US3783955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power tool
Assignee: GKN Screws and Fasteners Ltd
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Filing: 1972-04-21
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Granted: 1974-01-08
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Expires: 1992-04-21
Abstract
Abstract A portable power tool having two work implements, such as a drill bit and a screwdriver bit, located at opposite ends of the body of the tool and facing in opposite directions with the body being mounted on a handle so that it can be turned through 180* relative to the handle to bring one or the other of the implements into a working position. The body is provided with guard means so that whichever implement is not working is covered by the guard means. An air motor for driving the work implements may be mounted in the body of the tool or in the handle and driving the work implements through suitable gearing.
Inventors
- 👤 P Gill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:19
CPC Classifications
B; B25; B25F; B25F3/00; Y; Y10; Y10T; Y10T408/00; Y10T408/31
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
207 words
A power tool including an elongate body; power means; two implement holders directed in opposite directions and disposed at or adjacent opposed end portions of the tool body and powered by said power means; a handle extending generally at right angles to the axis of elongation of the body and having trigger means for selectively operating said power means; and guard means arranged to guard one implement which is not in use while the other implement is being used, the guard means being operatively associated with the handle, the handle being rotatable on its own axis relative to the body of the tool between extreme positions in which the trigger means face towards each end portion and hence each implement respectively and the guard means being arranged so that, when the trigger means on the handle are directed towards one implement whereby that implement is in an operative condition in which it is capable of being used, the guard means is effective to guard the other implement from external contact and when the handle is rotated from said position prior to operating the other implement, the guard means is automatically moved thereby into a position where it is effective to guard said one implement from external contact.
Claim 2
Dependent Claim
207 words
A power tool including an elongate body; power means; two implement holders directed in opposite directions and disposed at or adjacent opposed end portions of the tool body and powered by said power means; a handle extending generally at right angles to the axis of elongation of the body and having trigger means for selectively operating said power means; and guard means arranged to guard one implement which is not in use while the other implement is being used, the guard means being operatively associated with the handle, the handle being rotatable on its own axis relative to the body of the tool between extreme positions in which the trigger means face towards each end portion and hence each implement respectively and the guard means being arranged so that, when the trigger means on the handle are directed towards one implement whereby that implement is in an operative condition in which it is capable of being used, the guard means is effective to guard the other implement from external contact and when the handle is rotated from said position prior to operating the other implement, the guard means is automatically moved thereby into a position where it is effective to guard said one implement from external contact.
Claim 3
Dependent Claim
97 words
A power tool according to claim 1 wherein the body is of generally cylindrical form and has a handle projecting transversely from one side thereof said handle being of generally cylindrical form and providing housing for an air motor and gearing, the output shaft from the air motor projecting into the body of the tool and the work implement holders being mounted in axial alignment on either side of said output shaft and each holder having a rotary shaft for supplying power to its work implement driven by gearing from the output shaft of the air motor.
Claim 4
Dependent Claim
92 words
A power tool according to claim 2 wherein the body comprises an outer casing which at its ends includes guard means for the work implements and an inner casing within which inner casing the aforesaid holders are mounted, the arrangement being that the outer casing is slidable upon the inner casing so that when relative sliding movement takes place between the outer and inner casings in one direction one of the work implements is projected beyond its associated guard means and the other work implement is withdrawn within its associated guard means.
Claim 5
Dependent Claim
95 words
A power tool according to claim 3 wherein the handle has an outer cylindrical housing arranged to project at right angles from the body and rack and pinion gearing is provided between the outer housing of the handle and the outer casing of the body whereby rotation of the outer casing of the body relative to the outer housing of the handle causes an axial displacement of the outer casing of the body relatively to the inner casing thereof thus causing movement of the respective guard means in relation to the work implements associated therewith.
Claim 6
Dependent Claim
38 words
A power tool according to claim 4 wherein a rack is fixed to the under side of the outer casing of the body and has meshing engagement with a pinion fixed to the outer housing of the handle.
Claim 7
Dependent Claim
106 words
A power tool according to claim 1 wherein the body is of generally cylindrical form and houses therein a motor for driving the shafts of both work holders the body being mounted upon a handle for rotation about an axis at right angles to the axis of the cylindrical body and the handle having fixed thereon a projecting guard means, the arrangement being that the body may be rotated through 180* so as to bring one implement out of the region of protection of the guard means into an operating position whilst moving the other implement back into the region of protection of the guard means.
Claim 8
Dependent Claim
56 words
A power tool According to claim 6 wherein the guard means comprises an arm fixed at one end to a handle adjacent where the body is mounted thereon said arm extending radially outwardly from the handle and having its outer end curved back to provide the guard for one or the other of the work implements.
Claim 9
Dependent Claim
110 words
A power tool according to claim 1 wherein the body is of generally cylindrical form and houses a motor and gearing for driving the holders arranged in axial alignment, the body being mounted for rotation upon a handle about an axis at right angles to the axis of the cylindrical body and there being provided at each end of the body a two-part guard comprising a first sleeve fixed to the body and a second sleeve telescopically engaged with the first sleeve so as to be movable between a fully extended position in which it guards its associated work implement and the retracted position in which it exposes the implement.
Claim 10
Dependent Claim
90 words
A power tool according to claim 8 wherein each two-part guard has the second sleeve slidable telescopically within the first sleeve and spring urged in the direction outwardly of the first sleeve, there being fixed to the handle of the tool, at the front thereof, a resilient locking member which projects through the wall of the outer sleeve and engages part of the inner sleeve, of the guard which is in the front position for operation of its implement, so as to hold the inner sleeve in the retracted position.
Claim 11
Dependent Claim
103 words
A power tool according to claim 9 wherein the said locking member comprises a nose at the free end of a resilient arm the upper end of which is fixed to the handle, the nose projecting through a circumferential slot in the outer sleeve and such slot being wider in the direction transverse to the axis of the sleeve than the nose, whereby a small angular movement of the body from the operative position results in the said part of the inner sleeve moving out of engagement with the nose to permit the inner sleeve to be spring urged to its outer position.
Claim 12
Dependent Claim
59 words
A power tool according to claim 10 wherein, at its rear side, the handle has fixed thereto a locking lug which projects through the aforesaid slot of the guard, the implement of which is in the inoperative positon, and engages a part of the inner sleeve to prevent same from being moved inwardly in relation to the outer sleeve.
Claim 13
Dependent Claim
47 words
A power tool according to claim 11 wherein the inner sleeve of each guard has a finger piece on its wall projecting outwardly through an elongated slot in the outer sleeve whereby the inner sleeve can be moved manually from its extended position to its retracted position.
Claim 14
Dependent Claim
65 words
A power tool according to claim 1 wherein two similar slots are provided on the underside of the body of the tool and the trigger has a part arranged so as to engage in one or other of the slots when the trigger is pressed to operate the motor, whereby relative movement between the body and the handle when the motor is driven is prevented.
Claim 15
Dependent Claim
82 words
A power tool according to claim 13 wherein each said slot has one side edge longer than the other and an open mouth through which said part of the trigger engages when it is pressed to operate the motor, and said part of the trigger being engaged also by the longer edge of the slot when it is in the released position so as to act as a stop defining the operative position of the body whichever work implement is in use.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |