JPH02121613U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a front view of the device of the present invention before tightening, Fig. 2 is a vertical side view thereof, Fig. 3 is a front view of the device after tightening, and Fig. 4 is a longitudinal side view thereof.
Figure 5 A and B are cross-sectional abbreviations of U used in the device of the present invention.
FIG. 6 is a perspective view of a sign member used in the device of the present invention; FIG. 7 is a perspective view of an elastic synthetic resin ring used in the device of the present invention; FIG.
The figure is a perspective view of a washer having a substantially U-shaped cross section with a marker member attached and an elastic synthetic resin ring interposed therebetween. P1 and P2 are objects to be fastened, H1 and H2 are through holes,
S is a gap, 1 is a bolt, 2 is a nut, 3 is a washer with a roughly U-shaped cross section, 3A, 3B are upper and lower plates, 3C
4 is a connecting piece, 4 is a marker member, 5 is an elastic synthetic resin ring, 5A is a notch, 5B is an inner broken piece, 5C is an outer broken piece, and 6 is a washer.

Amendment 2.5.8 Hei 2. The scope of claims for utility model registration is amended as follows.

[Scope of Claim for Utility Model Registration] A cross section in which the upper and lower plates have an opening in the center through which the shaft of the screw component is inserted, and a part of the outer periphery of the upper and lower plates is connected by a connecting piece that protrudes to the outside of the seat surface of the screw component. A washer with a roughly U-shaped surface, a marker member attached to the connecting piece of the washer, and between the upper and lower plates of the washer, the outer diameter is at least larger than the seat surface of the threaded part, and the inner diameter is approximately equal to the thickness of the shaft of the threaded part. An elastic synthetic resin ring is interposed, and the washer and ring are compressed by tightening the screw parts, and when a substantially specified pressure is reached, the ring is broken at the portion of the washer where the overlapping upper and lower plates are located, and the A device for indicating incomplete tightening and completion of tightening of screw parts, which is configured such that an indicator member is held by a connecting piece of a washer.

Claims (1)

[Scope of utility model registration request] A washer with a substantially U-shaped cross section, which has an opening in the center of the upper and lower plates through which the shaft of the screw component is inserted, and connects a part of the outer periphery of the upper and lower plates with a connecting piece that projects outside the seat surface of the screw component. A marker member is attached to the connecting piece of the washer, and an elastic synthetic resin ring is interposed between the upper and lower plates of the washer, the outer diameter of which is at least larger than the bearing surface of the threaded part, and the inner diameter of which is approximately equal to the thickness of the shaft of the threaded part. The washer and ring are compressed by tightening the screw parts, and when a substantially specified torque is reached, the ring is broken at the portion where the overlapping upper and lower plates of the washer are located, and the indicator member is attached to the connecting piece of the washer. A device for indicating completion of tightening and completion of tightening of screw parts configured to hold the screw parts.