Weight-adjustable dumbbell
A weight-adjustable dumbbell includes a dumbbell base, which has a plurality of locating holes, a plurality of weights, which are detachably mountable on the dumbbell base, each having a plurality of through holes corresponding to the locating holes of the dumbbell bases, and a plurality of lock pins insertable into the locating holes of the dumbbell base and the through holes of the weights to selectively secure the weights to the dumbbell base.
1. Field of the Invention
The present invention relates to a dumbbell and more particularly, to a weight-adjustable dumbbell.
2. Description of the Related Art
When making a body building exercise, a dumbbell is commonly used to train the muscles. There are dumbbells that allow the user to adjust the total weight. A weight-adjustable dumbbell generally comprises a bar, a plurality of weights selectively detachably mounted on the ends of the bar, and two screw caps respectively threaded onto the ends of the bar to lock the loaded weights. When adjusting the total weight of the dumbbell, the user must detach the screw caps from the bar, and then remove some of the weights from the bar or attach new weights to the bar, and then fasten the screw caps to the bar again after loading of the selected weights. This adjusting procedure is complicated. Further, if the end caps are not fastened tight or the weights are not evenly arranged on the two ends of the bar, the user may be unable to keep the dumbbell in balance when lifting the dumbbell, thereby causing an accident.
SUMMARY OF THE INVENTIONThe present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a dumbbell, which allows the user to adjust the total weight of the dumbbell conveniently.
To achieve the above-mentioned object, the weight-adjustable dumbbell provided by the present invention comprises a dumbbell base having at least one locating hole; a plurality of weights detachably mountable on the dumbbell base, the weights each having at least one through hole corresponding to the at least one locating hole of the dumbbell base; and at least one lock pin insertable into the at least one locating hole of the dumbbell base and insertable into the at least one through hole of the weights to selectively secure the weights to the dumbbell base.
BRIEF DESCRIPTION OF THE DRAWINGS
Referring to
Referring to
The weights 21-29 are heavy plates each having a weight about 2.5 lbs. The weights 21-29 each have a slot 31-38, and a substantially inverted U-shaped mounting flange 4148 adjacent to the slot 31-38. The substantially inverted U-shaped mounting flange 4148 has two sidewalls 51-58 and a top wall 61-68 connected between the sidewalls 51-58. The weights 21-29 have a different pitch between the sidewalls 51-58 and a different elevation among the top walls 61-68. Further, a connecting rod 39 is connected between the two outer weights 29.
Referring to
The top wall 61-68 of the mounting flange 41-48 has a downwardly extending pointed locating pin 81. The locating pin 81 has a head 82 protruding over the top side of the top wall 61-68. The head 82 has a top recess 83. When the weights 21-29 are set in the dumbbell base 11 at two sides, the heads 82 of the locating pins 81 at the top walls 61 are respectively received in respective open chamber 18 in the holder portions 13; the bottom ends of the locating pins 81 at the top walls 61 are respectively received in the recesses 83 of the locating pins 81 at the top walls 62; the bottom ends of the locating pins 81 at the top walls 62 are respectively received in the recesses 83 of the locating pins 81 at the top walls 63; the bottom ends of the locating pins 81 at the top walls 63-67 are respectively received in the recesses 83 of the locating pins 81 at the top walls 64-68; the; the bottom ends of the locating pins 81 at the top walls 68 are respectively received in respective holes 84 at the connecting rod 39. Therefore, the weights 21-29 are secured together by means of the locating pins 81.
As shown in
As shown in
The round shank 93 of each of the lock pins 91 can be respectively inserted through the locating holes 16 of the dumbbell base 11 and the through holes 71-79 of the weights 21-29, keeping the head 94 of each of the lock pins 91 respectively received in the recess 14 at the front side of the holder portion 13 at each of the two distal ends of the dumbbell base 11 and the retaining device 95 of each of the lock pins 91 respectively suspending in the recess 14 at the back side of the holder portion 13 at each of the two distal ends of the dumbbell base 11. Therefore, the steel balls 96 of each lock pin 91 are forced outwards by the respective spring member 97 into engagement with the inside wall of the respective recess 14 to lock the weights 21-29 to the dumbbell base 11.
Referring to
Referring to
Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims
1. A dumbbell comprising:
- a dumbbell base having at least one locating hole;
- a plurality of weights detachably mountable on said dumbbell base, said weights each having at least one through hole corresponding to the at least one locating hole of said dumbbell base; and
- at least one lock pin insertable into the at least one locating hole of said dumbbell base and the at least one through hole of said weights to selectively secure said weights to said dumbbell base.
2. The dumbbell as claimed in claim 1, wherein said weights each have a slot and a mounting flange adjacent to the slot, said mounting flange having two sidewalls and a top wall connected between said sidewalls, said sidewalls being provided with the at least one through hole of the respective weight, the mounting flange of one of said weights being overlapped on the mounting flange of another one of said weights to have each through hole of each weight in alignment with one locating hole of said dumbbell base when a number of said weights are attached to said dumbbell base.
3. The dumbbell as claimed in claim 2, wherein said dumbbell base comprises at least one open chamber in communication with said locating holes for receiving the mounting flanges of said weights.
4. The dumbbell as claimed in claim 1, wherein said weights each comprise a locating pin, said locating pin having a recess at one end thereof; wherein the locating pin of one of said weights is positioned in the recess of the locating pin of another one of said weights when a number of said weights are mounted on said dumbbell base.
5. The dumbbell as claimed in claim 1, wherein said dumbbell base comprises a bar and two holder portions respectively provided at two distal ends of said bar; the at least one locating hole of said dumbbell is respectively defined in said holder portions.
6. The dumbbell as claimed in claim 1, further comprising a connecting rod fixedly connected between two of said weights for supporting the others of said weights in said dumbbell base; said dumbbell base comprises at least one groove for accommodating said connecting rod.
7. The dumbbell as claimed in claim 1, wherein said at least one lock pin each comprises a shank, and a retaining device provided at one end of said shank for securing the respective lock pin to said dumbbell base.
8. The dumbbell as claimed in claim 7, wherein said retaining device comprises at least one steel ball movably mounted in the shank of the respective lock pin and a spring member mounted in the shank of the respective lock pin to support said at least one steel ball and to force said at least one steel ball partially out of the periphery of the shank of the respective lock pin.
Type: Application
Filed: Jun 20, 2005
Publication Date: Oct 19, 2006
Inventor: James Chen (Taichung Hsien)
Application Number: 11/155,737
International Classification: A63B 21/072 (20060101); A63B 21/075 (20060101);