US3566977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion hammer
Assignee: Vulcan Iron Works Inc
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Filing: 1969-08-01
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Granted: 1971-03-02
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Expires: 1989-08-01
Abstract
Abstract There is provided a percussion hammer of the type including a cylinder and a piston operable in the cylinder connected to a ram through a piston rod. Valve means are provided for cycling working fluid into and exhausting the working fluid from the cylinder to cycle the tool through power and return strokes. The cycling valve is controlled by a suitable actuator or slide bar connected to the ram and provided with cams for actuating a trip. The ram is provided with removable weights so as to permit alteration of the operating characteristics of the hammer. In addition there is provided an improved means of fastening the piston rod to the ram and of connecting the slide bar to the ram. A detent is provided for latching the valve trip in the desired position.
Inventors
- 👤 George C Wandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:25
CPC Classifications
E; E02; E02D; E02D7/00; E02D7/02; E02D7/06; E02D7/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
213 words
A percussion hammer of the type including: a cylinder; a piston operable in said cylinder; a ram assembly provided with cavity means adapted to receive removable weights, said ram assembly having a centrally located piston rod bore for receiving one end of a piston rod; removable weight means in said cavity means; a piston rod connected to said piston and having one end extending into said bore, said one end having enlarged annular means; a split bushing secured over said enlarged annular means; a split piston-rod-retaining gland extending into said bore retaining said bushing; means securing said retaining gland in said bore; said bore being provided with a counterbore for securing a slide bar; valve means for cycling working fluid into said cylinder, said valve means including a valve chamber and a multiposition valve element movable in said chamber; a slide bar operatively positioned to control said valve means having a lower and fitting into said counterbore and a flexible connecter, one end of which is connected to the lower end of said slide bar and extending through said counterbore, said flexible connecter being secured within said counterbore; and detent means retaining said valve element in one of its positions until actuation thereof by said slide bar to the other of its positions.
Claim 2
Dependent Claim
213 words
A percussion hammer of the type including: a cylinder; a piston operable in said cylinder; a ram assembly provided with cavity means adapted to receive removable weights, said ram assembly having a centrally located piston rod bore for receiving one end of a piston rod; removable weight means in said cavity means; a piston rod connected to said piston and having one end extending into said bore, said one end having enlarged annular means; a split bushing secured over said enlarged annular means; a split piston-rod-retaining gland extending into said bore retaining said bushing; means securing said retaining gland in said bore; said bore being provided with a counterbore for securing a slide bar; valve means for cycling working fluid into said cylinder, said valve means including a valve chamber and a multiposition valve element movable in said chamber; a slide bar operatively positioned to control said valve means having a lower and fitting into said counterbore and a flexible connecter, one end of which is connected to the lower end of said slide bar and extending through said counterbore, said flexible connecter being secured within said counterbore; and detent means retaining said valve element in one of its positions until actuation thereof by said slide bar to the other of its positions.
Claim 3
Dependent Claim
201 words
A percussion hammer of the type including: a cylinder; a piston operable in said cylinder; a ram assembly having a centrally located piston rod bore for receiving one end of a piston rod, said bore being provided with an annular, enlarged portion intermediate its ends; a piston rod connected to said piston and having one end extending into said bore, said one end having a plurality of enlarged annular portions, and having an outwardly and downwardly tapered surface; a split sleeve engaging a portion of said one end and fitted within said bore; a pair of split wedge rings adapted to wedge within said annular enlarged portion; a split piston-rod-retaining gland extending into said bore around said rod and including a spaced complementary outwardly and downwardly extending chamfer converging said outwardly and downwardly tapered surface, said gland including a tapered surface engageable with one of said retaining rings wedging said ring outwardly; means securing said retaining gland in said bore; valve means for cycling working fluid into said cylinder; and actuating means operatively connecting said valve means and said ram to control the sequence of fluid flow into and out of said cylinder providing for repetitively cycling said piston and ram.
Claim 4
Dependent Claim
201 words
A percussion hammer of the type including: a cylinder; a piston operable in said cylinder; a ram assembly having a centrally located piston rod bore for receiving one end of a piston rod, said bore being provided with an annular, enlarged portion intermediate its ends; a piston rod connected to said piston and having one end extending into said bore, said one end having a plurality of enlarged annular portions, and having an outwardly and downwardly tapered surface; a split sleeve engaging a portion of said one end and fitted within said bore; a pair of split wedge rings adapted to wedge within said annular enlarged portion; a split piston-rod-retaining gland extending into said bore around said rod and including a spaced complementary outwardly and downwardly extending chamfer converging said outwardly and downwardly tapered surface, said gland including a tapered surface engageable with one of said retaining rings wedging said ring outwardly; means securing said retaining gland in said bore; valve means for cycling working fluid into said cylinder; and actuating means operatively connecting said valve means and said ram to control the sequence of fluid flow into and out of said cylinder providing for repetitively cycling said piston and ram.
Claim 5
Dependent Claim
95 words
A percussion hammer As set forth in claim 2 wherein the lower one of said retaining rings is of generally angular cross section, having an upper surface inclined upwardly and outwardly the upper one of said retaining rings having a lower surface complementary to said upper surface tapering upwardly and outwardly, said upper ring also having an inner surface tapering inwardly and downwardly and in engagement with an inwardly and downwardly tapering outer surface of said gland whereby said gland wedges said upper ring outwardly to wedge said retaining rings within said enlarged annular portion.
Claim 6
Dependent Claim
37 words
A percussion hammer as set forth in claim 2 including: a ram point extending from the other end of said bore; and a ram cushion between the lower end of said piston rod and said ram point.
Claim 7
Dependent Claim
128 words
A percussion hammer of the type including: a cylinder; a piston operable in said cylinder; a ram assembly provided with a through counterbore for securing a slide bar; a piston rod interconnecting said piston and said ram assembly; a valve means for cycling working fluid into said cylinder; a slide bar operatively positioned to actuate said valve means to control the sequence of fluid flow into and out of said cylinder to provide for said repetitive cycling of said piston and ram, said slide bar having a lower cylindrical portion fitting into said counterbore; a flexible connecter having one end connected to the lower end of said slide bar and extending through said counterbore; and means adjustably securing the other end of said flexible connecter in said counterbore.
Claim 8
Dependent Claim
128 words
A percussion hammer of the type including: a cylinder; a piston operable in said cylinder; a ram assembly provided with a through counterbore for securing a slide bar; a piston rod interconnecting said piston and said ram assembly; a valve means for cycling working fluid into said cylinder; a slide bar operatively positioned to actuate said valve means to control the sequence of fluid flow into and out of said cylinder to provide for said repetitive cycling of said piston and ram, said slide bar having a lower cylindrical portion fitting into said counterbore; a flexible connecter having one end connected to the lower end of said slide bar and extending through said counterbore; and means adjustably securing the other end of said flexible connecter in said counterbore.
Claim 9
Dependent Claim
56 words
A percussion hammer as set forth in claim 5 wherein said flexible connecter includes a length of flexible rope having threaded fittings at each end, one of said fittings being threaded into the lower end of said slide bar, the other of said fittings extending through said counterbore and locked therethrough by the last mentioned means.
Claim 10
Dependent Claim
162 words
A percussion hammer of the type including: a cylinder; a piston operable in said cylinder; a ram assembly; a piston rod interconnecting said piston and said ram; valve means for cycling working fluid into said cylinder, said valve means including a valve chamber and a multiposition valve element movable within said chamber; cam means for moving said valve element to a first position when said piston is near the bottom of its stroke to supply pressurized fluid in said cylinder to raise said piston and to a second position when said piston is near the top of its stroke to exhaust the working fluid from below said piston; a slide bar operatively connected to said ram responsive to the position of said piston for moving said valve element between said positions; and detent means retaining said valve element and said cam means in a desired one of said positions until actuation thereof to the other of its positions by said slide bar.
Claim 11
Dependent Claim
162 words
A percussion hammer of the type including: a cylinder; a piston operable in said cylinder; a ram assembly; a piston rod interconnecting said piston and said ram; valve means for cycling working fluid into said cylinder, said valve means including a valve chamber and a multiposition valve element movable within said chamber; cam means for moving said valve element to a first position when said piston is near the bottom of its stroke to supply pressurized fluid in said cylinder to raise said piston and to a second position when said piston is near the top of its stroke to exhaust the working fluid from below said piston; a slide bar operatively connected to said ram responsive to the position of said piston for moving said valve element between said positions; and detent means retaining said valve element and said cam means in a desired one of said positions until actuation thereof to the other of its positions by said slide bar.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |