Tool driving or impacting – Impacting devices – With anvil arranged to transmit torsional impact to tool
Reexamination Certificate
2001-08-06
2003-03-04
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
With anvil arranged to transmit torsional impact to tool
C173S093000
Reexamination Certificate
active
06527061
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a driving mechanism for pneumatic tools and rotor rotatably contacts the inside of the casing at two surfaces and one point so that the rotor can be operated by large torque.
BACKGROUND OF THE INVENTION
A conventional driving mechanism for pneumatic tools is shown in
FIGS. 1
to
3
and generally includes a casing
10
having a front hole
12
in a front surface of the casing
10
and a rear hole
13
in a rear surface of the casing
10
. A rotor
20
is rotatably received in the casing
10
and has two grooves
23
and
24
respectively defined in two opposite outside of the rotor
20
. A hole
21
is defined in the rotor
20
and two driving surfaces
22
extend inward from an inside of the hole
21
. Two rods
18
extend through the front surface of the casing
10
and are respectively engaged with the two grooves
23
,
24
so as to connect the rotor
20
to the casing
10
. A shaft
30
extends through the front hole
12
of the casing
10
and the hole
21
in the rotor
20
. A front end of the shaft
30
has an engaging member
34
to be connected with a socket (not shown) and a rear end
32
of the shaft
30
is engaged with the rear hole
13
. The casing
10
further has a toothed driving part
14
so as to be connected to a driving source. A block
33
extends from the shaft
30
and is located in the hole
21
of the rotor
20
. A flange
31
is engaged with the inside of front surface so that the shaft
30
will not drop from the front hole
12
. Referring to
FIGS. 4 and 5
, when the casing
10
is rotated, the rotor
20
is rotated together with the casing
10
and the block
33
will be pushed by the driving surface
22
so as to output a torque.
Referring to
FIG. 6
, when the object to be tightened is locked, the shaft
30
cannot be rotated any further, the rotor
20
is forced to roll on one of the rods
18
a small angle to disengage the driving surface
22
from the block
33
. The rotor
20
keeps on rotating and the point “A” contacts the block
33
and pushes the rotor
20
to roll on the rod
18
to its operation position again. Therefore, the driving surface
22
can impact the block
33
again. If the user feels two or three times of the shifting of the rotor
20
, he/she knows that the object is totally tightened.
FIG. 9
shows that two rotors
20
are installed in the casing
10
and the shaft
30
has two blocks
33
so that the shaft
30
can be operated in balance.
The torque output is decided by the engagement between the two rods
18
and the two grooves
23
,
24
. The rods
18
could be worn out to affect the torque and the block
33
is driven by only one driving surface
22
may cause shaking.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a driving mechanism for pneumatic tools and the mechanism comprises a casing having a groove defined in an inner periphery of the casing and two support surfaces extend from the inner periphery of the casing. A rotor is received in the casing and has a passage defined therethrough. A ridge extends from an outer periphery of the rotor and is engaged with the groove of the casing. A surface is defined in an outer periphery of the rotor and engaged with the two support surface. Two driving surfaces are defined in an inner periphery of the rotor. A shaft extends through the passage of the rotor and has a protrusion extending from an outer periphery of the shaft. The protrusion is driven by one of the two driving surfaces.
The primary object of the present invention is to provide a driving mechanism for a pneumatic tool wherein the shaft is driven by two driving surfaces.
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: 3321043 (1967-05-01), Vaughn
patent: 3533479 (1970-10-01), Madsen et al.
patent: 5435398 (1995-07-01), Juan
patent: 5645130 (1997-07-01), Schoeps
patent: 5887666 (1999-03-01), Chen et al.
patent: 5906244 (1999-05-01), Thompson et al.
patent: 6024180 (2000-02-01), Lin
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