JPH09189319A - Male screw member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a male screw having a locking function capable of increasing not only pullout torque but also return torque. SOLUTION: Recessed lines 4 in a shape removing top parts and side surfaces of thread ridges and thread grooves in a band shape in the bolt longitudinal direction are provided along a plural number of the thread ridges 2. Angles α, β of a corner edge part of a normal screw surface 2a and the recessed lines 4 at the side surfaces of the thread ridge 2 are 90 deg.<α<β<180 deg.. A sealant consisting of synthetic resin or rubber is filled in the recessed lines 4. Parts of the recessed lines 4 are in the same shape as a part of the normal screw surface 2a by filling this sealant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a male screw member such as a bolt and a basic screw for a pipe, and more particularly to a detachable male screw member having a locking function.

[0002]

2. Description of the Related Art In order to prevent loosening of tightened bolts,
Adhesive may be injected into the threaded surface, but this does not allow the bolt to be removed after the adhesive has hardened.

A bolt having a male thread surface coated with nylon resin is commercially available as a detachable locking bolt. The nylon resin is interposed between the male screw surface and the female screw surface and presses both to prevent the bolt from loosening.

[0004]

Although the escape torque can be increased by providing such a nylon resin coating, the return torque hardly increases.

That is, the torque (return torque) required when the tightened bolt is first swung in the loosening direction is hardly increased. However, the torque (escape torque) required to turn the bolt that has started to turn once is increased by the compressive force of the nylon resin coating.

An object of the present invention is to provide a male screw member having a locking function that can increase not only the escape torque but also the return torque.

[0007]

The male screw member of the first invention is a male screw member in which threads are spirally provided,
Over a plurality of adjacent screw threads, a groove is formed by removing the top and side surfaces of the screw thread and the bottom of the screw groove in a strip shape in a direction parallel to the axis of the male screw member. It is characterized in that it is filled with a sealing material made of resin or rubber.

In the male screw member of the second invention, in the male screw member in which the screw thread is spirally provided, the side surface of the screw thread and the bottom of the screw groove are removed along the spiral direction of the screw thread. It is characterized in that a concave groove is provided and a sealing material made of synthetic resin or rubber is filled in the concave groove.

In the male screw member of the first and second inventions, among the corner edge portions of the regular threaded surface and the concave line on the side surface of the screw thread, the corner edge on the rear end side in the loosening rotation direction of the male screw member. The return torque and the escape torque are increased by the portion hitting the female screw surface. Moreover, the escape torque is increased by the sealing material filled in the groove.

In the male screw member according to the first aspect of the invention, it is preferable that a plurality of recessed lines are provided in the circumferential direction of the male screw member.

Further, in the male screw member of the first invention, the crossing angle between the regular screw surface on the side surface of the screw thread and the sloped surface near the corner edge of the recess is such that the cross direction of the male screw member is in the loose rotation direction. Angle α on the end side and angle β on the front end side in the loosening rotation direction
It is preferable that all of the above are larger than 90 °, and the angle α is smaller than the angle β.

By making the angle α close to 90 ° in this way, the return torque becomes extremely high. Also, β
By making the obtuse angle larger than α, it is possible to suppress an increase in the torque required to rotate the male screw member in the tightening direction.

The male screw member of the second invention is suitable for application to a pipe screw.

In any of the male screw members of the first and second inventions, the sealing material filled in the groove has the same screw surface shape as that of a general (conventional) male screw member having no such groove. Is preferably formed so that the male screw member can be smoothly screwed into the female screw.

Even if the sealing material of the male screw member of the first invention is omitted, a male screw member having a high return torque can be obtained.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 9 show the first invention (claims 1 to 3).
3 shows a bolt as a male screw member according to the embodiment of FIG.

The bolt 1 has a spiral thread 2 and a thread groove 3. A plurality of threads 2 are provided with recessed ridges 4 having a shape in which the top and side surfaces of the threads 2 and the thread groove 3 are removed in a strip shape in the bolt longitudinal direction.

In this embodiment, four recessed lines 4 are provided in the circumferential direction of the bolt 1.

As shown in FIG. 5, in the AA cross section and the BB cross section which are parallel to the axial center line of the bolt 1 and whose normal line passes through the axial center line of the bolt 1, on the side surface of the screw thread 2. The crossing angles α and β between the regular threaded surface 2a and the inclined surface near the corner edge of the recessed line 4 are both larger than 90 °. Further, the angle α on the rear end side in the loosening rotation direction of the bolt 1 is closer to 90 ° than the angle β on the front end side in the loosening rotation direction. That is, 90 °
<Α <β <180 °.

The angle α is preferably 93 ° to 120 °, more preferably 100 ° to 105 °. The angle β is 110 ° to 1
60 °, especially 130 ° to 135 °, is preferable.

As shown in FIGS. 6 to 9, the recess 4 is filled with a sealing material 5 made of synthetic resin or rubber.
By filling with this sealing material 5, the location of the recessed ridge 4 also has the same shape as the regular screw surface 2a portion and the regular screw groove 3 portion.

The nut 1 is attached to the bolt 1 thus constructed.
When the screw is screwed in, the return torque and the escape torque when the bolt 1 or the nut 6 is rotated in the loosening direction are remarkably high because the edges of the nut 6 contact the female thread surface of the nut 6 Becomes

Further, since the sealing material 5 is in close contact with the female screw surface, the escape torque becomes sufficiently high.

In FIGS. 1 to 9, both side surfaces of the screw thread 2 are removed evenly to form the concave streak 4. However, as shown in FIGS. 10 and 11, the female screw surface of the tightened nut is formed. Concave line 4 so that the side of the side that strongly adheres to
A may be formed.

12 and 13 show the second invention (claim 4).
5) Pipe screw 7 as a male screw member according to the embodiment of 5)
It shows. As shown in FIG. 12, this pipe screw 7
Is composed of a screw thread 8 and a screw groove 9, and has a taper shape having a smaller diameter toward the left in FIG. This pipe screw 7
Is engraved on the outer peripheral surface of the tip of the pipe, and is screwed into a female screw engraved on the inner peripheral surface of the end of a pipe (not shown) having a larger diameter.

In a range of a plurality of continuous threads of the screw thread 8, a recess 10 having a shape in which the side surface of the screw thread 8 and the bottom surface of the screw groove 9 are removed is provided. The groove 10 is filled with a sealing material 5 (not shown in FIGS. 12 and 13) to have the same appearance as a general (conventional) pipe screw without the groove 10.

Also in this pipe screw 7, the return torque and the withdrawal torque are remarkably increased by the contact of the corner edge 11 between the groove 10 and the regular thread surface 8a with the female thread surface. In addition, the sealing material of the groove 10 increases the escape torque.

In the present invention, fine hard particles may be mixed in the sealing material. By doing this,
When the hard particles are caught between the male screw surface and the female screw surface, both the return torque and the escape torque are significantly increased.

Since the above-mentioned recessed lines 4 and 10 are not provided at the tip of the bolt or the pipe, when screwing a nut or a pipe with a female screw into the bolt or the pipe, the first male screw and the female screw are inserted. Good connection with screws.

The recesses 4 and 10 are provided along a specific direction such as the extending direction of a specific side surface of the hexagonal head of the bolt or the extending direction of the tool engaging groove on the end surface of the bolt. preferable. In this way, it is easy to identify at which position on the circumferential surface of the bolt the recess is located.

In the above description, it is assumed that the recesses 4 and 4A are filled with the seal material 5, but in the present invention, even if the seal material 5 is omitted, a bolt having a high escape torque and a high return torque is provided. It

[0033]

As described above, according to the male screw member of the present invention, not only the escape torque but also the return torque can be remarkably increased.

[Brief description of the drawings]

FIG. 1 is a side view of an element body of a bolt according to an embodiment.

FIG. 2 is a front view of the element body of the bolt according to the embodiment (FIG. 1).
II-II line arrow view).

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

5 is a cross-sectional view taken along line AA and line BB of FIG.

FIG. 6 is a side view of the bolt according to the embodiment.

FIG. 7 is a front view of the bolt according to the embodiment (VII in FIG. 6).
-VII line arrow view).

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 8;

FIG. 10 is a side view of a bolt according to another embodiment.

FIG. 11 is a sectional view taken along the line XI-XI in FIG. 10;

FIG. 12 is a side view of the pipe screw according to the embodiment.

FIG. 13 is a sectional view taken along the line XIII-XIII of FIG.

[Explanation of symbols] 1 bolt 2,8 screw thread 3,9 screw groove 4,4A, 10 recessed ridge 5 sealing material 6 nut 7 pipe screw 11 corner edge

Claims (7)

[Claims] 1. A male screw member in which a screw thread is spirally provided, wherein a top portion and a side surface of the screw thread and a bottom portion of a screw groove are provided as an axial center line of the male screw member over a plurality of adjacent screw threads. A male screw member, characterized in that a groove is formed in a strip shape in a parallel direction, and the groove is filled with a sealing material made of synthetic resin or rubber. 2. The male screw member according to claim 1, wherein a plurality of the recessed strips are provided in a circumferential direction of the male screw member. 3. The crossing angle between the regular threaded surface on the side surface of the thread and the sloped surface near the corner edge of the groove is determined by the angle of intersection of the male threaded member on the rear end side in the loosening rotation direction. Both the angle α and the angle β on the front end side in the loosening rotation direction are larger than 90 °, and the angle α is smaller than the angle β. 4. A male screw member in which a screw thread is spirally provided, wherein a recessed line having a shape in which a side surface of the screw thread and a bottom portion of the screw groove are removed along a spiral direction of the screw thread is provided, A male screw member in which the groove is filled with a sealing material made of synthetic resin or rubber. 5. The male screw member according to claim 4, wherein the screw is a basic pipe screw. 6. The external thread shape of a thread and a groove at a portion filled with a seal material according to claim 1, wherein the shape of the outer surface of the seal material is a thread and a screw other than a location where the recess is provided. A male screw member having a regular screw thread and screw groove shape corresponding to the groove. 7. A male screw member in which a screw thread is spirally provided, wherein a top portion and a side surface of the screw thread and a bottom portion of a screw groove are formed as an axial center line of the male screw member over a plurality of adjacent screw threads. A male screw member characterized in that a recessed strip formed in a strip shape is provided in a parallel direction.