Patent US2328042A successfully refreshed from Google Patents.
US3868035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth working machine protector
Assignee: Tripple I & 0 Products Inc
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Filing: 1973-09-21
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Granted: 1975-02-25
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Expires: 1993-09-21
Abstract
Abstract A bypass solenoid valve connects the high pressure and low pressure hydraulic line of an earth working machine such as a trencher, backhoe or earth borer. The valve is normally open so that the machine is inoperative. The machine is made operative only if a key operated switch in the solenoid valve circuit is closed; therefore, the device acts to prevent thefts. In addition, if the earth working tool touches a buried pipe, buried cable, or other object to which a detector is attached, a sensitive electronic circuit de-energizes the solenoid valve, thus deactivating the machine to prevent damage to the buried object.
Inventors
- 👤 Johnny Lee Broyles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:56
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/24; E02F9/245; Y; Y10; Y10S; Y10S37/00; Y10S37/906
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
In an earth working machine having a. a vehicle, b. an earth working tool connected to the vehicle by c. movable structure, d. a hydraulic pump mounted on the vehicle, e. hydraulic hoses connecting said pump to at least one f. hydraulic motor attached to the movable structure whereby the earth working tool is manipulated, g. said hoses including a high pressure line from the pump to the motor, and h. detecting means for detecting that the tool is proximate an obstruction, j. the improved structure comprising: k. a bleed valve attached to the high pressure line, m. said valve connecting the high pressure line to a low pressure point, n. an electric solenoid controllingly attached to said valve, o. said valve open unless the solenoid is energized, and p. a key operated switch electrically connected to said solenoid, q. said switch forming means for de-energizing said solenoid responsive to operation of said switch.
Claim 2
Dependent Claim
154 words
In an earth working machine having a. a vehicle, b. an earth working tool connected to the vehicle by c. movable structure, d. a hydraulic pump mounted on the vehicle, e. hydraulic hoses connecting said pump to at least one f. hydraulic motor attached to the movable structure whereby the earth working tool is manipulated, g. said hoses including a high pressure line from the pump to the motor, and h. detecting means for detecting that the tool is proximate an obstruction, j. the improved structure comprising: k. a bleed valve attached to the high pressure line, m. said valve connecting the high pressure line to a low pressure point, n. an electric solenoid controllingly attached to said valve, o. said valve open unless the solenoid is energized, and p. a key operated switch electrically connected to said solenoid, q. said switch forming means for de-energizing said solenoid responsive to operation of said switch.
Claim 3
Dependent Claim
46 words
The invention as defined in claim 1 with additional limitations of r. a source of electrical energy attached to said solenoid through s. a control circuit, t. said control circuit being a control means for de-energizing said solenoid responsive to a signal from said detecting means.
Claim 4
Dependent Claim
21 words
The invention as defined in claim 2 with an additional limitation of u. said control circuit utilizing solid state electronic elements.
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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |