Telescopic crank for bicycle

Abstract

The utility model relates to the technical field of bicycle cranks, and discloses a telescopic crank for a bicycle, which solves the problem that the existing bicycle crank is difficult to adapt to different people due to unadjustable length, and comprises a main shaft, a crank tube is fixed on the main shaft, and a crank rod is movably sleeved in the crank tube. The outer side of the crank rod is rotationally connected with a pedal plate, an adjusting mechanism is installed between the crank rod and the crank pipe, a limiting mechanism is installed on the adjusting mechanism, and the adjusting mechanism comprises an inner plate fixed in the crank pipe; according to the utility model, through the cooperation among the rotating shaft, the gear and the toothed plate, the sleeve plate can slide along the guide rod conveniently when the turntable is rotated, and through the cooperation among the side plate, the guide rod, the inner plate and the connecting column, the crank rod can slide along the length direction of the crank tube conveniently, so that the length of the part of the crank rod outside the crank tube can be changed; and therefore, the length of the whole crank can be conveniently adjusted to adapt to different people.

Description

Technical Field

[0001] The utility model belongs to the technical field of bicycle cranks, in particular to a telescopic crank for a bicycle. Background Art

[0002] The crank of a bicycle is a key component that connects the pedals and the chainrings. Specifically, the crank is installed on the chainring shaft to connect the pedals and the chainrings, and drives the rotation of the chainrings through the up and down movement of the pedals, thereby moving the bicycle forward. The design of the crank allows the rider to convert force into bicycle power through the pedaling action.

[0003] Most of the existing bicycle cranks are of integral structure, and their length cannot be adjusted, so they are less universal when used by different groups of people. Utility Model Content

[0004] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a telescopic crank for a bicycle, which effectively solves the problem that the length of the current bicycle crank cannot be adjusted, making it difficult to adapt to different groups of people.

[0005] To achieve the above object, the utility model provides the following technical solutions: a telescopic crank for a bicycle, comprising a main shaft, a crank tube fixed on the main shaft, a crank rod movably sleeved inside the crank tube, a pedal rotatably connected to the outside of the crank rod, an adjustment mechanism installed between the crank rod and the crank tube, and a limit mechanism installed on the adjustment mechanism;

[0006] The adjusting mechanism includes an inner plate fixed to the inside of the crank tube, a guide rod is fixedly installed between the side of the inner plate away from the crank rod and the inner wall of the crank tube, a sleeve plate is movably sleeved on the outer side of the guide rod, a side plate is fixedly installed on the side of the sleeve plate close to the inner plate, the side plate is movably sleeved on the outer side of the guide rod, two connecting columns are symmetrically fixedly connected between the side plate and the crank rod, and the two connecting columns both penetrate the inner plate and are movably connected to the inner plate.

[0007] Preferably, the crank tube is rotatably connected to a rotating shaft inside, a turntable is fixedly installed at one end of the rotating shaft, the rotating shaft is located above the sleeve plate, a gear is fixedly installed on the outside of the rotating shaft, a toothed plate is fixedly installed on the top of the sleeve plate, and the toothed plate is meshingly connected with the gear.

[0008] Preferably, the limiting mechanism includes a mounting plate fixed to the side of the inner plate away from the crank rod, the side of the mounting plate away from the inner plate is fixedly connected to the inner wall of the crank tube, a sliding groove is provided on the mounting plate, a side of the sleeve plate close to the mounting plate is rotatably connected to a support column, an end of the support column away from the sleeve plate is fixedly installed with the mounting column, a sleeve is movably sleeved on the outer side of the mounting column, the sleeve passes through the sliding groove, a spring is fixedly connected between the sleeve and the support column, the spring is sleeved on the outer side of the mounting column, a mounting block is fixedly installed on the end of the sleeve away from the support column, the mounting block is located on the side of the mounting plate away from the sleeve plate, a plug rod is fixedly installed on the side of the mounting block close to the mounting plate, and holes are equidistantly provided on the side of the mounting plate close to the mounting block, and the plug rod is inserted into the corresponding hole.

[0009] Preferably, a side groove is provided on the outer side of the sleeve, a side block is slidably connected in the side groove, and the side block is fixed to the outer side of the mounting column.

[0010] Preferably, a positioning cylinder is fixedly mounted on the bottom of the sleeve plate, and the inner diameter of the positioning cylinder is equal to the outer diameter of the insertion rod.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] (1) The utility model facilitates the sliding of the sleeve plate along the guide rod when the turntable is rotated through the cooperation between the rotating shaft, the gear and the toothed plate, and facilitates the sliding of the crank rod along the length direction of the crank tube through the cooperation between the side plate and the guide rod and the inner plate and the connecting column, thereby changing the length of the crank rod located outside the crank tube, thereby facilitating the adjustment of the length of the entire crank to suit different groups of people;

[0013] (2) The new type facilitates the movement and rotation of the mounting block by cooperating between the support column and the mounting column as well as the sleeve and the spring, thereby enabling the insertion rod to be inserted into the corresponding insertion hole, and fixing the sleeve plate and the mounting plate, thereby facilitating the fixing of the crank rod and the crank tube to prevent the crank rod from moving arbitrarily. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0015] In the attached picture:

[0016] Figure 1 This is a schematic diagram of the structure of a telescopic crank for a bicycle of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the adjustment mechanism of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the limiting mechanism of the utility model;

[0019] Figure 4 This is a schematic diagram of the sleeve structure of the utility model;

[0020] In the figure: 1. main shaft; 2. adjusting mechanism; 201. inner plate; 202. sleeve plate; 203. turntable; 204. guide rod; 205. tooth plate; 206. gear; 207. rotating shaft; 208. side plate; 209. connecting column; 3. limiting mechanism; 301. mounting plate; 302. positioning cylinder; 303. sleeve; 304. slide groove; 305. socket; 306. mounting block; 307. plug rod; 308. side block; 309. side groove; 3010. spring; 3011. support column; 3012. mounting column; 4. crank tube; 5. crank rod; 6. pedal. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] Embodiment 1, by Figure 1 The utility model comprises a main shaft 1, on which a crank tube 4 is fixed, a crank rod 5 is movably sleeved inside the crank tube 4, a pedal 6 is rotatably connected to the outer side of the crank rod 5, an adjusting mechanism 2 is installed between the crank rod 5 and the crank tube 4, and a limiting mechanism 3 is installed on the adjusting mechanism 2.

[0023] Specifically, by Figure 2 It is given that the adjustment mechanism 2 includes an inner plate 201 fixed to the inside of the crank tube 4, a guide rod 204 is fixedly installed between the side of the inner plate 201 away from the crank rod 5 and the inner wall of the crank tube 4, a sleeve plate 202 is movably sleeved on the outer side of the guide rod 204, a side plate 208 is fixedly installed on the side of the sleeve plate 202 close to the inner plate 201, the side plate 208 is movably sleeved on the outer side of the guide rod 204, two connecting columns 209 are symmetrically fixedly connected between the side plate 208 and the crank rod 5, the two connecting columns 209 both penetrate the inner plate 201 and are movably connected to the inner plate 201, a rotating shaft 207 is rotatably connected to the inside of the crank tube 4, a rotating disk 203 is fixedly installed on one end of the rotating shaft 207, the rotating shaft 207 is located above the sleeve plate 202, a gear 206 is fixedly installed on the outer side of the rotating shaft 207, a toothed plate 205 is fixedly installed on the top of the sleeve plate 202, and the toothed plate 205 is meshingly connected with the gear 206;

[0024] When in use, first rotate the turntable 203 to drive the rotation of the shaft 207 and the gear 206. Since the gear 206 is meshed and connected with the tooth plate 205, the sleeve plate 202 is driven to slide along the guide rod 204, and the side plate 208 is driven to slide along the guide rod 204. Then, the crank rod 5 is driven to move along the length direction of the crank tube 4 through the two connecting columns 209, thereby changing the length of the crank rod 5 located on the outer side of the crank tube 4. Finally, the length of the entire crank is adjusted to suit different people.

[0025] Specifically, by Figure 3-4 It is given that the limiting mechanism 3 includes a mounting plate 301 fixed to the side of the inner plate 201 away from the crank rod 5, the side of the mounting plate 301 away from the inner plate 201 is fixedly connected to the inner wall of the crank tube 4, a sliding groove 304 is provided on the mounting plate 301, a support column 3011 is rotatably connected to the side of the sleeve plate 202 close to the mounting plate 301, a mounting column 3012 is fixedly installed on the end of the support column 3011 away from the sleeve plate 202, a sleeve 303 is movably sleeved on the outer side of the mounting column 3012, the sleeve 303 passes through the sliding groove 304, a spring 3010 is fixedly connected between the sleeve 303 and the support column 3011, the spring 3010 is sleeved on the outer side of the mounting column 3012, and a mounting block 306 is fixedly installed on the end of the sleeve 303 away from the support column 3011. The mounting block 306 is located on the side of the mounting plate 301 away from the sleeve plate 202. The mounting block 306 is fixedly installed with an insertion rod 307 on the side close to the mounting plate 301. The mounting plate 301 is equidistantly provided with insertion holes 305 on the side close to the mounting block 306. The insertion rod 307 is inserted into the corresponding insertion hole 305. The outer side of the sleeve 303 is provided with a side groove 309. The side block 308 is slidably connected in the side groove 309. The side block 308 is fixed to the outer side of the mounting column 3012. By arranging the side block 308 in the side groove 309 and fixing the side block 308 on the outer side of the mounting column 3012, the sleeve 303 and the mounting column 3012 can be rotated simultaneously. The bottom of the sleeve plate 202 is fixedly installed with a positioning cylinder 302. The inner diameter value of the positioning cylinder 302 is equal to the outer diameter value of the insertion rod 307.

[0026] When in use, the rod 307 is initially inserted into the positioning tube 302, so that the sleeve 202 and the mounting plate 301 are not fixed, which facilitates the sleeve 202 to slide along the guide rod 204. When the sleeve 202 stops sliding, the mounting block 306 is then pulled to drive the sleeve 303 to slide along the mounting column 3012. At this time, the spring 3010 is stretched until the rod 307 is removed from the positioning tube 302, and then the mounting block 306 is rotated 180°, and then the mounting block 306 is pushed, and under the action of the elastic force of the spring 3010, the rod 307 is inserted into the corresponding socket 305 to fix the sleeve 202 and the mounting plate 301, and finally the crank rod 5 and the crank tube 4 are fixed to prevent the crank rod 5 from moving arbitrarily.

Claims

1. A telescopic crank for a bicycle, comprising a main shaft (1), characterized in that: A crank tube (4) is fixed on the main shaft (1), a crank rod (5) is movably sleeved inside the crank tube (4), a pedal (6) is rotatably connected to the outside of the crank rod (5), an adjustment mechanism (2) is installed between the crank rod (5) and the crank tube (4), and a limit mechanism (3) is installed on the adjustment mechanism (2); The adjustment mechanism (2) comprises an inner plate (201) fixed inside the crank tube (4); a guide rod (204) is fixedly installed between the side of the inner plate (201) away from the crank rod (5) and the inner wall of the crank tube (4); a sleeve plate (202) is movably sleeved on the outer side of the guide rod (204); a side plate (208) is fixedly installed on the side of the sleeve plate (202) close to the inner plate (201); the side plate (208) is movably sleeved on the outer side of the guide rod (204); two connecting columns (209) are symmetrically fixedly connected between the side plate (208) and the crank rod (5); the two connecting columns (209) both penetrate the inner plate (201) and are movably connected to the inner plate (201).

2. A telescopic crank for a bicycle according to claim 1, characterized in that: The crank tube (4) is rotatably connected to a rotating shaft (207) at one end of which a rotating disk (203) is fixedly mounted. The rotating shaft (207) is located above the sleeve plate (202). A gear (206) is fixedly mounted on the outer side of the rotating shaft (207). A toothed plate (205) is fixedly mounted on the top of the sleeve plate (202). The toothed plate (205) is meshingly connected to the gear (206).

3. A telescopic crank for a bicycle according to claim 1, characterized in that: The limiting mechanism (3) comprises a mounting plate (301) fixed to a side of the inner plate (201) away from the crank rod (5); the side of the mounting plate (301) away from the inner plate (201) is fixedly connected to the inner wall of the crank tube (4); a slide groove (304) is provided on the mounting plate (301); a support column (3011) is rotatably connected to a side of the sleeve plate (202) close to the mounting plate (301); a mounting column (3012) is fixedly installed at one end of the support column (3011) away from the sleeve plate (202); a sleeve (303) is movably sleeved on the outer side of the mounting column (3012); the sleeve (303) passes through the slide groove (304); A spring (3010) is fixedly connected between the sleeve (303) and the support column (3011), and the spring (3010) is sleeved on the outer side of the mounting column (3012). A mounting block (306) is fixedly installed on the end of the sleeve (303) away from the support column (3011), and the mounting block (306) is located on the side of the mounting plate (301) away from the sleeve plate (202). An insertion rod (307) is fixedly installed on the side of the mounting block (306) close to the mounting plate (301), and holes (305) are equidistantly provided on the side of the mounting plate (301) close to the mounting block (306), and the insertion rod (307) is inserted into the corresponding hole (305).

4. A telescopic crank for a bicycle according to claim 3, characterized in that: The outer side of the sleeve (303) is provided with a side groove (309), and a side block (308) is slidably connected in the side groove (309), and the side block (308) is fixed to the outer side of the mounting column (3012).

5. The telescopic crank for a bicycle according to claim 1, characterized in that: A positioning tube (302) is fixedly mounted on the bottom of the sleeve plate (202), and the inner diameter of the positioning tube (302) is equal to the outer diameter of the insertion rod (307).

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