Self Locking device for power tool

Chucks or sockets – Socket type – Obliquely guided reciprocating jaws

Reexamination Certificate

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Details

C279S140000, C279S902000

Reexamination Certificate

active

06257596

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 rod for securing to and for being driven by the power tool, the rod including three or more channels for slidably receiving three or more pawls to engage with a tool member, the pawls each including a threaded surface, a barrel including an inner thread threaded with the threaded surfaces of the pawls, a follower slidably secured to the barrel and rotated in concert with the barrel, the follower including one or more teeth, a striker including one or more teeth for engaging with the teeth of the follower, and means for biasing the teeth of the striker to engage with the teeth of the follower.
A housing includes one or more channels for slidably receiving one or more keys of the striker and for slidably securing the striker to the housing and for allowing the striker to be rotated in concert with the housing. The housing includes a cap, the biasing means includes a spring engaged between the cap and the striker for biasing the teeth of the striker to engage with the teeth of the follower.
A casing is further secured to the rod, the housing includes an aperture formed therein, the casing includes an engaging hole formed therein for engaging with a driving tool and for allowing the casing to be rotated relative to the housing. A spacer is further disposed between the casing and the barrel.
The rod includes three or more channels formed therein and includes a peripheral swelling extended radially outward therefrom and having three or more inclined orifices formed therein and aligned with the channels of the rod for slidably receiving the pawls.


REFERENCES:
patent: 4951955 (1990-08-01), Sakamaki
patent: 5988653 (1999-11-01), Kuo
patent: 5992859 (1999-11-01), Lin

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