Fall prevention appliance

Abstract

To more surely suppress breaking of a rope in a state in which the rope is drawn from a drum by the largest distance.SOLUTION: A rope insertion part 45 is provided on a drum trunk 41, and into the rope insertion part, a terminal part of a rope 31 is inserted. A protrusion part 50 is provided on the rope insertion part 45. The protrusion part 50 is provided on a part which is outside D2 of a rope insertion orthogonal direction, on the end of the side (A2) where the rope 31 is drawn of the rope insertion part 45. The protrusion part 50 has a curved surface 51. The curved surface 51 is curved in a salient state to the inside D1 of the rope insertion orthogonal direction, so as to support the rope 31 from the outside D2 of the rope insertion orthogonal direction when the rope 31 is drawn by the largest distance from the drum trunk 41.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a fall prevention device for preventing an object from falling. [Background technology]

[0002] For example, Patent Document 1 describes a conventional fall prevention device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-152316 A Summary of the Invention [Problem to be solved by the invention]

[0004] In fall arrest devices, the end of the rope may be inserted into an insertion part (such as a hole or a groove) in the drum body and attached to the drum body. In this case, when the rope is fully pulled out from the drum and a tensile load is applied to the rope, the rope may come into contact with the exit part of the insertion part in the drum body, causing the rope to bend and break.

[0005] Therefore, an object of the present invention is to provide a fall prevention device that can more reliably prevent the rope from breaking when the rope is fully pulled out from the drum. [Means for solving the problem]

[0006] The fall prevention device includes a case, a drum, and a rope. The drum is disposed inside the case and is rotatable relative to the case. The rope can be wound around the drum, can be unwound from the drum, and is pulled out from the case. The drum includes a drum body, a rope insertion portion, a rope attachment portion, and a protrusion portion. The drum body can wind the rope. The rope insertion portion is provided on the outer periphery and inside of the drum body. The end portion of the rope is inserted into the rope insertion portion. The rope attachment portion is a portion to which the end portion of the rope inserted into the rope insertion portion is attached, and is disposed at a position offset from the rotation axis of the drum relative to the case. The protrusion portion is provided on the rope insertion portion. A direction perpendicular to each of the direction of the rotation axis of the drum and the direction in which the rope insertion portion extends is defined as a rope insertion orthogonal direction. The outer side of the drum radial direction in the rope insertion orthogonal direction is defined as the rope insertion orthogonal direction outer side. The drum radially inward in the rope insertion orthogonal direction is defined as the rope insertion orthogonal direction inner side. The protrusion is provided on a portion of the rope insertion portion, at the end of the rope insertion portion from which the rope is pulled out, that is outer in the rope insertion orthogonal direction. The protrusion has a curved surface. The curved surface is curved convexly inward in the rope insertion orthogonal direction so as to support the rope from the outer side in the rope insertion orthogonal direction when the rope is in a state in which it is pulled out to the maximum from the drum body portion. Effect of the Invention

[0007] With the above configuration, it is possible to more reliably prevent the rope from breaking when the rope is fully pulled out from the drum. [Brief description of the drawings]

[0008] [Figure 1] 1A to 1C are diagrams showing an example of how the fall prevention device 1 is used. [Diagram 2] 2 is a view of the fall prevention device 1 shown in FIG. 1 as viewed from the drum axial direction Z. [Diagram 3]4. This is a diagram showing the inside of the fall prevention device 1 shown in FIG. 2 as seen from the drum axial direction Z, and is a cross-sectional view taken along the arrows F3-F3 in FIG. [Figure 4] 3 is a side view of the inside of the fall prevention device 1 shown in FIG. 2. FIG. [Diagram 5] 4 is a diagram showing the inside of the fall prevention device 1 in a state in which the rope 31 shown in FIG. 3 is fully pulled out, as viewed from the drum axial direction Z. FIG. [Figure 6] 6 is an enlarged view of a rope insertion portion 45 and the like shown in FIG. 5. FIG. [Figure 7] 7 is an enlarged view of the protrusion 50 and other parts shown in FIG. 6. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The fall prevention device 1 will be described with reference to Figs.

[0010] As shown in FIG. 1, the fall prevention device 1 is a device that prevents the fall of a fall prevention object W. The fall prevention object W may be a person or may not be a person. For example, the fall prevention object W may be a worker, a worker working at a height, or a worker at a construction site. The fall prevention device 1 may be a device that prevents the fall of a worker in the unlikely event that the worker steps off the scaffold. The fall prevention device 1 is supported by a support S1. For example, the support S1 is a structure at a work site (e.g., a beam). The fall prevention device 1 may be directly supported by the support S1 or indirectly supported by the support S1, and specifically, may be connected to the support S1 via a connector S2, a belt-shaped member S3, or the like. The fall prevention device 1 (more specifically, a rope member 30) is connected to the fall prevention object W, and specifically, may be attached to a harness worn by the worker, or a belt worn around the worker's waist. As shown in FIG. 3, the fall prevention device 1 includes a case 11, a shaft portion 13, a drum biasing device 15 (see FIG. 4), a ratchet device 20 (see FIG. 2), a rope member 30, and a drum 40 (see FIG. 3).

[0011] Case 11 houses drum 40 and the like. For example, case 11 is configured to be disassembled in drum axial direction Z (described later) (see FIG. 4). Case 11 has connection part 11a and rope outlet 11b. Connection part 11a is a portion to which a member (e.g., connector S2, belt-shaped member S3, etc.) to be connected to support S1 (see FIG. 1) shown in FIG. 1 is attached. For example, as shown in FIG. 2, connection part 11a is a hole or the like provided in case 11. Rope outlet 11b is a portion through which rope 31 is passed. Rope outlet 11b is a hole (opening) or the like provided in case 11.

[0012] As shown in Fig. 3, the shaft portion 13 is a portion that becomes the rotation shaft of the drum 40. The shaft portion 13 is disposed inside the case 11. For example, the shaft portion 13 may be columnar or cylindrical. The shaft portion 13 may be fixed to the case 11, or may be rotatably attached to the case 11.

[0013] The drum biasing device 15 (see FIG. 4) biases the drum 40 toward the drum winding side C1 (described later) relative to the case 11. The drum biasing device 15 biases the drum 40 so as to reduce slack in the rope 31. The drum biasing device 15 is disposed inside the case 11. The drum biasing device 15 has, for example, a spiral spring.

[0014] The ratchet device 20 (see FIG. 2) restricts the drum 40 from rotating toward the drum pay-out side C2 (described later) relative to the case 11 at a speed greater than a predetermined speed. The ratchet device 20 allows the drum 40 to rotate toward the drum pay-out side C2 relative to the case 11 at a speed less than a predetermined speed. The ratchet device 20 allows the drum 40 to rotate toward the drum wind-up side C1 relative to the case 11. The ratchet device 20 is disposed inside the case 11.

[0015] The rope member 30 is connected to a fall prevention object W (see FIG. 1). The rope member 30 is wound around a drum 40 and attached to a rope attachment part 46 (described later). The rope member 30 includes a rope 31, a loop part 35, and an end member 37.

[0016] The rope 31 may be made of metal (wire rope), for example, or may not be made of metal. The rope 31 is wound around the drum body 41 and unwound from the drum body 41. The rope 31 is pulled out from inside the case 11 to outside the case 11 through the rope pull-out port 11b. As shown in FIG. 6, the central axis direction of the rope 31 (more specifically, the central axis direction of the part of the rope 31 excluding the annular part 35) is the rope central axis direction A. In the rope central axis direction A, the side attached to the rope attachment part 46 (described later) of the drum 40 is the rope counter-pulling side A1, and the opposite side is the rope pull-out side A2. As shown in FIG. 7, the rope 31 includes a first region 31a, a second region 31b, and a rope end part 31e (see FIG. 6).

[0017] The first region 31a and the second region 31b are partial regions of the rope 31, and are regions in the rope central axis direction A. The first region 31a is a region where the rope 31 contacts a curved surface 51 (described later). The second region 31b is a region between the end member tip portion 37b and the first region 31a.

[0018] As shown in Fig. 6, rope end portion 31e is an end portion of rope 31. Rope end portion 31e is an end portion of rope 31 in rope central axis direction A. "End portion" means the end and its surrounding portion (hereinafter the same). Rope end portion 31e is an end portion on the rope counter-pulling side A1 of both ends of rope 31 in rope central axis direction A.

[0019] The loop portion 35 is a portion that is attached to the rope attachment portion 46. The loop portion 35 may be, for example, a portion formed by the rope 31 (more specifically, the rope end portion 31e) or may be a part of the end member 37 (not shown).

[0020] The end member 37 is a member for attaching the rope 31 to the drum 40 (more specifically, the rope attachment portion 46). The end member 37 is attached to the rope end portion 31e. For example, the end member 37 may be a member for forming the annular portion 35 by the rope 31, and more specifically, may be a member (crimping member) for crimping parts of the rope 31 together. Specifically, for example, the end member 37 may be a sleeve-shaped (crimping sleeve). For example, the end member 37 may be tubular or approximately tubular, and more specifically, may be cylindrical or approximately cylindrical, or may be square or approximately square. The end member 37 may be a member including the annular portion 35, for example (not shown). In the following, a case where the end member 37 is a sleeve-shaped member for forming the annular portion 35 of the rope 31 will be mainly described. The end member 37 includes an end member outer peripheral portion 37a and an end member tip portion 37b.

[0021] The end member outer peripheral portion 37a is the outer peripheral portion (outer peripheral surface) of the end member 37. When the end member 37 is cylindrical or approximately cylindrical, the end member outer peripheral portion 37a is a cylindrical surface. When the end member 37 is angular tubular or approximately angular tubular, the end member outer peripheral portion 37a is a angular tubular surface.

[0022] The terminal member tip portion 37b is an end portion of the terminal member 37 on the rope-pulling side A2.

[0023] As shown in FIG. 3, the drum 40 is a member around which the rope 31 is wound. The drum 40 is disposed inside the case 11. The drum 40 is rotatable relative to the case 11. The rotation axis of the drum 40 relative to the case 11 is the drum rotation axis 40a. The direction in which the drum rotation axis 40a extends is the drum axial direction Z. The radial direction based on the drum rotation axis 40a is the drum radial direction R. More specifically, the diameter direction of a virtual circle that is perpendicular to the drum rotation axis 40a and has the drum rotation axis 40a as its center is the drum radial direction R. In the drum radial direction R, the side approaching the drum rotation axis 40a is the drum radial inner side R1, and the side moving away from the drum rotation axis 40a is the drum radial outer side R2. The direction along the circumference of the virtual circle is the drum circumferential direction C. In the drum circumferential direction C, the direction of rotation of the drum 40 when the drum 40 winds up the rope 31 is referred to as the drum winding side C1, and the direction of rotation of the drum 40 when the drum 40 pays out the rope 31 is referred to as the drum payout side C2. When viewed from the drum axial direction Z, the drum 40 may be circular or approximately circular. The drum 40 includes a drum body portion 41, a drum flange portion 43, a rope insertion portion 45, a rope attachment portion 46, an end member facing portion 47, and a protrusion portion 50.

[0024] The drum body 41 is capable of winding up the rope 31. As shown in Fig. 5, when the rope 31 is pulled out to the maximum from the drum 40 (from the drum body 41) (hereinafter also referred to as the "pulled out state"), the rope 31 is not wound around the drum body 41. The drum body 41 includes a drum body outer circumferential portion 41a, a drum body inner circumferential portion 41b, and a drum body interior 41c.

[0025] The drum body outer peripheral portion 41a is provided on the outer radial R2 portion of the drum body 41. The drum body outer peripheral portion 41a is generally cylindrical and centered on the drum rotation shaft 40a, except for the rope insertion portion 45 (similar to the drum body inner peripheral portion 41b). The drum body inner peripheral portion 41b is provided on the inner radial R1 portion of the drum body 41.

[0026] The drum body interior 41c is disposed radially inward R1 of the drum body outer periphery 41a. The drum body interior 41c is disposed radially outward R2 of the drum body inner periphery 41b. The drum body interior 41c may include a hollow portion, may have a structure including a hollow portion and a rib, or may include a solid portion. For example, a rib may be provided to connect the drum body outer periphery 41a and the drum body inner periphery 41b. However, the portion of the drum body interior 41c where the rope insertion portion 45 is located is hollow.

[0027] As shown in Fig. 4, the drum flange portion 43 limits movement of the rope 31 wound around the drum body portion 41 in the drum axial direction Z. The drum flange portion 43 is fixed to the drum body portion 41. The drum flange portion 43 protrudes from both outer ends of the drum body portion 41 in the drum axial direction Z toward the outer side R2 in the drum radial direction as shown in Fig. 5.

[0028] As shown in Fig. 6, the rope insertion portion 45 is a portion into which the rope end portion 31e is inserted. For example, the rope insertion portion 45 is an opening (e.g., a hole or a groove) provided in the drum body portion 41. The rope insertion portion 45 is provided so as to extend in a direction intersecting (e.g., perpendicular to) each of the drum axial direction Z and the drum radial direction R. The rope insertion portion 45 is provided so as to extend in a direction that coincides with or substantially coincides with the direction in which a chord of a circle that coincides with the drum body outer circumferential portion 41a extends when viewed from the drum axial direction Z. The rope insertion portion 45 includes a rope insertion portion interior 45a and a rope insertion portion outlet portion 45b.

[0029] (Rope insertion direction E, rope insertion perpendicular direction D) The direction in which the rope insertion portion 45 extends is defined as the rope insertion direction E. For example, the rope insertion direction E is the direction in which the end member opposing portion 47 extends when viewed from the drum axial direction Z. The direction perpendicular to each of the rope insertion direction E and the drum axial direction Z is defined as the rope insertion orthogonal direction D. The drum radial inner side R1 in the rope insertion orthogonal direction D is defined as the rope insertion orthogonal direction inner side D1, and the drum radial outer side R2 in the rope insertion orthogonal direction D is defined as the rope insertion orthogonal direction outer side D2. The rope insertion orthogonal direction inner side D1 is the side on which the rope 31 extending from the end member tip portion 37b to the rope pull-out side A2 bends in the rope insertion orthogonal direction D when the rope 31 is wound around the drum body portion 41 (see FIG. 3). The outer side D2 of the rope insertion orthogonal direction is the side on which the rope 31 extending from the end member tip 37b to the rope pull-out side A2 bends in the vicinity of the end member tip 37b when the rope 31 is in the pulled-out state.

[0030] The rope insertion portion interior 45a is provided in the drum barrel interior 41c. The rope insertion portion outlet 45b is the boundary between the inside and outside of the rope insertion portion 45 and the portion in its vicinity. The rope insertion portion outlet 45b communicates between a space on the outer side R2 in the drum radial direction of the drum barrel outer periphery 41a and a space on the inner side R1 in the drum radial direction of the drum barrel outer periphery 41a (i.e., the drum barrel interior 41c, the rope insertion portion interior 45a).

[0031] The rope attachment portion 46 is a portion to which the rope end portion 31e is attached. More specifically, the rope attachment portion 46 is a portion to which the rope end portion 31e inserted into the rope insertion portion 45 is attached. The rope attachment portion 46 is provided in the rope insertion portion interior 45a. The rope attachment portion 46 is disposed at a position offset from the drum rotation shaft 40a. More specifically, the rope attachment portion 46 is disposed on the drum radial outer side R2 from the drum rotation shaft 40a. The rope attachment portion 46 has a shape to which the rope end portion 31e can be attached. For example, the rope attachment portion 46 has a shape to which the annular portion 35 can be attached. Specifically, for example, the rope attachment portion 46 is a columnar shape (for example, a cylindrical shape) with the drum axial direction Z as the central axis or approximately the central axis. The rope attachment portion 46 is fixed to the drum trunk portion 41.

[0032] The end member facing portion 47 is a portion arranged to face the end member 37. The end member facing portion 47 is provided on the outer side D2 of the rope insertion portion 45 in the rope insertion orthogonal direction. The end member facing portion 47 is a surface that constitutes a part of the rope insertion portion 45. When the rope 31 is in a state where it is pulled out most from the drum body portion 41 (pulled out state), the end member facing portion 47 is arranged to follow the outer surface of the end member 37 (for example, the end member outer peripheral portion 37a). The end member facing portion 47 may be flat or curved. The end member facing portion 47 is arranged to extend in the rope insertion direction E. The end member 37 may or may not come into contact with the end member facing portion 47.

[0033] The protrusion 50 is a portion for suppressing bending of the rope 31 and suppressing breakage of the rope 31 more reliably (more reliably than in the prior art). The details of the function of the protrusion 50 are as follows. As shown in FIG. 5, a case will be described where the rope 31 is in a withdrawn state and a tensile load acts on the application point 31f of the rope 31. A straight line connecting the connection part 11a and the application point 31f is taken as a straight line L. When a tensile load acts on the rope 31, the extension direction of the straight line L coincides (or almost coincides) with the direction of the tensile load. When a tensile load acts on the rope 31, the rope 31 extends in a straight line or almost a straight line between the protrusion 50 and the vicinity of the application point 31f. When a tensile load acts on the rope 31, a force acts on the rope attachment part 46 from the rope 31 (rope end part 31e). Since the rope attachment portion 46 and the drum rotation shaft 40a are offset in the drum radial direction R, the force acting on the rope attachment portion 46 from the rope 31 (rope end portion 31e) causes the drum 40 to rotate toward the drum payout side C2. For example, the center of the rope attachment portion 46 approaches the straight line L, causing the drum 40 to rotate toward the drum payout side C2. Here, the rope 31 is pulled out from the inside of the case 11 to the outside through the rope attachment portion 46, the rope insertion portion outlet portion 45b, and the rope pull-out port 11b. Therefore, the rope 31 is strongly pressed against a member (a part of the drum body portion 41) constituting the rope insertion portion outlet portion 45b, and is bent at the rope insertion portion outlet portion 45b. Therefore, as shown in FIG. 6, a protrusion portion 50 is provided at the rope insertion portion outlet portion 45b. Then, the rope 31 comes into contact with the curved surface 51 (described later) of the protrusion 50, thereby preventing the rope 31 from excessively bending at the rope insertion outlet 45b, and more reliably preventing the rope 31 from breaking. Note that the arrangement (angle, etc.) of the case 11, drum 40, and rope member 30 shown in FIG. 5 is one example. Depending on the magnitude of the tensile load, the dimensions of each member, and the like, the case 11, drum 40, and rope member 30 may be arranged in various ways. For example, in the example shown in FIG. 5, the rope 31 is bent at the rope outlet 11b, but the rope 31 may be arranged to extend in a straight line at the rope outlet 11b.

[0034] This protrusion 50 is provided on the drum radial outer side R2 of the rope insertion outlet 45b (i.e., the end of the rope withdrawal side A2 of the rope insertion 45). As shown in FIG. 7, the protrusion 50 protrudes toward the inner side D1 of the rope insertion orthogonal direction from the end member facing part 47. It is preferable that the protrusion height 50h is set so that the rope central axis direction A in the second region 31b is a straight line (or an approximately straight line). The protrusion height 50h is the height of the protrusion 50 from the end member facing part 47 toward the inner side D1 of the rope insertion orthogonal direction. In addition, the length in the radial direction of the rope 31 from the outer peripheral surface of the rope 31 to the outer surface of the end member 37 (for example, the end member outer peripheral part 37a) is defined as the end member thickness 37t. At this time, it is preferable that the protrusion height 50h is approximately the same as the end member thickness 37t. It is more preferable that the protrusion height 50h is equal to or greater than the end member thickness 37t. In this case, bending of the rope 31 in the second region 31b is suppressed, and therefore breakage of the rope 31 is more reliably suppressed. The protrusion 50 includes a curved surface 51, a protrusion base end portion 53, and a protrusion boundary portion 55.

[0035] The curved surface 51 is a surface that is curved to suppress bending of the rope 31 (to improve the way the rope 31 fits). The curved surface 51 is provided on the inner side D1 of the protrusion 50 in the direction perpendicular to the rope insertion. The curved surface 51 is arranged so as to contact the rope 31 when the rope 31 is in the pulled-out state. The curved surface 51 is arranged so as to support the rope 31 from the outer side D2 in the direction perpendicular to the rope insertion when the rope 31 is in the pulled-out state. The curved surface 51 is curved convexly toward the inner side R1 in the drum radial direction. When viewed from the drum axial direction Z, the curved surface 51 is arc-shaped, for example, arc-shaped (R-shaped) or approximately arc-shaped.

[0036] The curved surface 51 is preferably shaped so that the contact area between the curved surface 51 and the rope 31 is as large as possible. For example, the shape of the curved surface 51 is preferably set so that the first region 31a is as large as possible (long in the rope central axis direction A). For example, when the curved surface 51 is arc-shaped when viewed from the drum axis direction Z, the radius of curvature of the curved surface 51 is preferably as large as possible. Specifically, for example, when the positions, sizes, and shapes of the annular portion 35, the end member 37, the rope insertion portion 45, and the rope attachment portion 46 are determined, the position of the end member tip portion 37b relative to the rope insertion portion outlet portion 45b is approximately determined. Then, the interval (space) between the end member tip portion 37b and the drum body outer peripheral portion 41a is approximately determined. At this time, the radius of curvature of the curved surface 51 is preferably set to the maximum (or approximately maximum) size that fits between the end member tip portion 37b and the drum body outer peripheral portion 41a.

[0037] The protrusion base end 53 is an end of the protrusion 50 on the rope attachment portion 46 side. The protrusion base end 53 is a portion in the vicinity of the boundary between the protrusion 50 and the end member facing portion 47. The protrusion base end 53 is preferably configured so as to suppress the stress applied to the protrusion base end 53. Specifically, the protrusion base end 53 is curved so as to smoothly connect the end member facing portion 47 and the protrusion 50. The protrusion base end 53 is, for example, arc-shaped or approximately arc-shaped when viewed from the drum axial direction Z. Since the protrusion base end 53 is curved, the concentration of stress at the protrusion base end 53 can be suppressed. Furthermore, since the protrusion base end 53 is curved, the thickness between the protrusion base end 53 and the drum barrel outer circumferential portion 41a can be secured, so that the stress can be suppressed. The protrusion base end 53 may or may not be in contact with the end member 37. The corner portion between the outer peripheral portion 37a of the terminal member and the tip portion 37b of the terminal member may or may not come into contact with the protrusion base end portion 53.

[0038] The protrusion boundary portion 55 is a portion that is a boundary between the protrusion portion 50 and the drum barrel outer periphery 41a. The protrusion boundary portion 55 is preferably configured to suppress bending of the rope 31, which comes into contact with the rope 31 when the rope 31 is wound around the drum barrel outer periphery 41a (see FIG. 3). Specifically, the protrusion boundary portion 55 has a curved surface shape that smoothly connects the drum barrel outer periphery 41a and the protrusion portion 50. When viewed from the drum axial direction Z, the protrusion boundary portion 55 is, for example, an arc shape or a substantially arc shape.

[0039] (Tensile test) A tensile load was applied to the rope 31 to examine the load (breaking load) at which the rope 31 broke, for a drum (not shown) without the protrusions 50 and a drum 40 with the protrusions 50 shown in Fig. 5. The portion D2 (the portion corresponding to the protrusions 50) on the outer side in the rope insertion orthogonal direction of the rope insertion portion outlet 45b of the drum without the protrusions 50 was chamfered (R-shaped) with a radius of 2 mm. The curved surface 51 of the protrusions 50 was curved (R-shaped) with a radius of 5 mm. The results are shown in Table 1 below.

[0040] [Table 1]

[0041] As shown in Table 1, the average breaking load for a drum (not shown) having no protrusions 50 and a chamfered shape with a radius of 2 mm was 15.2 kN. On the other hand, the average breaking load for drum 40 having protrusions 50 and a curved surface 51 with a radius of 5 mm was 17.1 kN. Furthermore, with this drum 40, rope 31 did not break even when a tensile load of 15 kN was continuously applied to rope 31 for three minutes. Note that the drum used in this test is merely one example, and the radius of curved surface 51 can be changed in various ways.

[0042] (Effects of the first invention) The effect of the fall prevention device 1 shown in FIG. 5 is as follows. The fall prevention device 1 includes a case 11, a drum 40, and a rope 31. The drum 40 is disposed inside the case 11 and is rotatable relative to the case 11. The rope 31 can be wound onto the drum 40, can be unwound from the drum 40, and is drawn out from the case 11. The drum 40 includes a drum body 41, a rope insertion portion 45, a rope attachment portion 46, and a protrusion 50. The drum body 41 can wind up the rope 31. As shown in FIG. 6, the rope insertion portion 45 is provided on the drum body 41. An end portion (rope end portion 31e) of the rope 31 is inserted into the rope insertion portion 45. The rope attachment portion 46 is a portion to which the rope end portion 31e inserted into the rope insertion portion 45 is attached. The rope attachment portion 46 is disposed at a position offset from the rotation axis (drum rotation axis 40a) of the drum 40 relative to the case 11. The protrusion portion 50 is provided on the rope insertion portion 45. The direction perpendicular to both the direction of the drum rotation axis 40a (drum axial direction Z) and the direction in which the rope insertion portion 45 extends (rope insertion direction E) is defined as the rope insertion orthogonal direction D. The drum radially outer side R2 in the rope insertion orthogonal direction D is defined as the rope insertion orthogonal direction outer side D2. The drum radially inner side R1 in the rope insertion orthogonal direction D is defined as the rope insertion orthogonal direction inner side D1.

[0043] [Configuration 1] The protrusion 50 is provided on the end of the rope insertion portion 45 on the side from which the rope 31 is pulled out (rope pull-out side A2), on the outer side D2 in the rope insertion orthogonal direction. The protrusion 50 has a curved surface 51. The curved surface 51 is curved convexly on the inner side D1 in the rope insertion orthogonal direction so as to support the rope 31 from the outer side D2 in the rope insertion orthogonal direction when the rope 31 is in a state in which it is pulled out to the fullest extent from the drum body portion 41 (pulled-out state).

[0044] According to the above [Configuration 1], the curved surface 51 can support the rope 31 in the pulled-out state from the outer side R2 in the drum radial direction so as to be aligned with the curved surface 51. Thus, the rope 31 can be gently bent to be aligned with the curved surface 51. Also, compared to a case where the curved surface 51 is not provided, the contact area of ​​the rope 31 with the drum 40 can be increased. Thus, the force acting on the rope 31 from the drum 40 can be dispersed. Therefore, breakage of the rope 31 when the rope 31 is in the most pulled-out state from the drum 40 can be more reliably suppressed.

[0045] (Effects of the second invention) The fall prevention device 1 includes an end member 37 attached to an end portion (rope end portion 31e) of the rope 31. The drum 40 includes an end member facing portion 47. The end member facing portion 47 is provided on the outer side R2 in the drum radial direction of the rope insertion portion 45, and is disposed so as to face the end member 37.

[0046] [Configuration 2] As shown in Fig. 7, protrusion height 50h is equal to or greater than end component thickness 37t. Protrusion height 50h is the height of protrusion 50 protruding from end component facing portion 47 in rope insertion orthogonal direction D. End component thickness 37t is the length in the radial direction of rope 31 from the outer circumferential surface of rope 31 to the outer surface of end component 37 (e.g., end component outer circumferential portion 37a).

[0047] The above [Configuration 2] can prevent the rope 31 from bending at the position (second region 31b) between the end member 37 and the protrusion 50. This allows the rope 31 to bend more reliably and more gently. This further prevents the rope 31 from breaking.

[0048] (Modification) The above embodiment may be modified in various ways. For example, the arrangement and shape of each component of the above embodiment may be changed. For example, the number of components may be changed, or some of the components may not be provided. For example, the components may be fixed or connected directly or indirectly to each other. For example, the arrangement of the components may be changed. For example, the inclusion relationship of the components may be changed in various ways. For example, a component described as a lower component included in a higher-level component may not be included in this higher-level component, but may be included in another component. For example, a component described as a plurality of different members or parts may be treated as a single member or part. For example, a component described as a single member or part may be provided separately as a plurality of different members or parts. For example, in the example shown in FIG. 6, the drum body outer periphery 41a and the protrusion 50 are integrally formed, but the drum body outer periphery 41a and the protrusion 50 may be separate bodies. For example, each component may have only a part of each feature (function, arrangement, shape, operation, etc.). [Explanation of symbols]

[0049] 1 Fall arrest device 11 Cases 31 Rope 31e Rope ends (rope ends) 37 End members 40 Dram 41 Drum body 45 Rope insertion part 45c rope attachment 47 End member facing part 50 Protrusion 51 Curved Surface D Rope insertion perpendicular direction D1 Rope insertion perpendicular direction inside D2 Rope insertion perpendicular direction outer side R1 Drum radial inner side R2 Outer diameter of drum

Claims

1. Case and a drum disposed within the case and rotatable relative to the case; a rope that can be wound onto the drum, can be unwound from the drum, and can be pulled out from the case; Equipped with The drum is A drum body portion on which the rope can be wound; A rope insertion portion provided on the drum body and into which an end portion of the rope is inserted; A rope attachment portion to which the end portion of the rope inserted into the rope insertion portion is attached and which is disposed at a position offset from the rotation axis of the drum relative to the case; A protrusion provided on the rope insertion portion; Equipped with A direction perpendicular to each of the direction of the rotation axis of the drum and the direction in which the rope insertion portion extends is defined as a rope insertion perpendicular direction, The outer side of the drum radial direction in the rope insertion orthogonal direction is the outer side of the rope insertion orthogonal direction, When the inner side of the drum radial direction in the rope insertion orthogonal direction is the inner side in the rope insertion orthogonal direction, The protrusion portion is provided on the outer side of the end portion of the rope insertion portion from which the rope is pulled out in the rope insertion orthogonal direction, The protrusion portion has a curved surface that is curved convexly toward the inside in the rope insertion orthogonal direction so as to support the rope from the outside in the rope insertion orthogonal direction when the rope is fully pulled out from the drum body portion. Fall arrest equipment.

2. 2. A fall arrest device according to claim 1, a terminal member attached to the end of the rope, The drum is provided with an end member opposing portion provided on the outer side of the rope insertion portion in the rope insertion orthogonal direction so as to face the end member, The height of the protrusion of the protrusion relative to the end member facing portion in the rope insertion orthogonal direction is equal to or greater than the length of the rope in the radial direction from the outer circumferential surface of the rope to the outer surface of the end member. Fall arrest equipment.

Images