JP7134433B2 - safety belt hook - Google Patents

Description

TECHNICAL FIELD The present invention relates to a hook used for locking a lifeline connected to a safety belt to a fixing structure to prevent a worker from falling at a high work site.

There are two types of safety belts worn by workers at aerial work sites, such as a harness type and a waist belt type. Locking prevents the operator from falling and ensures safety.
In order to prevent the hook from opening and coming off due to unforeseen circumstances, a hook capable of locking the stopper has been invented in the conventional hook (Patent Document 1). In general, a hook having a similar structure opens an opening by gripping an unlocking handle and a stopper together with the hook body, and locks the hook to a structure. As a result, the user's finger caught in the intermediate portion of the stopper partially blocks the opening, which sometimes interferes with locking or removing the hook from the fixing structure. Therefore, by bending the shape of the stopper, a hook for a safety belt that does not interfere with the user's fingers (Patent Document 2), and the stopper can be opened and closed without putting a hand on the stopper itself, so the hook is effective. A hook or the like that can secure a diameter is known (Patent Document 3).

JP-A-7-031687 JP 2007-117573 A JP 2017-108822 A

However, while safety belt hooks with a maximum diameter of 50 mm are installed in general lifelines to prevent falls during high-place work, railroad contact line equipment uses equal-sided angle steel 75, There are fixing structures with a size larger than the maximum diameter of hooks for general safety belts (hereinafter referred to as conventional hooks), and conventional hooks could not be directly attached in some cases.
At present, this problem is dealt with by using a large hook with a large diameter or by wrapping a conventional hook around the fixing structure. Existing large hooks that can be directly attached to fixed structures that cannot be attached to conventional hooks are much larger and heavier than conventional hooks. were negative to There is also a method of locking a large hook to a fixing structure and hanging a conventional hook on the locked large hook. On the other hand, in the case of using a conventional hook to hang, if the fixing structure has an edge such as an equilateral angle steel, the lifeline may be cut by the edge when dropped. For this reason, curing is required to hide the edges of the fixing structure, but the need to carry curing tools reduces workability, and depending on the curing method, the edges may be exposed. .

Therefore, the object of the present invention is to provide a large opening that can be directly hung on a fixing structure having a size larger than the maximum diameter of a conventional hook, and to make it as small as possible without feeling uncomfortable with conventional hooks in use. To provide a hook for a safety belt.

In order to achieve the above object, the invention according to claim 1 has a hook-shaped hook body having a locking side opening at the front, and a lower end thereof is rotatably connected to the lower part of the hook body to provide a locking side opening. A safety belt hook provided with a stopper movable between a closed position for closing the hook body from the inside and an open position for retracting to the inside to open the locking side opening, wherein the stopper is located behind the stopper Inside the hook body, there is provided an open/close lever whose lower end is rotatably connected to the lower portion of the hook body and is connected to the stopper by a link member. and a second position where the stopper is open.
According to a second aspect of the invention, in the configuration of claim 1, a lock release lever having a lower end rotatably connected to a lower portion of the hook body is provided on the rear outer side of the hook body, and the lock release lever serves as an open/close lever. The lock release lever is movable between a lock position where it is held at the first position and a release position where the open/close lever is released and allowed to move to the second position, and the lock release lever is directed toward the lock position by an elastic member. characterized by being energized by
The invention according to claim 3 is characterized in that, in the configuration according to claim 1 or 2, the hook provided at the tip of the hook body is engaged with the engagement part provided at the tip of the stopper.
According to a fourth aspect of the present invention, in any one of the first to third aspects, the stopper has a non-linear shape recessed toward the inside of the hook body.
The invention according to claim 5 is the configuration according to any one of claims 1 to 4, wherein a connection hole for connecting a lifeline is provided in the lower part of the hook body, and the stopper is located in the lower part of the hook body more than the connection hole. It is characterized by being connected to the front.

According to the first aspect of the invention, since the stopper can be operated via the link member by operating the open/close lever, there is no need to grip the stopper itself unlike the conventional hook, and the operator's fingers are not required to hold the hook. Since a part of the locking side opening is not blocked, the locking side opening can be utilized to the maximum. As a result, even if the size is smaller than the large hook of the conventional structure, the hook can be directly hung on a fixing structure with a size larger than the maximum diameter of the conventional hook, such as the equal angle steel 75, so can be made smaller. In addition, by linking the stopper and the open/close lever, the stopper can be moved to the open position inside the hook body with the same action as the conventional hook, so the conventional hook does not lose its usability. In addition, even if the opening/closing lever, the link member and the unlocking lever are damaged due to unforeseen circumstances, the stopper closes the locking side opening from the inside, so the locking side opening is not opened by the fixing structure. safety can be ensured.
According to the invention of claim 2, in addition to the effect of claim 1, the lock release lever prevents the opening/closing lever from moving from the first position at the lock position, and is attached toward the lock position by the elastic member. Since the opening/closing lever is always held at the first position and the stopper connected to the opening/closing lever by the link member can be held at the closed position, safety is improved.
According to the invention of claim 3, in addition to the effect of claim 1 or 2, the hook at the tip of the hook body is engaged with the notch at the tip of the stopper, thereby improving the breaking strength of the safety belt hook as a whole. Therefore, the safety in the event of a fall is enhanced.
According to the invention of claim 4, in addition to the effect of any one of claims 1 to 3, a large maximum usable diameter is ensured compared to the case where the stopper is linear in the hook of the same size. In addition, since the size of the entire hook can be suppressed, operability is improved.
According to the invention of claim 5, in addition to the effect of any one of claims 1 to 4, the distance from the rotation center of the stopper to the axis of the link member and the distance from the rotation center of the open/close lever to the axis of the link member is adjusted so that the moving distance of the stopper 4 can be increased with a small moving distance of the opening/closing lever, the space-saving structure can suppress the size of the hook as a whole, and the operability is improved because even a small hand can easily grasp it. improves.

It is an exploded perspective view of a hook for safety belts. (A) is a perspective view of the safety belt hook in a closed state, and (B) is a side view. (A) is a perspective view of the safety belt hook in an open state, and (B) is a side view.

An example of an embodiment of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the safety belt hook 1 includes a metal hook body 2 having a hook shape with a flat upper portion and an engaging side opening 3 at the front, and having a plate shape as a whole. A hook portion 14 is formed at the tip of the upper portion of the hook body 2, and a connection hole 9 for connecting a lifeline (not shown) is connected to the lower portion of the hook body 2, and a stopper 4 is connected to the front of the connection hole 9. mounting holes 10b and 10c to which the opening/closing lever 5 and the unlocking lever 6 are respectively connected at the rear of the connection hole 9; and insertion holes into which ends 11a and 11b of the elastic members 8a and 8b are respectively inserted. 12a and 12b are drilled, and protrusions 13a and 13b for attaching the elastic members 8a and 8b are provided.

The stopper 4 has a pair of belt-shaped stopper arms 16, 16 and a U-shaped locking portion 19 sandwiched between the stopper arms 16, 16 and formed by cutting from the front to the rear. It consists of a plate 20 and flat plate members 21a, 21a. The lower ends of the stopper arms 16, 16 are connected to the attachment holes 10a provided in the lower part of the hook body 2 from the left and right by pins 15a so that the locking side opening 3 of the hook body 2 can be opened and closed from the inside. concatenated with Also, the stopper arms 16 , 16 are formed in a dogleg shape that is concave toward the inside of the hook body 2 .
The stopper 4 configured in this manner rotates forward from the inside of the hook body 2 about the position of the connecting hole 22a, and the locking portion 19 and the hook portion 14 of the hook body 2 are engaged. and an open position in which it rotates around the position of the connecting hole 22a and retreats to the inside of the hook body 2 to open the locking side opening 3. It is possible to move between

The opening/closing lever 5 is composed of a pair of strip-shaped opening/closing arms 17, 17 and flat plate members 21b, 21b sandwiched between the opening/closing arms 17, 17. They are connected from the left and right through connecting holes 22b, 22b at the lower ends by pins 15b. Further, the opening/closing arms 17, 17 are provided with a notch portion 23 into which a locking member 24 constituting the unlocking lever 6, which will be described later, is fitted.
The open/close lever 5 configured in this way rotates forward with its upper portion centered on the position of the connecting hole 22b, and reaches a first position where the stopper 4 is closed via a link member 7, which will be described later. Similarly, the upper part rotates rearward about the position of the connecting hole 22b, and the stopper 4 can be moved between the second position and the second position where the stopper 4 is pulled to the open position via the link member 7.

The link member 7 has a linear shape with mounting holes 10d, 10d provided at both ends in the longitudinal direction. The mounting hole 10d on the rear side and the connecting holes 22d, 22d provided in the opening/closing arms 17, 17 are connected by a pin 15d.

The unlocking lever 6 has a band-like shape and is fitted into a pair of lock arms 18, 18, a flat plate member 21c sandwiched between the lock arms 18, 18, and a notch 23 provided at the bottom of the open/close lever 5. It is connected from the outside rear of the hook body 2 to the attachment hole 10c provided in the lower part of the hook body 2 from the left and right by the pin 15c through the connection holes 22c, 22c. At this time, the width of the locking member 24 in the left-right direction is equal to the width of the opening/closing lever 5 in the left-right direction.
The unlocking lever 6 configured in this way rotates forward with the lower portion thereof centering on the position of the connecting hole 22c, and the lock member 24 is engaged with the notch portion 23 of the opening/closing lever 5 at the first position. It is fitted from the rear lower side to the lock position where the opening/closing lever 5 is fixed at the first position, and similarly, the lower part rotates rearward about the position of the connecting hole 22c, and the opening/closing lever 5 is notched. The lock member 24 is retracted from the portion 23, so that the opening/closing lever 5 can be moved to and from the release position that allows the movement to the second position.

One end 11a of the elastic member 8a, which is a torsion coil spring, is inserted into the insertion hole 12a, and the other end is in contact with the flat plate member 21a of the stopper 4. As shown in FIG. The stopper 4 is thereby biased toward the closed position. One end 11b of the elastic member 8b, which is another torsion coil spring, is inserted into the insertion hole 12b, and the other end is in contact with the flat plate member 21c of the unlocking lever 6. As shown in FIG. As a result, the unlocking lever 6 is urged in the locking direction.

As shown in FIG. 2A, the safety belt hook 1 configured as described above is closed because the stopper 4 is interlocked with the opening/closing lever 5 by the link member 7 when the opening/closing lever 5 is in the first position. After taking the position, the stopper 4 is constantly urged forward by the elastic member 8a to close the locking side opening 3 from the inside. At this time, the unlocking lever 6 is biased rearward by the elastic member 8 b to assume the locked position, and the locking member 24 provided at the bottom of the unlocking lever 6 is fitted into the notch 23 of the open/close lever 5 . By engaging, the opening/closing lever 5 is fixed at the first position, and the stopper 4 interlocked with the opening/closing lever 5 is prevented from moving from the closed position to the open position. Further, when the stopper 4 takes the closed position, the hook portion 14 provided at the tip of the hook body 2 is locked to the locking portion 19 of the stopper 4, thereby improving the breaking strength of the safety belt hook 1 as a whole. do.

On the other hand, to attach or detach from a fixing structure (not shown), the opening/closing lever 5 and the unlocking lever 6 are simultaneously squeezed to move the stopper 4 to the open position as shown in FIG. 3(A). conduct.
At this time, the lower portion of the lock release lever 6 rotates rearward about the connecting hole 22 c and moves to the release position, so that the lock member 24 provided on the lock release lever 6 is moved to the notch 23 of the open/close lever 5 . , the opening/closing lever 5 is released to allow the opening/closing lever 5 to rotate. At the same time, the upper portion of the opening/closing lever 5 turns rearward about the connecting hole 22b and moves to the second position, so that the stopper 4 connected by the link member 7 is interlocked and rotates about the connecting hole 22a. By retreating to the inside of the hook body 2 and moving to the open position, the locking side opening 3 is opened.
As shown in FIG. 3(B), in the safety belt hook 1 in the open state, the stopper 4 is concaved toward the inside of the hook body 2, so that the locking side opening 3 is at the maximum available size. A large diameter L1 can be ensured. If the same size safety belt hook had a linear stopper, the rotation center of the stopper would need to be set lower in order to obtain the same maximum diameter as the non-linear stopper. This is a factor in increasing the vertical size of the entire hook. That is, by forming the stopper 4 into a doglegged shape, it is possible to suppress the size of the entire hook while ensuring the size of the maximum diameter L1. Further, by providing the attachment hole 10a for connecting the stopper 4 to the hook body 2 in front of the connection hole 9, it is possible to increase the moving distance L2 of the stopper 4 with the small moving distance L3 of the open/close lever 5. The space can be substantially saved, and the operation can be easily performed even if the operator's hand is small. In addition, since the user's fingers (not shown) gripping the opening/closing lever 5 are positioned in the gap V between the stopper 4 and the opening/closing lever 5, the user's finger is pushed by the stopper 4 when attaching to or removing from the fixing structure. It can protect your fingers.

After hooking the safety belt hook 1 with the locking side opening 3 opened to the fixing structure, the safety belt hook 1 is opened again by releasing the open/close lever 5 and the lock release lever 6. becomes the state shown in . That is, as shown in FIG. 2B, the stopper 4 is biased by the elastic member 8a to move to the closed position, and the open/close lever 5 connected by the link member 7 interlocks with the stopper 4 to move to the first position. Move to position. At the same time, the unlocking lever 6 is urged by the elastic member 8b to move to the locked position, and the locking member 24 is fitted into the notch 23 of the opening/closing lever 5, thereby fixing the opening/closing lever 5 at the first position. A stopper 4 interlocked with an opening/closing lever 5 is prevented from moving from a closed position to an open position.

The safety belt hook 1 of the above configuration has a hook-like shape having an engagement side opening 3 at the front, and a plate-shaped hook body 2 as a whole, and a connecting hole provided at the bottom of the hook body 2 for connecting a lifeline or the like. The inside of the hook body 2 is connected to a mounting hole 10a provided in front of the hook 9 so as to be movable between a closed position for closing the locking side opening 3 from the inside and an open position for opening the locking side opening 3. A V-shaped stopper 4 that is recessed facing upward and a mounting hole 10b provided behind the connection hole 9 and below the hook body 2 are provided with a first position where the stopper 4 is closed and an open position. The opening/closing lever 5 is movably connected at the second position, and a mounting hole 10c provided in the lower portion of the hook body 2 is provided with a lock position for fixing the opening/closing lever 5 at the first position and movement of the opening/closing lever 5. It is composed of a lock release lever 6 connected from the rear outside of the hook body 2 so as to be movable between the allowable release position, and the stopper 4 and the open/close lever 5 are connected through a link member 7 so as to be interlockable. .
According to the safety belt hook 1 configured in this manner, the stopper 4 can be operated via the link member 7 by operating the opening/closing lever 5, so that unlike the conventional hook, it is not necessary to grip the stopper 4 itself. Since the operator's fingers do not block a part of the locking side opening 3 of the hook, the maximum available diameter L1 can be increased. As a result, even if the size is smaller than the large hook of the conventional structure, the hook can be directly hung on a fixing structure with a size larger than the maximum diameter of the conventional hook, such as the equal angle steel 75, so can be made smaller. Further, by linking the stopper 4 and the opening/closing lever 5, the stopper 4 can be moved to the open position inside the hook body 2 by the same action as that of the conventional hook, so that the conventional hook does not lose its usability. Further, even if the opening/closing lever 5, the link member 7 and the unlocking lever 6 are damaged due to unforeseen circumstances, the stopper 4 closes the locking side opening 3 from the inside, so that the locking side opening 3 is opened by the fixing structure. safety can be ensured.

Further, the lock release lever 6 prevents the opening/closing lever 5 from moving from the first position at the locked position, and is urged toward the locked position by the elastic member 8b. Since the stopper 4 can be held at the closed position and connected to the opening/closing lever 5 by the link member 7, the safety is improved.
Furthermore, since the hook portion 14 at the tip of the hook body 2 is locked to the locking portion 19 at the tip of the stopper 4, the breaking strength of the safety belt hook 1 as a whole is improved, thereby increasing the safety when dropped. In addition, by forming the stopper 4 into a dogleg shape, compared with the case where the stopper is formed in a linear shape, it is possible to secure a larger maximum diameter L1 that can be used and to suppress the size of the hook as a whole, thereby improving operability. improves.
In addition, by connecting the stopper 4 to the mounting hole 10a provided in front of the connecting hole 9, the distance from the rotation center of the stopper 4 to the axis of the link member 7 and the distance from the rotation center of the open/close lever 5 to the axis of the link member 7 It is possible to increase the moving distance L2 of the stopper 4 with a small moving distance L3 of the opening/closing lever 5, and the space-saving structure can suppress the overall size of the hook, and even small hands can use it. Easy to grip and improve operability.

The present invention has been described above based on the illustrated examples, and the technical scope thereof is not limited thereto. For example, the material of each part constituting the safety belt hook can be freely selected from iron, aluminum, resin, etc., as long as it can ensure the safety of the user. Also, the group of parts constituting the stopper, opening/closing lever, and unlocking lever may be manufactured from a single material or from a plurality of materials. You may manufacture by molding. Further, the shape of each part is not limited to that shown in the figure, and a stopper capable of closing the engagement side opening from the inside can be operated by an opening/closing lever installed inside the hook body via a link member. is not limited to the above embodiment as long as it has a shape that can be fixed and released by the lock release lever. good. Furthermore, the types and materials of the pins used for connecting the hook body, the stopper, the opening/closing lever, the link member, and the lock release lever can be used as long as each connection is possible and the safety of the user can be ensured. are not limited.

1 Safety belt hook 2 Hook main body 3 Locking side opening 4 Stopper 5 Open/close lever 6 Unlock lever 7 Link member 8 Elasticity Member, 9... Connection hole, 10... Attachment hole, 14... Hook part, 22... Connection hole.

Claims (5)

a hook-shaped hook body having a locking side opening on the front side, a lower end of which is rotatably connected to a lower portion of the hook body to block the locking side opening from the inside of the hook body; A safety belt hook provided with a stopper that is movable between an open position that retracts to the locking side opening to open the locking side opening,
an opening/closing lever having a lower end rotatably connected to the lower portion of the hook body and connected to the stopper by a link member is provided on the inner side of the hook body behind the stopper;
The opening/closing lever is movable via the link member between a first position where the stopper is the closed position and a second position where the stopper is the open position. Safety belt hook. A lock release lever having a lower end rotatably connected to the lower portion of the hook body is provided on the rear outer side of the hook body,
The lock release lever is movable between a lock position where the opening/closing lever is held at the first position and a release position where the opening/closing lever is released and allowed to move to the second position. 2. The safety belt hook according to claim 1, wherein said unlocking lever is urged toward said locking position by an elastic member. 3. The hook for a safety belt according to claim 1, wherein a hook provided at the tip of said hook body engages with an engaging portion provided at the tip of said stopper. The safety belt hook according to any one of claims 1 to 3, wherein the stopper has a non-linear shape recessed toward the inside of the hook body. A connection hole for connecting a lifeline is provided in the lower part of the hook body,
5. The safety belt hook according to any one of claims 1 to 4, wherein the stopper is connected to the lower portion of the hook body in front of the connecting hole.

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