JP6494993B2 - Parallel 2-roll lanyard for safety belts and connecting fittings used therefor - Google Patents

Description

  The present invention relates to a safety belt mainly used in high-altitude work, and more particularly to a safety belt provided with a parallel two-winding lanyard.

  In order to prevent a worker from falling in the work site at a high place, the worker wears a safety belt composed of a belt part and a lanyard (rope or strap + hook or carabiner). Yes.

There are various types of lanyards, and they are properly used depending on the purpose and price.
The main types of lanyards are: (a) Rope lanyards (three ropes, eight ropes, blade ropes, straps, etc.), (b) Strap lanyards with a winder (hereinafter referred to as winding type) Lanyards) and (c) lanyards with strap type shock absorber function.
(A) A rope-type lanyard is a combination of a structure-side hook, a three-strand rope made of synthetic fiber, an eight-strand rope, a shock absorber, and a human body-side hook. It is a lanyard. In addition to the three-strand rope and the eight-strand rope, some rope sections use a synthetic fiber blade rope.
(B) Rewind-type lanyards are a combination of a winder body, a shock absorber, and a human body-side hook that winds a structure-side hook, a synthetic fiber strap, and a synthetic fiber strap in a telescopic manner. Is a lanyard.
(C) A lanyard with a strap type shock absorber function is a structure-side hook, a synthetic fiber strap and a human body-side hook connected to each other, and the synthetic fiber strap part is the core thread part of the inner layer when a large tensile load is applied. Is cut, and the strap portion as a whole is stretched greatly to have a function of keeping the impact load low. In other words, the lanyard has a strap that includes the function of the shock absorber.

When the worker moves, an operation to change the lanyard of the safety belt is necessary.
When there is only one lanyard in the safety belt, the operator removes the lanyard structure-side hook from the structure and switches it to the next position. If the moving distance is long, the above operation is repeated. While the lanyard structure side hook is removed from the structure, the human body and the structure are not connected. At this time, if the worker falls from a high place, the safety belt cannot prevent the fall. . In this way, when a worker works at a high place, the structure side hook of the safety lanyard is removed from the structure, and the state where the human body and the structure are not connected is referred to as a lanyard state. In this lanyard state, serious crashes often occur.

  Therefore, in order to prevent the occurrence of a no-lanyard state, there is a safety belt provided with two lanyards. In this case, the operator hangs the structure-side hook B of the other lanyard on the structure before removing the structure-side hook A of the one lanyard from the structure, and then removes the structure-side hook A from the structure. Perform the removal operation. If such an operation is repeated, even when the worker moves, the human body and the structure are always connected by the safety belt, and even if the worker falls accidentally, the crash can be prevented.

In the lanyard described in (0003), the (a) rope type lanyard other than the (b) take-up type lanyard and the (c) lanyard with a strap type shock absorber function usually have a total length of 1.7 m. When this lanyard is used for the harness-type safety belt, the rope portion between the lanyard and the structure-side hook hangs down in a state where the lanyard-side hook is hung on the D-ring on the back of the harness-type safety belt. In the harness-type safety belt, since the rope portion is on the back side, it is difficult for an operator to visually check the state where the rope is hanging down during work or movement. In addition, when working while crouching, the rope comes into contact with the ground or a structure.
In such a situation of use, there are accidents such as the rope part being caught in a rotating machine during work or moving, being caught by a protrusion on a structure, or the operator stepping on the rope part. stay up. Further, contact with the structural member may damage the fiber portion of the lanyard and cause a decrease in strength.

In the lanyard described in (0003), (b) the winding lanyard includes a structure-side hook, a strap, a winder body, a coupling fitting, a shock absorber, and a human body-side hook. The retractable lanyard stores the entire length of the strap in the winder main body when not in use, and stores the extra length of the strap in the winder main body when in use.
In response to the problem described in (0006), the winder main body eliminates the drooping of the strap, so that the strap can be caught in a rotating machine during the work or movement of the worker, the protrusion of the structure, etc. Since the possibility of accidents such as being caught on the door or falling down due to an operator stepping on the strap is reduced, the retractable lanyard is excellent in safety.

  In winding lanyards, the main component of the winder body is to be as compact and lightweight as possible, so one of the important needs of users is that straps are made of high-strength materials such as aramid fibers and polyarylate fibers. By using strong fibers, the necessary strength is ensured, and it is as thin and thin as possible. Since this high strength fiber has little elongation, the effect of buffering the impact load applied to the human body at the time of falling prevention is low.

  According to the law “Safety Belt Standard” issued by the Ministry of Health, Labor and Welfare regarding the safety belt, it is stipulated that the maximum impact load applied to the lanyard in the specified drop test method is 8 kN or less. However, in the case of a take-up lanyard using high strength fibers with little elongation, the impact load applied to the human body exceeds 8 kN. Therefore, in the case of a take-up lanyard using high strength fibers with little elongation, it is essential to equip a shock absorber in order to keep the impact load low. Also, except for lanyards that have a shock absorbing function on the strap itself, in order to reduce the impact on the human body by reducing the impact load applied to the human body as much as possible when preventing the fall, other than the retractable lanyard, It is required to equip a shock absorber.

Some conventional retractable lanyards have a shock absorber connected between the strap and the structure-side hook. However, there is a problem in the next use situation.
When the lanyard of the safety belt is locked to a member larger than the diameter of the structure-side hook, the hook cannot be directly hooked on the member. Therefore, the structure-side hook and the shock absorber at the lanyard tip are connected to the member. The structure side hook is hooked on the strap and locked to the member, that is, the hooking method is used. In this case, since the structure side hook is hooked on the human body side than the shock absorber, the shock absorber is located in the ring that is turned around the structure, and the shock load generated when the human body is prevented from falling is directly applied. Therefore, the shock absorber cannot function sufficiently without being applied to the shock absorber, and as a result, a large impact load is applied to the human body. This large impact load may damage the human body, and in the worst case, the impact load may exceed the strength of the safety belt, and the safety belt may break and the human body cannot be prevented from falling.

  Therefore, the conventional lanyard in which the shock absorber is disposed between the structure-side hook and the strap has a problem in safety in the case of turning. Therefore, it is necessary to arrange the shock absorber closer to the human body than the winder.

  The winder lanyard winder body has a complicated structure and a large number of parts, and the strap of the winder lanyard uses high-strength fibers with high material costs, so compared to the most popular rope lanyards Winding lanyards are expensive. When using two roll-up lanyards, the cost is twice that of a single roll-up lanyard and the product is more expensive than the conventional one. Safety belts with two take-off lanyards are not very popular.

In addition, when two lanyards are attached to the D ring of the harness-type safety belt, the weight is heavy, which is a burden for an operator who works for a long time.
In addition, since the two independent lanyards are bulky and may contact the structure when working in a narrow place, the use of the two independent lanyards adversely affects workability.

  In the conventional harness-type safety belt, two take-up lanyards equipped with shock absorbers are independently attached to the D-ring on the back. Since the two lanyards are heavy and bulky, they may be disliked by workers. It is recognized that the safety belt is legally used even in the single lanyard type instead of the two lanyard type, and since the work can be performed, the worker overconfidents that his work is safe, and the construction manager Without obtaining the approval, one lanyard of the two lanyards may be removed from the safety belt, and a one lanyard safety belt may be attached to perform dangerous work. For the construction manager, for the safety of the operator, two lanyards are integrally formed, and it is hoped that the structure cannot be removed.

Conventionally, two independent winding lanyards are attached in a state of being hung on one D-ring of a harness-type safety belt. The D ring is a substantially D-shaped metal fitting, and the portion of the lanyard that engages the human body side hook is an elliptical bar material having an elliptical cross section. Accordingly, the two human body side hooks of the lanyard are locked in the state where the respective side surfaces are in contact in the vicinity of the center position of the arc of the D ring.
The human body side hook is stipulated by the Ministry of Health, Labor and Welfare Notification “Safety Belt Standard” to be equipped with a locking device that can be removed only by two or more consecutive operations. The hook includes a locking device and a locking device having a function of locking the opening and closing of the locking device.

  In use, for example, when the right side lanyard is used and the structure side hook is hung on the left side structure by an operator, if you try to move in the right hand direction, the left side lanyard must be removed before removing the right side lanyard. Is applied to the structure on the right side of the human body. In the two lanyards connected to the D-ring on the back, the human side hook and winder body of the right lanyard were pulled to the left, and the human body hook and winder body of the left lanyard were pulled to the right. It becomes a state. In such a case, the left and right human body side hooks may come into contact with each other, and a pressing force may be applied to or entangled with the human body side hook release prevention device or locking device. There is a possibility of opening without. As a coincidence, the engagement between the human body side hook and the D ring of the safety belt is released, and there is a possibility that a lanyard state is obtained.

  Since the winder body is connected to the D-ring on the back of the harness-type safety belt via a human body hook and a shock absorber, the winder body is a harness type that is the attachment point of the lanyard Located about 20 cm below the D ring of the safety belt.

  When an operator wearing a safety belt intends to use the lanyard from now on, the winder main body is hung from the D-ring on the back, and the strap feeding opening of the winder main body is directed substantially vertically downward. When the operator uses the lanyard from this state, the operator pulls the strap with the structure side hook in his hand and performs the operation of locking the structure side hook to the structure, so the strap is almost horizontal. Pulled in the direction. At this time, the direction of the take-out port of the winder body and the direction in which the strap is actually pulled out are greatly different, so the strap is bent and squeezed at the feed port of the winder body. At this time, the operation of pulling out the strap feels heavy. Even when the strap is stored, the strap is not stored smoothly as in the case of pulling out, and the operability is poor in pulling out and storing the strap.

  In the take-up lanyard, the strap is repeatedly pulled out and stored, so that the strap bends and squeezes, so that the strength of the strap may be greatly reduced by using it for about two years. Pre-start inspection is essential for the safety belt, and if the strap is confirmed to be damaged by inspection, the strap needs to be discarded. This is an economic burden for the operator. In addition, when the inspection is insufficient, there is a possibility of using a wind-up lanyard that cannot maintain a sufficient strength against a large impact load at the time of preventing a crash, which is not preferable in terms of safety.

The strap is constantly applied in the direction of being wound around the winder body by the mainspring spring built into the winder body. When performing the operation to lock the winder lanyard to the structure, the spring spring The strap is pulled out against the urging force in the winding direction.
That is, when pulling out the strap, the winder body is pulled in the direction of pulling out the strap by the biasing force of the mainspring spring, so that the position of the D ring of the harness-type safety belt that is the attachment point of the human body side hook is the center, The winder body moves like a pendulum. At this time, since the shock absorber is located between the human body side hook and the winder body and has a distance of 20 to 30 cm, the swing width of the winder body is increased. If the strap on the lanyard is locked or removed from the structure, or if the operator moves, the slack of the winder will hang vertically downward from the D-ring on the back. Return to the state.

In this way, each time the strap is pulled out, stopped, or wound, the heavy winder body located on the operator's back moves greatly. This is uncomfortable for the operator and is particularly uncomfortable when colliding with the back.
At this time, if the greatly wound winder main body collides with the other winder main body, the winder main body may be damaged. Some of the winder main bodies have an operation lever for a function such as temporarily stopping the feeding of the strap. In this case, if the winder main body that is greatly shaken collides with the other winder main body, the operation lever may be damaged.
In the case of a harness-type safety belt, the winder main body is located on the back of the worker, so that the worker may not notice even if the winder main body is damaged during the work.
If the winder main body is damaged in this manner, functions such as feeding and winding of the strap are impaired, and there is a possibility that the function that the harness-type safety belt should originally function cannot be exhibited.

In Japanese Patent Application Laid-Open No. 2011-224257, in order to improve the wearability, two shock absorbers are connected to the D ring on the back in the harness type safety belt, and the winder body is connected to each shock absorber. In addition, one in which each winder body is temporarily fixed to both shoulders of a wearer of a safety belt is disclosed. In this case, two shock absorbers are required, which is heavy and expensive.
Moreover, in this invention, since the winding type lanyard is disposed on both shoulders above the D-ring on the back, the strap of the winding type lanyard must be positioned in front of the neck side or front when working. There were times when it became more of an obstacle to work. In addition, when a worker carries construction materials such as a single pipe, the winder temporarily fixed to both shoulder portions is in the way, and the construction material cannot be carried on the shoulder. In addition, when the work for carrying the material on the shoulder is performed, there is a possibility that the winder main body, the belt of the harness-type safety belt, or the like may be damaged, and the function that the harness-type safety belt should originally function cannot be exhibited.
Therefore, unlike the present invention, the winding type lanyard that is widely used at present is connected by a method of hanging downward from the D-ring on the back of the harness-type safety belt.

JP 2011-224257 A

  As described above, in order to perform safe work at high places, it is desirable to have two lanyards, and to reduce the impact on the human body by reducing the impact load applied to the human body as much as possible when preventing a crash. Therefore, it is clear that it is necessary to provide a shock absorber, but in addition, there are the following problems.

The main problem to be solved by the present invention is:
(1) In a lanyard where a shock absorber is placed between the hook on the structure side and the strap of the winder, the shock absorber may not function when a fall is prevented and a large impact load may be applied to the human body. The shock absorber must be placed closer to the human body than the winder because it was dangerous. (2) The cost is high when two wind-up lanyards are used. (3) Two independent lanyards are safety belts. The two independent lanyards are bulky and may be in contact with the structure when working in narrow spaces. There is also an adverse effect on workability. (4) The worker removes one lanyard from the two lanyards without obtaining the consent of the construction manager. Wearing a safety belt may cause dangerous work. (5) Contact between the human body side hooks may cause deformation of the human body side hook disengagement device or locking device and disengage from the D-ring. (6) With the winder body hanging from the D-ring on the back, the strap outlet of the winder body is facing substantially vertically downward, and the direction of the outlet of the winder body and the actual strap Because the pull-out direction is significantly different, the strap bends and squeezes at the take-out port of the winder body, resulting in a large contact resistance when pulling out and storing the strap, and poor operability. (7) Winder body The strap is bent and squeezed because the strap is repeatedly pulled out and stowed in a state in which the direction of the feeding opening of the strap and the direction in which the strap is actually pulled out are greatly different. (8) When two independent take-up lanyards are attached to a single D-ring of a harness-type safety belt, the strap is connected from the D-ring to the winder body. Because the distance is long, the two winder main bodies swing separately like a pendulum, and the winder main bodies may collide with each other and be damaged.
An object of the present invention is to provide a parallel two-winding lanyard that has good workability and operability, is highly safe, lightweight, compact, and inexpensive in view of the problems of the prior art.

The conventional lanyard is provided with one human body side hook and one shock absorber, and the two lanyards are respectively connected to the D ring of the safety belt so as not to generate a lanyard state. That is, in the state where the lanyard is attached to the safety belt, two human body side hooks and two shock absorbers are equipped.
On the other hand, in the lanyard according to the present invention, one human body side hook and shock absorber are used, one human body side hook is connected to one end of one shock absorber, and a connecting bracket is attached to the other end portion of the shock absorber. The two winder main bodies are expanded on the same plane by a predetermined angle and connected in parallel, and the straps can be taken into and out of the respective winder main bodies so that they can be retracted and stored. A parallel two-winding lanyard with a structure-side hook at the tip.

The two winder bodies are connected to the connecting bracket with a gap so that they do not come into contact with each other, but the approximate connecting bracket is a ring with an approximately isosceles triangle shape, and the bottom is the connection side with the shock absorber. The other two oblique sides serve as connecting sides with the winder body, and an angle formed by two lines perpendicular to the connecting side and passing through the center of the winder body forms 30 ° or more.
Preferably, the connection fitting has a structure in which a partition, a protrusion, or a spacer is provided on the annular portion side at the apex of the approximately isosceles triangle shape so as not to contact between the two winder main bodies.

  In the case of the parallel two-winding lanyard according to the embodiment of the present invention, since the shock absorber is disposed between the human body side hook and the two winder main bodies, any one of the two is prevented when the fall is prevented. Even when a lanyard is used, a load is applied to the shock absorber so that the shock absorber can reduce the impact load and reduce the influence on the human body.

  Since the shock absorber is connected to the hook on the human body side, even if the structure side hook of the lanyard is turned around, the shock absorber functions when the fall is prevented and the impact load applied to the human body is reduced. Can be reduced with certainty.

  By using a lanyard as a two-roll lanyard in parallel and using one shock absorber and two human side hooks, a lightweight and compact lanyard can be provided. While reducing the physical burden, the cost can be reduced and an inexpensive product can be provided.

  Conventionally, in order to connect two independent lanyards to a single D-ring, there was a risk that the two human-side hooks would be damaged and come off the D-ring. In the invention, by using one human body side hook, the cause of damage to the human body side hook can be removed, the possibility of detachment from the D ring can be eliminated, and safety can be improved.

  Also, when the operator uses the lanyard to hold the structure-side hook in his hand and pulls out the strap and locks it to the structure, the two reels of the winder main body are fed out of the strap. The direction of drawing out and the direction of feeding out the winder are approximated. For this reason, the strap does not bend greatly at the feed opening of the winder body, and smooth feeding and winding can be performed.

  Further, since the strap is bent at the feed opening and damage caused by ironing is reduced, the durability is improved and the service life is extended.

  The two winder bodies are spaced apart, opened at a predetermined angle, and arranged in a state where the mutual positional relationship does not change and connected to the connecting bracket, so that the winders do not collide with each other. The winder can be prevented from being damaged.

  Embodiments according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view of a parallel two-winding lanyard according to an embodiment of the present invention, and FIG. 2 is a side view thereof. This lanyard includes a human body side hook 6, a shock absorber 5, a connecting bracket 4, two winder main bodies 1 a and 1 b, straps 2 a and 2 b wound around each winder and structure side hooks 3 a and 3 b. It has.

The human body side hook 6 is provided with a hook-shaped portion for locking to the D-ring of the harness-type safety belt at one end and an annular portion at the other end, and a belt constituting the shock absorber 5 is inserted into the annular portion and folded back. It is connected with the shock absorber 5 by sewing.
One end of the shock absorber 5 is connected to the human body hook 6. The other end of the shock absorber 5 is connected to the connection fitting 4 by inserting a belt constituting the shock absorber 5 into the annular portion of the connection fitting 4 and folding it back.
A shock absorber 5 is connected to a part of the connecting metal part 4, and two winder main bodies 1a and 1b are connected in parallel to the other part.
The straps 2a and 2b wound around the winder body 1a and 1b are respectively inserted into the annular portions of the structure-side hooks 3a and 3b and folded to be sewn, so that the structure-side hooks 3a and 2b are wound. It is connected with 3b.

  As shown in FIGS. 4 and 5, conventionally, when two separate lanyards are used, two human body side hooks are required to connect the lanyard and the harness-type safety belt, and two human body side hooks are used. Although the human body side hooks 6a and 6b may be damaged and come off from the D ring of the safety belt due to the contact between the 6a and 6b, in the present invention, the human body side hook is the same as the human body side hook 6 as shown in FIG. Since there is only one piece, the cause of damage that comes into contact with other components is eliminated, and there is no possibility of detachment from the D-ring of the safety belt, thus increasing safety.

When the human body falls and prevents the safety belt from falling, the load is transmitted from the safety belt worn by the operator to the structure through the human body side hook, shock absorber, winder body, strap, and structure side hook.
In the case of two conventional lanyards, as shown in FIGS. 4 and 5, each of the two lanyards has separate shock absorbers 5a and 5b, and the impact load when the fall is prevented is applied to the structure. In addition to the locked lanyard shock absorber, the shock absorber functions. In this case, no load is applied to the shock absorber of the other lanyard that is not locked to the structure, and the shock absorber does not function. Therefore, in terms of function, if one shock absorber is used and the shock absorber is connected to both of the two lanyards, the impact at the time of crash prevention can be achieved regardless of which lanyard is locked to the structure. The load can be reduced. That is, only one shock absorber is required.
In the present invention, as shown in FIGS. 1 and 2, two winder main bodies 1a and 1b are connected to one shock absorber 5 via a connecting fitting 4d.

  In addition, as shown in FIGS. 6, 7, and 8, the belt constituting the shock absorber 5 is folded back to the D ring of the safety belt instead of using the human body side hook as a means of connecting the lanyard and the D ring of the safety belt. There is also a method in which one end of the shock absorber 5 is directly connected to the D ring 7 of the safety belt by stitching.

  In addition, as shown in FIGS. 19 and 20, as a means for connecting the lanyard and the safety ring D ring 7, instead of using a human body side hook, a U-shaped part 9 is inserted into the safety belt D ring 7, By inserting a rivet 91 or a bolt and fastening it to the U-shaped component 9 at the terminal portion where the belt constituting the shock absorber 5 is folded and stitched, one end of the shock absorber 5 is connected to the D ring 7 of the safety belt. There is also a way to connect.

The connecting metal fittings 4 are arranged and connected with an interval so that the two winder main bodies 1a and 1b do not contact each other.
As shown in FIG. 11, the connecting metal fitting 4a is a ring having a substantially isosceles triangular shape. Here, the ring is an instrument having a shape in which the outer shape is connected like a donut and has one or more holes inside. In the connecting metal fitting 4a, two oblique sides having a substantially isosceles triangular shape are used as connecting sides 42a to the two winder main bodies 1a and 1b. An angle formed by two lines passing through the connecting side 42a and the centers of the winder main bodies 1a and 1b forms 30 ° or more.
This angle of 30 ° is a guideline when the winder body is arranged in consideration of the positional relationship that does not interfere with each other, although it depends on the shape of the winder body.
The strap outlets of the two winder main bodies 1a and 1b connected to the connecting metal fitting 4a face away from each other, and the straps 2a and 2b fed from the two winder main bodies 1a and 1b come into contact with each other. There is nothing.

As shown in FIG. 11, the connection fitting 4a is a ring having an approximately isosceles triangle shape, and the shock absorber 5 is connected to the connection side 41a on the bottom side, and the connection side 42a of the two oblique sides of the approximately isosceles triangle shape. The fitting 4a and the winder main bodies 1a and 1b are connected by inserting the two winder main bodies 1a and 1b, respectively. The winder main body 1a and the winder main body 1b do not collide by arranging the winder main bodies 1a and 1b on the connecting sides 42a and 42b of the two oblique sides having a substantially isosceles triangle shape.
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As shown in FIG. 12, the connection fitting 4b is a ring having an approximately isosceles triangle shape, and includes a base connection side 41b and two oblique connection sides 42b. The connecting side 41b and the connecting side 42b are fastened to each other with rivets 43b or bolts to form an integral part.
The shock absorber 5 is connected to the connection side 41b, and two winder main bodies 1a and 1b are arranged on the two connection sides 42b, so that the connecting metal fitting 4b and the winder main bodies 1a and 1b are connected. The

As shown in FIG. 13, the connection fitting 4 c is a ring having an approximately isosceles triangle shape and has two rings, and includes a connection side 41 c on the bottom side and a connection side 42 c on the two oblique sides. The connecting side 41c and the connecting side 42c are fastened to each other with rivets 43c or bolts to form an integral part.
The connection side 41c on the bottom side has an elongated ring portion, and the shock absorber 5 and the connecting metal fitting 4c are connected by inserting the belt of the shock absorber 5 into the ring portion, turning it back and sewing it. By bending the connecting sides 42c of the two oblique sides at the center, the winder main body 1a and the winder main body 1b respectively disposed on the left and right of the bent portion do not collide.

As shown in FIG. 14, the connection fitting 4d is a ring having an approximately isosceles triangle shape and has three ring portions, and includes a connection side 41d on the bottom side and a connection side 42d on the two oblique sides. The connecting side 41d and the connecting side 42d are fastened to each other with rivets 43d or bolts to form an integral part.
The two oblique sides have two ring parts that are divided into two at the center of a substantially isosceles triangle. The winder main bodies 1a and 1b are inserted into and connected to the two ring portions of the oblique sides. Since there is a partition member 420d between the two ring portions that connect the winder main bodies 1a and 1b, the winder main bodies 1a and 1b do not contact and collide with each other.

  Further, as shown in FIG. 15, the connecting metal fitting 4e is a ring having a substantially isosceles triangle shape, and a projection 420e as a partitioning member is provided on the ring side at the position of the bent vertex. Since the projection 420e is disposed between the two winder main bodies 1a and 1b, the two winder main bodies 1a and 1b do not contact and collide with each other.

In addition, as shown in FIG. 16, the connecting metal fitting 4f is a ring having a substantially isosceles triangular shape, and includes a connecting side 41f on the bottom side and connecting sides 42f on two oblique sides. The connection side 41f and the connection side 42f are fastened to each other with rivets 43f or bolts to form an integral part.
A spacer 44f as a partition member is inserted and arranged at the position of the bent vertex of the connecting side 42f. The spacer 44f is, for example, a cylindrical body, and is opened by cutting one portion of a circular cross section like a C-shape with a substantially cylindrical shape and a Roman letter. Since the spacer 44f is disposed between the two winder main bodies 1a and 1b, the two winder main bodies 1a and 1b do not contact and collide with each other.

As shown in FIG. 11, in the connection fitting 4a, an angle formed by two lines orthogonal to the two connection sides 42a and passing through the centers of the winder main bodies 1a and 1b is 30 ° or more.
FIG. 17 shows a case where the angle formed by two lines orthogonal to the two connecting sides 42g and passing through the centers of the winder main bodies 1a and 1b is 30 °. When the two winder main bodies 1a and 1b are arranged so as not to contact each other with the angle being 30 ° or less, the connecting side 42g to which the two winder main bodies 1a and 1b are attached needs to be widened. Since the metal fitting 4g is inferior in compactness, the rigidity is reduced and the metal fitting 4g is easily deformed, and the strength is reduced with respect to the load at the time of the fall prevention.
FIG. 18 shows a case where an angle formed by two lines orthogonal to the two connecting sides 42h and passing through the centers of the winder main bodies 1a and 1b is 120 °. When the angle is increased to 120 ° or more, the winder main bodies 1a, 1b and the shock absorber 5 are at an angle of 60 ° or more, but when the fall is prevented, the winder main bodies 1a, 1b, the coupling metal 4h, Since a load is applied linearly to the absorber 5, the belt at the end of the shock absorber 5 moves to a narrow bent portion between the connection side 41h and the connection side 42h of the connection fitting 4h, and the belt is compressed in the width direction. If a non-uniform load is applied, the strength of the belt decreases, which is not preferable for safety.

  The connecting metal fitting 4g shown in FIG. 17 is a ring. If the shape is such that a shock absorber is connected to a part and two winder main bodies are arranged in parallel and connected to the other part, the general shape is approximately two. In addition to an equilateral triangular shape, an approximate pentagonal shape, an approximate elliptical shape, or an approximate D shape may be used.

  As shown in FIGS. 9 and 10, when the carabiner 6c provided with a locking device that is not opened unless two or more operations are continuous is used as a human body side hook, the same effect is obtained.

1 is a front view of a parallel two-winding lanyard according to an embodiment of the present invention. 1 is a side view of a parallel two-winding lanyard according to an embodiment of the present invention. It is a front view of a harness type safety belt provided with a parallel two-winding lanyard according to one embodiment of the present invention. It is a front view of the harness type safety belt provided with two conventional independent winding type lanyards. It is a front view of the harness type safety belt provided with two conventional independent rope type lanyards. It is a front view of the harness type safety belt which equips the D ring of a harness type safety belt with the parallel 2 series winding lanyard which concerns on one Embodiment of this invention so that attachment or detachment is impossible. It is a front view of the state where the parallel 2 series winding type lanyard concerning one embodiment of the present invention was connected with D ring of a harness type safety belt. It is a side view of the state where the parallel 2 series winding type lanyard concerning one embodiment of the present invention was connected with D ring of a harness type safety belt. It is a front view of the state where the parallel 2 series winding type lanyard concerning one embodiment of the present invention was connected with D ring of a harness type safety belt. It is a side view of the state where the parallel 2 series winding type lanyard concerning one embodiment of the present invention was connected with D ring of a harness type safety belt. It is a front view of the detailed view of the connection metal fitting part concerning one embodiment of the present invention. It is a front view of the detailed view of the connection metal fitting part concerning one embodiment of the present invention. It is a front view of the detailed view of the connection metal fitting part concerning one embodiment of the present invention. It is a front view of the detailed view of the connection metal fitting part concerning one embodiment of the present invention. It is a front view of the detailed view of the connection metal fitting part concerning one embodiment of the present invention. It is a front view of the detailed view of the connection metal fitting part concerning one embodiment of the present invention. It is a front view of the detailed view of the connection metal fitting part concerning one embodiment of the present invention. It is a front view of the detailed view of the connection metal fitting part concerning one embodiment of the present invention. It is a front view of the state where the parallel 2 series winding type lanyard concerning one embodiment of the present invention was connected with D ring of a harness type safety belt. It is a side view of the state where the parallel 2 series winding type lanyard concerning one embodiment of the present invention was connected with D ring of a harness type safety belt.

1, 1a, 1b ... Winder body 2, 2a, 2b ... Winder strap 3, 3a, 3b ... Structure side hooks 4, 4a, 4b, 4c, 4d, 4e, 4f , 4g, 4h, 4i..., Connecting fittings 41, 41b, 41c, 41d, 41e, 41f, 41g, 41h, 41i ... connecting sides 42, 42b, 42c, 42d, 42e, 42f, 42g of the connecting fitting. 42h, 42i ... Connecting metal side 420d ... Connecting metal partition 420e ... Connecting metal projections 43, 43b, 43c, 43d, 43e, 43f ... Rivet 44f ... Spacers 5, 5a , 5b ... Shock absorber 6, 6a, 6b ... Human body side hook 6c ... Carabiner 7 ... D ring 8 ... Harness type safety belt 9 ... U-shaped component 91 ... Rivet 10a, 1 A line passing through the center of the winder body perpendicular to the b · · · connecting edges

Claims (6)

At the other end of the shock absorber with a connection to the safety band at one end, two winder main bodies are expanded in parallel on the same plane by a predetermined angle via a substantially isosceles triangular connecting bracket. A parallel two-winding lanyard characterized in that the straps can be taken into and out of each winder body so that the straps can be freely wound and stored, and a hook on the structure side is provided at the tip of each strap. On the other end of the shock absorber having a connection to the safety band at one end, two winder main bodies having a wide coupling portion between the winder and the connecting bracket in parallel through the connecting bracket are flush with each other. Parallel 2 characterized by having a structure in which the straps are inserted into the respective winder main bodies so that the straps can be taken in and out freely, and the structure side hooks are provided at the tips of the straps. Continuous winding lanyard. The parallel two-winding lanyard according to claim 1 or 2 , wherein the connecting portion is formed by a human body side hook that can be engaged with and disengaged from the safety belt predetermined portion. Connections, parallel twin retractable lanyard according to claim 1 or claim 2, wherein the configuring suturing portion of suturing directly to the safety belt predetermined portion. A ring with an approximate isosceles triangle shape, the bottom side is the connection side with the shock absorber, the other two sides are the connection sides with the winder body, and the center of the winder body is perpendicular to the connection side. The connecting bracket used in claim 1 or claim 2, wherein an angle formed by two passing lines is 30 ° or more. 6. The coupling fitting according to claim 5 , wherein a partition member is provided between each coupling side.

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