US3856436A - Power transmission - Google Patents
Power transmission Download PDFInfo
- Publication number
- US3856436A US3856436A US00315945A US31594572A US3856436A US 3856436 A US3856436 A US 3856436A US 00315945 A US00315945 A US 00315945A US 31594572 A US31594572 A US 31594572A US 3856436 A US3856436 A US 3856436A
- Authority
- US
- United States
- Prior art keywords
- restrictor
- pump
- pressure
- pilot
- adjustable orifice
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2205/00—Fluid parameters
- F04B2205/08—Pressure difference over a throttle
Definitions
- ABSTRACT A pilot operated load compensated variable displacement pump is controlled by a servomotor and a pilot valve to maintain a constant pressure drop across an [52] US Cl. 417/212, 60/450 adjustable orifice in the pump delivery line. The avail- [51] Int. Cl.
- F04b 1/00 able pressure differential for operating the pilot valve [58] Field of Search 417/213, 218, 220, 221, is increased without increasing the pressure drop in 417/222; 91/506; 60/450 the main flow through the adjustable orifice by providing a small restrictor in the operating line to the pilot [56] References Cited valve and establishing a continuous bleed flow through IT STATES PATENTS that restrictor to establish a large pressure differential 2 255 783 9H9 Kendrick 60,450 supplementing that at the adjustable orifice in the 3 6/1959 Van 60/450 main pump delivery line. The bleed is established 3,067,693 12/1962 Lambeck 1.
- the present invention aims to provide an improved load compensated variable displacement pump in which the available pressure for operating the regulator is high, while the pressure drop through the adjustable orifice in the main delivery line is a low one, and thus throttling losses in the main power flow are minimized.
- a pilot operated, load compensated, variable displacement pump for maintaining a predetermined pressure drop across an adjustable orifice which comprises a servomotor for adjusting the pump displacement, a pilot valve for controlling the servomotor, a connection from the pump output ahead of the adjustable orifice for urging the pilot valve toward a position of lesser pump displacement, a connection from the pump output beyond the adjustable orifice for urging the pilot valve toward a position of greater pump displacement, a restrictor in the second connection, and a bleed restriction from the restrictor to maintain a small continuous flow therethrough sufficient to create a pressure drop through the restrictor several times as great as the pressure drop through the adjustable orifice under steady state conditions, whereby a large pressure differential for operating the pilot valve is available without imposing a large pressure drop in the main flow through the adjustable orifice.
- FIG. 1 represents a hydraulic circuit diagram of a pump and control system incorporating a preferred form of the present invention.
- FIG. 2 represents a modified form of the present invention.
- a variable displacement pump has a servomotor 12 for adjusting its displacement and feeds its output into a delivery line 14.
- the delivery line 14 leads through an adjustable orifice 16 to a fluid utilization device 18.
- the adjustable orifice 16 is representative of many types of valves which control the rate of flow to the fluid utilization device, such as one or more fluid motors. In many systems, of which this is typical, the adjustable orifice 16 may comprise a conventional four-way reverse valve.
- the servomotor 12 is controlled by a three-way pilot valve 20 which can supply fluid to the servomotor 12 from the supply line through a branch 22 or can exhaust fluid from the servomotor through an exhaust line 24.
- the pilot valve 20 is urged to the left against a spring 26 by delivery line pressure directed through a brnach 28.
- Also acting on the pilot valve 20 in opposition to delivery line pressure is a lower pressure derived from the delivery line after passing through the adjustable orifice 16 and a fixed orifice 30. This pressure is transmitted through a branch 32.
- a continuous bleed flow through the'restrictor 30 is established by a branch 34 containing a pressure compensated flow control valve 36 feeding into the exhaust line 24.
- a pilot relief valve 38 is connected as an additional possible bleed from the orifice 30 through a branch 40.
- pilot relief valve 38 Whenever the system pressure rises above a predetermined limit, the pilot relief valve 38 will open, causing a further bleed flow through the orifice 30, thus dropping the pressure in conduit 32 and allowing pilot valve 20 to shift to the left and reduce the pump displacement until the pressure overload has ceased.
- the pressure available for operating pilot valve 20 is theoretically the sum of the pressure drops through adjustable orifice 16 and restrictor 30. By making the latter pressure drop relatively high, say five times as high as the former pressure drop, it will be seen that effective control of the pilot valve 20 is maintained without imposing a large pressure drop through the adjustable orifice 16. In this way, substantial power losses in the main flow line are avoided.
- a special pilot relief valve 42 is provided to take the place of the flow control valve 36 and the pilot relief valve 38 together.
- the inner spring 44 of the relief valve poppet is adjusted automatically by means of a piston 46 having a diameter equal to the seat diameter of the poppet.
- a head 48 limits the stroke of piston 46 and a branch line 50 connects the piston 46 to a point ahead of the restrictor 30.
- An auxiliary spring 52 aids in biasing the piston 46 against this pressure.
- a pilot operated load compensated variable displacement pump for maintaining a predetermined pressure drop across an adjustable orifice comprising a servomotor for adjusting the pump displacement, a pilot valve for controlling the servomotor, a connection from the pump output ahead of the adjustable orifice for urging the pilot valve toward a position of lesser pump displacement, a second connection from the pump output beyond the adjustable orifice for urging the pilot valve toward a position of greater displacement, a restrictor in the second connection and a bleed restriction comprising a pressure responsive flow regulator from the restrictor to maintain a small and fixed continuous flow therethrough independent of system pressure and sufficient to create a pressure drop through the restrictor several times as great as the pressure drop through the adjustable orifice under steady state conditions, whereby a large pressure differential for operating the pilot valve is available without imposing a large pressure drop in the main flow through the adjustable orifice.
- a pump as defined in claim 1 wherein the flow regulator comprises an additional restrictor and a compensator for maintaining a constant pressure drop across the additional restrictor.
- a pump as defined in claim 1 which includes a pilot relief valve connected to the restrictor to limit the maximum pump output pressure.
- a pump as defined in claim 2 having a pilot relief valve connected to the first restrictor to limit the maxi mum pump output pressure.
Abstract
Description
Claims (4)
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00315945A US3856436A (en) | 1972-12-18 | 1972-12-18 | Power transmission |
CA180,910A CA983314A (en) | 1972-12-18 | 1973-09-13 | Variable displacement hydraulic pump |
AU60289/73A AU473650B2 (en) | 1972-12-18 | 1973-09-13 | Pilot operated load compensated variable displacement pump |
IT52924/73A IT996264B (en) | 1972-12-18 | 1973-10-04 | IMPROVEMENT IN VARIABLE FLOW PUMP ARRANGEMENTS FOR HYDRAULIC SYSTEMS |
DE19732350390 DE2350390A1 (en) | 1972-12-18 | 1973-10-08 | LOAD COMPENSATED PUMP WITH VARIABLE DISPLACEMENT |
FR7338681A FR2211054A5 (en) | 1972-12-18 | 1973-10-30 | |
JP48127638A JPS589276B2 (en) | 1972-12-18 | 1973-11-13 | Pilot operated load compensated variable displacement pump |
GB5706473A GB1383490A (en) | 1972-12-18 | 1973-12-10 | Pumps |
SE7317029A SE383190B (en) | 1972-12-18 | 1973-12-17 | LOAD COMPENSATED PUMP WITH VARIABLE DEPLACEMENT. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00315945A US3856436A (en) | 1972-12-18 | 1972-12-18 | Power transmission |
Publications (1)
Publication Number | Publication Date |
---|---|
US3856436A true US3856436A (en) | 1974-12-24 |
Family
ID=23226784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00315945A Expired - Lifetime US3856436A (en) | 1972-12-18 | 1972-12-18 | Power transmission |
Country Status (9)
Country | Link |
---|---|
US (1) | US3856436A (en) |
JP (1) | JPS589276B2 (en) |
AU (1) | AU473650B2 (en) |
CA (1) | CA983314A (en) |
DE (1) | DE2350390A1 (en) |
FR (1) | FR2211054A5 (en) |
GB (1) | GB1383490A (en) |
IT (1) | IT996264B (en) |
SE (1) | SE383190B (en) |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS525864A (en) * | 1975-06-28 | 1977-01-17 | Hehl Karl | Controlling system for hydraulic pressure circuit of injection molder |
US4067664A (en) * | 1974-12-31 | 1978-01-10 | Robert Bosch Gmbh | Control system for a pump |
US4118149A (en) * | 1976-02-05 | 1978-10-03 | Hytec Ab | Output regulation in hydraulic and hydropneumatic systems |
US4123202A (en) * | 1975-11-04 | 1978-10-31 | Plessey Handel Und Investments Ag | Hydraulic pumping arrangements |
US4194363A (en) * | 1979-02-21 | 1980-03-25 | General Signal Corporation | Fluid horsepower control system |
US4194364A (en) * | 1977-05-21 | 1980-03-25 | Robert Bosch Gmbh | Arrangement for controlling the operation of a fluid-displacement machine |
JPS5554701A (en) * | 1978-09-28 | 1980-04-22 | Eaton Corp | Loaddresponsible controller for hydraulic system |
US4292805A (en) * | 1979-09-24 | 1981-10-06 | Rexnord Inc. | Servo-valve convertible construction |
JPS61204002U (en) * | 1986-05-14 | 1986-12-22 | ||
JPS62801U (en) * | 1986-05-14 | 1987-01-07 | ||
US4976106A (en) * | 1988-02-18 | 1990-12-11 | Linde Aktiengesellschaft | Load-sensing variable displacement pump controller with adjustable pressure-compensated flow control valve in feedback path |
US5203678A (en) * | 1990-01-11 | 1993-04-20 | Hitachi Construction Machinery Co., Ltd. | Valve apparatus and hydraulic drive system |
US5319932A (en) * | 1993-04-28 | 1994-06-14 | Roche Engineering Corporation | Power sensing regenerator |
GB2279776A (en) * | 1993-05-28 | 1995-01-11 | Dana Corp | A hydraulic load sensing system |
EP0869285A3 (en) * | 1997-04-04 | 1999-09-22 | Brueninghaus Hydromatik Gmbh | Load sensing control with flushing circuit |
US20050047930A1 (en) * | 2002-03-06 | 2005-03-03 | Johannes Schmid | System for controlling a hydraulic variable-displacement pump |
CN103982475A (en) * | 2014-05-30 | 2014-08-13 | 湖南五新重型装备有限公司 | Hydraulic control system for concrete spraying vehicle boom frame |
US20160003237A1 (en) * | 2013-03-27 | 2016-01-07 | Kayaba Industry Co., Ltd. | Pump discharge flow-rate control device |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3941513A (en) * | 1974-09-05 | 1976-03-02 | Parker-Hannifin Corporation | Variable displacement pump control assembly |
US4029439A (en) * | 1975-12-22 | 1977-06-14 | Abex Corporation | Control system for variable displacement pumps |
US4017219A (en) * | 1975-12-22 | 1977-04-12 | Abex Corporation | Control system for variable displacement pumps |
DE2840687A1 (en) * | 1978-09-19 | 1980-04-03 | Bosch Gmbh Robert | DEVICE FOR CONTROLLING THE FLOW RATE AND LIMITING THE DELIVERY PRESSURE OF AN ADJUSTABLE PUMP. |
DE2906166A1 (en) * | 1979-02-17 | 1980-08-28 | Bosch Gmbh Robert | DEVICE FOR CONTROLLING THE FLOW RATE AND LIMITING THE DELIVERY PRESSURE OF AN ADJUSTABLE PUMP |
DE3016609A1 (en) * | 1980-04-30 | 1981-11-05 | G.L. Rexroth Gmbh, 8770 Lohr | Radial vane type pump - has throughput controlled by positioning valve energised by signal from discharge flow meter |
DE3027819A1 (en) * | 1980-07-23 | 1982-02-25 | Backe, Wolfgang, Prof.Dr.-Ing., 5100 Aachen | DEVICE FOR REGULATING A VARIABLE PUMP |
DE3044143A1 (en) * | 1980-11-24 | 1982-06-24 | Linde Ag, 6200 Wiesbaden | CONTROL DEVICE FOR A HYDROSTATIC DRIVE SYSTEM |
DE3146513A1 (en) * | 1980-11-24 | 1982-06-24 | Linde Ag, 6200 Wiesbaden | Control device for a hydrostatic drive system |
DE3112561C2 (en) * | 1981-03-30 | 1985-09-26 | Danfoss A/S, Nordborg | Control device for a liquid pump with adjustable delivery volume |
DE3129440A1 (en) * | 1981-07-25 | 1983-02-10 | Mannesmann Rexroth GmbH, 8770 Lohr | Control device for a variable-delivery pump |
DE3211307A1 (en) * | 1982-03-26 | 1983-09-29 | Linde Ag, 6200 Wiesbaden | ADJUSTABLE AXIAL PISTON PUMP WITH A CONTROL ORGAN AND CONTROLLER FOR SUCH |
DE3345264A1 (en) * | 1983-12-14 | 1985-06-27 | Brueninghaus Hydraulik Gmbh, 7240 Horb | TORQUE CONTROL UNIT FOR AN ADJUSTABLE HYDROPUMP |
DE3622939A1 (en) * | 1986-07-08 | 1988-01-14 | Linde Ag | Hydraulic control or regulating device |
DE3844398C2 (en) * | 1988-12-30 | 1997-07-31 | Rexroth Mannesmann Gmbh | Hydraulic circuit for a variable pump |
DE8906826U1 (en) * | 1989-06-03 | 1989-09-07 | Keicher, Siegfried, 7906 Blaustein, De | |
DE4025638C1 (en) * | 1990-08-13 | 1991-12-05 | Brueninghaus Hydraulik Gmbh, 7240 Horb, De | |
DE4337210A1 (en) * | 1993-10-30 | 1995-05-04 | Rexroth Mannesmann Gmbh | Central hydraulic installation for a motor vehicle |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2255783A (en) * | 1940-02-17 | 1941-09-16 | Manly Corp | Fluid pressure device and system |
US2892311A (en) * | 1958-01-08 | 1959-06-30 | Deere & Co | Hydraulic apparatus |
US3067693A (en) * | 1958-12-24 | 1962-12-11 | United Aircraft Corp | Control means for variable delivery pump |
US3188971A (en) * | 1962-08-13 | 1965-06-15 | Bendix Corp | Control system for a pump |
US3246471A (en) * | 1964-12-10 | 1966-04-19 | Ford Motor Co | Hydraulic drive control |
US3444689A (en) * | 1967-02-02 | 1969-05-20 | Weatherhead Co | Differential pressure compensator control |
US3635021A (en) * | 1969-10-16 | 1972-01-18 | Borg Warner | Hydraulic system |
US3644063A (en) * | 1969-04-05 | 1972-02-22 | Bosch Gmbh Robert | Regulated hydraulic apparatus |
US3768928A (en) * | 1971-06-01 | 1973-10-30 | Borg Warner | Pump control system |
-
1972
- 1972-12-18 US US00315945A patent/US3856436A/en not_active Expired - Lifetime
-
1973
- 1973-09-13 AU AU60289/73A patent/AU473650B2/en not_active Expired
- 1973-09-13 CA CA180,910A patent/CA983314A/en not_active Expired
- 1973-10-04 IT IT52924/73A patent/IT996264B/en active
- 1973-10-08 DE DE19732350390 patent/DE2350390A1/en active Granted
- 1973-10-30 FR FR7338681A patent/FR2211054A5/fr not_active Expired
- 1973-11-13 JP JP48127638A patent/JPS589276B2/en not_active Expired
- 1973-12-10 GB GB5706473A patent/GB1383490A/en not_active Expired
- 1973-12-17 SE SE7317029A patent/SE383190B/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2255783A (en) * | 1940-02-17 | 1941-09-16 | Manly Corp | Fluid pressure device and system |
US2892311A (en) * | 1958-01-08 | 1959-06-30 | Deere & Co | Hydraulic apparatus |
US3067693A (en) * | 1958-12-24 | 1962-12-11 | United Aircraft Corp | Control means for variable delivery pump |
US3188971A (en) * | 1962-08-13 | 1965-06-15 | Bendix Corp | Control system for a pump |
US3246471A (en) * | 1964-12-10 | 1966-04-19 | Ford Motor Co | Hydraulic drive control |
US3444689A (en) * | 1967-02-02 | 1969-05-20 | Weatherhead Co | Differential pressure compensator control |
US3644063A (en) * | 1969-04-05 | 1972-02-22 | Bosch Gmbh Robert | Regulated hydraulic apparatus |
US3635021A (en) * | 1969-10-16 | 1972-01-18 | Borg Warner | Hydraulic system |
US3768928A (en) * | 1971-06-01 | 1973-10-30 | Borg Warner | Pump control system |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4067664A (en) * | 1974-12-31 | 1978-01-10 | Robert Bosch Gmbh | Control system for a pump |
JPS525864A (en) * | 1975-06-28 | 1977-01-17 | Hehl Karl | Controlling system for hydraulic pressure circuit of injection molder |
JPS601170B2 (en) * | 1975-06-28 | 1985-01-12 | カール・ヘール | Control device for fluid pressure circuit of injection molding machine |
US4123202A (en) * | 1975-11-04 | 1978-10-31 | Plessey Handel Und Investments Ag | Hydraulic pumping arrangements |
US4118149A (en) * | 1976-02-05 | 1978-10-03 | Hytec Ab | Output regulation in hydraulic and hydropneumatic systems |
US4194364A (en) * | 1977-05-21 | 1980-03-25 | Robert Bosch Gmbh | Arrangement for controlling the operation of a fluid-displacement machine |
JPS5554701A (en) * | 1978-09-28 | 1980-04-22 | Eaton Corp | Loaddresponsible controller for hydraulic system |
JPH0255642B2 (en) * | 1978-09-28 | 1990-11-28 | Eaton Corp | |
US4194363A (en) * | 1979-02-21 | 1980-03-25 | General Signal Corporation | Fluid horsepower control system |
US4292805A (en) * | 1979-09-24 | 1981-10-06 | Rexnord Inc. | Servo-valve convertible construction |
JPH021521Y2 (en) * | 1986-05-14 | 1990-01-16 | ||
JPH021522Y2 (en) * | 1986-05-14 | 1990-01-16 | ||
JPS62801U (en) * | 1986-05-14 | 1987-01-07 | ||
JPS61204002U (en) * | 1986-05-14 | 1986-12-22 | ||
US4976106A (en) * | 1988-02-18 | 1990-12-11 | Linde Aktiengesellschaft | Load-sensing variable displacement pump controller with adjustable pressure-compensated flow control valve in feedback path |
US5203678A (en) * | 1990-01-11 | 1993-04-20 | Hitachi Construction Machinery Co., Ltd. | Valve apparatus and hydraulic drive system |
WO1994025770A3 (en) * | 1993-04-28 | 1995-01-12 | Roche Eng Corp | Power sensing regenerator |
WO1994025770A2 (en) * | 1993-04-28 | 1994-11-10 | Roche Engineering Corporation | Power sensing regenerator |
US5319932A (en) * | 1993-04-28 | 1994-06-14 | Roche Engineering Corporation | Power sensing regenerator |
AU677395B2 (en) * | 1993-04-28 | 1997-04-24 | Roche Engineering Corporation | Power sensing regenerator |
GB2279776A (en) * | 1993-05-28 | 1995-01-11 | Dana Corp | A hydraulic load sensing system |
GB2279776B (en) * | 1993-05-28 | 1997-09-24 | Dana Corp | Hydraulic load sensing system |
EP0869285A3 (en) * | 1997-04-04 | 1999-09-22 | Brueninghaus Hydromatik Gmbh | Load sensing control with flushing circuit |
US20050047930A1 (en) * | 2002-03-06 | 2005-03-03 | Johannes Schmid | System for controlling a hydraulic variable-displacement pump |
US20160003237A1 (en) * | 2013-03-27 | 2016-01-07 | Kayaba Industry Co., Ltd. | Pump discharge flow-rate control device |
CN103982475A (en) * | 2014-05-30 | 2014-08-13 | 湖南五新重型装备有限公司 | Hydraulic control system for concrete spraying vehicle boom frame |
CN103982475B (en) * | 2014-05-30 | 2016-03-02 | 湖南五新隧道智能装备股份有限公司 | A kind of concrete ejection car jib hydraulic control system |
Also Published As
Publication number | Publication date |
---|---|
AU473650B2 (en) | 1976-07-01 |
IT996264B (en) | 1975-12-10 |
AU6028973A (en) | 1975-03-13 |
DE2350390C3 (en) | 1979-08-30 |
SE383190B (en) | 1976-03-01 |
DE2350390A1 (en) | 1974-07-04 |
JPS4989202A (en) | 1974-08-26 |
GB1383490A (en) | 1974-02-12 |
FR2211054A5 (en) | 1974-07-12 |
DE2350390B2 (en) | 1979-01-11 |
JPS589276B2 (en) | 1983-02-19 |
CA983314A (en) | 1976-02-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3856436A (en) | Power transmission | |
US3820920A (en) | Power transmission | |
US4559778A (en) | Control device for a hydrostatic transmission | |
US3444689A (en) | Differential pressure compensator control | |
US4293284A (en) | Power limiting control apparatus for pressure-flow compensated variable displacement pump assemblies | |
GB1332798A (en) | Hydraulic system | |
US2238063A (en) | Fluid pressure system and valve mechanism therefor | |
GB1160619A (en) | Adjustable, Metered, Directional Flow Control Arrangement | |
GB1112618A (en) | Adjustable, metered, directional flow control arrangement | |
US4067664A (en) | Control system for a pump | |
US2472477A (en) | Volume control system for pumps | |
US2238060A (en) | Fluid pressure feed and rapid traverse system of transmission of power | |
GB1398782A (en) | Hydraulic system | |
GB1307914A (en) | Hydraulic apparatus for regulating the flow of one or more pumps | |
US2328980A (en) | Power transmission | |
US3532104A (en) | Pressure compensated flow control valve system | |
US4072443A (en) | Control valve arrangements for variable stroke pumps | |
US5222870A (en) | Fluid system having dual output controls | |
GB1396926A (en) | Control device for load-independent regulation of hydraulic consumers | |
GB1395190A (en) | Pumps and motors | |
US4194363A (en) | Fluid horsepower control system | |
US3784327A (en) | Power transmission | |
US3908377A (en) | Control system for a hydrostatic transmission | |
SE463828B (en) | DEPLACEMENT CONTROL SYSTEM WITH TWO PRESSURES | |
US3785398A (en) | Power transmission |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SPERRY CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:SPERRY RAND CORPORATION;REEL/FRAME:003794/0122 Effective date: 19790824 |
|
AS | Assignment |
Owner name: VICKERS, INCORPORATED TROY, MI A DE CORP Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. EFFECTIVE NOVEMBER 2, 1983;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889 Effective date: 19831102 Owner name: VICKERS, INCORPORATED,MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SPERRY CORPORATION A DE CORP.;REEL/FRAME:004337/0889 Effective date: 19831102 |