192 clutches and power-stop control – Clutches – Torque responsive
Reexamination Certificate
2001-04-19
2003-03-18
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Clutches
Torque responsive
C192S056610, C192S11000B, C192S150000, C081S058300
Reexamination Certificate
active
06533093
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an electric drill that has a torque adjusting device which allows the output of strong torque.
BACKGROUND OF THE INVENTION
A conventional torque adjusting device for an electric drill is shown in
FIGS. 1 and 2
and generally includes a motor
1
which has a driving shaft
100
which is engaged with a solar gear system
21
which is composed of three gears
210
. The three gears
210
are engaged with an inner toothed periphery
230
of a ring member
23
and a driving part
220
having three rods respectively extending through the three gears
210
. The ring member
23
has notches
230
defined in an end thereof and a casing
20
is mounted to the driving part
220
. The casing
20
has a tube
24
through which the output shaft
4
extends and the output shaft
4
is securely engaged with the driving part
220
. The casing
20
has an annular arranged holes
200
and each hole has a ball
22
received therein which is also engaged with one of the notches
230
of the ring member
23
. The casing
20
is received in an adjusting cone
3
which has a spirally stepped shoulder
31
defined in an inner periphery thereof and a compressing ring
32
is engaged with the shoulders
31
. A spring
30
is mounted to the tube
24
and the compressing ring
32
and a press ring
33
are respectively located on two ends of the spring
30
wherein the pressing ring
33
seals the holes
200
in the casing
20
. As shown in
FIG. 3
, when the cone
3
is rotated to let a wider portion of the shoulder
31
contact the compressing ring
32
and compresses the spring
30
, the balls
22
are securely engaged with the notches
230
so that the ring member
23
is not rotated by the compression force of the balls
22
and the output shaft
4
transforms the torque of the motor
1
. When rotating the cone
3
to let a narrower portion of the shoulder
31
contact the compressing ring
32
, the spring
30
is applied a smaller force and the balls
22
apply a small force to the ring member
23
so that the ring member
23
can be rotated. Therefore, when the ring member
23
is rotated and the balls
22
are not located in the notches
230
, the driving part
220
is not rotated and only the gears
210
rotate about the respective rods. The output shaft
4
at this moment when the balls
22
are not located in the notches outputs the least torque. However, the spring
30
has its largest deformation limitation so that it is difficult to compress the balls
22
to a desired level and this is the reason why the conventional torque adjusting device cannot completely transform the torque of the motor to the output shaft
4
.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a torque adjusting device and comprising a driving part having a plurality of rods and each rod has a gear rotatably mounted thereto. The gears are engaged with a motor's driving shaft and the driving part is received in an annular member which has a toothed inner periphery engaged with the gears, a plurality of grooves defined longitudinally in an outer periphery of the annular member and a plurality of notches defined in an end of the annular member. A mounting member has a plurality of first passages which are located in alignment with the notches and a ball is received in each of the first passages and engaged with one of the notches. A plurality of second passages are defined through the mounting member and located in alignment with the grooves. Each of second passages has a pin movably received therein and the mounting member has a threaded tube.
An adjusting cap is mounted to the threaded tube and a ring member is fixedly connected to an inside of the cap. The ring member is threadedly mounted to the threaded tube. A first end of a spring is engaged with the ring member and a second of the spring contacts a pressing ring which compresses the balls to engage with the notches. The ring member has contacting parts which push the pins into the grooves when the spring is compressed. An output shaft has an end fixedly connected to the driving part and the other end of the output shaft extends through the threaded tube and the adjusting cap.
The primary object of the present invention is to provide a torque adjusting device for an electric drill wherein the device has pins to be engaged with longitudinal grooves in the annular member so as to output a large torque.
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: 3752278 (1973-08-01), States
patent: 3754412 (1973-08-01), Briggs
patent: 5277527 (1994-01-01), Yokota et al.
patent: 5738469 (1998-04-01), Hsu
patent: 6010426 (2000-01-01), Nakamura
patent: 6305481 (2001-10-01), Yamazaki et al.
patent: 2 334 910 (1999-08-01), None
Bonck Rodney H.
Power Network Industry Co., Ltd.
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