Richard W Marshall

US Patent:

55324410, Jul 2, 1996

Filed:

Oct 13, 1994

Appl. No.:

8/322631

Inventors:

Stanley H. Edwards - Raleigh NC
Richard Marshall - Raleigh NC
Tony R. Robbins - Raleigh NC

Assignee:

Square D Company - Palatine IL

International Classification:

H01H 134
H01H 1502

US Classification:

200 16A

Abstract:

The present invention defines a convertible electrical contact. The convertible contact comprises two pair of movable contacts attached to an actuator which is supported by and enclosed within a housing. The actuator is biased to a first position and is slidably movable to a second position in response to a force applied to the actuator. The movable contacts are attached to the distal ends of a flexible member which is supported at its approximate midpoint by the actuator. The movable contacts are also movable between a first position and a second position as the actuator is moved. A pair of contact cavities are defined by the housing such that the one contact cavity lies on each side of the actuator and the flexible member and movable contacts are contained within the cavities. The housing defines a first pair of access apertures associated with the first position of the movable contacts and a second pair of access apertures associated with the second position of the movable contacts. A convertible stationary contact module which includes a pair of bussing conductors, each with a stationary contact attached at its end is employed to complete the electrical contact.

US Patent:

55006302, Mar 19, 1996

Filed:

Oct 13, 1994

Appl. No.:

8/322630

Inventors:

Stanley H. Edwards - Raleigh NC
Richard Marshall - Raleigh NC
Tony R. Robbins - Raleigh NC

Assignee:

Square D Company - Palatine IL

International Classification:

H01H 6702

US Classification:

335132

Abstract:

A solid state overload relay mechanism designed for minimizing the forces required to open an electrical contact associated therewith in the event of a current overload in a protected circuit, and further designed for overcoming residual magnetism in a solenoid initiating the opening of the contact. The contact includes a pair of stationary contacts supported by a base and a pair of movable contact supported by a contact carrier. A latch defines a notch which is normally engaged with a lever. When so engaged, the contact carrier is positioned such that the movable contacts are in contact with the stationary contacts. When the lever becomes disengaged from the latch, the contact carrier is moved and contact between the movable contacts and stationary contacts is broken. The latch is provided with a counterbalance weight to aid in minimizing the force required to return the latch to its original position after the mechanism is tripped. A latch arm extends away from the latch into the path of the lever such that as the lever travels to its extent in an arcuate path, the lever imparts motion on the latch to return it to its initial position, if such has not already occurred.

US Patent:

56157924, Apr 1, 1997

Filed:

Oct 13, 1994

Appl. No.:

8/322844

Inventors:

Stanley H. Edwards - Raleigh NC
Richard Marshall - Raleigh NC

Assignee:

Square D Company - Palatine IL

International Classification:

H02G 308
H02G 316

US Classification:

220 38

Abstract:

An enclosure is for a solid state overload relay mechanism or other device. The enclosure includes a mounting plate (12) defining a pair of upwardly extending flanges (14). A housing includes a lower housing (18) and an upper housing. The mounting plate flanges (14) are received through slotted openings (22) defined by the lower housing (18) and define openings (26) for engaging a tab member (28) defined by the lower housing (18). Each tab member (28) is received within and engaged with a corresponding opening (26) defined by a flange (14). A constant pressure is maintained between the tab member (28) and the mounting plate flange opening (26) such that the relative position between the two is fixed. Mounting profiles are defined by the mounting plate (12) and extend away from the lower housing (18) for retrofitting an existing device. The upper and lower housings (18,20) are held in a conventional snap-fit manner.

US Patent:

40355888, Jul 12, 1977

Filed:

May 28, 1976

Appl. No.:

5/691107

Inventors:

Richard A. Marshall - Durham NC
James W. Smith - Edmonds WA

Assignee:

GTE Automatic Electric Laboratories Incorporated - Northlake IL

International Classification:

H04M 172

US Classification:

179 99

Abstract:

A circuit for controlling multiple signalling sources within a key telephone system for the establishment of priorities. The circuit inhibits connection to, or permits disconnection of a secondary signal source from a selected amplifier whenever a primary signal source is connected to the same amplifier. Circuitry is also provided to indicate the disconnect condition.