Elastomeric driver return assembly for an electro-mechanical fastener driving tool
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B25C-005/02
B25C-005/06
B25F-007/00
출원번호
US-0479968
(1983-03-29)
발명자
/ 주소
Warman, Thomas E.
Baker, Gordon P.
Smith, James E.
출원인 / 주소
Sencorp
대리인 / 주소
Frost & Jacobs
인용정보
피인용 횟수 :
40인용 특허 :
10
초록▼
A driver return assembly for an electro-mechanical fastener driving tool. The tool is of the type provided with a driver which is frictionally moved through a working stroke by means of an electrically driven flywheel which presses the driver against a support element, such as a counter rotating fly
A driver return assembly for an electro-mechanical fastener driving tool. The tool is of the type provided with a driver which is frictionally moved through a working stroke by means of an electrically driven flywheel which presses the driver against a support element, such as a counter rotating flywheel, a low inertia roller, or the like. The driver return assembly comprises at least one elastomeric cord being attached at one of its ends to the driver and at the other of its ends to an anchor within the tool. The at least one elastomeric cord, between its ends, passes about at least two pulleys. One of the pulleys is mounted on a spring supported shaft to compensate for stretch of the at least one elastomeric cord to assure that the driver is returned to its normal, retracted position after each working stroke.
대표청구항▼
1. In combination, a driver return assembly and an electromechanical fastener driving tool of the type having a driver, an electrically driven flywheel, together with a support element to engage said driver and move said driver through a working stroke, and at least one elastomeric cord affixed at o
1. In combination, a driver return assembly and an electromechanical fastener driving tool of the type having a driver, an electrically driven flywheel, together with a support element to engage said driver and move said driver through a working stroke, and at least one elastomeric cord affixed at one end to said driver and at the other end to a first anchoring means within said tool to return said driver to a normal retracted position after the working stroke, said driver return assembly comprising said at least one elastomeric cord and at least two rotatable pulleys over which said elastomeric cord passes, one of said pulleys being mounted on a fixed position shaft near that end of said driver to which said cord is affixed when said driver is in said normal retracted position, the other of said pulleys being mounted on a floating shaft spaced from said fixed position shaft, a second anchoring means within said tool, at least one tension spring, said floating shaft being connected to said second anchoring means by said at least one tension spring such that said pulley on said floating shaft applies tension to said elastomeric cord automatically, compensating for permanent stretch therein and assuring that said driver returns to its normal retracted position. 2. The structure claimed in claim 1 wherein said support element is a low inertia roller. 3. The structure claimed in claim 1 including guide means for said floating shaft. 4. The structure claimed in claim 1 including a U-shaped member having a pair of legs in parallel spaced relationship connected by a base portion, said floating shaft being mounted on said legs with said pulley thereon located between said legs, said tension spring being affixed at one end to said base portion and at the other end to said second anchoring means. 5. The structure claimed in claim 4 wherein said support element is a low inertial roller. 6. The structure claimed in claim 4 including guide means for said floating shaft. 7. The structure claimed in claim 1 including a plurality of elastomeric cords, one end of each of said cords being affixed to said driver and the other end of each of said cords being affixed to said first anchoring means within said tool, a plurality of pulleys being mounted on said fixed position shaft in spaced relationship, each of said cords passing about one of said last mentioned pulleys, a plurality of pulleys being mounted on said floating shaft in spaced relationship, each of said cords passing about one of said second mentioned pulleys, a pair of tension springs in spaced relationship, one end of each tension spring engaging said floating shaft, the other end of each of said tension springs engaging said second anchoring means within said tool. 8. The structure claimed in claim 7 wherein said support element is a low inertia roller. 9. The structure claimed in claim 6 including guide means for said floating shaft. 10. The structure claimed in claim 1 wherein said floating shaft is located near said fixed position shaft, and including a second fixed position shaft remote from said other shafts and having a pulley thereon, said elastomeric cord passing in order over said pulley on said first mentioned fixed position shaft, said pulley on said second fixed position shaft and said pulley on said floating shaft, a pair of tension springs, one end of each of said tension springs engaging said floating shaft on either side of said pulley thereon, the other end of each tension spring engaging said first mentioned fixed position shaft on either side of said pulley thereon. 11. The structure claimed in claim 10 wherein said support element is a low inertia roller. 12. The structure claimed in claim 10 including guide means for said floating shaft.
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이 특허에 인용된 특허 (10)
Smith James E. (Boulder CO) Baker Gordon P. (Amelia OH), Configured impact member for driven flywheel impact device.
Baskar, Ashok S.; Bradenbaugh, Charles L.; Schell, Craig A.; Kenney, James J.; Gross, Paul G., Driving tool with controller having microswitch for controlling operation of motor.
Berry, Alan; Sauerwein, William D.; Schell, Craig A.; Elligson, Jeffrey A.; Bradenbaugh, IV, Charles L.; White, Howard T.; Kenney, James J., Flywheel configuration for a power tool.
Buck, John E.; Berry, Alan; Bradenbaugh, IV, Charles L.; Schell, Craig A.; Gross, Paul; Baskar, Ashok S.; Colello, Steven R.; Kenney, James J., Structural backbone/motor mount for a power tool.
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