Hollow bolt-mounted telescopic pedal

Abstract

The invention discloses a hollow bolt mounted telescopic pedal which is mounted by screwing a hollow bolt into a crank hole, and a telescopic shaft penetrates into an inner hole. The treading force is lifted by the bolt section in the radial direction of the shaft and pressed downwards by the threaded section, and a lever type stress structure is formed. The pedal can stretch out and draw back through foot control, the pedal is installed when leaving a factory, the situation that the pedal is installed by an employee in sales is avoided, labor cost is saved, the packaging material volume is effectively saved, and the experience that a user can directly try to ride is met. A bearing is not needed, the cost of the pedal is reduced, and the pedal can be applied to a folding bicycle in a large scale and can replace an existing folding pedal.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle foot accessories, and particularly to a telescopic footrest installed with a hollow bolt for a bicycle. Background Art

[0002] Traditional bicycle footrests usually adopt a fixed structure, where the footrest shaft is fixedly screwed to the crank and the length cannot be adjusted. The footrests are not installed when the bicycle leaves the factory to reduce the packaging and transportation volume. The existing folding footrests on the market mainly connect the pedal to the shaft through bearings, and the shaft is screwed to the crank. The pedal is folded by flipping or disassembling to reduce the packaging and carrying volume of the bicycle. This method requires manual operation, and users are reluctant to touch the dirty footrests with their hands. Summary of the Invention

[0003] The present invention aims to solve the deficiencies in the prior art and provides a telescopic footrest installed with a hollow bolt, which can be installed when the vehicle leaves the factory, can be manipulated with a single foot to reduce the volume, is convenient for transportation and carrying, and customers in the store can directly test ride.

[0004] The technical solution of the present invention adopts a hollow structure in which the hollow bolt is composed of a bolt section and a threaded section, and a telescopic shaft is inserted into the inner hole. The threaded section is used for installation and is screwed to the crank hole. The pedaling force is supported by the bolt section in the radial direction of the shaft and pressed down by the threaded section to form a lever-like force structure. One end of the shaft is provided with a step, which is blocked by the hollow bolt when extending out to limit its detachment.

[0005] The threaded section extends out elastic claws to form an inner shoulder structure; the claws act on the step of the shaft to limit the axial movement; a certain force needs to be applied to make the elastic claws bounce up to allow the shaft to retract.

[0006] The step of the shaft is a groove structure, and a retaining ring is installed to be blocked by the inner shoulder to form axial limitation. Two inclined conical surfaces are provided inside the elastic claws and are in sliding fit with the tapered step of the shaft, so that the anti-retraction force of the shaft is greater than the extension force.

[0007] The outer ring of the hollow bolt is pivotally connected to the inner arm of the pedal, and the inner hole penetrates the shaft fixed on the outer arm. The outer arm of the pedal is connected to the inner arm through a multi-link to form a telescopic footrest structure that can limit the shaft from being pulled off. Or the pedal is hinged by multiple arms to form a link structure, so that the footrest can cooperate with the shaft to expand and contract. The pedal is integrally formed and has a self-contained bent groove elastic telescopic structure to achieve the limitation of the shaft. The pedal is injection molded, and the shaft is directly pressed into the hole on the outer arm to achieve a screw-free fixing method.

[0008] The pedal adopts a horizontally retractable structure to limit the telescopic shaft from being pulled out. The hollow bolt and the pedal and the shaft form a bearing structure, which becomes the inner ring of the pedal and the outer ring of the shaft. The outer ring of the hollow bolt bears half of the pedaling force of the pedal.

[0009] Grooves for storing lubricants are arranged at the inner holes of the bolt section and the threaded section of the hollow bolt. The shaft is coated with a self-lubricating coating.

[0010] When the space needs to be reduced for transport and storage of bicycles, the pedals can be retracted by stepping on the outside of the pedals and applying an axial thrust of more than about 10 kg. The pedals can be extended by stepping on the pedal axle head or hooking the pedals outward by about 1 kg.

[0011] Beneficial effects of the present invention: 1. The pedals are installed at the factory, eliminating the need for shop installation and saving labor costs; 2. No bearings are required, which reduces the cost and weight of the pedals; 3. No manual operation required. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a part diagram of a hollow bolt according to an embodiment of the present invention; Figure 2 This is a shaft parts diagram of an embodiment of the present invention; Figure 3 This is a diagram of the installation structure of a hollow bolt and a shaft according to an embodiment of the present invention; Figure 4 It is a partial enlarged view of the elastic claw and shaft structure of the first embodiment of the present invention; Figure 5 This is a schematic diagram of the telescopic installation of a footrest according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the pedaling force axis load of the present invention; Figure 7 This is a diagram of the installation of a hollow bolt and a grooved shaft according to the second embodiment of the present invention; Figure 8 This is a diagram of a hollow bolt with an outer ring groove according to Embodiment 3 of the present invention; Figure 9 It is a structural diagram of a telescopic footrest of a multi-arm pedal according to embodiment three of the present invention.

[0013] Among them: 1. hollow bolt; 2. bolt section; 21. outer ring groove; 3. threaded section; 4. elastic claw; 41. hammer head; 42. entry oblique cone surface; 43. exit oblique cone surface; 44. inner shoulder; 5. groove; 6. shaft; 61. step; 62. groove; 63. shaft shoulder; 64. shaft head; 7. retaining ring; 8. pedal; 81. curved groove; 82. outer arm; 83. inner arm; 84. cantilever; 9. crank. DETAILED DESCRIPTION

[0014] In the description of the present invention, it should be understood that the term "section" refers to a functional section and does not limit the length accuracy. The "crank hole" refers to the hole for installing the pedal. The "pedaling force" refers to the pedal load. The "step" refers to the outer diameter with a size difference from the spindle diameter. "Self-lubrication" refers to a method of increasing the hardness of the material surface or including reducing the friction coefficient. In the embodiments, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device referred to must have a specific orientation or accuracy, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. Adopting the concept of the present invention belongs to the protection scope of the present invention.

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Embodiment 1: Refer to the attached Figure 1 As shown, the hollow bolt (1) is composed of a bolt section (2) and a threaded section (3) with a similar length.

[0016] Attached Figure 2 As shown, the right end of the shaft (6) is provided with a concave-convex taper step structure, and the left end is provided with a concave-convex groove structure for inserting and fixedly connecting the outer arm (82) of the pedal.

[0017] Attached Figures 3 - 4 As shown, the hollow bolt installs a telescopic pedal, and the inner hole of the hollow bolt (1) penetrates the telescopic shaft (6). One end of the shaft (6) is provided with a taper step (61) for sliding cooperation with the inlet inclined cone surface (42) and the outlet inclined cone surface (43) of the hollow bolt (1). When extending, it is blocked by the hollow bolt (1) to form an axial limit and prevent it from falling off.

[0018] Attached Figure 4 is a partial enlarged view. The threaded section (3) extends out an elastic claw (4), and only the lateral schematic diagram of one claw is drawn in the figure. A plurality of claws are evenly distributed in the circumferential direction, and the hammer head (41) is embedded at the stepped groove (62) of the shaft (6) and acts on the step of the shaft (6) to limit the axial movement. Only when a certain force is applied can the hammer head (41) of the elastic claw (4) bounce up (see the dotted line) to let the shaft retract.

[0019] The elastic claw (4) is provided with two inclined cone surfaces for sliding cooperation with the taper step of the shaft (6), so that the anti-retraction force of the shaft (6) is greater than the extension force. Preferably, the extension force is set to about 1 kg; the retraction force is set to about 10 kg.

[0020] The threaded section extends out an elastic claw (4) to form an inner shoulder (44) structure.

[0021] Attached Figure 5As shown in the figure below, the following is the installation structure of the telescopic footrest in the pedalable state during cycling. When the foot steps on the outside of the pedal (8) to retract the shaft (6), see the figure above. The length of the threaded section (3) of the hollow bolt is close to the thickness of the crank (9). The threaded section is used for screwing into the hole of the crank (9), and the bolt section is exposed outside the crank.

[0022] Attached Figure 6 As shown, when the threaded section is screwed into the hole of the crank (9), the pedaling force is supported by the bolt section in the radial direction of the shaft (6) and pressed down by the crank (9) section, forming a lever-type force structure. The downward arrow on the left represents the pedaling force load of the rider. The upward arrow in the middle represents the lifting force, and the arrow indicates the center point of the lifting force; the downward arrow on the right represents the schematic diagram of the downward pressure, and the arrow indicates the center point of the downward pressure.

[0023] Embodiment 2, Figure 7 As shown, the step of the shaft (6) is a groove (62) structure, and the retaining ring (7) is used to block the inner shoulder (44) for the installation shaft to achieve axial limit.

[0024] Embodiment 3, Attached Figure 8 As shown, the bolt section of the hollow bolt (1) is provided with an outer ring groove (21) for pivotally connecting with the rotating bearing of the pedal (8).

[0025] Attached Figure 9 As shown, the pedal (8) adopts a multi-link structure, and multiple cantilevers (84) are hinged to each other to form a link structure (figure omitted). The outer cantilever (82) on the left side of the figure is fixed to the shaft; the inner cantilever (83) on the right side is rotatably connected to the outer ring groove (21). The pedal (8) is preferably integrally injection-molded, and elastic bending grooves (81) are provided at the joints of the multiple cantilevers (84). The pedal (8) is at least composed of an outer cantilever (82) and an inner cantilever (83), and the two sides are respectively connected by two cantilevers (84) to form a laterally retractable structure to achieve axial limit. It is the same as the principle of the four-link structure.

[0026] The shaft can be directly pressed into the hole of the outer cantilever (82) to achieve a screwless installation structure. The multi-link pedal (8) forms a stable structure when stepped on by the sole of the foot, restricting the telescoping of the footrest and keeping the pedal in a stable extended working state.

[0027] The hollow bolt (1) forms a bearing structure with the pedal (8) and the shaft (6). The hollow bolt (1) becomes the inner ring of the pedal (8) and the outer ring of the shaft.

[0028] A self-lubricating coating is applied to the radial direction of the shaft, including PVD, electroplating, and coating-type Teflon materials, which are low-loss superhard materials with a reduced friction coefficient.

[0029] A groove (5) for storing lubricant is provided in the middle of the inner cavity of the hollow bolt (1); one side of the groove is a bolt section, and the other side is a threaded section. Lubricant, such as molybdenum disulfide, with a friction coefficient as low as 0.05, which is basically equivalent to that of a heavy-duty ball bearing, is filled into the groove (5), which can effectively improve the service life of the shaft.

Claims

1. A hollow bolt mounted telescopic footrest, comprising a hollow bolt and a shaft, characterized in that: The hollow bolt is composed of a bolt section and a threaded section to form a hollow structure, and a retractable shaft is inserted into the inner hole; The threaded section is used for installation, and the pedaling force is lifted by the bolt section in the radial direction of the shaft and pressed down by the threaded section, forming a lever-type force-bearing structure; One end of the shaft is provided with a step, which is blocked by the hollow bolt when the shaft is extended, thereby preventing the shaft from falling off.

2. The hollow bolt mounted telescopic footrest according to claim 1, characterized in that: The threaded section extends an elastic claw to form an inner shoulder structure; the claw acts on the step of the shaft to limit the axial movement; a certain force is applied to make the elastic claw pop up and allow the shaft to retract.

3. The hollow bolt mounted telescopic footrest according to claim 1, characterized in that: The step of the shaft is a groove structure, and a retaining ring is installed to be blocked by the inner shoulder to form an axial limit.

4. The hollow bolt mounted telescopic footrest according to claim 2, characterized in that: The elastic claw is provided with two oblique conical surfaces, which are slidably matched with the taper step of the shaft, so that the anti-retraction force of the shaft is greater than the extension force.

5. A hollow bolt mounted telescopic footrest, comprising a hollow bolt, a shaft, and a pedal, characterized in that: The outer ring of the hollow bolt is pivotally connected to the inner arm of the pedal, and the inner hole is penetrated by a shaft fixed to the outer arm; The pedal outer arm is connected with the inner arm via a multi-link to form a telescopic pedal structure capable of preventing the shaft from being pulled off.

6. The hollow bolt mounted telescopic footrest according to claim 5, characterized in that: The pedal is integrally formed and has a curved groove elastic telescopic structure.

7. The hollow bolt mounted telescopic footrest according to claim 5, characterized in that: The pedal is injection molded, and the shaft is directly pressed into the outer arm and fixed.

8. The hollow bolt mounted telescopic footrest according to any one of claims 1 to 7, characterized in that: Grooves for storing lubricant are arranged at the inner holes of the bolt section and the threaded section of the hollow bolt.

9. The hollow bolt mounted telescopic footrest according to any one of claims 1 to 7, characterized in that: The shaft is coated with a self-lubricating coating.

Images