US20070158091A1 - Power hand tool having power transmission clutch - Google Patents
Power hand tool having power transmission clutch Download PDFInfo
- Publication number
- US20070158091A1 US20070158091A1 US11/328,250 US32825006A US2007158091A1 US 20070158091 A1 US20070158091 A1 US 20070158091A1 US 32825006 A US32825006 A US 32825006A US 2007158091 A1 US2007158091 A1 US 2007158091A1
- Authority
- US
- United States
- Prior art keywords
- power transmission
- transmission member
- power
- housing
- coupling hole
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
-
- 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
Definitions
- the present invention relates generally to power hand tools and more particularly, to a power hand tool, which has a power transmission clutch.
- the present invention has been accomplished under the circumstances in view. It is therefore the primary object of the present invention to provide a power hand tool, which automatically interrupts power transmission when not in the operative status, preventing the occurrence of an accident.
- the power hand tool comprises a housing, a motor fixedly mounted inside the housing, a transmission gear set mounted inside the housing, a first power transmission member, a second power transmission member and a spring member.
- the transmission gear set has an input gear fixedly mounted on an output shaft of the motor, and an output gear rotatable by the input gear directly or indirectly.
- the first power transmission member is coupled to the output gear for rotation with the output gear.
- the first power transmission member has a coupling hole.
- the second power transmission member is rotatably mounted inside the housing and axially movable in the housing between a first position and a second position.
- the first shaft sleeve 31 is sleeved onto the first power transmission member 50 and affixed to the inside of the housing 10 .
- the second power transmission member 70 is a round rod inserted through the second shaft sleeve 32 , having a coupling portion 72 of a hexagonal pin and axially extended from one end thereof for coupling to the hexagonal coupling hole 51 of the first power transmission member 50 and a hexagonal coupling hole 71 axially disposed in the other end for receiving a tool bit.
- the second power transmission member 70 can be rotated in the second shaft sleeve 32 and axially movable relative to the second shaft sleeve 32 between a first position and a second position.
- the hexagonal coupling hole 71 of the second power transmission member 70 is kept exposed to the outside of the housing 10 .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
Abstract
A power hand tool includes a housing for holding a motor therein, a transmission gear set coupled to an output shaft of the motor, a first power transmission member coupled to an output gear of the transmission gear set, a second power transmission member which is rotatably mounted in the housing and coupled to the first power transmission member for synchronous rotation when it is axially inwardly pressed, and a spring member for pushing the second power transmission member away from the first power transmission member for enabling the first power transmission member to run idle.
Description
- 1. Field of the Invention
- The present invention relates generally to power hand tools and more particularly, to a power hand tool, which has a power transmission clutch.
- 2. Description of the Related Art
- A conventional power screwdriver is known comprising a motor, a transmission gear set coupled to the output shaft of the motor and adapted to reduce the revolving speed and increase the torque for output through an output member, which has a connector for receiving a screwdriver bit (cabinet bit, keystone bit, or Phillips head bit) for rotating the workpiece.
- The aforesaid power screwdriver is functional; however, it is not safe in use. When the user pressed on the on/off button, the tool bit is rotated immediately with the output member. When a child plays with this kind of power screwdriver for fun and/or an unskilled person uses this kind of power screwdriver, an accident may happen accidentally.
- The present invention has been accomplished under the circumstances in view. It is therefore the primary object of the present invention to provide a power hand tool, which automatically interrupts power transmission when not in the operative status, preventing the occurrence of an accident.
- To achieve this object of the present invention, the power hand tool comprises a housing, a motor fixedly mounted inside the housing, a transmission gear set mounted inside the housing, a first power transmission member, a second power transmission member and a spring member. The transmission gear set has an input gear fixedly mounted on an output shaft of the motor, and an output gear rotatable by the input gear directly or indirectly. The first power transmission member is coupled to the output gear for rotation with the output gear. The first power transmission member has a coupling hole. The second power transmission member is rotatably mounted inside the housing and axially movable in the housing between a first position and a second position. The second power transmission member has a coupling portion disposed at a first end thereof and a coupling hole disposed at a second end thereof outside the housing for receiving a tool bit. The coupling portion of the second power transmission member is engaged into the coupling hole of the first power transmission member for allowing rotation of the second power transmission member with the first power transmission member when the second power transmission member is moved to the second position. The coupling portion of the second power transmission member is disengaged from the coupling hole of the first power transmission member for allowing the first transmission member to run idle when the second power transmission member is moved to the first position. The spring member is mounted in the coupling hole of the first power transmission member and stopped against the second power transmission member to support the second power transmission member in the first position.
-
FIG. 1 is an exploded view of a power hand tool according to a preferred embodiment of the present invention. -
FIG. 2 is another exploded view in an enlarged scale of a part of the power hand tool according to the preferred embodiment of the present invention. -
FIG. 3 is a partial sectional view of the power hand tool of the preferred embodiment of the present invention, showing the second power transmission member disconnected from the first power transmission member. -
FIG. 4 is similar toFIG. 3 but showing the second power transmission member connected to the first power transmission member. - As shown in
FIGS. 1 and 2 , apower hand tool 100 in accordance with the preferred embodiment of the present invention comprises ahousing 10, amotor 20, afirst shaft sleeve 31, asecond shaft sleeve 32, atransmission gear set 40, a firstpower transmission member 50, aspring member 60, and a secondpower transmission member 70. - The
housing 10 comprises two half shells, namely, thefirst half shell 11 and thesecond half shell 12. The twohalf shells - The
motor 20 is fixedly mounted inside thehousing 10, having anoutput shaft 21. - The
transmission gear set 40 is mounted inside thehousing 10, comprising aninput gear 41 fixedly mounted on theoutput shaft 21 of themotor 20 and anoutput gear 42 meshed with theinput gear 41. During rotation of themotor 20, theinput gear 41 drives theoutput gear 42 to rotate at a relatively lower revolving speed. Intermediate gears may be coupled between theinput gear 41 and theoutput gear 42 for producing various speed-reducing functions. - The first
power transmission member 50 is fixedly mounted on theoutput gear 42, having acoupling hole 51. Thecoupling hole 51 is a hexagonal hole. Further, the central axis of the firstpower transmission member 50 coincides with the transmission axis of theoutput gear 42. - The
first shaft sleeve 31 is sleeved onto the firstpower transmission member 50 and affixed to the inside of thehousing 10. - The
spring member 60 is mounted in thecoupling hole 51 of the firstpower transmission member 50. - The
second shaft sleeve 32 is fixedly mounted inside thehousing 10. Further, the central axis of thesecond shaft sleeve 32 coincides with the central axis of thefirst shaft sleeve 31. - The second
power transmission member 70 is a round rod inserted through thesecond shaft sleeve 32, having acoupling portion 72 of a hexagonal pin and axially extended from one end thereof for coupling to thehexagonal coupling hole 51 of the firstpower transmission member 50 and ahexagonal coupling hole 71 axially disposed in the other end for receiving a tool bit. The secondpower transmission member 70 can be rotated in thesecond shaft sleeve 32 and axially movable relative to thesecond shaft sleeve 32 between a first position and a second position. Thehexagonal coupling hole 71 of the secondpower transmission member 70 is kept exposed to the outside of thehousing 10. When the secondpower transmission member 70 is in the second position, thecoupling portion 72 is engaged into thecoupling hole 51 of the firstpower transmission member 50. The secondpower transmission member 70 further has a locatinggroove 73 extending around the periphery for the mounting of a C-shaped retainer 74 to define the first position. - The operation of the
power hand tool 100 is quite simple and outlined hereinafter. - When the
power hand tool 100 is not used, thespring member 60 forces the secondpower transmission member 70 out of the firstpower transmission member 50, i.e., thespring member 60 supports the secondpower transmission member 70 to the first position, as shown inFIG. 3 , where the C-shaped retainer 74 is stopped at a portion of thehousing 10. In case the user starts themotor 20 accidentally at this time, themotor 50 drives the transmission gear set 40 and the firstpower transmission member 50 to rotate; however, this rotary driving force is not transmitted to the secondpower transmission member 70, i.e., the tool bit 80 (for example, screwdriver bit) is not rotated. - When using the
power hand tool 100, the user will stop thetool bit 80 against the workpiece 90 (for example, screw). At this time, a reactive force F will be produced from theworkpiece 90 to push thesecond transmission member 70 against thespring member 60 toward the second position, as shown inFIG. 4 , thereby forcing thecoupling portion 72 into thehexagonal coupling hole 51 of the firstpower transmission member 50. Therefore, the rotary driving force from themotor 20 is transmitted through the transmission gear set 40 to the firstpower transmission member 50 and then the secondpower transmission member 70, thereby causing thetool bit 80 to rotate theworkpiece 90. - When the user disengaged the
tool bit 80 from theworkpiece 90, the aforesaid reactive force F is disappeared, and thespring member 60 immediately pushes the secondpower transmission member 70 from the second position to the first position, and therefore the connection between the firstpower transmission member 50 and the secondpower transmission member 70 is interrupted. In other words, thepower hand tool 100 provides a power transmission clutch constructed mainly by the firstpower transmission member 50, thespring member 60 and the secondpower transmission member 70.
Claims (3)
1. A power hand tool comprising:
a housing;
a motor fixedly mounted inside said housing, said motor having an output shaft;
a transmission gear set mounted inside said housing, said transmission gear set having an input gear fixedly mounted on the output shaft of said motor, and an output gear rotatable by said input gear directly or indirectly;
a first power transmission member coupled to said output gear for rotation with said output gear, said first power transmission member having a coupling hole;
a second power transmission member rotatably mounted inside said housing and axially movable in said housing between a first position and a second position, said second power transmission member having a coupling portion disposed at a first end thereof and a coupling hole disposed at a second end thereof outside said housing for receiving a tool bit, said coupling portion of said second power transmission member being engaged into the coupling hole of said first power transmission member for allowing rotation of said second power transmission member with said first power transmission member when said second power transmission member is moved to said second position, said coupling portion of said second power transmission member being disengaged from the coupling hole of said first power transmission member for allowing said first transmission member to run idle during operation of said motor when said second power transmission member is moved to said first position; and
a spring member mounted in the coupling hole of said first power transmission member and stopped against said second power transmission member to support said second power transmission member in said first position.
2. The power hand tool as claimed in claim 1 , further comprising two shaft sleeves respectively sleeved onto said first power transmission member and said second power transmission member and fixedly mounted inside said housing.
3. The power hand tool as claimed in claim 1 , wherein the coupling hole of said first power transmission member is a hexagonal hole, and the coupling portion of said second power transmission member has a shape fitting the hexagonal coupling hole of said first power transmission member.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/328,250 US20070158091A1 (en) | 2006-01-10 | 2006-01-10 | Power hand tool having power transmission clutch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/328,250 US20070158091A1 (en) | 2006-01-10 | 2006-01-10 | Power hand tool having power transmission clutch |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070158091A1 true US20070158091A1 (en) | 2007-07-12 |
Family
ID=38231655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/328,250 Abandoned US20070158091A1 (en) | 2006-01-10 | 2006-01-10 | Power hand tool having power transmission clutch |
Country Status (1)
Country | Link |
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US (1) | US20070158091A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120247174A1 (en) * | 2009-12-18 | 2012-10-04 | A. Raymond Et Cie | Device for setting fastening elements |
US20130081840A1 (en) * | 2011-10-04 | 2013-04-04 | Yonosuke Aoki | Power Tool |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4154308A (en) * | 1977-10-25 | 1979-05-15 | Dresser Industries, Inc. | Low torque automatic screwdriver |
US4213471A (en) * | 1978-05-15 | 1980-07-22 | Clairol, Inc | Manicuring unit |
US4493223A (en) * | 1981-10-05 | 1985-01-15 | Matsushita Electric Works, Ltd. | Gear shifting speed change apparatus for a rotary electric tool |
US4597453A (en) * | 1985-02-08 | 1986-07-01 | Cooper Industries, Inc. | Drive unit with self-aligning gearing system |
US4883130A (en) * | 1988-08-31 | 1989-11-28 | Dixon Automatic Tool, Inc. | Dual speed transmission for automatic assembly machine |
US5343961A (en) * | 1991-10-31 | 1994-09-06 | Makita Corporation | Power transmission mechanism of power-driven rotary tools |
US5360073A (en) * | 1992-03-12 | 1994-11-01 | Ryobi Limited | Battery type screw driver |
US5550416A (en) * | 1995-02-09 | 1996-08-27 | Fanchang; We C. | Control mechanism of revolving speed of an electric tool |
US5730232A (en) * | 1996-04-10 | 1998-03-24 | Mixer; John E. | Two-speed fastener driver |
US5897454A (en) * | 1996-01-31 | 1999-04-27 | Black & Decker Inc. | Automatic variable transmission for power tool |
US5954144A (en) * | 1995-06-14 | 1999-09-21 | Intool Incorporated | Variable-speed, multiple-drive power tool |
US6093128A (en) * | 1999-03-12 | 2000-07-25 | Ingersoll-Rand Company | Ratchet wrench having self-shifting transmission apparatus |
US7134364B2 (en) * | 2003-09-29 | 2006-11-14 | Robert Bosch Gmbh | Battery-driven screwdriver |
-
2006
- 2006-01-10 US US11/328,250 patent/US20070158091A1/en not_active Abandoned
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4154308A (en) * | 1977-10-25 | 1979-05-15 | Dresser Industries, Inc. | Low torque automatic screwdriver |
US4213471A (en) * | 1978-05-15 | 1980-07-22 | Clairol, Inc | Manicuring unit |
US4493223A (en) * | 1981-10-05 | 1985-01-15 | Matsushita Electric Works, Ltd. | Gear shifting speed change apparatus for a rotary electric tool |
US4597453A (en) * | 1985-02-08 | 1986-07-01 | Cooper Industries, Inc. | Drive unit with self-aligning gearing system |
US4883130A (en) * | 1988-08-31 | 1989-11-28 | Dixon Automatic Tool, Inc. | Dual speed transmission for automatic assembly machine |
US5343961A (en) * | 1991-10-31 | 1994-09-06 | Makita Corporation | Power transmission mechanism of power-driven rotary tools |
US5360073A (en) * | 1992-03-12 | 1994-11-01 | Ryobi Limited | Battery type screw driver |
US5550416A (en) * | 1995-02-09 | 1996-08-27 | Fanchang; We C. | Control mechanism of revolving speed of an electric tool |
US5954144A (en) * | 1995-06-14 | 1999-09-21 | Intool Incorporated | Variable-speed, multiple-drive power tool |
US5897454A (en) * | 1996-01-31 | 1999-04-27 | Black & Decker Inc. | Automatic variable transmission for power tool |
US5730232A (en) * | 1996-04-10 | 1998-03-24 | Mixer; John E. | Two-speed fastener driver |
US6093128A (en) * | 1999-03-12 | 2000-07-25 | Ingersoll-Rand Company | Ratchet wrench having self-shifting transmission apparatus |
US7134364B2 (en) * | 2003-09-29 | 2006-11-14 | Robert Bosch Gmbh | Battery-driven screwdriver |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120247174A1 (en) * | 2009-12-18 | 2012-10-04 | A. Raymond Et Cie | Device for setting fastening elements |
US8959977B2 (en) * | 2009-12-18 | 2015-02-24 | A. Raymond Et Cie | Device for setting fastening elements |
US20130081840A1 (en) * | 2011-10-04 | 2013-04-04 | Yonosuke Aoki | Power Tool |
US9533406B2 (en) * | 2011-10-04 | 2017-01-03 | Makita Corporation | Power tool |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MOBILETRON ELECTRONICS CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HSU, MING-HUNG;REEL/FRAME:017459/0947 Effective date: 20051226 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |