JP3465181B2 - Hook device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook device used for assembling a temporary scaffolding at a construction site, a prefabricated workbench, or the like.

[0002]

2. Description of the Related Art Such a hook device is fixed to a temporary scaffold or a workbench by fixing one to each end of a pipe or one pair to each end of a scaffold plate. The hook body is detachably fitted to the fitted member from above, and the hook body has an inverted U-shaped inner peripheral surface which is fitted to the fitted member by the upper wall and the front and rear walls. A hooking prevention engaging portion that is disposed in the provided stopper arranging space and that projects from the lower end of the rear wall of the hook body toward the lower end of the front wall to prevent the hook body from coming off from the fitted member. The stopper is separated from the removal prevention position with respect to the lower end of the front wall and is movable to a removal permission position that allows the hook body to be removed from the fitted member, and the stopper is on the removal prevention position side. An elastic member that urges the By being connected to the left and right side surfaces of the topper arranging space and consisting of a connecting pin that integrates the hook body, the stopper and the elastic member, the intermediate portion of the connecting pin is loosely inserted into the through hole provided in the stopper, It is known that the stopper is rotatable about the axis of the connecting pin.

[0003]

Although the stopper of the conventional hook device is necessary for safety, it has been an obstacle to the work when disassembling the temporary scaffold. That is, when removing the pipe or scaffolding plate provided with these hook devices, it is necessary to move the stopper to the withdrawal allowable position against the biasing force of the elastic member, but the stopper is
Although it does not move while holding it by hand, it returns to the slip-out prevention position side if the hand is released, so there is a problem that the scaffolding and workbench cannot be disassembled by one person and workability is poor.

An object of the present invention is to provide a hook device capable of improving workability when assembling a temporary scaffolding at a construction site, an assembly worktable or the like.

[0005]

A hook device according to the present invention comprises a hook body having an inverted U-shaped inner peripheral surface formed by an upper wall and front and rear walls to be fitted to a member to be fitted. The hook main body is provided in a stopper disposing space provided in the hook main body, and has a slip-out preventing engagement portion that projects from the lower end of the rear wall of the hook main body toward the lower end of the front wall to prevent the hook main body from slipping out of the fitted member. The stopper is separated from the slip-out prevention position with respect to the lower end of the front wall and can be moved to the slip-out allowable position that allows the hook body to slip out of the mated member, and the stopper is the slip-out prevention position. In a hook device including an elastic member biased to the side and a connecting pin that is held between the left and right side surfaces of the stopper placement space and that integrates the hook body, the stopper, and the elastic member, the hook device is connected to the stopper. An elongated hole is provided through which the intermediate part of the pin is inserted.The elongated hole is continuous with the stopper guide part for moving the stopper between the removal prevention position and the removal allowable position and the stopper guide part. Ri Na more and the connecting pin and the portion of the stopper lock mutually engaged when moving further off preventing position opposite from the allowable position leaves the stopper projection is provided on the left and right sides of the stopper hook
The body, in which guide grooves for guiding the respective projection is characterized that you have provided.

When the hook device of the present invention is fitted to a member to be fitted which has a circular cross section, the stopper disengagement preventing engagement portion is once pushed by the member to be fitted and is moved from the disengagement prevention position to the disengagement allowable position. When the hook body moves and fits into the fitted member, the hook body is urged by the elastic member to return to the slip-out preventing position. Then, when the stopper is moved further to the opposite side of the slip-out prevention position from the slip-out prevention position, the connecting pin fits into the stopper lock part of the long hole, and the stopper prevents the movement while allowing the slip-out. To be done. That is, the hook device can be easily removed from the fitted member. Therefore, when removing the pipes or scaffolding plates that are fixed to both ends by these hook devices, the stoppers of the hook devices must be prevented from moving at the removal allowance position before the entire pipe or scaffolding plate is lifted. If so, these can be easily removed. Further , since the protrusions are provided on the left and right side surfaces of the stopper and the hook body is provided with the guide groove for guiding each protrusion, in addition to the long hole of the stopper being guided to the connecting pin, the stopper protrusion is The stopper moves smoothly because it is guided in the guide groove of the hook body.

Further, the elastic member is a double torsion type torsion coil spring, a connecting pin is inserted into the coil portion, and an end portion on the connecting side is hooked on an engaging portion provided on the hook body, It is preferable that each free-side end portion is pressed against the protrusion of the stopper so as to urge the stopper toward the removal preventing position side. By doing this, appropriate elastic force is applied to the stopper, and the hook body,
The stopper and the elastic member can be easily integrated by the connecting pin.

Further, the stopper is provided with a lock releasing operation portion projecting upward from the stopper arranging space, and by moving the lock releasing operation portion to the slip-out preventing position side, the stopper lock portion is moved. It is preferable to be able to move the connecting pin that is fitted in the stopper guide portion into the stopper guide portion. With this configuration, the stopper can be easily returned to the slip-out prevention position side.

Further, there is further provided a stopper returning means for moving the lock releasing operation portion of the stopper to the removal preventing position side when the hook body is removed from the fitted member or when the hook body is fitted to the fitted member. It is preferably provided. With this configuration, the stopper once positioned on the slip-out allowance position side returns to the slip-out prevention position when the hook body is fitted to the fitted member, so that the stopper unlocking operation portion can be manually operated. You don't have to move it,
In addition, it is possible to eliminate the unsafe use state in which the hook body is fitted to the fitted member in the state where the stopper is on the removal allowable position side.

The stopper return means comprises an elastic member, a stopper return lever for transmitting the elastic force of the elastic member to the stopper, and a swing shaft for swinging the stopper return lever. It is preferable that a stopper pushing portion that opposes from below is provided on the stopper at the slip-out allowing position in the state of being fitted to the fitted member, and that the elastic force is applied to the lower end portion of the stopper return lever. With this configuration, when the hook body is removed from the fitted member, the stopper return lever swings about the swing shaft by the elastic force of the elastic member. As a result, the stopper pushing portion of the stopper return lever gives an upward force to the stopper, that is, a force in the direction of moving the lock releasing operation portion to the slip-out prevention position side, and this force moves the stopper to the slip-out prevention position side. .

It is preferable that the swing shaft is provided close to the stopper pushing portion. By doing this, the elastic force of the elastic member can be amplified and transmitted to the stopper,
The stopper can be moved to the slip-out prevention position side with a small elastic force.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the following description,
1 and therefore the top and bottom of FIG. 4 and FIG. 8, and the front means
The left side and the rear side in the figure refer to the right side in the figure, and the left and right sides refer to the front side.

The hook device (1) of the present invention is used when assembling a scaffold or the like so that it can be disassembled. For example, as shown in FIG. 1, the hook device (1) is provided at the front and rear ends of a circular pipe (2). Attached members that are attached and are adjacent to each other in the front and back
(3) is detachably fitted into each. Below,
The front hook device (1) will be described.

2 to 7 show the hook device (1) of the first embodiment. As shown in the figure, the hook device (1) of the first embodiment includes a hook body (4) fitted to a fitted member (3) and a hook body (4) fitted to the fitted member (3). ), The stopper (5) that can move between the removal prevention position and the removal allowance position that allows this, and the elastic member (6) that urges the stopper (5) toward the removal prevention position.
It consists of a hook body (4), a stopper (5) and a connecting pin (7) that integrates the elastic member (6).

The hook body (4) has an inverted U-shape and opens downward, and has a semi-cylindrical inner peripheral surface (4a) which fits exactly in the upper half of the fitted member (3), and a semi-cylindrical inner surface (4a). It has front and rear vertical inner peripheral surfaces (4b) and (4c) connected to the lower side of the cylindrical inner peripheral surface (4a). The lower end of the front wall (10) of the hook body (4)
It is projected downward from the lower end of 1). Hook body
A cylindrical portion (8) having an axis extending in the front and rear direction is integrally provided on the rear surface of the (4), and the cylindrical portion (8) is inserted and joined to the front end portion of the pipe (2).

In the rear half of the hook body (4), there is provided a stopper locating space (9) which penetrates the hook body in the vertical direction and accommodates the stopper (5) movably. Near the rear end of the upper wall (12) of the hook body (4), the space for stopper placement
A connecting pin insertion hole (14) is provided which extends from the left and right side surfaces of the (9) to the left and right sides and penetrates the upper wall (12) of the hook body (4). The connecting pin (7) has an intermediate portion in the stopper disposing space (9), and the left and right ends are tightly fitted in the connecting pin insertion hole (14).

The stopper (5) has an upper half portion (5a) having an unlocking operation portion (22) at its upper end, which protrudes above the stopper disposing space (9) when it is in the disengagement allowance position, and a stopper. It is composed of a lower half portion (5b) having at its lower end a slip-out preventing engagement portion (21) projecting downward from the stopper arrangement space (9) when in the prevention position.

In the upper half (5a) of the stopper (5), there is an elongated hole (23) penetrating the stopper (5) in the axial direction (horizontal direction) of the hook body (4).
Is provided. The middle portion of the connecting pin (7) is inserted into the long hole (23), and the connecting pin (7) moves relatively within the range regulated by the wall surface of the long hole (23), so that the stopper (5 ) Is movable with respect to the hook body (4). The long hole (23) is a semi-cylindrical inner peripheral surface (4a) of the hook body (4).
The linear stopper guide portion (24) that is long in a direction substantially orthogonal to the radial direction of the stopper, and the stopper lock portion (25) that extends approximately 120 ° outwardly from the lower end of the stopper guide portion (24). And consists of. The stopper guide part (24) is for moving the stopper (5) between the removal prevention position and the removal allowance position, and the stopper lock part (25) is for moving the stopper (5) from the removal allowance position. This is to prevent returning to the slip-out prevention position.

The lower half of the stopper (5) is fitted into the circular through hole provided at the substantially central portion of the lower half (5b) of the stopper (5) by protruding both ends of the spring pin. Protrusions (26) projecting in the axial direction of the hook body (4) are formed on both left and right side surfaces of the portion (5b). Then, the vertical guide groove (13) for guiding the left and right protrusions (26)
Are provided on the left and right side surfaces of the stopper arrangement space (9) of the hook body (4). The depth (width in the front-rear direction) of the guide groove (13) is larger than the diameter of the protrusion (26), and the protrusion (26) can move slightly back and forth within the guide groove (13).

The elastic member (6) is one end portion (6a) of two torsion coil springs each having a coil portion (6c) of one turn.
It is a double torsion type torsion coil spring in which the two are connected, the connecting pin (7) is inserted through the coil portion (6c), and the end portion (6a) on the connecting side is provided on the hook body (4). Hooked to the engaging part (15), each free side end (6b),
The projection (26) of the stopper (5) is pressed against the stopper (5) toward the slip-out prevention position side. Connecting end (6a)
The angle formed between the free end and each end (6b) is about 110 ° in the free state, and the elastic force of the stopper (5) is set to be almost 0 when the stopper (5) is at the pullout prevention position. ing.

As shown in FIG. 4, the lower half portion (5b) of the stopper (5) is vertical and the upper half portion (5a) of the stopper (5) is vertical with respect to the vertical direction in the slip-out preventing position. And is inclined forward by about 35 °. The stopper (5) has an engagement prevention part (21) that protrudes downward and forward from the lower end of the rear wall (11) and contacts the lower right part of the mated member (3) to hook it. Body
Part of the opening in (4) is blocked. Then, the arc-shaped upper end surface of the stopper guide portion (24) of the elongated hole (23) is connected to the connecting pin.
(7) Engages with the upper half of. Stop from this position
(5) The engaging part (21) for preventing the slip-off is attached to the front wall (1
When moved in a direction away from (0), the stopper guide portion (24) moves diagonally upward with respect to the connecting pin (7), and the protrusion (26) of the stopper (5) moves upward, resulting in elasticity. The downward biasing force of the member (6) increases. Here, the slip-out prevention engagement part (2
If the amount of withdrawal into the stopper arrangement space (9) in 1) is within the specified range, the stopper (5) engagement prevention part (21)
Is returned to the removal preventing position by the downward biasing force of the elastic member (6).

Next, referring to FIGS. 6 and 7, the first
The operation of fitting and removing the hook device (1) of the embodiment will be described.

As shown in FIG. 6, when the hook body (4) is fitted onto the fitted member (3), the stopper preventing engagement portion (21) of the stopper (5) is engaged with the fitted member (3). Is pushed back to the slip-out allowable position shown by the solid line in FIG. At this disengagement allowable position, the connecting pin (7) is located near the lower end of the stopper guide portion (24) of the slot (23), and the same portion (24)
It is possible to move in either direction up or down.
Further, the elastic force of the elastic member (6) for moving the protrusion (26) downward is increased as the protrusion (26) moves upward. Therefore, the hook body (4) and the mated member
(3) fits together as shown by the chain line in the figure, and the connecting pin (7) moves relatively upwards along the stopper guide portion (24) of the slot (23). Move and stop
(5) returns to the slip-out prevention position shown by the chain line in the figure. In this way, the hook device (1) can be easily fitted to the fitted member (3).

When the engagement preventing portion (21) of the stopper (5) is further forcibly pushed into the stopper locating space (9) from the above state, the connecting pin (7) becomes a long hole (23). To the lower end of the stopper guide part (24) of the stopper lock part (25)
7 into the state shown in FIG. In this state, the elastic force of the elastic member (6) tries to move the protrusion (26) downward, but the connecting pin (7) cannot move along the long hole (23), so that the stopper (5) is moved. The stopper (5) is locked as it is prevented from returning to the slip-out prevention position. Thus, the hook device (1) can be easily removed from the fitted member (3). In addition, the stopper (5) at the slip-out prevention position shown by the chain line in FIG.
Can move in the direction of pulling up as shown by the arrow in the figure, but since it cannot move straight forward in the horizontal direction, the stopper (5) cannot be moved by mistakenly moving the unlocking operation part (21). It does not move to the slip-out prevention position side.

In order to return the stopper (5) to the slip-out preventing position, the connecting pin (7) should be attached to the stopper guide portion (2) of the slot (23).
4) Move it inside, this is the unlocking operation part
This is achieved by moving (22) backward. In addition,
Instead of moving the unlocking operation part (22) backward,
The same effect can be obtained by moving the slip-off preventing engagement portion (21) forward. In this way, by returning the stopper (5) to the slip-out prevention position, the stopper (5) is held in the slip-out prevention position when the hook body (4) is fitted again to the mated member (3). It

In the hook device (1) of the first embodiment described above, since the stopper (5) can be locked at the withdrawal allowable position, the hook body (4) is fitted to the fitted member (3). At this time, the stopper (5) may remain locked at the slip-out allowing position. In this case,
There is a possibility that the hook device (1) may come off when something hits it from below. The hook device (31) which solves this problem and does not come off due to human error or malfunction will be described below. In the following description, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

The hook device (31) of the second embodiment shown in FIGS. 8 to 10 is different from the hook device (1) of the first embodiment in that the hook body (32) is fitted into the fitted member (3). It further comprises a stopper return means (33) for moving the lock releasing operation portion (22) of the stopper (5) to the slip-out prevention position side when removing the stopper.

The stopper return means (33) includes a compression coil spring (elastic member) (34), a stopper return lever (35) for transmitting the elastic force of the compression coil spring to the stopper (5), and a stopper return lever.
It consists of a swing shaft (36) that swings (35).

The front wall (37) of the hook body (32) is thicker than that of the first embodiment, and the front wall (37) to the upper wall
A restoring means accommodating recess (39) opening toward the fitted member (3) is provided up to (38). Then, the inverted U-shaped inner peripheral surface (32a) (32) fitted to the fitted member (3) by the front wall (37), the upper wall (38) and the rear wall (11) of the hook body (32).
b) (32c) is formed.

The stopper return lever (35) is provided on the hook body (3
When the member (2) is fitted to the member (3) to be fitted, it has a length extending from the top of the member (3) to the equator.
The portion that abuts on the top of the fitted member (3) is a stopper pushing portion (40) that faces the stopper (5) at the slip-out allowing position from below. Further, the entire surface of the portion corresponding to the equator is not in contact, but the upper surface of the arcuate section in cross section at the tip of the obliquely downward protruding portion (41) is in contact.

The swing shaft (36) is loosely inserted into a through hole (42) formed near the upper end of the stopper return lever (35), and its left and right ends are fixed to the hook body (32). . Swing axis
The center of (36) is provided slightly above the top of the fitted member (3) and in front of it.

The compression coil spring (34) includes a spring receiving recess (43) and a stopper return lever (33), which are provided at the lower end of the return means receiving recess (39) of the hook body (32) and are inclined downward. It is received by an obliquely upward spring receiving recess (44) provided at the lower end, and pushes the lower end of the stopper return lever (33) obliquely downward. The stopper pushing portion (40) of the stopper return lever (33) is provided close to the swing shaft (36).
The position of the stopper return lever (33) biased by the compression coil spring (34) is located away from the swing shaft (36), and the stopper return lever (33) is a compression coil spring. The elastic force of (34) can be amplified and transmitted to the stopper (5).

FIG. 8 corresponds to the slip-out prevention position shown in FIG. 4 of the first embodiment. As described above, the stopper (5) is moved to the slip-out prevention position by the downward biasing force of the elastic member (6). Is held. The stopper return lever (35) retreats into the return means accommodating recess (39) by pushing the tip of the oblique downward protrusion (41) against the equator of the fitted member (3). There is. The compression coil spring (34) is compressed and biases the lower end of the stopper return lever (35) diagonally rearward and downward,
This biasing force is received by the fitted member (3).

FIG. 9 corresponds to the stopper lock state shown in FIG. 7 of the first embodiment. As described above, the stopper (5) is in the removal allowable position and is not returned to the removal prevention position side. Blocked, hook body (32) mated member
It is ready to be taken out from (3). Compression coil spring that urges the stopper return lever (35)
Since the elastic force of (34) is a diagonally downward force, it does not hinder the upward removal of the hook body (32). In this state, the stopper pushing portion (40) of the stopper return lever (35) opposes the stopper (5) from below and contacts the stopper (5). The portion of the stopper (5) that is in contact with the stopper pushing portion (40) is located directly below the upper end of the stopper guide portion (24) of the elongated hole (23).

In FIG. 10, the hook body (32) is fitted with a member to be fitted.
It shows the state when it is removed from (3). In the first embodiment, the hook device (1) is removed in the stopper locked state shown in FIG. 7, and the state of FIG. 7 is retained even after the removal, but in the second embodiment, The hook device (31) changes as shown in.

The lower end of the stopper return lever (35) retracted into the return means accommodating recess (39) by being pushed by the equator of the fitted member (3) has the hook body (32) at its lower end. As it is removed upward, it comes in contact with the portion above the equator of the fitted member (3) and protrudes from the return means accommodating recess (39). As a result, the stopper return lever (35) moves the swing shaft (3
It swings around 6) and the stopper pushing part (40) moves upward. Therefore, an upward force is applied to the stopper (5), and this upward force causes a moment in the same direction as when the lock releasing operation section (22) is moved rearward about the connecting pin (7). As a result, the unlocking operation portion (22) moves rearward, and the hook body (32) is moved to the fitted member.
When the hook device (31) is completely removed from (3), the hook device (31) returns to the state shown by the chain line. That is, the operator does not need to return the stopper (5) to the slip-out prevention position side, and the state shown in FIG. 8 is restored. If the hook body (32) is fitted to the mated member (3) in this state, the stopper
(5) is held at the slip-out prevention position, and the state shown in FIG. 8 is obtained. In this way, it is possible to prevent an unsafe use state in which the hook body (32) is fitted to the fitted member (3) while the stopper (5) is on the slip-out allowing position side. In the above operation, the hook body (32) is attached to the fitted member (3).
Operation part for unlocking the stopper (5) when removing it from the
(22) is moved to the slip-out prevention position side, but the timing for moving the unlocking operation part (22) to the slip-out prevention position side is to set the hook body (32) to the fitted member (3). The stopper (5) once located on the removal allowance side can be prevented from coming off when the hook body (32) is fitted to the mated member (3). The return timing is not limited as long as it returns to the position side.

Although the hook devices (1) and (31) of the first and second embodiments are used in the scaffolding shown in FIG. 1 and the like, the workbench is smaller than the scaffolding and can be transported and folded. It can also be used for. FIG. 11 illustrates such a prefabricated workbench. In the following description, FIG.
The left of 1 is the front and the right is the rear. This prefabricated workbench (51) consists of a pair of front and rear legs (52) with casters (53), left and right cross members (54) connecting the upper ends of the front and rear legs (52), and front and rear legs.
Scaffolding board (55) removably mounted between the upper ends of (52)
And a handrail (56) removably attached to the scaffolding board (55)
And a brace (57) diagonally passed between the step (58) in the middle of the front and rear legs (52) and the scaffolding plate (55). Scaffolding board
The hook device (31) according to the present invention is attached to the front and rear ends of the (55), and the hook device (31) is provided on the upper end of each leg (52). ) Is fitted. Further, one end of the brace (57) is swingably supported by the scaffolding plate (55) via the brace mounting plate (60), and the hook device (31) of the present invention is attached to the other end. The hook device (31) is detachably fitted to the round pipe step (58).

According to this prefabricated workbench (51), the scaffold plate (55) or the brace can be obtained only by fitting the hook device (31) to the cross member (59) or step (58) of each leg (52). It is possible to install (57), and these do not come off after assembly, and stable work on the workbench (51) is secured. And when disassembling this prefabricated workbench (51),
(5) can be locked while it is on the allowable position side, so it can be easily disassembled by one person.

[Brief description of drawings]

FIG. 1 is a side view showing a scaffold in which a hook device according to the present invention is used.

FIG. 2 is an exploded perspective view of the hook device according to the first embodiment.

FIG. 3 is a plan view of the same.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along the line VV of FIG.

FIG. 6 is a view corresponding to FIG. 4 in a state in which the hook device is being fitted.

FIG. 7 is a view corresponding to FIG. 4 in a state where the stopper is locked.

FIG. 8 corresponds to FIG. 4 of the hook device according to the second embodiment.

9 is equivalent to FIG.

FIG. 10 is a diagram showing a state in which the hook device is being removed from the state shown in FIG.

FIG. 11 is a side view showing a workbench in which the hook device according to the present invention is used.

[Explanation of symbols]

(1) (31) Hook device (3) Fitted member (4) (32) Hook body (5) Stopper (6) Torsion coil spring (elastic member) (6a) Connection side end (6b) Free end (6c) Coil part (7) Connecting pin (9) Space for stopper placement (13) Guide groove (15) Protrusion (21) Engagement part to prevent slipping out (22) Operation unit for unlocking (23) Long hole (24) Stopper guide part (25) Stopper lock part (26) Engagement protrusion (33) Stopper return means (34) Compression coil spring (elastic member) (35) Stopper return lever (39) Stopper pushing part

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04G 1/26 E04G 5/08 E04G 7/22 E04G 7/30

Claims (5)

(57) [Claims] 1. Upper walls (12) (37) and front and rear walls (10) (11) (36)
The hook body (4) having the inverted U-shaped inner peripheral surface (4a) (4b) (4c) (32a) (32b) (32c) fitted to the fitted member (3) by (11) (32) and the hook body (4) are arranged in the stopper arrangement space (9) provided in the hook body (4) and (32).
(32) A fall prevention member that protrudes from the lower end of the rear wall (11) toward the lower end of the front wall (10) (36) to prevent the hook body (4) (32) from coming off from the fitted member (3). It has a mating part (21), and the engaging part
(21) can be moved from the slip-out prevention position to the lower end of the front wall (10) to a slip-out allowable position that allows the hook bodies (4) and (32) to slip out of the fitted member (3). Stopper (5),
Elastic member (6) for urging the stopper (5) toward the slip-out prevention position
And a connecting pin (7) that is fixed to the left and right sides of the stopper placement space (9) and that integrates the hook bodies (4) (32), the stopper (5) and the elastic member (6). In the hook device, the stopper (5) has a long hole (23) through which the middle part of the connecting pin (7) is inserted.
3) is the stopper guide part (24) that moves the stopper (5) between the removal prevention position and the removal allowance position, and the stopper guide part (24) that is continuous with the stopper (5). portion of the stopper lock mutually engaged (25) and Ri more greens, protrusions on the left and right sides of the stopper (5) (26) is provided and the connecting pin (7) when moving to the preventing position opposite even more missing From
Guide the guides (26) to the hook bodies (4) (32).
De groove (13) a hook and wherein that you have provided. 2. The elastic member (6) is a double torsion type torsion coil spring, the connecting pin (7) is inserted into the coil portion (6c), and the connecting end (6a) is a hook body.
(4) It is hooked on the engaging part (15) provided on (32), and each free side end (6b) is located on the protrusion (26) of the stopper (5) to prevent the stopper (5) from coming off. The hook device according to claim 1 , wherein the hook device is biased toward the side. 3. A stopper arranging space for the stopper (5)
(9) An unlocking operation part (22) protruding upward is provided.By moving this unlocking operation part (22) to the removal prevention position side, the stopper locking part (25) claim 1 or it is possible to move the fits crowded in that the coupling pin (7) in a stopper guiding portion (24) to
2 hook devices. 4. The operation part (22) for unlocking the stopper (5)
4. The hook device according to claim 3 , further comprising stopper returning means (33) for moving the stopper to the slip-out prevention position side. 5. The stopper returning means (33) comprises an elastic member (34).
And a stopper return lever (35) for transmitting the elastic force of the elastic member (34) to the stopper (5) and a swing shaft (36) for swinging the stopper return lever (35). 3
5) At the upper end, a stopper pushing part (39) is provided to face the stopper (5) at the slip-out allowing position with the hook body (32) fitted to the fitted member (3) from below. claim elastic force is applied to the lower end of the stopper return lever (35) 4
Hook device.