Safety device for pneumatic nailers

Details Safety device for pneumatic nailers Safety device for pneumatic nailers

2002-01-25

2002-08-06

Smith, Scott A. (Department: 3721)

Elongated-member-driving apparatus

With means to support member and/or work relative to driver

With means to vary the length of the tool stroke

C227S008000

Reexamination Certificate

active

06427896

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a safety device that is easily assembled and requires less number of parts.
BACKGROUND OF THE INVENTION
A conventional safety device for pneumatic nailers is shown in
FIGS. 1 and 2
and generally includes a push rod
10
having a threaded end
101
which is threadedly connected with a threaded hole
121
in an adjusting member
12
. The adjusting member
12
is rotatably mounted to a pivotal member
13
which has a threaded rod
133
which extends through a hole
111
of a connection plate
111
and is connected with a nut
16
. The connection plate
11
is connected to the trigger of the pneumatic nailer and the push rod
10
is movably connected to a nose portion of the nailer so that the trigger cannot be pulled if the push rod
10
is not pushed backward to move the connection plate
11
. The threaded rod
133
has two surfaces
134
(only one is shown) so that when connecting with the nut
16
, a wrench is used to hold at the surfaces
134
to prevent the pivotal member
13
from rotating with the nut
16
. This takes time and requires a wrench to complete the engagement. The adjusting member
12
has two grooves
122
and
123
which respectively receive two C-shaped clamps
14
,
15
therein. Two legs of the clamp
14
extend through the groove
122
and contact the notches
131
in the pivotal member
13
. Two legs of the clamp
15
extend through the groove
123
and contact the notches
132
in the pivotal member
13
. By the two clamps
14
,
15
, the adjusting member
12
can be rotated on the pivotal member
13
and positioned relative to the pivotal member
13
. The two clamps
14
,
15
both are connected to the adjusting member
12
so that the adjusting member
12
needs to be machined to have many grooves and holes. In some situations, there are only two threads connection between the threaded end
101
and the threaded hole
121
, the huge vibration when operating the pneumatic nailer could separate the push rod and the adjusting member
12
.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a safety device for pneumatic nailers and the device comprises a push rod having a connection end which has a threaded section and a distal section. An adjusting member has a threaded hole defined through a first end of the adjusting member so that the threaded section is connected therewith. A recess is defined a second end of the adjusting member so as to receive a first end of a pivotal member. A first groove is defined in an outside of the second end of the adjusting member and two apertures communicate with the first groove and are defined through the adjusting member. A threaded rod extends from a second end of the pivotal member and a second groove is defined in an outer periphery of the first end of the pivotal member. Two notches communicate with the second groove and are defined through the pivotal member. A clamp is received in the first groove and two legs of the clamp extend through the apertures and are engaged with the notches. A passage is defined through the pivotal member so that the distal section extends through the threaded hole and the passage. Two plain surfaces are defined in a root portion of the threaded rod. A connection plate has a hole which has two straight insides and the threaded rod extends through the hole. The two plain surfaces of the threaded rod are engaged with the two straight insides of the hole and a nut is engaged with the threaded rod.
The primary object of the present invention is to provide a safety device for a pneumatic nailer wherein the connection of the nut and the threaded rod of the pivotal member needs no additional wrench.
Another object of the present invention is to provide a safety device for a pneumatic nailer wherein the connection end of the push rod extends in the pivotal member so that the push rod is- prevented from being disengaged from the adjusting member.
The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.


REFERENCES:
patent: 5219110 (1993-06-01), Mukoyama
patent: 5385286 (1995-01-01), Johnson, Jr.
patent: 5579977 (1996-12-01), Yang
patent: 6012622 (2000-01-01), Weinger et al.
patent: 6024267 (2000-02-01), Chen
patent: 6170729 (2001-01-01), Lin

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