Hook bar

Abstract

To improve a connection structure of a hook part of a hook bar.SOLUTION: A hook bar is composed of a body pipe 2 including a hook part 3 at a tip end and a grip part at a base end. The hook part 3 is integrally formed from a metal hook body and a resin connection component. The hook body includes a lock part 60 and a stem part extending in a length direction of the body pipe 2. The connection component is formed by insert molding around the stem part. The connection component is composed of an insertion part 70 having a circular shape in its cross section, and a cap part 71 having a diameter larger than that of the insertion part 70. A ring-shaped insertion groove is formed between an inner peripheral surface of an edge part 711 of the cap part 71 and a base end portion of an outer peripheral surface of the insertion part 70. The insertion part 70 of the connection component is inserted from a tip end 23 of the body pipe 2 into a hollow part 22. A circumferential wall of the body pipe 2 and the outer peripheral surface of the insertion part 70 are secured by swaging (at a swage part 25) with a tip portion of the body pipe 2 fitted in the insertion groove.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a hook rod for manually operating an opening / closing body (typically, a shutter curtain) that opens and closes an opening in a building. [Background technology]

[0002] In a manual shutter device, when pulling down a shutter curtain that is in a fully open position, a hook rod with a hook portion at the tip and a grip portion at the base end may be used (Patent Document 1). Conventional hook rods have room for improvement, as described below.

[0003] A hook rod 1' similar to the conventional hook rod disclosed in Patent Document 1 is shown in Figure 15. The grip portion 4' of the conventional hook rod 1' is fixed to the base end of the main pipe 2' with adhesive and rivets R, making it resistant to tensile and rotational strength. However, the method of fixing the grip portion 4' to the main pipe 2' with adhesive and rivets R is poor in productivity, and riveting the rod exposes the rivets R, resulting in poor design.

[0004] The hook portion 3' of the conventional hook rod 1' is fixed by crushing the tip end of the main pipe 2' and crimping it in one place to prevent rotation, and a protective rubber G is also attached, which results in poor productivity and design. However, such conventional fixing means is weak in the rotational direction, and there is a risk of the hook rod 1' rotating during use. [Patent Document 1] Patent No. 6978374 DISCLOSURE OF THE INVENTION [Problem to be solved by the invention]

[0005] SUMMARY OF THE INVENTION An object of the present invention is to improve the connecting structure of the hook portion of a hook bar. [Means for solving the problem]

[0006] The technical means adopted by the present invention to solve such problems are as follows: A hook rod consisting of a main pipe with a hook portion at the tip and a grip portion at the base end, The hook portion is integrally formed of a metal hook body and a resin connecting element, The hook body includes a hook portion and a shaft portion extending in the longitudinal direction of the main pipe, and the connecting element is insert-molded around the shaft portion, The connecting element includes an insertion portion having a circular cross section and a cap portion having a diameter larger than that of the insertion portion, and a ring-shaped insertion groove is formed between an inner peripheral surface of an edge of the cap portion and a base end portion of an outer peripheral surface of the insertion portion, The insertion portion of the connecting element is inserted into the hollow portion from the tip of the main pipe, and the peripheral wall of the main pipe and the outer peripheral surface of the insertion portion are fixed by caulking in a state where the tip portion of the main pipe is fitted into the insertion groove. It is a hook rod.

[0007] In one embodiment, the peripheral wall of the main pipe is fixed by caulking at a plurality of points in the circumferential direction of the peripheral wall.

[0008] In one embodiment, the peripheral wall of the main pipe is fixed by caulking at a plurality of locations in the length direction of the peripheral wall.

[0009] In one embodiment, a recessed groove extending in the circumferential direction is formed on the outer peripheral surface of the insertion portion in correspondence with the position where the insertion portion is fixed by caulking. [Effects of the Invention]

[0010] In the present invention, the hook portion is integrally formed (insert molded) from a metal hook body and a resin connecting element, thereby simplifying the connection structure between the main pipe and the hook portion, thereby improving productivity and design. [Brief explanation of the drawings]

[0011] [Figure 1]1A is a front view of the shutter device in a fully open position, showing the state in which the hook bar according to the present embodiment is suspended, and FIG. 1B is a plan view of the seat plate according to the present embodiment. [Figure 2] 1 is a diagram showing a hook bar according to the present embodiment. FIG. [Figure 3] 3A and 3B are diagrams illustrating the configuration of a hook portion of a hook rod according to the present embodiment. [Figure 4] 1A and 1B are diagrams showing the configuration of a grip portion of a hook bar according to the present embodiment. [Figure 5] FIG. 2 is a view showing a main body pipe of the hook bar according to the embodiment. [Figure 6] 1 is a diagram showing a hook portion of a hook rod according to the present embodiment. FIG. [Figure 7] 1 is a view showing a hook body of a hook rod according to an embodiment of the present invention; FIG. [Figure 8] 1 is a view showing a grip portion of a hook bar according to an embodiment of the present invention. FIG. [Figure 9] 10A and 10B are views showing the end cap of the hook bar according to the embodiment. [Figure 10] 1 is a view showing an end cap body of the end cap of the hook bar according to the embodiment; FIG. [Figure 11] 10A and 10B are views showing a clip portion of an end cap of the hook bar according to the embodiment. [Figure 12] FIG. 10 is a diagram showing the state in which the hook bar according to the present embodiment is gripped. [Figure 13] 10 is a diagram showing the movement of pulling down the seat plate using the hook rod (first position) according to the present embodiment. FIG. [Figure 14] 10 is a diagram showing the movement of pulling down the seat plate using the hook rod (second position) according to the present embodiment. FIG. [Figure 15] FIG. 1 is a diagram showing a conventional hook bar.

[0012] [A] Overview 1(A) is a front view showing a manual shutter device (in a substantially fully open position) as an example of an opening / closing body for opening and closing an opening in a building. The manual shutter device is equipped with a shutter curtain 10 that opens and closes the opening in a building, and both widthwise ends of the shutter curtain 10 are guided up and down by grooves in left and right guide rails 11 that are erected at both widthwise ends of the opening in the building, thereby opening and closing the opening in the building.

[0013] The upper end of the shutter curtain 10 is connected to a winding shaft (not shown) provided in a shutter case 12 arranged above the building opening, and the shutter curtain 10 rises and falls as the winding shaft rotates forward and backward to open and close the building opening. The winding shaft is urged by a balance spring in the direction of winding up the shutter curtain 10, and when a force to lower the shutter curtain 10 acts on the shutter curtain 10 in the fully open position to start the descent, the shutter curtain 10 descends under its own weight and hits the floor to reach the fully closed position, and when a force to lift the shutter curtain 10 acts on the shutter curtain 10 in the fully closed position to start the ascent, the shutter curtain 10 rises while being wound up by the urging force of the balance spring to reach the fully open position.

[0014] When the shutter curtain 10 is wound up on the winding shaft and in the fully open position, the seat plate 13 at the bottom of the shutter curtain 10 is located close to the ceiling, so for a typical opening height, the seat plate 13 of the shutter curtain is located at a height that is out of reach. Figure 1(B) is a plan view of the seat plate 13 according to this embodiment, and a hole 131 consisting of an elongated hole is formed in the center of the width direction of the horizontal flat part 130 of the seat plate 13. When the shutter curtain 10 is wound up on the winding shaft and in the fully open position, the hook rod 1 is inserted through the hole 131 in the flat part 130 of the seat plate 13 at the bottom end and hooked onto the flat part 130, and the shutter curtain 10 is pulled down using the hook rod 1 to the fully closed position (Figures 13 and 14).

[0015] As shown in Figure 2, the hook rod 1 of this embodiment comprises a main pipe 2 of a predetermined length, a hook portion 3 provided at the tip of the main pipe 2, a grip portion 4 provided at the base end of the main pipe 2, and an end cap 5 provided at the end of the grip portion 4.

[0016] As shown in Figure 5, the main pipe 2 is a cylindrical element, the peripheral wall of which has an outer peripheral surface 20 and an inner peripheral surface 21, with the inside of the peripheral wall (inner peripheral surface 21) forming a hollow portion 22. One end of the main pipe 2 in the length direction is the tip end 23, and the other end is the base end 24. The main pipe 2 according to this embodiment is a metallic cylindrical pipe with a coating made of vinyl chloride formed on the outer surface thereof, and the outer peripheral surface 20 is also made of vinyl chloride.

[0017] [B] Hook part As shown in FIG. 6, the hook portion 3 is integrally formed from a metal hook body 6 and a resin connecting element 7. As shown in FIG. 7, the hook body 6 comprises a hooking portion 60, a shaft portion 61 extending perpendicular to the hooking portion 60, an inclined portion 62 located between the shaft portion 61 and the hooking portion 60, and a curved portion 63. The inclined portion 62 extends from the shaft portion 61 at an angle relative to the length of the shaft portion 61, and the curved portion 63 connects the base end of the hooking portion 60 (the side opposite the tip 600) to the inclined portion 62. The angle formed by the hooking portion 60 and the inclined portion 62 is an acute angle less than 90 degrees. The shaft portion 61 is integrally formed from a cylindrical portion 610 on the inclined portion 62 side (the upper end side in FIGS. 6 and 7) and a wide portion 611 having a rectangular cross-sectional shape on the side farther from the inclined portion 62 (the lower end side in FIGS. 6 and 7).

[0018] The hook portion 3 according to this embodiment is integrally formed by insert-molding a connecting element 7 onto the shank 61 of the hook body 6, and the connecting element 7 is integrally formed around the shank 61. As shown in Fig. 6, the connecting element 7 is composed of a cylindrical insertion portion 70 that is circular in cross section and provided around the shank 61, and a cap portion 71 that is integrally formed at the base end of the insertion portion 70 (i.e., the side closer to the inclined portion 62, the upper end in Fig. 7) and has a larger diameter than the insertion portion 70.

[0019] The outer diameter of the insertion portion 70 of the connecting element 7 is slightly smaller than the inner diameter of the main pipe 2, allowing it to be inserted into the hollow portion 22 from the tip 23 of the main pipe 2. A groove 72 extending in the circumferential direction is formed on the outer peripheral surface of the insertion portion 70. In this embodiment, a groove set consisting of four arc-shaped grooves 72 is formed at intervals in the circumferential direction. In this embodiment, two rows of groove sets (four arc-shaped grooves 72) are formed at intervals in the longitudinal direction of the insertion portion 70. Specifically, the grooves 72 in this embodiment are composed of four arc-shaped first grooves 72A formed in the circumferential direction at a first position in the longitudinal direction of the insertion portion 70 and four arc-shaped second grooves 72B formed in the circumferential direction at a second position in the longitudinal direction of the insertion portion 70.

[0020] The cap portion 71 is fixed to the periphery of the shaft portion 61 (the side closer to the inclined portion 62) and comprises an upper end surface 710 that is circular in plan view and a circular rim portion 711. The inner diameter of the rim portion 711 of the cap portion 71 is slightly larger than the outer diameter of the main pipe 2. The tip of the cylindrical insertion portion 70 is integrally connected to the back surface of the upper end surface 710, and the inner circumferential surface of the rim portion 711 of the cap portion 71 faces the outer circumferential surface of the insertion portion 70 at a distance, and a ring-shaped insertion groove 73 is formed between the inner circumferential surface of the rim portion 711 and the outer circumferential surface of the insertion portion 70. The ring-shaped insertion groove 73 corresponds to the cross-sectional shape of the main pipe 2, allowing the tip portion of the main pipe 2 to be inserted into it.

[0021] As shown in Figure 3, the connecting element 7 of the hook portion 3 is inserted into the tip portion of the hollow portion 22 of the main pipe 2, the tip portion of the main pipe 2 is inserted into the insertion groove 73 of the cap portion 71 of the connecting element 7 of the hook portion 3, and the tip 23 of the main pipe 2 abuts against the back surface of the upper end surface 710 of the cap portion 71.

[0022] 2 and 3, the outer peripheral surface of the insertion portion 70 of the connecting element 7 overlaps the inner surface (inner peripheral surface 21) of the peripheral wall of the main pipe 2; that is, the outer peripheral surface of the insertion portion 70 of the connecting element 7 of the hook portion 3 is close to the inner peripheral surface 21 of the main pipe 2, and the peripheral wall of the main pipe 2 is positioned in the recessed groove 72 of the insertion portion 70 and plastically deformed into a concave shape (i.e., crimped) to form crimped portions 25, thereby connecting the insertion portion 70 of the hook portion 3 to the tip portion of the main pipe 2. In this embodiment, the crimped portions 25 are arc-shaped crimped portions 25 formed at four locations circumferentially on the peripheral wall of the main pipe 2. In this embodiment, the crimped portions 25 are formed in two rows in the longitudinal direction of the main pipe 2.

[0023] More specifically, the crimping portions 25 include a plurality of arc-shaped first crimping portions 25A formed in the circumferential direction at a first position in the longitudinal direction of the peripheral wall of the main pipe 2, and a plurality of arc-shaped second crimping portions 25B formed in the circumferential direction at a second position in the longitudinal direction of the peripheral wall of the main pipe 2. The crimping portions 25 are formed in two rows (double layers) in the longitudinal direction of the main pipe 2 to prevent the main pipe 2 from slipping out in the longitudinal direction (to counteract the force acting on the hook rod 1 when the seat plate 13 of the shutter curtain 1 is pulled downward), and the four arc-shaped crimping portions 25 are formed independently in the circumferential direction to restrict circumferential rotation. Note that a plurality of third crimping portions may be formed in the circumferential direction at a third position in the longitudinal direction of the peripheral wall of the main pipe 2.

[0024] [Appendix 1] A hook rod (1) is made up of a main pipe (2) having a hook portion (3) at the tip and a grip portion (4) at the base end. The hook portion 3 is integrally formed from a metal hook body 6 and a resin connecting element 7. The hook body 6 includes a hooking portion 60 and a shaft portion 61 extending in the longitudinal direction of the main pipe 2, and the connecting element 7 is insert-molded around the shaft portion 61. The connecting element 7 comprises an insertion portion 70 having a circular cross section and a cap portion 71 having a larger diameter than the insertion portion 70, and a ring-shaped insertion groove 73 is formed between the inner peripheral surface of an edge portion 711 of the cap portion 71 and the base end portion of the outer peripheral surface of the insertion portion 70. The insertion portion 70 of the connecting element 7 is inserted into the hollow portion 22 from the tip 23 of the main pipe 2, and with the tip portion of the main pipe 2 fitted into the insertion groove 73, the peripheral wall of the main pipe 2 and the outer surface of the insertion portion 70 are fixed by crimping (crimping portion 25). The peripheral wall of the main pipe 2 in this embodiment has crimped portions 25 formed at multiple locations around the circumferential direction of the peripheral wall, and further has crimped portions 25A and 25B formed at multiple locations along the length of the peripheral wall. The outer peripheral surface of the insertion portion 70 of the connecting element 7 according to this embodiment is formed with circumferentially extending recessed grooves 72 (72A, 72B) corresponding to the portions where the crimped portions 25 (25A, 25B) are formed.

[0025] [Appendix 2] A hook rod (1) is made up of a main pipe (2) having a hook portion (3) at the tip and a grip portion (4) at the base end. The hook portion 3 includes a hooking portion 60 and a shaft portion (insertion portion 70) that is circular in cross section and extends in the longitudinal direction of the main pipe 2. When the shaft portion (insertion portion 70) is inserted into the hollow portion 22 from the tip 23 of the main pipe 2, the inner surface 21 of the peripheral wall of the main pipe 2 and the outer surface of the shaft portion (insertion portion 70) are close to each other, and the peripheral wall of the main pipe 2 and the shaft portion (insertion portion 70) are fixed by multiple arc-shaped crimping portions 25 extending circumferentially of the peripheral wall. In this embodiment, the hook portion 60 is made of metal, and the shaft portion (insertion portion 70) is made of resin. The crimping portion 25 in this embodiment comprises a plurality of first crimping portions 25A formed circumferentially at a first position in the longitudinal direction of the peripheral wall of the main pipe 2, and a plurality of second crimping portions 25B formed circumferentially at a second position in the longitudinal direction of the peripheral wall of the main pipe 2. It is also possible to provide a plurality of third crimped portions formed in the circumferential direction at third positions in the length direction of the peripheral wall of the main pipe 2. The shaft portion (insertion portion 70) according to this embodiment has an outer peripheral surface formed with circumferentially extending recessed grooves 72 (72A, 72B) corresponding to the portions where the crimped portions 25 (25A, 25B) are formed.

[0026] [C] Grip As shown in Figure 8, the grip part 4 is a cylindrical element made of resin, and its peripheral wall has an outer peripheral surface 40 and an inner peripheral surface 41, with a hollow part 42 inside the inner peripheral surface 41. The inner diameter of the peripheral wall of the grip part 4 is slightly larger than the outer diameter of the main pipe 2, so that the base end portion of the main pipe 2 can be inserted from the tip of the hollow part 42. At the base end side of the hollow part 42 of the grip part 4, the inner peripheral surface 41 is reduced in diameter to form a step, and a ring-shaped abutment part 43 is formed from this step. The ring-shaped abutment part 43 corresponds to the cross-sectional shape of the main pipe 2, so that the base end 24 of the main pipe 2 abuts against the abutment part 43.

[0027] A thumb rest 44 extending in the longitudinal direction is formed at a predetermined circumferential position on the outer peripheral surface 40 of the peripheral wall of the grip part 4. As shown in Fig. 12, when the hook bar 1 is gripped by the grip part 4 with the thumb rest 44 facing upward, the hook bar 1 assumes a position in which the hook part 60 at the tip faces upward (i.e., the tip 600 of the hook part 60 faces upward). In other words, the thumb rest 44 is formed at a position on the outer peripheral surface 40 of the peripheral wall of the grip part 4 such that the tip 600 of the hook part 60 faces upward when the thumb rest 44 faces upward.

[0028] In this embodiment, thumb rest 44 is a flat surface (with multiple grooves or unevenness for preventing slippage) formed on outer peripheral surface 40 of the peripheral wall of grip portion 4, but the configuration of thumb rest 44 is not limited as long as the area where the thumb is placed is indicated and visible to the operator. For example, thumb rest 44 may be a mark that identifiably indicates a predetermined area on outer peripheral surface 40, and examples of such marks include those that are identifiably indicated by color and / or pattern, or those that are identifiably indicated by surface shape.

[0029] The outer diameter of the grip portion 4 according to this embodiment is slightly increased toward the base end in the base end region (the base end side of the thumb rest portion 44 in the illustrated embodiment), making the base end side of the grip portion 4 thicker and less likely to slip off when gripped. The end face on the base end side of the grip portion 4 is a ring-shaped abutment surface 45, and the base end region of the grip portion 4 is further provided with a circular raised piece 46 protruding from it, positioned inside the ring-shaped abutment surface 45, and a fitting groove 47 is formed in the raised piece 46 so as to face the protruding portion.

[0030] As shown in Figures 9 and 10, the end cap 5 is made of resin and comprises a cap body 8 and a clip portion 9. As shown in Figure 10, the cap body 8 comprises a substantially hemispherical head 80 and a cylindrical or columnar shank 81 with an outer circumferential surface. The outer diameter of the shank 81 is slightly smaller than the inner diameter of the peripheral wall of the main pipe 2, allowing it to be inserted into the hollow portion 22 from the base end 24 of the main pipe 2. The end surface of the hemispherical head 80 of the end cap 5 forms a ring-shaped abutment portion 83, and the head 80 further comprises a pair of fitting pieces 84 extending radially from the abutment portion 83.

[0031] 10, a clip attachment surface 82 having an arc-shaped cross section is formed by slightly reducing the diameter of predetermined portions (predetermined portions in the longitudinal and circumferential directions) of the outer peripheral surface of the shaft portion 81 of the cap body 8. Stepped abutment portions 820 are formed between the clip attachment surface 82 and the outer peripheral surface of the shaft portion 81 at both circumferential ends, and stepped abutment portions 821 are formed between the clip attachment surface 82 and the outer peripheral surface of the shaft portion 81 at both longitudinal ends.

[0032] 11, the clip portion 9 is made of metal (stainless steel) and includes a cylindrical mounting portion 90 that is arc-shaped in cross section. Sloped locking claws 91A, 91B are formed by cutting out and raising a plurality of predetermined portions on the outer circumferential surface of the mounting portion 90. The locking claws 91A, 91B according to this embodiment have a pair of tips 910 formed by cutting out the tip of a plate piece in the shape of an isosceles triangle. The pair of tips 910 of each of the locking claws 91A, 91B are configured to engage with and lock onto the inner circumferential surface 21 of the main pipe 2.

[0033] The longitudinal and circumferential dimensions of the attachment portion 90 of the clip portion 9 substantially match the longitudinal and circumferential dimensions of a clip attachment surface 82 formed on the outer peripheral surface of the shaft portion 81 of the cap body 8, and the clip portion 9 is attached to the outer peripheral surface of the shaft portion 81 of the cap body 8 by fitting the attachment portion 90 onto the clip attachment surface 82 of the shaft portion 81. Circumferential ends 900 of the arc-shaped attachment portion 90 abut against abutment portions 820 at both circumferential ends of the clip attachment surface 82, restricting circumferential rotation of the clip portion 9 relative to the shaft portion 81 of the end cap 5. Longitudinal ends 901 of the arc-shaped attachment portion 90 abut against abutment portions 821 at both longitudinal ends of the clip attachment surface 82, restricting longitudinal movement of the clip portion 9 relative to the shaft portion 81 of the end cap 5.

[0034] The locking claws 91A, 91B are formed to rise at an angle from the outer circumferential surface of the shaft portion 81 toward the base end 24 of the main pipe 2. The locking claws 91A, 91B are designed to elastically deform so as to be crushed in the insertion direction of the shaft portion 81, and when the shaft portion 81 is inserted into the hollow portion 22, the locking claws 91A, 91B do not provide resistance, allowing the shaft portion 81 to move in the insertion direction.

[0035] As shown in FIGS. 9 and 11, in this embodiment, three locking claws 91A are provided at a first axial position on the shaft portion 81, spaced apart in the circumferential direction, and three locking claws 91B are provided at a second axial position on the shaft portion 81, spaced apart in the circumferential direction. The locking claws 91A and 91B in this embodiment are formed at offset positions in the circumferential direction. That is, the locking claws 91A and 91B do not coincide in the axial direction. Specifically, as shown in FIG. 11, an axis P1 passing through the center of the locking claws 91A is offset from an axis P2 passing through the center of the locking claws 91B. The axes P1 and P2 coincide with the insertion direction of the end cap 5.

[0036] The base end portion of the main pipe 2 is inserted into the hollow portion 42 of the grip portion 4, and the base end of the main pipe 2 is brought into contact with the ring-shaped contact portion 43. In this state (with the base end of the main pipe 2 in contact with the contact portion 43), the relationship between the main pipe 2 and the grip portion 4 restricts movement of the main pipe 2 toward the base end of the grip portion 4 (Fig. 4).

[0037] The shaft 81 of the end cap 5 is inserted from the base end of the grip portion 4 into the base end portion of the hollow portion 22 of the main pipe 2 (see Figure 4). At this time, a pair of fitting pieces 84 of the head portion 80 of the end cap 5 is inserted into a pair of fitting grooves 47 formed in the rising piece 46 protruding from the base end of the grip portion 4, and the ring-shaped contact portion 83 of the head portion 80 comes into contact with the ring-shaped contact surface 45 at the base end of the grip portion 4, thereby determining the fixed position of the end cap 5.

[0038] The mating piece 84 of the end cap 5 and the mating groove 47 of the grip portion 4 extend in the insertion direction of the end cap 5, and when the shaft portion 81 of the end cap 5 is inserted, the mating piece 84 of the end cap 5 fits into the mating groove 47 of the grip portion 4, thereby restricting the circumferential movement between the main pipe 2 and the end cap 5.

[0039] When the shaft 81 of the end cap 5 is inserted from the base end 24 of the main pipe 2 into the hollow portion 22, the inclined locking claws 91A, 91B on the outer peripheral surface of the shaft 81 come into contact with the inner peripheral surface 21 of the main pipe 2 and are crushed, and the tips 910 of the inclined locking claws 91A, 91B are locked onto the inner peripheral surface 21 of the main pipe 2. In this state, the locking claws 91A, 91B bite into the inner peripheral surface 21 of the main pipe 2, restricting movement in the direction opposite to the insertion direction (the removal direction). When the operator grasps the grip portion 4, movement of the main pipe 2 toward the tip side (relative to the grip portion 4) is restricted, and the operator can resist the pulling force acting on the main pipe 2 of the hook rod 1 when the latching portion 60 at the tip of the hook rod 1 is hooked onto the seat plate 13 to lower the shutter curtain 1.

[0040] 11, in this embodiment, locking claws 91A and 91B are formed offset in the circumferential direction of shaft portion 81, and are therefore able to resist a greater pulling force than when locking claws 91A and 91B are formed aligned in the circumferential direction of shaft portion 81 (note that the present invention does not exclude this configuration, and it should be noted that the arrangement of locking claws 91A and 91B is not limited). If locking claws 91A and 91B are formed aligned in the circumferential direction of shaft portion 81, when main pipe 2 moves in the direction of removal, locking claw 91A moves along the movement path of locking claw 91B (a scratch-like movement path is formed on inner circumferential surface 21 of main pipe 2), and this could reduce the force resisting the pulling force.

[0041] [Appendix 3] a main pipe 2 having a hook portion 3 formed at the tip; a grip portion 4 having a hollow portion 42 for receiving the base end side of the main pipe 2; an end cap 5 attached to the base end of the grip portion 4; It consists of An abutment portion 43 is formed on the base end side of the inner circumferential surface of the hollow portion 42 of the grip portion 4. The end cap (5) has a head (80) and a shaft (81), and the shaft (81) has a fixing means (clip portion (9)) for fixing to the inner circumferential surface (21) of the main pipe (2). With the base end 24 of the main pipe 2 inserted from the tip of the grip portion 4 into the hollow portion 22 abutting against the abutment portion 43, the shaft portion 81 of the end cap 5 is inserted from the base end of the grip portion 4 into the hollow portion 22 of the main pipe 2, and the head portion 80 abuts against the base end of the grip portion 4, and the shaft portion 81 and the inner surface 21 of the main pipe 2 are fixed by a fixing means (clip portion 9). The fixing means according to this embodiment is made up of a plurality of locking claws 91A, 91B formed on the outer circumferential surface of the shaft portion 81. The locking claws 91A and 91B elastically deform to allow movement of the shaft portion 81 in the insertion direction, and by engaging with the inner surface 21 of the main pipe 2, movement in the direction of detachment from the hollow portion 22 of the main pipe 2 is restricted. The fixing means may be a female screw formed on the inner peripheral surface 21 and a male screw formed on the outer peripheral surface of the shaft portion 8. In this embodiment, a fitting groove 47 is formed at the base end of the grip portion 4, and a fitting piece 84 is formed on the end face of the head portion 80 of the end cap 5. When the abutment portion 83 of the end cap 5 abuts against the abutment surface 45 at the base end of the grip portion 4, the mating groove 47 and the mating piece 84 engage with each other, thereby restricting the circumferential movement of the grip portion 4 and the head portion 80 relative to each other.

[0042] [Appendix 4] a main pipe 2 having a hook portion 3 formed at the tip; a grip portion 4 having a hollow portion 42 for receiving the base end side of the main pipe 2; an end cap 5 attached to the base end of the grip portion 4; It consists of The end cap 5 comprises a head 80, a shaft 81 inserted into the hollow portion 22 of the main pipe 2, and a metal clip 9 attached to the outer circumferential surface of the shaft 81. The clip 9 comprises a cylindrical mounting portion 90 and a plurality of locking claws 91A, 91B formed on the outer circumferential surface of the mounting portion 90. The locking claws 91A, 91B are elastically deformed so as to be crushed, thereby allowing movement of the shaft portion 81 in the insertion direction, while the tips 910 of the locking claws 91A, 91B bite into the inner surface 21 of the main pipe 2, thereby restricting movement in the direction away from the hollow portion 22 of the main pipe 2. A plurality of locking claws 91A, 91B according to this embodiment are formed at intervals in the circumferential direction of the mounting portion 90. The locking claws 91A, 91B according to this embodiment are composed of a plurality of first locking claws 91A formed in the circumferential direction at a first position in the axial direction of the mounting portion 90, and a plurality of second locking claws 91B formed in the circumferential direction at a second position in the axial direction of the mounting portion 90, The first locking claws 91A and the second locking claws 91B are formed at different positions in the circumferential direction. The end cap 5 according to this embodiment has a recess 82 formed on the outer peripheral surface of the shaft portion 81, which has an arc-shaped cross section. Step-like first contact portions 820 are formed between both circumferential ends of the recess 82 and the outer peripheral surface of the shaft portion 81, and step-like second contact portions 821 are formed between both longitudinal ends of the recess 82 and the outer peripheral surface of the shaft portion 81, The mounting portion 90 is mounted in the recess 82, with a circumferential end 900 of the mounting portion 90 abutting against the first abutment portion 820 and a longitudinal end 901 of the mounting portion 90 abutting against the second abutment portion 821.

[0043] [D] Support for holding the hook rod How the hook rod 1 is hooked to the seat plate 13 at the bottom end of the shutter curtain 10 may vary depending on the operator. Specifically, there are two ways to operate the hook rod 1: with the grip portion 4 of the hook rod 1 held in place and the hook portion 60 facing upward (Fig. 13), and with the grip portion 4 of the hook rod 1 held in place and the hook portion 60 facing downward (Fig. 14).

[0044] Here, if the hook rod 1 is inserted into the hole 131 of the seat plate 13 and hooked, and the hook portion 60 of the hook part 3 is not facing upward, the hook portion 60 will be difficult to remove from the hole 131 of the seat plate 13 while the shutter curtain is closed, which may take a long time to close and cause stress for the operator. If the hook portion 60 does not come out of the hole 131 of the seat plate 13 and the shutter curtain 10 continues to descend, there is also a risk that the hook rod 1 will collide with the floor.

[0045] To explain this in more detail with reference to Figure 14, when the grip portion 4 of the hook rod 1 is grasped and the hook portion 60 is hooked onto the flat portion 130 through the hole 131 in the seat plate 13 with the hook portion 60 facing downward, as the shutter curtain 1 (seat plate 13) descends the angle of the hook rod 1 becomes nearly horizontal (the tip 600 of the hook portion 60 moves downward), and to release the hooked state it is necessary to move the tip 600 of the hook portion 60 so as to lift it up, but it is difficult to perform an operation such as lifting the tip 600 of the hook portion 60 against the descending seat plate 13. Meanwhile, the fact that the hook portion 60 of the hook rod 1 is difficult to remove from the hole 131 in the seat plate 13 unless the tip 600 of the hook portion 60 of the hook portion 3 faces upward is not recognized by the end user who is the operator.

[0046] In this embodiment, a thumb rest 44 is formed at a predetermined location on the grip portion 4 of the hook rod 1, and the position of the thumb rest 44 is determined so that when an operator grasps the grip portion 4 by placing their thumb on the thumb rest 44, the hook portion 60 of the hook portion 3 at the tip is oriented so as to face upward (FIG. 12). As shown in FIG. 12, when the grip portion 4 is grasped with the hook portion 60 of the hook portion 3 facing upward and the operator attempts to insert the hook portion 60 into the hole 131 of the seat panel 13 to latch it, the operation is forcibly performed with the tip 600 of the hook portion 60 facing upward (FIG. 13), and the hook portion 60 does not have difficulty in coming out of the hole 131 just before the shutter curtain 10 is fully closed, allowing for a smooth closing operation.

[0047] To explain in more detail with reference to Figure 13, when the grip portion 4 of the hook rod 1 is grasped and the hanging portion 60 is hooked from the hole 131 of the seat plate 13 to the flat portion 130 with the hanging portion 60 facing upward, as the shutter curtain 1 (seat plate 13) descends the angle of the hook rod 1 becomes close to horizontal (the tip 600 of the hanging portion 60 moves in the downward direction), and in order to release the hooked state, it is necessary to move the tip 600 of the hanging portion 60 downward, but the operation of lowering the tip 600 of the hanging portion 60 relative to the descending seat plate 13 can be performed smoothly.

[0048] [Appendix 5] The device has a rod-shaped portion (main pipe 2) with a hook portion 3 formed at the tip and a grip portion 4 formed at the base end. The hook portion 3 has a hook portion 60 extending substantially perpendicular to the longitudinal direction of the rod-shaped portion (main pipe 2), The grip portion 4 has a visible thumb rest portion 44, The thumb rest 44 is formed at a position such that the tip 600 of the hook 60 faces upward when the thumb rest 44 faces upward. The thumb rest portion 44 according to this embodiment is a flat portion formed on the outer surface of the grip portion 4 and extending in the length direction of the grip portion 4. The thumb rest 44 may be formed from a recess instead of the flat portion. [Explanation of symbols]

[0049] 1 hook rod 2 Main pipe 25 Crimping part 3 Hook part 4 Grip section 5 End Cap 6 Hook body 60 Latch part 7 Connected Components 8 Cap body 9 Clip part 91A Locking claw 91B Locking claw

Claims

1. A hook rod consisting of a main pipe with a hook portion at the tip and a grip portion at the base end, The hook portion is integrally formed of a metal hook body and a resin connecting element, The hook body includes a hook portion and a shaft portion extending in the longitudinal direction of the main pipe, and the connecting element is insert-molded around the shaft portion, The connecting element includes an insertion portion having a circular cross section and a cap portion having a diameter larger than that of the insertion portion, and a ring-shaped insertion groove is formed between an inner peripheral surface of an edge of the cap portion and a base end portion of an outer peripheral surface of the insertion portion, The insertion portion of the connecting element is inserted into the hollow portion from the tip of the main pipe, and the peripheral wall of the main pipe and the outer peripheral surface of the insertion portion are fixed by caulking in a state where the tip portion of the main pipe is fitted into the insertion groove. Hook rod.

2. The peripheral wall of the main pipe is fixed by caulking at a plurality of points in the circumferential direction of the peripheral wall.

2. The hook bar of claim 1.

3. The peripheral wall of the main pipe is fixed by caulking at a plurality of points in the length direction of the peripheral wall. A hook bar according to claim 1 or 2.

4. A recessed groove extending in the circumferential direction is formed on the outer peripheral surface of the insertion portion in correspondence with the position where the insertion portion is fixed by caulking. The hook bar according to any one of claims 1 to 3.

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