JP6187953B1 - Structure to prevent loosening of nuts tightened on bolts - Google Patents

Abstract

An object of the present invention is to reliably prevent loosening of a tightening nut. A tightening nut 6 is formed in a bag shape having a thick lid portion 7 that sandwiches the upper end surface 3 of a bolt 1 and penetrates the lid portion at a position offset to the periphery of the upper surface of the lid portion. After the bag-like tightening nut 6 is firmly tightened, a pin 10 with a cutting edge is inserted into the straight hole 8 on the top surface of the lid 7, and a square hole 12 of this pin with a cutting edge is provided. Insert a square screwdriver pin attached to the tip of the rotating shaft of the electric drill, rotate the pin with a cutting blade, and rotate the pin with the angled cutting blade 14 at the lower end to an annular position at a position offset to the periphery of the upper end surface 3 The groove 4 is cut, and the angle cutting blade is cut into the groove, thereby fixing the bag-like tightening nut to the bolt and holding the bite. 15 and press the pin 10 with a cutting blade strongly by screwing it. And ensuring the fixation of the bolt 1 of the bag-like fastening nut 6, to prevent the loosening by external force. [Selection] Figure 1

Description

  The present invention is a method for preventing loosening of a nut tightened in a coarse screw bolt that requires a strong tightening force.

  As a method of fixing the nut to the bolt to prevent loosening, there is a method of opening a common hole that penetrates the nut and bolt, and fixing by pushing the split pin here, but this drilling is sometimes troublesome because it may be done on site In addition, there is a disadvantage that it does not match when the nut is tightened again after unscrewing, and the nut used when pressing the rolling bearing is a fine screw, it can not withstand a heavy load, and the shaft has a groove Since it requires processing, it is unsuitable for use in coarse screw bolts that are widely used, and there is also a double nut type locking nut for increasing the frictional force of the screw surface, but this effect is unknown.

  According to the present invention, the loosening of the tightening nut is ensured by causing the cutting edge of the pin with the cutting edge of the bag-like tightening nut to bite into the upper end surface of the bolt of the coarse thread that requires a strong tightening force. Try to stop.

  In the structure for preventing the nut from being tightened to the bolt, the bolt 1 is fixed to the lower member 19 and passes through the upper member 17 placed on the lower member, and is tightened to the bolt from above the upper member. At least one straight hole 8 penetrating the lid portion is provided at a position offset from the periphery of the upper surface of the lid portion, having a bag-like shape provided with a lid portion 7 that covers the upper end surface 3 of the bolt 1. The tightening nut 6 is fitted to the straight hole, and the upper end surface 11 is provided with a square hole 12 into which a square driver pin attached to the distal end of the rotary shaft of the electric drill is inserted. The cutting blade includes at least one pin 10 with a cutting edge formed so that several arranged angled cutting blades 14 protrude, and a bag-like locking nut 15 screwed onto the tightening nut 6. By means of the angled cutting blade 14 with a pin, An annular groove 4 is cut at a position near the periphery of the upper end surface 3 of the thread, and the angled cutting blade 14 is bitten into the groove 4, and the bag-shaped locking nut 15 is used to 10 is a structure for preventing a nut from loosening.

  By carrying out the present invention, medium and large diameter nuts can reliably withstand severe vibrations, and the screw thread surfaces of bolts are protected against rainwater and muddy water. It is possible.

As an example of an embodiment of the present invention, a vertical cross-sectional view of a state in which a bag-like fastening nut is tightened on a bolt to prevent loosening Plan view of FIG. Side view of FIG. XX sectional view of FIG. Enlarged view of the longitudinal section of the pin with a cutting edge incorporated in FIGS. 1, 2 and 3 Plan view of FIG. Side view of FIG.

In the structure for preventing loosening of the nut tightened on the bolt, the shape of the tightening nut 6 is a bag-like shape provided with a thick lid portion 7 that crawls the upper end surface 3 of the bolt 1 and is offset to the periphery of the upper surface of the lid portion. 1 or several straight holes 8 penetrating the lid portion are provided at the position. When two straight holes are provided, a straight hole is provided at an opposite position on the upper surface of the lid portion. 3 and 4 show the case where only one straight hole is provided, and the top of the pin with a cutting edge into which the pin 10 with a cutting edge is inserted so as to rotate smoothly in close contact with the straight hole. A square hole 12 is provided in the end surface 11 and several angled cutting blades 14 arranged in an annular shape are formed on the lower end surface 13 so as to protrude. The angled cutting blades are hardened and sharply polished. Yes. It is desirable to magnetize in order to prevent the pin with the cutting blade from falling off during the grace period. The bolt 1 is fixed to the lower member 19, the upper member 17 is placed therethrough, and the bag is tightened from above. After the nut 6 is firmly tightened, a pin 10 with a cutting blade is inserted into the straight hole 8 on the top surface of the lid 7, and the square shape is attached to the end of the rotary shaft of the electric drill in the square hole 12 of this pin with cutting blade Insert a screwdriver pin, rotate the pin with cutting edge, and cut the annular cutting groove 4 at a position offset to the periphery of the upper end surface 3 of the bolt with the angled cutting edge 14 at the lower end, and the angled cutting edge in this groove As a result, the bag-like tightening nut is fixed to the bolt.
FIG. 4 shows an annular groove formed on the upper end surface of the bolt cut by the cutting pin. When the bag-like clamping nut is repeatedly attached and detached, the number increases each time. There is no hindrance to the cutting effect.

  A male screw 9 is provided on the outer periphery of the lid portion 7 of the bag-like fastening nut, and a female screw 16 of a bag-like loosening prevention nut 15 is screwed into this. The pin 10 is pressed to ensure the fixing of the bag-like fastening nut 6 to the bolt 1 and to prevent the bag-like fastening nut 6 from being loosened by an external force such as vibration. The screw connection of the male screw 9 of the nut is a function that only presses the pin with a cutting edge, so that a large force is not required, so that it can be a fine screw and can be tightly fitted. There is no need to use a washer or the like, and it can sufficiently withstand vibration.

  Since the bolt tightening screw is hermetically sealed by a bag-like tightening nut, a pin with a cutting edge, and a bag-like loosening prevention nut, there is an advantage that rusting of the screw surface hardly occurs without intrusion of rainwater and muddy water.

DESCRIPTION OF SYMBOLS 1 ... Bolt 2 ... Bolt tightening screw 3 ... Bolt upper end surface 4 ... Toroidal cut groove 5 on the upper end surface ... Implant screw 6 ... Bag-shaped tightening nut 7 ... Lid of the bag-shaped clamping nut 8 ... Direct hole 9 of the bag-shaped clamping nut lid 9 ... Male screw of the bag-shaped clamping nut lid 10 ... Pin 11 with cutting blade · Upper end surface of pin with cutting edge 12 ··· Square hole 13 at upper end surface of pin with cutting blade · · · Lower end surface of pin with cutting blade 14 · · · An annular chevron 15 at the lower end surface of pin with cutting blade ...... Bag-shaped locking nut 16 ...... Bag-shaped locking nut 17 female screw 17 ... Upper member 18 ... Upper member bolt hole 19 ... Lower member 20 ... Lower member female screw

Claims (1)

  In the structure for preventing the loosening of the nut tightened on the bolt, the bolt (1) passing through the upper member (17) fixed to the lower member (19) and placed on the lower member, and the upper member from above It has a bag-like shape with a lid (7) that is fastened to a bolt and covers the upper end surface (3) of the bolt (1), and the lid is located at a position offset from the periphery of the upper surface of the lid. A tightening nut (6) provided with at least one straight hole (8) penetrating the portion, and a square screwdriver fitted to the straight hole and attached to the top end surface (11) of the rotary shaft tip of the electric drill A square hole (12) into which a pin is inserted is provided, and at least one pin with a cutting edge (10) formed so that several angled cutting edges (14) arranged in an annular shape on the lower end surface (13) protrude. ) And a bag-like locking nut (15) screwed onto the clamping nut (6). An annular cut groove (4) is cut at a position offset to the periphery of the upper end surface (3) of the bolt by the angle cutting blade (14) of the pin with cutting edge, and the cutting groove ( A nut locking structure characterized in that the angle cutting blade (14) is bitten into 4) and the pin (10) with a cutting blade is pressed by the bag-shaped locking nut (15).

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