Patent US4241795A successfully refreshed from Google Patents.
US4241795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand powered high impact tool
Assignee: Individual
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Filing: 1978-06-05
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Granted: 1980-12-30
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Expires: 1998-06-05
Abstract
Abstract An impact tool capable of use in place of a conventional jackhammer, the tool being of the type having an axially moving impact member guided telescopically by a mating guide member, and characterized by the following combination: (a) the impact member is a massive elongated rod, having a length of the order of two feet or greater, a diameter of the order of one inch or greater, and comprised of impact-resistant heavy material such as steel to have a weight of the order of 10 pounds; (b) the guide member is a rigid hollow outer sleeve, having a slidable fit over the massive rod and having a lower end formation of internal shape corresponding to the external shape of the shank of a jackhammer tool bit; (c) a restraint means retains the jackhammer tool bit with its shank inserted into the lower end formation of the guide; and (d) the massive rod and the guide member are cooperatively dimensioned so that the massive rod protrudes to enable a worker to alternately retract the massive rod and propel it against the end of the tool shank.
Inventors
- 👤 Ernest A. Landry, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:49
CPC Classifications
B; B25; B25D; B25D1/00; B25D1/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
341 words
A hand-powered tool for use with a conventional jackhammer tool bit to deliver high impact axial blows to said bit, said bit being of the type including a noncylindrical upper blow-receiving shank, a blow-transmitting working end, and an integral annular protrusion between said upper shank and said working end, said protrusion being spaced from the upper end of said bit by the axial length of said upper shank, said hand-powered tool comprising: an impact rod, said rod having a length of the order of two feet or greater and a diameter of the order of one inch or greater, said rod being comprised of impact-resistant heavy material such as steel to have a weight of the order of ten pounds, and said rod including a hand grippable upper end and a lower end shaped for impacting the upper end of said bit, a tubular guide member, said member including a bit guiding surface comprising a noncylindrical interior surface shaped to telescopically receive and thereby prevent rotation of said noncylindrical upper shank of said bit, said bit guiding surface extending upward from a lower end of said member by a length less than said length of said bit shank, so that when said bit is installed in the lower end of said member, with said bit protrusion resting against said lower end of said member, the shank protrudes above said bit guiding surface, a rod guiding surface comprising a cylindrical interior surface sized to telescopically receive said rod, said rod guiding surface extending downward from an upper end of said member and merging with said bit guiding surface and said rod guiding surface being shorter axially than said rod so that said hand grippable upper end protrudes from said guide member when said rod is installed and its lower end bears upon said bit, and restraint means for retaining said bit within said guide member, said restraint means including an element suitable for connection to the lower end of said guide member and to said bit at a location below said protrusion.
Claim 2
Dependent Claim
341 words
A hand-powered tool for use with a conventional jackhammer tool bit to deliver high impact axial blows to said bit, said bit being of the type including a noncylindrical upper blow-receiving shank, a blow-transmitting working end, and an integral annular protrusion between said upper shank and said working end, said protrusion being spaced from the upper end of said bit by the axial length of said upper shank, said hand-powered tool comprising: an impact rod, said rod having a length of the order of two feet or greater and a diameter of the order of one inch or greater, said rod being comprised of impact-resistant heavy material such as steel to have a weight of the order of ten pounds, and said rod including a hand grippable upper end and a lower end shaped for impacting the upper end of said bit, a tubular guide member, said member including a bit guiding surface comprising a noncylindrical interior surface shaped to telescopically receive and thereby prevent rotation of said noncylindrical upper shank of said bit, said bit guiding surface extending upward from a lower end of said member by a length less than said length of said bit shank, so that when said bit is installed in the lower end of said member, with said bit protrusion resting against said lower end of said member, the shank protrudes above said bit guiding surface, a rod guiding surface comprising a cylindrical interior surface sized to telescopically receive said rod, said rod guiding surface extending downward from an upper end of said member and merging with said bit guiding surface and said rod guiding surface being shorter axially than said rod so that said hand grippable upper end protrudes from said guide member when said rod is installed and its lower end bears upon said bit, and restraint means for retaining said bit within said guide member, said restraint means including an element suitable for connection to the lower end of said guide member and to said bit at a location below said protrusion.
Claim 3
Dependent Claim
36 words
The impact tool of claim 1 wherein said restraint means is elastic, enabling self-return of said tool bit to a fully seated position in said guide member upon termination of impact movement of said massive member.
Claim 4
Dependent Claim
40 words
The impact tool of claim 1 or 2 wherein said elastomeric element comprises a heavy duty elastic band member engaged upon a fitting carried by said guide member and adapted to be secured about a fitting on said tool bit.
Claim 5
Dependent Claim
56 words
The impact tool of claim 3 adapted for use with a conventional jackhammer tool bit which has a flange at the lower end of its mounting shank, said fitting on said guide member and the length of said heavy duty elastic band member cooperatively arranged to enable said band member to be secured about said flange.
Claim 6
Dependent Claim
16 words
The impact tool of claim 3 wherein said elastic band member comprises an elastomeric O ring.
Claim 7
Dependent Claim
283 words
An impact tool capable of use in place of a conventional jackhammer, said tool being of the type having an axially moving impact member guided telescopically by a mating guide member, and characterized by the following combination: (a) said impact member being an elongated rod, having a length of the order of two feet or greater, a diameter of the order of one inch or greater, a hand grippable upper end, and comprised of impact-resistant heavy material such as steel to have a weight of the order of 10 pounds; (b) said guide member being a rigid hollow sleeve, having a slideable fit with said elongated rod and having a lower end formation of internal shape corresponding to the external shape of the shank of a tool bit; (c) resilient restraint means to retain said tool bit with its shank inserted into said lower end formation, said restraint means comprising an elongated elastomeric element removably secured at one end to the exterior of said guide member and at its other end to the exterior of the tool bit, said element arranged to be elastically stretched during a blow of said elongated rod on said tool bit, and upon completion of said blow adapted to elastically retract said tool bit relative to said tubular member to its initial position, ready to receive a further blow; and (d) said elongated rod and said guide member cooperatively dimensioned so that when said rod bears upon the end of the shank of a retained tool, said rod protrudes beyond the upper end of said guide to be gripped to enable a worker to alternately retract said rod and propel it against the end of said tool shank.
Claim 8
Dependent Claim
283 words
An impact tool capable of use in place of a conventional jackhammer, said tool being of the type having an axially moving impact member guided telescopically by a mating guide member, and characterized by the following combination: (a) said impact member being an elongated rod, having a length of the order of two feet or greater, a diameter of the order of one inch or greater, a hand grippable upper end, and comprised of impact-resistant heavy material such as steel to have a weight of the order of 10 pounds; (b) said guide member being a rigid hollow sleeve, having a slideable fit with said elongated rod and having a lower end formation of internal shape corresponding to the external shape of the shank of a tool bit; (c) resilient restraint means to retain said tool bit with its shank inserted into said lower end formation, said restraint means comprising an elongated elastomeric element removably secured at one end to the exterior of said guide member and at its other end to the exterior of the tool bit, said element arranged to be elastically stretched during a blow of said elongated rod on said tool bit, and upon completion of said blow adapted to elastically retract said tool bit relative to said tubular member to its initial position, ready to receive a further blow; and (d) said elongated rod and said guide member cooperatively dimensioned so that when said rod bears upon the end of the shank of a retained tool, said rod protrudes beyond the upper end of said guide to be gripped to enable a worker to alternately retract said rod and propel it against the end of said tool shank.
Claim 9
Dependent Claim
31 words
The impact tool of claim 6 adapted for use with a standard jackhammer tool having a hexagonal cross-section wherein the lower end of said guide is formed into a hexagonal cross-section.
Claim 10
Dependent Claim
37 words
The impact tool according to claim 1 including locking means effective to lock said rod and guide member in telescopically closed position when not in use, and to limit outward movement of said rod when in use.
Claim 11
Dependent Claim
273 words
An impact tool capable of use in place of a conventional jackhammer, said tool being of the type having an axially moving impact member guided telescopically by a mating guide member, and characterized by the following combination: (a) said impact member being an elongated rod, having a length of the order of two feet or greater, a diameter of the order of one inch or greater, a hand grippable upper end, and comprised of impact-resistant heavy material such as steel to have a weight of the order of 10 pounds; (b) said guide member being a rigid hollow sleeve, having a slidable fit with said elongated rod and having a lower end formation of internal shape corresponding to the external shape of the shank of a jackhammer tool bit; (c) restraint means to retain said jackhammer tool bit with its shank inserted into said lower end formation; (d) said elongated rod and said guide member cooperatively dimensioned so that when said rod bears upon the end of the shank of a retained tool, said rod protrudes beyond the upper end of said guide to be gripped to enable a worker to alternately retract said rod and propel it against the end of said tool shank; and (e) stop means for preventing full retraction of said massive rod from said guide member comprising a spring detent follower located near the upper end of said guide member and riding upon the outer surface of said massive rod as it is withdrawn, said rod having a cooperating detent formation near its lower end into which said detent can fall to restrain further movement of said rod.
Claim 12
Dependent Claim
273 words
An impact tool capable of use in place of a conventional jackhammer, said tool being of the type having an axially moving impact member guided telescopically by a mating guide member, and characterized by the following combination: (a) said impact member being an elongated rod, having a length of the order of two feet or greater, a diameter of the order of one inch or greater, a hand grippable upper end, and comprised of impact-resistant heavy material such as steel to have a weight of the order of 10 pounds; (b) said guide member being a rigid hollow sleeve, having a slidable fit with said elongated rod and having a lower end formation of internal shape corresponding to the external shape of the shank of a jackhammer tool bit; (c) restraint means to retain said jackhammer tool bit with its shank inserted into said lower end formation; (d) said elongated rod and said guide member cooperatively dimensioned so that when said rod bears upon the end of the shank of a retained tool, said rod protrudes beyond the upper end of said guide to be gripped to enable a worker to alternately retract said rod and propel it against the end of said tool shank; and (e) stop means for preventing full retraction of said massive rod from said guide member comprising a spring detent follower located near the upper end of said guide member and riding upon the outer surface of said massive rod as it is withdrawn, said rod having a cooperating detent formation near its lower end into which said detent can fall to restrain further movement of said rod.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |