CN210409397U - Hollow combined training apparatus - Google Patents

Abstract

The utility model relates to the technical field of auxiliary devices of sports equipment, in particular to a hollow combined training instrument which is suitable for people with various heights and reduces the use limitation; comprises a left base, a right base and a cross bar; still include left supporting mechanism, right supporting mechanism, left bolt and right bolt, left side supporting mechanism and right supporting mechanism bottom are installed respectively on left base and right base, left side supporting mechanism includes left connecting rod, first left pivot, the left pivot of second, left worm wheel, left worm, left threaded rod, left dead lever and left elevator, left connecting rod bottom is connected with left base, the inside left installation cavity that is provided with of left connecting rod, left connecting rod right side wall intercommunication is provided with the left ferry mouth of crossing, left elevator is provided with left screw hole and the spacing hole in a left side, left installation cavity inside bottom wall is provided with left standing groove, left standing groove department is provided with first left ball bearing.

Description

Hollow combined training apparatus

Technical Field

The utility model relates to a sport equipment auxiliary device's technical field especially relates to a cavity combination training apparatus.

Background

As is well known, a hollow combined training apparatus is an auxiliary device for exercising the arms of a user in daily life or during physical training, and is widely used in the field of sports equipment; the existing hollow combined training instrument comprises a left connecting rod, a right connecting rod, a left base, a right base and a cross rod, wherein the bottom ends of the left connecting rod and the right connecting rod are respectively connected with the left base and the right base, and the top ends of the left connecting rod and the right connecting rod are respectively connected with the left end and the right end of the cross rod; when the existing hollow combined training instrument is used, the bottom ends of the left base and the right base are fixed on the ground, the cross rod, the left connecting rod and the right connecting rod form a door shape, and a user holds the cross rod with both hands to finish pull-up action; the discovery in the use of current cavity combination training apparatus, the height of horizontal pole is not convenient for adjust according to user's height, leads to horizontal pole height and user's height to mismatch, and the user limitation is higher.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a cavity combination training apparatus suitable for the crowd of various heights reduces and uses the limitation.

The utility model relates to a hollow combined training apparatus, which comprises a left base, a right base and a cross bar; the left support mechanism and the right support mechanism are respectively arranged on a left base and a right base, the left support mechanism comprises a left connecting rod, a first left rotating shaft, a second left rotating shaft, a left worm wheel, a left worm, a left threaded rod, a left fixed rod and a left lifting block, the bottom end of the left connecting rod is connected with the left base, a left mounting cavity is arranged inside the left connecting rod, a left transition port is arranged on the right side wall of the left connecting rod in a communicating manner, the left lifting block is provided with a left threaded hole and a left limiting hole, the inner bottom wall of the left mounting cavity is provided with a left placing groove, a first left ball bearing is arranged at the left placing groove, the bottom end of the first left rotating shaft is in key connection with the first left ball bearing, the left fixed rod passes through the left limiting hole, and the top end and the bottom end of the left fixed rod are respectively connected with the inner top wall and the inner bottom wall of, the bottom end of the left threaded rod penetrates through a left threaded hole and then is connected with the top end of a first left rotating shaft, the first left rotating shaft is connected with a left worm wheel key, the front side wall of the left connecting rod is provided with a left mounting opening in a communicating manner, a second left ball bearing is arranged at the left mounting opening, a second left rotating shaft is connected with a second left ball bearing key, a second left rotating shaft is connected with a left worm wheel key, the left worm is meshed with the left worm wheel, the front end of the second left rotating shaft is provided with a left rotating disc, the right supporting mechanism comprises a right connecting rod, a first right rotating shaft, a second right rotating shaft, a right worm wheel, a right worm, a right threaded rod, a right fixed rod and a right lifting block, the bottom end of the right connecting rod is connected with a right base, a right mounting cavity is arranged inside the right connecting rod, the left side wall of the right connecting rod is provided with a right transition opening in a communicating manner, a first right ball bearing is arranged at the right placing groove, the bottom end of a first right rotating shaft is in key connection with the first right ball bearing, the right fixing rod penetrates through a right limiting hole, the top end and the bottom end of the right fixing rod are respectively connected with the top side wall and the inner bottom side wall of a right mounting cavity, the bottom end of a right threaded rod is in threaded connection with a right threaded hole and then is connected with the top end of the first right rotating shaft, the first right rotating shaft is in key connection with a right worm wheel, the front side wall of the right connecting rod is communicated with a right mounting opening, a second right ball bearing is arranged at the right mounting opening, the second right rotating shaft is in key connection with the second right ball bearing, a second right rotating shaft is in key connection with a right worm, the right worm is meshed with the right worm wheel, the front end of the second right rotating shaft is provided with a right turntable, the right end of a left lifting block and the left end of the right lifting block are respectively provided with a, horizontal pole left end and right-hand member are provided with left mounting ring and right mounting ring respectively, and left mounting ring and right mounting ring border region are provided with the right mounting hole of the left mounting hole multiunit of multiunit respectively, every group left side bolt all passes a set of left side fixed orifices and a set of left side mounting hole, every group right side bolt all passes a set of right side fixed orifices and a set of right side mounting hole.

The utility model discloses a cavity combination training apparatus, left side connecting rod rear side wall intercommunication is provided with left fixed mouthful, and left fixed mouthful department is provided with left ball bearing of third, second left side pivot rear end and left ball bearing key-type connection of third, right side connecting rod rear side wall intercommunication is provided with right fixed mouthful, and right fixed mouthful department is provided with right ball bearing of third, second right side pivot rear end and right ball bearing key-type connection of third.

The utility model discloses a cavity combination training apparatus still includes third left pivot and third right pivot, and left side installation cavity inside top lateral wall is provided with left mounting groove, and left side mounting groove department is provided with fourth left ball bearing, third left pivot top and fourth left ball bearing key-type connection, third left pivot bottom and left threaded rod top are connected, and right installation cavity inside top lateral wall is provided with right mounting groove, and right mounting groove department is provided with fourth right ball bearing, third right pivot top and fourth right ball bearing key-type connection, third right pivot bottom and right threaded rod top are connected.

The utility model discloses a cavity combination training apparatus still includes the first left nut of four groups and the first right nut of four groups, the first left nut of four groups spiral shell dress is to four left bolts of group respectively on, the first right nut of four groups spiral shell dress is to four right bolts of group respectively on.

The utility model discloses a cavity combination training apparatus still includes second left nut and second right nut, second left pivot and second right pivot outside wall part region all are provided with the external screw thread, second left nut and second right nut spiral shell dress are respectively to second left pivot and second right pivot.

The utility model discloses a cavity combination training apparatus, left side dead lever and right dead lever all are cylindricly.

The utility model discloses a cavity combination training apparatus, all be provided with the non-slip raised on left side carousel and the right side carousel lateral wall.

The utility model discloses a cavity combination training apparatus, left side connecting rod top lateral wall intercommunication is provided with left oiling mouth, right side connecting rod top lateral wall intercommunication is provided with right oiling mouth.

Compared with the prior art, the beneficial effects of the utility model are that: the left base and the right base are both fixed on the ground, the left rotary disc is rotated, under the mutual matching of the second left rotary shaft and the second left ball bearing, the left worm can rotate, under the mutual matching of the first left ball bearing, the first left rotary shaft and the left worm wheel, the left rotary disc rotates to enable the left screw rod to rotate, as the left screw rod is screwed and penetrates through the left lifting block and cannot rotate under the mutual matching of the left fixed rod, the left rotary disc rotates to enable the height of the left lifting block to change, the right rotary disc rotates, under the mutual matching of the second right rotary shaft and the second right ball bearing, the right worm can rotate, as the right screw rod is screwed and penetrates through the right lifting block and cannot rotate under the mutual matching of the right fixed rod, the right rotary disc rotates to enable the height of the right lifting block to change, adjust the height of left lifting block and right lifting block according to user's height, altitude mixture control is to unanimous back, make four left bolts of group pass left side solid fixed ring and right fixed ring, make four right bolts of group pass right fixed ring and right fixed ring, with the horizontal pole rigidity, then the horizontal pole is held to user's both hands, accomplish the chin action, the horizontal pole highest height is by the high decision of left connecting rod and right connecting rod, applicable in adult or children use, adjust the horizontal pole position to the best, in order to reach the best training state, the crowd who is applicable to various heights, reduce and use the limitation.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a perspective view of the left connecting rod, the second left rotating shaft, the second ball bearing, the left rotating shaft, the anti-slip protrusions and the second left nut;

FIG. 4 is a schematic top view of the connection of the left connecting rod, the first left rotating shaft, the second left rotating shaft, the left worm gear, the left worm, the second left ball bearing and the third left ball bearing;

in the drawings, the reference numbers: 1. a left base; 2. a cross bar; 3. a left bolt; 4. a left connecting rod; 5. a first left rotating shaft; 6. a second left rotating shaft; 7. a left worm gear; 8. a left worm; 9. a left threaded rod; 10. a left fixed link; 11. a left lifting block; 12. a first left ball bearing; 13. a second ball bearing; 14. a left turn plate; 15. a left retaining ring; 16. a left mounting ring; 17. a third left ball bearing; 18. a third left rotating shaft; 19. a fourth left ball bearing; 20. a first left nut; 21. a second left nut; 22. anti-skid projections; 23. and a left oil filling port.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 4, the hollow combined training apparatus of the present invention comprises a left base 1, a right base and a cross bar 2; the left support mechanism and the right support mechanism are respectively arranged on a left base 1 and a right base, the left support mechanism comprises a left connecting rod 4, a first left rotating shaft 5, a second left rotating shaft 6, a left worm wheel 7, a left worm 8, a left threaded rod 9, a left fixed rod 10 and a left lifting block 11, the bottom end of the left connecting rod 4 is connected with the left base 1, a left installation cavity is arranged inside the left connecting rod 4, the right side wall of the left connecting rod 4 is communicated with a left transition port, the left lifting block 11 is provided with a left threaded hole and a left limiting hole, the bottom side wall in the left installation cavity is provided with a left placing groove, the left placing groove is provided with a first left ball bearing 12, the bottom end of the first left rotating shaft 5 is connected with the first left ball bearing 12 in a key mode, the left fixed rod 10 penetrates through the left limiting hole, and the top end and the bottom end of the left fixed rod 10 are respectively connected with the top side wall and the inner bottom wall of, the bottom end of a left threaded rod 9 is threaded through a left threaded hole and then connected with the top end of a first left rotating shaft 5, the first left rotating shaft 5 is connected with a left worm wheel 7 key, the front side wall of a left connecting rod 4 is provided with a left mounting opening in a communicating manner, a second left ball bearing 13 is arranged at the left mounting opening, a second left rotating shaft 6 is connected with a second left ball bearing 13 key, the second left rotating shaft 6 is connected with a left worm 8 key, the left worm 8 is meshed with the left worm wheel 7, the front end of the second left rotating shaft 6 is provided with a left turntable 14, a right supporting mechanism comprises a right connecting rod, a first right rotating shaft, a second right rotating shaft, a right worm wheel, a right worm, a right threaded rod, a right fixed rod and a right lifting block, the bottom end of the right connecting rod is connected with a right base, a right mounting cavity is arranged inside the right connecting rod, the left side wall of the right connecting rod is provided with a right transition opening in, a first right ball bearing is arranged at the right placing groove, the bottom end of a first right rotating shaft is connected with the first right ball bearing in a key mode, a right fixing rod penetrates through a right limiting hole, the top end and the bottom end of the right fixing rod are respectively connected with the inner top side wall and the inner bottom side wall of the right mounting cavity, the bottom end of a right threaded rod penetrates through a right threaded hole in a screw mode and is connected with the top end of the first right rotating shaft, the first right rotating shaft is connected with a right worm wheel in a key mode, the front side wall of a right connecting rod is communicated with a right mounting opening, a second right ball bearing is arranged at the right mounting opening and is connected with a second right ball bearing in a key mode, a second right rotating shaft is connected with a right worm wheel in a key mode, a right worm is meshed with the right worm wheel, a right rotating disc is arranged at the front end of the second right rotating shaft, a left fixing ring 15 and a right fixing ring are respectively arranged at the right end, the left end and the right end of the cross rod 2 are respectively provided with a left mounting ring 16 and a right mounting ring, the edge areas of the left mounting ring 16 and the right mounting ring are respectively provided with a plurality of groups of left mounting holes and a plurality of groups of right mounting holes, each group of left bolts 3 passes through a group of left fixing holes and a group of left mounting holes, and each group of right bolts passes through a group of right fixing holes and a group of right mounting holes; the left base and the right base are both fixed on the ground, the left rotary disc is rotated, under the mutual matching of the second left rotary shaft and the second left ball bearing, the left worm can rotate, under the mutual matching of the first left ball bearing, the first left rotary shaft and the left worm wheel, the left rotary disc rotates to enable the left screw rod to rotate, as the left screw rod is screwed and penetrates through the left lifting block and cannot rotate under the mutual matching of the left fixed rod, the left rotary disc rotates to enable the height of the left lifting block to change, the right rotary disc rotates, under the mutual matching of the second right rotary shaft and the second right ball bearing, the right worm can rotate, as the right screw rod is screwed and penetrates through the right lifting block and cannot rotate under the mutual matching of the right fixed rod, the right rotary disc rotates to enable the height of the right lifting block to change, adjust the height of left lifting block and right lifting block according to user's height, altitude mixture control is to unanimous back, make four left bolts of group pass left side solid fixed ring and right fixed ring, make four right bolts of group pass right fixed ring and right fixed ring, with the horizontal pole rigidity, then the horizontal pole is held to user's both hands, accomplish the chin action, the horizontal pole highest height is by the high decision of left connecting rod and right connecting rod, applicable in adult or children use, adjust the horizontal pole position to the best, in order to reach the best training state, the crowd who is applicable to various heights, reduce and use the limitation.

The utility model discloses a hollow combined training apparatus, the rear side wall of a left connecting rod 4 is communicated with a left fixing port, the left fixing port is provided with a third left ball bearing 17, the rear end of a second left rotating shaft 6 is connected with the third left ball bearing 17 key, the rear side wall of a right connecting rod is communicated with a right fixing port, the right fixing port is provided with a third right ball bearing, and the rear end of the second right rotating shaft is connected with the third right ball bearing key; and the third left ball bearing and the third right ball bearing respectively improve the rotation stability of the left worm and the right worm.

The utility model discloses a hollow combination training apparatus, still include third left pivot 18 and third right pivot, left installation cavity inside top lateral wall is provided with left mounting groove, left mounting groove department is provided with fourth left ball bearing 19, 18 tops of third left pivot are connected with fourth left ball bearing 19 key-type, 18 bottoms of third left pivot are connected with left threaded rod 9 tops, right installation cavity inside top lateral wall is provided with right mounting groove, right mounting groove department is provided with fourth right ball bearing, third right pivot top is connected with fourth right ball bearing key-type, third right pivot bottom is connected with right threaded rod top; the third left rotating shaft and the fourth left ball bearing improve the rotation stability of the left threaded rod, and the third right rotating shaft and the fourth right ball bearing improve the rotation stability of the right threaded rod.

The utility model discloses a hollow combined training apparatus, which also comprises four groups of first left nuts 20 and four groups of first right nuts, wherein the four groups of first left nuts 20 are respectively screwed on the four groups of left bolts 3, and the four groups of first right nuts are respectively screwed on the four groups of right bolts; the four groups of first left nuts are respectively screwed on the four groups of left bolts, and the four groups of first right nuts are respectively screwed on the four groups of right bolts, so that the fixing effect of the cross rod is improved.

The hollow combined training instrument of the utility model also comprises a second left nut 21 and a second right nut, wherein the outer side wall parts of the second left rotating shaft 6 and the second right rotating shaft are respectively provided with an external thread, and the second left nut 21 and the second right nut are respectively screwed on the second left rotating shaft 6 and the second right rotating shaft; after the height of the cross rod is fixed, the second left nut and the second right nut are screwed, and the possibility that the height of the left lifting block and the height of the right lifting block are changed is reduced.

In the hollow combined training instrument of the utility model, the left dead lever 10 and the right dead lever are both cylindrical; the left fixed rod and the right fixed rod are both cylindrical, and friction is reduced.

The utility model relates to a hollow combined training apparatus, the outer side walls of the left turntable 14 and the right turntable are both provided with anti-skid bulges 22; all be provided with the non-slip raised on left side dish and the right side dish lateral wall, increase the frictional force with the hand.

The utility model relates to a hollow combined training apparatus, the top side wall of a left connecting rod 4 is communicated with a left oil injection port 23, and the top side wall of a right connecting rod is communicated with a right oil injection port; lubricating oil is added into the left mounting cavity and the right mounting cavity respectively through the left oil filling port and the right oil filling port at regular intervals, and friction force is reduced.

The utility model discloses a cavity combination training apparatus, left side base and right base are all fixed subaerial, install the chamber and regularly add lubricating oil in the right installation chamber respectively left through left side oiling mouth and right side oiling mouth, reduce frictional force, all be provided with non-slip raised on left side carousel and the right carousel lateral wall, increase the frictional force with the hand, rotatory left turn dish, under the mutually supporting of third left ball bearing, second left pivot and second left ball bearing, the left worm is rotatable, at third left pivot, fourth left ball bearing, first left ball bearing, under the mutually supporting of first left pivot and left worm wheel, left turn dish rotates and makes left threaded rod rotate, because left threaded rod spiral shell dress passes left elevator, and can not rotate under the mutually supporting of left dead lever, thereby left turn dish rotates and makes the high emergence change of left elevator, rotatory right turn dish, at third right ball bearing, the left side oiling mouth is opened with right side oiling mouth and is opened the right side installation chamber is opened, the left, Under the mutual matching of the second right rotating shaft and the second right ball bearing, the right worm can rotate, under the mutual matching of the third right rotating shaft, the fourth right ball bearing, the first right rotating shaft and the right worm wheel, the right rotating disc rotates to enable the right threaded rod to rotate, as the right threaded rod is threaded through the right lifting block and cannot rotate under the mutual matching of the right fixing rod, the right rotating disc rotates to enable the height of the right lifting block to change, the left fixing rod and the right fixing rod are cylindrical, the friction force is reduced, the heights of the left lifting block and the right lifting block are adjusted according to the height of a user, after the heights are adjusted to be consistent, the four groups of left bolts penetrate through the left fixing ring and the right fixing ring, the four groups of right bolts penetrate through the right fixing ring and the right fixing ring, the four groups of first left nuts are respectively threaded onto the four groups of left bolts, the four groups of first right nuts are respectively threaded onto the four groups, with horizontal pole rigidity, the horizontal pole highly fixed back, screw second left nut and second right nut, reduce the possibility that left elevator and right elevator take place altitude variation, then the user both hands are held the horizontal pole, accomplish the chin and move, and the horizontal pole highest height is by the high decision of left connecting rod and right connecting rod, and applicable in adult or children use, with horizontal pole position adjustment to best to reach best training state.

The utility model discloses a cavity combination training apparatus, it is above the mounting means of all parts, connected mode or the mode that sets up are the welding, riveting or other common mechanical system, wherein can slide/rotate fixedly promptly for slide/not dropping under the rotation state, seal the intercommunication and seal when two connecting pieces communicate promptly, and the concrete structure of its all parts, model and coefficient index are its from the area technique, as long as can reach all implementation of its beneficial effect, above-mentioned all with the electric module and be the common electrical part in market with electrical apparatus, buy when returning to the use only need connect according to the mutual electricity of the instruction manual of buying back together and can use, and control module is its common from taking the module, the event is all no longer repeated here.

The hollow combined training apparatus of the utility model, without the contrary explanation, the directional words included in the terms such as "up, down, left, right, front, back, inside and outside, vertical and horizontal" only represent the direction of the term in the normal use state, or be a trivial term understood by those skilled in the art, and should not be considered as limiting the term, at the same time, the numerical terms "first," "second," and "third," etc. do not denote any particular quantity or order, but rather are used to distinguish one from another, furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (8)

1. A hollow combined training apparatus comprises a left base (1), a right base and a cross bar (2); the device is characterized by further comprising a left supporting mechanism, a right supporting mechanism, a left bolt (3) and a right bolt, wherein the bottom ends of the left supporting mechanism and the right supporting mechanism are respectively arranged on a left base (1) and a right base, the left supporting mechanism comprises a left connecting rod (4), a first left rotating shaft (5), a second left rotating shaft (6), a left worm wheel (7), a left worm (8), a left threaded rod (9), a left fixing rod (10) and a left lifting block (11), the bottom end of the left connecting rod (4) is connected with the left base (1), a left mounting cavity is arranged inside the left connecting rod (4), a left transition port is communicated with the right side wall of the left connecting rod (4), the left lifting block (11) is provided with a left threaded hole and a left limiting hole, a left placing groove is arranged on the bottom side wall in the left mounting cavity, a first left ball bearing (12) is arranged at the position of the left placing groove, the bottom end of the first left rotating shaft (5) is connected with the, the left fixing rod (10) penetrates through a left limiting hole, the top end and the bottom end of the left fixing rod (10) are connected with the inner top side wall and the inner bottom side wall of a left mounting cavity respectively, the bottom end of a left threaded rod (9) penetrates through a left threaded hole and then is connected with the top end of a first left rotating shaft (5), the first left rotating shaft (5) is in key connection with a left worm wheel (7), a left mounting opening is formed in the front side wall of a left connecting rod (4) in a communicated mode, a second left ball bearing (13) is arranged at the position of the left mounting opening, the second left rotating shaft (6) is in key connection with the second left ball bearing (13), the second left rotating shaft (6) is in key connection with a left worm (8), the left worm (8) is meshed with the left worm wheel (7), a left rotating disc (14) is arranged at the front end of the second left rotating shaft (6), and a right supporting mechanism comprises a right connecting rod, The right connecting rod bottom end is connected with a right base, a right mounting cavity is arranged in the right connecting rod, a right transition port is arranged on the left side wall of the right connecting rod in a communicating manner, the right lifting block is provided with a right threaded hole and a right limiting hole, a right placing groove is arranged on the inner bottom side wall of the right mounting cavity, a first right ball bearing is arranged at the right placing groove, the bottom end of a first right rotating shaft is connected with the first right ball bearing key, the right fixing rod penetrates through the right limiting hole, the top end and the bottom end of the right fixing rod are respectively connected with the right mounting cavity inner top side wall and the inner bottom side wall, the right threaded rod bottom end is screwed through the right threaded hole and then connected with the top end of the first right rotating shaft, the first right rotating shaft is connected with a right worm wheel key, the right connecting rod front side wall is provided with a right mounting port in a communicating manner, a second right ball bearing is arranged at the right mounting port, and second right pivot and right worm key-type connection, right worm and right worm wheel meshing, second right pivot front end are provided with right side carousel, and left elevator (11) right-hand member and right elevator left end are provided with solid fixed ring in a left side (15) and the solid fixed ring in the right side respectively, and the solid fixed ring in a left side (15) and the solid fixed ring in the right side edge zone are provided with four left fixed orifices of group and four right fixed orifices of group respectively, horizontal pole (2) left end and right-hand member are provided with left mounting ring (16) and right mounting ring respectively, and left mounting ring (16) and right mounting ring edge zone are provided with the right mounting hole of the left mounting hole multiunit of multiunit respectively, every group left bolt (3) all pass a set of left side fixed orifices and a set of left side mounting hole, every group right side bolt all passes a set of right side fixed.

2. A hollow combined training device as claimed in claim 1, wherein the rear wall of the left connecting rod (4) is connected with a left fixing port, a third left ball bearing (17) is arranged at the left fixing port, the rear end of the second left rotating shaft (6) is connected with the third left ball bearing (17) in a key mode, the rear wall of the right connecting rod is connected with a right fixing port, a third right ball bearing is arranged at the right fixing port, and the rear end of the second right rotating shaft is connected with the third right ball bearing in a key mode.

3. The hollow combination training device as claimed in claim 2, further comprising a third left rotating shaft (18) and a third right rotating shaft, wherein the top wall of the left mounting cavity is provided with a left mounting groove, a fourth left ball bearing (19) is arranged at the left mounting groove, the top end of the third left rotating shaft (18) is in key connection with the fourth left ball bearing (19), the bottom end of the third left rotating shaft (18) is connected with the top end of the left threaded rod (9), the top wall of the right mounting cavity is provided with a right mounting groove, the right mounting groove is provided with a fourth right ball bearing, the top end of the third right rotating shaft is in key connection with the fourth right ball bearing, and the bottom end of the third right rotating shaft is connected with the top end of the right threaded rod.

4. A hollow combination training device as claimed in claim 3 further comprising four sets of first left nuts (20) and four sets of first right nuts, said four sets of first left nuts (20) being threaded onto four sets of left bolts (3) respectively and said four sets of first right nuts being threaded onto four sets of right bolts respectively.

5. A hollow combination training device as claimed in claim 4, further comprising a second left nut (21) and a second right nut, wherein the outer side wall portion of the second left rotating shaft (6) and the outer side wall portion of the second right rotating shaft are provided with external threads, and the second left nut (21) and the second right nut are respectively screwed on the second left rotating shaft (6) and the second right rotating shaft.

6. A hollow combination exercise device as claimed in claim 5, wherein the left securing rod (10) and the right securing rod are both cylindrical.

7. A hollow combination exercise device according to claim 6, wherein the left and right discs (14, 14) are provided with anti-slip projections (22) on the outer side walls.

8. A hollow combination exercise device according to claim 7, wherein the top side wall of the left connecting rod (4) is provided with a left grease inlet (23) and the top side wall of the right connecting rod is provided with a right grease inlet.

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