David J Pearson

US Patent:

39834786, Sep 28, 1976

Filed:

Dec 12, 1974

Appl. No.:

5/532246

Inventors:

David B. Pearson - Raritan NJ

Assignee:

Weston Instruments, Inc. - Newark NJ

International Classification:

G01R 502
G01R 104
G01R 114

US Classification:

324154R

Abstract:

An electric meter particularly characterized by a small number of moving parts and simplified assembly. A coil assembly initially including integral support elements which permit connection of pivot bearings or taut bands is adapted to be accurately positioned for rotation on the supporting base by inserting the assembly into the base. Cooperating locating surfaces on the base and coil assembly provide for accurate positioning of the support elements so the axis of rotation of the coil is in a predetermined position relative to a magnetic circuit of the meter. After insertion of the coil assembly, the bridging elements are severed. A coil support form of unique construction includes motion limiting elements which cooperate with surfaces of the magnetic circuit to limit the permissible extent of movement of the coil, in the event of shock or impact, to positions well within the elastic limit of the supports which mount the coil for rotation. The coil support halves connected together in electrically insulated relation to each other. Damping rings can be secured directly to the respective coil support halves, after the coil form is assembled.

US Patent:

40805700, Mar 21, 1978

Filed:

Nov 3, 1976

Appl. No.:

5/738305

Inventors:

David B. Pearson - Raritan NJ

Assignee:

Sangamo Weston, Inc. - Springfield IL

International Classification:

G01R 104
G12B 908

US Classification:

324156

Abstract:

An electrical device such as a panel meter with a body including an abutment, is inserted through an opening in a panel with the abutment on one side of the panel, and is secured to the panel with a nut plate on the other side of the panel. The body of the meter has plural teeth, discontinuous around the periphery of the body and the teeth extend from opposite sides of the body. The nut plate has an opening with flexible sides to enable snapping the nut plate over the body and teeth to a position abutting the panel to clamp the meter to the panel. Portions of the opening in the nut plate are enlarged so that moving the nut plate to a position in which the body teeth are adjacent the enlarged portions of the opening releases the nut to permit immediate and rapid removal of the meter from the panel. There are several teeth at each side of the body to enable mounting and securing the meter in panels of substantially different thicknesses. Spacers on a front face of the nut plate permit the resilient sides of the nut plate to be snapped over the meter body teeth close to the panel while spacing the nut plate from the panel so the nut plate exerts a bias or pull on the meter which maintains the meter firmly in position on the panel, irrespective of the thickness of the panel.

US Patent:

48402540, Jun 20, 1989

Filed:

Aug 12, 1988

Appl. No.:

7/231407

Inventors:

David B. Pearson - Raritan NJ
Robert A. Wissell - Maywood NJ

Assignee:

Westinghouse Electric Corp. - Pittsburgh PA

International Classification:

B66B 1300

US Classification:

187 57

Abstract:

An electro-mechanical elevator hoistway door interlock which includes an electrical switch mounted adjacent to a hoistway door jamb having a pair of spaced pivotable contact actuatable from first to second positions by a bridging contact carrier by the associated hatch door. The bridging contact pivots the spaced pivotable contacts in opposite rotational directions as they are actuated between the two positions, providing a contact wiping action during each engagement and disengagement. Springs bias the pivotable contacts towards their first positions, and carry current in an active electrical circuit when the pair of spaced pivotable contacts are actuated by the bridging contact.

US Patent:

42387310, Dec 9, 1980

Filed:

Mar 6, 1978

Appl. No.:

5/883671

Inventors:

David B. Pearson - Raritan NJ

Assignee:

Sangamo Weston, Inc. - Norcross GA

International Classification:

G01R 104
G01R 506
G01R 300

US Classification:

324154R

Abstract:

An electric meter particularly characterized by a small number of moving parts and simplified assembly by virtue of fixed cooperating locating surfaces on the elements and sub-assemblies of the meter. A magnetic circuit including a yoke and magnet are constructed to snap into an insulating base in a predetermined position on the base. A coil assembly initially including integral elements for connection of pivot bearings or taut bands is accurately positioned for rotation on the supporting base by inserting the assembly into the base. Cooperating locating surfaces provide for accurate predetermined positioning of the axis of rotation of the coil relative to the magnetic circuit. Additional features of the meter construction reside in a direct gear drive between a zero adjust element and zero adjust knob mounted in a cover for the meter, a unique base, casing, and cover which snap together, a coil support form of unique construction and which includes motion limiting elements which limit the permissible extent of movement of the coil in the event of shock or impact to positions well within the elastic limit of the supports which mount the coil for rotation, a unique mode of terminating the end connections for the coil without the need for stripping insulation, a unique mounting arrangement for the assembled meter, a unique rear mounting scale plate which provides for easily replacing scale plates to meet the needs of the user of the meter, a meter movement of a single size adapted to be used with casings and scales of various sizes whereby the number of different parts required to form meters of different sizes is maintained at a minimum, a unique insulating material base with flexibility to permit expanding the base during assembly of the meter, and sub-assemblies, components, and elements which can be assembled in only one position and orientation to assure proper assembly of the meter.

US Patent:

39978400, Dec 14, 1976

Filed:

Dec 12, 1974

Appl. No.:

5/532245

Inventors:

David B. Pearson - Raritan NJ

Assignee:

Weston Instruments, Inc. - Newark NJ

International Classification:

G01R 104

US Classification:

324156

Abstract:

A panel meter having a unique casing with an adapter on the casing. The meter movement is in a compartment of the casing and the adapter is secured to the casing and cooperates with the casing to define a compartment separate from the meter compartment. Components such as calibrating resistors and rectifiers can be installed, if required, in the separate compartment after the meter movement is installed in the casing. In the preferred embodiment, the casing has a configuration generally in the form of a segment of a cylinder, and the adapter has a segment configuration so that the casing and adapter present a generally cylindrical profile when joined. This arrangement permits using the same basic meter movement and casing to produce meters of different operating characteristics. The meter either with or without the adapter can be inserted through the usual circular opening of a mounting panel. The casing has toothed sides to retain a quick connect panel nut used to secure the meter to the panel.

US Patent:

53068793, Apr 26, 1994

Filed:

Jan 30, 1992

Appl. No.:

7/828103

Inventors:

David B. Pearson - Raritan NJ

Assignee:

Inventio AG - Hergiswil NW

International Classification:

G01G 1914

US Classification:

187131

Abstract:

The load measuring apparatus is arranged at an elevator car and detects the car load brought about by passengers and/or goods transported by the elevator car. An upper crossbeam together with vertically extending supports and a lower crossbeam forms a support frame suspended at traction cables and moves within an elevator shaft along suitable guide rails. A floor frame mounted on isolation pads at the lower crossbeam carries the elevator car. At the roof of the elevator car there is centrally arranged a reference plate member which is part of the load measuring apparatus. A proximity sensor centrally arranged at the upper crossbeam has a predetermined frontal spacing from the reference plate member in the no-load condition of the elevator car. When the elevator car carries a load this predetermined frontal spacing increases as a function of compression of the isolation pads. The proximity sensor then generates an electrical signal or potential which is dependent upon the momentarily prevailing frontal spacing of the sensor from the reference plate member.

US Patent:

53161084, May 31, 1994

Filed:

Sep 4, 1992

Appl. No.:

7/940639

Inventors:

David B. Pearson - Raritan NJ

Assignee:

Inventio AG - Hergiswil

International Classification:

B66B 702

US Classification:

187 95

Abstract:

An apparatus for attaching a guide rail to a girder in an elevator shaft wall provides for vertical displacement of the guide rail relative to the walls of the elevator shaft. The apparatus includes a U-shaped intermediate plate of corrosion-proof metal positioned between the side surfaces of the flange of the guide rail and a U-shaped support bracket. The support bracket, the intermediate plate and the guide rail flange are held against the girder by a longer leg of a U-shaped rail clamp having a shorter leg attached to the girder. The friction coefficient between the side surfaces of the flange of the guide rail and the U-shaped intermediate plate is greater than the friction coefficient between the intermediate plate and the support bracket, so that when the guide rail is displaced vertically, the support bracket will slide on the intermediate plate.