Displacement detector, displacement detection apparatus, displacement detection system, loosening detector, loosening detection apparatus, and loosening detection system
First Claim
1. A displacement detector used for a detection of a relative displacement of a fixed member and a movable member relatively movable with respect to the fixed member, comprising:
- a first member secured to the fixed member and composed of an electrical insulator; and
a second member undergoing relative movement with respect to the fixed member, integrally with the movable member, the second member being disposed opposite to the first member and perpendicular to a direction of the relative movement, and the second member being composed of an electrical insulator, whereineither one of the first member and the second member includes an IC tag for detection performing non-contact communication with a peripheral device, and the other includes a blocking member composed of an electrical conductor that blocks the communication performed by the IC tag for detection, andwhen the second member undergoes at least a predetermined amount of relative movement with respect to the first member, starting from an initial state in which the first member and the second member are relatively overlapped, the IC tag for detection moves from inside to outside a region of the blocking member, or from outside to inside the region thereof, as viewed from a direction perpendicular to the direction of the relative movement.
3 Assignments
0 Petitions
Accused Products
Abstract
The present invention provides a displacement detector for a relative displacement of a fixed member and a movable member, which includes a first member and a second member. The first member is secured to the fixed member and composed of an insulator. The second member moves relative to the fixed member, integrally with the movable member. The second member is disposed opposite to the first member. The second member is composed of an insulator. Either of the first member and the second member includes an IC tag for detection performing non-contact communication, and the other includes a blocking member composed of a conductor blocking the communication performed by the IC tag. When the second member moves a predetermined amount relative to the first member, starting from an initial state, the IC tag for detection moves from inside to outside a region of the blocking member or vice versa.
-
Citations
22 Claims
-
1. A displacement detector used for a detection of a relative displacement of a fixed member and a movable member relatively movable with respect to the fixed member, comprising:
-
a first member secured to the fixed member and composed of an electrical insulator; and a second member undergoing relative movement with respect to the fixed member, integrally with the movable member, the second member being disposed opposite to the first member and perpendicular to a direction of the relative movement, and the second member being composed of an electrical insulator, wherein either one of the first member and the second member includes an IC tag for detection performing non-contact communication with a peripheral device, and the other includes a blocking member composed of an electrical conductor that blocks the communication performed by the IC tag for detection, and when the second member undergoes at least a predetermined amount of relative movement with respect to the first member, starting from an initial state in which the first member and the second member are relatively overlapped, the IC tag for detection moves from inside to outside a region of the blocking member, or from outside to inside the region thereof, as viewed from a direction perpendicular to the direction of the relative movement. - View Dependent Claims (2, 3)
-
-
4. A loosening detector moving rotationally relative to a fastened member to detect loosening of a fastening member that is screwed to a threaded hole of the fastened member, a threaded hole of another fastening member, or male threads of another fastening member so as to fasten the fastened member, the detector comprising:
-
a first member shaped like a ring composed of an electrical insulator, the first member being fixed to the fastened member so that a rotational axis of the fastening member and a center of the first member is concentric, and a second member that is composed of an electrical insulator and moves rotationally relative to the fastened member integrally with the fastening member, the second member comprising a flange and a retainer, the flange being shaped like a ring that is disposed opposite to the fastened member in a direction of the rotational axis and faces the first member, the retainer being provided on an inner circumference side of the flange and fitted with the fastening member to retain, wherein either one of the first member and the second member includes an IC tag for detection performing non-contact communication with a peripheral device, and the other includes a blocking member blocking communication performed by the IC tag, and when the second member undergoes at least a predetermined amount of rotational movement about the rotational axis in a direction to release fastening of the fastening member, starting from an initial state in which the first member and the second member are relatively overlapped, the IC tag moves from inside to outside a region of the blocking member, or from outside to inside the region thereof, as viewed in a direction of the rotational axis. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 21, 22)
-
-
16. A displacement detection system detecting a relative displacement of a fixed member and a movable member relatively movable with respect to the fixed member, the system comprising:
-
a fixed portion fixed to the fixed member; a movable portion disposed opposite to the fixed portion and moving relative to the fixed member integrally with the movable member; an IC tag for detection provided to either one of the fixed portion and the movable portion; a blocking portion blocking communication with the IC tag for detection provided to the other of the fixed portion and the movable portion; and a detection unit performing non-contact communication with the IC tag for detection and detectable whether non-contact communication with the IC tag for detection can be performed, wherein the detection unit detects communication between the IC tag for detection and the detection unit switching from a successful state to an unsuccessful state or an unsuccessful state to a successful state when at least a predetermined amount of relative movement of the movable portion occurs, starting from an initial state in which the fixed portion and the movable portion are relatively overlapped, so that the detection unit detects a relative displacement between the fixed member and the movable member.
-
-
17. A loosening detection system to detect loosening of a fastening member that is screwed to a threaded hole of a fastened member, a threaded hole of another fastening member, or male threads of another fastening member so as to fasten the fastened member, the system comprising:
-
a fixed portion fixed to the fastened member; a movable portion disposed opposite to the fixed portion and moving rotationally relative to the fastened member integrally with the fastening member; an IC tag for detection provided to either one of the fixed portion and the movable portion; a shield provided to the other of the fixed portion and the movable portion and blocking communication with the IC tag for detection; and a detection unit performing non-contact communication with the IC tag for detection and detectable whether the communication with the IC tag for detection can be performed, wherein the detection unit detects the communication between the IC tag for detection and the detection unit switching from a successful state to an unsuccessful state or an unsuccessful state to a successful state when the movable portion rotationally moves relative to the fixed portion by at least a predetermined amount in a direction in which the fastening member is released, starting from an initial state in which the fixed portion and the movable portion are relatively overlapped, so that the detection unit detects loosening of the fastening member. - View Dependent Claims (18, 19, 20)
-
Specification