JP3053506U - Bicycle wheel rim - Google Patents

Abstract

(57) [Summary] The present invention provides a bicycle wheel rim that can use wheel spokes having a uniform length size, facilitates assembling operation, and can be expected to improve work efficiency. The present invention comprises a left side wall (21) and a right side wall (22) extending in a ring shape at an appropriate interval, and extends in a concentric ring shape between the both side walls (21, 22). An annular groove (24) for connecting a tire is formed by being connected by a screw seat (23), and a left-handed screw portion (231) and a right-hand side wall near the left side wall (21) are formed in the screw seat (23). (2
2) A plurality of left and right spoke holes of a zigzag distribution along the center line of the screw seat (23) are formed in the left and right screw portions (231 and 232) by forming a right screw portion (232) closer to the left and right screw portions. (235,
236), a difference in elevation is formed between the left and right screw fixing portions (231, 232) so that the left and right spoke holes (235, 23) are formed.
The predetermined height difference is maintained during 6).

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a bicycle wheel rim, and more particularly, to a bicycle wheel rim that can be conveniently assembled and improved in working efficiency by using spokes of the same size for the same wheel.

[0002]

[Prior art]

 A bicycle wheel having a shifting function that is commonly seen will be described with reference to a rear wheel 11 shown in FIG. 6. The rear wheel 11 is combined with a normal shifting gear set 12 to be coaxially driven by a center shaft 13. Assembled between the rear claws extending to the lower ends of the back forks 14, 15 corresponding to the left and right ends, the rear wheel 11 includes a wheel rim 111, a central hub 112, and a plurality of left and right wheels. The wheel rim 111 has an annular groove 116 for accommodating a tire 115 and a screw seat 117 formed at the bottom of the annular groove 116. The screw seat 117 has a predetermined interval along the wheel rim 111. A plurality of spoke holes 118 are penetrated in a staggered arrangement, and the left and right spokes 113 and 114 are connected between the respective spoke holes 118 and the hub collars 119 and 119 'on both sides of the hub. It has become an elephant.

[0003]

[Problems to be solved by the invention]

 By the way, the hub 112 and the transmission gear set 12 are mounted on the shaft 13 at the same time, and since the transmission gear set 12 is provided on one side of the wheel, the body frame is balanced in the width direction. In order to control and sufficiently utilize the space between the back forks 14, 15, the hub 112 is provided slightly to the left back fork 14, and the bicycle tire 115 is always provided between the back forks 14, 15. Although the hub 112 cannot be mounted in the middle between the two back forks 14 and 15 like the tire 115, the length of the right spoke 114 near the transmission gear set 12 must be increased. It is shorter than the left spoke 113 near the left back fork 14.

When manufacturing spokes, it is necessary to make both left and right spokes of different lengths for wheels of the same standard, but the left and right spokes 113 and 114 have different lengths. Is by no means large, a slight difference of about 2 mm. Therefore, on the one hand, the left and right spokes 113, 114 differing in length must be made during manufacturing, which requires a relatively long time and labor, and on the other hand, the length difference between the left and right spokes 113, 114 during assembling. However, because it is not so clear, it is easy to assemble it due to carelessness, and it may make poor quality bicycle rear wheels.

The present invention has been made in view of the above-mentioned problems in the conventional wheel rim of a bicycle, and allows use of wheel spokes having a uniform length and size, assembling operation is convenient, and work efficiency is improved. An object of the present invention is to provide a bicycle wheel rim that can be expected to be improved.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a tire having a left side wall and a right side wall which are opposed to each other in a ring shape at appropriate intervals, and which are connected to each other by a screw seat which extends in a concentric ring shape between the both side walls. And a left threaded portion near the left side wall and a right threaded portion near the right side wall are formed in the screw seat, and the screw seat is formed in the left and right threaded portions. In a bicycle wheel rim having a plurality of left and right spoke holes in a staggered distribution along the center line left and right, a height difference is formed between the left and right screw holes, thereby forming the left and right spoke holes. It is configured to keep a predetermined height difference between.

In the present invention configured as described above, the screw seat between the left and right walls is divided into left and right threaded sections having an appropriate height difference, and the screw seats are opened in the left and right threaded sections. The left and right spoke holes are provided with a height difference, and the height difference causes the wheel hub to be positioned closer to the left backhawk. It compensates for the form in which the linear distance from the hole is different. That is, the right-hand threaded portion is lifted and raised to a predetermined width in a direction away from the wheel hub to slightly raise the position of the right spoke hole, so that the linear distance between the left spoke hole and the left collar portion and the right spoke Since the straight line distance between the hole and the right collar has become equal, the left and right spokes assembled between the left spoke and the left collar and between the right spoke and the right collar are assembled. It can be served with the same length size.

[0008]

[Embodiment of the invention]

 Hereinafter, the present invention will be specifically described based on an embodiment, but the present invention is not limited to this example.

As shown in FIG. 1, a wheel rim 2 of a bicycle according to a first preferred embodiment of the present invention is used for assembling a rear wheel 3 of a variable speed bicycle. At the rear end of the body frame of the variable speed bicycle, left and right back forks 41 and 42 corresponding to each other are provided at an appropriate interval. A mandrel 43 is erected in an orthogonal direction. The wheel rim 2 is mounted on the shaft 43 together with a transmission gear set 32 via a hub 31. The wheel rim 2 is located on the center line between the left and right back forks 41, 42, the transmission gear set 32 is located near the inner side of the right back fork 42, and the hub 31 is located on the inner side of the left back fork 41. Left and right flanges 33 and 34 are formed near the sides and are respectively connected to one end of a plurality of left and right spokes 35 and 36 around appropriate positions around both ends of the hub 31.

As shown in FIGS. 2 and 3, the wheel rim 2 comprises a left side wall 21 extending in a ring shape at an appropriate interval and a right side wall 22 near the transmission gear set 32. An annular groove 24 for mounting a tire is formed by connecting the side walls 21 and 22 with a screw seat 23 extending in a concentric ring shape. A ridge line 25 extending in the same direction as the left and right side walls 21 and 22 is provided at the bottom of the screw seat 23. As described above, the wheel rim 2 is connected to the left and right back forks 41. , 42, the hub 31 is provided slightly near the left back hawk 41, so that the ridge 25 and the left and right flanges of the hub 31 are provided as shown in FIG. The straight line distance between the portions 33 and 34 is not equal, that is, the straight line distance between the ridge line 25 and the right collar portion 34 is slightly shorter than the straight line distance between the ridge line 25 and the left collar portion 33. The ridgeline 25 divides the screw seat 23 into a left-hand threaded portion 231 near the left side wall 21 and a right-handed threaded portion 232 near the right side wall 22. The right contact surface 233 is also provided on the right threaded portion 232 in such a manner that the right contact surface 233 rises to a predetermined width in a direction adjacent to the left contact surface 233 in the annular groove 24 and away from the hub 31. 234, thereby forming a predetermined drop H between the left and right contact surfaces 233, 234, and a plurality of staggered winds on the left and right contact surfaces 233, 234 along the left and right of the ridgeline 25. The left and right spoke holes 235 and 236 penetrate the left and right spoke holes 235 and 236, respectively, and the nipple 237 screwed with the screw ends of the other ends of the left and right spokes 35 and 36 respectively. , 238 are inserted.

Since the head H is formed, there is also a height difference between the left and right spoke holes 235 and 236, and the height difference is determined by positioning the hub 31 near the left back fork 41. Therefore, it is possible to supplement the relationship in which the linear distances between the left and right brim portions 33, 34 at both ends of the hub 31 and the ridgeline 25 of the wheel rim 2 are different from each other. The right spoke hole 236 is raised slightly to a predetermined width in a direction away from the right spoke hole 231, so that the position of the right spoke hole 236 is slightly increased, and the linear distance between the left spoke hole 235 and the left collar portion 33 is reduced to the right spoke hole 236. Is equal to the straight line distance between the left spoke hole 235 and the left collar portion 33 and between the right spoke hole 236 and the right collar portion 34. , Right sport Arks 35 and 36 can be provided with the same length and size.

FIG. 4 shows a second preferred embodiment of the present invention, which is a wheel rim 5 which can be assembled to the rear wheel of a variable speed bicycle similarly to the first embodiment. There are left and right side walls 51 and 52, a screw seat 53, an annular groove 50, a left screw fixing portion 531 and a right screw fixing portion 532 which are parallel to each other along a predetermined interval. , 532 also have left and right spoke holes 533 and 534, respectively, and a first right screw portion 535 is formed above the right screw portion 532 so that the first right screw portion 535 and An auxiliary wall 536 is provided between the left-hand threaded portion 531 and a plurality of first right-spoke holes 537 corresponding to the right-spoke holes 534 are provided through the auxiliary wall 536 so that the first right-spoke hole 537 is formed. Same as H of the first embodiment between the spoke hole 537 and the left spoke hole 533. The height difference.

[0013] In order to improve the bonding strength, a reinforcing plate 54 is laid across and connected between the left and right side walls 51 and 52, and each of the right spoke holes 534 and the first spokes 534 is formed in the reinforcing plate 54. The relatively large-diameter through holes 541 and 542 corresponding to the right spoke hole 537 and the left spoke hole 533 are opened, and the nipples 56 and 55 are inserted through the through holes 541 and 542, respectively. It is inserted into the first right spoke hole 537 and the left spoke hole 533. The nipple 55 is inserted into the left spoke hole 533, and its head 551 abuts and locks on the left spoke hole 533, and a part of the head 551 is attached to the auxiliary wall 536. Abut and lock.

FIG. 5 shows a third preferred embodiment of the present invention, which is a wheel rim 6 which can be assembled to the rear wheel of a variable-speed bicycle similarly to the second embodiment. There are left and right walls 61 and 62, a screw seat 63, an annular groove 64, a left screw fixing portion 631, a right screw fixing portion 632, a first right screw fixing portion 633, and a reinforcing plate which correspond to each other along a predetermined interval in parallel. Part 65, and an auxiliary wall 634 between the first right-hand screw setting part 633 and the left-hand screw setting part 631, the left-hand screw setting part 631, the first right-hand screw setting part 633, and the right-hand screw setting part 632 are provided with a plurality of left spoke holes 635, a first right spoke hole 636, and a right spoke hole 637, respectively, and the height is similarly set between the left spoke hole 635 and the first spoke hole 636. Make the difference. The difference between the present embodiment and the second embodiment is that the present embodiment simply enhances the bonding strength that extends downward from the bottom of the reinforcing plate portion 65 and is connected to the lower edge of the first right-hand threaded portion 633. Since the useful connecting plate 66 is provided, the other assembling and use modes are the same as those of the above-mentioned embodiments, and it is assumed that there is no redundancy here.

[0015]

[Effect of the invention]

 As described above, according to the present invention, the screw seat between the left and right walls is divided into left and right threaded sections having an appropriate height difference, and the left and right threaded sections are opened in the left and right threaded sections. A height difference is also formed in the spoke holes, and the height difference causes the wheel hub to be positioned closer to the left backhawk, resulting in a straight line distance between the left and right collars at both ends of the wheel hub and the left and right spoke holes of the wheel rim. Can compensate for different forms. That is, the right-hand threaded portion is lifted up to a predetermined width in a direction away from the wheel hub, and the position of the right spoke hole is slightly increased, so that the linear distance between the left spoke hole and the left collar portion and the right spoke hole are increased. Since the straight line distances between the left spoke and the right collar are equal, the left and right spokes assembled between the left spoke and the left collar and between the right spoke and the right collar are the same. Since the length can be covered, the production or assembly can be simplified, and the production efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic view of a preferred embodiment of the present invention.

FIG. 2 is a three-dimensional view of a local structure in the embodiment.

FIG. 3 is a cross-sectional view of the embodiment.

FIG. 4 is a cross-sectional view of a second preferred embodiment of the present invention.

FIG. 5 is a cross-sectional view of a third preferred embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional bicycle having a rear wheel assembled with a shifting function in a bicycle.

[Explanation of symbols]

2: Wheel rim 21: Left side wall 22: Right side wall 23: Screw seat 231: Left screw fixing part 232: Right screw fixing part 235: Left spoke hole 236: Right spoke hole 237, 238: Nipple 24: Ring groove 531: Left Screw set part 532: Right screw set part 533: Left spoke hole 534: Right spoke hole 535: First right screw set part 536: Auxiliary wall 537: First right spoke hole 54, 65:
Reinforcement plate parts 541, 542: through hole 633: first
Right-hand threaded part 66: connecting plate

Claims (1)

[Utility model registration claims] An annular groove for attaching a tire is provided, comprising a left side wall and a right side wall which are opposed to each other in a ring shape at appropriate intervals, and which are connected by a similar ring-shaped screw seat between the both side walls. And forming a left-hand threaded portion near the left side wall and a right-handed threaded portion near the right side wall on the screw seat, so that the left and right screw portions have a staggered distribution along the left and right sides of the center line of the screw seat. In the wheel rim of a bicycle having a plurality of left and right spoke holes penetrating therethrough, a height difference is formed in the left and right screw holes, whereby a predetermined height difference is formed between the left and right spoke holes. Bicycle wheel rim that can be kept.