Patent US3584695A successfully refreshed from Google Patents.
US3584695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power tools
Assignee: GKN Screws and Fasteners Ltd
•
Filing: 1970-02-17
•
Granted: 1971-06-15
•
Expires: 1990-02-17
Abstract
Abstract The specification discloses a power hand tool, i.e. a tool arranged to be hand held but having a power-driven working element which is arranged to be operated by high-pressure gas produced by the explosion of an explosive charge. The tool includes control means arranged so that the working element can either be impacted and rotated or impacted only or rotated only. In one embodiment of the tool the order in which the working element can be impacted and rotated may be reversed. The preferred explosive charge is a liquid monofuel.
Inventors
- 👤 John Hilton Turnbull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:03
CPC Classifications
B; B25; B25B; B25B27/00; B25B27/0085; B25B21/00; B25B21/02; B25B21/023
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
143 words
A power tool comprising a body, a working element mounted on the body for reciprocation and rotation relative thereto, an impact member mounted in a first chamber in the body and operable to deliver impacts to the working element, a rotary drive member mounted in a second chamber in the body and operable to rotate the working element, receiving means in the body to receive an explosive charge which, when exploded, produces high-pressure gas in one of said chambers; open-ended passage means extending between said chambers; and a part on the member in said one chamber which normally covers the end of the passage means in said chamber but which uncovers said end when said member has been operated by the high-pressure gas to allow the latter to flow along the passage means to the other chamber to operate the member mounted therein.
Claim 2
Dependent Claim
143 words
A power tool comprising a body, a working element mounted on the body for reciprocation and rotation relative thereto, an impact member mounted in a first chamber in the body and operable to deliver impacts to the working element, a rotary drive member mounted in a second chamber in the body and operable to rotate the working element, receiving means in the body to receive an explosive charge which, when exploded, produces high-pressure gas in one of said chambers; open-ended passage means extending between said chambers; and a part on the member in said one chamber which normally covers the end of the passage means in said chamber but which uncovers said end when said member has been operated by the high-pressure gas to allow the latter to flow along the passage means to the other chamber to operate the member mounted therein.
Claim 3
Dependent Claim
23 words
A power tool according to claim 1 wherein said one chamber is said first chamber and said part is on the impact member.
Claim 4
Dependent Claim
73 words
A power tool according to claim 2 including control means selectively operable to any one of three settings in the first of which the working element is impacted and rotated by said gas and in the second and third of which the working element is respectively impacted only or rotated only by said gas, the control means including valve means in the passage means for controlling the flow of gas through the latter.
Claim 5
Dependent Claim
48 words
A power tool according to claim 3 including manually operable disabling means forming part of said control means and including a disabling element engageable with the working element in the third state of the control means to hold the working element out of engagement with the impact member.
Claim 6
Dependent Claim
36 words
A power tool according to claim 3 wherein in the second setting of the control means the valve means prevents the flow of gas through the passage means from the first chamber to the second chamber.
Claim 7
Dependent Claim
129 words
A power tool according to claim 5 wherein the passage means comprises first, second and third passages all communicating with the valve means, the first and second passages having open ends in the first chamber, said end of the first passage being always uncovered and said end of the second passage being uncovered by said part, the third passage having an open end in the second chamber and wherein in the first setting of the control means the valve means seals the first passage and allows communication between the second and third passages, in the second setting of the control means the valve means seals off the third passage, and in the third setting of the control means the valve means allows communication between the first and third passages.
Claim 8
Dependent Claim
73 words
A power tool according to claim 3 wherein the control means has a fourth setting in which the valve means allows the gas to flow to the second chamber simultaneously with its production in the first chamber and including auxiliary control means operable in said fourth setting to prevent the impact member engaging the working element under the influence of said gas until the latter has been rotated by the rotary drive member.
Claim 9
Dependent Claim
74 words
A power tool according to claim 2 inclUding detent means releaseably to hold the impact member against the action of a spring means in a cocked position, release of the detent means allowing movement of the impact member under the influence of the spring to initiate the explosion of a charge in said receiving means, the resulting high-pressure gas causing the impact member to compress the spring means and return to its cocked position.
Claim 10
Dependent Claim
30 words
A power tool according to claim 8 wherein the detent means is spring-loaded and is rendered inoperative by an end load applied to the impact member by the working element.
Claim 11
Dependent Claim
39 words
A power tool according to claim 9 including manually operable disabling means including a disabling element engageable with the working element to prevent the latter applying said end load to the impact member unless the safety means are operated.
Claim 12
Dependent Claim
29 words
A power tool according to claim 8 wherein the detent means is spring loaded to an operative position and manual release means is provided for releasing the detent means.
Claim 13
Dependent Claim
36 words
A power tool according to claim 8 wherein the receiving means is arranged to receive a charge of a liquid monofuel, the impact member carrying means for initiating decomposition of said fuel to produce said explosion.
Claim 14
Dependent Claim
29 words
A power tool according to claim 12 wherein said receiving means comprises a breech and said means for initiating decomposition comprises a firing pin capable of entering the breech.
Claim 15
Dependent Claim
29 words
A power tool a according to claim 1 for use in inserting a self-tapping or -piercing screw in a workpiece and wherein the working element comprises a screwdriver bit.
Claim 16
Dependent Claim
21 words
A power tool according to claim 7 for use in running nuts and wherein the working element is a nut-engaging member.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |