JP7448320B2 - retractable lanyard - Google Patents

Description

One aspect of the present disclosure relates to a retractable lanyard.

Patent Document 1 describes a safety belt that prevents a wearer from falling. This safety belt includes a torso belt worn by the wearer and a lanyard, and the lanyard is connected to the torso belt. The lanyard includes a shock absorber part fixed to the body belt, a winder connected to the shock absorber part, and a hook attached to the tip of a strap extending from the winder.

The retractor is capable of adjusting the length of the strap to be pulled out from the retractor to which the hook is attached, and the shock absorber section is provided between the retractor and the torso belt. Further, the shock absorber section is provided with a casing and a band-shaped belt, and the band-shaped belt is housed in a folded state inside the casing. One end of the belt-shaped belt extends out of the casing from an insertion hole formed in the casing and is connected to a winder, and the other end of the belt-shaped belt is connected to a trunk belt.

If the worker falls from the structure and a tensile load is applied to the lanyard while the torso belt is attached to the worker and the hook is attached to the structure's attachment equipment, the loosened strap will be pulled. Load is applied. At this time, Lanyard receives a shock. Further, the band-shaped belt of the shock absorber section is pulled toward the winder, and the above-mentioned insertion opening is widened, and the casing of the shock absorber section is divided. Then, the belt-shaped belt that has been folded inside the casing is unfolded, thereby alleviating the impact on the worker.

Japanese Patent Application Publication No. 2018-126184

Incidentally, there is a growing need for fall arrest equipment that includes a full harness rather than a torso belt. In a full harness, the retractable lanyard is attached to the wearer's back, and in the case of a torso belt, the attachment point is at the wearer's waist. In this way, the full harness and the torso belt have different attachment positions relative to the wearer. Therefore, although the position of each part of a retractable lanyard plays an important role in safety and fit for the wearer, there is room for improvement in the above-mentioned and conventional retractable lanyards.

A retractable lanyard according to one aspect of the present disclosure is a retractable lanyard that prevents a wearer from falling from a structure, and includes a hook that is attached to the structure and a shock absorber that absorbs a shock applied to the wearer. , a winder for winding up the strap extending from the shock absorber part, and a connector to be attached to the wearer, in this order, and the length of the shock absorber part is 30% of the total length of the retractable lanyard. That's all.

In the retractable lanyard according to one aspect described above, a hook attached to a structure, a shock absorber section, a retractor, and a connector attached to a wearer are arranged in this order. Thus, when the fall arrest device is a full harness and the retractable lanyard is worn such that the connector is located on the back of the wearer, the retractor adjacent to the connector is also located on the back of the wearer. Together, the shock absorber portion is positioned around the waist of the wearer and the hook is attached to the structure. Therefore, the shock absorber part can be fitted around the waist of the wearer, and the connector, winder, and hook can be prevented from coming into contact with the vicinity of the wearer's head. Further, in this retractable lanyard, the ratio of the shock absorber portion to the total length of the retractable lanyard is 30% or more. Therefore, the shock absorber portion having a length ratio of 30% or more can be made to follow the wearer's body and fit along the wearer's body, reducing discomfort when worn and improving the fit. can be increased. As a result, it is possible to improve the fit and improve safety.

The hook includes a body portion that hooks onto the structure, and the thickness of the shock absorber portion may be 10 times or less than the thickness of the body portion.

The retractable lanyard described above may have a total weight of 1 kg or less.

The length of the shock absorber portion may be 18 cm or more.

The hook includes a body portion that hooks onto a structure, and the body portion may have a strength of 11.5 kN or more.

According to one aspect of the present disclosure, a feeling of fit can be improved.

FIG. 1 is a diagram showing an example of a retractable lanyard according to an embodiment being worn by a wearer. FIG. 2 is a perspective view showing the retractable lanyard of FIG. 1. FIG. 3 is a perspective view showing the belt of the shock absorber section of the retractable lanyard shown in FIG. 1. FIG. 4 is a diagram schematically showing the state of the belt of the shock absorber section in FIG. 3. FIG. FIG. 5 is a side view showing the retractable lanyard of FIG. 1. FIG. 6 is a side view of the retractable lanyard of FIG. 1 viewed from a different direction from that of FIG.

Hereinafter, embodiments for implementing a retractable lanyard according to the present disclosure will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description will be omitted as appropriate. Furthermore, for ease of understanding, some parts of the drawings may be simplified or exaggerated, and the dimensional ratios and the like are not limited to those shown in the drawings.

As used herein, "fall prevention equipment" refers to equipment that prevents people from falling, and includes, for example, equipment that prevents workers, including those working at heights, from falling from structures. I'm here. "Structures" refer to facilities including buildings, bridges, dams, ladders, heavy machinery, telephone poles, scaffolding, steel towers, and gondolas. Additionally, "fall arrest equipment" may include a lanyard and a full harness. A "full harness" is a lanyard that supports the load placed on the wearer's body on the wearer's shoulders, waist, thighs, etc. when stopping the person wearing the lanyard (referred to as the "wearer" in this disclosure) from falling. It shows an instrument with a structure.

FIG. 1 shows an example of a retractable lanyard 1 according to the present embodiment being worn by a wearer M. FIG. 2 shows a retractable lanyard 1 according to this embodiment. FIG. 3 shows a belt 31 housed inside a shock absorber section 30, which will be described later. If the retractable lanyard 1 is attached to a full harness, the retractable lanyard 1 may be used in structures with a height of more than 2 m.

For example, a shoulder belt B1, a back belt B2, a thigh belt B3, and a pelvic belt B4 are attached to the wearer M, and a pair of shoulder belts B1 and a pair of back belts B2 located on the back M2 of the wearer M are attached to the wearer M. An annular member C is provided in the intermediate portion. In the following description, the shoulder belt B1, back belt B2, thigh belt B3, and pelvis belt B4 may be collectively referred to as attachment equipment (full harness) B. The annular member C is, for example, a D ring.

The retractable lanyard 1 includes a connector 10 that is attached to the wearer M, a retractor 20 that retracts the strap 21, and a shock absorber section 30 in which a belt 31 that absorbs shocks applied to the wearer M is folded inside. , and a hook 40 that is attached to a structure. The retractable lanyard 1 is attached via a full harness and an annular member C, for example.

Note that although FIG. 1 shows an example in which the wearer M is holding the hook 40 with his/her hand, when the hook 40 is not attached to a structure, the hook 40 is positioned in front of the shoulder M1 of the wearer M. It may also be hung on the annular part. In this case, the annular portion is fixed, for example, to a shoulder belt B1 located in front of the shoulder M1 of the wearer M. The weight of the retractable lanyard 1 is, for example, 0.3 kg or more and 1.5 kg or less. Further, the weight of the retractable lanyard 1 may be 0.3 kg or more and 1.0 kg or less. In this way, when the weight of the retractable lanyard 1 according to this embodiment is 1 kg or less, further weight reduction is achieved. The upper limit of the weight of the retractable lanyard 1 may be 0.9 kg, 0.8 kg, 0.7 kg, or 0.6 kg. Further, the lower limit of the weight of the retractable lanyard 1 may be 0.4 kg or 0.5 kg.

The retractable lanyard 1 includes a hook 40, a shock absorber section 30, a retractor 20, and a connector 10 in this order. That is, the hook 40, the shock absorber section 30, the winder 20, and the connector 10 are arranged along a constant length direction D1. By arranging the hook 40, the shock absorber section 30, the winder 20, and the connector 10 in this order, the connector 10 and the winder 20 face the back M2 of the wearer M, and the hook 40 faces the back M2 of the wearer M. attached to the front of shoulder M1 or to a structure. Therefore, the connector 10, the winder 20, and the hook 40 can be prevented from hitting the head M3, neck M4, and face M5 (near the head M3) of the wearer M.

The connector 10 is a part that connects the retractable lanyard 1 to the mounting equipment B. In this embodiment, the connector 10 is a part fixed to an annular member C located on the back M2 of the wearer M, and the winder 20 is provided at a position adjacent to the connector 10. In addition, in the retractable lanyard 1, the shock absorber part 30 extends from the retractor 20 and is arranged along the waist M6 of the wearer M, and in this state, the hook 40 is attached to the above-mentioned annular part in front of the shoulder M1. It gets caught. The connector 10 may be attached directly to the web portion of the attachment facility B, for example, without using the annular member C.

The connector 10 may be made of steel, steel, iron, or aluminum, or may be made of an alloy, for example. In addition, the connector 10 does not break when a tensile load of 11.5 kN is applied using the tensile test method specified in JIS T8165 (Fall Arrest Devices) or a similar method, and it continues to function as the connector 10. It does not deform to the extent that it is lost, or it does not lose its function as a retaining device. That is, the connector 10 does not deform to the extent that it loses its function even when a tensile load of 11.5 kN is applied, and has a strength of 11.5 kN or more. The weight of the connector 10 is, for example, 0.02 kg or more and 0.2 kg or less. Moreover, the connector 10 may have a double lock mechanism or a triple lock mechanism. The connector 10 is, for example, a carabiner that includes a C-shaped frame portion 11 and a gate portion 12 that opens and closes the connector 10. Note that the material, weight, and shape of the connector 10 are not limited to the above examples and can be changed as appropriate.

The winder 20 is a part that winds up the strap 21 passing inside the shock absorber section 30. The strap 21 is made of, for example, a web (membrane-like sheet member formed of fibers) having a strength of 22 kN or more. The strap 21 is made of a material that does not break when a tensile load of 22 kN is applied, for example, in a tensile test specified in JIS T8165 (fall arrest equipment).

The winder 20 includes, for example, a strap 21, a housing 22 that accommodates a rotating shaft and rotating blades to be described later, and a connecting portion 23 to which the connector 10 is connected. The strap 21 is wound around a coil member provided inside the housing 22. The length (total length) of the strap 21 may be, for example, 0.5 m or more and 2.9 m or less, or 0.5 m or more and 1.4 m or less.

In this embodiment, the number of coil members around which the strap 21 is wound is one, thereby realizing a reduction in size and weight of the winder 20. The housing 22 has an opening 22b on the shock absorber section 30 side through which the strap 21 extends. The connecting portion 23 is, for example, an annular portion fixed to the housing 22, and the winder 20 is connected to the connector 10 with the frame portion 11 of the connector 10 passed through the connecting portion 23.

When the winder 20 receives a tensile load in the tensile direction X that causes the wearer M to fall away from the hook 40 due to, for example, falling from a structure, the strap 21 extends a certain amount and locks. The winder 20 has a strength capable of maintaining a locking function when a tensile load of 8 kN (or 6 kN) is applied in a tensile test specified in JIS T8165 (fall arresting equipment). That is, the winder 20 has a strength of 8 kN (or 6 kN) or more. The locking function of the winder 20 is such that, for example, a rotary blade that rotates around a rotating shaft provided inside the winder 20 rotates as the strap 21 extends and is caught radially outward by centrifugal force. realized by

By the way, in this embodiment, the shock absorber part 30 reduces the free fall distance in the retractable lanyard 1 (the height of the hook attachment equipment, etc. is reduced from the height at which the full harness is connected when wearing the full harness). (plus the lanyard length) may be kept to 4.0 m or less. Note that the measurement test based on the free fall distance was conducted in accordance with the drop test of JIS T8165 (fall prevention equipment), and the free fall distance in the drop test was 1.8 m or more and 4.0 m or less. Further, when the free fall distance of the retractable lanyard 1 is 1.8 m or more and the impact load of the retractable lanyard 1 is 4 kN or less, the elongation of the shock absorber portion 30 is 1.2 m or less. When the free fall distance of the retractable lanyard 1 is 4.0 m or less and the impact load of the retractable lanyard 1 is 6 kN or less, the elongation of the shock absorber portion 30 is 1.75 m or less.

The shock absorber section 30 is a part that absorbs the impact on the wearer M that occurs when the wearer M is prevented from falling. For example, the shock absorber section 30 may be made of a relatively soft material as a whole, and may have flexibility to the extent that the wearer M does not feel uncomfortable even when the shock absorber section 30 comes into contact with the wearer M. The shock absorber portion 30 includes a belt 31, a first end portion 33 located on one side in the length direction D1 of the belt 31 (the winder 20 side), and a first end portion 33 located on the other side in the length direction D1 of the belt 31 (hook 40). a second end portion 34 located at a side), and a housing portion 32 that accommodates the belt 31, the first end portion 33, and the second end portion 34. For example, the belt 31 is made of a material that does not break when a tensile load of 15 kN is applied to it in a tensile test specified in JIS T8165 (fall arresting equipment). Therefore, the shock absorber section 30 has a strength of 15 kN or more, and does not lose its ability to absorb shock even when a tensile load of 15 kN is applied.

The accommodating portion 32 is made of cloth, for example, and is made of a deformable material. The first end portion 33 has a first opening 33b at one end in the length direction D1, through which the strap 21 is passed. The first end 33 has a cylindrical shape that widens as it moves away from the first opening 33b, and the folded belt 31 is held in a second opening 33c that widens on the opposite side of the first opening 33b. The second end 34 includes, for example, a first opening 34b and a second opening 34c that are similar to the first opening 33b and the second opening 33c, and has a similar shape to the first end 33. The strap 21 extends to the opposite side of the winder 20 (the hook 40 side) through the first opening 33b of the first end 33 and the first opening 34b of the second end 34. The tip end is connected to a main body portion 41 of the hook 40, which will be described later. The first end 33 and the second end 34 may be, for example, rubber covers, or may be made of plastic, polyethylene, vinyl resin, or a mixture thereof. In this way, the materials of the first end 33 and the second end 34 can be changed as appropriate. Note that the first end 33 and the second end 34 can also be omitted.

FIG. 3 is a perspective view showing the belt 31 folded inside the storage part 32. FIG. 4 is a diagram schematically showing an aspect of the belt 31 being folded. A strap 21 is connected to the belt 31, and the strap 21 is folded together with the belt 31. The shock absorber section 30 includes a pair of belts 31, and the pair of belts 31 are overlapped in the thickness direction D2 of the shock absorber section 30, for example.

For example, in the shock absorber section 30, seven or less belts 31 are stacked along the thickness direction D2, but the number of belts 31 is six or less, five or less, or four or less along the thickness direction D2. They may be overlapped. In the shock absorber section 30 according to the present embodiment, four belts 31 are stacked along the thickness direction D2. Each belt 31 has a first portion 31b extending at least the length L1 of the shock absorber portion 30, and a second portion 31c extending approximately half the length L1. Each belt 31 is folded 1.5 times back and forth, and sewn in between the folded portions.

When no tensile load is applied to the shock absorber section 30, the belt 31 remains folded. However, when a tensile load is applied to the shock absorber portion 30 toward both ends in the length direction D1, the seam between the folded belts 31 rips, and the belt 31 begins to stretch toward both ends in the length direction D1. . In this way, when the belt 31 stretches and the seams of the belt 31 tear, the impact energy associated with the tension is absorbed. As a result, the impact energy to the wearer M is alleviated, and the free fall distance of the retractable lanyard 1 and the impact to the wearer M can be reduced. Note that the length of the belt 31 after it begins to stretch is, for example, 0.2 m or more and 0.6 m or less, or 0.2 m or more and 1.75 m or less.

As shown in FIGS. 1 and 2, a hook 40 is provided on the opposite side of the shock absorber section 30 from the winder 20. As shown in FIGS. The hook 40 is made of aluminum, for example. However, the material of the hook 40 may also be, for example, a steel alloy. Furthermore, the material of the hook 40 may be steel, steel, iron, or carbon, and can be changed as appropriate. The weight of the hook 40 may be, for example, 0.15 kg or more and 0.4 kg or less, or 0.15 kg or more and 0.65 kg or less.

The hook 40 includes, for example, a main body portion 41 that is hooked on a structure, a grip portion 42 that closes the annular portion P formed including the main body portion 41, and a lock that maintains the closed state of the annular portion P by the grip portion 42. 43. The grip part 42 is a part that is gripped by the wearer M, and, for example, swings inward of the annular part P to open the annular part P when it is grasped by hand.

The main body portion 41 includes, for example, a tip portion 41b that is locked to the grip portion 42, a hook portion 41c extending in a C-shape from the tip portion 41b, and an end portion of the hook portion 41c opposite to the tip portion 41b. The base portion 41d extends toward the absorber portion 30. The catch portion 41c is a part that gets caught on a structure. The main body portion 41 may have a convex reinforcing portion 41f that reinforces the hooking portion 41c in the thickness direction D2.

The root portion 41d is a plate-shaped portion extending toward the shock absorber portion 30 from the hook portion 41c. The root portion 41d has a hole 41g at the end on the shock absorber portion 30 side, into which the strap 21 is inserted and fixed. A grip portion 42 and a lock portion 43 are each swingably fixed to a portion of the root portion 41d closer to the hook portion 41c than the hole portion 41g.

The grip portion 42 may have a plurality of microprotrusions 42c at a portion that receives an inward force of the annular portion P. In this case, when the grip part 42 is grasped by the hand, the minute protrusions 42c can make it difficult for the hand etc. to slip from the grip part 42. As an example, the plurality of microprotrusions 42c are arranged in a staggered manner, but the manner in which the microprotrusions 42c are arranged can be changed as appropriate. The grip portion 42 extends from the root portion 41d of the main body portion 41 toward the tip portion 41b. The grip part 42 forms the above-mentioned annular part P together with the main body part 41, and the hook 40 is fixed to the structure by forming the annular part P with a part of the structure inserted inside the hook part 41c. be done.

The grip portion 42 extends linearly from the base portion 41d toward the tip portion 41b, and a recess 42b into which the tip portion 41b fits is provided at the tip of the grip portion 42. For example, the recess 42b faces the outside of the annular portion P, and the grip portion 42 is always urged toward the outside of the annular portion P. Thereby, the grip portion 42 is always biased in the direction in which the recess 42b pushes the tip end 41b that has entered the recess 42b. Therefore, it becomes possible to maintain the locking function of the hook 40 reliably and firmly.

The lock portion 43 is provided on the opposite side of the grip portion 42 when viewed from the base portion 41d, and has a swing fulcrum on the hook portion 41c side. The locking part 43 locks the swinging of the grip part 42 when it swings in a direction away from the base part 41d, and allows the grip part 42 to swing when it swings in a direction approaching the base part 41d. . Therefore, when the grip part 42 is pushed inside the annular part P with the lock part 43 swinging in the direction approaching the root part 41d, the annular part P is released and a part of the structure is caught in the hook part 41c. It is possible to get into it. Then, when the force on the grip part 42 is released and the lock part 43 swings in a direction away from the root part 41d with a part of the structure inserted into the hook part 41c, the structure is inserted into the annular part P. The lock part 43 locks the grip part 42 in a state where a part of the grip part 42 is inserted. Therefore, a situation in which a part of the structure comes off from the annular portion P is prevented.

Next, examples of the lengths of the connector 10, the winder 20, the shock absorber section 30, and the hook 40 will be described with reference to FIG. 5. In the following, when the connector 10, the winder 20, the shock absorber section 30, and the hook 40 are arranged along the length direction D1 (when no tensile load is applied and the strap 21 does not extend from the winder 20), ) The length L1 of the shock absorber portion 30 with respect to the total length L of the retractable lanyard 1 will be explained. In the present disclosure, the "length of the shock absorber section" refers to the length of the belt in the folded state inside the shock absorber section (for example, the length of the belt 31 in the length direction D1 in the folded state). It shows the length.

The total length L of the retractable lanyard 1 used in conjunction with a full harness is determined based on the distance from the wearer's back to the front chest, and there are restrictions such as if the total length L is too long, it may get in the way during work. Designed with consideration. Therefore, the value of the total length L is expected to fall within a predetermined range. When the length L1 of the shock absorber part is relatively short with respect to the overall length L, parts other than the shock absorber part, such as the hook and the winder, become relatively long. In this case, when the retractable lanyard is worn, the relevant part may come into contact with the wearer's body, giving the wearer a sense of discomfort and possibly impairing the fit.

The ratio of the length L1 of the shock absorber portion 30 to the total length L of the retractable lanyard 1 is 30% or more. The lower limit of the ratio of length L1 to total length L may be 40%, 45% or 50%. Further, the ratio of the length L1 to the total length L may be 60% or less. In this case, the lengths of the connector 10, the winder 20, and the hook 40 can be secured more reliably. The upper limit of the ratio of length L1 to total length L may be 55% or 50%.

The length L1 of the shock absorber portion 30 is, for example, 18 cm or more. Moreover, the length L1 may be 20 cm or more, 22 cm or more, or 25 cm or more. The upper limit of the length L1 is, for example, 50 cm. However, the upper limit of the length L1 may be 45 cm, 40 cm, or 35 cm. The total length L of the retractable lanyard 1 is, for example, 50 cm or more and 80 cm or less. Further, the lower limit of the total length L may be 55 cm or 60 cm, and the upper limit of the total length L may be 75 cm or 70 cm. As an example, the total length L is 63 cm.

Next, examples of the thickness of the shock absorber section 30 and the hook 40 will be described with reference to FIG. 6. Below, the thickness T1 of the shock absorber portion 30 in the thickness direction D2 and the thickness T2 of the main body portion 41 (root portion 41d) of the hook 40 in the thickness direction D2 will be described. In the present disclosure, the "thickness of the shock absorber section" refers to the thickness of the belt in the folded state inside the shock absorber section (for example, the thickness of the belt 31 in the thickness direction D2 in the folded state). (or the thickness in the thickness direction D2 of the accommodating portion 32 that accommodates the folded belt 31).

The thickness T1 of the shock absorber portion 30 is, for example, 50 mm or less or 35 mm or less. Thickness T1 may be 30 mm or less, or 25 mm or less. As an example, the thickness T1 is 24 mm. The thickness T2 of the hook 40 is, for example, 2.5 mm or more, 3 mm or more, or 3.5 mm or more. Further, the thickness T2 may be 5 mm or more, or 6 mm or more. The magnification of the thickness T1 of the shock absorber portion 30 with respect to the thickness T2 of the hook 40 is, for example, 10 times or less, 8 times or less, or 6 times or less.

Moreover, the magnification of the thickness T1 with respect to the thickness T2 may be 8 times or less, 6 times or less, 5 times or less, or 4 times or less. The magnification of the thickness T1 with respect to the thickness T2 may be 1 times or more, 2 times or more, or 3 times or more. In other words, the lower limit of the ratio of the thickness T2 of the hook 40 to the thickness T1 of the shock absorber portion 30 may be 10%, 12.5%, 16.7%, 20% or 25%. Further, the upper limit of the ratio of the thickness T2 to the thickness T1 may be 100%, 50%, or 33.3%.

Next, the effects of the retractable lanyard 1 according to this embodiment will be explained.

In the retractable lanyard 1, the ratio of the length L1 of the shock absorber portion 30 to the total length L of the retractable lanyard 1 is 30% or more. Therefore, as shown in FIG. 1, the shock absorber part 30 having a length L1 of 30% or more can be made to follow the body of the wearer M and fit along the body of the wearer M. , it is possible to reduce the discomfort when worn and improve the fit.

Further, in the retractable lanyard 1, the hook 40 that is attached to a structure, the shock absorber section 30, the retractor 20, and the connector 10 that is attached to the wearer M are arranged in this order. There is. Therefore, when the retractable lanyard 1 is worn so that the connector 10 is positioned on the back M2 of the wearer M wearing a full harness as shown in FIG. 1, the retractor 20 adjacent to the connector 10 also The shock absorber portion 30 is located on the back M2 of the wearer M, the shock absorber portion 30 is located around the waist M6 of the wearer M, and the hook 40 is attached to a structure.

Therefore, the shock absorber part 30 can be fitted around the waist M6 of the wearer M, and the connector 10, the winder 20, and the hook 40 can be prevented from coming into contact with the vicinity of the head M3 of the wearer M. Can be done. As a result, it is possible to improve the fit and improve safety. Further, even if the hook 40 is attached in front of the shoulder M1 of the wearer M, the connector 10 and the winder 20 are provided at a position facing the back M2 of the wearer M, so that the wearer It is possible to avoid contact of the connector 10, the winder 20, and the hook 40 with the vicinity of the head M3 of the M.

Further, in the retractable lanyard 1, the connector 10, the retractor 20, the shock absorber section 30, and the hook 40 are arranged in this order. By the way, a roll-up type lanyard is known in which a connector attached to a wearer, a shock absorber part, a winder, and a hook are arranged in this order. However, in this retractable lanyard, the connector, shock absorber part, and retractor are arranged so as to surround the wearer's body, and a strap is placed between the retractor and the hook to keep the hook out of the way. It was necessary to secure a long area for the area to extend. Therefore, there is a problem in that the overall length of the retractable lanyard becomes long.

In contrast, in the retractable lanyard 1 according to the present embodiment, the connector 10, retractor 20, shock absorber section 30, and hook 40 are arranged in this order. Therefore, there is no need to secure a long area between the shock absorber section 30 and the hook 40 for the strap to extend. Therefore, the overall length L of the retractable lanyard 1 can be shortened, and the length L1 of the shock absorber section 30 can be relatively increased.

The hook 40 includes a main body part 41 that is hooked on a structure, and the thickness T1 of the shock absorber part 30 may be 10 times or less the thickness T2 of the main body part 41. In this case, by suppressing the thickness T1 of the shock absorber section 30 to 10 times or less of the main body section 41 of the hook 40, the step between the shock absorber section 30 and the main body section 41 of the hook 40 can be reduced. Therefore, the followability of the shock absorber section 30 and the hook 40 to the body of the wearer M can be improved, so that the fit of the wearer M can be improved.

The retractable lanyard 1 may have a total weight of 1 kg or less. In this case, since the retractable lanyard 1 weighs 1 kg or less, the retractable lanyard 1 can be easily worn, and the sense of discomfort when worn can be further reduced.

The length L1 of the shock absorber portion 30 may be 18 cm or more. In this case, since the length L1 of the shock absorber part 30 is 18 cm or more, the followability of the shock absorber part 30 to the body of the wearer M can be improved. Therefore, it is possible to further reduce the discomfort and improve the fit.

The hook 40 includes a main body 41 that is hooked onto a structure, and the main body 41 may have a strength of 11.5 kN or more. In this case, the strength of the hook 40 can be increased while improving the fit when worn.

The thickness T1 of the shock absorber portion 30 may be 35 mm or less, and the thickness T2 of the hook 40 may be 6 mm or more. In this case, since the difference in level between the shock absorber section 30 and the hook 40 can be reduced, the fit for the wearer M can be further improved.

In the shock absorber section 30, seven or less (for example, four) belts 31 may be stacked along the thickness direction D2. In this case, since the thickness T1 of the shock absorber portion 30 can be made thinner, the above-mentioned level difference can be further suppressed.

The embodiments of the retractable lanyard according to the present disclosure have been described above. However, the present invention is not limited to the embodiments described above. The present invention can be modified in various ways without departing from the gist of the claims. That is, the shape, size, number, material, and arrangement of each part of the retractable lanyard can be changed as appropriate without changing the gist of the invention.

1... Retractable lanyard, 10... Connector, 20... Winder, 21... Strap, 30... Shock absorber section, 40... Hook, 41... Main body section, L... Overall length, L1... Length, T1, T2... Thickness S-M...wearer.

Claims (17)

A retractable lanyard that prevents a wearer wearing a full harness from falling from a structure,
a hook attached to the structure;
a shock absorber section that absorbs a shock applied to the wearer;
a winder that winds up a strap extending from the shock absorber section;
a connector attached to the wearer;
in this order,
the shock absorber portion is located around the waist of the wearer when the connector is located on the back of the wearer and the hook is located in front of the shoulder of the wearer;
Retractable lanyard. The hook includes a main body that is hooked to the structure,
The thickness of the shock absorber part is 10 times or less than the thickness of the main body part,
The retractable lanyard according to claim 1. The total weight is 1 kg or less,
The retractable lanyard according to claim 1 or 2. The length of the shock absorber portion is 18 cm or more,
The retractable lanyard according to any one of claims 1 to 3. The hook includes a main body that is hooked to the structure,
The main body has a strength of 11.5 kN or more,
The retractable lanyard according to any one of claims 1 to 4. The retractable lanyard according to any one of claims 1 to 5, which has a total length of 50 cm or more and 80 cm or less when unstretched. The retractable lanyard according to any one of claims 1 to 6, having a total length after elongation of less than 1.75 m. The retractable lanyard according to any one of claims 1 to 7, wherein the shock absorber portion has a thickness of 50 mm or less. The shock absorber section is
belt and
a first end located on one side of the belt in the longitudinal direction;
a second end located on the other side of the belt in the longitudinal direction;
an accommodating part that accommodates the belt, the first end, and the second end;
The retractable lanyard according to any one of claims 1 to 8, comprising: The roll-up lanyard according to claim 9, wherein the housing portion is made of cloth. The winding according to claim 9 or 10, wherein when no tensile load is applied to the shock absorber part, the belt is folded inside the housing part in such a manner that they overlap in the thickness direction of the shock absorber part. Removable lanyard. The retractable lanyard according to claim 11, wherein the belt is overlapped seven times or less in the thickness direction. Any one of claims 9 to 12, wherein when a tensile load is applied to the shock absorber portion on both sides in the length direction, the belt is unfolded and the belt extends on both sides in the length direction. Retractable lanyard as described in section. The winder is
A strap wound around a coil member provided inside the housing part;
a rotating shaft and a rotating blade;
a connection part to which the connector is connected;
has
While the strap is extended, the rotating vane rotates around the rotation axis and is caught radially outward by centrifugal force, thereby locking the strap when a tensile load is applied. 14. The retractable lanyard according to any one of Item 13. The hook is
A main body that can be hung on a structure,
a grip portion that closes an annular portion formed including the main body portion;
a lock portion that maintains the annular portion in a closed state by the grip portion;
The retractable lanyard according to any one of claims 1 to 14, comprising: The main body portion has a tip portion that is engaged with the grip portion, the grip portion extends linearly from the base portion toward the tip portion, and the tip portion is attached to the tip portion of the grip portion. 16. The roll-up lanyard according to claim 15, further comprising a recess into which the lanyard enters . The retractable lanyard according to any one of claims 1 to 16, wherein the ratio of the length of the shock absorber portion to the total length of the retractable lanyard is 30% or more.

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