US3595133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer for producing mechanical oscillations
Assignee: NAT RES DEV
•
Filing: 1969-07-01
•
Granted: 1971-07-27
•
Expires: 1989-07-01
Abstract
Abstract A transducer for converting fluid pressure oscillations into mechanical oscillations usable as a rock breaking tool comprises a differential area piston sliding in a cylinder having two chambers therein. One chamber is connected to the oscillating pressure fluid source, and a valve arrangement including a fluid storage space ensures that the pressure in the storage space is greater than the algebraic mean pressure in the first chamber. A position control valve prevents slow drift or rapid excessive movements of the piston.
Inventors
- 👤 Keith Foster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:51
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/18; B06B1/183; B25; B25D; B25D9/00; B25D9/06; Y; Y10; Y10S; Y10S173/00; Y10S173/04
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
180 words
A transducer for converting fluid pressure oscillations into mechanical oscillations comprising a piston member having first and second opposing faces and a cylinder member mounted for relative oscillatory movement, the said first and second opposing faces of the piston member respectively bounding first and secOnd chambers in the cylinder member, means to connect at least the first chamber to a respective source of oscillating pressure fluid to cause said relative oscillatory movement, a valve assembly within the cylinder member, the valve assembly comprising a storage space, a flow regulator valve connecting the first chamber to the storage space, means to bias the regulator valve to maintain the fluid pressure in the storage space greater than the algebraic mean pressure in the first chamber, and a position control valve within the cylinder member and engageable by the piston member, the position control valve being adapted upon relative movement in one sense in excess of a predetermined amount, to cause the storage space to be connected to the second chamber, to oppose the said relative movement in excess of a predetermined amount.
Claim 2
Dependent Claim
180 words
A transducer for converting fluid pressure oscillations into mechanical oscillations comprising a piston member having first and second opposing faces and a cylinder member mounted for relative oscillatory movement, the said first and second opposing faces of the piston member respectively bounding first and secOnd chambers in the cylinder member, means to connect at least the first chamber to a respective source of oscillating pressure fluid to cause said relative oscillatory movement, a valve assembly within the cylinder member, the valve assembly comprising a storage space, a flow regulator valve connecting the first chamber to the storage space, means to bias the regulator valve to maintain the fluid pressure in the storage space greater than the algebraic mean pressure in the first chamber, and a position control valve within the cylinder member and engageable by the piston member, the position control valve being adapted upon relative movement in one sense in excess of a predetermined amount, to cause the storage space to be connected to the second chamber, to oppose the said relative movement in excess of a predetermined amount.
Claim 3
Dependent Claim
31 words
A transducer as claimed in claim 1 wherein the position control valve is adapted upon further relative movement in said one sense to connect the second chamber to the first chamber.
Claim 4
Dependent Claim
32 words
A transducer as claimed in claim 2 wherein the position control valve is adapted to connect the second chamber to the first chamber via the storage space, bypassing the flow regulator valve.
Claim 5
Dependent Claim
101 words
A transducer as claimed in claim 3 wherein there are two ports, and the position control valve is adapted to be moved axially when engaged by the piston member, and has an axially extending surface provided with two axially spaced lands including a first land cooperating with a first port to connect the storage chamber to the second chamber upon said relative movement in excess of a predetermined amount, a second land cooperating with a second port to connect the storage space to the first chamber upon said further relative movement, whilst the second chamber is connected to the storage space.
Claim 6
Dependent Claim
20 words
A transducer as claimed in claim 4 wherein the said surface of the position control valve bounds the storage space.
Claim 7
Dependent Claim
22 words
A transducer as claimed in claim 4 wherein a spring is provided to oppose said axial movement of the position control valve.
Claim 8
Dependent Claim
30 words
A transducer as claimed in claim 2 wherein the position control valve is adapted, upon said further relative movement, to connect the first chamber to a relatively low pressure port.
Claim 9
Dependent Claim
24 words
A transducer as claimed in claim 4 wherein the position control valve has a third land which cooperates with the relatively low pressure port.
Claim 10
Dependent Claim
42 words
A transducer as claimed in claim 1 wherein at least two axially spaced-apart bearings are provided slidably to support the piston member in the cylinder member, a said bearing permitting the piston member freedom of movement to accommodate malalignment between said bearings.
Claim 11
Dependent Claim
37 words
A transducer as claimed in claim 9 wherein said bearing comprises an annular bearing pad in which the piston member is supported, and which has limited freedom of movement radially of the axis of the piston member.
Claim 12
Dependent Claim
47 words
A transducer as claimed in claim 9 wherein the said bearing supports one end of the piston member, the piston member being hollow at said end, the said bearing comprising a spigot which slidably engages said hollow end, the spigot being universally mounted from the cylinder member.
Claim 13
Dependent Claim
31 words
A transducer as claimed in claim 1 wherein there is provided a shock absorber device, the piston member consisting of at least two portions connected together by said shock absorbing device.
Claim 14
Dependent Claim
15 words
A transducer as claimed in claim 12 wherein the shock absorbing device comprises a dashpot.
Claim 15
Dependent Claim
28 words
A transducer as claimed in claim 12 wherein the piston member comprises two relatively movable coaxial elements, one inside the other, connected together by the shock absorbing device.
Claim 16
Dependent Claim
52 words
A transducer as claimed in claim 13 wherein the dashpot is defined by an axially extending cavity formed in the inner piston element which is adapted to contain pressure fluid, there being a plunger carried by the outer piston element which plunger is disposed in said cavity for damped axial movement therein.
Claim 17
Dependent Claim
34 words
A transducer as claimed In claim 1 wherein a vibration damping device connects a portion of the cylinder member with the remainder thereof, the said portion slidably supporting an end of the piston member.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |