Load measuring gage

• US 4,090,399 A
• Filed: 07/31/1974
• Issued: 05/23/1978
• Est. Priority Date: 07/31/1974
• Status: Expired due to Term

• Current Assignee: The United States of America as represented by the Secretary of the Interior
• Original Assignee: The United States of America as represented by the Secretary of the Interior
• Inventors: Babcock, Clarence O.
• Primary Examiner(s): Haroian, Harry N.
• Application Number:
  US05/493,295
• Time in Patent Office: 1,392 Days
• Field of Search: 73/88 R, 73/88 F, 73/141 AB, 116/DIG. 34, 85/62, 151/36, 151/38
• US Class Current: 73/761
• CPC Class Codes: G01B 5/30 for measuring the deformation in a solid, e.g. mechanical strain gauge
• CPC Class Codes: G01L 1/04 by measuring elastic deformation of gauges, e.g. of springs
• CPC Class Codes: Y10S 116/34 Tension indicating

Abstract

A load measuring gage generally shaped like a conventional split ring washer. In the center opening of the gage a shaft, which mounts the device whose load is to be measured, may extend through the washer. The opening for the washer is cut diagonally so that the loading and unloading forces acting upon it are collinear thereby reducing friction that resist its opening and closing to a minimum. This is accomplished by orienting the angle between the split ring surface and adjacent bearing surface to be between 50° and 62°. A force indicating pointer and scale can be attached to the washer to inform observers visually of variations in the force applied to the gage. In this way if the tension on a mine rock bolt is being measured, observers may safely be informed of the force on the in situ bolt from a distance.

Claims

1. A combined load gage and indicating device comprising:

a deformable spiral ring gage body having two outer load bearing surfaces and a split ring section located along the length of the body adjacent said bearing surfaces and therebetween, said section comprising two opposing surfaces of the body each of which is oriented at an angle of between 50 to 62 degrees with respect to its adjacent load bearing gage body surface; and

a deformation indicating device and scale attached to said gage body to visually indicate the amount of force on said bearing surface.

2. The combination of claim 1 wherein said indicating device comprises an elongated rigid pointer member that is hinged along its length between its free end and the gage body.