US3565183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impact tool
Assignee: Individual
•
Filing: 1968-12-13
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Granted: 1971-02-23
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Expires: 1988-12-13
Abstract
Abstract An impact tool for loosening and breaking homogeneous material such as compacted or frozen earth, black top and concrete. The tool is adapted to be mounted on the boom of a backhoe or the like, and it is powered by the hydraulic system of the apparatus on which it is mounted or by a separate system. A tool element, such as a hardened point, in integral with or mounted on an anvil arranged for limited longitudinal movement in a housing. A hammer coacting with the anvil is energized by a spring, preferably a pneumatic spring. A hydraulic cylinder moves the hammer against the spring, and when the spring is compressed in desired amount, the piston rod of the cylinder is cammed away from the hammer, thereby permitting the spring to drive the hammer with great force against the anvil. The tool is arranged so that operation thereof occurs only when the tool element or point is positioned against the work and the movable anvil has an inward relation with its housing, thereby providing a ''''dead man'''' control feature. In basic form the tool has a single hammer and a single cylinder. Modifications of the basic tool contemplate a double cylinder, single hammer device which increases the frequency of operation by a factor of two, and a double cylinder, double hammer device which in effect is the combination of two single hammer, single cylinder devices in a single tool.
Inventors
- 👤 Murray L Jayne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:34
CPC Classifications
E; E01; E01C; E01C23/00; E01C23/06; E01C23/12; E01C23/122; E01C23/124; B; B25; B25D; B25D9/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
204 words
An impact tool comprising: a frame including an elongated housing open at the ends; an anvil within and protruding from one end of said housing, said anvil longitudinally movable within said housing and having a tool element the end thereof exterior of said housing; means between said housing and anvil limiting longitudinal movement of said anvil; a hammer within said housing, said hammer longitudinally movable and adapted to deliver a striking blow to said anvil, said hammer having a pusher part; cam means on said frame in effective relation with said pusher part; spring means on said frame in effective relation with said hammer; a cylinder pivoted to said frame; a piston in said cylinder, said piston having pusher means adapted to engage said pusher part to retract said hammer against said spring means and to engage said cam means, whereby said pusher means disengages said pusher part when said spring means is compressed, thereby permitting said spring means to move said hammer rapidly against said anvil; and means moving said piston outwardly and inwardly of said cylinder, said impact tool in operative condition when said tool element engages a work surface and said anvil is positioned inwardly of its outermost limit of movement.
Claim 2
Dependent Claim
204 words
An impact tool comprising: a frame including an elongated housing open at the ends; an anvil within and protruding from one end of said housing, said anvil longitudinally movable within said housing and having a tool element the end thereof exterior of said housing; means between said housing and anvil limiting longitudinal movement of said anvil; a hammer within said housing, said hammer longitudinally movable and adapted to deliver a striking blow to said anvil, said hammer having a pusher part; cam means on said frame in effective relation with said pusher part; spring means on said frame in effective relation with said hammer; a cylinder pivoted to said frame; a piston in said cylinder, said piston having pusher means adapted to engage said pusher part to retract said hammer against said spring means and to engage said cam means, whereby said pusher means disengages said pusher part when said spring means is compressed, thereby permitting said spring means to move said hammer rapidly against said anvil; and means moving said piston outwardly and inwardly of said cylinder, said impact tool in operative condition when said tool element engages a work surface and said anvil is positioned inwardly of its outermost limit of movement.
Claim 3
Dependent Claim
38 words
The combination of claim 1 with the addition of resilient means urging the free end of said cylinder toward said housing, whereby said pusher means when said piston is retracted is in position to engage said pusher part.
Claim 4
Dependent Claim
28 words
The combination of claim 1 with the addition of aligned recoil parts on said hammer and said frame, and a resilient recoil bumper on one of said parts.
Claim 5
Dependent Claim
34 words
The combination of claim 1 with the addition of a resilient bumper on said frame in position to be engaged by said pusher means when the latter is cammed away from said pusher part.
Claim 6
Dependent Claim
15 words
The combination of claim 1 wherein said spring means comprises at least one air spring.
Claim 7
Dependent Claim
20 words
The combination of claim 1 wherein said pusher part on said hammer extends laterally through an opening in said housing.
Claim 8
Dependent Claim
25 words
The combination of claim 1 wherein said pusher means on said piston comprises a roller means for engaging said pusher part and said cam means.
Claim 9
Dependent Claim
82 words
The combination of claim 1 wherein said pusher part on said hammer extends laterally through an opening in said housing and said cam means comprises a pair of plates mounted one on each side of said housing opening, the outer edges of said plates tapering outwardly from bottom to top, and said pusher means on said piston comprises three side-by-side rollers, the center roller engaging said pusher part of said hammer and the outer rollers engaging the tapering edges of said plates.
Claim 10
Dependent Claim
28 words
The combination of claim 1 wherein said means moving said piston includes a valve on said frame and a mechanical linkage interconnecting said pivoted cylinder and said valve.
Claim 11
Dependent Claim
81 words
The combination of claim 1 wherein said hammer has a second pusher part and said frame has a second inclined cam means in effective relation with said second pusher part, and with the addition of a second cylinder pivoted to said frame, a piston in said second cylinder having pusher means adapted to engage said second pusher part and means moving said piston of said second cylinder outwardly and inwardly as said piston of the first cylinder moves inwardly and outwardly.
Claim 12
Dependent Claim
46 words
The combination of claim 10 with the addition of keeper plates on said frame positioned to prevent said pusher means of said pistons from engaging said pusher parts of said hammer until after said pistons are fully retracted and said hammer has bottomed on said anvil.
Claim 13
Dependent Claim
99 words
The combination of claim 1 with the addition of a second hammer in said housing in side-by-side relation with the first hammer, said second hammer having a pusher part, a second spring means in said frame in alignment with said second hammer, a second cylinder pivoted to said frame, a piston in said second cylinder having pusher means coacting with said pusher part of said second hammer, and means moving said piston of said second hammer, and means moving said piston of said second cylinder outwardly and inwardly as said piston of the first cylinder moves inwardly and outwardly.
Claim 14
Dependent Claim
219 words
An impact tool comprising: a frame including an elongated housing open at the ends; an anvil within and protruding from one end of said housing, said anvil longitudinally movable within said housing and having a tool element at the end thereof exterior of said housing; means between said housing and anvil limiting longitudinal movement of said anvil; a hammer within said housing, said hammer longitudinally movable and adapted to deliver a striking blow to said anvil, said hammer having a laterally extending integral pusher part; cam means on said frame in effective relation with said pusher part; spring means on said frame in effective relation with said hammer; and power means on said frame having a pivoted pusher means adapted to engage in driving manner said pusher part and move said hammer against and thereby compress said spring means, said pusher means also adapted to engage said cam means and thereby become disengaged from said pusher part, whereby said compressed spring means moves said hammer rapidly against said anvil; and said impact tool in operative condition when said tool element engages a work surface and said anvil and hammer are positioned inwardly of their outermost limits of movement so said pusher means of said power means is able to engage said pusher part of said hammer in driving manner.
Claim 15
Dependent Claim
219 words
An impact tool comprising: a frame including an elongated housing open at the ends; an anvil within and protruding from one end of said housing, said anvil longitudinally movable within said housing and having a tool element at the end thereof exterior of said housing; means between said housing and anvil limiting longitudinal movement of said anvil; a hammer within said housing, said hammer longitudinally movable and adapted to deliver a striking blow to said anvil, said hammer having a laterally extending integral pusher part; cam means on said frame in effective relation with said pusher part; spring means on said frame in effective relation with said hammer; and power means on said frame having a pivoted pusher means adapted to engage in driving manner said pusher part and move said hammer against and thereby compress said spring means, said pusher means also adapted to engage said cam means and thereby become disengaged from said pusher part, whereby said compressed spring means moves said hammer rapidly against said anvil; and said impact tool in operative condition when said tool element engages a work surface and said anvil and hammer are positioned inwardly of their outermost limits of movement so said pusher means of said power means is able to engage said pusher part of said hammer in driving manner.
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |