A pull-up device

Abstract

The present application relates to a kind of tensioners, including shell, pull rope and reel mechanism;Reel mechanism includes the support shaft fixed in the central position in shell and the rope wheel being rotatably sleeved on support shaft in shell, and rope wheel has internal cavity and reel groove being arranged around the outer periphery of internal cavity, torsion spring is installed in internal cavity, one end of torsion spring is fixed on support shaft, the other end is fixed on rope wheel;Pull rope includes middle part, first end head part and second end head part, middle part is confined in internal cavity, first end head part is from the side of internal cavity and is around set in reel groove, second end head part is also from the other side of internal cavity and is around set in reel groove, and first end head part and second end head part are staggered and stacked arrangement in reel groove.The present application tensioner not only simple and reasonable structure, production and manufacture are convenient, low in cost, and left and right hand stretching exercise is synchronous and good in balanced nature of double-arm strength, and function is rich.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of tensioners, belong to the field of fitness equipment. BACKGROUND

[0002] Chinese patent ZL201621348859.2 discloses a tensioner, which is composed of left and right two tension devices by connecting shaft and can be rotatably connected into one body. This tensioner is designed separately because left and right tension devices are separated, i.e. each tension device has independent components such as rope, sheave, coil spring, etc. Therefore, it has the following defects: 1) numerous parts, the structure is relatively complex, not only inconvenient to produce and manufacture, but also high in cost; 2) when users exercise through left and right tension devices, it is difficult to ensure the synchronization of left and right hand stretching exercise in operation, and it is also difficult to ensure the balance of left and right hand stretching exercise in arm strength, thereby affecting the human body exercise effect; 3) the tensioner only has two use forms of hand stretching exercise and foot stretching exercise, the function is relatively thin, and needs to be further improved. SUMMARY

[0003] The present application aims to overcome the shortcomings of the prior art, and provide a tensioner with simple and reasonable structure, convenient production and manufacture, low cost, good synchronization and balance of left and right hand stretching exercise, and rich functions.

[0004] The object of the present application is achieved by the following technical solution:

[0005] A tensioner includes a housing, a rope and a rope winding mechanism. The rope winding mechanism includes a support shaft fixed at the center of the housing and a sheave rotatably sleeved on the support shaft in the housing. The sheave has an internal cavity and a rope winding groove arranged around the outer periphery of the internal cavity. A torsion spring is installed in the internal cavity, with one end fixed on the support shaft and the other end fixed on the sheave. The rope includes a middle part and first and second end head parts at both ends of the middle part. The middle part is confined in the internal cavity. The first end head part passes out of a first opening on one side of the internal cavity and is arranged around the rope winding groove. The second end head part passes out of a second opening on the other side of the internal cavity and is also arranged around the rope winding groove. The first and second end head parts are arranged in staggered layers in the rope winding groove. One end of the first end head part away from the middle part passes out of one side of the housing and is connected with a first handle. One end of the second end head part away from the middle part passes out of the other side of the housing and is connected with a second handle or a fixing member.

[0006] Further, the first end portion is first wound around the upper peripheral wall of the rope wheel and then laminated and wound outside the second end portion after the first end portion is pulled out of the first opening. The second end portion is first wound around the lower peripheral wall of the rope wheel and then laminated and wound outside the first end portion after the second end portion is pulled out of the second opening. In this way, the first end portion and the second end portion are arranged in an interlaced and laminated manner in the rope winding groove.

[0007] Further, the internal cavity includes a first cavity arranged around the outer periphery of the support shaft and a second cavity arranged around the outer periphery of the first cavity and separated from the first cavity. The torsion spring is installed in the first cavity, the intermediate portion is defined in the second cavity, and the first opening for the first end portion to pass through is arranged on one side wall of the second cavity, and the second opening for the second end portion to pass through is arranged on the other side wall of the second cavity.

[0008] Further, the rope wheel includes a wheel body and a side cover. The first cavity and the second cavity are both arranged on the wheel body and open towards the side cover. The side cover covers the open ends of the first cavity and the second cavity. The outer periphery of the wheel body away from the side cover is provided with an annular stopper rim, and the annular stopper rim and the outer periphery of the side cover form the rope winding groove.

[0009] Further, a group of limiting stop blocks are protruded on the inner side of the side cover corresponding to the position of the second cavity. The group of limiting stop blocks are inserted into the second cavity to tightly abut against the intermediate portion of the pull rope, so that the intermediate portion of the pull rope is defined in the second cavity and cannot be displaced in the circumferential direction.

[0010] Further, a first through hole for the support shaft to pass through is arranged on the bottom wall of the first cavity, and a second through hole for the support shaft to pass through is arranged on the side cover. Bearings are arranged between the support shaft and the first through hole and the second through hole. The two ends of the support shaft pass through the first through hole and the second through hole respectively, and the two ends of the support shaft are respectively connected with an outer hexagonal nut. The shell is composed of two half shells which are oppositely connected. Inner hexagonal limiting holes for the corresponding outer hexagonal nuts to be embedded and fixed are arranged on the inner walls of the two half shells.

[0011] Further, the two sides of the shell are respectively provided with a first through hole for the one end of the first end portion away from the intermediate portion to pass through and a second through hole for the one end of the second end portion away from the intermediate portion to pass through. The first through hole, the second through hole, the first opening and the second opening are all in the same central plane as the central axis of the support shaft.

[0012] Further, the first through hole is sleeved with a first anti-friction sleeve for the first end head part to pass through, and the second through hole is sleeved with a second anti-friction sleeve for the second end head part to pass through.

[0013] Further, the first handle is detachably connected with one end of the first end head part out of the shell, and the second handle or the fixing member is detachably connected with one end of the second end head part out of the shell.

[0014] Further, one end of the first end head part out of the shell is provided with a first threaded connecting part, and one end of the second end head part out of the shell is provided with a second threaded connecting part; the first handle and the second handle are identical in structure, and both include a ring-shaped handle belt, a handle sleeve wrapped at one end of the ring-shaped handle belt, and a first threaded connecting head provided at the other end of the ring-shaped handle belt and used for detachable threaded connection with the first threaded connecting part or the second threaded connecting part; the fixing member includes a fixing belt, a stopper provided at one end of the fixing belt, and a second threaded connecting head provided at the other end of the fixing belt and used for detachable threaded connection with the second threaded connecting part, and the outer surface of the stopper is covered with a flexible protective layer.

[0015] Further, one end of the first end head part and one end of the second end head part away from the middle part are respectively out of the left and right sides of the shell, the upper side of the shell is provided with a third threaded connecting part, and the tensile device further includes a third handle, which includes two separated hand holding positions and a third threaded connecting head used for detachable threaded connection with the third threaded connecting part.

[0016] The beneficial effects of the present application are as follows:

[0017] Firstly, the tensile device of the present application adopts the structure of a single tensile rope and a single torsion spring, which is more simple and compact in structure, more convenient in production and manufacturing, and lower in cost compared with the prior art; in addition, since the left and right hands respectively stretch the two ends of the same tensile rope during stretching exercise, and the resistance sources to be overcome during stretching are the same torsion spring, it is easier to ensure the synchronization of the left and right hands during stretching exercise in operation, and it is also easier to ensure the balance of the left and right hands during stretching exercise in arm strength, thereby improving the balance of the human body.

[0018] Secondly, the tensile device of the present application can not only perform double-hand tensile exercise and foot-pedal tensile exercise, but also can be fixed on a door to perform single-hand tensile exercise, so that the use function is more abundant and perfect. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a three-dimensional schematic view of one use form of the tensile device of the present application.

[0020] Figure 2 This is a bottom view of the main body of the tensioner in this invention.

[0021] Figure 3 yes Figure 2 Schematic diagram of cross section AA.

[0022] Figure 4 yes Figure 2 Schematic diagram of cross section of BB.

[0023] Figure 5 This is an exploded schematic diagram of the main body of the tensioner in this invention.

[0024] Figure 6 This is a schematic diagram of the structure of the wheel body in this invention.

[0025] Figure 7 This is a schematic diagram of the pull rope structure in this invention.

[0026] Figure 8 This is a schematic diagram of the structure of the first handle or the second handle in this invention.

[0027] Figure 9 This is a three-dimensional schematic diagram of another application of the tensioner of the present invention.

[0028] Figure 10 This is a structural schematic diagram of the fastener in this invention.

[0029] Figure 11 This is a three-dimensional schematic diagram of another application of the tensioner of the present invention.

[0030] Figure 12 This is a schematic diagram of the structure of the second handle in this invention. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the embodiments given in the accompanying drawings.

[0032] like Figures 1 to 12 As shown, the present invention provides a tensioner, comprising a housing 1, a pull rope 2, and a rope winding mechanism 3.

[0033] The rope winding mechanism 3 includes a support shaft 31 fixed at the center of the housing 1 and a rope wheel 32 disposed inside the housing 1 and rotatably mounted on the support shaft 31. The rope wheel 32 has an internal cavity 321 and a rope winding groove 322 arranged around the outer periphery of the internal cavity 321. A torsion spring 33 is installed in the internal cavity 321. The torsion spring 33 is specifically a planar spiral spring, with its inner end fixedly hooked in a first hooking groove preset on the support shaft 31 and its outer end fixedly hooked in a second hooking groove preset on the rope wheel 32.

[0034] The pull rope 2 comprises a middle portion 21 and first and second end portions 22 and 23 located at two ends of the middle portion 21, the middle portion 21 is defined in an internal cavity 321, the first end portion 22 is led out from a first opening 323 at one side of the internal cavity 321 and wound around a winding groove 322, the second end portion 23 is led out from a second opening 324 at the other side of the internal cavity 321 and also wound around the winding groove 322, and the first and second end portions 22 and 23 are arranged in an interlaced and stacked manner in the winding groove 322. Specifically, after the first end portion 22 is led out from the first opening 323, it is first wound around an upper peripheral wall 3201 of the rope wheel 32 and then stacked and wound outside the second end portion 23 led out from the second opening 324; after the second end portion 23 is led out from the second opening 324, it is first wound around a lower peripheral wall 3202 of the rope wheel 32 and then stacked and wound outside the first end portion 22 led out from the first opening 323; in this way, the first and second end portions 22 and 23 are arranged in an interlaced and stacked manner in the winding groove 322.

[0035] An end of the first end portion 22 away from the middle portion 21 is led out from one side of the shell 1 and connected with the first handle 4, and an end of the second end portion 23 away from the middle portion 21 is led out from the other side of the shell 1 and connected with the second handle 5 or the fixing member 6.

[0036] When the ends of the first and second end portions 22 and 23 away from the middle portion 21 are subjected to external pulling forces respectively, the rope wheel 32 rotates forward relative to the support shaft 31, the torsion spring 33 is stretched and generates a resistance to be overcome by the exerciser to pull the pull rope outward, the first and second end portions 22 and 23 are unwound and pulled outward from the shell 1 respectively, when the first and second end portions 22 and 23 are stretched to target positions, the exerciser starts to release the force, the torsion spring 33 is reset and drives the rope wheel 32 to rotate reversely relative to the support shaft 31, the first and second end portions 22 and 23 are wound and recovered from the shell 1 outward, thereby completing a pulling exercise process.

[0037] The internal cavity 321 comprises a first cavity 3211 arranged around the outer periphery of the support shaft 31 and a second cavity 3212 arranged around a part of the outer periphery of the first cavity 3211 and separated from the first cavity 3211, the torsion spring 33 is installed in the first cavity 3211, the middle portion 21 is defined in the second cavity 3212, and a side wall of the second cavity 3212 is provided with the first opening 323 for the first end portion 22 to pass through, and the other side wall of the second cavity 3212 is provided with the second opening 324 for the second end portion 23 to pass through.

[0038] The rope wheel 32 comprises a wheel body 32a and a side cover 32b, the first accommodating cavity 3211 and the second accommodating cavity 3212 are both formed on the wheel body 32a and open towards the side cover 32b, the side cover 32b covers the open ends of the first accommodating cavity 3211 and the second accommodating cavity 3212, and an annular stopper rim 32a1 is protruded on the outer periphery of the wheel body 32a away from the side cover 32b, and the rope winding groove 322 is formed between the annular stopper rim 32a1 and the outer periphery 32b1 of the side cover 32b.

[0039] A set of limiting stopper blocks 32b2 are protruded on the inner side of the side cover 32b at the position corresponding to the second accommodating cavity 3212, the set of limiting stopper blocks 32b2 are inserted into the second accommodating cavity 3212 to tightly abut against the middle portion 21 of the pull rope 2, so that the middle portion 21 of the pull rope 2 is limited in the second accommodating cavity 3212 and cannot be displaced in the circumferential direction, and even when the two ends of the pull rope 2 are subjected to external pulling force, the middle portion 21 of the pull rope 2 is always limited in the second accommodating cavity 3212 and cannot be loosened.

[0040] A first through hole 325 is formed on the bottom wall of the first accommodating cavity 3211 and penetrates the supporting shaft 31, a second through hole 326 is formed on the side cover 32b and penetrates the supporting shaft 31, and a bearing 327 is arranged between the supporting shaft 31 and the first through hole 325 and the second through hole 326, so that the rope wheel 32 can rotate relative to the supporting shaft 31. The two ends of the supporting shaft 31 respectively penetrate the first through hole 325 and the second through hole 326, and the two ends of the supporting shaft 31 are respectively connected with an outer hexagonal nut 328, the shell 1 is composed of two half shells 1a and 1b which are oppositely connected, and the inner walls of the two half shells 1a and 1b are respectively provided with an inner hexagonal limiting hole 1a1 and 1b1 for embedding and fixing the corresponding outer hexagonal nut 328, so that the supporting shaft 31 is fixed in the shell 1.

[0041] The two sides of the shell 1 are respectively provided with a first through hole 11 for the end of the first end head portion 22 away from the middle portion 21 to penetrate and a second through hole 12 for the end of the second end head portion 23 away from the middle portion 21 to penetrate, a first anti-friction sleeve 110 is sleeved in the first through hole 11 for the first end head portion 22 to penetrate, and a second anti-friction sleeve 120 is sleeved in the second through hole 12 for the second end head portion 23 to penetrate.

[0042] In order to ensure that the center of gravity of the pull force device is stable during use, the first through hole 11, the second through hole 12, the first opening 323 and the second opening 324 are all on the same central plane as the central axis of the supporting shaft 31, and the central axis of the supporting shaft 31 coincides with the central axis of the shell 1.

[0043] The first handle 4 is detachably connected to the end of the first end portion 22 penetrating the shell 1, and the second handle 5 or the fixing member 6 is detachably connected to the end of the second end portion 23 penetrating the shell 1.

[0044] Specifically, the end of the first end portion 22 penetrating the shell 1 is provided with a first threaded connecting portion 221, and the end of the second end portion 23 penetrating the shell 1 is provided with a second threaded connecting portion 231; the first handle 4 and the second handle 5 are identical in structure, both of which include a ring-shaped grip belt 451, a grip sleeve 452 wrapped at one end of the ring-shaped grip belt 451, and a first threaded connecting head 453 provided at the other end of the ring-shaped grip belt 451 for detachable threaded connection with the first threaded connecting portion 221 or the second threaded connecting portion 231; the fixing member 6 includes a fixing belt 61, a stopper 62 provided at one end of the fixing belt 61, and a second threaded connecting head 63 provided at the other end of the fixing belt 61 for detachable threaded connection with the second threaded connecting portion 231, and the outer surface of the stopper 62 is covered with a flexible protective layer 621, which can be foam.

[0045] When the first handle 4 and the second handle 5 are connected to the end of the first end portion 22 penetrating the shell 1 and the end of the second end portion 23 penetrating the shell 1 respectively, the left and right hands of the exerciser can hold the first handle 4 and the second handle 5 respectively to stretch the pull rope 2 outward, so as to perform chest expansion resistance exercise. In this process, since the left and right hands stretch the two ends of the same pull rope respectively, and the resistance to be overcome is the same, on the one hand, it is easier to ensure the synchronization of the left and right hands in stretching exercise, and on the other hand, it is easier to ensure the balance of the left and right arms in stretching exercise.

[0046] When the first handle 4 and the fixing member 6 are connected to the end of the first end portion 22 penetrating the shell 1 and the end of the second end portion 23 penetrating the shell 1 respectively, the exerciser can fix the fixing member 6 on the door, and then hold the first handle 4 to stretch the pull rope 2 away from the door, so as to realize another form of resistance exercise. Specifically, the fixing member 6 is fixed on the door by clamping the fixing belt 61 in the gap between the door body and the door frame, and placing the stopper 62 on the inner side or the outer side of the door to be stopped by the door body or the door frame, and the flexible protective layer 621 on the outer surface of the stopper 62 can prevent scratching the door body or the door frame.

[0047] Further, the first end portion 22 and the second end portion 23 are respectively arranged to extend out of the left and right sides of the shell 1, and the upper side of the shell 1 is provided with a third threaded connection portion 13. The tension device further comprises a third handle 7, which comprises two separated hand holding positions 72, 73 and a third threaded connection head 71 for detachable connection with the third threaded connection portion 13. When the first handle 4 and the second handle 5 are respectively connected with the end of the first end portion 22 and the end of the second end portion 23 extending out of the shell 1, and the third handle 7 is screwed on the third threaded connection portion 13, the exerciser can use the annular holding belt 451 of the first handle 4 and the second handle 5 as foot pedals for stepping with both feet, and hold the third handle 7 with hands to pull the tension device upward. At this time, the two ends of the pull rope 2 are also stretched outward, so as to realize the use form of foot pedal tension exercise.

[0048] The first threaded connection portion 221 and the second threaded connection portion 231 are connecting members with threaded holes 2210, 2310, the first threaded connection head 453 and the second threaded connection head 63 are connecting members with threaded columns 4530, 630, and the third threaded connection portion 13 is a nut fixedly embedded on the upper side of the shell 1. The third threaded connection head 71 is also a connecting member with a threaded column 710.

[0049] In addition, in order to broaden the use form, the threaded columns on the first threaded connection head 453, the second threaded connection head 63 and the third threaded connection head 71 can be designed to be compatible with the size of the threaded holes and the inner hole of the nut. In this way, the first handle 4, the second handle 5, the fixed member 6 and the third handle 7 can be arbitrarily switched between the first threaded connection portion 221, the second threaded connection portion 231 and the third threaded connection portion 13 according to the use requirements.

[0050] The above description is only the preferred embodiment of the present application, and cannot limit the scope of the present application. Any simple equivalent changes and modifications made according to the scope of the present application and the content of the present application are still within the scope of the present application.

Claims

1. A tensioning device, comprising a housing, a pulling rope, and a rope winding mechanism; characterized in that: The rope winding mechanism includes a support shaft fixed at the center of the housing and a rope wheel disposed inside the housing and rotatably mounted on the support shaft. The rope wheel has an internal cavity and a rope winding groove arranged around the outer periphery of the internal cavity. A torsion spring is installed in the internal cavity, with one end of the torsion spring fixed on the support shaft and the other end fixed on the rope wheel. The pull rope includes a middle portion and a first end portion and a second end portion located at both ends of the middle portion. The middle portion is defined within the internal cavity. The first end portion extends through a first opening on one side of the internal cavity and is wound around the rope groove. The second end portion extends through a second opening on the other side of the internal cavity and is also wound around the rope groove. The first end portion and the second end portion are arranged in an alternating layer within the rope groove. One end of the first end portion, away from the middle portion, protrudes from one side of the housing and is connected to a first handle; one end of the second end portion, away from the middle portion, protrudes from the other side of the housing and is connected to a second handle or a fixing member. After the first end portion passes through the first opening, it first wraps around the upper outer peripheral wall of the rope wheel, and then is layered and wound around the outside of the second end portion that passes through the second opening; after the second end portion passes through the second opening, it first wraps around the lower outer peripheral wall of the rope wheel, and then is layered and wound around the outside of the first end portion that passes through the first opening; in this way, the first end portion and the second end portion are arranged in an alternating layered manner in the rope winding groove; The internal cavity includes a first cavity arranged around the outer periphery of the support shaft and a second cavity arranged around the outer periphery of a portion of the first cavity and separated from the first cavity. The torsion spring is installed in the first cavity, the middle portion is defined in the second cavity, and a first opening for the first end portion to pass through is provided on one side wall of the second cavity, and a second opening for the second end portion to pass through is provided on the other side wall of the second cavity. The rope pulley includes a pulley body and a side cover. The first cavity and the second cavity are both opened on the pulley body and open to the side cover. The side cover covers the open ends of the first cavity and the second cavity. An annular stop flange is provided on the outer periphery of the side of the pulley body away from the side cover. The annular stop flange and the outer periphery of the side cover form the rope groove. A set of limiting blocks is protruding on the inner side of the side cover corresponding to the position of the second cavity. The set of limiting blocks is inserted into the second cavity to press the middle part of the pull rope tightly, thereby confining the middle part of the pull rope within the second cavity and preventing it from displacing circumferentially.

2. The tensioner according to claim 1, characterized in that: The bottom wall of the first cavity has a first through hole for the support shaft to pass through, and the side cover has a second through hole for the support shaft to pass through. Bearings are provided between the support shaft and the first and second through holes. The two ends of the support shaft pass through the first and second through holes respectively, and an external hexagonal nut is connected to the two protruding parts of the support shaft. The housing is composed of two half-housings facing each other. The inner walls of the two half-housings are respectively provided with internal hexagonal limiting holes for the corresponding external hexagonal nuts to be embedded and fixed.

3. The tensioner according to claim 1, characterized in that: The housing has a first through hole on each side for the end of the first end portion away from the middle portion to pass through, and a second through hole for the end of the second end portion away from the middle portion to pass through. The first through hole, the second through hole, the first opening and the second opening are all on the same central plane as the central axis of the support shaft.

4. The tensioner according to claim 3, characterized in that: The first perforation is fitted with a first anti-friction sleeve for the first end portion to pass through, and the second perforation is fitted with a second anti-friction sleeve for the second end portion to pass through.

5. A tensioner according to claim 1, characterized in that: The first handle is detachably connected to one end of the housing protruding from the first end portion, and the second handle or the fixing member is detachably connected to one end of the housing protruding from the second end portion.

6. A tensioner according to claim 5, characterized in that: The first end portion has a first threaded connection at one end protruding from the housing, and the second end portion has a second threaded connection at one end protruding from the housing. The first handle and the second handle have the same structure, both including an annular grip, a grip sleeve wrapped around one end of the annular grip, and a first threaded connector at the other end of the annular grip for detachably threaded connection with the first threaded connection or the second threaded connection. The fixing member includes a fixing band, a stop at one end of the fixing band, and a second threaded connector at the other end of the fixing band for detachably threaded connection with the second threaded connection. The outer surface of the stop is covered with a flexible protective layer.

7. The tensioner according to claim 1, characterized in that: The first end portion and the second end portion, respectively, extend from the left and right sides of the housing. The upper side of the housing is provided with a third threaded connection portion. The tensioner also includes a third handle, which includes two separate hand grips and a third threaded connector for detachably threaded connection with the third threaded connection portion.

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