JP2010178865A - Skipping rope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a skipping rope capable of facilitating fast turning thereof during skipping. <P>SOLUTION: A coil spring 30 comprises a cylindrical part 31 and a truncated cone like spreading part 32. The cylindrical part 31 is projected from the first opening 22 of an almost cylindrical handle 20, and the spreading part 32 is tightly held with a stopper surface 23 of the inner peripheral surface 21 of the handle 20 and the tapered pressure surface 41 of a spring stopper 40, which allows the axis center C of the spring 30 to be identical with the axis center C of the handle 20 with a high degree of accuracy so that the spring 30 could be positioned and fixed. The spreading part 32 is fixed and never unnecessarily rotates though the distal end 31b is bent around the base end 31a of the cylindrical part 31 when the rope is turned, which allows a resilience of the spring 30 by the flexion to effectively facilitate the turning of the rope. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a jump rope in which handles held by palms are attached to both ends of a string, and more particularly to a jump rope in which a coil spring is provided at a connecting portion between both ends of the string and the handle.

  In rope jumping with handles attached to both ends of the string, that is, one end and the other end, a spring is known in the vicinity of the connecting part between the end of the string and the handle (for example, Patent Document 1).

  This handle is provided with a shelf on the side of the handle connected to the string, and a rod-shaped spring with a stopper formed on the base end side is passed through this shelf so that the tip side protrudes outward, and this protrusion is The end of the string is connected to the leading end.

According to this skipping rope, when the string is rotated by grasping the handle, the rod-shaped spring is bent, and the rotational force is increased by the restoring force.
Japanese Utility Model Publication No. 63-189267

  However, according to the skipping rope described above, the rod-shaped spring that penetrates the shelf rotates freely with respect to the shelf, so that when the string is rotated and the spring is bent, its restoring force is reduced. There is a problem that the rotation of the string cannot be sufficiently promoted because a part of the spring rotates the spring itself.

  Therefore, the present invention can promote the rotation of the string, for example, can easily perform double jumping, is difficult to come out even if the string rotates at a high speed, and can easily adjust the length of the rope. The purpose is to provide skipping rope.

  The invention according to claim 1 relates to a jump rope comprising a long string and two handle units respectively attached to both ends of the string. In the jump rope according to the present invention, the handle unit is formed in a substantially cylindrical shape extending from the proximal end side toward the distal end side to which the end portion of the string is attached along the axial center, and the above-mentioned on the axial center. A handle having a first opening formed at the tip, a stopper surface having an inner diameter continuous with the first opening and a diameter increasing toward the base end, and protruding from the first opening. A coil spring having a cylindrical portion that is continuous with a base end side of the cylindrical portion and is formed to follow the stopper surface and is in contact with the stopper surface; and an inner surface of the expanding portion. A locking surface that is formed by copying and is inserted into the expansion portion and holds the expansion portion between the stopper surface and the end portion of the string that passes through the axis of the spring. A spring retainer having a portion, Obtain, characterized in that.

  According to a second aspect of the present invention, in the jump rope according to the first aspect, the stopper surface, the expanding portion, and the pressing surface are formed in a truncated cone shape.

  The invention according to claim 3 is the jump rope according to claim 1 or 2, wherein the spring retainer is formed on the tip side, and the end of the string passes through the axis, And a holding portion that is formed on the base end side and that holds the end portion of the cord passing through the through hole in a folded state to prevent the end portion of the cord from coming off.

  According to a fourth aspect of the present invention, in the jump rope according to the third aspect of the present invention, the jumping rope has a string stopper that is bent and held by the holding section in a bent state.

  According to a fifth aspect of the present invention, in the jump rope according to the fourth aspect, the string stopper has two through holes adjacent to each other and having substantially the same size as the diameter of the string. The end portion of the string is bent by continuously inserting the end portion into one through hole and the other through hole.

  The invention according to claim 6 is the jump rope according to any one of claims 1 to 5, wherein the handle has a second opening at a base end that allows passage of the spring and the spring retainer. It is characterized by that.

  According to a seventh aspect of the present invention, in the jump rope according to the sixth aspect, the spring retainer has a cylindrical portion on the proximal end side of the pressing surface, and the cylindrical portion has a plurality of outer peripheral surfaces in the circumferential direction, etc. It has an axial rib that protrudes from each of the positions to be divided and extends along the axial direction and contacts the inner peripheral surface of the handle.

  According to the invention of claim 1, for example, when the user grasps one handle with the left palm and grasps the other handle with the right palm to rotate the string, the rotation causes the spring to open the first opening of the handle. It is curved in the vicinity of the portion, and the restoring force accompanying the elastic force of the spring acts in the rotational direction. For this reason, rotation is facilitated by the spring, and rotation is performed smoothly. Therefore, for example, high-speed rope jumping such as double jumping and triple jumping can be easily performed. At this time, the expanded portion of the spring is sandwiched between the stopper surface of the handle and the pressing surface of the spring presser, so that the expanded portion is positioned and fixed with high accuracy with a wide inclined area and with reference to the shaft center. Thus, unnecessary rotation can be prevented, so that the restoring force when the string is rotated and the spring is bent can be effectively applied in the rotation direction without waste. Moreover, since the end part of the string is fixed by the locking part of the spring presser, it is possible to prevent the string from coming off even when the string rotates faster.

  According to the invention of claim 2, since the stopper surface, the expanding portion, and the pressing surface are formed in a truncated cone shape, the shape is simple and the manufacture is easy.

  According to invention of Claim 3, it can prevent effectively that the edge part of a string remove | deviates from a spring press by a holding | maintenance part.

  According to the invention of claim 4, by using the string removal portion, the string can be more reliably prevented from coming off.

  According to the invention of claim 5, the string retainer can reliably prevent the string from being removed by a simple operation in which the ends of the string are inserted into the two through holes and can be engaged with the holding portion. Can do.

  According to the sixth aspect of the present invention, the spring and the spring retainer can be inserted / removed through the second opening at the base end of the handle, so that assembly and string length adjustment are facilitated.

  According to the invention of claim 7, since the spring retainer has the axial rib that contacts the inner peripheral surface of the handle, it is easier to insert into and remove from the inside of the handle, and when inserted into the inside of the handle. The spring retainer can be positioned on the shaft center with high accuracy. Therefore, the spring positioned and fixed by the spring presser is also positioned and fixed on the shaft center with high accuracy.

Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. In addition, in each drawing, the member etc. which attached | subjected the same code | symbol are the same structures, The duplication description about these shall be abbreviate | omitted suitably. Moreover, in each drawing, members and the like that are not necessary for the description are omitted as appropriate.
<Embodiment 1>

  With reference to FIGS. 1-11, the jumping rope 1 of Embodiment 1 is demonstrated as an example of the jumping rope which concerns on this invention.

  Here, FIG. 1 is an exploded perspective view of the handle unit H including the handle 20, the spring (coil spring) 30, the spring presser 40, and the string stopper 50, with the string 10 passing therethrough. FIG. 2A is a cross-sectional view of the handle unit H that is a plane including the axis (center axis) C, and FIG. 2B is an exploded perspective view of the handle unit H with the string 10 removed. FIG. 3 is a cross-sectional view schematically showing the handle unit H cut along a plane including the axis C. FIG. FIG. 4 is a diagram for explaining the handle 20, and (a), (b), and (c) are a left side view, a partially broken front view, and a right side view in this order. FIG. 5 is a diagram for explaining the spring 30, and (a), (b), and (c) are a left side view, a front view, and a right side view in this order. FIG. 6 is a diagram for explaining the spring retainer 40. (a), (b), (c), (d), and (e) are a top view, a left side view, a front view, and a right side view in this order. FIG. FIG. 7 is a diagram illustrating the string stopper 50, and (a), (b), and (c) are a top view, a front view, and a right side view in this order. FIG. 8 is a diagram for explaining another string retainer 60, wherein (a), (b), and (c) are a top view, a front view, and a right side view in this order. FIG. 9A is a view for explaining an example of use of another string stopper 60, FIG. 9A is a sectional view of the handle unit H cut along a plane including the axis C, and FIG. FIG. 6 is an exploded perspective view of the handle unit H. FIG. 10 is a diagram for explaining a usage state of the jump rope 1. FIG. 11 is a diagram illustrating the principle of the jumping rope 1 in which the rotational force increases.

  As shown in FIG. 10, the jump rope 1 includes a long string 10 and two handle units H attached to both ends of the string 10. However, in FIG. 10, only one handle unit H is illustrated. When jumping a rope, the user grasps one handle unit H with the left palm and grasps the other handle unit H with the right palm to rotate the string 10. Since the two handle units H have the same structure, only one handle unit H will be described in the following description.

As shown in FIGS. 1 to 3, the handle unit H includes a handle 20, a spring 30, a spring presser 40, and a string stopper 50.
For example, when the user of the jump rope 1 grasps one (left) handle unit H with the left palm and grasps the other (right) handle unit H with the right palm and jumps the rope alone. The length is set to be a substantially suitable length. As will be described later, the length of the string can be easily adjusted according to the height of the user. As a material of the string 10, a synthetic resin such as vinyl or a material knitted with fibers can be used. The material of the string 10 is not particularly limited. As shown in FIGS. 1 and 3, one end 11 of the string 10 is attached to one handle 20 via a spring 30, a spring retainer 40, and a string stopper 50.

  As shown in FIGS. 3 and 4, the handle 20 is formed in a substantially cylindrical shape extending from the proximal end 20 a side along the axis C toward the distal end 20 b side to which the end portion 11 of the string 10 is attached. . The handle 20 as a whole is formed in a tapered cylindrical shape whose diameter is reduced on the tip 20b side, and the inner peripheral surface 21 is also formed so that the diameter on the tip 20b side is reduced accordingly. A first opening 22 is formed at the distal end 20 b of the handle 20, and a second opening 24 having a diameter larger than that of the first opening 22 is formed at the proximal end 20 a. A spring 30 and a spring retainer 40 which will be described later can be inserted into and removed from the handle 20 through the second opening 24. A stopper surface 23 that is continuous with the first opening 22 is formed on the inner peripheral surface of the handle 20. The stopper surface 23 is formed in a tapered shape whose inner diameter increases from the distal end side continuous with the first opening 22 toward the proximal end side. Furthermore, in the illustrated example, it is formed in a truncated cone shape. An expanded portion 32 of a spring 30 described below abuts on the stopper surface 23. The shape of the handle 20 can be formed in a substantially cylindrical shape or a substantially polygonal tube shape (for example, a substantially hexagonal tube shape or a substantially octagonal tube shape).

  As shown in FIGS. 3 and 5, the spring 30 has a cylindrical portion 31 on the distal end side (the right side in FIG. 5B) and expands to the proximal end side (the left side in FIG. 5B). It is constituted by a coil spring having a portion 32. As shown in FIGS. 2A and 3, the cylindrical portion 31 protrudes outward from the first opening 22 of the handle 20. The inner diameter of the cylindrical portion 31 is set slightly larger than the diameter of the string 10. The expanding portion 32 is formed so as to be continuous with the proximal end side of the cylindrical portion 31, and is formed so that the diameter increases toward the proximal end side. In the illustrated example, it is formed in a truncated cone shape following the shape of the stopper surface 23 of the handle 20. As shown in FIG. 2A and FIG. 3, the expanding portion 32 is in contact with the stopper surface 23 of the handle 20 from the left side in these drawings. Thus, the spring 30 has its axis C aligned with the axis C of the handle 20 with high accuracy. In addition, you may form the expansion part 32 of the spring 30 in the curved surface shape approximated to this instead of the above-mentioned truncated cone shape. For example, in the shape shown in FIG. 5B, the shape of the expanded portion 32 is not limited to a linear shape, and may be smoothly convex toward the outside, or conversely toward the inside. .

  The spring retainer 40 has a pressing surface 41 on the distal end side (right side in FIGS. 6A, 6C, and 6E), and the proximal end side (FIGS. 6A, 6C, and 6E). It has a cylindrical portion 44 on the left side of the inside, and is formed in a tapered cylindrical shape as a whole. The pressing surface 41 is formed in a tapered shape whose outer diameter increases from the distal end side toward the proximal end side. In the illustrated example of the pressing surface, it is formed in a truncated cone shape following the shape of the inner surface of the expanded portion 32 of the spring 30. The spring retainer 40 positions and fixes the spring 30. That is, the spring retainer 40 is inserted from the second opening 24 on the proximal end side of the handle 20, and the pressing surface 41 is inserted into the inner peripheral surface of the expanded portion 32 of the spring 30 to stop the handle 20. 23, the expanding portion 32 is sandwiched. Accordingly, the widened portion 32 can be securely fixed over a wide area, and the entire spring 30 is positioned and fixed with high accuracy so that the axis C thereof coincides with the axis of the handle 20. Can do.

  A plurality (six in the illustrated example) of axial ribs 45 project from the outer peripheral surface of the cylindrical portion 44 of the spring retainer 40. The axial rib 45 is erected so as to extend along the axis C at each of the positions at which the outer peripheral surface of the cylindrical portion 44 is divided into six equal parts. The spring retainer 40 is easily inserted into and removed from the inside of the handle 20 by these axial ribs 45, and is disposed on the shaft center C with high accuracy when inserted.

  As shown in FIG. 6E, a through hole 42 is formed on the distal end side of the spring retainer 40, and a partition plate 43 (locking portion) is provided on the proximal end side. The through hole 42 is formed to be slightly larger than the diameter of the string 10. The partition plate 43 is formed in a rectangular shape, and is arranged so as to extend to about 1/3 of the total length of the spring retainer 40 from the proximal end side toward the distal end side, as shown in FIG. Yes. The partition plate 43 divides the space inside the proximal end of the spring retainer 40 into a region 43A and a region 43B, as shown in FIG. 6B. In the partition plate 43, as shown in FIG. 6E, a semicircular recess 43a is formed on the axis C at the base end edge corresponding to the diameter of the string 10. The spring retainer 40 locks the end portion 11 of the string 10. That is, the end 11 of the spring cord 10 passes through the through hole of the spring retainer 40 shown in FIG. 6E from the right to the left, and then shown in FIGS. 6B and 2A. It passes through the region 43A partitioned by the partition plate 43, is folded back by the recessed portion 43a of the partition plate 43, and is inserted into the region 43B in a state where a string stopper 50 described below is mounted. The spring retainer 40 thereby locks the end portion 11 of the string 10.

  As shown in FIGS. 7A to 7C, the string stopper 50 is formed in a substantially elliptical plate shape, and is formed so that two through holes 50a and 50b are adjacent to each other. Yes. Further, the outer peripheral edge of the substantially elliptical plate shape and the inner peripheral edge of the through holes 50a and 50b are formed thick so as to be edged, and the string stopper 50 is reinforced. The diameters of the through holes 50 a and 50 b are set slightly larger than the diameter of the string 10. The string stopper 50 is made of, for example, a soft synthetic resin (plastic). As shown in FIG. 2 (a), the string retainer 50 is a spring retainer in a state where the end portion 11 of the string 10 is inserted into one through hole 50a and then inserted into the other through hole 50b. 40 regions 43B. As a result, the position near the end 11 of the string 10 is fixed, and the string 10 is inserted into the region 43B in this state. For this reason, in the vicinity of the end 11 of the inserted string 10, a part of the end 10 abuts the recess 43 a at the point P against the force acting to pull out the string 10, and the string stopper Since a part of 50 contacts (contacts) the inner peripheral surface 46 of the spring retainer 40 at the point Q, it is possible to reliably prevent the end portion 11 of the string 10 from coming out of the region 43B. That is, when a force that pulls out to the right acts on the string 10 in FIG. 2A, a clockwise moment with respect to the point P acts in the vicinity of the end 11, but the point P , Q is sufficiently larger than the distance from the partition plate 43 to the inner peripheral surface of the spring retainer 40, so that the vicinity of the end 11 does not fall out of the region 43B. When the length of the string 10 is adjusted, as shown in FIG. 1, when the portion near the distal end 20b of the handle 20 in the string 10 is strongly pushed toward the base end 20a side of the handle 20, As shown, the spring retainer 40 comes out of the handle 20. Furthermore, the string removal preventing tool 50 locked to the region 43B is pulled out, and the end portion 11 of the string 10 is removed from the through holes 50b and 50a. And it cut | disconnects to appropriate length. Thereafter, in the reverse procedure described above, that is, the end portion 11 is inserted into the through holes 50a and 50b, and the string stopper 50 is inserted into the region 43B. In this state, the string 10 near the tip 20b of the handle 20 Pull the part strongly to the right in FIG. As a result, the pressing surface 41 of the spring retainer 40 is inserted into the inner surface of the expanded portion 32 of the spring 30, and the outer peripheral surface of the expanded portion 32 of the spring 30 is pressed against the stopper surface 23 of the handle 20. That is, the expanded portion 32 of the spring 30 is strongly held between the pressing surface 41 of the spring retainer 41 and the stopper surface 23 of the handle 20, and the spring 32 can be positioned and fixed on the axis C with high accuracy. .

  The operation of the skipping rope 1 having the above-described configuration will be described with reference to FIGS. As shown in FIG. 10, when the user grips and rotates the one and other handles 20 with the left and right palms respectively, the jumping rope 1 is such that the cylindrical portion 31 of the spring 30 has its distal end 31b near the proximal end 31a. Is curved as shown in FIG. FIG. 11 is a diagram schematically showing this state as seen from the direction of arrow K in FIG. In the figure, the string 10 rotates in the arrow R direction with the center C0 as a reference. At this time, the base end 31a of the cylindrical portion 31 of the spring 30 moves on the circular locus C1, and the tip 31b moves on the locus C2 having a diameter larger than the locus C1. At this time, since the cylindrical portion 31 of the spring 30 is curved as shown in FIG. 10, the restoring force F shown in FIG. 11 acts on the center of gravity G of the cylindrical portion 30. In the illustrated example, the restoring force F acts diagonally rightward on the left side of the center. Therefore, the restoring force F acts on the portion of the string 10 covered by the cylindrical portion 31 in the direction of the arrow R, that is, the direction that promotes the rotation of the string 10. Thereby, the rotational force of the string 10 increases and it becomes easy to realize high rotation, for example, it becomes easy to do double jumping. Furthermore, in the present embodiment, the spring 30 has its expanded portion 32 sandwiched between the stopper surface 23 of the handle 20 and the pressing surface 41 of the spring retainer 40, and is positioned and fixed on the axis C with high accuracy. Therefore, compared with the case where the spring is not fixed (for example, the conventional example), the restoring force F of the spring 30 can be effectively applied in the direction of promoting the rotation of the string 10. That is, it is easy to realize high rotation of the string 10.

  Next, with reference to FIG. 8 (a), (b), FIG. 9 (a), (b), another string removal prevention tool 60 is demonstrated. The string stopper 60 is formed in an oval plate shape in which the oval is further extended in the longitudinal direction, and two through holes 60a and 60b are formed so as to be adjacent to each other in the center in the longitudinal direction. ing. The oval outer peripheral edge and the inner peripheral edges of the through holes 60a and 60b are thickened for reinforcement. Since the usage method of this retainer 60 is the same as that of the above-mentioned string retainer 50 shown in FIG. 7, the detailed description is abbreviate | omitted.

  According to this string stopper 60, as shown in FIG. 9A, the string stopper attached to the end 11 of the string 10 in the region 43B partitioned by the partition plate 43 inside the spring retainer 40. When 60 is inserted, one end in the longitudinal direction of the string stopper 60 (left end in the illustrated example) protrudes leftward from the left end edge of the spring retainer 40. Therefore, when the string stopper 60 is pulled out from the region 43B, the protruding portion can be grasped and pulled out, so that the pulling operation becomes easy.

It is a disassembled perspective view of the handle unit H which consists of the handle | steering-wheel 20, the spring 30, the spring presser 40, and the string removal prevention tool 50 in the state which the string 10 passed. (A) is sectional drawing of the handle unit H which was able to be planar including the axial center (center axis) C, (b) is an exploded perspective view of the handle unit H in the state where the string 10 was removed. It is sectional drawing which shows typically the handle unit H cut by the plane containing the axial center C. FIG. It is a figure explaining the handle | steering-wheel 20, (a), (b), (c) is a left view, a partially broken front view, and a right view in this order. It is a figure explaining the spring 30, (a), (b), (c) is a left view, a front view, and a right view in this order. It is a figure explaining the spring holding | suppressing 40, (a), (b), (c), (d), (e) is a top view, a left side view, a front view, a right side view, AA in this order. FIG. It is a figure explaining the string removal prevention tool 50, (a), (b), (c) is a top view, a front view, and a right view in this order. It is a figure explaining the other string removal prevention tool 60, (a), (b), (c) is a top view, a front view, and a right view in this order. (A) is a figure explaining the usage example of the other string removal prevention tool 60, (a) is sectional drawing cut | disconnected by the plane containing the axial center C of the handle unit H, (b) is a handle | steering-wheel. 3 is an exploded perspective view of a unit H. FIG. It is a figure explaining the use condition of jump rope. It is a figure explaining the principle that the rotational force of the jump rope 1 increases.

DESCRIPTION OF SYMBOLS 1 Jump rope 10 String 11 End 20 of a string Handle 20a Base 20b of a handle Tip 22 of a handle 1st opening 23 Stopper surface 24 2nd opening 30 Spring (coil spring)
31 Cylindrical portion 31a Base end 31b of the cylindrical portion 32 Tip of the cylindrical portion 32 Expanded portion 40 Spring pressing 41 Pressing surface 42 Spring pressing through-hole 43 Partition plate (holding portion, locking portion)
44 Tubular part 45 Axial ribs 50, 60 Retaining stoppers 50a, 50b, 60a, 60b
Through hole C for string stopper C H axis Handle unit

Claims (7)

In a jump rope comprising a long string and two handle units attached to both ends of the string,
The handle unit is
A first opening formed at the distal end on the axis, and formed in a substantially cylindrical shape extending from the proximal end side toward the distal end side to which the end of the string is attached along the axis; A handle having a stopper surface whose diameter increases toward the base end side on an inner peripheral surface continuous to the first opening;
A coil spring having a cylindrical portion that protrudes from the first opening, and an expanded portion that is continuous with the proximal end side of the cylindrical portion and that is formed to follow the stopper surface and contacts the stopper surface ,
A pressing surface that is formed to follow the inner surface of the expanding portion, is inserted into the expanding portion and sandwiches the expanding portion between the stopper surface, and an end of the string that penetrates the axis of the spring A spring retainer having a locking portion for locking the portion,
Rope skipping characterized by that. The stopper surface, the expanding portion, and the pressing surface are formed in a truncated cone shape.
The jump rope according to claim 1. The spring retainer is formed on the distal end side, and a through hole through which the end of the string penetrates along the axis, and an end of the string that is formed on the proximal end side and penetrates the through hole. A holding portion for folding back and holding to prevent the end of the string from coming off,
The jump rope according to claim 1 or 2, characterized in that. It has a string removal prevention tool that bends the end of the string and holds it in the holding part in a bent state.
The jump rope according to claim 3. The string stopper has two through holes that are adjacent to each other and are approximately the same size as the diameter of the string, and the end of the string is connected to one through hole and the other through hole. Insert and bend the end of the string,
The jump rope according to claim 4. The handle has a second opening that allows passage of the spring and the spring retainer at a proximal end.
The jump rope according to any one of claims 1 to 5, characterized in that: The spring retainer has a cylindrical portion on the proximal end side of the pressing surface, and the cylindrical portion protrudes from each of the positions at which the outer peripheral surface is equally divided in the circumferential direction and extends along the axial direction. An axial rib extending to contact the inner peripheral surface of the handle;
The jump rope according to claim 6.

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