1. Field of Invention
The present invention relates to a chuck and, more particularly, to a convenient and reliable chuck.
2. Related Prior Art
Referring to
As disclosed in U.S. Pat. No. 6,325,393, another conventional chuck includes a spring-loaded follower located in the hexagonal pocket and abutted against the bit when the sleeve is in the locking position. When the sleeve is in the releasing position with one hand, the spring-loaded follower can push the bit out of the hexagonal pocket. The bit could however be ejected out of the hexagonal pocket by the spring-loaded follower and be lost.
The present invention is therefore intended to obviate or at least alleviate the problems encountered in prior art.
It is an objective of the present invention to provide a convenient chuck.
It is another objective of the present invention to provide a reliable chuck.
To achieve the foregoing objectives, the chuck includes a rod, a ball, two spring-loaded pushers, and a spring-loaded sleeve. The rod includes a hexagonal pocket axially defined therein, a circular pocket axially defined therein so that it is in communication with the hexagonal pocket, and an aperture transversely defined therein so that it is in communication with the hexagonal pocket. The ball is movably located in the aperture so that the ball can be partially inserted in the hexagonal pocket. The first spring-loaded pusher is movably located in the circular pocket for pushing a bit. The spring-loaded sleeve is movably located on the rod for pushing the ball in a direction. The second spring-loaded pusher is movably located between the rod and the sleeve for pushing the ball in an opposite direction.
The chuck may further include a first spring for biasing the first pusher. The first pusher may include a tunnel defined therein for receiving a portion of the spring. The chuck may further include a magnet attached to the spring for attracting the bit.
The chuck may further including a second spring for biasing the second pusher. The chuck may further include a ring fit in the sleeve so that the second spring is compressed between the ring and the second pusher.
The sleeve may include an annular rib formed on an internal side thereof for retaining the second pusher therein and for keeping the ball in the aperture. The chuck may further include a washer secured to the rod and a spring compressed between the annular rib and a washer. The chuck may further include a C-clip secured to the rod for abutment against the washer.
Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.
The present invention will be described via detailed illustration of two embodiments versus the prior art referring to the drawings wherein:
Referring to
Each of the apertures 14 includes a small open end located near the hexagonal pocket 12 and an opposite large open end. The diameter of the balls 20 is smaller than the width of the large open ends of the apertures 14 while the diameter of the balls 20 is larger than the width of the small open ends of the apertures 14 so that each of the balls 20 can be moved into a related one of the apertures 14 through the large open end but cannot be completely moved out of the same through the small open end. Each of the balls 20 can however be partially moved out of a related one of the apertures 14 through the small open end.
The pusher 30 is a tubular element with a tunnel 33 axially defined therein. A magnet 34 is fit in an open end of the tunnel 33. The pusher 30 includes an annular shoulder formed on an internal side thereof so that the pusher 30 is divided into two sections on the external side thereof.
The sleeve 40 includes an annular rib 44 formed on the internal side thereof. The space defined in the sleeve 40 is divided into two portions by the annular rib 44.
In assembly, an end of the spring 32 is located in the tunnel 33 while another end of the spring 32 is located outside the tunnel 33. The spring 32 and the first section of the pusher 30 are located in the circular pocket 13. The second section of the pusher 30 is located in the hexagonal pocket 12. A C-ring 31 is located on the second section of the pusher 30. The C-ring 31 is located between the annular shoulder of the pusher 30 and the annular rib of the rod 10 so that the pusher 30 is retained in the hexagonal pocket 12 and the circular pocket 13. The spring 32 is compressed between the magnet 34 and a closed end of the circular pocket 13.
The balls 20 are located in the apertures 14. The pusher 50 is movably located in the sleeve 40. The second spring 51 is located in the sleeve 40. The ring 52 is fit in the sleeve 40 so that there is not movement of the ring 52 relative to the sleeve 40. The second spring 51 is compressed between the second pusher 50 and the ring 52. The sleeve 40 is movably located on the end 11 of the rod 10 between a locking position and a releasing position. The third spring 43 and a washer 42 are located between the end 11 of the rod 10 and the sleeve 40 in a radial direction of the rod 10. A C-clip 41 is fit in an annular groove defined in an external side of the end 11 of the rod 10 so that the ring 52, the second spring 51, the pusher 50, the third spring 43, the washer 42 and the sleeve 40 are retained on the end 11 of the rod 10. The annular rib 44 is located between the pusher 50 and the third spring 43 in an axial direction of the rod 10.
Referring to
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The chuck 100 exhibits at least two advantages. At first, it is convenient since the first spring 32 automatically pushes the bit 60 against the second spring 51. Secondly, it is reliable since hexagonal pocket 12 because the magnet 34 attracts the bit 60 and hence prevents loss of the bit 60.
Referring to
Referring to
The present invention has been described via the detailed illustration of the embodiments. Those skilled in the art can derive variations from the embodiments without departing from the scope of the present invention. Therefore, the embodiments shall not limit the scope of the present invention defined in the claims.