rear scaffolding handrails (9) have their legs (9b) near the upper end and the lower end in a substantially inverted manner as viewed from the side surface opened forward. Mounting brackets (35) each having a shape notch (36) are provided, and bolts (37) are attached to the corresponding portions of the legs (8b) of the left and right scaffolding handrails (8B). Then, with the rear scaffolding handrail (9) passed to the left and right scaffolding handrails (8B), the bolts (37) on the leg (8b) side of the left and right scaffolding handrails (8B) are attached to the brackets.
The bracket (35) is fitted into the notch (36) of the (35).
The rear scaffolding handrail (9) is detachably attached by being hooked on the bolt (37).

The front and rear legs (8b) of the left and right scaffolding handrails (8B).
In addition, an intermediate reinforcing cross member (33) and a baseboard (34) are fixed to the left and right legs (9b) of the rear scaffolding handrail (9), respectively.

Next, the handrail lock device in the folding workbench of the present invention will be described in detail with reference to FIGS.

At the lower end and the upper end of the front support column (3) of the worktable body (1), a short rectangular cylindrical handrail receiver (8A) for receiving the lower end of the leg (8b) of the ramp handrail (8A). 20) are fixed to each other, and the upper end of the front support (3) and the upper end of the rear support (4) have short rectangular tubular shapes that receive the lower ends of the legs (8b) of the left and right scaffolding handrails (8B). The handrail receiver (20) is fixed.

The ramp handrail (8A) and the left and right scaffolding handrails (8B) are detachably attached to the workbench body (1) by the handrail lock device of the present invention. Since they are the same,
(8A) and handrails (8) including both left and right scaffolding handrails (8B)
And will be described.

As shown in the figure, in the handrail (8), that is, the ramp handrail (8A) and the left and right scaffold handrails (8B), a lock member (10) is attached to the lower end of the front and rear leg (8b) of the handrail (8). ) Are disposed in opposite directions so that the disengagement projections (12) project inside the handrail (8).

FIGS. 3 and 4 show a handrail receiver (20) fixed to the upper end of the front support (3) and a front leg of the right scaffolding handrail (8B).
(8b) The state of connection with the lock member (10) provided at the lower end is shown, and the structure of the handrail lock device will be described based on this.

That is, the handrail lock device is provided with a handrail lock member inside each lower end of the hollow leg (8b) of the substantially inverted U-shaped handrail (8).
(10) is stored. The lock member (10) is made of, for example, an aluminum alloy, and includes a substantially vertical lower end portion (10a), a rear upper inclined portion (10b), and an intermediate connecting portion (10c) connecting these. It is configured. An engaging projection (11) is provided at a lower end (10a) of the lock member (10) so as to project outward from an opening (14) opened in the front wall of the handrail leg (8b). I have. At the lower part of the front surface of the engaging projection (11), there is provided a guide surface portion (11a) having an arc-shaped cross-section toward the inside of the handrail leg (8b) toward the lower end. At the upper end of the lock member (10), a disengagement projection (12) projecting outward from an opening (15) formed in the rear wall of the handrail leg (8b) is provided. A contact projection (16) is provided near the lower side of the engagement release projection (12). Further locking members
A recess (19) is provided on the front surface of the intermediate connecting portion (10c) of (10), and the upper end of the recess (19), that is, the lock member (10) is provided.
A fulcrum projection (13) that contacts the inner surface of the front wall of the handrail leg (8b) at the boundary between the inclined upper part (10b) and the intermediate connecting part (10c).
Are formed. Also, the lower end (10a) of the lock member (10)
On the rear surface, a projection (17) for coil spring positioning is provided,
A coil spring (18) is interposed between the lower end of the lock member (10a) and the inner surface of the rear wall of the handrail (8b) with the front end of the coil spring (18) fitted and covered. ing. As a result, the lower end portion (10a) of the lock member (10) and the fulcrum projection (1
3) are pressed against the inner surfaces of the front walls of the handrail legs (8b) by the resilient force of the coil springs (18), and the engagement protrusions (11) of the lower end (10a) of the lock member (10) are pressed. , Protruding outward from an opening (14) formed in the front wall of the handrail leg (8b).

On the other hand, the handrail receiver (20) is substantially in the shape of a rectangular tube, and has an opening (21) at the lower end of its front wall (20a).
In addition, the left side wall (20b) and the right side wall (2
A rivet (22) as a handrail leg lower end support stopper is interposed between the rivet and the rivet (22). Head of rivet (22)
(22a) is in contact with the outer surface of the left side wall (20a) at the lower end of the handrail receiver (20), and the tip of the rivet (22) is in contact with the right side wall (20c) at the end of the handrail receiver (20). It penetrates and is expanded for latching. Thick hollow portions (23) for reinforcement are provided on the front and rear sides of the right side wall portion (20c) of the handrail receiver (20).

Referring to FIGS. 1, 2 and 5, the scaffold plate (2) of the workbench body (1) is attached to the rectangular scaffold plate body (2a) and the left and right sides thereof. And a side frame member (24). The upper half of the side frame member (24) is provided with a main body holding portion (24a) having a vertical U-shaped cross section, into which the left and right edges of the scaffold plate main body (2a) are fitted. Scaffold board
The front edge of (2) is received by the uppermost step (5) which is held between the upper ends of the left and right front supports (3). The rear edge of the scaffold (2) is pinned (26) on the upper end of the rear support (4).
It is mounted so as to be able to swing freely through. Side frame member (24)
The lower half is cut out so as not to interfere with the top step (5).

At the upper ends of the left and right front supports (3), a plate-like scaffold plate attaching member (25) is fixed in a protruding rearward direction. The front end of the lower half of the frame member (24) is swingably attached via a pin (26).

In the middle of the height of the left and right front supports (3), a plate-like lower reinforcing member mounting bracket (27) is fixed in a protruding rearward direction. Lumber (6)
Is pivotally mounted via a pin (26). A lower reinforcement mounting bracket (27) of the same shape is fixed to the lower ends of the left and right rear supports (4) so as to protrude forward. The lower reinforcement (6) has a lower end attached to the bracket (27). The part is swingably attached via a pin (26). Reinforcing cross members (28) are interposed between the upper end portions and the lower end portions of the left and right lower reinforcing members (6).

Near the upper ends of the left and right front supports (3), a plate-like upper reinforcing member mounting bracket (29) is fixed so as to project rearward, and the lower half of the side frame member (24) is fixed. On the inner surface near the rear end of the section, there is an upper reinforcement mounting bracket of the same shape (29)
Has been fixed.

The upper reinforcing material (7) has a lower end at the front support (3).
A front column side reinforcing piece (7a) that is swingably attached to the upper reinforcing member mounting bracket (29) on the side via a pin (26),
The upper end is the upper reinforcement mounting bracket (2
9) a scaffold plate-side reinforcing piece (7b) that is swingably attached via a pin (26).

As shown in FIG. 6, the front support column side reinforcing piece (7a)
The upper end and the lower end of the scaffold plate-side reinforcing piece (7b) are overlapped so that the front column-side reinforcing piece (7a) is on the outside, and the left and right overlapping parts are connected to the connecting pipe (31). It is foldably connected to a navelette (32) driven into the opening at both ends of the rivet.

The scaffold plate-side reinforcing piece (7b) has an inverted J-shape in vertical section, and the front support column-side reinforcing piece (7a) and the scaffold plate-side reinforcing piece (7b).
At the connecting portion with (7b), the top of the scaffold plate side reinforcing piece (7b)
(7c) comes into contact with the front pillar side reinforcing piece (7a) from above. The two reinforcing pieces (7a) and (7b) can be folded in a direction in which they are in a straight V-shape from a state in which they are straight.

According to the handrail lock device of the present invention,
To attach each leg (8b) of the substantially inverted U-shaped handrail (8) to a cylindrical handrail receiver (20) provided on the workbench body (1) side, as shown in FIG. It is only necessary to fit the lower end of the leg (8b) of (8) into the handrail receiver (20) from above. This allows
A guide surface portion (11a) having an arc-shaped cross section of an engagement projection (11) of a lower end (10a) of a lock member (10) projecting outward from a front wall opening (14) of a handrail leg (8b). ) Is cylindrical handrail holder (20)
Is pressed against the front wall (20a), and the engaging projection (11) is once pushed into the inside of the handrail leg (8b) against the elastic force of the coil spring (18). At this time, the lock member (10) swings around the intermediate fulcrum projection (13) as a fulcrum, and furthermore, engages with the engagement projection (1).
When 1) reaches the front wall opening (21) of the cylindrical handrail receiver (20), it is made to protrude further outward from this opening (21). Therefore, in this protruding state, as shown in FIG.
The upper end of the engaging projection (11) is the front wall (20a) of the cylindrical handrail receiver (20).
Cylindrical handrail receiver that is engaged with the upper edge of the opening (21)
The handrail leg (8b) is locked in the state of being fitted into (20).

When removing the handrail (8), use the handrail.
It is only necessary to push the engagement release projection (12) projecting outward from the rear wall opening (15) of the leg (8b) of (8) into the inside of the leg (8b). As a result, as shown in FIG. 4B, the lock member (10) swings around the fulcrum projection (13) in the middle of the lock member (10), and the engagement protrusion (11) of the lock member (10) is rotated. The leading end enters the handrail receiver (20) through the front wall opening (21) of the cylindrical handrail receiver (20), and the handrail leg (8b) is unlocked.

Therefore, the handrail (8) with respect to the workbench body (1)
The handrail is very easy to attach and detach, and the handrail leg (8b) can be reliably locked (locked), which is very convenient.

In the above description, the lock member (10) at the lower end of the front leg (8b) of the right scaffolding handrail (8B) and the handrail receiver (20) at the upper end of the front support (3) have the structure of a handrail lock device. The right leg scaffolding handrail (8B) has the opposite rear side
(8b) In the case of connection between the lock member (10) at the lower end and the handrail support (20) at the upper end of the rear support (4), the operation of the lock device is reversed in the above-described case.

When the workbench body (1) is folded, first, the upper reinforcing member (7) is folded in an inverted V-shape in the middle thereof, and the rear edge portion and the lower reinforcing member of the scaffold plate (2) are reinforced. Lumber
When the lower end of (6) is brought closer to the front support (3), the scaffold plate (2) and the rear support (4) become almost straight, and the workbench body (1) can be folded. (See FIG. 7).

Here, the front edge of the scaffold plate (2) and the front support
Since the pin joint point with (3) is located behind the center line of the front support (3), the scaffold plate (2) and the front support (3) are not inverted V-shaped but parallel to each other. Become. As a result, the front strut
(3) is parallel to the scaffold (2) and the rear strut (4),
The lower stiffener (6) is between the front strut (3) and the rear strut (4),
The upper stiffener (7) fits between the front column (3) and the scaffold (2), respectively, and the workbench body (1) is compactly folded.

The total length of the scaffold plate (2) and the rear support (4) is longer than the length of the front support (3). The lower end position of the column (3) is above the lower end position of the rear column (4). Therefore, the casters (30) can be accommodated in the space below the lower end of the front support (3) when the folded workbench bodies (1) are overlapped with each other.

Note that the rear scaffolding handrail (9) is
A bracket (35) having a notch (36) fixed at a predetermined position in (b) is detachably attached to the legs (8b) of the left and right scaffolding handrails (8B) by being hung on bolts (37). ing.

Therefore, each of the handrails (8A), (8B) and (9) can be detached and disassembled with respect to the workbench body (1). As shown in FIG. Handrail (8A) (8
B) (9) can be compactly assembled with the workbench body (1).

The mounting directions of the lock member (10) on the leg (8b) side of the handrail (8) and the handrail receiver (20) on the workbench body (1) are not limited to those shown in the drawings. Either direction can be used.

Although the illustrated handrail (8) is made of a square pipe, the cross-sectional shape of the handrail (8) is as follows.
Of course, other shapes such as a circle and an ellipse may be used. Correspondingly, the cross-sectional shape of the handrail receiver (20) can also be an appropriate shape that can fit the lower end of the leg (8b) of the handrail (8).

The handrail (8) usually has an inverted U-shape, but is not limited to this. In short, these handrails (8)
May be composed of a handrail gripping portion (8a) and a plurality of legs (8b) that are vertically connected to the handrail gripping portion (8a). Therefore handrail
In (8), one or both ends of the handrail grip (8a) are further extended in the longitudinal direction, and the leg (8b) is attached to the handrail grip (8a).
May be provided in the middle part of the length.

[Brief description of the drawings]

FIG. 1 is a perspective view of a folding workbench showing an embodiment of the present invention.

FIG. 2 is a right side view of the same.

FIG. 3 is an enlarged exploded perspective view showing a handrail lock device provided in the folding workbench of FIG. 1;

4A and 4B are vertical cross-sectional views of the handrail lock device. FIG. 4A shows a locked state of a handrail leg, and FIG. 4B shows a state of unlocking of the handrail leg.

FIG. 5 is an enlarged right side view of a main part of the work table of FIG. 2;

FIG. 6 is an enlarged sectional view of a main part along line AA of FIG. 5;

FIG. 7 is a side view showing the disassembled and folded state of the folding work table.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 workbench main body 2 scaffold plate 3 front support 4 rear support 8 substantially inverted U-shaped handrail 8A ramp handrail 8B left and right scaffold handrail 8a handrail 8b leg 9 substantially inverted U-shaped rear scaffold handrail 10 handrail lock member 11 engaging protrusion DESCRIPTION OF SYMBOLS 12 Disengagement convex part 13 Support point projection 14 Leg front wall lower opening 15 Leg rear wall upper opening 18 Coil spring 20 Cylindrical handrail receiver 21 Handrail receiving front wall opening

Claims (1)

[Claims] 1. A handrail lock member (10) is housed inside each lower end of a hollow leg (8b) of a substantially inverted U-shaped handrail (8).
At the lower end of (10), there is provided an engagement projection (11) projecting outward from an opening (14) opened in the front wall of the handrail leg (8b), and the locking member (10) At the upper end, a disengaging projection projecting outward from an opening (15) opened in the rear wall of the handrail leg (8b)
A fulcrum projection (13) is provided at an intermediate portion of the height of the lock member (10), and abuts against the inner surface of the front wall of the handrail leg (8b).
The lower end of the lock member (10) is pressed against the inner surface of the front wall of the handrail leg (8b) by the elastic force of the spring (18), and the leg (8b) of the handrail (8) is provided. Is fitted into the cylindrical handrail receiver (20) provided on the workbench side from above, so that the locking member () protrudes outward from the front wall opening (14) of the handrail leg (8b). 10) The tip of the engagement projection (11) at the lower end is
A disengagement projection (12) which is engaged with the handrail receiver (20) and projects outward from the rear wall opening (15) of the handrail leg (8b) when the handrail (8) is removed. Is pushed into the leg (8b) side, the locking member (10) swings around the fulcrum projection (13) as a fulcrum, and the tip of the engaging projection (11) of the locking member (10). A handrail lock device for a foldable workbench, in which the part is disengaged from the handrail receiver (20).