US3844197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic motor and drive attachment
Assignee: Individual
•
Filing: 1972-10-18
•
Granted: 1974-10-29
•
Expires: 1992-10-18
Abstract
Abstract A small hydraulic motor of the type for being axially advanced in an enclosure tube and comprising a tubular frame means having an inlet at one end and operatively positioning an output shaft at the other for means such as a cutting tool or root saw. The motor includes an attachment for converting longitudinal movement to arcuate movement and valve means are provided in the frame means adjacent the inlet for transmitting pressure liquid to a piston in a pressure chamber in the frame means for advancing and retraction movement of the piston, alternately, and rearwardly directed jet exhaust bores are provided in the frame means and end cap to cause the motor to advance in an enclosure tube with flow of hydraulic pressure fluid into and through the motor and angled to resist rotation of the motor itself thus twisting the hose. Two sets of jets are provided angled oppositely so that a proper twist resistance is always present, in forward and reverse portions of the cycle. This invention relates to small hydraulic motors, especially of the type that could be used in sewers and similar tubular enclosures for being progressively advanced through the sewer for clearing any obstacle provided therein, the motor is driven by pressure liquid supplied thereto through a flexible tube connecting to the inlet end of the motor and moving with the motor along in the sewer or other enclosure.
Inventors
- 👤 S Kramer
- 👤 E Cebular
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:43
CPC Classifications
F; F01; F01L; F01L23/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
279 words
A hydraulic motor comprising a tubular member having an inlet end and a center bore and having a plurality of axially extending bores extending into the wall of the tubular member from an inlet end thereof and terminating in communication with the center bore of the member, such member forming a pressure chamber, a piston slidably received in said tubular member, a tubular piston rod secured to said piston and protruding from the other end of the tubular member, an inlet end cap secured to the inlet end of said tubular member, valve means including an axially movable closure means received in said end cap and forming a closure for the inlet end of said pressure chamber, said valve means when open enabling water flow therethrough to drive said piston in one direction and when closed forcing water into said bores in said tubular member for flow to said chamber to force said piston in the opposite direction, rod means slidably received in said piston rod and extending through said piston to engage said closure means to control its position and the action of said valve means dependent on the position of said piston in said chamber; said valve means including an inner cup member, an outer cup member slidably receiving said inner cup member, said rod means engaging said inner cup member, and detents engaging said inner cup member to retain it in a valve open or a valve closed position; and a check valve plate operatively engaging the downstream face of said outer cup member, and spring means engaging said check valve plate to urge it into engagement with said outer cup member for valve closing action.
Claim 2
Dependent Claim
279 words
A hydraulic motor comprising a tubular member having an inlet end and a center bore and having a plurality of axially extending bores extending into the wall of the tubular member from an inlet end thereof and terminating in communication with the center bore of the member, such member forming a pressure chamber, a piston slidably received in said tubular member, a tubular piston rod secured to said piston and protruding from the other end of the tubular member, an inlet end cap secured to the inlet end of said tubular member, valve means including an axially movable closure means received in said end cap and forming a closure for the inlet end of said pressure chamber, said valve means when open enabling water flow therethrough to drive said piston in one direction and when closed forcing water into said bores in said tubular member for flow to said chamber to force said piston in the opposite direction, rod means slidably received in said piston rod and extending through said piston to engage said closure means to control its position and the action of said valve means dependent on the position of said piston in said chamber; said valve means including an inner cup member, an outer cup member slidably receiving said inner cup member, said rod means engaging said inner cup member, and detents engaging said inner cup member to retain it in a valve open or a valve closed position; and a check valve plate operatively engaging the downstream face of said outer cup member, and spring means engaging said check valve plate to urge it into engagement with said outer cup member for valve closing action.
Claim 3
Dependent Claim
33 words
A hydraulic motor as in claim 1 where bore means connect an inlet section of said pressure chamber to radially outer portions of said detents to provide inner cup member retentive pressure thereon.
Claim 4
Dependent Claim
86 words
A hydraulic motor as in claim 1 and including an outlet end cap secured to said other end of saId tubular member, a guide disc means secured within the motor and extending across the chamber to close the outlet end thereof, said disc means slidably engaging said piston rod, a tubular means rotatably engaged and positioned by said outlet end cap, a tool means operatively carried by said tubular means, and means connecting said tubular means to said piston rod for axial and rotary drive thereby.
Claim 5
Dependent Claim
124 words
A hydraulic motor as in claim 1 wherein said outer cup member abuts on the inlet end of said tubular member and has a wall with axially extending bores connecting to the wall bores in said tubular member, said outer cup member having valve bores in a base portion thereof, said inner cup member having circumferentially spaced valve bores in a base portion thereof and having valve open and valve closed positions, said valve bores in said inner and outer cup members being circumferentially offset from each other, said detents being carried by said outer cup member to engage said inner cup member and resiliently retain it in valve open or closed position, said detents being positioned for movement radially of said cup members.
Claim 6
Dependent Claim
81 words
A hydraulic motor as in claim 4 where said rod means has a collar fixed thereto adjacent its end remote from said valve means, a spring is in telescopic engagement with said rod means at each end of said collar, and sleeve means individually operatively engage the opposite ends of said springs to compress one of said springs as said piston approaches an end of its movement to aid in moving said second cup member from one valving position to another.
References Cited (Backward Citations)
US917917A
Cited
US1094811A
Cited
US2039570A
Cited
US2556680A
Cited
US2769912A
Cited
US3130644A
Cited
US3264949A
Cited
US3205786A
Cited
US3274899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |