ROTARY DUMBBELL
A rotary dumbbell of the present invention includes a handle, and two pairs of wheels and weight devices pivoted on opposite ends of the handle for rotation. Each of the wheels has a center pivoted on the handle and is unadjustable in a radial direction thereof that the wheels centrally rotate. Each of the weight devices is adjustable in a radial direction thereof that the weight devices may eccentrically rotate. The dumbbell further includes two pairs of covers to hold the weight devices and the wheels respectively. Therefore, user may get an extra loading because of the eccentric rotation of the weight devices when he/she shakes the dumbbell. The dumbbell may be used as a roller to train abdominal muscles while the wheels serve the function of rollers.
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1. Field of the Invention
The present invention relates generally to a training apparatus, and more particularly to a rotary dumbbell.
2. Description of the Related Art
Recently, physical fitness has already become one of the common leisure activities. People usually go to gym to exercise because some huge and expensive fitness apparatuses are equipped in the gym only. However, not every person has the time and the money to spend at a gym, so that people buy some simple and inexpensive fitness apparatuses for use at home.
Dumbbell is one of the most popular fitness apparatus to provide a wide variety of exercises such as biceps curls, triceps extensions, and the like. Dumbbells are commonly found in gyms, as well as for sale to private users because they are small, simple and cheap for ordinary people to exercise.
Typically, the conventional dumbbell usually has two weight-heads attached to opposite ends of a handle bar. A full set of such dumbbells includes various pairs of dumbbells with different weights that user may choose the specific dumbbells according to his/her particular physical condition and exercise needs.
Taiwan utility patent no. M385377 taught an improved dumbbell, which has a handle tube, an axle inserted into the handle tube, two bearings fixed in the handle tube to support the axle that the axle may rotate freely, and two weight devices fixed to opposite ends of the axle. The weight devices will rotate when user holds the handle tube and shakes the dumbbell. The most important thing is that the weight devices are eccentric that the eccentric rotation of the weight devices will provide an extra loading when user shakes the dumbbell. However, this eccentric dumbbell always provides eccentric rotation. The eccentric rotation of the weight devices of the dumbbell is uncontrollable and may hurt user when the user takes the eccentric dumbbell as the ordinary dumbbell to exercise.
SUMMARY OF THE INVENTIONThe primary objective of the present invention is to provide a rotary dumbbell, which is adjustable to have different eccentric loadings.
The secondary objective of the present invention is to provide a rotary dumbbell, which has another function to exercise except for the normal training mode of dumbbell.
To meet the objectives, a rotary dumbbell of the present invention includes a handle and two pairs of wheels and weight devices pivoted on opposite ends of the handle for rotation. Each of the wheels has a center pivoted on the handle and is unadjustable in a radial direction thereof that the wheels centrally rotate. Each of the weight devices is adjustable in a radial direction thereof that the weight devices may rotate eccentrically.
Therefore, user may get an extra loading because of the eccentric rotation of the weight devices when he/she shakes the dumbbell. The dumbbell may be used as roller also to train abdominal muscles while the wheels serve the function of rollers.
As shown in
As shown in
Two pairs of first covers 20 and second covers 50 are respectively fitted to the opposite ends of the axle 12 in sequence. Between each pair of the first cover 20 and the second cover 50, the wheel 30 and the weight device 40 are provided. The first cover 20 has a cavity 21 at a center of an outer side and a hole 22 at a bottom of the cavity 21. The first cover 20 further has three posts 23 projected from an inner side thereof with plural of ribs 24 at bottoms respectively. The axle 12 passes through the hole 22 of the first cover 20, and an end of the handle 10 is received in the cavity 21. A C-ring 13 engages the axle 12 at the inner side of the first cover 20 that the first cover is coupled to the axle 12. The second cover 50 is a disc-like member, and has a cavity 51 at a center thereof and a hole at a bottom of the cavity 51.
As shown in
It is noted that the weight members 31 are divided into three stacks, and the connecting hole 361 of the case 30 is located at a center of gravity of the weight members 31. That is, the wheels 30 will centrally rotate.
As shown in
The weight device 40 is able to be moved in a radial direction when the fastener 52 is loosed, and the fastener 52 should be fastened again to fix the weight device 40. When the weight device 40 is moved to a central position, where the connecting portion 14 of the axle 12 is located at the central end of the adjusting slot 47, the weight device 40 will rotate centrally. When the weight device 40 is moved in the radial direction to have the connecting portion 14 of the axle 12 off the central end, the weight device 40 will rotate eccentrically. When the connecting portion 14 of the axle 12 reaches the eccentric end of the adjusting slot 47, as shown in
As shown in
The description above is a few preferred embodiments of the present invention and the equivalence of the present invention is still in the scope of claim construction of the present invention.
Claims
1. A rotary dumbbell, comprising:
- a handle;
- two wheels pivoted on opposite ends of the handle for free rotation; and
- two weight devices pivoted on the opposite ends of the handle for free rotation;
- wherein each of the wheels has a center pivoted on the handle and is unadjustable in a radial direction thereof to have a central rotation;
- wherein each of the weight devices is adjustable in a radial direction thereof to have an eccentric rotation.
2. The rotary dumbbell as defined in claim 1, further comprising an axle pivoted on the handle for free rotation, wherein the axle has two connecting portions at opposite ends, and the connecting portions extend out of the opposite ends of the handle to connect the wheels and the weight devices respectively.
3. The rotary dumbbell as defined in claim 2, wherein the weight device has an elongated adjusting slot extending in the radial direction, and the axle passes through the adjusting slot of the weight device that the weight device is moved along the adjusting slot.
4. The rotary dumbbell as defined in claim 1, further comprising two pairs of first covers and second covers, between each pair of which the wheel and the weight device are provided.
5. The rotary dumbbell as defined in claim 4, wherein the first cover has a plurality of posts to be inserted into holes on the wheel that the first cover rotates along with the wheel.
6. The rotary dumbbell as defined in claim 4, wherein the first cover has a cavity to receive the end of the handle therein.
7. The rotary dumbbell as defined in claim 4, wherein the second cover has a cavity with a hole at a bottom thereof, and a fastener is inserted into the hole of the second cover to be connected to the handle.
8. The rotary dumbbell as defined in claim 1, wherein the wheel has a case and at least a weight member received in the case, and the weight member is evenly distributed in the case.
9. The rotary dumbbell as defined in claim 8, wherein the case has a box and a lid, and the box has posts to be inserted into holes of the weight member when the weight member is put in the box, and the lid covers the box with screws screwed into the posts of the box through the lid.
10. The rotary dumbbell as defined in claim 1, wherein the weight device has a case and at least a weight member received in the case, and the weight member is unevenly distributed in the case.
11. The rotary dumbbell as defined in claim 10, wherein the case has a region without the weight member, and an elongated adjusting slot is provided on the region.
12. The rotary dumbbell as defined in claim 11, wherein the adjusting slot extends in the radial direction with an end at a center of the case.
13. The rotary dumbbell as defined in claim 11, wherein the adjusting slot extends in the radial direction with an end distal to a center of gravity of the weight member.
14. The rotary dumbbell as defined in claim 1, wherein the wheel has a diameter the same as that of the weight device.
15. A rotary dumbbell, comprising:
- a handle; and
- two weight devices pivoted on opposite ends of the handle for free rotation;
- wherein each of the weight devices has a case and at least a weight member received in the case, and the weight member is unevenly distributed in the case.
16. The rotary dumbbell as defined in claim 15, wherein the case has a region without the weight member, and an elongated adjusting slot is provided on the region and extends in a radial direction, and the handle has an connecting portion engaged with the adjusting slot that the weight device is adjustable in the adjusting slot.
17. The rotary dumbbell as defined in claim 16, wherein the adjusting slot has an end at a center of the case.
18. The rotary dumbbell as defined in claim 16, wherein the adjusting slot has an end distal to a center of gravity of the weight member.
19. The rotary dumbbell as defined in claim 15, further comprising a pair of wheels pivoted on the opposite end of the handle, and the wheels and the weight devices have the same rotation axis.
Type: Application
Filed: Jun 22, 2011
Publication Date: Sep 6, 2012
Applicant: SPORTS-ACE INTERNATIONAL CO., LTD. (Taichung)
Inventor: Anthony Shaw (Taichung)
Application Number: 13/166,515
International Classification: A63B 21/22 (20060101);