Socket spanner provided with retaining device

Details Socket spanner provided with retaining device Socket spanner provided with retaining device

1998-07-25

2001-01-30

Scherbel, David A. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Rigid jaws

Reexamination Certificate

active

06178854

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to a socket spanner, a socket spanner provided with a nut retaining device.
BACKGROUND OF THE INVENTION
As shown in FIG.
1
,the U.S. pat. application Ser. No.08/672,859 filed by this inventor as the same as the present invention discloses a socket
20
having a driven end
22
which is provided in the inner wall thereof with two grooves
221
diagonally opposing each other. The driven end
22
is further provided in proximity of one end thereof with a circular slot
222
.An elastic body
24
is fitted into the fitting end
22
of the socket
20
such that a retaining side
241
of the elastic body
24
is retained in the grooves
221
of the fitting end
22
,and that a curved end portion
244
of the elastic body
24
urges against the circular slot
222
of the driven end
22
. As a result, a protruded edge
242
of the retaining side
241
of the elastic body
24
is capable of retaining a nut which is engaged with the driven end
22
of the socket
20
.In the meantime, the retaining side
241
is capable of preventing the elastic body
24
from slipping out of the socket
20
at the time when the nut is taken out of the socket
20
. The elastic body
24
is further provided with a bottom portion
243
having an arcuate configuration.
As shown in
FIG.2
, the U.S. pat. application Ser. No.08/998,686 filed by this inventor of the present invention discloses a socket spanner with a nut retaining device which is intended to overcome the structural deficiency of the socket spanner disclosed in the afore-mentioned U.S. pat. application Ser. No.08/672,859 and is composed of a circular slot
222
located in the bottom of the driven end of the socket. The elastic body is thus fitted into the driven end such that the arcuate bottom portion
243
of the elastic body is retained in the circular slot
222
so as to facilitate the removing of the nut which is engaged with the fitting end of the socket.
The socket spanners disclosed in the U.S. pat. application Ser. Nos.08/672,859 and 08/998,686 share a common structural deficiency in that they are provided with a circular slot
222
which can not be easily lathed with precision.
SUMMARY OF THE INVENTION
The primary objective of the present invention is therefore to provide a socket spanner with a nut retaining device free from the shortcomings of the prior art devices described above.
In keeping with the principle of the present invention, the foregoing objective of the present invention is attained by a socket spanner provided with a socket having a driven end which is provided in the inner wall thereof with two diagonally opposing each other. The driven end is further provided with an elastic body fitted securely thereinto such that two retaining sides of the elastic body are securely retained in the two retaining grooves of the driven end of the socket.


REFERENCES:
patent: 3665791 (1972-05-01), Carr
patent: 3834253 (1974-09-01), Carr
patent: 4787278 (1988-11-01), Bononi

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