Bicycle frame press-fit bottom bracket removal tool

Abstract

To provide a press-fit type bottom bracket removal tool that has good workability and is widely usable by supporting all press-fit type bottom brackets regardless of specifications, inner diameter, outer diameter and manufacturer.SOLUTION: A removal tool is mounted to a press-fit type bottom bracket which has been press-fitted in a frame and a pressing force nut 7 is fastened in, such that claws at tip parts of a plurality of arms 3 are pushed and expanded outward by pressing force of a tapered press piece member 4 and a spring 5 and is fits in a sword 15 inside of all kinds of bottom brackets different in inner diameter. A tubular cylinder 11 as an auxiliary tool is mounted to a thin diameter part 2 of a removal tool and the inner diameter of the cylinder is increased / decreased via an adjusting knob 13 such that the cylinder is fitted to an outer diameter of an outside flange 18 of the bottom bracket. Then, an extraction nut 8 is fastened in through a cover 10 and a thrust bearing 9, which allows a bottom bracket to be removed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] This relates to a tool that easily removes a press-fit type bottom bracket from a bicycle frame. [Background technology]

[0002] Conventional tools for removing press-fit bottom brackets from bicycles include a method in which a tube with a horn-shaped end is inserted into the bottom bracket and then struck with a hammer to knock it out, or a tool that hooks a plate onto the bottom bracket and pulls it out. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] PARK TOOL product model number BBT-90.3 https: / / www.hozan.co.jp / parktool / catalog / bottom_bracket / BBT-90.3.html [Non-Patent Document 2] Super B Product Model Number TB-19003 http: / / www.superbiketool.com / prod4.asp?menu=3&cid=2&pid=568 [Non-Patent Document 3] Shimano Product Number TL-BB13 Y13098262 (shimano.com) Summary of the Invention [Problem to be solved by the invention]

[0004] However, there are many standards for the inner diameter, width, etc. of the bottom bracket shell of a bicycle frame, and therefore there is a wide variety of dimensions such as the inner diameter, outer diameter, outer diameter of the outer flange, and inner diameter of the inner flange of the bottom bracket body. There are conventional methods such as using a trumpet-shaped tube with a hammer to strike the bottom bracket and knock it out, or tools that hook the plate and pull it out, but in many cases these cannot be used if the dimensions of the various parts of the bottom bracket body are different.

[0005] When removing a bottom bracket by hitting it with a hammer, if you do not support the other side, the force of the impact will escape to the other side, making it difficult to do the work by yourself. Also, the removed bottom bracket is often damaged by the impact. [Means for solving the problem]

[0006] To provide a tool for removing a wide variety of press-fit bottom brackets, regardless of standard, manufacturer, or dimensions of each part.

[0007] The present invention relates to a removal tool for a press-fit type bottom bracket that is press-fitted into a bicycle frame, A cylinder having an outer diameter that can be inserted into the bottom bracket; a thin-diameter portion protruding coaxially from the center of one end face of the cylinder and having a male screw at a tip portion; A plurality of arms are provided on the one side of the cylinder in a state surrounding the small diameter portion; a pusher member having a through hole into which the thin diameter portion can be inserted and slidable relative to the thin diameter portion; a pressing mechanism for pressing the pusher member from the tip portion side to the arm side; Equipped with the arm has a claw that protrudes toward a side away from the small diameter portion when the arm tip is in a closed state, The arms are arranged so that, when closed, they are within the range of the cylinder as viewed in the axial direction of the cylinder, The tip of the pusher member has a tapered shape that decreases in diameter toward the arm side, When the pusher member is pushed by the pushing mechanism and slides toward the column, the arms are pushed apart by the tapered shape of the pusher member, This is a press-fit type bottom bracket removal tool for a bicycle frame, characterized in that it is equipped with a mechanism that rotates the tip of the arm around the base of the arm on one side of the cylinder in a direction away from the thin diameter portion.

[0008] The present invention relates to a removal tool for a press-fit type bottom bracket that is press-fitted into a bicycle frame, A cylinder having an outer diameter that can be inserted into the bottom bracket; a thin-diameter portion protruding coaxially from the center of one end face of the cylinder and having a male screw at a tip portion; a detachable arm body having a cylindrical body having the same outer diameter as the cylindrical body, an insertion hole opening at the center of an end face into which the thin-diameter portion can be inserted, and a plurality of arms installed on one side of the cylindrical body in a state surrounding the thin-diameter portion when inserted; a through hole into which the thin-diameter portion can be inserted; a pusher member slidable relative to the small diameter portion; a pressing mechanism for applying a pressure to the pusher member from the tip portion side to the arm body side; Equipped with When the arm body is fitted to the small diameter portion, each arm has a claw protruding toward a side away from the small diameter portion in a state where the arm tip portion is closed, Furthermore, each arm is installed so as to be contained within the range of the cylinder when viewed in the axial direction of the cylinder, a tip end of the pusher member has a tapered shape that decreases in diameter toward the arm tip side of the arm body, When the pushing mechanism pushes the pusher member and slides toward the column, the arms are pushed apart by the tapered shape of the pusher member, The tool for removing a press-fit type bottom bracket of a bicycle frame is characterized in that the tip of the arm rotates around the arm base on one side of the arm body in a direction away from the thin diameter portion.

[0009] The present invention relates to an auxiliary tool for use with a press-fit type bottom bracket removal tool that is press-fitted into a bicycle frame as described in claim 1 or 2, A cylindrical tube with an inner diameter that fits the outer diameter of the flange on the outside of the bottom bracket. A cylindrical tube having a notch on a side surface, a plurality of bands wound in a ring shape around the outer periphery of the tube, and the tube having an inner diameter adjustment mechanism having an adjustment knob that allows the circumferential length of the bands to be changed; an extraction mechanism having a lid, a thrust bearing, and an extraction nut; Equipped with the tube has an inner diameter that can be enlarged or reduced by changing the circumferential length of the band with the adjustment knob, and can be fitted to an outer diameter of an outer flange of the bottom bracket that is press-fitted into the bicycle frame; This is an auxiliary tool that enables removal of the bottom bracket by attaching the removal tool to the bottom bracket, inserting the tube, lid, and thrust bearing into the thin-diameter portion of the removal tool from the thin-diameter side of the removal tool, and screwing the extraction nut into the thread of the thin-diameter portion so that pressure is applied to the tube. Effect of the Invention

[0010] The press-fit type bottom bracket removal tool of the present invention shown in Figure 1 uses a pressing mechanism such as a cylinder, a thin cylindrical portion, an arm, a pusher member, a spring, etc., a cylindrical tube with an adjustable inner diameter, and an auxiliary tool equipped with a pulling mechanism, making it possible to easily remove press-fit type bottom brackets even if the dimensions and standards of the inner and outer diameters of the press-fit type bottom brackets pressed into the bicycle frame are different.

[0011] As shown in Figure 4(a), the conventional method of using a trumpet-shaped tube 116 to strike a bottom bracket 114 with a hammer 112 from the side of the bicycle delivers an impact to the frame, but at the same time the force is dissipated to the other side, making it difficult for one person to do the work. However, by using the tool of the present invention, the work can be easily done by one person, and work efficiency can be greatly improved.

[0012] When using the conventional method of hitting the bottom bracket 114 with a hammer 112, there is a very high possibility that the bottom bracket 114 will be damaged, but by using the tool of the present invention, there is a very high possibility that the removed bottom bracket 114 can be reused without being damaged. [Brief description of the drawings]

[0013] [Figure 1] 1 is a component part of a bicycle frame press-fit type bottom bracket removal tool and aid of the present invention. [Diagram 2] 2 is a modified example of the tool shown in FIG. 1. [Diagram 3] 2A to 2C are diagrams illustrating a procedure for using the tool shown in FIG. 1. [Figure 4] FIG. 1 is a diagram of a tool that has been commonly used in the past. [Diagram 5] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present invention is a bicycle frame press-fit type bottom bracket removal tool for use in the method shown in FIG. In the following, the bicycle frame press-fit type bottom bracket removal tool of the present invention will be referred to as Tool A, the auxiliary tool for the bicycle frame press-fit type bottom bracket removal tool of the present invention will be referred to as Tool B, and the modified example of the bicycle frame press-fit type bottom bracket removal tool will be referred to as Tool C.

[0015] Tool A in FIG. 1 is a cylinder 1 having a hole or other stopper at one end, a thin-diameter section 2 having a male screw at the tip protruding from the center of the other end, and a plurality of arms 3 that are attached to the end of the thin-diameter section of the cylinder 1, have a smaller diameter than the outside diameter of the cylinder 1 when closed, and have claws at their rotatable tips. It is equipped with a tapered pusher member 4 having the same outer diameter as that of the cylinder 1 for pushing the arm 3 outward, a spring 5 which is a pressing mechanism for applying pressure to the pusher member, a washer 6, and a pressing nut 7.

[0016] Tool B in FIG. 1, which is an auxiliary tool for tools A and C of the present invention, is composed of a tube 11, a lid 10, a pulling nut 8, and a thrust bearing 9 for reducing the surface pressure between the lid 10 and the pulling nut 8. The tube 11 has a notch 12 on its side so that it can fit onto the outer diameter of the outer flange of various bottom brackets having different inner and outer diameters, and is equipped with an inner diameter adjustment mechanism that can change the band length using adjustment knobs 13 for multiple bands 21 installed on the left and right to expand or reduce the inner diameter.

[0017] Tool C, as shown in Fig. 2, is a modified version of tool A in Fig. 1. Tool A, which is an integrated type, is separated into a cylinder A31 and an arm body A32, and multiple arm bodies with different arm tip shapes can be inserted into the thin-diameter section 2 of the cylinder A31. Tool C is composed of the cylinder A31, arm body A32, arm body B33, a tapered pusher member 4 with the same outer diameter as the cylinder A31 for pushing the arm 3 outward, a spring 5 which is a pressing mechanism for applying pressure to the pusher member, a washer 6, and a pressing nut 7. Shapes 3a and 3b shown in Fig. 5 are suitable for the claws at the arm tips of the arm bodies, but other shapes are also possible.

[0018] The procedure in Figure 3 can be done very easily by one person. Loosen the pressing nut 7 of tool A in Figure 1 on the bottom bracket 14 that is press-fitted into the frame, and with the arms 3 closed inwards, insert the end of the pusher member in the direction of arrow 41 until it is flush with the outer side of the bottom bracket on the opposite side, then tighten the pressing nut 7 and apply pressure to the spring 5 and tapered pusher member 4, which causes the claws 3a at the ends of the multiple arms 3 to be pushed outwards and pressed against the inside of the waterproof tube 17 (see Figure 3(a)). In this state, when the tool A is moved in the removal direction, the claw 3a at the tip of the arm 3 slides inside the waterproof tube 17 and is guided to the flange 15 on the inside of the bottom bracket 14. In this state, the pressing nut 7 is further tightened so that the claw 3a at the tip of the arm 3 is securely fitted into the flange 15 (see FIG. 3(b)). Attach the tube 11 of tool B to the narrow-diameter side of tool A, and alternately turn the left and right adjustment knobs 13 to adjust so that there is no play between the outside diameter of the outer flange 18 of the press-fitted bottom bracket 14 and the inside diameter of the tube 11, and so that the gaps of the notched portions 12 are equal on the left and right. It is better to adjust it a little tighter. Attach the cover 10, thrust bearing 9, and extraction nut 8. (See Figure 3 (c)) When the removal nut 8 is tightened, pressure is applied to the tube 11, and the bottom bracket 14 is pulled outward and easily removed (see FIG. 3(d)). The use of the thrust bearing 9 makes it possible to tighten the extraction nut 8 easily with little force. In the very rare case that the waterproof tube 17 is not attached, insert the arm 3 from the outside of the bottom bracket on the side to be removed, from the end face of the tool A that has been machined to prevent rotation, in a horizontal position, not vertically but horizontally, until the tip of the claw is in the center of the crankshaft insertion part of the bottom bracket 14, tighten the pressing nut 7, and carefully push it in little by little, so that the claw 3a at the tip of the arm 3 fits into the inner flange 15 of the bottom bracket. In some cases, it is desirable to loosen the pressing nut 7 while pulling the thin part outward so that the tip of the claw does not come out of the inner flange of the bottom bracket, slide the spring 5 plunger member 4 towards the pressing nut 7, look inside the bottom bracket 14, and make sure that the claw 3a at the tip of the arm 3 is securely fitted into the inner flange 15 of the bottom bracket 14 before continuing the work. After checking, attach the tube 11, cover 10, thrust bearing 9, and pull-out nut 8, and adjust the inner diameter of the tube 11 using adjustment knob 13 so that it fits with the outer diameter of the outer flange of the bottom bracket. When the pull-out nut 8 is tightened, pressure is applied to the tube 11, and the bottom bracket 14 is pulled outward, allowing it to be easily removed.

[0019] In the case of a type in which the bearing 35 (see Fig. 2(c)) is directly pressed into the bottom bracket shell 16 of the frame, insert the arm body B33 into the cylindrical thin section 2 of tool C, position the arm 3 left and right (horizontally) instead of up and down, insert the tip 3b of the arm body B33 into the center of the thickness of the bearing 35 from the end face side where anti-rotation processing has been performed, tighten the pressing nut 7 to apply pressure to the tapered pusher member 4, and slowly push it in little by little until the claws 3b of the arm body B33 spread outwards and engage with the bearing 35. If the outer diameter of the cylinder A31 is thin compared to the inner diameter of the pressed-in bearing 35 and it is unstable due to wobbling, attaching an anti-rattle spacer 36 (see Fig. 2) to the cylinder A31 will eliminate the wobble. Next, the cylindrical tube 11 is attached and the left and right adjustment knobs 13 are used to adjust the gaps in the cutout portions 12 so that the inner diameter of the tube matches the inner diameter of the side of the bottom bracket shell of the frame, and the cover 10, thrust bearing 9 and extractor nut 8 are attached. While being careful not to let the tube 11 come off from the side of the bottom bracket shell of the frame, the extractor nut 8 is tightened and the bearing 35 is easily removed. [Explanation of symbols]

[0020] 1 Cylinder 2. Cylindrical thin section 3 Arm 4 Push-in parts 5. Spring 6 Washers 7 Pressing nut 8 Extraction nut 9 Thrust bearing 10 Lid 11 Cylindrical tube 12 Notch 13 Adjustment knob 14 Bottom bracket 15 Bottom bracket inner flange 16 Bottom bracket shell (frame) 17 Waterproof tube 18 Bottom bracket outer flange 21 Inner diameter adjustment band 31 Cylinder A 32 Arm Body A 33 Arm Body B 34 clips 35 Bearings 36 Anti-rattle spacer 3a Arm tip claw of arm body A 3b Arm tip claw of arm body B 41 Arrow

Claims

1. A tool for removing a press-fit type bottom bracket that is press-fitted into a bicycle frame, comprising: A cylinder having an outer diameter that can be inserted into the bottom bracket; a thin-diameter portion protruding coaxially from the center of one end face of the cylinder and having a male screw at a tip portion; A plurality of arms are provided on the one side of the cylinder in a state surrounding the small diameter portion; a pusher member having a through hole into which the thin diameter portion can be inserted and slidable relative to the thin diameter portion; a pressing mechanism for pressing the pusher member from the tip portion side to the arm side; Equipped with the arm has a claw that protrudes toward a side away from the small diameter portion when the arm tip is in a closed state, The arms are arranged so that, when closed, they are within the range of the cylinder as viewed in the axial direction of the cylinder, The tip of the pusher member has a tapered shape that decreases in diameter toward the arm side, When the pusher member is pushed by the pushing mechanism and slides toward the column, the arms are pushed apart by the tapered shape of the pusher member, a mechanism for rotating the tip of the arm around the base of the arm on one side of the cylinder in a direction away from the narrow diameter portion, said mechanism comprising:

2. A tool for removing a press-fit type bottom bracket that is press-fitted into a bicycle frame, comprising: A cylinder having an outer diameter that can be inserted into the bottom bracket; a thin-diameter portion protruding coaxially from the center of one end face of the cylinder and having a male screw at a tip portion; a detachable arm body having a cylindrical body having the same outer diameter as the cylindrical body, an insertion hole opening at the center of an end face into which the thin-diameter portion can be inserted, and a plurality of arms installed on one side of the cylindrical body in a state surrounding the thin-diameter portion when inserted; a pusher member having a through hole into which the thin diameter portion can be inserted and slidable relative to the thin diameter portion; a pressing mechanism for applying a pressure to the pusher member from the tip portion side to the arm body side; Equipped with When the arm body is fitted to the small diameter portion, each arm has a claw protruding toward a side away from the small diameter portion in a state where the arm tip portion is closed, Furthermore, each arm is installed so as to be contained within the range of the cylinder when viewed in the axial direction of the cylinder, a tip end of the pusher member has a tapered shape that decreases in diameter toward the arm tip side of the arm body, When the pushing mechanism pushes the pusher member and slides it toward the column, The arms are pushed apart by the tapered shape of the pusher member, A tool for removing a press-fit type bottom bracket of a bicycle frame, characterized in that the tip of the arm rotates around the arm base on one side of the arm body in a direction away from the thin diameter portion.

3. 3. An auxiliary tool for use with a press-fit type bottom bracket removal tool for a bicycle frame according to claim 1 or 2, A cylindrical tube with an inner diameter that fits the outer diameter of the flange on the outside of the bottom bracket. A cylindrical tube having a notch on a side surface, a plurality of bands wound in a ring shape around the outer periphery of the tube, and the tube having an inner diameter adjustment mechanism having an adjustment knob that allows the circumferential length of the bands to be changed; an extraction mechanism having a lid, a thrust bearing, and an extraction nut; Equipped with the tube has an inner diameter that can be enlarged or reduced by changing the circumferential length of the band with the adjustment knob, and can be fitted to an outer diameter of an outer flange of the bottom bracket that is press-fitted into the bicycle frame; An auxiliary tool that enables removal of the bottom bracket by attaching the removal tool to the bottom bracket, inserting the tube, the lid, and the thrust bearing into the thin-diameter portion of the removal tool from the thin-diameter side of the removal tool, and screwing the extraction nut onto the thread of the thin-diameter portion so that pressure is applied to the tube.

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