Calvin Stringer from Palmdale, CA

Name / Title

Company / Classification

Phones & Addresses

Calvin Ray Stringer
President

CS-CS Ind. Inc

PO Box 3138, Santa Clarita, CA 91386

Calvin Stringer
Owner, Principal

Cafra Manufacturing Inc
Whol Professional Equipment

39450 3 St E, Palmdale, CA 93550

Calvin R. Stringer
Director, President, Secretary

Cal Concepts

1398 Elaine Dr, Las Vegas, NV 89142
PO Box 938, Acton, CA 93510

Us Patents

Electrically Actuated Seat Actuator And Lock
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US Patent:

50021729, Mar 26, 1991
Filed:

Jun 7, 1989
Appl. No.:

7/363617
Inventors:

Calvin R. Stringer - Saugus CA
Assignee:

P. L. Porter Company - Woodland Hills CA
International Classification:

F16D 7100
US Classification:

192142R
Abstract:

An electrically driven lockable actuator for an airline seat assembly is provided with an extendable and retractable actuator arm driven through a gear train by an electric motor. The actuator arm can be locked or unlocked through the gear train to the electric motor by manual activation of a clutch mechanism. Regardless of whether the actuator arm is locked or unlocked, the position of the actuator arm is copied by a follower extending exterior to the actuator. The follower is adjustable to selectively activate limit switches to disconnect power to the driving motor. The switch arm is compact and mounted on the actuator so that electrical control of the motor relative to the operation of the lockable actuator is realized without reference to the nature of the design of the seat assembly.

Dual Locking Linear Mechanical Lock For High Loads
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US Patent:

58198814, Oct 13, 1998
Filed:

Jul 24, 1995
Appl. No.:

8/506085
Inventors:

Calvin R. Stringer - Saugus CA
Assignee:

P. L. Porter Co. - Woodland Hills CA
International Classification:

B65H 5910
US Classification:

188 67
Abstract:

A linear mechanical lock comprises an elongated housing. A rod having a first end inserted into the housing and a second end extending out of the housing. A first lock comprising a locking spring having an end fixed in the housing and extending around a portion of the rod. The normal inside diameter of the locking spring is less than the rod's outside diameter so that the spring grips the rod. A moveable handle engages the locking spring, and movement of the handle uncoils the locking spring to release the rod. A second lock comprises a collet having at least one jaw around the rod within the housing. The jaw normally is out of the engagement with the rod. The collet has a first region having an inside diameter around the normal position of the jaw to provide sufficient room for the jaw to be out of engagement with the rod. The collet has a second region adjacent to the first region with an inside diameter having insufficient clearance to provide sufficient room for the jaw to be out of engagement with the rod. A bushing in the housing has an end adjacent to the jaw for pushing the jaw into the second region to force the jaw against the rod.

Low Profile Push-Button Mechanical Remote Control
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US Patent:

57067058, Jan 13, 1998
Filed:

Mar 21, 1996
Appl. No.:

8/621260
Inventors:

Calvin R. Stringer - Saugus CA
Assignee:

P. L. Porter Co. - Woodland Hills CA
International Classification:

F16C 110
G05G 104
A47C 102
US Classification:

74502
Abstract:

A push-button actuator for attachment to a Bowden type remote control cable has a frame, a lever pivoted to the frame and connected to the control wire, a plunger reciprocable through an actuating stroke transverse to the control wire for turning the lever and thereby pulling the control wire from the cable sleeve, an exposed portion of the control wire extending from the cable sleeve to the lever transversely to the plunger stroke. The lower end of the plunger in its normal condition is positioned above the wire and moves to a depressed position below the exposed portion of the wire during the actuation stroke, such that the plunger is unimpeded by the wire in its stroke, allowing the cable sleeve to be attached on the frame at a location vertically intermediate the normal and depressed positions of the lower end of the plunger and thereby achieve a more compact push-button actuator assembly.

Aircraft Seat Leg Support Release Device
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US Patent:

48199877, Apr 11, 1989
Filed:

Nov 18, 1987
Appl. No.:

7/122101
Inventors:

Calvin R. Stringer - Saugus CA
Assignee:

Weber Aircraft - Burbank CA
International Classification:

A47C 750
US Classification:

297434
Abstract:

An extendable footrest or legrest for a passenger seat or the like including a pressure relief system which permits retraction of the footrest upon the application of a predetermined load. The footrest is supported by a hydraulic actuator that is supported by springs that are compressed by the predetermined load to activate the actuator and allow retraction of the footrest.

Spinning Nut Linear Mechanical Lock
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US Patent:

57787336, Jul 14, 1998
Filed:

May 2, 1997
Appl. No.:

8/850645
Inventors:

Calvin R. Stringer - Saugus CA
Assignee:

P. L. Porter Co. - Woodland Hills CA
International Classification:

B60N 208
F16H 2920
US Classification:

74527
Abstract:

A mechanical lock of the type having a lock housing, a rotatable nut axially captive in the housing, a threaded rod axially displaceable through the housing in threading engagement with the nut, and a detent normally locking the nut against rotation in the housing to prevent axial translation of the rod through the housing. Camming surfaces on the nut urge the detent out of locking engagment with the nut when the nut is torqued by axial force on the threaded rod. A detent control element normally keeps the detent in locking engagement with the nut until the detent control element is displaced by an actuator to an unlocked position. The detent control element has a camming surface which urges the detent into locking engagement with the nut when the detent control element is returned to a locking position. The preferred detent is a ball bearing and two variants of the mechanism are disclosed, one having a linearly reciprocating shuttle as the control element, the other using a rotating shaft for this purpose.

Steerable, Self-Powered Shopping Cart Towing Apparatus And Method For Making Same
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US Patent:

55730787, Nov 12, 1996
Filed:

Jun 23, 1995
Appl. No.:

8/494613
Inventors:

Calvin R. Stringer - Saugus CA
Calvin D. Stringer - Palmdale CA
International Classification:

B62D 5104
US Classification:

180 192
Abstract:

A steerable, self-powered device for use in towing and guiding a plurality of shopping carts attached together in a line from one location to another is disclosed which has a pair of electrically driven wheels located in the rear thereof, and a single wheel located in the front thereof for use in steering the towing and guiding device. The towing and guiding device is small and low to the ground, and includes a retaining mechanism which may be attached to the line of shopping carts by connection to the bottom front cross-bar of the front-most shopping cart in the line of shopping carts. The towing and guiding device is powered by one or more batteries, and in the preferred embodiment includes a battery charger and a retractable cord to supply power to the battery charger.

Mechanical Seat Lock
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US Patent:

57944709, Aug 18, 1998
Filed:

Jun 25, 1996
Appl. No.:

8/666878
Inventors:

Calvin R. Stringer - Saugus CA
Assignee:

P.L. Porter Co. - Woodland Hills CA
International Classification:

A47C 3100
US Classification:

70261
Abstract:

The mechanical lock has an elongated housing. A pair of end bushings mounts in the housing, and a rod translates through the end bushings and at least partially through the housing. A pair of coiled locking springs within the housing are around the rod and between the end bushings. One end of each locking spring is fixed within the housing, and the other end of each locking spring is free. The normal inside diameter of each locking spring is less than the outside diameter of the rod so that the locking springs secure the rod. A handle can uncoil the free end of each locking spring to increase their inside diameter and release the rod. A wedge bushing mounts in the housing between the locking springs. The face on each end bushing against its respective locking spring is at an angle, and the wedge bushing also has an angled face on the other side of each spring. Therefore, when the rod and housing are loaded with respect to each other, the angled face of one bushing cants one locking spring, and an angled face of the wedge bushing cants the other locking spring.

Hydraulic Positioner With Integral Continuously Adjustable Stroke Limiter
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US Patent:

54292174, Jul 4, 1995
Filed:

Jun 11, 1993
Appl. No.:

8/075107
Inventors:

Calvin R. Stringer - Saugus CA
Clyde R. Porter - Los Angeles CA
Assignee:

P. L. Porter Co. - Woodland Hills CA
International Classification:

F16F 932
F16F 500
US Classification:

188300
Abstract:

A hydraulic positioner of the type having a piston movable in a hydraulic cylinder and a valve actuatable for releasing the piston for movement in the chamber is provided with a continuously adjustable mechanism for limiting the stroke of the piston. The cylinder and the stroke limiter share a common tubular housing which is partitioned to define the hydraulic chamber, thereby simplifying the device.