JP5877140B2 - Safety hook - Google Patents

Description

  The present invention relates to a hook having a rotating closing body, and more particularly to a safety hook that can lock the closing body in a closed state.

  The hook-shaped hook is easy to attach and detach, and has excellent load resistance, so that tools and devices are connected and held in tension with each other like a connecting part of a crane or high-rise work safety device Widely used in applications.

  Also, since it is often used in places where high weight is applied as described above, the entrance of the hook is closed in the locked state in order to prevent inadvertent detachment of the connecting portion and improve safety. Many occluding members are also considered.

  FIG. 9 shows a conventional safety hook 100. The safety hook 100 includes a main body 101 having a hook-shaped hook 101a and a connecting portion 101b, and an opening / closing member 102 for opening and closing the hook 101a. A two-dot chain line in the figure indicates a state when the opening / closing member 102 is opened.

  As can be seen from FIG. 9, the opening / closing member 102 is formed with a bent elongated hole 102a having a bent shape. In addition, when the opening / closing member 102 is in the closed state, a bent long hole 102 a having a shape matching the bent long hole 102 a is also formed in the main body 101. And the lock member 103 is arrange | positioned so that these two bending long holes 102a may be penetrated.

  With such a shape, when the lock member 103 is disposed at the position A, the opening / closing member 102 is locked and cannot be opened. Further, when the lock member 103 is disposed at the position B, the opening / closing member 102 is unlocked and can be opened. By simply sliding the lock member 103 in the bending long hole 102a, a locked state can be easily formed, and it is possible to prevent the connection from being inadvertently pushed open and released.

  Such a configuration is disclosed in Patent Document 1.

Japanese Patent Laid-Open No. 10-205586

  However, many hooks made of high-strength forging are generally used for high-load hooks. And since it is not easy to perform a complicated process on a forged product, an increase in manufacturing cost is inevitable if a complicated shape for realizing a locking mechanism is to be formed.

  Therefore, in order to solve the above problems, the safety hook of the present invention has a highly versatile configuration that can surely prevent the release of the connection against an inadvertent external force without impairing the easy attachment / detachment characteristics. It aims to provide at low cost.

In order to achieve the above object, the safety hook of the present invention has a hook-shaped hook portion, one end of which is pivotally supported by a support shaft to the base portion of the hook portion, and the other end is abutted against the tip of the hook portion from the inside. A closing hook that contacts and closes the inlet, and is arranged to face the closing body so as to sandwich the base from the direction in which the support shaft extends, and is rotated inward and overlapped by the base An oblong hole that is blocked from a midway position in the vicinity of the support shaft, two side plates formed respectively, a connecting portion that connects the two side plates on the outside in the rotational direction, and a direction substantially parallel to the support shaft A sliding pin that is slidably disposed in the elongated hole so as to penetrate the two side plates, and is further wound around the support shaft to respectively connect the inner surface of the connecting portion and the inner surface of the base portion. , As a spring receiving surface, the closing body is urged in the closing direction, and between the contact end contacting the base and the support shaft Characterized by comprising a coil spring which is bent to protrude toward the long hole side so as to separate the inwardly relative to the base.

  As described above, according to the present invention, when the closing body rotates inward, the long hole formed in the side plate is closed from the midway position by the overlapping base portion. Accordingly, when the sliding pin is arranged and rotated from the midway position to the support shaft side, the elongated hole is narrowed at the midway position, and the region is divided so that the slide pin is confined on the support shaft side. That is, the sliding pin is engaged between the outer edge of the elongated hole and the base portion, and the closed body is locked.

  On the other hand, when the sliding pin is disposed on the free end side of the closing body from the midway position and the closing body is rotated inward, the sliding pin is pushed by the inner surface of the base and is sent to the free end side. In other words, the unlocked state allows the opening of the closing body.

  With such a simple configuration, the sliding pin can be placed between the locked state and unlocked state only by selecting either the support shaft side or the free end side with respect to the middle position of the long hole. Can be switched.

  In addition, a portion of the spring receiving surface of the coil spring between the contact portion that contacts the inner surface of the base portion and the support shaft is bent so as to protrude toward the elongated hole. Accordingly, when the sliding pin moves between the free end side and the support shaft side and passes through the bent portion of the coil spring protruding into the elongated hole, it is necessary to once extend and retract the bent portion of the coil spring. . After the passage of the sliding pin, a click sound is generated when the coil spring returns, so that a feeling of moderation is produced in the sliding operation and the operability is improved. Furthermore, since the sliding pin arranged on the support shaft side can be prevented from falling off to the free end side, the locked state can be maintained satisfactorily.

1 is an overall perspective view of a safety hook according to a first embodiment of the present invention. It is a perspective view of the coil spring of the safety hook of FIG. It is a side view of the closure body periphery of the safety hook of FIG. 1, (a) is a release state of the closure body, (b) is an enlarged view showing a locked state of the closure body. FIGS. 2A and 2B are side views of the vicinity of the closure body of the safety hook of FIG. 1, in which FIG. 1A shows a state in which the sliding pin is located on the free end side, and FIG. (C) is the enlarged view which showed the state in which the sliding pin is located in the spindle side. It is the figure which showed typically the positional relationship of the base part of the safety hook of FIG. 1, the contact end of a coil spring, and a sliding pin. It is a perspective view of the coil spring of the safety hook which concerns on the 2nd Embodiment of this invention. It is a perspective view of the coil spring of the safety hook which concerns on the 3rd Embodiment of this invention. It is a safety hook which concerns on the 4th Embodiment of this invention, Comprising: (a) is a perspective view of the whole, (b) has shown the side view. It is the figure which showed the safety hook with the conventional lock mechanism.

  Hereinafter, safety hooks according to embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows an overall perspective view of a safety hook 1 according to the present embodiment. The safety hook 1 is mainly composed of a hook-shaped hook portion 2 and a closing body 4. One end 4a of the closing body 4 is pivotally supported on the base 2a side of the hook portion 2 by a support shaft 8 so as to be swingable.

  The closing body 4 is disposed so that the side plates 4c face each other so as to sandwich a part of the base portion 2a from the direction in which the support shaft 8 extends, and these two side plates 4c are connected to each other by the connecting portion 4d on the outer side in the rotation direction. Yes. Each of the two side plates 4c is formed with a curved long hole 5 so as to protrude inward in the rotational direction. The vicinity of the support shaft 8 of the elongated hole 5 is bent outward in the rotation direction.

  A slide pin 6 is slidably disposed in the elongated hole 5 formed in each of the two side plates 4 c so as to extend substantially parallel to the support shaft 8. At both ends of the sliding pin 6, heads 6a are formed so as to prevent dropping from the long hole 5 and to facilitate operation.

  A coil spring 10 is wound around the support shaft 8. The coil spring 10 wound around the support shaft 8 on the front and back of the base portion 2a is installed with the inner surface of the connecting portion 4d and the inner surface of the base portion 2a as spring receiving surfaces, and the closing body 4 is the tip of the hook portion 2. 2b is urged in the direction of abutting on the inside, that is, the direction of closing the inlet 2c.

  At the free end (the other end) 4b of the closing body 4, a notch 4e is formed along the surface shape of the tip 2b of the hook portion 2. Thereby, even if a force in the twisting direction is applied to the closed body 4 in the closed state, the free end 4b can be stably held in the closed position without coming off from the tip 2b of the hook portion 2.

  Next, the shape of the coil spring 10 will be described with reference to FIG.

  FIG. 2 is a perspective view of the coil spring 10 before assembly. As can be seen from FIG. 2, the coil spring 10 is formed by bending one wire. In FIG. 1, the portion that contacts the inner surface (spring receiving surface) of the connecting portion 4 d extends linearly upward in FIG. 2. On the other hand, a bending process is performed between the abutting end 10a that abuts on the inner surface (spring receiving surface) of the base portion 2a and the coil portion 10b wound around the support shaft 8 to form a chevron portion 10c. ing. Thereby, as shown in FIG. 1, the mountain-shaped portion 10 c is spaced inward from the base portion 2 a. Before describing the positional relationship between the mountain-shaped portion 10c of the coil spring 10 and the elongated hole 5, the relationship between the elongated hole 5 and the base portion 2a will be described with reference to FIG.

  FIG. 3 is an enlarged side view of the periphery of the closing body 4. For convenience of explanation, the front side plate 4c, the sliding pin 6, and the support shaft 8 are shown in a partially broken state. Here, FIG. 3A shows a state in which the closure body 4 is unlocked, and FIG. 3B shows a state in which the closure body 4 is locked.

  As can be seen from FIG. 3B, the elongated hole 5 formed in the closing body 4 in the present embodiment is formed with a bent portion 5a in the vicinity of the support shaft 8 when the closing body 4 rotates inward. It is blocked by the base 2a from the area where it is located toward both ends. Hereinafter, when the closing body 4 rotates inward, the middle position of the long hole 5 that is first closed by the base 2a due to overlapping with the base 2a (in side view) is referred to as an intersection start position P.

On the side of the support shaft 8 from the intersection start position P, a space is formed so that the sliding pin 6 can be accommodated. For this reason, when the closing body 4 tries to rotate inward with the sliding pin 6 disposed in the space on the support shaft 8 side, the sliding pin 6 is in a state of being bitten in the space on the support shaft 8 side. It is confined and the closing body 4 is locked. This is because the intersection start position P is closer to the free end 4 b than the sliding pin 6.

  On the contrary, if the sliding pin 6 is arranged on the free end 4b side with respect to the intersection start position P, when the closing body 4 is rotated inward, a pressing force is applied from the base portion 2a that closes the long hole 5 to slide. The moving pin 6 is sent to the free end 4b side.

  In the present embodiment, since the intersection start position P is formed so as to substantially overlap the bent portion 5a, the position of either the support shaft 8 side or the free end 4b side is selected with the bent portion 5a as a boundary. Thus, the locking state and the releasing state of the closing body 4 can be easily switched simply by disposing the sliding pin 6.

  As described above, by processing only the closing body 4, a lock mechanism using the shape of the base portion 2 a can be configured. Therefore, it is not necessary to perform complicated processing on the hook portion 2 that is a forged product. Therefore, it is possible to reduce manufacturing costs while improving safety.

  Next, the positional relationship between the long hole 5 and the coil spring 10 will be described with reference to FIG.

  FIG. 4 shows the closing body 4 in the closing position. However, the tip 2b of the hook portion 2 is not shown for convenience of explanation. 4 is a partially cutaway view excluding a part of the side plate 4c on the near side, the sliding pin 6, and the support shaft 8, like FIG. 3, so that the relationship between the coil spring 10 and the elongated hole 5 can be understood. It is shown in FIG. 4A shows the unlocked state, in which the sliding pin 6 is moving toward the bent portion 5 a in the vicinity of the support shaft 8. When the sliding pin 6 advances toward the support shaft 8 as it is, it strikes against the mountain-shaped portion 10 c of the coil spring 10 protruding into the elongated hole 5. (B) shows a state in which the sliding pin 6 is positioned at the bent portion 5 a and extends the mountain-shaped portion 10 c of the coil spring 10. (C) shows a state in which the sliding pin 6 is accommodated in the space on the side of the support shaft 8 through the bent portion 5a.

  In this way, the mountain-shaped portion 10c of the coil spring 10 is formed so as to protrude at a position that substantially overlaps the intersection start position P (see FIG. 3), so that the boundary between locking and unlocking is easily understood. . That is, when the sliding pin 6 gets over the chevron portion 10c and the chevron portion 10c tries to return to the original state, a click sound is generated.

  Therefore, in addition to easy positioning of the sliding pin 6, it is possible to recognize a locking or unlocking operation with a sense of sound and hand by obtaining a modest response with a click sound. Can do. As a result, the operation can be ensured and the safety can be improved.

  Further, the fact that the sliding pin 6 accommodated in the lock position can be prevented from inadvertently dropping to the release side also contributes to the improvement of safety.

  The coil spring 10 has its own protective function in addition to the function of improving the operability of the sliding pin 6 and the function of preventing the sliding pin 6 from falling off the lock position. Next, this protection function will be described with reference to FIG.

FIG. 5 is a side view seen from the direction in which the sliding pin 6 extends, and schematically shows the positional relationship between the abutting end 10 a of the coil spring 10 abutting on the base 2 a and the sliding pin 6. In the present embodiment, the mountain-shaped portion 10c (see FIG. 4) is formed between the contact end 10a and the support shaft 8 so as to protrude inward in the rotational direction. Even when 6 is pressed against the contact end 10a by pressing from the edge of the elongated hole 5, the inclination of the angled portion 10c makes it easy for the force to deviate in a direction away from the contact end 10a. . Thereby, the state where the contact end 10a is crushed between the base 2a and the sliding pin 6 can be avoided.

  Therefore, the wear of the contact end 10a can be suppressed and the occurrence of breakage can be prevented, so that the life of the coil spring 10 can be extended.

(Second Embodiment)
Next, a safety hook according to a second embodiment of the present invention will be described with reference to FIG.

  FIG. 6 shows a perspective view of the coil spring 20 of the safety hook according to the present embodiment. Since the configuration other than the coil spring 20 is the same as that of the safety hook 1 shown in FIG. 1 in the first embodiment, the other configuration is referred to FIG. 1 and is not shown here. In addition, the dashed-dotted line in FIG. 6 represents the centerline of the wire.

  The coil spring 20 shown in FIG. 6 differs from the coil spring 10 shown in FIG. 2 in the first embodiment in the shape of the periphery of the contact end 20a that contacts the base 2a. As can be seen from FIG. 6, the shape from the coil part 20b wound around the support shaft 8 to the chevron part 20c is the same as the coil part 10b and chevron part 10c of FIG. 2 is different from the peripheral shape of the contact end 10a in FIG. 2 in that a shoulder portion 20d is formed at a portion connected to the contact end 20a.

  In this way, when the portion connecting from the chevron 20c to the contact end 20a is bent toward the base 2a that contacts the spring receiving surface, the sliding pin 6 slides in the elongated hole 5 When moving from the top of the chevron 20c to the bottom, it can move onto the inner surface of the base 2a without contacting the abutment end 20a. As a result, the contact end 20a and the sliding pin 6 can be prevented from interfering with each other, so that the contact end 20a can be protected from wear due to friction with the sliding pin 6, and the life of the coil spring 20 can be extended. It becomes possible.

(Third embodiment)
Next, a safety hook according to a third embodiment of the present invention will be described with reference to FIG.

  FIG. 7 shows a perspective view of the coil spring 30 of the safety hook according to the present embodiment. As in the case of the second embodiment, the configuration other than the coil spring 30 is referred to the safety hook 1 shown in FIG. 1 in the first embodiment, and is not shown here.

  The shape of the coil spring 30 shown in FIG. 7 from the coil portion 30b wound around the support shaft 8 to the top of the mountain-shaped portion 30c is substantially the same as that of the coil spring 10 in FIG. Are different in that they are formed.

  The relationship between the interval W1 between the coil portions 30b, the interval W2 between the apexes of the chevron portion 30c, and the width W3 of the contact end 30a is W1> W2> W3.

  As shown in FIG. 1 in the first embodiment, the interval W1 between the coil portions 30b is substantially the same as the thickness of the base portion 2a of the hook portion 2. Therefore, when the coil spring 30 is formed as in the present embodiment, the contact end 30a is within the thickness range of the base portion 2a.

With this configuration, when the sliding pin 6 moves along the inclination of the mountain-shaped portion 30c and gets over the contact end 30a, the slide pin 6 interferes and damages the contact end 30a. Even if it should break, the skirt portion of the mountain-shaped portion 30c is within the thickness range of the base portion 2a. For this reason, it is possible to operate normally and safely without losing the spring function.

  In the present embodiment, an example is shown in which the interval is gradually narrowed from the coil portion 30b to the contact end 30a, but the thickness is within the range of the base portion 2a. A similar effect can be obtained if the contact end 30a can be accommodated. For example, if twisting is performed between the coil portion 30b and the contact end 30a and the wire rods are crossed so that the positions of the base portion 2a are interchanged, even if the contact end 30a breaks by any chance , Both can be prevented from separating in the direction in which the support shaft 8 extends. That is, since it acts so as to be pulled back within the thickness range of the base portion 2a, the respective chevron portions 30c after the breakage will be disengaged to the side surface beyond the thickness range of the base portion 2a which is the spring receiving surface. Can be prevented.

(Fourth embodiment)
Next, a safety hook 41 according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8A shows an overall perspective view of the safety hook 41, and FIG. 8B shows a side view. In the first embodiment, the same members and the same components as those of the safety hook 1 shown in FIG.

  As shown in FIG. 8, the hook portion 2 is the same as the safety hook 1 of FIG. However, in the safety hook 41 in the present embodiment, the shape of the closing body 44 is different from that of the closing body 4 in FIG.

  Specifically, the side plate 44c of the other end 44b of the closing body 44 that comes into contact with the hook portion 2 in the closed state is extended toward the inside in the rotational direction to form a handle portion 44e. The tips of the opposing handle portions 44e extend to the outside of the hook portion 2 in the closed state, and the tips of the handle portions 44e are connected by spacers 44f.

  Since it is configured in this manner, when opening the closing body 44, the handle portion 44e can be hung with a finger and rotated, which further facilitates the operation.

  Further, the handle portion 44e is provided with a retracting portion 44g with a gentle curve on the side on the other end 44b side. For this reason, it is possible to secure a sufficient accommodation space inside the hook portion 2, and it is difficult for the closure body 44 to receive a force to rotate to the open side when the object to be accommodated contacts the retracting portion 44g.

  Since the safety hook of the present invention is formed in a light weight and small size with a simple configuration, the lockable closure can be operated with one hand. Further, since a clicking sound is generated from the biasing spring at the time of locking and unlocking, the operation can be performed reliably and safely. For this reason, it can be widely used for a connecting portion of a tow rope.

1, 41 Safety hook 2 Hook 2a Base (spring receiver)
2b Tip 2c Inlet 4, 44 Closure 4a, 44a One end 4b, 44b Free end (other end)
4c, 44c Side plate 4d Connecting part (spring receiver)
44e Handle portion 5, 45 Long hole 5a Bending portion 6, 46 Sliding pin 6a Head portion 8, 48 Support shaft 10 Coil spring 10a Abutting end P Crossing start position (intermediate position)

Claims (1)

A hook-like hook portion, and a closing body that is pivotally supported by a support shaft at one end to a base portion of the hook portion and whose other end abuts against the tip of the hook portion from the inside to close the inlet. Safety hooks,
In the closure,
Slots are formed so as to be opposed to each other so that the base is sandwiched from the direction in which the support shaft extends, and are closed from the middle position in the vicinity of the support shaft by the base portions that rotate inward and overlap each other. Two side plates,
A connecting portion connecting the two side plates on the outside in the rotation direction;
A sliding pin slidably disposed in the elongated hole so as to penetrate the two side plates in a direction substantially parallel to the support shaft,
Further, the contact member is wound around the support shaft and urges the closing body in the closing direction with the inner surface of the connecting portion and the inner surface of the base portion as spring receiving surfaces, respectively, and contacts the base portion. A safety hook, comprising: a coil spring that is bent so as to be spaced apart inward from the base portion between the end and the support shaft and protrudes toward the elongated hole.