Chucks or sockets – Socket type – Obliquely guided reciprocating jaws
Reexamination Certificate
1999-08-11
2001-02-06
Bishop, Steven C. (Department: 3722)
Chucks or sockets
Socket type
Obliquely guided reciprocating jaws
C279S902000, C408S240000
Reexamination Certificate
active
06182978
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a locking device, and more particularly to a self locking device for a power tool.
2. Description of the Prior Art
Typical power tools comprise a chuck for securing the tool members, such as the screw driver bits, the drill gimlets, or the wrench tools. The power tools include a control ferrule that is required to be rotated to secure the tool members to the power tool manually. In addition, an additional locking tool is required to further solidly secure the tool members to the power tool.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional locking devices for power tools.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a power tool having a self locking device for locking the tool member to the power tool.
In accordance with one aspect of the invention, there is provided a self locking device for a power tool comprising a body for securing to and for being driven by the power tool, the body including a bore formed therein for receiving a tool member to be driven by the power tool and including at least three channels formed therein and communicating with the bore thereof, at least three pawls slidably engaged in the channels of the body for engaging with the tool member, the pawls each including a threaded surface formed therein, a barrel including an inner thread formed therein and threading with the threaded surfaces of the pawls, the barrel including a first end having at least one tooth extended therefrom, a ferrule rotatably engaged on the barrel and including at least one tooth extended therefrom for engaging with the tooth of the barrel and for securing the barrel to the ferrule, and means for biasing the ferrule away from the first end of the barrel to disengage the tooth of the ferrule from the tooth of the barrel. The pawls are rotated relative to the barrel to engage with the tool member when the barrel is secured to the ferrule.
The ferrule includes an annular shoulder formed therein and having the tooth extended downward from the annular shoulder thereof, the tooth of the barrel is extended upward from the first end of the barrel to engage with the tooth of the ferrule when the ferrule is forced toward the first end of the barrel against the biasing means.
A securing device is further provided for rotatably securing the ferrule to the barrel. The body includes an annular recess formed therein, the barrel includes at least one aperture formed therein, the rotatably securing device includes at least one ball received in the aperture of the barrel, and a sleeve engaged on the barrel and engaged with the ball for forcing the ball inward the annular recess of the body and for rotatably securing the barrel to the body, the sleeve is engaged with the ferrule for preventing the ferrule from being disengaged from the barrel.
A cover is further rotatably secured onto the body for shielding the pawls. The barrel includes an engaging hole formed therein for engaging with and for driving a fastener. The barrel includes at least one slot formed therein for engaging with a driving tool. The ferrule includes an annular flange extended radially inward therefrom for rotatably engaging with the barrel.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.
REFERENCES:
patent: 3807745 (1974-04-01), Bent
patent: 4381116 (1983-04-01), Futter
patent: 4840387 (1989-06-01), McCarthy
patent: 4951955 (1990-08-01), Sakamaki
patent: 5615899 (1997-04-01), Sakamaki
patent: 5988653 (1999-11-01), Kuo
patent: 5992859 (1999-11-01), Lin
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