Patent Application
20240181290
The invention relates to the technical field of fitness equipment, in particular to a spring exerciser.
Chinese patent CN206239957U discloses a spring exerciser, which is integrally formed by a left tension device and a right tension device rotatably connected to each other through a connecting shaft. The left and the right tension devices are designed separately, in other words, each tension device is independently provided with a pull rope, a rope wheel, and a coil spring etc.; hence, this prior art has the following defects: 1) There are many parts and the structure is complex which lead to inconvenience and high cost in production; 2) When exercising using the left and the right tension devices, it is difficult to ensure synchronized pulling movements of the left hand and the right hand, and it is also difficult to ensure a balance of strength of the two arms during exercise, thereby affecting the outcome of such body exercise; 3) The two functions provided by the prior art, namely hands-operated pull resistance training and hands-and-legs-operated pull resistance training by attaching a pedal to the exerciser, are insufficient and need to be further improved.
To solve the aforementioned problems, this invention provides a spring exerciser which is easy to produce with a simple and reasonable structure, low cost, and allows synchronized movements and balance of strength of the arms during exercise, and provides various functions.
This invention adopts the following technical solution:
A spring exerciser, comprising a case, a pull strap, and a rewinding mechanism; the rewinding mechanism comprises a supporting shaft fixed inside the case, and also comprises a rewinding hub arranged inside the case and rotatably sleeving the supporting shaft; the rewinding hub comprises an inner cavity and a winding groove annularly provided outside an outer wall of the inner cavity; a torsion spring is installed in the inner cavity; one end of the torsion spring is fixed to the supporting shaft, and another end of the torsion spring is fixed to the rewinding hub; the pull strap comprises a middle portion, as well as a first end portion and a second end portion respectively provided at two ends of the middle portion; the middle portion is positioned in the inner cavity; the first end portion passes through a first opening at one side of the outer wall of the inner cavity and is wound in the winding groove; the second end portion passes through a second opening at another side of the outer wall of the inner cavity and is also wound in the winding groove; the first end portion and the second end portion are both wound in the winding groove to form layers of winding coils defined alternately by the first end portion and the second end portion; an end of the first end portion distal from the middle portion passes through one side of the case and is connected with a first handle; an end of the second end portion distal from the middle portion passes through another side of the case and is connected with a second handle or a fixing component.
Further, the first end portion passes through the first opening and winds around an upper peripheral wall of the rewinding hub, and then winds around an outer side of the second end portion passing through the second opening; the second end portion passes through the second opening and winds around a lower peripheral wall of the rewinding hub, and then winds around an outer side of the first end portion passing through the first opening; therefore, the first end portion and the second end portion are wound in the wind groove to form layers of winding coils defined alternately by the first end portion and the second end portion.
Further, the inner cavity comprises a first cavity surrounding the supporting shaft and defined within an inner wall of the inner cavity, and a second cavity outside the first cavity; the second cavity is defined between the inner wall of the inner cavity and the outer wall of the inner cavity, and is separated from the first cavity by the inner wall of the inner cavity; the torsion spring is installed in the first cavity; the middle portion is positioned in the second cavity; one side of a side wall of the second cavity comprises the first opening allowing the first end portion to pass through, and another side of the side wall of the second cavity comprises the second opening allowing the second end portion to pass through.
Further, the rewinding hub comprises a hub body and a side cover; the first cavity and the second cavity are provided on the hub body and having openings facing towards the side cover; the side cover covers the openings of the first cavity and the second cavity; the hub body comprises an annular stopping edge which is provided on an outer periphery of a side of the hub body distal from the side cover; the winding groove is defined between the annular stopping edge and an outer peripheral edge of the side cover.
Further, a set of limiting-and-butting blocks is provided on an inner surface of the side cover corresponding to the second cavity; the set of limiting-and-butting blocks is inserted into the second cavity and presses against the middle portion of the pull strap, such that the middle portion of the pull strap is limited in the second cavity and not capable of being displaced circumferentially in the second cavity.
Further, a bottom wall of the first cavity is provided with a first through hole allowing the supporting shaft to pass through; the side cover is provided with a second through hole allowing the supporting shaft to pass through; one bearing is provided on the supporting shaft adjacent the first through hole, and another bearing is provided on the supporting shaft adjacent the second through hole; two ends of the supporting shaft pass through the first through hole and the second through hole respectively, and the two ends of the supporting shaft are each connected with a hex nut; the case is jointly formed by a first half shell and a second half shell joined together; inner walls of the first half shell and the second half shell are provided with a first inner hexagonal limiting hole and a second inner hexagonal limiting hole respectively; each of the inner hexagonal limiting hole and the inner hexagonal limiting hole allows insertion and fixation of a corresponding hex nut.
Further, said one side of the case is provided with a first hole allowing the end of the first end portion distal from the middle portion to pass through, and said another side of the case is provided with a second hole allowing the end of the second end portion distal from the middle portion to pass through; the first hole, the second hole, the first opening, and the second opening are all located on a central plane that aligns with a central axis of the supporting shaft.
Further, the first handle is detachably connected to the end of the first end portion passing through the case, and the second handle or the fixing component is detachably connected to the end of the second end portion passing through case.
Further, the end of the first end portion passing through the case is provided with a first thread connecting portion, and the end of the second end portion passing through the case is provided with a second thread connecting portion; the first handle and the second handle are of the same structure, each includes an annular grip band, a grip sleeve wrapping around one end of the annular grip band, and a first thread connecting head; the first thread connecting head is provided at another end of the annular grip band and is detachably connected to the first thread connecting portion or the second thread connecting portion; the fixing component comprises a fixing band, a resting component arranged at one end of the fixing band, and a second thread connecting head arranged at another end of the fixing band to detachably connect to the second thread connecting portion; an outer surface of the resting component is covered with a soft protective layer.
Further, the end of the first end portion and the end of the second end portion, both distal from the middle portion, pass through a left side and a right side of the case respectively; an upper side of the case is provided with a third thread connecting portion; the spring exerciser further comprises a third handle, and the third handle comprises a first grip and a second grip separated from each other, and also comprises a third thread connecting head detachably connected with the third thread connecting portion.
The benefits of this invention are:
This invention adopts the structure using a single pull strap and a single torsion spring. When compared with the prior art, the structure is simpler and more compact, the production process is easier with a lower cost. During exercise, two ends of the same pull rope are being pulled, and the resistance to be overcome when pulling comes from the same torsion spring. Therefore, pulling movements of the left and right hands can be more easily synchronized, and it is also easier to ensure a balance of strength of the two arms during exercise, thereby improving the balance of the human body.
Moreover, this invention is rich in functions, as it may also be fixed on the door for single-hand pull resistance training apart from hands-operated pull resistance training and hands-and-legs-operated pull resistance training.
This invention will be further illustrated with reference to the embodiments as shown in the drawings.
As shown in
The rewinding mechanism 3 comprises a supporting shaft 31 fixed inside and at a center of the case 1, and also comprises a rewinding hub 32 arranged inside the case 1 and rotatably sleeves the supporting shaft 31; the rewinding hub 32 comprises an inner cavity 321 and a winding groove 322 annularly provided outside an outer wall of the inner cavity 321; a torsion spring 33 is installed in the inner cavity 321 and is specifically a flat spiral spring; an inner end of the torsion spring 33 is fixedly hooked to a first hooking groove provided at the supporting shaft 31, and an outer end of the torsion spring 33 is fixedly hooked to a second hooking groove provided at the rewinding hub 32.
The pull strap 2 comprises a middle portion 21, as well as a first end portion 22 and a second end portion 23 respectively provided at two ends of the middle portion 21; the middle portion 21 is positioned in the inner cavity 321; the first end portion 22 passes through a first opening 323 at one side of the outer wall of the inner cavity 321 and is wound in the winding groove 322; the second end portion 23 passes through a second opening 324 at another side of the outer wall of the inner cavity 321 and is also wound in the winding groove 322; the first end portion 22 and the second end portion 23 are both wound in the winding groove 322 to form layers of winding coils defined alternately by the first end portion 22 and the second end portion 23. Specifically, the first end portion 22 passes through the first opening 323 and winds around an upper peripheral wall 3201 of the rewinding hub 32 (upper portion of the outer wall of the inner cavity), and then winds around an outer side of the second end portion 23 passing through the second opening 324; the second end portion 23 passes through the second opening 324 and winds around a lower peripheral wall 3202 of the rewinding hub 32 (lower portion of the outer wall of the inner cavity), and then winds around an outer side of the first end portion 22 passing through the first opening 323; in this way, the first end portion 22 and the second end portion 23 are wound in the wind groove 322 to form layers of winding coils defined alternately by the first end portion 22 and the second end portion 23.
An end of the first end portion 22 distal from the middle portion 21 passes through one side of the case 1 and is connected with a first handle 4; an end of the second end portion 23 distal from the middle portion 21 passes through another side of the case 1 and is connected with a second handle 5 or a fixing component 6.
When the end of the first end portion 22 distal from the middle portion 21 and the end of the second end portion 23 distal from the middle portion 21 are respectively subjected to an outwards pulling force, the rewinding hub 32 rotates clockwise about the supporting shaft 31; the torsion spring 33 is tensioned and produces the resistance to be overcome by a user when pulling the pull strap outwards; when the user pulls the pull strap outwards, the first end portion 22 and the second end portion 23 are then unwound and respectively pulled out from the case 1; when the first end portion 22 and the second end portion 23 are pulled to a target position, the user starts to release the pulling force, and the torsion spring 33 resets and drives the rewinding hub 32 to rotate anti-clockwise about the supporting shaft 31, and the first end portion 22 and the second end portion 23 are then wound and return to the case 1; thereby completing one round of pull resistance training.
The inner cavity 321 comprises a first cavity 3211 surrounding the supporting shaft 31 and defined within an inner wall of the inner cavity, and a second cavity 3212 outside the first cavity 3212; the second cavity is defined between the inner wall of the inner cavity and the outer wall of the inner cavity, and is separated from the first cavity 3211 by the inner wall of the inner cavity; the torsion spring 33 is installed in the first cavity 3211; the middle portion 21 is positioned in the second cavity 3212; one side of a side wall (the outer wall of the inner cavity 321) of the second cavity 3212 comprises the first opening 323 allowing the first end portion 22 to pass through, and another side of the side wall (the outer wall of the inner cavity 321) of the second cavity 3212 comprises the second opening 324 allowing the second end portion 23 to pass through.
The rewinding hub 32 comprises a hub body 32a and a side cover 32b; the first cavity 3211 and the second cavity 3212 are provided on the hub body 32a and having openings facing towards the side cover 32b; the side cover 32b covers the openings of the first cavity 3211 and the second cavity 3212; the hub body 32a comprises an annular stopping edge 32a1 which is provided on an outer periphery of a side of the hub body 32a distal from the side cover 32b; the winding groove 322 is defined between the annular stopping edge 32a1 and an outer peripheral edge 32b1 of the side cover 32b.
A set of limiting-and-butting blocks 32b2 is provided on an inner surface of the side cover 32b corresponding to the second cavity 3212; the set of limiting-and-butting blocks 32b2 is inserted into the second cavity 3212 and presses against the middle portion 21 of the pull strap 2, such that the middle portion 21 of the pull strap 2 is limited in the second cavity 3212 and will not be displaced circumferentially in the second cavity 3212. Therefore, even when two ends of the pull strap 2 are subjected to an outwards pulling force, the middle portion 21 of the pull strap 2 is kept limited in the second cavity 3212 without loosening.
A bottom wall of the first cavity 3211 is provided with a first through hole 325 allowing the supporting shaft 31 to pass through; the side cover 32b is provided with a second through hole 326 for the supporting shaft 31 to pass through; one bearing 327 is provided on the supporting shaft 31 adjacent the first through hole 325 and another bearing 327 is provided on the supporting shaft 31 adjacent the second through hole 326, such that the rewinding hub 32 may rotate relative to the supporting shaft 31. Two ends of the supporting shaft 31 pass through the first through hole 325 and the second through hole 326 respectively, and the two ends of the supporting shaft 31 are each connected with a hex nut 328; the case 1 is jointly formed by a first half shell 1a and a second half shell 1b joined together; inner walls of the first half shell 1a and the second half shell 1b are provided with a first inner hexagonal limiting hole 1a1 and a second inner hexagonal limiting hole 1b1 respectively; each of the inner hexagonal limiting hole 1a1 and the inner hexagonal limiting hole 1b1 allows insertion and fixation of a corresponding hex nut 328, thereby fixing the supporting shaft 31 in the case 1.
One side of the case 1 is provided with a first hole 11 allowing the end of the first end portion 22 distal from the middle portion 21 to pass through, and another side of the case is provided with a second hole 12 allowing the end of the second end portion 23 distal from the middle portion 21 to pass through; a first anti-friction sleeve 110 is inserted into the first hole 11 and allows the first end portion 22 to pass through, while a second anti-friction sleeve 120 is inserted into the second hole 12 and allows the second end portion 23 to pass through.
To maintain the center of gravity of the spring exerciser during use, the first hole 11, the second hole 12, the first opening 323, and the second opening 324 are all located on a central plane that aligns with a central axis of the supporting shaft 31, and the central axis of the supporting shaft 31 coincides with a central axis of the case 1.
The first handle 4 is detachably connected to the end of the first end portion 22 passing through the case 1, and the second handle 5 or the fixing component 6 is detachably connected to the end of the second end portion 23 passing through case 1.
Specifically, the end of the first end portion 22 passing through the case 1 is provided with a first thread connecting portion 221, and the end of the second end portion 23 passing through the case 1 is provided with a second thread connecting portion 231; the first handle 4 and the second handle 5 are of the same structure, each includes an annular grip band 451, a grip sleeve 452 wrapping around one end of the annular grip band 451, and a first thread connecting head 453; the first thread connecting head 453 is provided at another end of the annular grip band 451 and is detachably connected to the first thread connecting portion 221 or the second thread connecting portion 231; the fixing component 6 comprises a fixing band 61, a resting component 62 arranged at one end of the fixing band 61, and a second thread connecting head 63 arranged at another end of the fixing band 61 to detachably connect to the second thread connecting portion 231; an outer surface of the resting component 62 is covered with a soft protective layer 621, and the soft protective layer 621 may be foam.
When the first handle 4 is connected to the end of the first end portion 22 passing through the case 1 and the second handle 5 is connected to the end of the second end portion 23 passing through the case 1, the first handle 4 and the second handle 5 are respectively held in a left and a right hand to pull the pull strap 2 outwards to train chest muscles. In this process, the left hand and the right hand are pulling two ends of the same pull strap, and the resistance to be overcome by both hands during pulling comes from the same source, so the pulling movements of the left and right hands can be more easily synchronized, and it is easier to ensure a balance of strength of the two arms during exercise.
When the first handle 4 is connected to the end of the first end portion 22 passing through the case 1 and the fixing component 6 is connected to the end of the second end portion 23 passing through the case 1, the fixing component 6 may be fixed on a door, the first handle 4 may then be held and the pull strap 2 is then pulled in a direction away from the door, thereby realizing another form of pull resistance training. Specifically, a method to fix the fixing component 6 on the door is as follows: clamp the fixing band 61 in a gap between the door and the door frame, place the resting component 62 inside or outside the door to rest on the door or the door frame; the soft protective layer 621 on the outer surface of the resting component 62 prevents the door or the door frame from being scratched.
Furthermore, the end of the first end portion 22 and the end of the second end portion 23, both distal from the middle portion 21, pass through a left side and a right side of the case 1 respectively; an upper side of the case 1 is provided with a third thread connecting portion 13; the spring exerciser further comprises a third handle 7, and the third handle 7 comprises a first grip 72 and a second grip 73 separated from each other, and also comprises a third thread connecting head 71 to be detachably connected with the third thread connecting portion 13.
When the first handle 4 is connected to the end of the first end portion 22 passing through the case 1, the second handle 5 is connected to the end of the second end portion 23 passing through the case 1, and the third handle 7 is threaded to the third thread connecting portion 13, the annular grip bands 451 of the first handle 4 and the second handle 5 act as pedals for both feet to step on; the third handle 7 is held in hands and pulled upwards; in this kind of implementation, the two ends of the pull strap will also be pulled outwards, thereby realizing pull resistance training with the use of pedals.
The first thread connecting portion 221 and the second thread connecting portion 231 are connectors respectively provided with a first threaded hole 2210 and a second threaded hole 2310; the first thread connecting head 453 and the second thread connecting head 63 are connectors respectively provided with a first screw bolt 4530 and a second screw bolt 630; the third thread connecting portion 13 is a screw nut fixedly embedded on the upper side of the case 1; the third thread connecting head 71 is also a connector provided with a third screw bolt 710.
To provide more ways to implement the present invention, each of the first screw bolt 4530 on the first thread connecting head 453, the second screw bolt 630 on the second thread connecting head 63, and the third screw bolt 710 on the third thread connecting head 71 may be sized to match inner bores of all the first threaded hole 2210, the second threaded hole 2310, and the screw nut, such that the first handle 4, the second handle 5, the fixing component 6 and the third handle 7 may be connected to any one of the first thread connecting portion 221, the second thread connecting portion 231, and the third thread connecting portion 13 according to actual needs.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202211541939.X | Dec 2022 | CN | national |
