Mark J Bartholomew

US Patent:

7400135, Jul 15, 2008

Filed:

Feb 23, 2007

Appl. No.:

11/710020

Inventors:

Mark R. Bartholomew - Chino Hills CA, US
Richard Leonard - Santa Ana CA, US
Thomas Wohlhieter - Fontana CA, US

Assignee:

Quality One Test Fixturing, Inc. - Ontario CA

International Classification:

G01R 31/28
G01R 31/02

US Classification:

3241581, 324755

Abstract:

A Printed Circuit Board (PCB) test fixture includes flex sensors for monitoring the flex (or distortion) of the PCB during testing. The PCB is positioned above irregular array of test probes. The test probes are aligned with electrical test points on the PCB. The PCB is then pressed downward against the test probes by an irregular array of pushers. The positions of the pushers are generally specified by a PCB manufacturer to avoid PCB elements and the positions of the test probes are generally specified by the PCB manufacturer to obtain desired signals.

US Patent:

20080203257, Aug 28, 2008

Filed:

Feb 23, 2007

Appl. No.:

11/710021

Inventors:

Mark Bartholomew - Chino Hills CA, US

International Classification:

A47G 29/02

US Classification:

248235

Abstract:

A portable display frame includes a support frame and improved telescoping support bars. Each of the improved telescoping support bars includes a pass-through engaging slot on a first telescoping support bar section and an easily replaceable attachment projection member on a last telescoping support bar section. Known support bars require flexing the support bar to pass a closed end engaging slot on the first telescoping support bar section past a middle engaging hub, often resulting in damage to the telescoping support bar. The pass-through engaging slot of the present invention passes over the middle engaging hub without requiring flexing. Further, attachment projections on known support bars have broken and required time consuming repair or replacement of the support bar, often at an inconvenient time and location. The replaceable attachment projection member allows simple and easy repair when the attachment projections break.

US Patent:

53111206, May 10, 1994

Filed:

Jan 6, 1993

Appl. No.:

8/001074

Inventors:

Mark R. Bartholomew - Ontario CA

International Classification:

G01R 3102
G01R 1073

US Classification:

324158F

Abstract:

An apparatus is provided for testing both the integrity and the functionality of the electrical circuit tracings on a printed circuit board. The apparatus is a bed-of-nails test fixture. The device has a plurality of parallel test probes affixed to the bottom plate of the fixture. The plurality of test probes consists of a plurality of short probe members and a plurality of long probe members. The height of the long probe members is telescopically alterable between the height of the short probe members and the maximum height of the long probe members. The long probe members have an internal spring which tends to maintain the long probe members at their maximum height. The device also has two slide bars disposed on opposite sides of the fixtures. The slide bars have a plurality of key hole shaped apertures. Affixed within the bottom plate of the fixture is a corresponding plurality of holding pins, each having a head dimensioned to pass through the wide portion of a key hole shaped aperture but not the narrow portion.

US Patent:

60844221, Jul 4, 2000

Filed:

Nov 10, 1997

Appl. No.:

8/966757

Inventors:

Mark Bartholomew - Ontario CA

International Classification:

G01R 3102

US Classification:

324761

Abstract:

An improved device for testing electrical circuit tracings on a printed circuit board is provided. The device includes a first plate, a second plate and connecting elements for connecting the first and second plates to one another, such that one or both of the plates can be moved relative to one another such that one or both of the plates can be moved relative to the other between a distal position wherein the plates are distal to one another and a proximal plate position wherein the plates are proximal to one another. The device further includes retaining device, which preferably is a pull-out tray, for retaining a printed circuit board between and substantially parallel to the first and second plates and a plurality of test probes disposed either above the retaining device and/or below the retaining device. The test probes are disposed so as to contact a trace on a circuit board being tested when that circuit board is disposed on the retaining device and when the plates are in the proximal plate position. The connecting elements include a motor operatively connected to at least one of the plates by a pair of horizontally slidable cam bars which are attached to at least one of the plates by a cam follower connection.