Pneumatic tool structure

Details Pneumatic tool structure Pneumatic tool structure

2001-12-03

2003-05-06

Rada, Rinaldi I. (Department: 3721)

Tool driving or impacting

Miscellaneous

C173S213000, C173S216000, C173S217000, C173S218000, C173S219000

Reexamination Certificate

active

06557649

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention is related to a pneumatic tool structure including a main body integrally having an elbow. The elbow has a top section formed with an opening. The pneumatic motor is placed into the main body through the opening and fixed in the main body. The installation of the pneumatic motor is easy and the test is facilitated.
FIGS. 7
to
9
show a conventional pneumatic tool having a main body
7
. A switch unit
71
and an intake unit
72
are arranged on lower section of the main body
7
. A pneumatic motor
73
is disposed in the upper section of the main body
7
and fixed by a fitting ring
74
. A driving unit
77
is disposed in an elbow
75
and coupled with a bit such as a sand disc. The bottom of the elbow
75
has a coupling section
751
. A retainer ring
76
is screwed on the coupling section
751
and the fitting ring
74
to fix the elbow
75
with the main body
7
.
When assembled, the switch unit
71
and the intake unit
72
are first mounted into the lower section of the main body
7
. Then, the pneumatic motor
73
is installed into the upper section of the main body
7
. Then a test is performed to check the cooperation and operation of the pneumatic motor
73
, switch unit
71
and the intake unit
72
. In case of problem, it is necessary to disassemble the pneumatic motor
73
, switch unit
71
and the intake unit
72
for further test. After passing through the test, the elbow
75
is assembled with the main body
7
by means of the retainer ring
76
screwed on the fitting ring
74
. When screwing the retainer ring
76
, it is necessary to carefully check the direction of the elbow
75
so as to avoid deflection of the elbow
75
. Such procedure is troublesome and time-consuming.
In use of the pneumatic tool, the bit is laterally pressed against a work piece by a considerably great force. In operation, the retainer ring
76
suffers the vibration and the lateral force and is likely to loosen. As a result, the elbow
75
is apt to swing. This is very dangerous to the operator.
FIGS. 10 and 11
show an improved conventional pneumatic tool the main body
8
of which integrally has an elbow
81
. A pneumatic motor
82
, a switch unit
83
and an intake unit
84
are respectively mounted in lower side and lateral side of the main body
8
. A driving unit
85
is installed in the elbow
81
.
According to the above arrangement, the elbow
81
is integrally connected with the main body
8
and is thus prevented from loosening due to lateral force. However, when assembled, the pneumatic motor
82
is first installed into the main body
8
and then the switch unit
83
is mounted into the main body
8
from lateral side thereof to stop and fix the pneumatic motor
82
. The switch unit
83
must tightly fitted with the pneumatic motor
82
. Otherwise, the pneumatic motor
82
can be hardly firmly fixed and a leakage may take place during operation. The tight fit design makes it difficult to mount the switch unit
83
. When assembling the switch unit
83
, on one hand, it is necessary to tightly press the pneumatic motor
82
, with a tool and on the other hand, the switch unit
83
must be at the same time installed in. In case of untrue cooperation, it will be impossible to complete the assembly. After the pneumatic motor
82
and the switch unit
83
are assembled, the intake unit
84
is assembled. Thereafter, a test is performed. In case that a problem is found in the test, it is necessary to disassemble all of the pneumatic motor
82
, the switch unit
83
and the intake unit
84
to separately test and solve the problem. After the problem is solved, it is necessary to again tightly fit the switch unit
83
with the pneumatic motor. Such procedure is complicated and troublesome.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to provide a pneumatic tool structure including a main body integrally having an elbow. A pneumatic motor, a switch unit and an intake unit are disposed in the main body. The top section of the elbow is formed with the opening corresponding to the main body. After the switch unit and the intake unit are installed into the main body, the pneumatic motor is placed into the main body from the opening. The installation of the pneumatic motor is easy and the test is facilitated.


REFERENCES:
patent: 3759336 (1973-09-01), Marcovitz et al.
patent: 3901098 (1975-08-01), Jinkins
patent: 3908139 (1975-09-01), Duncan, Jr.
patent: 4416338 (1983-11-01), Nelson et al.
patent: 4715203 (1987-12-01), Wiegenstein
patent: 5203417 (1993-04-01), Glaser
patent: 5419403 (1995-05-01), Klemm
patent: 6044917 (2000-04-01), Brunhoelzl
patent: 6082468 (2000-07-01), Pusateri et al.
patent: 6149356 (2000-11-01), Chu et al.

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