US3908767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Percussion tool
Assignee: ING GUNTER KLEMM SPEZIALUNTERNEHMEN fur BOHRTECHNIK OF DROLSHAGEN
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Filing: 1974-09-04
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Granted: 1975-09-30
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Expires: 1994-09-04
Abstract
Abstract This disclosure relates to a percussion tool which includes a housing having a chamber reciprocally mounting a piston with first and second pressure ducts at opposite ends of the latter and a control duct therebetween as well as a return duct in fluid communication with the chamber at a point intermediate the points of entry of the first and second pressure ducts, the improvement includes movable valve means in the form of an annular open ended valve sleeve operative for alternately placing the inlet and pressure ducts in fluid communication in a first position and placing the first pressure and return ducts in fluid communication in a second position while at the same time maintaining fluid communication between the inlet and second pressure ducts and closing communication between the inlet and first pressure ducts. The valve sleeve includes both an annular collar and a circumferential groove associated with selected ones of the latter-mentioned ducts for imparting the reciprocal motion to the valve sleeve.
Inventors
- 👤 Guenter Klemm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:31
CPC Classifications
F; F01; F01L; F01L25/00; F01L25/02; F01L25/04; F01L25/06; B; B06; B06B; B06B1/00; B06B1/18; B06B1/183; B25; B25D; B25D9/00; B25D9/14; B25D9/145; B25D9/16; B25D9/20; B25D9/26; F01L21/00; F01L21/02; F03; F03C; F03C1/00; F03C1/007; B25D2209/00; B25D2209/002; B25D2209/007
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
240 words
A percussion tool comprising a housing defining a chamber within which is reciprocally mounted a piston, first and second pressure ducts in fluid communication with said chamber at respective first and second sides thereof, a control duct in fluid communication with said chamber at said second side of said piston, a return duct in fluid communication with said chamber at a point intermediate the points of entry of said first and second pressure ducts relative to said chamber, an inlet duct for delivering a pressurized fluid to said pressure ducts, and movable valve means for alternately placing said inlet and pressure ducts in fluid communication in a first position of said valve means and placing said first pressure and return ducts in fluid communication in a second position of said valve means while at the same time maintaining fluid communication between said inlet and second pressure ducts and closing communication between said inlet and first pressure ducts, said valve means being an annular open ended valve sleeve mounted for reciprocal motion in a bore, said first and second pressure ducts open into said bore at axially opposite ends thereof, said return duct opens into said bore between the points of entry of said first and second pressure ducts relative to said bore, and said valve sleeve has first means on an outer peripheral surface thereof for placing said first pressure and return ducts in fluid communication in said second position.
Claim 2
Dependent Claim
240 words
A percussion tool comprising a housing defining a chamber within which is reciprocally mounted a piston, first and second pressure ducts in fluid communication with said chamber at respective first and second sides thereof, a control duct in fluid communication with said chamber at said second side of said piston, a return duct in fluid communication with said chamber at a point intermediate the points of entry of said first and second pressure ducts relative to said chamber, an inlet duct for delivering a pressurized fluid to said pressure ducts, and movable valve means for alternately placing said inlet and pressure ducts in fluid communication in a first position of said valve means and placing said first pressure and return ducts in fluid communication in a second position of said valve means while at the same time maintaining fluid communication between said inlet and second pressure ducts and closing communication between said inlet and first pressure ducts, said valve means being an annular open ended valve sleeve mounted for reciprocal motion in a bore, said first and second pressure ducts open into said bore at axially opposite ends thereof, said return duct opens into said bore between the points of entry of said first and second pressure ducts relative to said bore, and said valve sleeve has first means on an outer peripheral surface thereof for placing said first pressure and return ducts in fluid communication in said second position.
Claim 3
Dependent Claim
55 words
The percussion tool as defined in claim 1 wherein said valve sleeve has second means on its outer peripheral surface for moving said valve sleeve from its first to its second position under the impingement of fluid thereagainst, and said control duct opens into said bore for so impinging fluid pressure upon said second means.
Claim 4
Dependent Claim
80 words
The percussion tool as defined in claim 1 wherein said valve means has an annular collar on its outer peripheral surface, said collar includes oppositely facing annular surfaces, said control ducT opens into said bore for impinging pressurized fluid upon a first of said faces, a duct for placing said bore adjacent a second of said faces in fluid communication with said return duct, and the area of said first face is greater than the area of said second face.
Claim 5
Dependent Claim
23 words
The percussion tool as defined in claim 1 including spring means normally biasing said valve sleeve in a direction toward said second position.
Claim 6
Dependent Claim
26 words
The percussion tool as defined in claim 1 wherein said first means is a radially outwardly opening circumferential groove in said valve sleeve outer peripheral surface.
Claim 7
Dependent Claim
159 words
The percussion tool as defined in claim 1 wherein said valve means has an annular collar on its outer peripheral surface, said collar includes oppositely facing annular surfaces, said control duct opens into said bore for impinging pressurized fluid upon a first of said faces, a duct for placing said bore adjacent a second of said faces in fluid communication with said return duct, the area of said first face is greater than the area of said second face, said valve sleeve includes an annular terminal end force at an axial end of said valve sleeve disposed adjacent said second pressure duct, said bore includes an annular seat against which abutts said terminal end face in said first position, and a plurality of grooves in said terminal end face whereby fluid pressure acting between said grooves and annular seat apply a force acting in a direction tending to move said valve sleeve from said first to said second position.
Claim 8
Dependent Claim
55 words
The percussion tool as defined in claim 1 wherein said piston has a pair of annular axially oppositely facing surfaces of differing surface areas, a larger of said annular surfaces being in fluid communication with said first pressure duct, and a smaller of said annular surfaces being in fluid communication with said second pressure duct.
Claim 9
Dependent Claim
57 words
The percussion tool as defined in claim 1 wherein said control duct enters said chamber in the area of said first pressure duct and more remote from said second pressure duct, adjustable throttle means for adjusting the rate of flow from said chamber through said control duct, and said control duct being connected to said return duct.
Claim 10
Dependent Claim
93 words
The percussion tool as defined in claim 1 wherein said control duct includes a plurality of branch ducts entering said chamber along axially spaced points in the area of said first pressure duct and more remote from said second pressure duct, the throw of said piston being sufficient to completely cover all of said branch ducts and progressively open the same, adjustable throttle means for adjusting the rate of flow from said chamber through said control duct branches, and said control duct remote from the branches thereof being connected to said return duct.
Claim 11
Dependent Claim
37 words
The percussion tool as defined in claim 1 including a bore in said piston, a flusing pipe disposed in said bore and being attached to said cylinder, and an annular gap between said bore and flashing pipe.
Claim 12
Dependent Claim
74 words
The percussion tool as defined in claim 1 including a control valve between said inlet and second pressure ducts, an accumulator, an accumulator duct leading from said accumulator to a bore housing said control valve, and said control valve being movable from a first position at which said inlet, second pressure and accumulator ducts are in fluid communication with each other to a second position at which fluid communication between accululator and pressure ducts.
Claim 13
Dependent Claim
97 words
The percussion tool as defined in claim 1 including a control valve between said inlet and second pressure ducts, an accumulator, an accumulator duct leading from said accumulator to a bore housing said control valve, said control valve being movable from a first position at which said inlet, second pressure and accumulator dicts are in fluid communication with each other to a second position at which fluid communication between the accumulator and pressure ducts, said control valve in a second annular open ended valve sleeve, and spring means biasing said secoNd valve sleeve toward its second position.
Claim 14
Dependent Claim
128 words
The percussion tool as defined in claim 1 including a control valve between said inlet and second pressure ducts, an accumulator, an accumulator duct leading from said accumulator to a bore housing said control valve, said control valve being movable from a first position at which said inlet, second pressure and accumulator ducts are in fluid communication with each other to a second position at which fluid communication between the accumulator and pressure ducts, said control valve in a second annular open ended valve sleeve, spring means biasing said second valve sleeve toward its second position, said second valve sleeve includes a terminal annular face more adjacent said accumulator and second pressure ducts than said inlet duct, and a plurality of grooves in said terminal annular end face.
Claim 15
Dependent Claim
80 words
The percussion tool as defined in claim 2 wherein said valve means has an annular collar on its outer peripheral surface, said collar includes oppositely facing annular surfaces, said control duct opens into said bore for impinging pressurized fluid upon a first of said faces, a duct for placing said bore adjacent a second of said faces in fluid communication with said return duct, and the area of said first face is greater than the area of said second face.
Claim 16
Dependent Claim
23 words
The percussion tool as defined in claim 2 including spring means normally biasing said valve sleeve in a direction toward said second position.
Claim 17
Dependent Claim
26 words
The percussion tool as defined in claim 2 wherein said first means is a radially outwardly opening circumferential groove in said valve sleeve outer peripheral surface.
Claim 18
Dependent Claim
55 words
The percussion tool as defined in claim 2 wherein said piston has a pair of annular axially oppositely facing surfaces of differing surface areas, a larger of said annular surfaces being in fluid communication with said first pressure duct, and a smaller of said annular surfaces being in fluid communication with said second pressure duct.
Claim 19
Dependent Claim
57 words
The percussion tool as defined in claim 2 wherein said control duct enters said chamber in the area of said first pressure duct and are remote from said second pressure duct, adjustable trottle means for adjusting the rate of flow from said chamber through said control duct, and said control duct being connected to said return duct.
Claim 20
Dependent Claim
93 words
The percussion tool as defined in claim 2 wherein said control duct includes a plurality of branch ducts entering said chamber along axially spaced points in the area of said first pressure duct and more remote from said second pressure duct, the throw of said piston being sufficient to completely cover all of said branch ducts and progressively open the same, adjustable throttle means for adjusting the rate of flow from said chamber through said control duct branches, and said control duct remote from the branches thereof being connected to said return duct.
Claim 21
Dependent Claim
57 words
The percussion tool as defined in claim 3 wherein said control duct enters said chamber in the area of said first pressure duct and more remote from said second pressure duct, adjustable trottle means for adjusting the rate of flow from said chamber through said control duct, and said control duct being connected to said return duct.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |