Miniature electrical voltage and continuity tester with circuit compartment and test lead compartment casing

• US 4,176,315 A
• Filed: 05/11/1978
• Issued: 11/27/1979
• Est. Priority Date: 05/11/1978
• Status: Expired due to Term

• Current Assignee: Earl D. Sunnarborg
• Original Assignee: Earl D. Sunnarborg
• Inventors: Sunnarborg, Earl D.
• Primary Examiner(s): Strecker, Gerard R.
• Application Number:
  US05/904,784
• Time in Patent Office: 565 Days
• Field of Search: 324/51, 324/53, 324/73 R, 324/72.5, 324/115, 324/133, 324/149, 324/156, 361/399
• US Class Current: 324/156
• CPC Class Codes: G01R 1/04 Housings; Supporting members; Arrangements of terminals
• CPC Class Codes: G01R 19/155 Indicating the presence of voltage
• CPC Class Codes: G01R 31/52 Testing for short-circuits, leakage current or ground faults
• CPC Class Codes: G01R 31/54 Testing for continuity

Abstract

A miniature electrical tester provides a wide range of voltage and electrical continuity testing capabilities. A molded plastic front case has a partition which separates it into a circuit compartment and a test lead compartment. A circuit board is located in the circuit compartment, and test leads which are connected to the circuit board are stored in the test lead compartment when not in use. A molded plastic back cover has a circuit cover section which covers the circuit compartment, a test lead cover section which covers the test lead compartment, and a flexible hinge section located between the circuit and test lead cover sections. The positioning of batteries and the innerconnection of the batteries within the circuit compartment, together with the location of the remaining components of the circuit board permit the circuit board to be held securely in place by a single screw and a compression pad.

Claims

1. A miniature electrical tester comprising:

a molded plastic front case having a front wall and four side walls, a partition which separates the front case into a circuit compartment and a test lead compartment, a plurality of bosses on an inner surface of the front case for holding a plurality of batteries in position in the circuit compartment, and a plurality of holding pins on an inner surface of the front case for holding a battery interconnecting wire in position in the circuit compartment;

a circuit board for supporting and connecting electrical circuit components into testing circuitry, the components including an indicator light which is controlled by the testing circuitry, the indicator light being exposed through an indicator light aperture in the front wall of the front case when the circuit board is in position in the circuit compartment, the circuit board further including battery contacts for making electrical connection between the batteries and the circuit board;

first and second test leads connected to the circuit board for connecting an input to the test circuitry when in use and and which may be stored in the test lead compartment when not in use;

a molded plastic back cover having a circuit cover section for covering the circuit compartment, a test lead cover section for covering the test lead compartment, and a flexible hinge section located between the circuit cover and test lead cover sections and essentially covering the partition;

latch means for releasably holding the test lead cover section in closed position covering the test lead compartment;

screw means for holding the circuit cover section in position covering the circuit compartment; and

means between the circuit cover section and the circuit board for holding the circuit board in position with the battery contacts in contact with the batteries when the screw means holds the circuit cover section in position.

2. The miniature electrical tester of claim 1 wherein the components include a switch for selecting either a continuity or a voltage testing mode, a portion of the switch being exposed thorugh a switch aperture in the front wall.

3. The miniature electrical tester of claim 2 wherein a locating plane for the circuit board is defined by the battery contacts engaging the batteries and the switch engaging an inner surface of the front case.

4. The miniature electrical tester of claim 1 wherein the plurality of holding pins project from the inner surface of the front wall and are positioned with respect to the side walls to hold the battery interconnecting wire therebetween.

5. The miniature electrical tester of claim 1 wherein the latch means is located at an opposite end of the test lead cover section from the hinge section.

6. The miniature electrical tester of claim 5 wherein the latch means comprises a snap latch having a first portion at the end of the test lead cover section and a second, mating portion on a side wall of the front case.

7. The miniature electrical tester of claim 1 wherein the circuit board has a first side facing the front wall and a second side facing the circuit cover section of the back cover.

8. The miniature electrical tester of claim 7 wherein the test leads are connected to the first side of the circuit board, pass through holes in the circuit board, pass over the partition, and into the test lead compartment.

9. The miniature electrical tester of claim 8 wherein the flexible hinge section has a reduced thickness and is located with respect to the partition to permit the test leads to pass over the partition without obstruction when the test lead cover section is in either an open or a closed position.

10. The miniature electrical tester of claim 7 wherein the components are mounted on the first side of the circuit board and electrical interconnections of the components are provided on the second side.

11. The miniature electrical tester of claim 1 wherein the means between the circuit cover section and the circuit board comprises a compression pad.

12. A miniature electrical tester comprising:

a molded plastic front case having a front wall and four side walls, a partition which separates the front case into a circuit compartment and a test lead compartment;

a circuit board for supporting and connecting electrical circuit components into testing circuitry, the components being mounted on a first side of the circuit board facing the front wall and including an indicator light which is controlled by the testing circuitry, the indicator light being exposed through an indicator light aperture in the front wall of the front case when the circuit board is in position in the circuit compartment, the circuit board further including battery contacts on the first side for making electrical connection between terminals of a plurality of batteries in the circuit compartment and the circuit board;

wherein a locating plane for the circuit board is at least partially defined by the battery contacts engaging the terminals of the batteries;

first and second test leads connected to the circuit board for connecting an input to the test circuitry when in use and which may be stored in the test lead compartment when not in use;

a molded plastic back cover having a circuit cover section for covering the circuit compartment, a test lead cover section for covering the test lead compartment, and a flexible hinge section located between the circuit cover and test lead cover sections and essentially covering the partition;

latch means for releasably holding the test lead cover section inclosed position covering the test lead compartment;

screw means for holding the circuit cover section in position covering the circuit compartment; and

means between the circuit cover section and the circuit board for holding the circuit board in position with the battery contacts in contact with the terminals of the batteries when the screw means holds the circuit cover in position.

13. The miniature electrical tester of claim 12 wherein the test leads are connected to the first side of the circuit board, pass through holes in the circuit board, pass over the partition, and into the test lead compartment.

14. The miniature electrical tester of claim 13 wherein the flexible hinge section has a reduced thickness and is located with respect to the partition to permit the test leads to pass over the partition without obstruction when the test lead cover section is in either an open or a closed position.