Chucks or sockets – Socket type – Self-grasping
Reexamination Certificate
1999-10-01
2001-08-07
Bishop, Steven C. (Department: 3722)
Chucks or sockets
Socket type
Self-grasping
C279S075000, C279S155000, C279S905000
Reexamination Certificate
active
06270085
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a chuck device for tool bits, and more particularly to a chuck device for tool bits that allows a tool bit to be mounted to and removed from the chuck device by a single hand.
2. Description of the Related Art
FIGS. 11 and 12
of the drawings illustrates a conventional chuck device for tool bits of a pneumatic device that includes an outer cover
90
biased by a spring
93
. When a tool bit
94
is inserted into the chuck device, the user has to use one hand to move the outer cover
90
downward (as viewed from
FIG. 11
) to move a ball
92
to a position engaging with an annular recess
95
in the tool bit
94
. Then, the outer cover
90
is released and the spring
93
is returned to retain the ball
92
in place. Nevertheless, when the tool bit
94
and/or the chuck device is subjected to a shock, the ball
92
is apt to be moved into an annular groove
91
of the outer cover
90
under the action of the spring
93
. The tool bit
94
is thus disengaged. The present invention is intended to provide a chuck device that mitigates and/or obviates the above problems.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to provide an improved chuck device for tool bits that allows the tool bit to be mounted to and removed from the chuck device by a single hand.
In accordance with the present invention, a chuck device for a tool bit comprises:
a spindle with a stub formed on an end thereof, a compartment being defined in the stub;
a tube including a first section mounted around the stub of the spindle and a second section, the tube having an outer shoulder formed on an outer periphery thereof, the tube including a longitudinal hole, a transverse countersink being defined in the second section and communicated with the longitudinal hole of the tube;
a sliding sleeve slidably mounted around the tube, the sliding sleeve including an annular groove in an inner periphery thereof and an inner shoulder formed on the inner periphery thereof;
a ball partially received in the transverse countersink;
a first elastic means mounted around the tube and attached between the outer shoulder of the tube and the inner shoulder of the sliding sleeve; and
a second elastic means including a first end received in the stub and a second end in the tube;
whereby when the chuck device is in a condition not receiving a tool bit, the ball is moved out of the longitudinal hole of the tube and partially located in the annular groove of the sliding sleeve under the action of the second elastic means, and the first elastic means is in a compressed status;
whereby when a tool bit having an annular retaining groove is inserted into the longitudinal hole of the tube to a position where the annular retaining groove of the tool bit aligns with the transverse countersink of the tube, the second elastic means is compressed, the second elastic means returns and thus causes the sliding sleeve to slide along a longitudinal direction of the tube, thereby moving the ball inward to partially engage with the annular retaining groove of the tool bit, thereby retaining the tool bit in place; and
whereby when the sliding sleeve is slid along the longitudinal direction of the tube to the position where the annular groove of the sliding sleeve aligns with the transverse countersink of the tube, the second elastic means returns and thus ejects the tool bit in the longitudinal hole of the tube.
A bottom wall that defines the transverse countersink has a hole communicated with the longitudinal hole of the tube, whereby the ball is prevented from completely falling into the tube by the bottom wall yet allowing the ball to partially move into the tube.
In an embodiment of the invention, the second elastic means includes an elastic member and a follower. The follower includes a first section with a receptacle therein and a second section that moves the ball out of the longitudinal hole of the tube. The elastic member includes a first end received in the compartment of the stub and a second end received in the receptacle of the follower for biasing the second section of the follower to a position so as to move the ball out of the longitudinal hole of the tube.
The second section of the tube includes an inner shoulder. The follower includes an outer shoulder that bears against the inner shoulder of the second section of the tube when the second section of the follower is biased by the elastic member to the position for moving the ball out of the longitudinal hole of the tube.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 1119276 (1914-12-01), Griffith et al.
patent: 1516257 (1924-11-01), White
patent: 2135861 (1938-11-01), Thompson
patent: 3788658 (1974-01-01), Benjamin et al.
patent: 4577875 (1986-03-01), Miyakawa
patent: 4692073 (1987-09-01), Martindell
patent: 4850758 (1989-07-01), Morgan
patent: 4900202 (1990-02-01), Wienhold
patent: 5013194 (1991-05-01), Wienhold
patent: 5062749 (1991-11-01), Sheets
patent: 5398946 (1995-03-01), Quiring
patent: 5452906 (1995-09-01), Huff et al.
patent: 5476273 (1995-12-01), Shadeck et al.
patent: 6199872 (2001-03-01), Hasan
patent: 3324756 A1 (1985-01-01), None
Chang-Kao Chiu-Man
Chen Tsai-Ching
Bishop Steven C.
Kamrath Alan
Rider Bennett Egan & Arundel LLP
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