CA2087321A1 - Driving mechanism of a power wrench - Google Patents
Driving mechanism of a power wrenchInfo
- Publication number
- CA2087321A1 CA2087321A1 CA002087321A CA2087321A CA2087321A1 CA 2087321 A1 CA2087321 A1 CA 2087321A1 CA 002087321 A CA002087321 A CA 002087321A CA 2087321 A CA2087321 A CA 2087321A CA 2087321 A1 CA2087321 A1 CA 2087321A1
- Authority
- CA
- Canada
- Prior art keywords
- driving mechanism
- driving
- power wrench
- shaft
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
- B25B21/02—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose with means for imparting impact to screwdriver blade or nut socket
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
Abstract:
A power wrench for removing a bolt or nut, comprising a housing in the shape of a pistol having provided in a rear portion thereof a driving motor; a driving mechanism, which is connected to a driving shaft of the driving motor with a clutch member; an actuating shaft which is sleeved inside the driving mechanism;
wherein said driving mechanism is made partially of a cast iron and partially of a plastic material.
A power wrench for removing a bolt or nut, comprising a housing in the shape of a pistol having provided in a rear portion thereof a driving motor; a driving mechanism, which is connected to a driving shaft of the driving motor with a clutch member; an actuating shaft which is sleeved inside the driving mechanism;
wherein said driving mechanism is made partially of a cast iron and partially of a plastic material.
Description
- 2 ~ J~
TITLE: AN IMPROVEMENT ON THE DRIVING MECHANISM OF A POWER WRENCH
Field of The Invention This inventi~n relates to an improvement on a power wrench, and more particularly to an improvement on the driving mechanism of a power wrench for removing a bolt or a nut from the axle of a vehicle.
, BACKGRO~ND OF THE INVENTION
This invention is an improvement on a driving device of a power wrench described on the ~S patent No. 4,727,780, issued to the inventor on March 1, 1988, which disclosed a power wrench for removing or unscrewing the bolts or nuts fastening the hub of a tire to an automobile axle. Such a power wrench comprises a ~`
housing in the shape of a pistol, having provided in the rear portion a drlving motor; a driving mechanism, which is connected to lS the driving shaft of the driving motor via a clutch memberi an actuating shaft which is sleeved inside the driving mechanism.
When the driving shaft reaches a pre-cletermined angular speed, the clutch member actuates the driving mechanism to rotate with the actuating shaft to transmit a torque to remove a bolt or a nut from ~0 the automobile axle.
In the above described power wrench, the driving mechanism is made of cast iron and thus having quite a weight. The weight is relatively high with respect to the torque provided by -~
the driving mechanism. ~ ;~
~732~
Hence a primary object of the invention is to provide an improved driving mechanism of a power wrench, which is has a high torque-to-weight ratio as compared to the prior art struc'cures.
These and other objects of the present invention will no doubt become apparent to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment illustrated in the drawings.
IN THE DRAWING
Figure 1 is a sectional view of the preferred embodiment of the invention; and Fig~re 2 is the an exploded perspective view of the preferred embodiment of the present invention.
With reference to Figure 1, which is a sectional view of a preferred embodiment of the present invention, a power wrench 1 according to the invention comprises a housing 1 in the shape of a pistol which i5 divided into a rear apartment 11 and a front apartment 12. A driving motor 20 is provided in the rear apartment 11 of the housing 10. The driving shaft 21 of the driving motor 20 extends from the rear apartment 11 of the housing 1 into the front apartment 12 of the housing 10. A driving mechanism 40 which is onnected to the driving shaft 21 via a clutch member 30. Hence the driving mechanism 40 is rotatable with the driving shaft 21 of the driving motor 20. The driving ~echanism 40 further includes a swivel block 41 which is positioned with a rod member 31 of the clutch member 30. Figure 2 will be described in detail. An actuating shaft 50 which is installed within the driving mechanism ` 2 ~ ~ 7 -~ C~.~
40 and extends from the front apartment 12, out of the housing 10.
The actuating shaft 50 has a cam portion 51 which is in mechanical connection with the swivel block 41.
In operation, as a power switch 60 which is in electrical connection with and controlling the actuation of the motor 20 is triggered, the driving shaft 21 rotates with the motor 20. The driving mechanism 40 rotates with the driving shaft 21 as well.
When the angular speed is lower thatn a pre-set level, the swivel block 41 will remain unmoved. As the angular speed increases to the pre-set level, the clutch member 30 will act to withdraw the rod member 31 and thus allowing the swivel block 41 to be in contact with -the cam portion 51 of the actuating shaft 50. The driving mechanism 40 will then provide a torque to the actuating shaft 50 to remove a bolt or a nut from a axle.
In the prior art structure, the driving mechanism 40 is made of a piece cast iron, hence the torque-to-weight ratio of the power wrench is relatively small. The term "torque-to-weight ratio" used herein indicates the ratio of the torque generated by the power wrench to the weight of the driving mechanism. In ordér to reduce the total weight of the power wrench, the driving mechanism 40 of the instand invention is made partially of a cast iron and partially of a plastic material. This can largely reduce the weight of the driving mechanism 40 and still provide the required torque to remove a bolt or a nut from a axle.
These advantages of the present invention will be apparent to those skilled in the art. Thus the embodiment --" '2 ~ 2 1 described herein is only by way of example and sho~ld not be construed as restrictive. The scope of the invention is indicated by the appended claim, and all -the modifications thereby embraced are included in the present invention.
i ~, :
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....
TITLE: AN IMPROVEMENT ON THE DRIVING MECHANISM OF A POWER WRENCH
Field of The Invention This inventi~n relates to an improvement on a power wrench, and more particularly to an improvement on the driving mechanism of a power wrench for removing a bolt or a nut from the axle of a vehicle.
, BACKGRO~ND OF THE INVENTION
This invention is an improvement on a driving device of a power wrench described on the ~S patent No. 4,727,780, issued to the inventor on March 1, 1988, which disclosed a power wrench for removing or unscrewing the bolts or nuts fastening the hub of a tire to an automobile axle. Such a power wrench comprises a ~`
housing in the shape of a pistol, having provided in the rear portion a drlving motor; a driving mechanism, which is connected to lS the driving shaft of the driving motor via a clutch memberi an actuating shaft which is sleeved inside the driving mechanism.
When the driving shaft reaches a pre-cletermined angular speed, the clutch member actuates the driving mechanism to rotate with the actuating shaft to transmit a torque to remove a bolt or a nut from ~0 the automobile axle.
In the above described power wrench, the driving mechanism is made of cast iron and thus having quite a weight. The weight is relatively high with respect to the torque provided by -~
the driving mechanism. ~ ;~
~732~
Hence a primary object of the invention is to provide an improved driving mechanism of a power wrench, which is has a high torque-to-weight ratio as compared to the prior art struc'cures.
These and other objects of the present invention will no doubt become apparent to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment illustrated in the drawings.
IN THE DRAWING
Figure 1 is a sectional view of the preferred embodiment of the invention; and Fig~re 2 is the an exploded perspective view of the preferred embodiment of the present invention.
With reference to Figure 1, which is a sectional view of a preferred embodiment of the present invention, a power wrench 1 according to the invention comprises a housing 1 in the shape of a pistol which i5 divided into a rear apartment 11 and a front apartment 12. A driving motor 20 is provided in the rear apartment 11 of the housing 10. The driving shaft 21 of the driving motor 20 extends from the rear apartment 11 of the housing 1 into the front apartment 12 of the housing 10. A driving mechanism 40 which is onnected to the driving shaft 21 via a clutch member 30. Hence the driving mechanism 40 is rotatable with the driving shaft 21 of the driving motor 20. The driving ~echanism 40 further includes a swivel block 41 which is positioned with a rod member 31 of the clutch member 30. Figure 2 will be described in detail. An actuating shaft 50 which is installed within the driving mechanism ` 2 ~ ~ 7 -~ C~.~
40 and extends from the front apartment 12, out of the housing 10.
The actuating shaft 50 has a cam portion 51 which is in mechanical connection with the swivel block 41.
In operation, as a power switch 60 which is in electrical connection with and controlling the actuation of the motor 20 is triggered, the driving shaft 21 rotates with the motor 20. The driving mechanism 40 rotates with the driving shaft 21 as well.
When the angular speed is lower thatn a pre-set level, the swivel block 41 will remain unmoved. As the angular speed increases to the pre-set level, the clutch member 30 will act to withdraw the rod member 31 and thus allowing the swivel block 41 to be in contact with -the cam portion 51 of the actuating shaft 50. The driving mechanism 40 will then provide a torque to the actuating shaft 50 to remove a bolt or a nut from a axle.
In the prior art structure, the driving mechanism 40 is made of a piece cast iron, hence the torque-to-weight ratio of the power wrench is relatively small. The term "torque-to-weight ratio" used herein indicates the ratio of the torque generated by the power wrench to the weight of the driving mechanism. In ordér to reduce the total weight of the power wrench, the driving mechanism 40 of the instand invention is made partially of a cast iron and partially of a plastic material. This can largely reduce the weight of the driving mechanism 40 and still provide the required torque to remove a bolt or a nut from a axle.
These advantages of the present invention will be apparent to those skilled in the art. Thus the embodiment --" '2 ~ 2 1 described herein is only by way of example and sho~ld not be construed as restrictive. The scope of the invention is indicated by the appended claim, and all -the modifications thereby embraced are included in the present invention.
i ~, :
l ,, . . -,.
~ .
.1 .. :.`.~`.~
.~
'~
; ~ ~
....
Claims
1. A power wrench for removing a bolt or nut, comprising a housing in the shape of a pistol having provided in a rear portion thereof a driving motor; a driving mechanism, which is connected to a driving shaft of the driving motor with a clutch member; an actuating shaft which is sleeved inside the driving mechanism; wherein said driving mechanism is made partially of a cast iron and partially of a plastic material.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002087321A CA2087321A1 (en) | 1993-01-14 | 1993-01-14 | Driving mechanism of a power wrench |
| GB9301095A GB2274415A (en) | 1993-01-14 | 1993-01-20 | Power wrench |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002087321A CA2087321A1 (en) | 1993-01-14 | 1993-01-14 | Driving mechanism of a power wrench |
| GB9301095A GB2274415A (en) | 1993-01-14 | 1993-01-20 | Power wrench |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2087321A1 true CA2087321A1 (en) | 1994-07-15 |
Family
ID=25675822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002087321A Abandoned CA2087321A1 (en) | 1993-01-14 | 1993-01-14 | Driving mechanism of a power wrench |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2087321A1 (en) |
| GB (1) | GB2274415A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE6944744U (en) * | 1969-11-18 | 1971-04-29 | Bosch Gmbh Robert | DRIVE MACHINE. |
| ATE117928T1 (en) * | 1990-11-16 | 1995-02-15 | Huang Dora Hsiao Ling | WRENCH. |
-
1993
- 1993-01-14 CA CA002087321A patent/CA2087321A1/en not_active Abandoned
- 1993-01-20 GB GB9301095A patent/GB2274415A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| GB9301095D0 (en) | 1993-03-10 |
| GB2274415A (en) | 1994-07-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |