Failure detection sensor, failure detection system, and structure

• US 9,952,129 B2
• Filed: 01/27/2015
• Issued: 04/24/2018
• Est. Priority Date: 01/31/2014
• Status: Active Grant

• Current Assignee: Hiei Kensetsu Corporation
• Original Assignee: Hiei Kensetsu Corporation
• Inventors: Kondo, Tsukasa
• Primary Examiner(s): ALLEN, ANDRE J
• Application Number:
  US14/784,181
• Publication Number:
  US 20160370268A1
• Time in Patent Office: 1,183 Days
• Field of Search: None
• CPC Class Codes: F16B 31/02 for indicating the attainment of a particular tensile load or limiting tensile load apparatus for, or method of, determining value of torque or twisting moment for tightening a nut or other member similarly stressed G01L5/24
• CPC Class Codes: F16B 31/021 by means of a frangible part F16B31/025, F16B31/028 take precedence; break members in torque limiters or torque indicators in wrenches or screwdrivers B25B23/1415
• CPC Class Codes: F16B 31/025 with a gauge pin in a longitudinal bore in the body of the bolt
• CPC Class Codes: F16B 5/0642 the plates being arranged one on top of the other and in full close contact with each other
• CPC Class Codes: G01N 3/08 by applying steady tensile or compressive forces G01N3/28 takes precedence
• CPC Class Codes: H01H 35/006 Switches operated by mechanical overload condition, e.g. transmitted force or torque becoming too high

Abstract

Provided is a failure detection sensor which, when attached to structural members of various structures such as buildings can easily detect the risk of the failure of the structural members, and thus the structure, before such failure occurs and has a simple structure, which leads to realization at a low price.

The failure detection sensor comprises: the first member 10 and the second member 20 provided in parallel with the first member 10 such that one end of the second member 20 is fixed to or restricted by the first member 10 and the other end of the second member 20 is not fixed to or restricted by the first member 10, having fracturing characteristics such that the second member 20 fractures during elastic deformation or plastic deformation of the first member 10. The failure detection sensor may have a compression coil spring 40 which applies a tensile force to the other end of the second member 20 on the opposite side of the one end. The first member 10 and the second member 20 are constituted of, for example, a round rod or a square rod and the first member 10 is constituted of, for example, a hollow rod. The second member 20 has a notch 24 which is a stress concentration site between the one end and the other end. The second member 20 is made of brittle materials.

Claims

1. A failure detection sensor, comprising:

a first member,

a second member provided in parallel with the first member such that one end of the second member is fixed to or restricted by the first member and the other end of the second member is not fixed to or restricted by the first member, having fracturing characteristics such that the second member fractures during elastic deformation or plastic deformation of the first member; and

an energizing mechanism for applying a tensile force to the other end of the second member on the opposite side of the one end.

2. The failure detection sensor according to claim 1, wherein the first member is constituted of a hollow rod and the second member is constituted of an inner rod which is inserted into the hollow part of the hollow rod.

3. The failure detection sensor according to claim 1, wherein the second member has a stress concentration site between the one end and the other end.

4. The failure detection sensor according to claim 1, wherein the second member is made of brittle materials.

5. The failure detection sensor according to claim 1, wherein the first member has a press part which presses the second member in the direction toward the other end from the one end when the first member produces elastic deformation or plastic deformation, and the second member has a part to be pressed by the press part.