Patent US3552501A successfully refreshed from Google Patents.
US3552501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for breaking pavement and the like
Assignee: Individual
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Filing: 1969-06-30
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Granted: 1971-01-05
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Expires: 1989-06-30
Abstract
Abstract An impact tool to be mounted upon an implement, for breaking pavements and similar material. It comprises a hammer that is retracted against an ''''air spring'''' or similar means by a hydraulic cylinder to store energy in the spring. Means is provided to release the hammer so retracted, and permitting it to make impact with a chisel or point resting on the material to be broken. This tool can be positioned for operation in a horizontal, as well as in a vertical position.
Inventors
- 👤 John B Weiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:53
CPC Classifications
E; E01; E01C; E01C23/00; E01C23/06; E01C23/12; E01C23/122; E01C23/124
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
311 words
A device for breaking pavement material and the like, comprising, in combination a frame having an upright portion comprising a tubular passageway defined by a front wall, said wall having an opening therein, a hammer having an upper and a lower end, and slidable in said passageway, a point slidable in said passageway and engaged by said lower end of said hammer, means to limit the travel of said point in said passageway, spaced upright members secured to said frame, a support member secured to said frame and normal to said passageway and spaced upwardly from said upper end, an impact energy-producing means intermediate said upper end and said support member, a hydraulic cylinder intermediate said spaced upright members, and having fluid connections, a pivot means in said members and normal thereto, for the upper end of said cylinder and spaced forwardly from said front wall, means to urge said cylinder pivotally toward said front wall, a cam block secured to said hammer and positioned in said opening and having a downwardly-directed face extending forwardly relative with respect to said hammer, said cylinder having a ram, the axis of which is directed convergently downward toward said hammer, said ram terminating in a roller cage embracing said cam block, a cam roller positioned in said cage to engage said lower face adjacent said hammer when said ram is extended downwardly, means associated with said cylinder and said front wall to effect translation of said roller forwardly along said lower face during retraction of said ram into said cylinder thereby raising said hammer and storing energy in said energy-producing means, continued retraction of said ram resulting in disengagement of said roller from said cam block, permitting release of said energy-producing means to expend said energy and force said hammer into engagement with said point, and a hydraulic system connected to said fluid connections.
Claim 2
Independent Claim
311 words
A device for breaking pavement material and the like, comprising, in combination a frame having an upright portion comprising a tubular passageway defined by a front wall, said wall having an opening therein, a hammer having an upper and a lower end, and slidable in said passageway, a point slidable in said passageway and engaged by said lower end of said hammer, means to limit the travel of said point in said passageway, spaced upright members secured to said frame, a support member secured to said frame and normal to said passageway and spaced upwardly from said upper end, an impact energy-producing means intermediate said upper end and said support member, a hydraulic cylinder intermediate said spaced upright members, and having fluid connections, a pivot means in said members and normal thereto, for the upper end of said cylinder and spaced forwardly from said front wall, means to urge said cylinder pivotally toward said front wall, a cam block secured to said hammer and positioned in said opening and having a downwardly-directed face extending forwardly relative with respect to said hammer, said cylinder having a ram, the axis of which is directed convergently downward toward said hammer, said ram terminating in a roller cage embracing said cam block, a cam roller positioned in said cage to engage said lower face adjacent said hammer when said ram is extended downwardly, means associated with said cylinder and said front wall to effect translation of said roller forwardly along said lower face during retraction of said ram into said cylinder thereby raising said hammer and storing energy in said energy-producing means, continued retraction of said ram resulting in disengagement of said roller from said cam block, permitting release of said energy-producing means to expend said energy and force said hammer into engagement with said point, and a hydraulic system connected to said fluid connections.
Claim 3
Dependent Claim
32 words
A device as set forth in claim 1, in which said downwardly-directed face of said cam block terminates forwardly in a raised bead portion directed parallel to the axis of said roller.
Claim 4
Dependent Claim
18 words
A device as set forth in claim 1, in which said passageway is of a rectangular cross section.
Claim 5
Dependent Claim
18 words
A device as set forth in claim 1, in which said impact energy-producing means comprises a pneumatic spring.
References Cited (Backward Citations)
US3358779A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |