JP7659311B2 - Fall arrest harness - Google Patents

Description

The present invention relates to a fall prevention harness that is worn by workers when working at height to prevent them from falling.

When working at high altitudes, workers are required to wear fall protection equipment to prevent themselves from falling if they should happen to fall. Of these, harness-type fall protection equipment mainly consists of a harness and a lanyard. Workers attach a hook or similar device on one end of the lanyard to a lifeline or solid structure, and connect the other end to the harness worn around their body to prevent them from falling if they lose their footing, etc.

A D-ring for connecting the lanyard is attached to the connection point of the harness with the lanyard. This D-ring is generally located at the intersection of the shoulder belts on the back. Depending on the purpose of use, some harnesses have D-rings on the chest as well as the back. Hereinafter, the D-ring on the chest will be referred to as the "chest D-ring".

Harnesses with various belt shapes have been developed. In terms of the belt shape from the shoulders to the chest as viewed from the front of the worker wearing the harness, there are known harnesses with an H-shaped belt configuration at the chest part of the harness as shown in Figure 8 (hereafter referred to as "chest H-type") and an X-shaped belt configuration at the chest part of the harness as shown in Figure 9 (hereafter referred to as "chest X-type") (see, for example, Patent Documents 1 to 4). There are also chest Y-shaped harnesses.

The H-shaped chest harness 100 shown in Figure 8 has a structure in which a pair of shoulder belts 102 extending downward in an almost vertical direction are connected at the chest position by a chest belt 104. In the case of this H-shaped chest harness 100, a chest D-ring 106 is provided in the center of the chest belt 104 that runs horizontally at the chest position. By disconnecting the chest belt 104, the center of the chest is opened, making it easy to put on and take off the harness. With this structure, it was necessary to firmly fix the intersection 108 of the shoulder belts 102 and chest belt 104 located on the left and right in order to provide strength to the attachment points of the chest D-rings.

9 shows a chest X-type harness 110 in which a pair of shoulder belts 112 extend diagonally downward toward the center of the chest and cross at the center of the chest. In the case of this chest X-type harness 110, a chest D-ring 114 is provided at the center of the X. Because of the chest crossing structure and measures taken to prevent the chest D-ring 114 from sliding out of the belt, there is no risk of the belt being pulled upward in the event of a fall, causing problems such as the belt tightening around the neck.
Although not shown in the figure, the chest Y-type harness has a pair of shoulder belts that extend diagonally downward toward the center of the chest and overlap at the center of the chest. This chest Y-type harness also requires measures similar to those for the chest X-type harness.

JP 2020-28386 A JP 2020-28404 A JP 2013-27523 A JP 2020-110275 A

If the hook of the lanyard is connected to the chest D-ring 106 of the chest H-shaped harness 100, the chest belt 104 is pulled upward in the event of a fall. If the harness is worn with the thigh belts etc. not properly adjusted in length and loose, this action can cause the belt to slip up and put pressure on the body, the chest belt can put pressure on the throat, or the belt or chest D-ring 106 can cause a blow to the face. Also, in order to give strength to the left and right belt intersections 108, there are cases where the number of stitching points and parts is increased.
In addition, due to its structure, the chest X-shaped harness 110 cannot be worn by opening the center of the chest, and it is necessary to either undo the buckles on the left and right sides or to wear it by pulling it over one's head. Also, in order to prevent the chest D-ring 114 from sliding, the number of sewing points and parts increases, and the number of work steps during harness assembly increases, leading to increased costs.
SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a fall arrest harness which combines the advantages of both an H-type chest harness and an X-type chest harness.

The fall prevention harness of the present invention comprises a pair of shoulder belts, a pair of side belts or a pair of thigh belts and a chest belt, and a pair of connecting fittings, each of the pair of connecting fittings is provided with a connecting ring attachment hole through which a connecting ring is passed, the shoulder belts and the side belts or the thigh belt and the chest belt are each connected to the connecting fittings, and has a connecting ring attachment structure in which the connecting ring is connected to the pair of connecting fittings by inserting the connecting ring into each of the connecting ring attachment holes of the pair of connecting fittings.

In the fall arrest harness of the present invention, it is preferable that the connecting ring is a ring having an opening and closing portion, and that the ring is configured to be detachable from the pair of connecting fittings.
In the fall arrest harness of the present invention, the connecting fittings are provided with a shoulder belt insertion hole at an upper position through which the shoulder belt is passed, a side belt insertion hole at a lower position through which the side belt is passed, and a chest belt insertion hole at a central position through which the chest belt is passed, and it is preferable that the shoulder belt, the side belt and the chest belt are each connected to the connecting fittings by inserting the shoulder belt into the shoulder belt insertion hole, the side belt into the side belt insertion hole and the chest belt into the chest belt insertion hole.

In the fall prevention harness of the present invention, the connecting metal fitting is composed of a belt hole forming area in which the shoulder belt insertion hole, the side belt insertion hole, and the chest belt insertion hole are respectively provided, and a connecting hole forming area formed extending from the edge of the central position of the belt hole forming area and in which the connecting ring attachment hole is provided, the chest belt insertion hole is composed of a plurality of vertically elongated holes, each of which is arranged horizontally at intervals, the shoulder belt insertion hole is formed as an elongated hole, the shoulder belt insertion hole is arranged at an incline with respect to the horizontal direction so that the end far from the connecting ring attachment hole is located downward and the end close to the connecting ring attachment hole is located upward, and the side belt insertion hole is formed as an elongated hole, the side belt insertion hole is arranged at an incline with respect to the horizontal direction so that the end far from the connecting ring attachment hole is located upward and the end close to the connecting ring attachment hole is located downward.

In the fall prevention harness of the present invention, it is preferable that the connecting hole formation region is formed so as to rise on the surface side in the plate thickness direction of the connecting fitting.
In the fall arrest harness of the present invention, the chest belt is provided with a connecting device having a first end and a second end that can be connected and disconnected, a first connecting belt portion connected to one connecting fitting, and a second connecting belt portion connected to the other connecting fitting, and it is preferable that the first end is connected to the first connecting belt portion and the second end is connected to the second connecting belt portion.

The fall arrest harness according to the present invention comprises a pair of shoulder belts, a pair of side belts or thigh belts and chest belt, and a pair of connecting fittings, and the shoulder belts, side belts or thigh belts and chest belt are each connected to the connecting fittings. The pair of connecting fittings are each provided with a connecting ring attachment hole through which a connecting ring passes, and have a connecting ring attachment structure in which the connecting ring is connected to the pair of connecting fittings by inserting the connecting ring into each of the connecting ring attachment holes of the pair of connecting fittings. There is no need to firmly fix the belt intersection as in a chest H-type harness, and no need for measures to prevent the chest D-ring from sliding as in a chest X-type harness, so the structure is simple and the number of sewing points and parts can be reduced. With the above structure, it is possible to provide a harness that combines the advantages of both the chest H-type and chest X-type harnesses.

1 is a diagram showing the fall prevention harness of this embodiment in a state where the connection is released at the center of the chest. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 13 is a diagram showing a state in which the belts are connected via connecting fittings. FIG. 5 is a view taken along the arrow B in FIG. 4 . 13A and 13B are diagrams showing a connecting ring attachment structure in which a connecting ring is connected to a pair of connecting fittings. FIG. 7 is a view taken along the arrow C in FIG. 6 . FIG. 13 is a diagram showing a chest H-harness. FIG. 1 shows a chest X-harness.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a state in which the fall prevention harness of this embodiment is released at the center of the chest.
As shown in Fig. 1, the fall arrest harness 10 of this embodiment includes a pair of shoulder belts 12, a pair of side belts 14, a pair of thigh belts 16, a chest belt 18, a connecting metal fitting 20, a waist metal fitting 22, a hip support belt 24, a fixing plate 26, and a back D-ring 28. In the harness shown in Fig. 1, the chest belt 18 is disconnected, and the chest D-ring is not connected.
In this embodiment, the chest side when the harness is worn may be referred to as the front side, and the back side may be referred to as the rear side.

Each shoulder belt 12 is folded back upward. This folding forms a front shoulder belt portion 12a and a rear shoulder belt portion 12b in the shoulder belt 12. The front shoulder belt portion 12a extends downward on the front side and is connected to a connecting metal fitting 20 near the chest area. The rear shoulder belt portions 12b cross each other on the back side to form an intersection portion 30. The rear shoulder belt portions 12b with the intersection portion 30 formed therein are connected to a waist metal fitting 22 near the waist area.
One end of the side belt 14 is connected to a connecting metal fitting 20 and extends downward, and the other end is connected to a waist metal fitting 22 around the waist.

The chest belt 18 includes a first chest belt portion 18a as a first connecting belt portion, a second chest belt portion 18b as a second connecting belt portion, and a buckle 18c as a connecting device. The first chest belt portion 18a is connected to one connecting metal fitting 20. The second chest belt portion 18b is connected to the other connecting metal fitting 20. The buckle 18c includes a buckle body 18d as a first end portion and a tongue plate 18e as a second end portion. In the chest belt 18, the buckle body 18d is connected to the end portion of the first chest belt portion 18a. The tongue plate 18e is connected to the end portion of the second chest belt portion 18b. The tongue plate 18e is inserted into the buckle body 18d to connect the two, and the tongue plate 18e is pulled out of the buckle body 18d to enable disconnection. The buckle 18c enables the first chest belt portion 18a and the second chest belt portion 18b to be connected and disconnected.

FIG. 2 is a plan view of the connecting fitting, and FIG. 3 is a cross-sectional view taken along line AA of FIG.
2 and 3, the connecting fitting 20 is formed of a plate-shaped member. It is preferable to use a metal material such as high carbon steel such as S50C or alloy steel such as chrome molybdenum steel as the material for the connecting fitting 20. The connecting fitting 20 is composed of a belt hole forming region 32 and a connecting hole forming region 34.
The connecting hole forming region 34 is provided extending from an end side at the center position of the belt hole forming region 32. A connecting ring attachment hole 36 having a diameter allowing the connecting ring to be inserted therethrough is provided in this connecting hole forming region 34. The connecting hole forming region 34 is also formed so as to rise up on the front surface side of the connecting fitting 20 in the plate thickness direction.

The belt hole forming region 32 is provided with a shoulder belt insertion hole 38 through which the shoulder belt 12 passes, a side belt insertion hole 40 through which the side belt 14 passes, and a chest belt insertion hole 42 through which the chest belt 18 passes.
The chest belt insertion hole 42 is provided at the center of the belt hole forming area 32. The chest belt insertion hole 42 is composed of a plurality of vertically elongated holes having a width that allows the chest belt 18 to pass therethrough, and the vertically elongated holes are arranged substantially parallel to each other at intervals in the horizontal direction. In this embodiment, the chest belt insertion hole 42 is composed of three vertically elongated holes.

The shoulder belt insertion hole 38 is formed as an elongated hole having a width that allows the shoulder belt 12 to be inserted therethrough. The shoulder belt insertion hole 38 is provided above the chest belt insertion hole 42. The shoulder belt insertion hole 38 is disposed at an angle with respect to the horizontal direction such that the end portion 38a farther from the connecting ring attachment hole 36 is positioned downward and the end portion 38b closer to the connecting ring attachment hole 36 is positioned upward. Specifically, the shoulder belt insertion hole 38 is preferably disposed at an angle within a range of 30° to 45° with respect to the horizontal direction.
The side belt insertion hole 40 is formed as an elongated hole having a width allowing the side belt 14 to be inserted therethrough. The side belt insertion hole 40 is provided below the chest belt insertion hole 42. The side belt insertion hole 40 is disposed at an incline with respect to the horizontal arrangement so that the end 40a farther from the connecting ring attachment hole 36 is located at the top and the end 40b closer to the connecting ring attachment hole 36 is located at the bottom. Specifically, the side belt insertion hole 40 is preferably disposed at an inclination angle within the range of -30° to -45° with respect to the horizontal direction.

FIG. 4 is a view showing a state in which the belts are connected via connecting fittings, and FIG. 5 is a view taken along the line B in FIG.
4 and 5, the shoulder belt 12 is connected to the connecting metal fitting 20 by inserting the front shoulder belt portion 12a through the shoulder belt insertion hole 38, folding it back and sewing the overlapping portion. The side belt 14 is connected to the connecting metal fitting 20 by inserting one end of the side belt 14 through the side belt insertion hole 40, folding it back and sewing the overlapping portion. The chest belt 18 is connected to the connecting metal fitting 20 by inserting the chest belt 18 through a plurality of chest belt insertion holes 42. Specifically, the first chest belt portion 18a is connected to one connecting metal fitting 20, and the second chest belt portion 18b is connected to the other connecting metal fitting 20. In this way, the shoulder belt 12, the side belt 14 and the chest belt 18 are connected to each other via the connecting metal fitting 20.
The length of the chest belt 18 can be adjusted, and when the chest D-ring is not attached, the length of the chest belt 18 can be adjusted according to the wearer's physique and preferences.

FIG. 6 is a view showing a connecting ring mounting structure in which a connecting ring is connected to a pair of connecting fittings, and FIG. 7 is a view taken along the arrow C in FIG.
As shown in FIGS. 6 and 7 , the harness 10 of this embodiment has a connecting ring attachment structure in which a chest D-ring 44 serving as a connecting ring is connected to a pair of connecting fittings 20 .
The chest D-ring 44 has a base 44a and a curved portion 44b. The base 44a extends in a substantially straight line, and an opening/closing portion 44c is provided in the center of the base 44a. The curved portion 44b extends from one end of the base 44a to the other end, curving convexly in a direction away from the base 44a. The curved portion 44b is curved in a smooth curve. In other words, the chest D-ring 44 is a ring with an opening/closing portion 44c. A ring with a carabiner structure is preferable as the ring with the opening/closing portion 44c.
The opening/closing portion 44c of the chest D-ring 44 is opened, and the base 44a and curved portion 44b are inserted from the open opening/closing portion 44c into each of the connecting ring mounting holes 36 of the pair of connecting fittings 20, and the opening/closing portion 44c is closed, thereby connecting the chest D-ring 44 to the pair of connecting fittings 20. The connecting orientation of the chest D-rings 44 to be connected is determined so that the base 44a is positioned between the connecting ring mounting holes 36 of the pair of connecting fittings 20 and the base 44a is positioned on the body side.

In this embodiment, it is preferable to use a ring having a shape of an approximately isosceles triangle with the base 44a forming the base and the curved portions 44b forming two equal sides as the chest D-ring 44. When a ring having a shape of an approximately isosceles triangle is connected to a pair of connecting fittings 20, the connecting ring attachment holes 36 are each located near the corners formed by the base and the equal sides, and the connecting ring attachment structure is arranged symmetrically, so that the chest D-ring 44 is less likely to shift even when a load is applied.
In addition, commercially available O-type or modified D-type carabiners can also be used.

1, the thigh belt 16 includes a first thigh belt portion 16a, a second thigh belt portion 16b, and a buckle 16c. One end of the first thigh belt portion 16a and one end of the second thigh belt portion 16b are each connected to a waist metal fitting 22, with the first thigh belt portion 16a extending to the front side and the second thigh belt portion 16b extending to the rear side.
The buckle 16c is composed of a buckle body 16d and a tongue plate 16e. The buckle body 16d is connected to the other end of the first thigh belt portion 16a, and the tongue plate 16e is connected to the other end of the second thigh belt portion 16b. The tongue plate 16e is inserted into the buckle body 16d to be connected, and the tongue plate 16e can be pulled out of the buckle body 16d to be disconnected. The buckle 16c allows the first thigh belt portion 16a and the second thigh belt portion 16b to be connected and disconnected.

Both ends of the hip support belt 24 are connected to the second thigh belt portions 16 b of the respective thigh belts 16 , and are configured to connect the pair of thigh belts 16 together.
The fixed plate 26 is disposed at the intersection 30. The pair of rear shoulder belts 12b are passed through the fixed plate 26 so as to cross each other. The fixed plate 26 is attached to the pair of rear shoulder belt portions 12b.
The back D-ring 28 is attached to the fixed plate 26 and the pair of rear shoulder belt portions 12b at the intersection 30. The back D-ring 28 has a base portion 28a and a curved portion 28b. The base portion 28a extends in a substantially straight line. The curved portion 28b extends from one end of the base portion 28a to the other end thereof, curved in a convex shape in a direction away from the base portion 28a. The curved portion 28b is curved in a smooth curve. The base portion 28a is attached by being sandwiched between the pair of intersecting rear shoulder belt portions 12b and the fixed plate 26.

<Effects of this embodiment>
According to this embodiment, the following effects can be obtained.
The fall prevention harness of this embodiment includes a pair of shoulder belts 12, a pair of side belts 14, a chest belt 18, and a pair of connecting metal fittings 20, and the shoulder belts 12, the side belts 14, and the chest belt 18 are connected to the connecting metal fittings 20. The pair of connecting metal fittings 20 each have a connecting ring attachment hole 36 through which a chest D ring 44 passes, and has a connecting ring attachment structure in which the chest D ring 44 is connected to the pair of connecting metal fittings 20 by inserting the chest D ring 44 into each of the connecting ring attachment holes 36 of the pair of connecting metal fittings 20. Since there is no need to firmly fix the belt intersection like in the chest H-type harness, and no need to take measures to prevent the chest D ring from sliding like in the chest X-type harness, the structure is simple, the number of sewing points and parts can be reduced, and the number of work steps during harness assembly can be reduced, reducing the burden of assembly and leading to cost reduction. With the above structure, a harness that combines the advantages of both the chest H-type and the chest X-type harnesses can be provided.

In addition, the chest D-ring 44 has a carabiner structure with an opening/closing portion 44c, and is configured to be detachable from the pair of connecting fittings 20. In this way, the chest D-ring 44 is configured to be attachable and detachable, and the harness can be used with the chest D-ring attached when it is necessary, and can be used without the chest D-ring attached when it is not necessary, so that the presence or absence of a chest D-ring can be flexibly selected depending on the type of work.
The shoulder belt insertion holes 38 are arranged at a predetermined angle with respect to the horizontal direction, and the side belt insertion holes 40 are arranged at a predetermined angle with respect to the horizontal direction on the opposite side to the shoulder belt insertion holes 38. By connecting the shoulder belt 12 to the shoulder belt insertion holes 38, the side belt 14 to the side belt insertion holes 40, and the chest belt 18 to the chest belt insertion holes 42, respectively, the chest structure of the harness 10 becomes close to that of a chest X-type harness. With this structure, even if the harness is worn in a loose state due to inappropriate length adjustment of the thigh belts, etc., the occurrence of problems such as compression of the throat or hitting of the face by the belt when falling, as occurs with a chest H-type harness, is suppressed.

The connecting hole forming region 34 is formed so as to rise on the surface side in the plate thickness direction of the connecting fittings 20. By forming this rise, the chest D-rings 44 connected to the pair of connecting fittings 20 are positioned on the front side of the wearer, so that compression of the chest side of the wearer by the connected chest D-rings 44 is suppressed.
The chest belt 18 is equipped with a buckle 18c having a buckle body 18d and a tongue plate 18e that can be connected and disconnected, and this buckle body 18d is connected to the first chest belt part 18a, and the tongue plate 18e is connected to the second chest belt part 18b. With this structure, the central part of the chest belt of the harness 10 opens by disconnecting the buckle 18c of the chest belt 18, so that the harness 10 can be easily put on like an H-shaped chest harness.

<Modification>
The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope of the present invention that can achieve the object of the present invention are included in the present invention.
In the above embodiment, the side belt 14 is provided and connected to the connecting metal fitting 20, but the present invention is not limited to this. For example, the thigh belt may be elongated to the length of the side belt, and the elongated thigh belt may be connected to the connecting metal fitting instead of the side belt.

The fall protection harness described above can be widely applied to harnesses used for work at height.

10 Fall prevention harness 12 Shoulder belt 14 Side belt 18 Chest belt 18a First chest belt portion (first connecting belt portion)
18b Second chest belt part (second connecting belt part)
18c Buckle (connector)
18d Buckle body (first end)
18e Tongue plate (second end)
20 Connection fitting 32 Belt hole forming area 34 Connection hole forming area 36 Connection ring attachment hole 38 Shoulder belt insertion hole 40 Side belt insertion hole 42 Chest belt insertion hole 44 Chest D ring (connection ring)
44c Opening and closing section

Claims (6)

A pair of shoulder belts, a pair of side belts or thigh belts and a chest belt, and a pair of connecting metal fittings are provided.
The pair of connecting fittings each have a connecting ring attachment hole through which a connecting ring is passed,
The shoulder belt and the side belt or the thigh belt and the chest belt are connected to the connecting metal fittings,
A fall prevention harness characterized in that it has a connecting ring mounting structure in which the connecting ring is connected to the pair of connecting fittings by inserting the connecting ring into each of the connecting ring mounting holes of the pair of connecting fittings. The fall prevention harness according to claim 1 , wherein the connecting ring is a ring having an opening and closing portion, and the ring is configured to be detachable from the pair of connecting fittings. The connecting metal fitting is provided with a shoulder belt insertion hole at an upper position through which the shoulder belt is passed, a side belt insertion hole at a lower position through which the side belt is passed, and a chest belt insertion hole at a central position through which the chest belt is passed,
2. The fall arrest harness according to claim 1, wherein the shoulder belt, the side belt, and the chest belt are each connected to the connecting metal fittings by inserting the shoulder belt through the shoulder belt insertion hole, the side belt through the side belt insertion hole, and the chest belt through the chest belt insertion hole. the connecting metal fitting is composed of a belt hole forming region in which the shoulder belt insertion hole, the side belt insertion hole and the chest belt insertion hole are respectively formed, and a connecting hole forming region which is formed extending from an end side at the central position of the belt hole forming region and in which the connecting ring attachment hole is formed,
The chest belt insertion hole is composed of a plurality of vertically elongated holes, each of which is arranged substantially parallel to the horizontal direction at intervals,
the shoulder belt insertion hole is formed as an elongated hole, and is disposed at an angle with respect to the horizontal direction so that an end portion farther from the connecting ring attachment hole is positioned downward and an end portion closer to the connecting ring attachment hole is positioned upward,
4. A fall prevention harness as described in claim 3, wherein the side belt insertion hole is formed as a long hole, and the side belt insertion hole is arranged at an angle to the horizontal direction so that the end farther from the connecting ring mounting hole is located upward and the end closer to the connecting ring mounting hole is located downward. The fall prevention harness according to claim 4 , wherein the connecting hole forming area is formed so as to rise up on a surface side in a plate thickness direction of the connecting fitting. The chest belt includes a connecting device having a first end and a second end that can be connected and disconnected, a first connecting belt part connected to one of the connecting fittings, and a second connecting belt part connected to the other connecting fitting,
The fall protection harness of claim 1 , wherein the first end is connected to the first connecting belt portion and the second end is connected to the second connecting belt portion.

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