Pulley device, shoe sole, and pulley extension and retraction operation method

Abstract

The present invention relates to the field of footwear technology, and specifically discloses a pulley device, a sole, and a pulley extension and retraction operation method. No cover is required, and the pulley assembly can be retracted with one hand or two hands. The pulley assembly can be quickly and conveniently disassembled, safely, and reliably. The pulley device includes: a wheel seat having a receiving cavity, an installation cavity, an installation slot, and a limiter; a switch assembly including a switch plate with a switch hole; a pulley assembly including a central axis and a control block, the control block being sleeved on the central axis and having a first retracted portion, a second retracted portion, an upper stop, and a lower stop. When the switch plate is in a disassembly position, the control block moves in and out of the switch hole as a whole to disassemble and assemble the pulley assembly. When the switch plate is in a locking position, the switch plate is engaged with the first retracted portion to cause the pulley assembly to protrude from the wheel seat, or engaged with the second retracted portion to cause the pulley assembly to retract into the wheel seat. When the switch plate is in a retracting position, the control block rises and falls in the switch hole, and the switch plate blocks the upper stop and the lower stop.

Description

Technical Field

[0001] The present invention relates to the technical field of footwear, and in particular to a pulley device, a shoe sole and a pulley extension and retraction operation method. Background Art

[0002] Rolling shoes are sports shoes that can switch between roller skating and walking modes by retracting a pulley assembly. They are generally constructed by installing and fixing a pulley device on the heel of an ordinary sole. The pulley device includes a wheel seat and a pulley assembly for the sole. A common pulley assembly generally consists of a central shaft and two wheel bodies that are axially fixed and circumferentially rotatably mounted on both ends of the central shaft through ball bearings. The wheel seat is provided with a wheel body accommodating cavity for accommodating the pulley assembly and a blocking cover for blocking the pulley assembly from running out of the wheel body accommodating cavity. The blocking cover blocks the central shaft and cooperates with a switch assembly on the wheel seat to keep the pulley assembly in a protruding roller skating state. The switch assembly on the wheel seat is used to keep the pulley assembly in a retracted walking state, for example, Chinese patent document CN207024593U.

[0003] When retracting this type of pulley assembly into the wheel seat to switch to walking mode, the only way is to press the two wheels with both hands. Furthermore, the stability of the cover installation structure is extremely high, because when switching to the protruding wheel skating state, the cover is used to absorb the impact and limit the central axis. Due to the existence of the central axis, the cover needs to be opened when installing the pulley assembly into the wheel seat to allow the central axis to enter the wheel body cavity. Therefore, the cover and wheel seat can only be fixed with a split, detachable structure, such as screw locking. If not properly maintained over time, the cover may fall off and cause an accident.

[0004] In addition, in the prior art, when installing or removing the pulley assembly, it is necessary to first release the fixed relationship between the cover and the wheel seat before the central axis of the pulley assembly can be moved in and out. After the pulley assembly is moved in and out, it is necessary to use tools to reset the cover and fix it on the wheel seat again, so disassembly and assembly are inconvenient. Summary of the Invention

[0005] The purpose of the present invention is to provide a pulley device, a sole and a pulley extension and retraction operation method, which does not require a cover and can retract the pulley assembly with one hand or both hands. At the same time, the disassembly and assembly steps of the pulley assembly are simplified, which is quick, convenient, safe and reliable.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] Pulley device, comprising:

[0008] A wheel seat, wherein the wheel seat is provided with a receiving cavity with a bottom opening and a mounting cavity with a rear opening, the mounting cavity is arranged to extend frontward and rearward and is in communication with the receiving cavity, and a mounting groove and a stopper detachably engaged in the mounting groove are provided above the rear opening of the mounting cavity on the rear side of the wheel seat;

[0009] The switch assembly includes a switch plate with a switch hole and a return member for returning the switch plate, wherein the switch plate is slidably fitted in the mounting cavity and a rear end of the switch plate extends out of the mounting cavity, and the rear end of the switch plate has a stop portion that protrudes upward and movably abuts against the limit member;

[0010] The pulley assembly includes a central shaft, a control block, and two wheel bodies respectively fixed axially and rotatably arranged at both ends of the central shaft, the control block being sleeved on the central shaft between the two wheel bodies, the wheel body protruding downward relative to the bottom end of the control block, the pulley assembly being lifted and lowered in the accommodating cavity, and a pop-up member being installed between the top wall of the accommodating cavity and the control block, a first constricted portion located at the upper part of the control block and a second constricted portion located at the lower part of the control block being arranged at intervals on the circumference of the control block, and the control block is further provided with an upper stop portion above the first constricted portion and a lower stop portion below the second constricted portion;

[0011] The switch plate has a locking working position in which the rear end of the switch plate is away from the limit member, a telescopic working position in which the rear end of the switch plate abuts the limit member, and a disassembly working position in which the switch plate slides forward to the front end after the limit member is removed. When the switch plate is in the disassembly working position, the control block as a whole enters and exits the switch hole to disassemble and assemble the pulley assembly. When the switch plate is in the locking working position, the switch plate is clamped at the first contraction portion to cause the pulley assembly to protrude from the wheel seat, or is clamped at the second contraction portion to cause the pulley assembly to retract into the wheel seat. When the switch plate is in the telescopic working position, the portion of the control block located between the first contraction portion and the second contraction portion rises and falls in the switch hole, and the switch plate blocks the upper stop portion and the lower stop portion.

[0012] Preferably, the mounting cavity passes through the wheel seat front to back, the switch assembly further comprises a stopper, the stopper is fixedly arranged at the front opening of the mounting cavity, the return member is arranged in the mounting cavity behind the stopper, and the front end of the switch plate abuts against the return member.

[0013] Preferably, the installation cavity includes two wheel cavities respectively configured corresponding to the wheel body and an intermediate cavity located between the two wheel cavities and configured corresponding to the control block. The left and right sides of the intermediate cavity are respectively connected to the wheel cavity on the corresponding side through vertical holes. The central axis rises and falls in the vertical holes, and the bottom of the vertical holes is open.

[0014] Preferably, a guide groove is provided on the side surface of the control block, and a guide bar is protruded at a position of the intermediate cavity corresponding to the guide groove, and the guide bar is slidably engaged with the guide groove.

[0015] Preferably, the control block between the first constricted portion and the second constricted portion is configured as an intermediate column, wherein the intermediate column has an upper end and a lower end;

[0016] The lower stop is located below the middle column and is sleeved on the central axis between the two wheel bodies. The upper end of the lower stop has a lower stop position that protrudes relative to the lower end of the middle column.

[0017] The upper stop is located above the middle column, the orthographic projection of the cross-sectional shape of the upper stop at any height on the lower end of the upper stop is within the contour line of the lower end of the upper stop, the orthographic projection of the lower end of the upper stop on the upper end of the lower stop is within the contour line of the upper end of the lower stop, the orthographic projection of the cross-sectional shape of the middle column at any height on the lower end of the upper stop falls within the contour line of the lower end of the upper stop, and the lower end of the upper stop has an upper stop position that protrudes relative to the upper end of the middle column;

[0018] The first constricted portion is located between the middle column and the upper stop portion, the orthographic projection of the first constricted portion on the upper end of the middle column falls within the contour line of the upper end of the middle column, the upper end of the middle column has an upper flange protruding relative to the first constricted portion, and the orthographic projection of the first constricted portion on the lower end of the upper stop portion falls within the contour line of the lower end of the upper stop portion;

[0019] The second constricted portion is located between the middle column and the lower stop, the orthographic projection of the second constricted portion on the lower end of the middle column falls within the contour line of the lower end of the middle column, the lower end of the middle column has a lower flange protruding relative to the second constricted portion, and the orthographic projection of the second constricted portion on the upper end of the lower stop falls within the contour line of the upper end of the lower stop;

[0020] The left and right side walls of the first constricted portion and the left and right side walls of the second constricted portion are both straight side walls extending in parallel along the front-to-back direction.

[0021] Preferably, the middle column is a straight column that is smaller in the front and larger in the back, having a first curved surface located on the front side of the middle column, a second curved surface located on the back side of the middle column, and transition surfaces located on the left and right sides of the middle column and connecting the first curved surface and the second curved surface front and back. The width of the rear end of the first curved surface in the left and right directions is greater than the width of the front end of the second curved surface in the left and right directions, and the width of the transition surface in the left and right directions increases from the rear end of the first curved surface to the front end of the second curved surface on the same side.

[0022] Preferably, the orthographic projection of the first curved surface on the lower end of the upper stop portion is retracted relative to the contour line corresponding to the lower end of the upper stop portion, and an upper stop position is formed at the position of the transition surface and the first curved surface corresponding to the lower end of the upper stop portion; the orthographic projection of the first curved surface on the upper end of the lower stop portion is retracted relative to the contour line corresponding to the upper end of the lower stop portion, and a lower stop position is formed at the position of the transition surface and the first curved surface corresponding to the lower end of the lower stop portion.

[0023] Preferably, the first necking portion is retracted relative to the first curved surface and the transition surface, the second necking portion is retracted relative to the first curved surface and the transition surface, an upper flange is formed at the upper end of the intermediate column corresponding to the position of the first curved surface and the transition surface, and a lower flange is formed at the lower end of the intermediate column corresponding to the position of the first curved surface and the transition surface.

[0024] The present invention also provides a sole, including a sole body and the above-mentioned pulley device, wherein the pulley device is installed on the heel of the sole body, and the rear side of the sole body is provided with a mounting hole and a pressing block movably inserted into the mounting hole, and the pressing block cooperates with the switch plate.

[0025] The present invention further provides a pulley extension and retraction operation method, wherein a switch assembly and a pulley assembly are configured to cooperate with each other on a wheel seat, and the pulley assembly is lifted and retracted by a control block thereon, and a first constricted portion and a second constricted portion are provided at intervals on the circumference of the control block, and an upper stop portion is provided above the first constricted portion and a lower stop portion is provided below the second constricted portion. The switch assembly has a locking working position and a retracting working position. The pulley extension and retraction operation method is as follows:

[0026] In the initial state, the switch assembly is engaged with the second retracted portion on the control block. At this time, the switch assembly is in the locked working position, and the pulley assembly is retracted into the wheel seat;

[0027] Applying pressure to the switch assembly causes the switch assembly to move from the locked working position to the retracted working position, and the control block moves downward. When the control block moves to the first retracted portion corresponding to the position of the switch assembly, it is stopped by the upper stop portion, and the switch assembly returns to the locked working position. At this time, the switch assembly is snap-fitted into the first retracted portion, and the pulley assembly protrudes from the wheel seat.

[0028] Then, pressure is applied to the switch assembly to move it to the telescopic working position and maintain it in the telescopic working position. Then, pressure is applied to the control block with one hand or to the two wheels with both hands to move the control block upward. When the control block moves to the second retracted portion corresponding to the position of the switch assembly, it is blocked by the lower stop portion and the switch assembly returns to the locked working position. At this time, the switch assembly is snap-fitted into the second retracted portion and returns to the initial state.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The pulley device of the present invention includes a wheel seat, a switch assembly, and a pulley assembly. The pulley assembly includes a control block mounted on a central axis. The control block is provided with a first constricted portion, a second constricted portion, an upper stop, and a lower stop. The first constricted portion cooperates with the switch assembly on the wheel seat to maintain the pulley assembly in a skating state protruding from the wheel seat, and the second constricted portion cooperates with the switch assembly on the wheel seat to maintain the pulley assembly in a walking state retracted into the wheel seat. The upper stop and the lower stop are used to limit the lifting range of the control block and ensure switching between the first constricted portion and the second constricted portion. Since the pulley assembly is retained in the protruding skating state by the engagement between the first constricted portion and the switch assembly, a cover is not required on the wheel seat to limit the central axis. Without the cover, the control block is exposed, allowing a user to directly operate the control block to retract the pulley assembly. In practical applications, the conventional method of applying pressure on the two wheels with both hands as in the prior art can be adopted, or the innovative method of applying pressure on the control block with one hand can be adopted.

[0031] The present invention includes a removable stopper on the wheel seat. The stopper movably engages with the rear end of the switch plate of the switch assembly, thereby effectively determining the telescopic working position of the switch plate when the switch plate abuts the stopper. The switch plate can also be effectively determined when the switch plate reaches its extreme forward position after the stopper is removed. Furthermore, a return member allows the switch plate to automatically return to its initial position away from the stopper. Furthermore, the upper and lower stops provided on the control block effectively control the lifting range of the control block, making the entire operation process stable, reliable, and safe. When the pulley assembly is to be disassembled, only the stopper needs to be removed to place the switch plate in the disassembly working position. This allows the control block to be integrally inserted into and out of the switch hole for disassembly of the pulley assembly. The steps are simple and quick, and the stopper can be removed without special tools; it can even be removed by hand. The stopper is located on the upper surface of the shoe sole and is exposed after the insole is removed, providing ample operating space. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a bottom perspective view of the pulley device of the present invention.

[0033] Figure 2 This is a top perspective view of the pulley device of the present invention.

[0034] Figure 3 It is a schematic diagram of the wheel seat structure of the present invention.

[0035] Figure 4 It is a schematic diagram of the structure of the limiting member of the present invention.

[0036] Figure 5 This is a schematic diagram of the switch assembly and the pulley assembly of the present invention.

[0037] Figure 6This is a schematic diagram of the control block structure of the present invention.

[0038] Figure 7 Schematic diagram of the cross section of the middle column of the control block of the present invention.

[0039] Figure 8 This is a projection relationship diagram of the upper stop portion, the first neck portion, the middle column and the switch hole in the three working positions of the present invention.

[0040] Figure 9 This is a diagram showing the use status of the switch panel locking working position of the present invention.

[0041] Figure 10 This is a diagram showing the state of use of the telescopic working position of the switch panel of the present invention.

[0042] Figure 11 This is a diagram of the switch board of the present invention in the disassembly and assembly working position.

[0043] Figure 12 This is a diagram showing the matching relationship between the pulley assembly of the present invention, which is retracted into the wheel seat, and the switch assembly.

[0044] Figure 13 This is a diagram showing the matching relationship between the pulley assembly protruding from the wheel seat and the switch assembly of the present invention.

[0045] Markings in the figure: 10, wheel seat; 11, accommodating cavity; 12, mounting cavity; 13, mounting groove; 14, limiting member; 15, cover plate; 141, limiting portion; 142, guide groove; 143, process groove; 21, center axis; 22, wheel body; 23, control block; 24, pop-up member; 230, guide groove; 231, intermediate column; 232, upper stop portion; 233, lower stop portion; 234, first necking portion; 235, second necking portion; 2311, first curved surface; 2312, second curved surface; 2313, transition surface; 31, switch plate; 32, return member; 33, shift member; 310, stop portion. DETAILED DESCRIPTION

[0046] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below with reference to the accompanying drawings for detailed description.

[0047] like Figures 1-13 As shown, this embodiment provides a pulley device, including a wheel seat 10, a switch assembly, and a pulley assembly. The switch assembly includes a switch plate 31 with a switch hole and a return member 32 for returning the switch plate 31. The pulley assembly includes a central shaft 21, a control block 23, and two wheel bodies 22, each axially fixed and circumferentially rotatable, disposed at either end of the central shaft 21. The control block 23 is sleeved on the central shaft 21 between the two wheel bodies 22, and the wheel body 22 protrudes downward relative to the bottom end of the control block 23. The wheel body 22 is secured to the end of the central shaft 21 by a retaining spring.

[0048] In this embodiment, a accommodating chamber 11 with an opening at the bottom is provided on the wheel seat 10. The accommodating chamber 11 includes two wheel chambers respectively configured corresponding to the wheel body 22 and an intermediate chamber located between the two wheel chambers and configured corresponding to the control block 23. The two wheel chambers are arranged on the left and the right, and the left and right sides of the intermediate chamber are respectively connected to the wheel chambers on the corresponding sides through vertical holes. The central shaft 21 rises and falls in the vertical hole, and the bottom of the vertical hole is open, which makes it convenient to install and remove the entire pulley assembly, and can also increase the height of the wheel body 22 protruding from the wheel seat 10 in the protruding wheel sliding state.

[0049] In addition, the wheel seat 10 of this embodiment is further provided with a mounting cavity 12 with a rear opening, which extends forward and backward and is connected to the middle cavity. The height of the mounting cavity 12 is suitable to enable the switch plate 31 to slide forward and backward in the mounting cavity 12, and to control the amplitude of the switch plate 31 to float up and down and to swing left and right within a very small range that does not affect the accuracy of the switch plate 31 and the control block 23.

[0050] Furthermore, the rear side of the wheel seat 10 of this embodiment is provided with a mounting slot 13 and a stopper 14 that removably fits within the mounting slot 13, above the rear opening of the mounting cavity 12. The mounting slot 13 is open at the rear and bottom. The stopper 14 slides up and down within the mounting slot 13 and has a stopper 141 that protrudes rearward. The sidewalls of the mounting slot 13 and the corresponding sidewalls of the stopper 14 are provided with mutually cooperating guide assemblies. Specifically, the guide assemblies include guide ridges on the sidewalls of the mounting slot 13 and guide grooves 142 on the sidewalls of the stopper 14. The guide ridges slide within the guide grooves 142. Furthermore, a process groove 143 is recessed on the upper rear sidewall of the stopper 14 to facilitate the removal and placement of the stopper 14.

[0051] In this embodiment, the mounting cavity 12 extends through the wheel seat 10 from front to back. The switch assembly further includes a stopper 33, which is threadedly fixed to the front opening of the mounting cavity 12. The return member 32 is disposed within the mounting cavity 12 behind the stopper 33, and the front end of the switch plate 31 abuts against the return member 32. During installation, the return member 32, preferably a compression spring, is first inserted through the front opening of the mounting cavity 12. The stopper 33 is then fixed to the front opening of the mounting cavity 12. The switch plate 31 is then inserted forward from the rear opening of the mounting cavity 12 until it abuts against the return member 32, completing the installation of the switch assembly.

[0052] When the cam 31 is in the unlock state, the locking member 32 is in the unlock state, and the locking member 32 is in the unlock state, so that the cam 31 is locked and the locking member 32 is unlocked. The position of the switch plate 31 allows for three different operating relationships between the switch hole on the switch plate 31 and the control block 23: a locked position, a retracted position, and a disassembled position. The forward position can be determined by adjusting the length of the return member 32 in its fully compressed state or by adjusting the relative distance between the rear end of the switch plate 31 and the rear wall of the wheel base 10.

[0053] In this embodiment, the pulley assembly is lifted and lowered in the accommodating chamber 11, and a pop-up member 24 is installed between the top wall of the accommodating chamber 11 and the control block 23. The pop-up member 24 is preferably a compression spring. The first contraction portion 234 located at the upper part of the control block 23 and the second contraction portion 235 located at the lower part of the control block 23 are arranged at intervals on the circumference of the control block 23. The control block 23 is also provided with an upper stop portion 232 above the first contraction portion 234 and a lower stop portion 233 below the second contraction portion 235. When the switch plate 31 is in the assembly and disassembly working position, the control block 23 is controlled to move in and out of the switch hole as a whole to assemble and disassemble the pulley assembly. When the switch plate 31 is in the locking working position, the switch plate 31 is engaged with the first constricted portion 234 to cause the pulley assembly to protrude from the wheel seat 10, or engaged with the second constricted portion 235 to cause the pulley assembly to retract into the wheel seat 10. When the switch plate 31 is in the extension and retraction working position, the portion of the control block 23 between the first constricted portion 234 and the second constricted portion 235 moves up and down in the switch hole, and the switch plate 31 blocks the upper stop portion 232 and the lower stop portion 233.

[0054] Specifically, the control block 23 between the first constricted portion 234 and the second constricted portion 235 is configured as an intermediate post 231. The intermediate post 231 has an upper end and a lower end. The lower stop 233 is located below the intermediate post 231, and the upper stop 232 is located above the intermediate post 231. The first constricted portion 234 is located between the intermediate post 231 and the upper stop 232, and a first engaging groove is formed at the first constricted portion 234. The second constricted portion 235 is located between the intermediate post 231 and the lower stop 233, and a second engaging groove is formed at the second constricted portion 235. The portion of the control block 23 that is sleeved on the central shaft 21 is the lower stop 233, that is, the lower stop 233 is sleeved on the central shaft 21 between the two wheel bodies 22, and the lower stop 233 has a circular hole.

[0055] Regarding the relationship between the upper stop 232, the lower stop 233 and the middle column 231: the upper end of the lower stop 233 has a lower stop position protruding relative to the lower end of the middle column 231, the cross-sectional shape of the middle column 231 at any height is projected onto the lower end of the upper stop 232 within the contour line of the lower end of the upper stop 232, and the lower end of the upper stop 232 has an upper stop position protruding relative to the upper end of the middle column 231.

[0056] Regarding the relationship between the first constricted portion 234, the second constricted portion 235, and the intermediate column 231: the orthographic projection of the first constricted portion 234 on the upper end of the intermediate column 231 falls within the upper end contour of the intermediate column 231, and the upper end of the intermediate column 231 has an upper flange that protrudes relative to the first constricted portion 234. The orthographic projection of the second constricted portion 235 on the lower end of the intermediate column 231 falls within the lower end contour of the intermediate column 231, and the lower end of the intermediate column 231 has a lower flange that protrudes relative to the second constricted portion 235. Combined with the aforementioned relationship between the upper stop 232, the lower stop 233, and the intermediate column 231, it can be confirmed that the orthographic projection of the first constricted portion 234 on the lower end of the upper stop 232 falls within the lower end contour of the upper stop 232, and the orthographic projection of the second constricted portion 235 on the upper end of the lower stop 233 falls within the upper end contour of the lower stop 233.

[0057] In this embodiment, the cross-sectional shape at any height of the upper stop portion 232 is projected onto the lower end of the upper stop portion 232 within the contour line of the lower end of the upper stop portion 232. Specifically, the upper stop portion 232 is a right cylinder. In other examples, the upper stop portion 232 may also be a trapezoidal cylinder that is smaller at the top and larger at the bottom.

[0058] In this embodiment, the orthographic projection of the lower end of the top stop 232 onto the upper end of the bottom stop 233 is within the contour of the upper end of the bottom stop 233. Specifically, the contour of the orthographic projection of the top stop 232 on the upper end of the bottom stop 233 completely coincides with the contour of the upper end of the bottom stop 233. In other examples, the contour of the orthographic projection of the top stop 232 on the upper end of the bottom stop 233 is entirely indented relative to the contour of the upper end of the bottom stop 233, or the contour of the orthographic projection of the top stop 232 on the upper end of the bottom stop 233 partially coincides with the contour of the upper end of the bottom stop 233, and the remaining contour is indented relative to the contour of the upper end of the bottom stop 233. In other words, the contour of the upper end of the bottom stop 233 can be the same as the contour of the lower end of the top stop 232, and the shape of the upper end of the bottom stop 233 only needs to achieve a bottom stop position that is protruding relative to the middle column 231. In order to control the overall beauty of the block 23, this embodiment adopts the upper end shape of the lower stop 233 to be the same as the lower end shape of the upper stop 232, and the main body of the lower stop 233 and the main body of the upper stop 232 are both straight cylinders with the same outer contour line of the cross-sectional shape, specifically elliptical cylinders.

[0059] In this embodiment, the orthographic projection of the upper end of the middle column 231 on the lower end of the middle column 231 completely coincides with the contour line of the lower end of the middle column 231. Specifically, the middle column 231 is a straight column that is smaller in front and larger in the back, and has a first curved surface 2311 located on the front side of the middle column 231, a second curved surface 2312 located on the back side of the middle column 231, and a transition surface 2313 located on the left and right sides of the middle column 231 and connecting the first curved surface 2311 and the second curved surface 2312 front and back. The width of the rear end of the first curved surface 2311 in the left and right directions is greater than the width of the front end of the second curved surface 2312 in the left and right directions. The width of the transition surface 2313 in the left and right directions increases from the rear end of the first curved surface 2311 to the front end of the second curved surface 2312 on the same side.

[0060] The orthographic projection of the second curved surface 2312 on the lower end of the upper stop portion 232 completely coincides with the contour line corresponding to the lower end of the upper stop portion 232, and the orthographic projection of the first curved surface 2311 on the lower end of the upper stop portion 232 is retracted relative to the contour line corresponding to the lower end of the upper stop portion 232, and an upper stop position is formed at the position of the transition surface 2313 and the first curved surface 2311 corresponding to the lower end of the upper stop portion 232; the orthographic projection of the second curved surface 2312 on the upper end of the lower stop portion 233 completely coincides with the contour line corresponding to the upper end of the lower stop portion 233, and the orthographic projection of the first curved surface 2311 on the upper end of the lower stop portion 233 is retracted relative to the contour line corresponding to the upper end of the lower stop portion 233, and a lower stop position is formed at the position of the transition surface 2313 and the first curved surface 2311 corresponding to the lower end of the lower stop portion 233.

[0061] In this embodiment, the first necking portion 234 is retracted relative to the first curved surface 2311 and the transition surface 2313, and the first necking portion 234 is specifically in the shape of a runway consisting of two straight lines and two semicircular bends. The second necking portion 235 is retracted relative to the first curved surface 2311 and the transition surface 2313, and the second necking portion 235 is specifically in the shape of a runway consisting of two straight lines and two semicircular bends. The left and right side walls of the first necking portion 234 and the left and right side walls of the second necking portion 235 are both straight side walls extending parallel to the front-to-back direction. An upper flange is formed at the upper end of the middle column 231 corresponding to the position of the first curved surface 2311 and the transition surface 2313, and a lower flange is formed at the lower end of the middle column 231 corresponding to the position of the first curved surface 2311 and the transition surface 2313.

[0062] In this embodiment, the transition surface 2313 is composed of a first transition surface connected to the second curved surface 2312, and second transition surfaces connected to the first curved surface 2311 and the first transition surface at the front and rear ends, respectively. The first transition surface is a circular curved surface, and the second transition surface is a flat surface flush with the straight sidewall. It should be noted that in other examples, the transition surface 2313 may also consist of only one surface, such as a circular curved surface or an inclined plane.

[0063] A guide slot 230 is defined on the side of the control block 23. The guide slot 230 extends vertically through the upper stop 232 and the intermediate post 231, communicating with the first and second retaining slots formed at the first and second constricted portions 234 and 235. The guide slot 230 serves to guide the control block 23 in its vertical movement. A blind hole is formed within the upper stop 232, the first constricted portion 234, and the intermediate post 231. One end of the ejector 24 extends into the hole to maintain the ejector 24 in an upright position and provide a spring force to the control block 23 in a vertical direction parallel to the intermediate cavity.

[0064] In addition, in order to prevent foreign objects on the ground from entering the wheel cavity or the middle cavity through the bottom opening of the accommodating cavity 11 when the pulley assembly is in the retracted walking state, this embodiment further provides a cover plate 15 at the bottom of the wheel seat 10 for opening or closing the bottom opening of the accommodating cavity 11. The cover plate 15 is a sliding cover or a flip cover, and the matching structure between the sliding cover or the flip cover and the wheel seat 10 is a conventional technical structure, which will not be repeated here.

[0065] The pulley extension and retraction operation method of the pulley assembly of this embodiment is as follows: in the initial state, the switch assembly is engaged with the second retracted portion 235 on the control block 23, at which time the switch assembly is in the locked working position and the pulley assembly is retracted into the wheel seat 10; press the switch assembly so that the switch assembly moves from the locked working position to the retracted working position, and the control block 23 moves downward. When the control block 23 moves to the first retracted portion 234 corresponding to the position of the switch assembly, it is blocked by the upper stop 232 and the switch assembly returns to the locked working position. At this time, the switch assembly is engaged with the first retracted portion 234, and the pulley assembly protrudes from the wheel seat 10; press the switch assembly again to move it to the retracted working position and maintain it in the retracted working position, and then press the control block 23 with one hand or press the two wheel bodies 22 with both hands to move the control block 23 upward. When the control block 23 moves to the second retracted portion 235 corresponding to the position of the switch assembly, it is blocked by the lower stop 233 and the switch assembly returns to the locked working position. At this time, the switch assembly is engaged with the second retracted portion 235 and returns to the initial state.

[0066] This embodiment also provides a sole, including a sole body and the above-mentioned pulley device, the pulley device is installed on the heel of the sole body, the rear side of the sole body is provided with a mounting hole and a pressing block movably inserted into the mounting hole, the pressing block cooperates with the switch plate 31, and the telescopic operation of the switch plate 31 is realized by the pressing block.

[0067] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pulley device, characterized in that: include: A wheel seat, wherein the wheel seat is provided with a receiving cavity with a bottom opening and a mounting cavity with a rear opening, the mounting cavity is arranged to extend frontward and rearward and is in communication with the receiving cavity, and a mounting groove and a stopper detachably engaged in the mounting groove are provided above the rear opening of the mounting cavity on the rear side of the wheel seat; The switch assembly includes a switch plate with a switch hole and a return member for returning the switch plate, wherein the switch plate is slidably fitted in the mounting cavity and a rear end of the switch plate extends out of the mounting cavity, and the rear end of the switch plate has a stop portion that protrudes upward and movably abuts against the limit member; The pulley assembly includes a central shaft, a control block, and two wheel bodies respectively fixed axially and rotatably arranged at both ends of the central shaft, the control block being sleeved on the central shaft between the two wheel bodies, the wheel body protruding downward relative to the bottom end of the control block, the pulley assembly being lifted and lowered in the accommodating cavity, and a pop-up member being installed between the top wall of the accommodating cavity and the control block, a first constricted portion located at the upper part of the control block and a second constricted portion located at the lower part of the control block being arranged at intervals on the circumference of the control block, and the control block is further provided with an upper stop portion above the first constricted portion and a lower stop portion below the second constricted portion; The switch plate has a locking working position in which the rear end of the switch plate is away from the limit member, a telescopic working position in which the rear end of the switch plate abuts the limit member, and a disassembly working position in which the switch plate slides forward to the front end after the limit member is removed. When the switch plate is in the disassembly working position, the control block as a whole enters and exits the switch hole to disassemble and assemble the pulley assembly. When the switch plate is in the locking working position, the switch plate is clamped at the first contraction portion to cause the pulley assembly to protrude from the wheel seat, or is clamped at the second contraction portion to cause the pulley assembly to retract into the wheel seat. When the switch plate is in the telescopic working position, the portion of the control block located between the first contraction portion and the second contraction portion rises and falls in the switch hole, and the switch plate blocks the upper stop portion and the lower stop portion.

2. The pulley device according to claim 1, characterized in that: The mounting cavity passes through the wheel seat front and back, and the switch assembly further includes a shifting member fixedly arranged at the front opening of the mounting cavity, and the return member is arranged in the mounting cavity behind the shifting member, and the front end of the switch plate abuts against the return member.

3. The pulley device according to claim 1, characterized in that: The installation cavity includes two wheel cavities respectively configured corresponding to the wheel body and an intermediate cavity located between the two wheel cavities and configured corresponding to the control block. The left and right sides of the intermediate cavity are respectively connected to the wheel cavity on the corresponding side through vertical holes. The central axis rises and falls in the vertical holes, and the bottom of the vertical holes is open.

4. The pulley device according to claim 3, characterized in that: A guide groove is provided on the side surface of the control block, and a guide bar is protruded at a position of the intermediate cavity corresponding to the guide groove, and the guide bar is slidably matched with the guide groove.

5. The pulley device according to claim 1, characterized in that: The control block between the first constricted portion and the second constricted portion is configured as an intermediate column, wherein the intermediate column has an upper end and a lower end; The lower stop is located below the middle column and is sleeved on the central axis between the two wheel bodies. The upper end of the lower stop has a lower stop position that protrudes relative to the lower end of the middle column. The upper stop is located above the middle column, the orthographic projection of the cross-sectional shape of the upper stop at any height on the lower end of the upper stop is within the contour line of the lower end of the upper stop, the orthographic projection of the lower end of the upper stop on the upper end of the lower stop is within the contour line of the upper end of the lower stop, the orthographic projection of the cross-sectional shape of the middle column at any height on the lower end of the upper stop falls within the contour line of the lower end of the upper stop, and the lower end of the upper stop has an upper stop position that protrudes relative to the upper end of the middle column; The first constricted portion is located between the middle column and the upper stop portion, the orthographic projection of the first constricted portion on the upper end of the middle column falls within the contour line of the upper end of the middle column, the upper end of the middle column has an upper flange protruding relative to the first constricted portion, and the orthographic projection of the first constricted portion on the lower end of the upper stop portion falls within the contour line of the lower end of the upper stop portion; The second constricted portion is located between the middle column and the lower stop, the orthographic projection of the second constricted portion on the lower end of the middle column falls within the contour line of the lower end of the middle column, the lower end of the middle column has a lower flange protruding relative to the second constricted portion, and the orthographic projection of the second constricted portion on the upper end of the lower stop falls within the contour line of the upper end of the lower stop; The left and right side walls of the first constricted portion and the left and right side walls of the second constricted portion are both straight side walls extending in parallel along the front-to-back direction.

6. The pulley device according to claim 5, characterized in that: The middle column is a straight column that is smaller in the front and larger in the back, and has a first curved surface located on the front side of the middle column, a second curved surface located on the back side of the middle column, and transition surfaces located on the left and right sides of the middle column and connecting the first curved surface and the second curved surface front and back. The width of the rear end of the first curved surface in the left and right directions is greater than the width of the front end of the second curved surface in the left and right directions, and the width of the transition surface in the left and right directions increases from the rear end of the first curved surface to the front end of the second curved surface on the same side.

7. The pulley device according to claim 6, characterized in that: The orthographic projection of the first curved surface on the lower end of the upper stop portion is retracted relative to the contour line corresponding to the lower end of the upper stop portion, and the upper stop position is formed at the position of the transition surface and the first curved surface corresponding to the lower end of the upper stop portion; the orthographic projection of the first curved surface on the upper end of the lower stop portion is retracted relative to the contour line corresponding to the upper end of the lower stop portion, and the lower stop position is formed at the position of the transition surface and the first curved surface corresponding to the lower end of the lower stop portion.

8. The pulley device according to claim 6, characterized in that: The first necking portion is retracted relative to the first curved surface and the transition surface, the second necking portion is retracted relative to the first curved surface and the transition surface, an upper flange is formed at the upper end of the intermediate column corresponding to the position of the first curved surface and the transition surface, and a lower flange is formed at the lower end of the intermediate column corresponding to the position of the first curved surface and the transition surface.

9. Sole, characterized by: It comprises a sole body and a pulley device as described in any one of claims 1 to 8, wherein the pulley device is installed on the heel of the sole body, the rear side of the sole body is provided with a mounting hole and a pressing block movably inserted into the mounting hole, and the pressing block cooperates with the switch plate.

10. A pulley extension and retraction operation method of a pulley device according to any one of claims 1 to 8, characterized in that: The pulley assembly is lifted and retracted by the control block thereon, and the control block is provided with a first and a second retracted portion at intervals on the upper and lower surfaces thereof, and an upper stop portion is provided above the first retracted portion and a lower stop portion is provided below the second retracted portion. The switch assembly has a locking working position and a retracting working position. The pulley retracting and retracting operation method is as follows: In the initial state, the switch assembly is engaged with the second retracted portion on the control block. At this time, the switch assembly is in the locked working position, and the pulley assembly is retracted into the wheel seat; Applying pressure to the switch assembly causes the switch assembly to move from the locked working position to the retracted working position, and the control block moves downward. When the control block moves to the first retracted portion corresponding to the position of the switch assembly, it is stopped by the upper stop portion, and the switch assembly returns to the locked working position. At this time, the switch assembly is snap-fitted into the first retracted portion, and the pulley assembly protrudes from the wheel seat. Then, pressure is applied to the switch assembly to move it to the telescopic working position and maintain it in the telescopic working position. Then, pressure is applied to the control block with one hand or to the two wheels with both hands to move the control block upward. When the control block moves to the second retracted portion corresponding to the position of the switch assembly, it is blocked by the lower stop portion and the switch assembly returns to the locked working position. At this time, the switch assembly is snap-fitted into the second retracted portion and returns to the initial state.

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