Safety belt attachment

Abstract

To provide a safety belt fixture capable of preventing horizontal sliding and accompanying downward sliding.SOLUTION: A safety belt fixture 10 comprises: an attachment part 12 that is detachably attached to a scaffold constituent; and an annular part 14 to which a hook of a safety belt can be locked. The attachment part 12 is attached with a shaft 58 to be freely opened / closed, and a horizontal slide preventing claw 16 is provided on at least the lower side of the shaft 58.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a safety belt fastener for fastening a hook of a safety belt which is attached to a vertical member of scaffolding set up at a construction site or the like. [Background technology]

[0002] At construction sites, it is common to set up scaffolding made of materials such as single-tube pipes on the outside of exterior walls. On scaffolding equipped with handrails, workers can work safely by hooking the hook connected to the end of the rope of their safety belt to the handrail. On the other hand, to work on a scaffold that does not have handrails installed, the hook is attached to either an overhead horizontal member or a vertical member on that level. When the hook is attached to an overhead cross member, it is attached at a higher position than normal, so there is no slack in the safety belt rope, and the worker's range of movement, i.e., working range, is significantly limited.

[0003] When a hook is fastened to a vertical member, unless there is a protrusion that crosses the vertical member, the hook will fall to the intersection with the horizontal member below. If the hook falls to the horizontal member at the foot of the story, the falling distance in the event of a fall will be long, which is very dangerous. In addition, since a horizontal member intersects the middle part of the vertical member, even if the hook can be engaged at that intersection, the engaged hook will be in a horizontal position, so in the event of a fall a lateral bending load will be applied to the hook's hook, which may break and come off.

[0004] In order to eliminate the problems that arise when hooks are directly engaged with the horizontal and vertical members as described above, a clamp as shown in FIG. 20 is currently used (for example, Patent Document 1). This clamp 110 has a pair of engagement pieces 111, 112 that can be fitted onto the vertical member 102 and are hinged so as to be able to open and close freely, a bolt 113 having a nut 115 screwed into it is connected to the end of one of the engagement pieces 111, and a recessed groove 114 is formed in the end of the other engagement piece 112. In addition, a ring portion 116 is provided on the engagement piece 111. The clamp 110 can be attached to any location on the vertical member 102 by sandwiching the vertical member 102 between the engagement pieces 111, 112, fitting the bolt 113 into the recessed groove 114, and tightening the ends of the engagement pieces 111, 112 with a nut 115. The hook 104 is engaged with the annular portion 116 to prevent the above-mentioned problems from occurring. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2000-310040 A Summary of the Invention [Problem to be solved by the invention]

[0006] If the direction of the annular portion 116 when the clamp 110 described above is attached to the vertical member 102 is set to the front (0 degrees), the worker may often perform work in a position that exceeds 45 degrees to the left or right from the front. That is, this is the case when the clamp 110 is used in a working range close to sideways with respect to the annular portion 116. If a worker falls from such a working position, the clamp 110 is subjected to a large load not only in the downward direction but also in the lateral direction. When a lateral load greater than the static friction force generated between the clamp 110 and the vertical member 102 is applied to the clamp 110, the clamp 110 starts to move with the vertical member 102 as its axis. Since the friction force after the clamp 110 starts to move becomes a kinetic friction force with a kinetic friction coefficient smaller than the static friction coefficient, the clamp 110, to which a lateral load greater than the kinetic friction force is applied, continues to rotate around the vertical member 102. That is, the clamp 110 slides sideways. In such a case, it was found that not only does the clamp 110 slide sideways due to a lateral load greater than the kinetic friction force, but the clamp 110 may also slide downward due to a downward load greater than the kinetic friction force, and may slide down while rotating around the vertical member 102 as its axis.

[0007] Since the magnitude of the static friction force generated between the clamp 110 and the vertical member 102 varies depending on the degree of tightening during installation, problems are unlikely to occur if the clamp is tightened so tightly that the static friction force is greater than the lateral load. However, since workers install the clamps each time depending on the work location, it is possible that the tightening is done manually. In this case, the tightening may be loose, for example, with a tightening torque of less than 10 N m, and it was necessary to address this issue. SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a safety belt attachment which is capable of preventing lateral slippage and the associated downward slippage. [Means for solving the problem]

[0008] The safety belt attachment device of the present invention is a safety belt attachment device comprising an attachment part which can be attached detachably to a scaffolding component and a ring part to which a hook of a safety belt can be engaged, the attachment part being attached to an axis so as to be freely opened and closed, and an anti-slip claw being provided on at least the lower side of the axis. In the safety belt mounting device of the present invention, it is preferable that the anti-slip claw is formed in at least an arc shape on the side of the retaining space of the scaffolding component that is formed when the mounting part is in a closed state, and that a sawtooth-shaped pressing portion is formed on the arc side. In the safety belt mounting device of the present invention, it is preferable that the anti-slip claw is attached so as to be freely rotatable about the axis, and that when the anti-slip claw rotates, the pressing portion presses the scaffolding component held in the holding space.

[0009] In the safety belt fastening device of the present invention, it is preferable that the anti-slip claws are provided above and below the shaft. The safety belt attachment device of the present invention preferably further comprises a rotation limiting member for limiting rotation of the skid prevention claw when the attachment part is in a closed state. In the safety belt mounting device of the present invention, it is preferable that the anti-slip claw has a concave portion and the rotation limiting member has a convex portion, and that the convex portion is maintained fitted into the concave portion to limit the rotation of the anti-slip claw when the mounting part is in a closed state.

[0010] In the safety belt mounting device of the present invention, it is preferable that the rotation limiting member is configured so that the convex portion breaks when a load equal to or greater than a predetermined value is applied, thereby releasing the restriction on the rotation of the skid prevention claw. In the safety belt attachment device of the present invention, it is preferable that the rotation limiting member is attached to the shaft and is configured to be detachable from the shaft. In the safety belt mounting device of the present invention, it is preferable that the annular portion is pivotally attached by the shaft, and a standing portion is provided in an area located opposite the arc side of the anti-slip claw, and that the standing portion is configured to transmit the load associated with the rotation of the annular portion to the anti-slip claw. Effect of the Invention

[0011] In the safety belt attachment device according to the present invention, the anti-slip claw is provided at least on the lower side of the shaft. Therefore, even if a large lateral load is applied due to a fall, the anti-slip claw bites into the side of the scaffolding component to suppress its movement, preventing the safety belt attachment device from slipping sideways. In addition, when the safety belt attachment device falls, it is pulled downward starting from the loop, but since the anti-slip claw attached to the lower side of the shaft bites into and grips the side of the scaffolding component, downward slippage can also be prevented even if the attachment is not tightened loosely. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a perspective view of the safety belt attachment device of the present embodiment. [Diagram 2] FIG. 2 is a plan view of FIG. [Diagram 3] FIG. 2 is a front view of FIG. [Figure 4] FIG. [Diagram 5] FIG. 5 is a plan view of FIG. [Figure 6] FIG. 5 is a front view of FIG. [Figure 7] FIG. [Figure 8] FIG. 8 is a plan view of FIG. [Figure 9] FIG. 8 is a rear view of FIG. [Figure 10] 13 is a diagram showing a state in which the first engagement piece and the second engagement piece are arranged in an opposing relationship. FIG. [Figure 11] 13 is a diagram showing a state in which a nut is screwed onto a threaded portion of a connecting member. FIG. [Figure 12] FIG. 13 is a diagram showing a state in which the engagement pieces are connected. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. 15 is a plan view of FIG. [Figure 16] FIG. [Figure 17] FIG. 17 is a front view of FIG. 16. [Figure 18] FIG. 2 is a plan view of the safety belt attachment device when the attachment part is in an open state. [Figure 19] FIG. 2 is a diagram showing the state in which the safety belt attachment device of the present embodiment is attached to a vertical member. [Figure 20] FIG. 1 illustrates a conventional clamp. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a safety belt attachment device of this embodiment, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof. As shown in FIGS. 1 to 3, a safety belt attachment device 10 of this embodiment includes an attachment portion 12, a ring-shaped portion 14, and a skid prevention claw 16. As shown in FIG.

[0014] <Mounting section configuration> The attachment portion 12 is a member for removably attaching the safety belt attachment device 10 to a scaffolding component. The mounting portion 12 has a pair of opposing arc-shaped first and second engagement pieces 18 and 20 . Fig. 4 is a perspective view of the first engagement piece, Fig. 5 is a plan view thereof, and Fig. 6 is a front view thereof. Fig. 7 is a perspective view of the second engagement piece, Fig. 8 is a plan view thereof, and Fig. 9 is a rear view thereof. Fig. 10 is a view showing a state in which the first engagement piece and the second engagement piece are disposed in an opposing relationship. 4 to 6, the first engagement piece 18 is composed of a first shaft portion 22, a first arcuate portion 24, and a first connecting portion 26. The first shaft portion 22 is provided on one end side of the first arcuate portion 24, and the first connecting portion 26 is provided on the other end side.

[0015] 7 to 9, the second engagement piece 20 is composed of a second shaft portion 28, a second arc portion 30, and a second connecting portion 32. The second shaft portion 28 is provided on one end side of the second arc portion 30, and the second connecting portion 32 is provided on the other end side. 10, by arranging the first engaging piece 18 and the second engaging piece 20 in an opposing state, a cylindrical internal space 34 is formed by the arcuate portions 24, 30 of both engaging pieces 18, 20. This internal space 34 becomes a holding space 36 for the scaffolding constituent members. Grooves 38, 40 are formed on the internal space 34 side near the boundary between the axial portion of the arcuate portion of the first engagement piece 18 and the second engagement piece 20, respectively, into which a rotation limiting member, described later, is clamped when the mounting portion 12 is in the closed state.

[0016] 4 to 6, in this embodiment, the first shaft portion 22 of the first engagement piece 18 is formed in a substantially U-shape, and both ends are provided with shaft holes 42. The first connecting portion 26 of the first engagement piece 18 is formed in a substantially U-shape, and both ends are provided with connection holes 44 for connecting to a connecting member. 7 to 9, the second shaft portion 28 of the second engagement piece 20 is formed in a substantially U-shape, and is provided at both ends with shaft holes 46. The second connecting portion 32 of the second engagement piece 20 is provided with a bifurcated portion 48 having an opening formed in a substantially U-shape. In this embodiment, the U-shaped spacing of the first shaft portion 22 of the first engagement piece 18 is formed wider by the upper and lower thicknesses than the U-shaped spacing of the second shaft portion 28 of the second engagement piece 20. In other words, when both engagement pieces 18, 20 are overlapped at the shaft portions, the first shaft portion 22 of the first engagement piece 18 is disposed on the outside, and the second shaft portion 28 of the second engagement piece 20 is disposed on the inside. FIG. 11 is a view showing a state in which the nut is screwed onto the threaded portion of the connecting member. As shown in Fig. 11, the connecting member 50 is formed of a generally rod-shaped body, and a connection hole 52 for connecting to the first engagement piece 18 is provided at its base end. A threaded portion 54 is provided at its tip. The threaded portion 54 has a thread groove, and a nut 56 is screwed into it. It is preferable that the threaded portion 54 is treated to prevent the nut 56 from falling off. Examples of the treatment to prevent the nut 56 from falling off include crimping the tip of the threaded portion 54, fixing a locking washer to the tip of the threaded portion 54, or providing a horizontal hole at the tip of the threaded portion 54 and attaching a locking snap pin thereto.

[0017] <Connection of engagement pieces> FIG. 12 is a view showing a state in which the engagement pieces are connected. 12, the first engagement piece 18 and the second engagement piece 20 are disposed facing each other to form a cylindrical internal space 34, and the first engagement piece 18 and the second engagement piece 20 are connected by overlapping the axial hole 42 of the first engagement piece 18 and the axial hole 46 of the second engagement piece 20 and inserting an axis 58 therethrough. The connection hole 44 of the first engagement piece 18 and the connection hole 52 of the connecting member 50 are also overlapped, and the connecting member 50 is connected to the first connecting portion 26 of the first engagement piece 18 by inserting an axis 60 therethrough. With these connections, both engagement pieces 18, 20 are axially attached by the axis 58, and are configured to be freely opened and closed by the connecting member 50.

[0018] <Structure of anti-skid claws> 1 to 3, the anti-skid claws 16 are provided at least on the lower side of the shaft 58, and are members for preventing lateral slippage and the associated downward slippage. In this embodiment, the anti-skid claws 16 are provided above and below the shaft 58. FIG. 13 is a plan view of the anti-skid claw. As shown in FIG. 13, the skid prevention claw 16 is composed of an arc-shaped portion 62 and a shaft portion 64. In this embodiment, the arc-shaped portion 62 has a half-split ellipse shape, and the elliptical side 66 is formed in a sawtooth shape and functions as a pressing portion 68. A recess 70 is provided in the center of the arc-shaped portion 62 so as to cut out a part of the pressing portion 68. This recess 70 has a width and depth that allow a protrusion of a rotation limiting member, which will be described later, to fit into it.

[0019] A substantially circular shaft portion 64 extends from the straight side 72 of the arc-shaped portion 62, and a shaft hole 74 is formed in the shaft portion 64. The shaft portion 64 is formed with a diameter smaller than the major axis of the ellipse of the arc-shaped portion 62. 2, the anti-skid claw 16 is attached in such a manner that the pressing portion 68 is disposed on the side of the retaining space 36 of the scaffolding component formed when the mounting portion 12 is in the closed state, and is attached so as to be freely rotatable about the shaft 58. More specifically, the attachment position is determined so that the recess 70 faces the retaining space 36 side when the mounting portion 12 is in the closed state. When the skid prevention claw 16 rotates, the pressing portion 68 presses the side surface of the scaffolding component held within the holding space 36. That is, when the recess 70 faces the holding space 36, the skid prevention claw 16 does not protrude into the holding space 36, but is arranged so that the pressing portion 68 protrudes into the holding space 36 by rotating to the left or right.

[0020] <Configuration of rotation limiting member> 1 to 3, the safety belt attachment device 10 of this embodiment further includes a rotation limiting member 76. The rotation limiting member 76 is attached to limit the rotation of the skid prevention claw 16 when the attachment part 12 is in the closed state. FIG. 14 is a front view of the rotation limiting member, and FIG. 15 is a plan view thereof. As shown in FIGS. 14 and 15, the rotation limiting member 76 is composed of a base portion 78, an arcuate portion 80, and a protruding portion 82. As shown in FIG. The base 78 is formed of a substantially rectangular flat plate member. A short side 84 of the base 78 has a length such that it can be sandwiched between the grooves 38, 40 formed on one end side of each engagement piece 18, 20 when the mounting part 12 is in the closed state. A long side 86 of the base 78 is formed to a length that is approximately the same as the distance between the inner surfaces of the two anti-skid claws 16, 16 attached above and below the shaft 58, or slightly shorter than that distance.

[0021] The arcuate portions 80 stand upright from the central regions of both long sides 86 of the base 78, and when viewed from the short side 84 side, the inner sides are formed in an arc shape, and the two arcuate portions 80 form a circular region 88 having an inner diameter into which the shaft 58 can be fitted. The upper ends 90 of the two arcuate portions 80 are spaced apart, and the space T1 is formed narrower than the diameter of the shaft 58, and is set to a width that allows the shaft 58 to be fitted when the rotation limiting member 76 is attached to the shaft 58. The width T2 of the arcuate portion 80 when viewed from the long side 86 side is formed to be approximately the same as the width between the innermost faces of the shaft portions of the overlapped engagement pieces 18, 20, or slightly shorter than the width. In this embodiment, the width T2 of the arcuate portion 80 is formed to be approximately the same as the width of the U-shaped second shaft portion 28 of the second engagement piece 20 located on the inside when the engagement pieces 18, 20 are overlapped at the shaft portions, or slightly shorter than the width.

[0022] The convex portions 82 are each provided to extend outward from the central region of each of the two short sides 84 of the base 78, and have a thickness, width and height that enable them to be fitted into the concave portions 70 of the anti-skid claws 16 described above. The convex portion 82 is set to break when a load equal to or greater than a predetermined value is applied. The type of material and the shape, thickness, width, height, and other factors of the convex portion 82 are appropriately adjusted so that the convex portion 82 does not break under loads that occur during normal work, but breaks when a load equal to or greater than a predetermined value is applied. In this embodiment, the convex portion 82 is adjusted so that it breaks when a load of 2 to 3 kN is applied. If the load falls within the above range, the convex portion 82 will not break under loads that occur during normal work, but will break when a large lateral load is applied during a fall. Examples of materials that can be used to form the rotation limiting member 76 include polyacetal resin (POM), polystyrene resin (PS), acrylonitrile butadiene styrene resin (ABS), nylon resin (PA), etc. Of these, nylon resin (PA) is particularly preferable.

[0023] The rotation-limiting member 76 is rotatably attached to the shaft 58 by fitting the shaft 58 into a circular region 88 formed by both arcuate portions 80. The attached rotation-limiting member 76 is configured to be removable from the shaft 58. As shown in Figures 1 and 2, the attachment direction of the rotation-limiting member 76 is determined so that the rotation-limiting member 76 is fitted onto the shaft 58 from the retaining space 36 side of the attachment portion 12 outward. By mounting the rotation limiting member 76 on the shaft 58 in this manner, the convex portion 82 fits into the concave portion 70 of the skid prevention claw 16. This allows the rotation of the skid prevention claw 16 and the rotation of the rotation limiting member 76 to be linked. Furthermore, the rotation limiting member 76 is configured such that, when the mounting portion 12 is in the closed state, the base 78 is sandwiched between the grooves 38, 40 provided on the shaft sides of the engagement pieces 18, 20. This limits the rotation of the rotation limiting member 76 when the mounting portion 12 is in the closed state. With the rotation limiting member 76 being restricted, the rotation of the skid prevention claw 16, which is linked to the rotation limiting member 76, is also limited.

[0024] <Configuration of the annular section> FIG. 16 is a plan view of the annular portion, and FIG. 17 is a front view thereof. As shown in Figs. 16 and 17, the loop portion 14 is a member for engaging a hook of a safety belt. The annular portion 14 is composed of a body portion 92 , a shaft portion 94 , and an upright portion 96 . The body 92 is formed into a substantially U-shape by bending a substantially rectangular flat plate member at the center. A substantially circular shaft 94 is provided at each end of the body 92, and a shaft hole 98 is formed in the shaft 94. The shaft 94 of the annular portion 14 is formed to have substantially the same diameter as the shaft 64 of the skid prevention claw 16. The erected portions 96 extend radially from a position adjacent to the body portion 92 of the shaft portion 94 around the center of the shaft hole 98, and are provided so as to erect further outward. The erected portions 96 are formed to erect at a position where, when the center of the shaft hole 98 is taken as the center, the diameter of the erected portions 96 is larger than the diameter of the shaft portion 64 of the anti-skid claw 16, and smaller than the major axis of the ellipse of the arc-shaped portion 62. The erected portions 96 are provided on both the left and right sides of the body portion 92.

[0025] 2 and 3, the annular portion 14 is oriented so that the substantially U-shaped body 92 is positioned outside the holding space 36 formed when the mounting portion 12 is in the closed state, and is attached so as to be rotatable about the shaft 58. The annular portion 14 is axially attached to the shaft 58, whereby the annular portion 14 and the shaft 58 form a ring 100 for engaging the hook of a safety belt. The erected portion 96 is disposed in an area located outward of the shaft portion 64 of the skid prevention claw 16. A rotation locus M (indicated by a dashed line in FIG. 2) of the erected portion 96 caused by the rotation of the annular portion 14 is located outward of the shaft portion 64 and inward of the locus of the major axis of the ellipse of the arc-shaped portion 62. In addition, the erected portion 96 is configured to come into contact with the straight side 72 of the arc-shaped portion 62 when the annular portion 14 is rotated.

[0026] <How to use the safety belt attachment device> Next, a method of using the safety belt attachment device having the above configuration will be described. This safety belt attachment device 10 is mainly attached to the vertical members of the floor where work is to be performed on scaffolding set up at a construction site. Then, the worker performs work with the hook of the safety belt hooked to this attached safety belt attachment device. Fig. 18 is a plan view of the safety belt attachment device when the attachment part is in an open state, and Fig. 19 is a view showing the state in which the safety belt attachment device of this embodiment is attached to a vertical member. 18, the connecting member 50 is removed from the bifurcated portion 48, and the mounting portion 12 is in an open state. In this open state, the rotation limiting member 76 is not sandwiched between the grooves 38 and 40, so the rotation limiting member 76 and the anti-skid claw 16 interlocking with it can rotate freely. If the rotation limiting member 76 is not attached to the safety belt attachment device 10, the upper and lower skid prevention claws 16 are able to rotate independently. If the skid prevention claws 16 are allowed to rotate independently when attaching the safety belt attachment device 10 to a scaffolding component, the pressing portion 68 will be positioned to protrude toward the retaining space 36 and will hit the side of the scaffolding component, making it impossible to attach the safety belt attachment device 10 to the scaffolding component in this state. Therefore, when attaching the safety belt attachment device 10 to a scaffolding component, the position of the skid prevention claws 16 must be repositioned so that the recess 70 faces the retaining space 36.

[0027] By attaching the rotation limiting member 76, the protrusions 82 are fitted into the recesses 70, and the rotation limiting member 76 and the anti-skid claws 16 positioned above and below it are respectively connected and interlocked. The vertical member 102 is sandwiched between the engagement pieces 18, 20, and the mounting part 12 is closed to be in the closed state. As a result, the long side 86 of the base 78 of the rotation-limiting member 76 is sandwiched between the grooves 38, 40 of the engagement pieces 18, 20. In this sandwiched state, the rotation of the rotation-limiting member 76 is restricted. Furthermore, the rotation of the skid prevention claw 16, which is linked to the rotation-limiting member 76, is also restricted. Furthermore, due to this clamping, the protrusion 82 of the rotation limiting member 76 is disposed so as to face the retaining space 36. Therefore, the recess 70 of the skid prevention claw 16 fitted with the protrusion 82 is also disposed so as to face the retaining space 36. Then, the connecting member 50 is fitted into the bifurcated portion 48, and the ends of both the engaging pieces 18, 20 are tightened with a nut 56. The suitable tightening torque is 25 to 35 N·m. This completes the attachment of the safety belt attachment device 10 to the vertical member 102, as shown in FIG.

[0028] The safety belt attachment device 10 attached to the vertical member 102 as described above is used by engaging the hook of the safety belt with the loop portion 14. Hereinafter, assuming that the direction of the loop portion 14 when the safety belt attachment device 10 is attached to the vertical member 102 is the front (0 degrees), work within a range of 45 degrees left and right from the front will be referred to as "normal range work", and work in a range exceeding 45 degrees left and right from the front will be referred to as "lateral range work".

[0029] During normal range work, the lateral load applied in the event of a fall is small. Therefore, the lateral load does not exceed the static friction force generated between the safety belt attachment device 10 and the vertical member 102, and the safety belt attachment device 10 is prevented from sliding sideways. Furthermore, with respect to a downward load, the safety belt attachment device 10 is fastened by the connecting member 50, thereby preventing the safety belt attachment device 10 from sliding downward. Even if the fastening to the vertical member 102 is loose, in the event of a fall, the safety belt attachment device 10 is pulled from the loop portion 14 as a starting point, the safety belt attachment device 10 tilts diagonally downward, and the pressing portion 68 of the anti-slip claw 16 provided on the underside of the shaft 58 bites into and grips the side of the vertical member 102. Therefore, the safety belt attachment device 10 does not slip off the vertical member 102, and safety is maintained.

[0030] When working in the lateral range, a large load is applied in the lateral direction in the event of a fall. When a lateral load of a certain magnitude or more is applied, the annular portion 14 rotates in the direction in which the load is applied, and the erected portion 96 comes into contact with the straight side 72 of the arc-shaped portion 62 of the skid prevention claw 16, transmitting the load to the skid prevention claw 16. The load transmitted to the skid prevention claw 16 is transmitted to the protrusion 82 of the rotation limiting member 76 that is fitted into the recess 70. When a load of a predetermined magnitude or more is applied to the protrusion 82, the protrusion 82 breaks, and the connection between the rotation limiting member 76 and the skid prevention claw 16 is released. In other words, when a lateral load of a predetermined magnitude or more is applied, the rotation restriction of the skid prevention claw 16 is released. The now rotatable anti-skid claw 16 rotates in the direction in which the load is applied, and its pressing portion 68 bites into and grips the side surface of the vertical member 102. This prevents the safety belt attachment from skidding, ensuring safety.

[0031] <Effects of the embodiment> According to this embodiment, the following effects can be obtained. In this embodiment, the anti-slip claws 16 are provided at least on the lower side of the shaft 58. Even if a large load is applied in the lateral direction due to a fall during work in the lateral range, the anti-slip claws 16 bite into the vertical member 102 to suppress the movement, thereby preventing the safety belt attachment device 10 from slipping sideways. When the safety belt attachment device 10 falls, it is pulled downward starting from the loop portion 14, but since the anti-slip claws 16 attached to the lower side of the shaft 58 bite into and grip the vertical member 102, the safety belt attachment device 10 will not slip off the vertical member 102 even if the fastening during attachment is loose, and safety is maintained.

[0032] In addition, a sawtooth pressing portion 68 is formed on the elliptical side 66 of the anti-slip claw 16. In the event of a fall, this sawtooth pressing portion 68 firmly bites into the vertical member 102, firmly preventing the safety belt fastening device 10 from slipping sideways. The skid prevention claw 16 is attached rotatably to the shaft 58, and when the skid prevention claw 16 rotates, the pressing portion 68 presses the vertical member 102 held in the holding space 36. As a result, when the skid prevention claw 16 rotates due to a fall during work in the lateral range and a load of a predetermined level or more is applied in the lateral direction, the pressing portion 68 bites into the side of the vertical member 102 and grips it. In addition, anti-slip claws 16 are provided above and below the shaft 58. With this configuration, even if the worker attaches the safety belt fastening device 10 upside down, the anti-slip claws 16 will always be located below the shaft 58. Therefore, the worker can attach this safety belt fastening device 10 without worrying about the up-down direction, and lateral slippage and the associated downward slippage can be prevented in either the up-down or up-down attachment direction.

[0033] In addition, the structure is provided with a rotation limiting member 76 that limits the rotation of the skid prevention claw 16. The rotation limiting member 76 makes it possible to limit the movement of the skid prevention claw 16 during normal operation. Therefore, during normal operation, the skid prevention claw 16 does not bite into the vertical member 102 due to its rotation, and the surface of the vertical member 102 is not damaged. The anti-slip claws 16 are provided with recesses 70, and the rotation limiting member 76 is provided with protrusions 82, with the protrusions 82 being maintained in a state of being fitted into the recesses 70. By maintaining the recesses 70 and the protrusions 82 in a fitted state, the anti-slip claws 16 and the rotation limiting member 76 are connected, and their operations are linked. Therefore, when the safety belt attachment device 10 is attached to the vertical member 102, the anti-slip claws 16 do not rotate independently, but are arranged so that the anti-slip claws 16 are also oriented in an appropriate direction in conjunction with the orientation of the rotation limiting member 76, so that the safety belt attachment device 10 can be easily attached to the vertical member 102.

[0034] In addition, the rotation limiting member 76 is configured such that when a load of a predetermined level or more is applied, the protrusion 82 breaks, thereby releasing the rotation limit of the skid prevention claw 16. As a result, the rotation limit of the skid prevention claw is released only when a lateral load of a predetermined level or more is applied during a fall. The rotation limiting member 76 is attached to the shaft 58 and is configured to be detachable from the shaft 58. As a result, even if the rotation limiting member 76 is damaged and the rotation limiting function is lost, the rotation limiting function of the safety belt attachment device 10 can be restored by replacing this rotation limiting member 76. The annular portion 14 is axially attached by the shaft 58, and has an erected portion 96 provided in an area located on the opposite side to the arc side of the skid prevention claw 16, and the erected portion 96 is configured to transmit the load accompanying the rotation of the annular portion 14 to the skid prevention claw 14. As a result, when a lateral load of a predetermined magnitude or more is applied during a fall, the load is transmitted from the annular portion 14 to the skid prevention claw 16.

[0035] <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 scaffolding component is sandwiched between both engaging pieces 18, 20 to close the mounting part 12, and the connecting member 50 is fitted into the bifurcated part 48 and fixed by tightening the nut 56, but the present invention is not limited to this. For example, a latch mechanism that can maintain the closed state of both engaging pieces 18, 20 may be provided. [Industrial Applicability]

[0036] The safety belt attachment device described above is suitable for use when working on scaffolding that does not have handrails. [Explanation of symbols]

[0037] 10 Safety belt attachment 12 Mounting part 14 Annular section 16 Anti-skid claws 36 Holding space 58 Axis 68 Pressing part 70 Recess 76 Rotation limiting member 82 Convex 96 Vertical section

Claims

1. An attachment part that can be detachably attached to a scaffolding component; A loop portion to which a hook of a safety belt can be attached; In a safety belt attachment device equipped with The first and second engagement pieces of the mounting portion and the annular portion are pivotally connected to each other by a shaft, so that the mounting portion can be opened and closed freely, and the annular portion is attached so as to be rotatable, A skid prevention claw is provided at least on the lower side of the shaft, is attached to the shaft so as to be freely rotatable, and has a pressing portion disposed on the side of the retaining space of the scaffolding component formed when the mounting portion is in a closed state; The vehicle further includes a rotation limiting member that limits rotation of the anti-skid claw when the mounting portion is in a closed state. A load caused by the rotation of the annular portion is transmitted to the anti-skid claw, and when the anti-skid claw rotates with the rotation restriction released, the pressing portion presses the scaffolding component held in the holding space. A safety belt attachment device characterized by the above.

2. The anti-skid claw is formed in at least an arc shape on the side of the holding space, and the pressing portion is formed in a sawtooth shape on the arc side.

2. A safety belt attachment device according to claim 1.

3. The anti-skid claws are provided above and below the shaft.

2. A safety belt attachment device according to claim 1.

4. The anti-skid claw is provided with a recess, and the rotation limiting member is provided with a protrusion, The projection is maintained in a fitted state in the recess, so that rotation of the skid prevention claw is restricted when the mounting portion is in a closed state.

2. A safety belt attachment device according to claim 1.

5. The rotation limiting member is configured such that, when a load equal to or greater than a predetermined value is applied, the protrusion breaks, thereby releasing the restriction on the rotation of the skid prevention claw. A safety belt attachment device according to claim 4.

6. The rotation limiting member is attached to the shaft and is configured to be detachable from the shaft. A safety belt attachment device according to any one of claims 1, 4 or 5.

7. The annular portion is provided with a standing portion in an area located on the opposite side to the arc side of the skid prevention claw, and the standing portion is configured to transmit a load caused by rotation of the annular portion to the skid prevention claw.

3. A safety belt attachment device according to claim 2.

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