Electrically tightening / loosening strap structure

Abstract

Disclosed in the present invention is an electrically tightening / loosening strap structure, comprising a housing and a strap. A strap tail portion of the strap is fixedly connected to the housing, and a strap head portion of the strap penetrates through the housing. The housing is internally provided with a motor assembly; an output end of the motor assembly is transmissively connected to a gear by means of a clutch assembly; and the strap is provided with a rack meshed with the gear. Starting the motor assembly to drive the rack can tighten / loosen the strap; or manually pulling the strap head portion of the strap can also tighten the strap. When the strap is manually pulled, damage to the motor assembly is reduced under the action of the clutch assembly.

Description

Electrically-driven elastic band structure TECHNICAL FIELD

[0001] The present application relates to the field of bandage equipment, in particular to an electrically-driven elastic band structure. BACKGROUND

[0002] The band structure is a kind of fixed, tightened article, usually used as waistband, braces, safety belt and other daily necessities. With the development of science and technology, there are electrically-driven elastic band structures in the prior art, for example, a kind of electrically-driven elastic band structure disclosed in Chinese patent CN207075619U, which comprises a shell, the shell is formed with two opposite through holes, the belt is arranged in the shell through the through holes, and a rack is arranged on the belt. A drive motor is arranged in the shell, a worm is arranged on the output shaft of the drive motor, the worm is engaged with the rack, and the drive motor can drive the worm to rotate to drive the rack to move linearly. The above-mentioned electrically-driven elastic band structure has the following problems: since the worm and the rack are self-locking, the belt can only be retracted and extended by the drive of the drive motor, and cannot be tightened by manually pulling the belt. In view of this, the present application provides an electrically-driven elastic band structure to solve the above-mentioned problems. SUMMARY

[0003] The present application overcomes the above-mentioned technical deficiencies and provides an electrically-driven elastic band structure.

[0004] To achieve the above-mentioned purposes, the present application adopts the following technical solutions:

[0005] An electrically-driven elastic band structure comprises a shell and a band, the tail of the band is fixedly connected with the shell, the head of the band penetrates the shell, a motor assembly is arranged in the shell, the output end of the motor assembly is connected with a gear through a clutch assembly, and the band is provided with a rack for engaging with the gear; when the motor assembly is started to drive the rack to realize the tightening of the band, or when the head of the band is manually pulled to realize the tightening of the band, the damage to the motor assembly is reduced under the action of the clutch assembly when the band is manually pulled.

[0006] Preferably, the clutch assembly comprises a fixed ring, a moving ring located in the fixed ring, and a clutch output shaft; the clutch output shaft penetrates the shaft center of the gear and is in transmission connection with the gear; the moving ring comprises a connecting shaft part for transmission connection with the output end of the motor assembly, at least two transmission parts are arranged around the shaft center of the connecting shaft part, the interval between adjacent transmission parts is an active recess, and a locking piece is arranged in the active recess; one end of the clutch output shaft is a transmission end, the transmission end is arranged in the rotating shaft slot formed by the transmission parts, the locking piece is arranged between the transmission recess and the rotating shaft slot, and the outer periphery of the transmission end is provided with a transmission recess for contact with the locking piece; when the binding belt is manually pulled, the gear rotates to drive the transmission end to rotate to the transmission recess in contact with the locking piece, the transmission recess pushes the locking piece to the transmission part through static friction, so that the moving ring rotates.

[0007] Preferably, the distance between the center of the transmission recess and the inner surface of the fixed ring is greater than the width of the locking piece, the distance between the transmission recess and the inner surface of the fixed ring gradually decreases from the center to the left and right sides, the distance between the left and right sides of the transmission recess and the inner surface of the fixed ring is less than the width of the locking piece, and the transmission end and the locking piece are in a separated state when the locking piece is opposite to the center of the transmission recess; when the locking piece is in contact with the part close to the two sides of the transmission recess, the transmission end and the locking piece are in an engaged state.

[0008] Preferably, the transmission end is a columnar structure formed by vertically cutting the cylindrical section, the outer periphery of the transmission end comprises vertical sections and circular arc surfaces between adjacent vertical sections, the transmission part is an arc surface with a size matched with the circular arc surface, and the transmission part is not in transmission connection with the circular arc surface; the locking piece is a cylindrical structure.

[0009] Preferably, the motor assembly comprises a motor and a reduction gear box, and the output end of the motor is in transmission connection with the connecting shaft part through the reduction gear box.

[0010] Preferably, the shell comprises an outer shell and a panel located at the front end face of the outer shell, the front end face of the outer shell is provided with a gear through hole for the gear to penetrate, one side edge of the panel is hinged to the outer shell through an elastic hinge assembly, the back surface of the panel is provided with a pressing part, and the panel and the front end face of the outer shell are spaced apart to form a channel for the binding belt to pass through through the pressing part; when the panel can be flipped relative to the outer shell, the elastic hinge assembly generates a restoring force, and when the panel is not flipped, the binding belt is tightly pressed against the front end face of the outer shell through the restoring force of the elastic hinge assembly.

[0011] Preferably, the elastic hinge assembly comprises two hinge parts arranged on the back surface of the panel, a hinge shaft located in the inner part of the outer shell, and a torsional spring sleeved on the hinge shaft, the hinge parts are penetrated into the inner part of the outer shell, the two ends of the hinge shaft are connected with the two hinge parts respectively, and the panel flipping drives the hinge shaft to rotate.

[0012] Preferably, a slot is provided on the surface of the hinge shaft, and arms are provided at both ends of the torsion spring. One arm of the torsion spring is engaged with the slot, and the other arm is pressed against the inner wall of the shell.

[0013] Preferably, the electric elastic band structure further includes a rotating connector, the tail of the band is fixedly connected to the rotating connector, the rotating connector is provided with a rotating part, the rotating part passes through the interior of the shell and is hinged to the hinge shaft, so that the rotating part can rotate relative to the shell.

[0014] Preferably, a circuit board and a battery for providing electrical energy to the circuit board and the motor are provided in the shell. The circuit board is provided with a pressure switch for controlling the operation of the motor. A charging socket and a button are provided on the side of the shell. The charging socket is used to charge the battery, and the button is used to trigger the pressure switch.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention's straps can be tightened and loosened not only by the motor assembly driving the gears, but also by manual tightening. External forces acting on the motor assembly's output terminal could damage the motor assembly's mechanical structure. Furthermore, during manual tightening, the rack drives the gears, which are frictionally connected to the motor assembly's output terminal via the clutch assembly. This reduces the power transmitted to the motor assembly's output terminal, thereby minimizing damage to the motor assembly from external forces during manual tightening.

[0017] 2. When manually pulling the strap, the gear first drives the transmission end to rotate to the transmission recess and engage the locking member, reducing the power transmitted by the gear to the output end of the motor assembly. The transmission recess then pushes the locking member toward the transmission part, further reducing the power transmitted by the gear to the output end of the motor assembly, thereby reducing damage to the motor assembly from external forces. Furthermore, the transmission end is a columnar structure formed by cutting a vertical cross-section of a cylinder, which provides a simple structure.

[0018] 3. One side of the panel is hinged to the shell through an elastic hinge assembly. When the panel is not flipped over, the panel presses the strap tightly against the front face of the shell through the elastic hinge assembly to prevent the strap from detaching from the shell. Under the action of the elastic hinge assembly, the panel can automatically reset after being flipped over. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is an overall schematic diagram of an electric elastic band structure of the present invention;

[0020] FIG2 is a cross-sectional view taken along line AA of FIG1 ;

[0021] FIG3 is a rear view of an electric elastic band structure of the present invention;

[0022] Fig. 4 is a schematic view of the inside of the rear shell of the present application;

[0023] Fig. 5 is an exploded schematic view of the shell of the present application;

[0024] Fig. 6 is an exploded schematic view of the clutch assembly of the present application;

[0025] Fig. 7 is a schematic view of the connection of the clutch assembly and the motor assembly of the present application;

[0026] Fig. 8 is a schematic view of the clutch assembly of the present application;

[0027] Fig. 9 is a sectional view at B-B of Fig. 8, with the clutch assembly in a disengaged state;

[0028] Fig. 10 is a sectional view at B-B of Fig. 8, with the clutch assembly in an engaged state;

[0029] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0030] The features of the present application and other related features will be further described in detail by way of examples as follows, so as to facilitate the understanding of the skilled in the art:

[0031] Referring to Figs. 1-10, an embodiment of an electrically driven elastic band structure of the present application is presented:

[0032] An electrically driven elastic band structure comprises a shell, an elastic band 1, one end of the elastic band 1 being fixedly connected to the shell, and the other end of the elastic band 1 penetrating through the shell. A motor assembly 2 is arranged in the shell, and the output end of the motor assembly 2 is in transmission connection with a gear 31 through a clutch assembly 3. The elastic band 1 is provided with a rack 11 for engaging with the gear 31; when the motor assembly 2 is started to drive the rack 11, the elastic band 1 can be loosened or tightened; or when the movable end of the elastic band 1 is manually pulled, the elastic band 1 can also be loosened or tightened.

[0033] As shown in Figures 5-8, the clutch assembly 3 includes a fixed ring 32, a movable ring 33 positioned within the fixed ring 32, and a clutch output shaft 34. The clutch output shaft 34 passes through the axis of the gear 31. The clutch output shaft 34 has a non-cylindrical structure, enabling transmission connection between the clutch output shaft 34 and the gear 31. The moving ring 33 includes a coupling portion 331 for transmission connection with the output end of the motor assembly 2. The coupling portion 331 is provided with at least two transmission portions 332 around its axis, with movable recesses 333 separating adjacent transmission portions 332. A locking member 35 is positioned within the movable recesses 333. One end of the clutch output shaft 34 is a transmission end 36, which is positioned within a rotating shaft groove 334 formed around the transmission portion 332. The transmission end 36 is provided with transmission recesses 361 on its outer periphery, corresponding in number to the movable recesses 333. The locking member 35 is positioned between the transmission recesses 361 and the movable recesses 333. The distance between the center of the transmission recess 361 and the inner surface of the fixing ring 32 is greater than the width of the locking member 35. The distance between the transmission recess 361 and the inner surface of the fixing ring 32 gradually decreases from the center of the transmission recess 361 to the left and right sides. The distances between the left and right sides of the transmission recess 361 and the inner surface of the fixing ring 32 are both less than the width of the locking member 35. As shown in FIG9 , when the locking member 35 and the center of the transmission recess 361 are aligned, the transmission end 36 and the locking member 35 are in a disengaged state. As shown in FIG10 , when the portion of the transmission recess 361 near the arcuate surface 362 contacts the locking member 35, the transmission end 36 and the locking member 35 are in an engaged state.

[0034] The present invention drives the rack 11 through the motor assembly 2 to achieve the tightening and loosening of the strap 1 as follows: the motor assembly 2 drives the moving ring 33 to rotate, the transmission part 332 pushes the locking member 35, so that the locking member 35 contacts the transmission recess 361, the locking member 35 drives the transmission end 36 to rotate together, the clutch output shaft 34 drives the gear 31 to rotate, and the gear 31 drives the rack 11 to move linearly, finally achieving the tightening and loosening of the strap 1.

[0035] The process of tightening or loosening the strap 1 by manually pulling the strap 1 is as follows: When the strap 1 is manually pulled, the rack 11 drives the gear 31 and the clutch output shaft 34 to rotate together. The transmission end 36 first rotates to the transmission recess 361 and contacts the locking member 35, causing the power transmitted by the gear 31 to the output end of the motor assembly 2 to be reduced. At this time, the output end of the motor assembly 2 is still not affected by the gear 31, and acts as a buffer. Then, the transmission recess 361 pushes the locking member 35 toward the transmission part 332, further reducing the power transmitted by the gear 31 to the output end of the motor assembly 2. At this time, the output end of the motor assembly 2 is still not affected by the gear 31. Finally, the transmission recess 361 drives the transmission part 332 to rotate through the locking member 35. At this time, the motion ring 33 drives the output end of the motor assembly 2.

[0036] Frequent rotation of the motor's rotor by external force will damage the motor. The present invention connects the gear 31 and the output end of the motor assembly 2 through the clutch assembly 3, so that the power transmitted to the output end of the motor assembly 2 by the gear 31 is reduced, thereby reducing the damage to the motor assembly 2 caused by external force during the manual pulling of the strap 1.

[0037] Specifically, the transmission end 36 is a simple cylindrical structure formed by cutting a vertical cross-section of a cylinder. The outer periphery of the transmission end 36 includes vertical sections and arcuate surfaces 362 located between adjacent vertical sections. The transmission portion 332 is an arcuate surface whose size matches the arcuate surface 362. The transmission portion 332 is not in driving connection with the arcuate surface 362. The gap between the transmission portion 332 and the arcuate surface 362 is smaller than the width of the locking member 35, preventing the locking member 35 from moving between the moving portion and the arcuate surface 362.

[0038] Specifically, the locking member 35 is a cylindrical structure, which reduces friction between the locking member 35 and the transmission recess 361 .

[0039] The housing includes an outer shell and a panel 5 located at the front end of the outer shell. The front end of the outer shell is provided with a gear through-hole 61 for the gear 31 to pass through. One side of the panel 5 is hinged to the outer shell via an elastic hinge assembly. The back of the panel 5 is provided with a pressing portion 51. The panel 5 is separated from the front end of the outer shell by the pressing portion 51 to form a passage for the bandage 1 to pass through. When the panel 5 can be flipped relative to the outer shell, the panel 5 is in an open state, which can be used to remove the head of the bandage 1. The elastic hinge assembly generates a restoring force. When the panel 5 is released, the panel 5 automatically resets due to the restoring force of the elastic hinge assembly, and the panel 5 is in a closed state. The panel 5 presses the bandage 1 against the front end of the outer shell to prevent the bandage 1 from detaching from the outer shell.

[0040] As shown in Figures 5-6, the elastic hinge assembly includes two hinged portions 52 disposed on the back of the panel 5, a hinge shaft 71 located within the housing, and a torsion spring 72 sleeved on the hinge shaft 71. The hinged portions 52 extend into the housing, and the ends of the hinge shaft 71 are connected to the two hinged portions 52, respectively. A slot 711 is provided on the surface of the hinge shaft 71, and each end of the torsion spring 72 has an arm. One arm of the torsion spring 72 engages with the slot 711, while the other arm presses against the inner wall of the housing. The elastic hinge assembly is disposed within the housing, has a simple structure, and is compact, occupying a small amount of space within the housing, thereby reducing the size of the housing.

[0041] Specifically, screw holes are provided at both ends of the hinge shaft 71. Rivets 73 extend from the exterior of the housing into the interior of the housing and connect to the screw holes, securing the hinge shaft 71 within the housing and enabling it to rotate along its own axis. To further enhance the stability of the hinge shaft 71, a positioning member 74 is provided within the housing. The positioning member 74 is fixedly connected to the housing and has a positioning hole 741 formed therein for the hinge shaft 71 to pass through. The diameter of the positioning hole 741 matches the size of the hinge shaft 71.

[0042] The electric elastic band structure also includes a rotating connector 8, to which the tail of the band 1 is fixedly connected. The rotating connector 8 includes a rotating portion 81, which extends into the interior of the housing and is hingedly connected to a hinge shaft 71, allowing the rotating portion 81 to rotate relative to the housing. The hinge shaft 71 is used to rotate both the panel 5 and the rotating portion 81 and the tail of the band 1, providing a high degree of practicality and simplifying the electric elastic band structure.

[0043] The housing is formed by a front cover 6 and a rear cover 9 connected relative to each other. A gear hole 61 is provided in the front cover 6. The motor assembly 2 includes a motor 21 and a reduction gearbox 22. The output end of the motor 21 is drivingly connected to the coupling 331 through the reduction gearbox 22. The rear cover 9 is provided with a motor slot sized appropriately for the motor assembly 2. The reduction gearbox 22 is fixedly connected to the rear cover 9, and the retaining ring 32 is engaged with the reduction gearbox 22, securing the retaining ring 32 within the housing.

[0044] The housing houses a circuit board 23 and a battery 24 for powering the circuit board 23 and motor 21. The circuit board 23 is equipped with a pressure switch for controlling the operation of the motor 21. A charging socket 25 and a button 26 are located on the side of the housing. The charging socket 25 is used to charge the battery 24, and the button 26 is used to activate the pressure switch. When the battery 24 is low on power, the strap 1 can be manually adjusted to loosen or tighten.

[0045] Specifically, a groove is provided on the back of the strap, and the groove is provided with a plurality of straight teeth that are equally spaced and parallel to each other. All the straight teeth in the groove constitute a rack 11, and the gear 31 is engaged with the rack 11 in the groove. Under the pressure of the panel 5, the gear 31 is difficult to disengage from the groove. When the panel 5 is in a closed state, the gear 31 is firmly engaged with the rack 11.

[0046] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An electric elastic band structure, characterized in that: The invention comprises a shell and a strap (1), wherein the tail of the strap (1) is fixedly connected to the shell, the head of the strap (1) passes through the shell, a motor assembly (2) is provided in the shell, the output end of the motor assembly (2) is connected to a gear (31) through a clutch assembly (3), and the strap (1) is provided with a rack (11) for engaging with the gear (31); when the motor assembly (2) is started, the rack (11) is driven to tighten the strap (1); or when the head of the strap (1) is manually pulled, the strap (1) can also be tightened. When the strap (1) is manually pulled, the strap (1) can be tightened. When the clutch assembly (3) is engaged, damage to the motor assembly is reduced.

2. The electric elastic band structure according to claim 1, characterized in that: The clutch assembly (3) comprises a fixed ring (32), a moving ring (33) located inside the fixed ring (32), and a clutch output shaft (34); the clutch output shaft (34) passes through the axis of the gear (31) and is in transmission connection with the gear (31); the moving ring (33) comprises a coupling portion (331) for transmission connection with the output end of the motor assembly (2); the coupling portion (331) is provided with at least two transmission portions (332) around the axis of the coupling portion (331); the interval between adjacent transmission portions (332) is a movable recess (333), and a locking member (35) is provided in the movable recess (333); the clutch One end of the output shaft (34) is a transmission end (36), and the transmission end (36) is placed in a rotating shaft groove formed around the transmission part (332). The locking member (35) is inserted between the transmission recess (361) and the rotating shaft groove. The outer periphery of the transmission end (36) is provided with a transmission recess (361) for the locking member (35) to contact. When the strap (1) is manually pulled, the gear (31) rotates to drive the transmission end (36) to rotate to the transmission recess (361) and contact with the locking member (35). The transmission recess (361) pushes the locking member (35) toward the transmission part (332) through static friction, so that the moving ring (33) rotates.

3. The electric elastic band structure according to claim 1, characterized in that: The distance between the center of the transmission recess (361) and the inner surface of the fixed ring (32) is greater than the width of the locking member (35), and the distance between the transmission recess (361) and the inner surface of the fixed ring (32) gradually decreases from the center to the left and right sides of the transmission recess (361), and the distance between the left and right sides of the transmission recess (361) and the inner surface of the fixed ring (32) is less than the width of the locking member (35). When the locking member (35) is opposite to the center of the transmission recess (361), the transmission end (36) and the locking member (35) are in a separated state; when the locking member (35) contacts the parts close to the two sides of the transmission recess (361), the transmission end (36) and the locking member (35) are in an engaged state.

4. An electric elastic band structure according to claim 2 or 3, characterized in that: The transmission end (36) is a columnar structure formed by cutting a cross section of a cylinder in the vertical direction. The outer periphery of the transmission end (36) includes a vertical section and an arc surface (362) located between adjacent vertical sections. The transmission part (332) is an arc surface whose size is adapted to the arc surface (362), and the transmission part (332) is not connected to the arc surface (362) in a transmission manner. The locking member (35) is a cylindrical structure.

5. The electric elastic band structure according to claim 2, characterized in that: The motor assembly (2) comprises a motor (21) and a reduction gear box (22), and the output end of the motor (21) is transmission-connected to the coupling portion (331) via the reduction gear box (22).

6. The electric elastic band structure according to claim 1, characterized in that: The shell comprises an outer shell and a panel (5) located at the front end face of the outer shell, wherein the front end face of the outer shell is provided with a gear through hole (61) for the gear (31) to pass through; one side of the panel (5) is hinged to the outer shell through an elastic hinge assembly, and the back of the panel (5) is provided with a pressing portion (51), and the panel (5) is spaced from the front end face of the outer shell by the pressing portion (51) to form a channel for the strap (1) to pass through; when the panel (5) can be flipped relative to the outer shell, the elastic hinge assembly generates a restoring force, and when the panel (5) is not flipped, the panel (5) presses the strap (1) tightly against the front end face of the outer shell through the restoring force of the elastic hinge assembly.

7. The electric elastic band structure according to claim 6, characterized in that: The elastic hinge assembly comprises two hinge parts (52) arranged on the back of the panel (5), a hinge shaft (71) located inside the shell, and a torsion spring (72) sleeved on the hinge shaft (71); the hinge parts (52) pass through the inside of the shell, and the two ends of the hinge shaft (71) are respectively connected to the two hinge parts (52); when the panel (5) is turned over, the hinge shaft (71) will drive the rotation of the hinge shaft.

8. The electric elastic band structure according to claim 7, characterized in that: A slot (711) is provided on the surface of the hinge shaft (71), and arms are provided at both ends of the torsion spring (72). One arm of the torsion spring (72) is engaged with the slot (711), and the other arm is pressed against the inner wall of the shell.

9. The electric elastic band structure according to claim 6, characterized in that: The invention also includes a rotating connecting member (8), wherein the tail of the strap (1) is fixedly connected to the rotating connecting member (8), and the rotating connecting member (8) is provided with a rotating portion (81). The rotating portion (81) passes through the interior of the shell and is hinged to the hinge shaft (71), so that the rotating connecting member (8) can rotate relative to the shell.

10. The electric elastic band structure according to claim 6, characterized in that: A circuit board (23) and a battery (24) for providing electrical energy to the circuit board (23) and the motor assembly (2) are provided in the housing; a pressure switch for controlling the operation of the motor assembly (2) is provided on the circuit board (23); a charging socket (25) and a button (26) are provided on the side of the housing; the charging socket (25) is used to charge the battery (24); and the button (26) is used to trigger the pressure switch.

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