US3570609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acoustic impact device
Assignee: Hydroacoustics Inc
•
Filing: 1968-11-14
•
Granted: 1971-03-16
•
Expires: 1988-11-14
Abstract
Abstract An impact device is described which is suitable for use in a precussive tool and which utilizes a hammer that impacts an anvil to efficiently transmit force pulses to a load such as the earth formation. The anvil system includes an impact hammer, an elastic spring member, drill steel and a bit. The required load force and load deflection are caused by a single force pulse of the proper force amplitude and time duration. The impact device elements and the load itself each have a mechanical impedance analogue which can be represented in a mechanical circuit. The Q of this circuit is selected to be between about 0.7 to 1.5 with the result that the transmitted force pulses are readily absorbed by the load with a minimum of reflection, while impact spring stress levels and velocities are both held to reasonable values. A folded spring configuration is described which permits the application of the present invention to relatively small pneumatic air tool devices.
Inventors
- 👤 Boyd A Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:43
CPC Classifications
B; B25; B25D; B25D9/00; B25D9/06; B25D9/12; B25D17/00; B25D17/06; H; H01; H01F; H01F41/00; H01F41/02; H01F41/04; H01F41/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
An impact device comprising: a. a hammer element; b. an anvil system having an impact spring member, a drill steel and means for transferring a force pulse from the hammer to the load; and c. the mass of said hammer element, the compliance of said impact spring member and the acoustic transmission of said drill steel having values such that the anvil system has a Q which is selected to be greater than about 0.7, wherein where CS the compliance of said impact spring member M the mass of s said hammer element, and R Rho (density) + OR - c (velocity of sound in drill steel) + OR - S (cross-sectional area of drill steel).
Claim 2
Dependent Claim
116 words
An impact device comprising: a. a hammer element; b. an anvil system having an impact spring member, a drill steel and means for transferring a force pulse from the hammer to the load; and c. the mass of said hammer element, the compliance of said impact spring member and the acoustic transmission of said drill steel having values such that the anvil system has a Q which is selected to be greater than about 0.7, wherein where CS the compliance of said impact spring member M the mass of s said hammer element, and R Rho (density) + OR - c (velocity of sound in drill steel) + OR - S (cross-sectional area of drill steel).
Claim 3
Dependent Claim
91 words
The invention as set forth in claim 1 wherein said anvil system is configured so that it is represented by the following equivalent circuit: a. said load represented by a compliance CL; b. said drill steel represented by transmission line theory as having card characteristic impedance R connected to the load; c. said impact spring member represented by a lumped compliance CS that shunts the top of said drill steel; and d. said hammer element represented by a lumped mass M that shunts the top of the drill steel during impact.
Claim 4
Dependent Claim
23 words
The invention as set forth in claim 2 wherein said circuit includes all the elements and their circuit interrelationship shown in FIG. 4.
Claim 5
Dependent Claim
20 words
The invention as set forth in claim 2 wherein said circuit Q is selected to be between 0.7 and 1.5.
Claim 6
Dependent Claim
43 words
The invention as set forth in claim 4 wherein said impact spring member is folded so that a portion thereof will be placed in tension and another portion in compression when it transfers the force pulse from said hammer to said drill steel.
Claim 7
Dependent Claim
21 words
The invention as set forth in claim 5 wherein said spring is a folded elastic spring member connected to said hammer.
Claim 8
Dependent Claim
53 words
An anvil system for a percussive tool having a hammer which comprises a drill steel adapted to have a bit connected to one end thereof, and a folded impact spring disposed between the opposite end of said drill steel and said hammer for transferring force pulses through said spring to said drill steel.
Claim 9
Dependent Claim
53 words
An anvil system for a percussive tool having a hammer which comprises a drill steel adapted to have a bit connected to one end thereof, and a folded impact spring disposed between the opposite end of said drill steel and said hammer for transferring force pulses through said spring to said drill steel.
Claim 10
Dependent Claim
16 words
The invention as set forth in claim 7 wherein said spring is carried by said hammer.
Claim 11
Dependent Claim
57 words
The invention as set forth in claim 7 wherein said hammer has an opening at the end thereof facing said drill steel, and means for securing said folded spring within said opening, said spring having an outer section and an inner section, at least said inner section extending beyond said hammer face for impact with said steel.
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) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |