TWI836773B - Jig for bicycle fork seat - Google Patents

Abstract

A jig for bicycle fork seat includes a workbench for positioning the bicycle fork seat and a securing device. The bicycle fork seat includes a left portion, a right portion and a middle portion having a through hole with a step edge located at top of the through hole. The securing device includes a driving member and a pressing block located above the through hole. The driving member drives the pressing block to move downward so as to press upon the step edge, thereby securing the bicycle fork seat on the workbench.

Description

Bicycle front fork seat machining jig

The present invention relates to a processing jig, in particular to a processing jig for a bicycle front fork base.

The front fork of a bicycle connects the axle to the steering handlebar so that the user can manipulate the steering handlebar to control the wheel swing and change the direction of travel. It is one of the important parts, and the front fork seat is the basic component of the front fork. After the left, right and middle sleeve parts are drilled, and the weight-reducing holes of the left and right ribs are made during the manufacturing process of the front fork seat, the top and bottom surfaces of the left and right sleeve parts will be milled. With the popularity of bicycle sports in recent years, the industry has begun to have higher requirements for the decorativeness and design of the external shape of the front fork seat, especially for higher-end products. Therefore, the workpiece must be carefully paid attention to during the manufacturing process, and even when using a jig to fix the workpiece, it should not be clamped too tightly to avoid damaging the surface of the workpiece. However, the workpiece must still be stably fixed in place before processing, so it is necessary to develop a special jig corresponding to this processing process.

In order to solve the above problems, the present invention provides a processing jig for a bicycle front fork seat, wherein the front fork seat has a middle sleeve part, a left sleeve part and a right sleeve part, and the middle sleeve part has a The top of the sleeve hole has a first-level edge; the processing jig includes: 1. A workbench on which the front fork base can be placed; A workpiece fixing device is provided on the workbench and includes a driving part and a pressing block. The pressing block is located above the sleeve hole. The driving part can drive the pressing block to move up and down, and make the pressing block move up and down. The pressing block is pressed down on the step edge to fix the front fork base on the workbench.

In one embodiment, the workbench is provided with a protruding positioning block that can support the middle sleeve portion in the sleeve hole.

Preferably, the workbench is provided with a straight through hole, the driving member is arranged below the workbench, the driving member is provided with a connecting rod passing through the straight through hole, and the pressure block is arranged at the top end of the connecting rod.

Furthermore, the straight hole penetrates the workbench and the positioning block.

In one embodiment, the pressing block is detachably coupled to the connecting rod. The top end of the connecting rod is connected to a head with an outer diameter larger than that of the connecting rod. The pressure block is provided with a groove recessed from one side of the peripheral edge. The width of the groove is between the outer diameters of the connecting rod and the head. between.

In one embodiment, two workpiece positioning devices are further included and are spaced apart on the workbench, respectively supporting the left sleeve portion and the right sleeve portion of the front fork seat. The workpiece positioning device has a spring and can automatically adjust the left sleeve portion and the right sleeve portion to a predetermined position by the spring force.

Please refer to Figures 1 to 3, which show a processing jig for a bicycle front fork seat provided by the present invention, which is used in the mid-term processing process of the front fork seat. Referring to Figure 7, the front fork seat 4 has completed the drilling operations such as the sleeve holes and weight-reducing holes of the left, right and middle sleeve parts 41, 42, 43, and formed a first-step edge 412 at the top end of the sleeve hole 411. However, since the drilling may cause complex internal stress changes, resulting in slight deformation of the overall shape of the front fork seat 4, the milling operation of the top and bottom surfaces of the left and right sleeve parts 42, 43 is then performed, and the height difference between the bottom surfaces of the left and right sleeve parts 42, 43 and the bottom surface of the middle sleeve part 41 is made to meet a predetermined value H through trimming.

The processing jig of the present invention includes a workbench 1 on which a front fork seat 4 can be placed. The figure shows that there are two sets of devices on the workbench 1 for fixing and positioning the front fork seat 4. Under the technical spirit of the present invention, this number is not limited. The following is only one set for description. The workbench 1 is raised and suspended by a plurality of pillars 11, thereby forming a lower space 10 below the workbench 1. A circular positioning block 12 in the form of a protrusion is provided at the position on the workbench 1 where the front fork seat is predetermined to be placed. The outer diameter of the positioning block 12 is approximately equal to the inner diameter of the sleeve hole 411 of the middle sleeve portion 41 of the front fork seat 4. Referring to FIG. 5 , when the front fork seat 4 is placed on the workbench 1 with the sleeve hole 411 of the middle sleeve portion 41 corresponding to the positioning block 12, the positioning block 12 can be supported against the hole wall in the sleeve hole 411, thereby positioning the front fork seat 4.

As mentioned above, the workbench 1 and the positioning block 12 are provided with a through hole 13. The lower space 10 is provided with a workpiece fixing device 3, which includes a driving member 31 and a pressing block 32, wherein the driving member 31 is connected to a connecting rod 311, and the connecting rod 311 passes through the through hole 13 upward from the lower space 10 and extends out of the workbench 1, and the pressing block 32 is arranged at the top end of the connecting rod 311, and the driving member 31 can drive the connecting rod 311 to produce up and down displacement, thereby causing the pressing block 32 to move up and down. In this embodiment, the combination of the driving member 31 and the connecting rod 311 can be a piston rod driven by oil pressure or air pressure, a screw rod set driven by an electric motor, etc., which is not limited here. The top end of the connecting rod 311 is connected to a head 312 with an outer diameter larger than the connecting rod 311, and the pressure block 32 is recessed from one side of its periphery to form a groove 321, wherein the width of the groove 321 is larger than the outer diameter of the connecting rod 311 and smaller than the outer diameter of the head 312. Accordingly, the pressing block 32 can be coupled to the connecting rod 311 by inserting the connecting rod 311 into the groove 321 , and the pressing block 32 is blocked by the head portion 312 and cannot be separated from the connecting rod 311 upward.

On the other hand, a workpiece positioning device 2 with a spring 21 is respectively provided on both sides of the positioning block 12 on the workbench 1, which is fixed on a base 14 for automatically adjusting the position of the front fork seat 4 placed on the workbench 1. Specifically, as shown in FIG. 4 , although the front fork seat 4 has been limited in position by the positioning block, the left and right sleeve portions 42 and 43 may still rotate and deviate from the standard working position. Then, through the workpiece positioning device 2, a U-shaped push block 22 is connected to the spring 21, and the U-shaped push block 22 is held against one side of the left and right sleeve portions 42 and 43. The elastic force of the spring 21 is used to push the left and right sleeve portions 42 and 43. No matter where the left and right sleeve portions 42 and 43 are initially placed, they will eventually be pushed to the predetermined position, thereby positioning the front fork seat 4 for subsequent fixing. In this embodiment, the workpiece positioning device 2 can be a spring end clamp.

When the present invention is actually used, as shown in Figure 5, the front fork base 4 is first placed on the workbench 1 with the sleeve hole 411 of the middle sleeve portion 41 corresponding to the positioning block 12. At this time, the workpiece positioning device 2 The left and right sleeve parts 42 and 43 will be pushed by the spring 21, thereby automatically adjusting the entire front fork base 4 to the standard working position. At the same time, the driving member 31 and its connecting rod 311 pass through and extend out of the sleeve hole 411 of the middle sleeve portion 41 , and the operator can place the pressing block 32 on the connecting rod 311 through the groove 321 . Then, the driving member 31 is operated to drive the connecting rod 311 to move downward, and the head 312 of the connecting rod 311 pushes against the pressing block 32 to move downward synchronously. As shown in FIG. 6 , the pressing block 32 is stuck on the on the step edge 412 of the sleeve hole 411, and exert downward pressing force on the middle sleeve portion 41, thereby fixing the entire front fork base 4 on the workbench 1.

With the above structure, the jig of the present invention can first ensure that the front fork base 4 is positioned at the standard position to be processed, and then fix the front fork base 4 through the pressing block 32 . On the premise of stabilizing the front fork seat 4, the present invention chooses the technical solution of pressing the pressing block 32 against the step edge 412 of the middle sleeve part 41, which can reduce the area of contact with the front fork seat 4, thereby reducing collisions. The effect of the surface condition of the workpiece.

1: workbench 10: Lower space 11:Pillar 12: Positioning block 13: Straight punch 14: base 2: Workpiece positioning device 21:Spring 22: Push block 3: Workpiece fixation device 31:Driving parts 311: Connecting rod 312:Head 32:Block 321:Trench 4: Front fork seat 41: Middle sleeve part 411:Sleeve hole 412:Step edge 42:Left sleeve part 43: Right sleeve part

Figure 1 is a three-dimensional schematic diagram of the present invention; Figure 2 is a three-dimensional exploded schematic diagram of the present invention; Figure 3 is a cross-sectional schematic diagram of the present invention; Figure 4 is a schematic diagram of the present invention for positioning the front fork seat; Figures 5 and 6 are schematic diagrams of the present invention for clamping the front fork seat in action; Figure 7 is a schematic diagram of the process goal to be achieved by using the present invention.

1: Workbench

10: Lower space

12: Positioning block

2: Workpiece positioning device

3: Workpiece fixing device

31:Driving parts

32:Block

Claims (8)

A processing jig for a bicycle front fork seat, wherein the front fork seat has a middle sleeve part, a left sleeve part and a right sleeve part, the middle sleeve part has a sleeve hole, and the sleeve hole has The top has a first-order edge; the processing fixture includes: 1. A workbench on which the front fork base can be placed; A workpiece fixing device is provided on the workbench and includes a driving part and a pressing block. The pressing block is located above the sleeve hole. The driving part can drive the pressing block to move up and down, and make the pressing block move up and down. The pressing block is pressed down on the step edge to fix the front fork base on the workbench. The processing jig for a bicycle front fork base as claimed in claim 1, wherein the workbench is provided with a protruding positioning block that can support the middle sleeve portion in the sleeve hole. The processing jig for a bicycle front fork base as claimed in claim 1, wherein the workbench is provided with a straight through hole, the driving member is provided below the workbench, and the driving member is provided with a connecting rod passing through the straight through hole. , the pressure block is located at the top of the connecting rod. The processing jig for a bicycle front fork seat as described in claim 3, wherein the pressing block is detachably combined with the connecting rod. The processing jig for a bicycle front fork seat as described in claim 4, wherein the top of the connecting rod is connected to a head with an outer diameter larger than that of the connecting rod, and the pressure block is provided with a groove recessed from one side of the peripheral edge. , the width of the groove is between the outer diameter of the connecting rod and the head. A processing jig for a bicycle front fork seat as described in claim 3, wherein the workbench is provided with a positioning block in a protruding shape, and the positioning block can support the middle sleeve part in the sleeve hole. A processing jig for a bicycle front fork as described in claim 6, wherein the straight through hole passes through the workbench and the positioning block. The processing jig for a bicycle front fork seat as described in claim 1, which further includes two workpiece positioning devices arranged at intervals on the workbench, respectively resisting the left sleeve part and the right sleeve part of the front fork seat. The sleeve part, the workpiece positioning device has a spring and can automatically adjust the left sleeve part and the right sleeve part to a predetermined position by elastic force.

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