Connecting hook

Abstract

To provide a connecting hook which is highly safe and enables the entire hook to be made smaller and lighter.SOLUTION: A connecting hook comprises a hook body 11 with a hook portion 14 at its tip, a slip-prevention device 12 rotatably attached to the side of the hook body where the hook portion opens, and a safety device 13 for operating the slip-prevention device to a locked or unlocked state. A slide hole 16 is formed in the center of the hook body, and the other end of a slide pin 25 arranged in the slide hole is connected to the safety device arranged on the back side of the hook body, so that the safety device can slide relative to the hook body. One end of biasing means 26 is connected to the inside of the slip-prevention device on the side where the hook portion opens at the center of the hook body, and the other end of the biasing means is connected to one end of the slide pin, so that the safety device is biased by the biasing means via the slide pin.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a connecting hook for connecting a lanyard of a fall prevention device used when working at height to a harness or waist belt worn by a worker. [Background technology]

[0002] As this type of hook for connection to the human body, there is known a hook 1 having a structure in which an opening / closing cap 4 is attached to the abdomen of a hook body 3 having a hook portion 2 at its tip, and a safety lever 5 is pivotally attached 6 to one side of the base of the hook body 3 so as to be freely rotatable, as shown in FIG. 9 (see, for example, Patent Document 1). By rotating the safety lever 5 and fitting the latching protrusion 7 of the safety lever 5 into the fitting portion 8 of the opening / closing cap 4 to prevent the opening / closing cap 4 from rotating, the risk of the opening / closing cap 4 inadvertently opening during use and accidentally detaching the connection with the connecting member such as a D-ring, which could result in the worker falling, can be reduced.

[0003] In addition, a hook having a structure different from that of Patent Document 1 is also known, in which a safety lever biased in the locking direction by the force of a spring is placed under the opening / closing cap, and the opening / closing cap is opened and closed by sliding the safety lever sideways against the force of the spring. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Jpn. Jpn. Published No. 57-19460 Summary of the Invention [Problem to be solved by the invention]

[0005] In the structure of Patent Document 1 mentioned above, the safety lever 5 is positioned on the side of the opening / closing cap 4, so if a lanyard, component, etc. gets caught on the safety lever 5 during use, it is possible that the safety lever 5 will come loose from its engagement with the opening / closing cap 4. The safety lever 5 is pivotally attached 6 to the hook body 3, and fits into a fitting 8 on the side of the opening / closing cap 4 to prevent the opening / closing cap 4 from rotating, but since it is not biased by a spring or the like, it cannot automatically return to the locked state once it is released. In this case, the opening / closing cap 4 is constantly in a state where it can rotate, so it cannot be said that the safety performance is sufficiently ensured.

[0006] Furthermore, in hooks having a structure different from that of Patent Document 1, the safety lever is positioned on the underside of the opening / closing cap, which results in a concentration of parts around the opening / closing cap, and the need to ensure space for movement when releasing the locked state, which results in the hook becoming larger and heavier.

[0007] An object of the present invention is to provide a connecting hook which is highly safe and enables the entire hook to be made smaller and lighter. [Means for solving the problem]

[0008] The connecting hook of the present invention comprises a hook body having a hook portion at its tip, an anti-detachment device rotatably attached to the side of the hook body where the hook portion opens, and a safety device for operating the anti-detachment device to a locked or unlocked state, wherein a slide hole is formed in the center of the hook body, and the other end of a slide pin arranged in the slide hole is connected to the safety device arranged on the back side of the hook body, thereby configuring the safety device to be slidable relative to the hook body, and one end of a biasing means is connected to the inside of the anti-detachment device on the side where the hook portion opens in the center of the hook body, and the other end of the biasing means is connected to one end of the slide pin, so that the safety device is biased by the biasing means via the slide pin.

[0009] In the connecting hook of the present invention, it is preferable that a tip portion of the anti-slip device is formed with an avoidance groove for avoiding contact with the slide pin when the anti-slip device is rotated in the direction of the open state. In the connecting hook of the present invention, it is preferable that the anti-slip device is provided with a protruding piece on the anti-slip device side that protrudes outward beyond the width of the hook body, and the safety device is provided with a protruding piece on the safety device side that protrudes outward beyond the width of the hook body. In the connecting hook of the present invention, it is preferable that the safety device and the slide pin are formed as an integrated member. Effect of the Invention

[0010] In the connecting hook according to the present invention, the safety device is disposed on the back side of the hook body. In this structure, compared to a structure in which the safety device is disposed on the side, the safety device does not get caught on a lanyard or other member, and there is no problem in that the safety device comes off and the fall-prevention device can be freely operated. Therefore, a hook with high safety can be provided. In addition, compared to a structure in which the fall-prevention device is disposed on the underside, there is no concentration of parts around the fall-prevention device, and movable space can be secured when releasing the locked state, so that the hook as a whole can be made smaller and lighter. Furthermore, a structure is adopted in which a biasing force is applied to this safety device, and the biasing force of the biasing means arranged on the hook body hook side is transmitted to the safety device on the back side of the hook body via the slide pin. In this way, since the biasing means is arranged inside the fall prevention device, there is no need to provide a separate member to protect the biasing means, and it is possible to achieve size and weight reduction. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a plan view of the connecting hook of the present embodiment. [Diagram 2] FIG. 2 is a front view of FIG. [Diagram 3] FIG. 2 is a bottom view of FIG. [Figure 4] FIG. 13 is a diagram showing the state in which the anti-detachment device and the torsion coil spring have been removed. [Diagram 5] 1A is a plan view of the anti-detachment device, and FIG. [Figure 6] 13 is a diagram showing the safety device being slid to change the anti-detachment device to an unlocked state. FIG. [Figure 7] FIG. 7 is a front view of FIG. [Figure 8] 13 is a diagram showing the fall-prevention device rotated in the direction of the open state. FIG. [Figure 9] FIG. 1 is a diagram showing a conventional hook. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the connecting hook of this embodiment, FIG. 2 is a front view thereof, and FIG. 3 is a bottom view thereof. As shown in FIGS. 1 to 3, a connecting hook 10 of this embodiment includes a hook body 11, a disengagement prevention device 12, and a safety device 13.

[0013] Hook body 11 is provided with a hook portion 14 at its tip end and a connecting ring 15 at its base end. Hook body 11 is formed by bending one end of a rectangular plate, and connecting ring 15 is formed by drilling a round hole at the other end. A slide hole 16 is provided in the center of hook body 11, extending in the length direction of the hook body.

[0014] FIG. 4 is a diagram showing a state where the stopper device and the torsion coil spring have been removed. As shown in Fig. 4, a mounting base 17 is provided at a position between the connecting ring 15 and the slide hole 16 in the center of the hook body 11. The mounting base 17 is formed in a roughly U-shape, with the central surface being the surface that is installed on the hook body 11 and both side surfaces being surfaces for attaching the fall-prevention device 12. A spring connection part 18 is provided on the central surface. Although not shown, a shaft hole is provided on each of the both side surfaces.

[0015] The fall-off prevention device 12 is a member that opens and closes the opening of the hook portion 14 of the hook body 11. FIG. 5(A) is a plan view of the stopper device, and FIG. 5(B) is a front view thereof. As shown in FIGS. 5(A) and 5(B), the stopper device 12 is formed in a substantially U-shape, and has shaft holes 19 on both sides thereof. An avoidance groove 20 is formed at the tip of the central surface of the fall-prevention device 12. This avoidance groove 20 is provided for the purpose of avoiding contact with one end of a slide pin, which will be described later, when the fall-prevention device 12 is rotated in the direction of the open state. Since the avoidance groove 20 avoids contact with the slide pin, the fall-prevention device 12 can be rotated to a deep position where the tip of the fall-prevention device 12 contacts the hook body 11, and an opening with a sufficient gap is obtained. The width of the avoidance groove 20 is set to be larger than the diameter of the slide pin. In this embodiment, the avoidance groove 20 is formed in a concave shape, but it may be formed in an arc shape that matches the shape of the slide pin. As a method for avoiding contact between the slip-off prevention device 12 and the slide pin, it is possible to secure the opening diameter by setting the tip position of the hook part of the hook body high, or to make the slip-off prevention device larger. However, if the height position of the tip of the hook part is high, there is a high possibility that a structure or a lanyard will get caught on the connecting hook, which is not good from the viewpoint of safety. In addition, there is a problem that the hook shape becomes large and the weight increases. Since it is desirable to keep the height to the same level as the connecting hook of the conventional structure, it is effective to form an avoidance groove 20 that can be accommodated without changing the shape of the hook body or the slip-off prevention device. The anti-slip device 12 is provided on both side surfaces with anti-slip device side protruding pieces 21 which protrude outward beyond the width of the hook body 11.

[0016] The fall-prevention device 12 is attached to the side where the hook portion 14 in the center of the hook body 11 is open. Specifically, the shaft holes 19 on both sides of the fall-prevention device 12 are aligned with the shaft holes on both sides of the mounting base 17 so that they communicate with each other, and the shaft 22 is passed through it and both ends are swaged. In this way, the fall-prevention device 12 is attached so as to be freely rotatable. A spring 23 is passed through the shaft 22 and is attached so as to bias the stopper device 12 in the direction in which the hook portion 14 closes. As the spring 23, it is preferable to use a torsion coil spring.

[0017] The safety device 13 is a member that operates the anti-detachment device 12 to a locked state or an unlocked state. The safety device 13 is configured of a rectangular plate-like body, and both ends in the longitudinal direction of the safety device 13 are provided with safety device-side protruding pieces 24 that protrude outward beyond the width of the hook body 11. Although not shown, a fixing hole for connecting with a slide pin is provided in the center of the safety device 13. The safety device 13 is disposed on the back side of the hook body 11. The safety device 13 is disposed so that its longitudinal direction is oriented along the width direction of the hook body 11. A slide pin 25 having a head diameter larger than the width of the slide hole 16 is disposed in the slide hole 16, and the other end of the slide pin 25 is passed through a fixing hole of the safety device 13 and is connected to the safety device 13 by crimping. This allows the safety device 13 to slide relative to the hook body 11.

[0018] The locked state is a state in which the safety device 13 is disposed in the position shown in Fig. 3. In the locked state, the slide pin 25 slides toward the connecting ring 15 inside the slide hole 16. The safety device 13 connected to the slide pin 25 is also disposed on the connecting ring 15 side. In this locked state, the safety device side protrusion piece 24 and the anti-detachment device side protrusion piece 21 are disposed in positions facing each other. In this arrangement, even if an attempt is made to push the anti-detachment device 12 in the direction to rotate it, the movement is hindered by the safety device side protrusion piece 24. The unlocked state is a state in which the safety device 13 is disposed in the position shown in Fig. 6. In the unlocked state, the slide pin 25 slides toward the hook portion 14 inside the slide hole 16. The safety device 13 connected to the slide pin 25 is also disposed on the hook portion 14 side. In this unlocked state, the safety device side protrusion piece 24 is disposed in a position away from the opposing position with the anti-detachment device side protrusion piece 21. In this position, the safety device side protrusion piece 24 is in a position that does not hinder the rotation of the anti-detachment device 12, so the anti-detachment device 12 is able to rotate.

[0019] The safety device 13 is biased by a biasing means 26 via a slide pin 25. It is preferable to use a tension spring as the biasing means 26. The tension spring 26 is attached so as to bias the safety device 13 in the direction of the locked state. The tension spring 26 is connected so as to be disposed inside the fall-off prevention device 12. Specifically, as shown in Fig. 4, one end of the tension spring 26 is connected to the spring connection part 18 of the mounting base 17, and the other end of the tension spring 26 is connected to one end of the slide pin 25. With this connection, the biasing force of the tension spring 26 disposed on the side where the central hook part of the hook body 11 opens is transmitted via the slide pin 25 to the safety device 13 disposed on the back side of the hook body 11.

[0020] To use the connecting hook 10 of this embodiment, first, as shown in Figures 3 and 6, the safety device 13 located on the back of the hook body 11 is slid toward the hook portion 14 against the biasing force of the tension spring 26. This sliding of the safety device 13 moves the position of the safety device side protrusion piece 24, and the anti-detachment device side protrusion piece 21 and the safety device side protrusion piece 24 are displaced from their opposing positions. This changes the state of the anti-detachment device 12 from a locked state in which rotation is hindered to an unlocked state in which rotation is not hindered. 7 and 8, the fall-prevention device 12 is pushed and rotated toward the hook body 11 against the biasing force of the torsion coil spring 23. This rotation of the fall-prevention device 12 opens the opening. In this state, a connecting member such as a D-ring is hooked onto and detached from the hook portion 14. Note that since the tip of the fall-prevention device 12 is formed with the avoidance groove 20, the fall-prevention device 12 does not come into contact with the slide pin 25 even when rotated, and an opening with sufficient clearance can be obtained.

[0021] Thereafter, when pressure on the fall prevention device 12 is released, the biasing force of the torsion coil spring 23 causes the fall prevention device 12 to rotate in a direction returning to its original position, i.e., toward the hook portion 14, and the opening is closed. When the safety device 13 is subsequently released, the biasing force of the tension spring 26 causes the safety device 13 to slide in a direction returning to its original position, i.e., toward the connecting ring 15. This sliding of the safety device 13 causes the position of the safety device side protrusion 24 to move, and the fall prevention device side protrusion 21 and the safety device side protrusion 24 are positioned opposite each other. This causes the fall prevention device 12 to change state from an unlocked state in which rotation is not hindered to a locked state in which rotation is hindered.

[0022] <Effects of this embodiment> According to this embodiment, the following effects can be obtained. In the connecting hook 10 of this embodiment, the safety device 13 is disposed on the back side of the hook body 11. Therefore, compared to a conventional structure in which the safety device is disposed on the side, the safety device will not get caught on a lanyard or other member, and there is no risk of the safety device coming off and the anti-detachment device being freely operable. Therefore, a hook with high safety can be provided. Furthermore, compared to a conventional structure in which the safety device is located below the anti-detachment device, there is no concentration of parts around the anti-detachment device, and moving space can be secured when releasing the locked state, making it possible to reduce the size and weight of the entire hook.

[0023] In the connecting hook 10 of this embodiment, a biasing force is applied to the safety device 13 by using the tension spring 26. Therefore, even if an unintended load is applied to the safety device 13 and the state changes from the locked state to the unlocked state, the biasing force of the tension spring 26 automatically returns the safety device 13 to the original locked state, so that the connecting hook 10 can be used more safely. It is possible to provide a spring that biases the hook of the conventional structure in the direction of returning to the locked state. However, in this case, it would be necessary to attach a separate member to protect the spring, such as to cover the installed spring, which would result in problems such as the hook becoming larger and heavier. On the other hand, hook 10 of this embodiment employs a structure in which the biasing force of tension spring 26 arranged inside anti-detachment device 12 on the side where hook portion 14 at the center of hook body 11 is open is transmitted to safety device 13 on the back side of hook body 11 via slide pin 25. By arranging tension spring 26 inside anti-detachment device 12 in this manner, anti-detachment device 12 also serves as a protective member for tension spring 26, eliminating the need to provide a separate member for protecting tension spring 26, and allowing for size and weight reduction.

[0024] <Modification> The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of the present invention that can achieve the object of the present invention are included in the present invention. In the above embodiment, the anti-removal device 12 is provided with the anti-removal device side protrusion 21 and the safety device 13 is provided with the safety device side protrusion 24 to operate the opening and closing of the anti-removal device 12, but the present invention is not limited to this. For example, instead of the anti-removal device side protrusion 21, a cut may be provided on the side of the anti-removal device, and the safety device side protrusion may be fitted into this cut in the locked state and removed from the cut in the unlocked state to operate the anti-removal device. In the above embodiment, the safety device 13 and the slide pin 25 are used as separate members, and the other end of the slide pin 25 is passed through the fixing hole of the safety device 13 and then tightened to connect the slide pin 25 and the safety device 13, but this is not limiting. The safety device and the slide pin may be formed as an integrated member.

[0025] In the above embodiment, the connecting ring 15 is provided on the base end side of the hook body 11, but the present invention is not limited to this. For example, instead of the connecting ring 15, the base end side may be bent at a right angle to the same side as the hook portion 14 to provide a ring body attachment part, and an attachment hole may be drilled in this ring body attachment part. In the above embodiment, the slide pin 25 has a head diameter larger than the width of the slide hole 16, but is not limited to this. For example, a parallel pin may be used and placed in the slide hole 16, and one end of the parallel pin may be crimped so as not to come out of the slide hole 16. [Industrial Applicability]

[0026] The connecting hook described above can also be used as a hook for connecting to an extension adjuster used in a work positioning device. [Explanation of symbols]

[0027] 10 Connecting Hooks 11 Hook body 12 Anti-fall device 13 Safety equipment 14 Hook section 16 Slide hole 25 Slide pin 26 Urging means (tension spring)

Claims

1. A hook body having a hook portion provided at a tip side; a hook stopper device rotatably attached to the hook body on the side where the hook portion is open; a safety device for operating the anti-detachment device into a locked state or an unlocked state; Equipped with A slide hole is formed in the center of the hook body, The other end of the slide pin arranged in the slide hole is connected to the safety device arranged on the back side of the hook body, so that the safety device is configured to be slidable relative to the hook body, One end of a biasing means is connected to the inside of the fall-off prevention device on the side where the hook portion at the center of the hook body is open, and the other end of the biasing means is connected to one end of the slide pin, so that the safety device is biased by the biasing means via the slide pin. A connecting hook characterized by:

2. An avoidance groove is formed at the tip of the anti-detachment device to avoid contact with the slide pin when the anti-detachment device is rotated in the direction of the open state. The interlocking hook of claim 1 .

3. The fall prevention device is provided with a fall prevention device side protruding piece that protrudes outward beyond the width of the hook body, The safety device is provided with a safety device side protruding piece that protrudes outward beyond the width of the hook body.

3. The connecting hook according to claim 1 or 2.

4. The safety device and the slide pin are formed as an integrated member.

3. The connecting hook according to claim 1 or 2.

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