US3602035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for testing the lubricating properties of an oil
Assignee: Gulf Research and Development Co
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Filing: 1969-11-28
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Granted: 1971-08-31
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Expires: 1989-11-28
Abstract
Abstract Apparatus for testing the friction-reducing characteristics of an oil utilizing a cylinder piston rod and piston assembly and a cantilever spring which tends to cock the piston in the cylinder as it is cranked. This simulates severe friction conditions encountered in an engine under some starting conditions. Means to control the temperature of the cylinder and means to run tests automatically are also provided.
Inventors
- 👤 Carl R Spohn
- 👤 Ross M Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:00
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
184 words
In combination, support means and a cylinder and piston assembly, means to mount the cylinder of said piston and cylinder assembly on said support means for oscillating motion of said cylinder about an oscillating axis, said oscillating axis being disposed substantially perpendicular to the axis of said cylinder, piston driving means mounted on said support means to simultaneously reciprocate said piston within said cylinder and to cause said piston and cylinder assembly to oscillate about said oscillating axis in a plane containing the axis of said cylinder; and means to resiliently bias said cylinder when said cylinder moves to at least one side of a geometrically centered null position in its oscillating motion in said plane about said oscillating axis from side-to-side of said null position, said biasing means increasingly biasing said cylinder with increasing motion of said cylinder to said at least one side of said null position; whereby the lubricating qualities of an oil between said piston and said cylinder may be measured by measuring the reaction at said driving means of the resistance against motion of said piston within said cylinder.
Claim 2
Dependent Claim
184 words
In combination, support means and a cylinder and piston assembly, means to mount the cylinder of said piston and cylinder assembly on said support means for oscillating motion of said cylinder about an oscillating axis, said oscillating axis being disposed substantially perpendicular to the axis of said cylinder, piston driving means mounted on said support means to simultaneously reciprocate said piston within said cylinder and to cause said piston and cylinder assembly to oscillate about said oscillating axis in a plane containing the axis of said cylinder; and means to resiliently bias said cylinder when said cylinder moves to at least one side of a geometrically centered null position in its oscillating motion in said plane about said oscillating axis from side-to-side of said null position, said biasing means increasingly biasing said cylinder with increasing motion of said cylinder to said at least one side of said null position; whereby the lubricating qualities of an oil between said piston and said cylinder may be measured by measuring the reaction at said driving means of the resistance against motion of said piston within said cylinder.
Claim 3
Dependent Claim
27 words
The combination of claim 1, wherein said biasing means additionally equally biases on both sides of said cylinder when it moves from side-to-side of said null position.
Claim 4
Dependent Claim
55 words
The combination of claim 1, said biasing means comprising a cantilever spring having one end removably fixed to said support means and extending parallel to the axis of said cylinder and piston assembly in the null position of said cylinder, and means on said cylinder operatively cooperable with the free end of said cantilever spring.
Claim 5
Dependent Claim
26 words
The combination of claim 3, and means cooperable with said support means and said cantilever spring adapted to control the effective length of said cantilever spring.
Claim 6
Dependent Claim
14 words
The combination of claim 1, and means to control the temperature of said cylinder.
Claim 7
Dependent Claim
65 words
The combination of claim 5, said cylinder temperature control means comprising a dual wall construction of said cylinder, a pair of conduits cooperating with the space between the dual walls of said cylinder, a coolant sump containing temperature controlling liquid, means to control the temperature of said liquid, and means to pump said liquid from said sump through said cylinder and back to said sump.
Claim 8
Dependent Claim
73 words
The combination of claim 6, fluid flow conduit means interconnecting said cylinder and said sump, three way valve means in said conduit means, and means to flow a liquid other than the liquid in said sump via said valve means through said cylinder and to a drain, whereby operation of said valve means when using heated liquid in said sump permits flowing of cold water through said cylinder to rapidly cool said cylinder.
Claim 9
Dependent Claim
70 words
The combination of claim 1, said piston driving means comprising a cradle-mounted electric motor, a piston driving pin block at one end of the rotor of said motor, a piston driving pin extending from said pin block into a suitably formed opening in the free end of said piston, and means to control the distance between the axis of said piston driving pin and the axis of said motor rotor.
Claim 10
Dependent Claim
65 words
The combination of claim 1, said piston driving means comprising a cradle-mounted electric motor, means to measure the amount of motion of the casing of said motor produced as a reaction of the resistance against motion of said piston within saId cylinder, said motion measuring means comprising a flange fixed to said motor casing, and amount of motion measuring means operatively cooperable with said flange.
Claim 11
Dependent Claim
79 words
The combination of claim 1, said piston driving means comprising a cradle-mounted electric motor, an arm fixed to the casing of said motor, means to selectively rigidly fix said arm and said casing and to selectively release said arm to measure the reaction of the resistance against motion of said piston in said cylinder when a test of a lubricating oil in said cylinder is being made, and means to automatically start said cradle-mounted motor and run said test.
Claim 12
Dependent Claim
136 words
The combination of claim 10, said automatic testing means comprising a synchronous motor mounted on said support means, first, second and third cams driven by said synchronous motor, an electric control box including a pushbutton switch to start said synchronous motor, a first microswitch cooperable with said first cam to establish a holding circuit to keep said synchronous motor running for a length of time determined by said first cam, a second microswitch operable by said second cam to start said cradle-mounted motor and to keep said cradle-mounted motor running for a length of time determined by said second cam, and spring loaded operating arm locking means operable by said third cam to unlock said operating arm for a predetermined length of time and in relation to the timing determined by said first and second cams.
References Cited (Backward Citations)
US3353398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |