JP4147339B2 - Hook device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hook device, and more particularly to a hook device used when assembling a hypothetical scaffold, an assembly work table, or the like at a construction site.
[0002]
[Prior art]
Conventionally, as such a hook device, there are a hook body, a lock member that can be moved to a removal prevention position and a removal permission position, an elastic member that urges the lock member toward the removal prevention position, a hook body, and a lock member. And a connecting pin that integrates the elastic member, and a retaining ring that prevents the connecting pin from coming off the hook body. It is known that it moves to a position, returns to a slip-off prevention position again, and is automatically locked. In order to automatically lock, the hook body and the lock member have been cast products having a predetermined shape.
[0003]
[Problems to be solved by the invention]
Although it is well known that the number of parts is reduced and the casting is made of an extruded profile, it is easy to assemble and manufacture and the cost is reduced. However, this is not possible with the conventional hook device. Met.
[0004]
An object of the present invention is to provide a hook device capable of reducing the number of parts and easily manufacturing each part.
[0005]
[Means for Solving the Problems and Effects of the Invention]
The hook device according to the present invention covers a hook body having a prism-like base portion and a hook portion connected to a fitting member from above, and a portion extending from the upper wall of the hook portion to the front wall. A lock member that can be moved to a removal prevention position that prevents the hook body from coming off from the fitted member and a removal allowance position that allows this, and an elastic member that biases the lock member toward the removal prevention position, A lock member insertion recess extending left and right is provided in the upper part of the front end surface of the base of the hook main body, and the base of the hook main body is in the rectangular tube with the rear end of the lock member and the elastic member fitting in the recess. It is designed to be fitted in.
[0006]
According to the hook device of the present invention, the movement of the lock member in the left-right direction with respect to the hook body is restricted by fitting the base portion of the hook body into the rectangular tube body, thereby connecting the hook body and the lock member with a connecting pin or the like. The function as a hook is ensured without coupling. Thus, the hook device having a required function is constituted by only three parts.
[0007]
The hook body and the lock member are formed of an extruded shape that extends in the left-right direction. A locking prevention engagement portion is provided at the front end of the lock member, and the center in the left-right direction is formed on the lower surface of the rear end of the lock member. It is preferable that a rotation shaft portion having a circular arc shape having a shaft is provided, and a rotation shaft portion insertion groove into which the rotation shaft portion is rotatably inserted is provided in the lock member insertion recess. . If it does in this way, the structure of a hook main part and a locking member will become simple, and those manufacture will become easy.
[0008]
A stopper portion is provided at the upper edge portion of the lock member insertion recess opening for both positioning when the lock member is moved to the position where the lock member is allowed to be removed and positioning when the hook body and the square tube body are fitted together. It is preferable. In this way, the lock member can be stopped at a predetermined position, and the hook device can be easily fitted into the rectangular tube.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In this specification, “front” refers to the left in FIG. 3, “rear” refers to the right in FIG. 3, and up, down, clockwise, and counterclockwise refer to the same figure.
[0010]
FIG. 1 shows a scaffold (1) as an example in which the hook device (11) according to the present invention is used. The scaffold (1) includes a support (2), a scaffold plate (3), and a horizontal brace (4). It consists of a slanted brace (5) and an external support (6). When assembling and disassembling the scaffold (1), the scaffold plate (3) and the brace (4) (5) The hook device (11) is used to attach and detach the fitting member (P) with one touch.
[0011]
As shown in FIGS. 2 and 3, the hook device (11) according to the present invention is connected to the lower part of the prismatic base portion (13) and the front end surface thereof and is fitted to the fitted member (P) from above ( 14), a lock member (15) that prevents the hook body (12) from coming off from the mating member (P), and the lock member (15) is biased toward the prevention position. The compression coil spring (16) is made up of three parts, and the hook body (12) has a prismatic base (13) that is fitted into the square tube (17) and fixed to form a hook function. It is made to demonstrate.
[0012]
Both the hook body (12) and the lock member (15) are formed of an aluminum extruded profile extending in the left-right direction.
[0013]
The upper surface of the upper wall (14a) of the hook portion (14) is below the upper surface of the base portion (13), and the space above the upper wall (14a) of the hook portion (14) is used as an arrangement space for the lock member (15). Has been.
[0014]
The prism base (13) of the hook body (12) is provided with a locking member insertion recess (21) provided at the top of the front end surface and a screw insertion recess (22) provided at the center of the rear end surface. It has been.
[0015]
On the lower surface of the lock member insertion recess (21), there is provided a rotary shaft portion insertion groove (23) having an arc-shaped cross section near the opening, and a spring insertion groove (24) having a square cross section at the rear of this. . The bottom (21a) of the lock member insertion recess (21) is U-shaped, and the upper surface (21b) of the recess (21) is an upwardly inclined shape and a circular arc shape with a cross section protruding upward. Has been. A stopper portion (25) having a substantially triangular cross section is provided at the upper edge portion of the opening of the lock member insertion recess (21). This stopper portion (25) is used for positioning when the locking member (15) is moved to the position where the locking member (15) is allowed to move and for positioning when the hook body (12) is fitted to the rectangular tube body (17). A lower surface (25a) having a downwardly convex arc-shaped cross section smoothly connected to the upper surface (21b) of the member insertion recess (21) and a front end of the lower surface (25a) and a rear end of the prismatic base (13) upper surface An upper surface (25b) having an upwardly convex arcuate cross section located above and a rear surface (25c) extending downward from the rear end of the upper surface (25b) and orthogonal to the upper surface of the prismatic base (13). Have. The rotation shaft portion insertion groove (23) has an arcuate inner peripheral surface with an axis A extending in the left-right direction as a center and a cross section larger than a semicircle, and a convex circle of the lock member insertion recess (21). The arcuate upper surface (21b) and the convex arcuate upper surface (25b) of the stopper portion (25) are both concentric with the inner peripheral surface of the rotation shaft portion insertion groove (23).
[0016]
A pair of upper and lower tapping screw insertion grooves (27) are provided at the bottom of the screw insertion recess (22). The base (13) of the hook body (12) is usually fitted into the rectangular tube (17) and fixed by welding (W), but if welding is difficult, it penetrates the rectangular tube (17). The hook body (12) and the rectangular tube body (17) can also be coupled by screwing the tapping screw (T) into the tapping screw insertion groove (27).
[0017]
The hook part (14) has an inverted U-shape, and the lower end of the front wall (14b) is located at substantially the same height as the lower surface of the prismatic base (13), and the lower end of the rear wall (14c) It is located below the lower surface of the columnar base (13). The inner peripheral surface (28) of the hook portion (14) has a semicircular portion (28a) and a hanging portion (28b) continuous with the lower end of the rear side of the semicircular portion. The hanging part (28b) is formed by the lower end part of the rear wall (14c). The outer peripheral surface of the upper end portion of the rear wall (14c) of the hook portion (14) is formed in an arc shape in cross section, and is smoothly connected to the inner peripheral surface of the rotating shaft portion insertion groove (23). The outer peripheral surface of the rear portion of the upper wall (14a) of the hook portion (14) is substantially flat, and the outer peripheral surface (29) from the front portion of the upper wall (14a) to the front wall (14b) is formed in an arc shape in cross section. Has been.
[0018]
The lock member (15) is substantially C-shaped and covers a portion from the upper wall (14a) to the front wall (14b) of the hook portion (14). The lock member (15) has a rear end (15a) fitted in the lock member insertion recess (21), and a lower end of the lock member (15) prevents the fitted member (P) from coming off. A preventive engagement portion (30) is provided. The distance between the lower end of the engagement portion (30) for preventing slippage and the lower end of the rear wall (14c) of the hook portion (14) is smaller than the outer diameter of the fitted member (P), and the lock member (15) The hook portion (14) does not come off from the fitted member (P) unless it is rotated clockwise. Further, the axis A is positioned substantially on the extension of the line extending in the diametrical direction of the member to be fitted (P) from the position where the engagement part (30) for preventing slippage is in contact with the member to be fitted (P). Thus, the moment around the axis A of the force received from the mating member (P) by the disconnection preventing engagement portion (30) is substantially zero.
[0019]
On the lower surface of the rear end portion (15a) of the lock member (15), a rotary shaft portion (31) having an arc-shaped cross section fitted in the rotary shaft portion insertion groove (23), and a rotary shaft portion ( And a spring receiving portion (32) provided rearward of 31) and receiving the upper end of the compression coil spring (16).
[0020]
The outer peripheral surface of the rotating shaft portion (31) has an arc-shaped cross section larger than a semicircle centering on the axis A, and the diameter is slightly larger than the diameter of the inner peripheral surface of the rotating shaft portion insertion groove (23). Has been made small. Thereby, the rotation shaft portion (31) is fitted in the rotation shaft portion insertion groove (23) so as to be rotatable about the axis A. Since the circumferential surfaces of the rotation shaft portion (31) and the rotation shaft portion insertion groove (23) are both larger than a semicircle, the rotation shaft portion (31) can be moved by sliding the rotation shaft portion insertion groove ( 23), thereby preventing the lock member (15) from coming off the hook body (12).
[0021]
The spring receiving part (32) has a shallow recess (32a) into which the upper end of the compression coil spring (16) is fitted, and the spring receiving part (32) located behind the rotating shaft part (31) ( 32) abuts on the upper end of the compression coil spring (16), so that the lock member (15) is urged by the compression coil spring (16) to rotate counterclockwise, that is, to the slip prevention position side. . The rear edge portion (32b) of the recess (32a) is movably accommodated in the U-shaped bottom portion (21a) of the lock member insertion recess (21).
[0022]
The inner peripheral surface (33) of the lock member (15) is formed so as to be substantially along the outer periphery of the hook portion (14) when in the removal prevention position shown in FIG. The prevention engaging part (30) is formed so as to be applied from below to the rear part of the lower half of the fitted member (P). Furthermore, in the same figure, the rear edge portion (32b) of the spring receiving portion (32) of the lock member (15) is in contact with the upper surface of the U-shaped bottom portion (21a) of the lock member insertion recess (21), With these configurations, the lock member (15) is stopped at the prevention position.
[0023]
On the other hand, in FIG. 3, a gap is formed between the lower surface of the rear end portion (15a) of the lock member (15) and the lower surface of the lock member insertion recess (21), and the rear side of the rotating shaft portion (31). A gap is also formed between the base portion and the rear side edge portion of the rotation shaft portion insertion groove (23). Further, the lock member (15) does not fit into the stopper portion (25) of the rectangular tube base (13) when in the removal prevention position, but is the same when rotated clockwise from the same position. An engagement recess (35) is formed that just fits into the part (25). The upper surface (35a) of the engagement recess (35) has a convex arcuate cross section centered on the axis A and on a diameter slightly larger than the convex arcuate upper surface (25b) of the stopper part (25). ing. Furthermore, a gap is formed between the engaging portion for preventing slippage (30) and the front wall (14b) of the hook portion (14) so as not to prevent the locking member (15) from rotating clockwise. Has been.
[0024]
Further, the upper surface (34) of the rear end portion (15a) of the lock member (15) is slightly smaller in diameter than the convex arcuate upper surface (21b) of the lock member insertion recess (21) with the axis A as the center. When the rotation shaft portion (31) of the lock member (15) rotates in the rotation shaft portion insertion groove (23), these smooth upper surfaces (34) (21b) ), The lock member (15) smoothly rotates in either direction with respect to the hook body (12).
[0025]
When the lock member (15) in the removal prevention position is rotated clockwise, the engagement recess (35) and the stopper portion (25) are completely fitted, and the rear end portion of the lock member (15) ( The lower surface of 15a) is brought into contact with the lower surface of the lock member insertion recess (21), and further rotation of the lock member (15) in the clockwise direction is prevented. At this time, the disengagement preventing engagement portion (30) is moved to a position where the opening of the hook portion (14) is not blocked.
[0026]
Thus, the lock member (15) urged counterclockwise by the compression coil spring (16) is stopped at the slip prevention position, and a clockwise force exceeding the elastic force of the compression coil spring (16). When the lock is applied, the lock member (15) is rotated in the clockwise direction and stopped at the allowance position.
[0027]
To move the lock member (15) in the removal prevention position to the removal allowance position, either turn the lock member (15) clockwise from both sides, or move the front end of the lock member (15) from below. Push it up clockwise. The locking member (15) is provided with through holes (36) extending left and right to facilitate sandwiching from both the left and right sides, and four slips are provided on the outer peripheral surface of the front end of the locking member (15). Stop protrusions (37) are provided at a predetermined interval to facilitate pushing up the lock member (15) in the clockwise direction.
[0028]
FIG. 4 shows a state when the hook device (11) is attached to the fitted member (P). In the same figure, when the hook body (12) is fitted onto the member to be fitted (P) from above, the engaging part (30) for preventing the lock member (15) from coming off is the member to be fitted (P). It hits a part slightly above the upper and lower centers of the upper and lower ends, and receives a forward upward force from the fitted member (P). This force generates a clockwise moment about the axis A, and the locking member (15) rotates clockwise around the axis A and the disconnection preventing engagement portion (30) reaches the allowance position. It is moved (see FIG. 4A). Therefore, the hook member (14) of the hook body (2) is fitted to the mating member (P), and thereby the mating member (the mating member (30) is rotated clockwise). Since the diagonally upward force from P) disappears, the lock member (15) returns to the slip-off prevention position by the elastic force of the compression coil spring (16) (see FIG. 4B). The state shown in FIG. 4B is the same as that in FIG. 3, and as described above, both the clockwise and counterclockwise rotations are prevented and a stable state is maintained.
[0029]
FIG. 5 shows a state when the hook device (11) is removed from the fitted member (P). In this figure, when the lock member (15) is moved in the clockwise direction, the lock member (15) is fitted into the engagement recess (35) and the stopper portion (25) completely, and the rear end portion (15a ) Is moved and stopped until the lower surface of) is brought into contact with the lower surface of the lock member insertion recess (21) (see FIG. 5A). As a result, the hook portion (14) can be removed from the fitted member (P), and if the entire hook device (11) is lifted in this state, it can be removed from the fitted member (P). (See FIG. 5B). When the hook device (11) is completely removed and the force applied to the engagement preventing portion (30) of the locking member (15) from the mating member (P) is removed, the hook device (11) is restored to the original position. It returns to the state (see FIG. 4A and FIG. 3).
[0030]
The hook device is attached to both ends of the rectangular tube body (17) used as the brace (4) (5) of the scaffold shown in FIG. 1, and for example, as shown in FIG. It is also attached to both ends of the rectangular tube (17) fixed on both sides of 3).
[Brief description of the drawings]
FIG. 1 is a side view showing a scaffold as an example in which a hook device according to the present invention is used.
FIG. 2 is an exploded perspective view showing a hook device.
FIG. 3 is a cross-sectional view of the same.
FIG. 4 is a cross-sectional view showing a state when the hook device is attached.
FIG. 5 is a cross-sectional view showing a state when the hook device is removed.
FIG. 6 is a perspective view showing a scaffold plate to which a hook device is attached.
[Explanation of symbols]
(11) Hook device
(12) Hook body
(13) prismatic base
(14) Hook part
(14a) Upper wall
(14b) Front wall
(15) Lock member
(15a) Rear end
(16) Compression coil spring (elastic member)
(17) Square tube
(21) Locking member insertion recess
(23) Rotating shaft insertion groove
(25) Stopper part
(30) Fitting prevention engagement part
(31) Rotating shaft
(P) Mated member

Claims (3)

A hook body (12) having a hooked portion (14) connected to the fitted member (P) from above, connected to the lower part of the prismatic base (13) and the front end surface thereof, and an upper wall of the hook portion (14) ( 14a) to the front wall (14b) and the lock that can be moved to the position to prevent the hook body (12) from coming off from the mating member (P) and the position to allow it to be removed The lock member (15) and the elastic member (16) that urges the lock member (15) toward the slip-off prevention position side, and extends to the left and right on the front end surface of the base (13) of the hook body (12). A fitting recess (21) is provided, and the base of the hook main body (12) in a state where the rear end (15a) of the lock member (15) and the elastic member (16) are fitted in the recess (21) ( A hook device in which 13) is adapted to be fitted into the rectangular tube (17). The hook body (12) and the lock member (15) are formed of an extruded profile extending in the left-right direction, and a locking prevention member (30) is provided at the front end of the lock member (15). (15) On the lower surface of the rear end portion (15a), a rotary shaft portion (31) having an arcuate cross section having a central axis in the left-right direction is provided, and in the lock member insertion recess (21), the rotary shaft portion The hook device according to claim 1, further comprising a rotation shaft portion insertion groove (23) into which (31) is rotatably fitted. At the upper edge of the lock member insertion recess (21) opening, when the lock member (15) is moved to the position where the lock member (15) is allowed to move and when the hook body (12) and the square tube body (17) are fitted together The hook device according to claim 1 or 2, wherein a stopper portion (25) serving also for positioning is provided.

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