JP2009108958A - Screw, connecting/fixing method, and repair method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw capable of connecting/fixing objects to be connected which are horizontally arranged only by work from the upper side, a connecting/fixing method using the screw, and a repair method using the connecting/fixing method, for improving user convenience. <P>SOLUTION: This screw is formed with a screw head at one end of a shaft having a screw thread formed around an outer periphery. A neck portion as a connecting portion of the screw head to the shaft is formed larger in diameter than that of the shaft, and the surface of the neck portion on the side of the shaft is formed into an inverse tapered shape with an outer periphery rather than an inner periphery projected toward the end of the shaft. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to, for example, a screw capable of connecting and fixing an object to be connected and fixed, a connecting and fixing method using the screw, and a repair method using the connecting and fixing method.

  Conventionally, various types of screws have been proposed (see Patent Documents 1 and 2). These screws superimpose plate-like objects and penetrate and screw into the overlapped portions, thereby connecting and fixing the objects. However, in this method, the two objects cannot be connected and fixed in an aligned state without overlapping.

  On the other hand, a method using a bolt which is a kind of screw has been proposed as a method for connecting and fixing objects arranged without being overlapped (see Patent Documents 3 and 4). In any of these methods, a connection target is connected by sandwiching a connection part with a bolt and a nut.

  Here, for example, when a crack occurs in the bottom of a ship or a submarine, it is required to connect and fix the left and right sides of the cracked part when the cracked part is filled with a filler. This is necessary for preventing cracks from expanding during repair work.

  However, in the above-described method using bolts and nuts, it is necessary to work from both the front and back sides, and it has been impossible to connect and fix only from the front side. For this reason, it was not possible to connect cracks that occurred on the bottom of the ship or submarine.

Japanese Patent Laid-Open No. 9-125377 Japanese Patent Laid-Open No. 9-42257 Japanese Utility Model Publication No. 53-56282 Japanese Utility Model Publication No. 49-28914

  In view of the above-described problems, the present invention provides a screw capable of connecting and fixing side-by-side connection objects only from the front side, a connection fixing method using the screw, and a repair method using the connection fixing method. It is intended to improve the convenience for users.

  The present invention is a screw in which a screw head is provided at one end of a shaft having a screw thread on the outer periphery, and a neck portion that is a connecting portion of the screw head and the shaft is formed to be larger in radius than the shaft. The shaft is a screw having a tapered surface in which the outer periphery protrudes from the inner periphery toward the tip of the shaft.

  According to this invention, it is possible to connect and fix the objects to be connected side by side only by work from the front side.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a front view of the screw 1, and FIG. 2 shows an enlarged longitudinal end view of the AA portion in FIG.
The screw 1 includes a screw head 2, a neck 3, and a shaft 4 arranged in this order in the vertical order.

  The screw head 2 is formed in a hexagonal column shape having a hexagonal cross section. The screw head 2 is formed such that the radius from the axis C to the outer periphery is the largest compared to the other neck 3 and the shaft 4. A hexagon wrench or the like is fitted into the screw head 2 to perform a screwing operation.

  The neck 3 is formed in a cylindrical shape having a circular cross section. The neck 3 is formed so that the radius from the axis C to the outer periphery 31 (see FIG. 2) is smaller than the screw head 2 and larger than the shaft 4. A constricted portion 32 processed into a concave shape is formed on the outer periphery of the neck 3 on the screw head 2 side slightly from the axial center.

  A connecting and fixing surface 33 is formed on the surface (lower surface) of the shaft 4 of the neck 3. The connecting and fixing surface 33 has the inner periphery of the screw head 2 receding toward the hook by an angle θ2 rather than perpendicular to the axis C. That is, the connecting and fixing surface 33 of the neck 3 is formed such that the outer periphery 31 protrudes from the inner periphery to the shaft 4. The protruding portion 35 and the connection fixing surface 33 are formed continuously over the entire circumference of the neck 3. Further, the height of the protruding portion 35 in the direction of the axis C is the same over the entire circumference. That is, when the axis C is vertical, the protruding portion 35 is horizontal over the entire circumference. In this embodiment, the angle θ2 is formed at an angle greater than 0 degree and less than 45 degrees.

The shaft 4 is provided with a base 41 formed in a cylindrical shape with a circular cross section at the neck 3, and a thread 40 is formed at the tip 5 from the base 41.
The base 41 is formed such that the radius from the axis C to the outer periphery is smaller than the neck 3, smaller than the thread 40, and larger than the thread 40 valley. Since the base 41 has an outer periphery parallel to the axis C, an angle θ1 formed by the outer periphery and the coupling fixing surface 33 is formed at an acute angle.

The screw thread 40 is formed in a trapezoidal shape in which an outer peripheral surface 44 parallel to the axis C is provided at the apex portion. The neck side slope 43 of the screw thread 40 is formed so that the inner circumference is inclined toward the tip 5 rather than the outer circumference. For this reason, the upper end of the outer peripheral surface 44 slightly protrudes toward the neck 3 from the valley portion of the screw thread 40. Therefore, the angle θ3 formed by the neck-side inclined surface 43 and the outer peripheral surface 44 is an acute angle. The neck side inclined surface 43 may be formed horizontally with respect to the vertical axis C, and the angle θ3 may be formed at 0 degree.
The tip side slope 45 of the tip of the screw thread 40 is formed so that the inner circumference is inclined toward the tip 5 from the outer circumference.
The thread 40 is continuously formed in a spiral from the base 41 to the tip 5.

  Next, together with the explanatory views of FIG. 3 and FIG. 4, the first connection object 60A and the second connection object 60B are connected using the screw 1 described above while the surfaces 67A and 67B are arranged side by side on the same plane. A method of fixing will be described.

  As shown in the partially longitudinally enlarged explanatory view of FIG. 3, female screw holes 61 </ b> A and 61 </ b> B are formed in the first connection object 60 </ b> A and the second connection object 60 </ b> B in the gap portions that are arranged side by side. ing. In the female screw holes 61A and 61B, inclined surfaces 62A and 62B, in which the inner periphery is inclined toward the surface (upward in the drawing) rather than the outer periphery, are formed at positions close to the opening, respectively, and the inclined surfaces 62A and 62B are formed. Convex portions 63A and 63B are formed at the apex portion of each. And female screw parts 64A and 64B are formed in the back from these convex parts 63A and 63B. The back side surfaces of the threads provided in the female screw portions 64A and 64B are formed as inclined surfaces 65A and 65B in which the inner periphery is inclined from the outer periphery toward the back (downward in the drawing).

  When the screw 1 is screwed into the female screw holes 61A and 61B, as shown in the longitudinal enlarged explanatory view of FIG. 4A, the screw 1 advances to the back while the screw thread 40 is engaged with the female screw portions 64A and 64B. .

  When the screwing proceeds to the maximum extent, the connection fixing surface 33 provided on the neck 3 of the screw 1 is connected to the first connection object 60A and the second connection object 60B as shown in the longitudinally enlarged explanatory view of FIG. Abutting against the inclined surfaces 62A and 62B provided in

  Accordingly, the protruding portion 35 provided on the neck 3 of the screw 1 is in a state where it has bite into the back (downward in the drawing) from the convex portions 63A and 63B formed on the first connection object 60A and the second connection object 60B. Become.

  At this time, the neck side inclined surface 43 provided on the screw thread 40 of the screw 1 and the inclined surfaces 65A and 65B provided on the first connection object 60A and the second connection object 60B abut. Therefore, the upper end portion of the outer peripheral surface 44 of the screw thread 40 is positioned more on the surface (upward in the drawing) than the tip portions of the female screw portions 64A and 64B formed on the first connection object 60A and the second connection object 60B. Then, it will be in a state where it has devoured.

  If it progresses to this state, even if it is going to space | separate 1st connection target object 60A and 2nd connection target object 60B, engagement of the protrusion part 35 and convex part 63A, 63B, and the thread 40 and female thread part 64A, 64B. It cannot be separated by engagement. Accordingly, the first connection object 60A and the second connection object 60B are connected and fixed by the screw 1 in a state where they are arranged side by side.

  As described above, the first connection object 60A and the second connection object 60B can be connected and fixed in a side-by-side state using only the screw 1 instead of the configuration of bolts and nuts.

  Accordingly, the connection and fixing can be performed only from the surface side of the first connection object 60A and the second connection object 60B, and the connection and fixation can be performed even in a situation where the operation on the back side is impossible.

  In particular, since the connection fixing surface 33 and the protruding portion 35 formed on the neck 3 of the screw 1 are continuously formed over the entire circumference, the durability is strong, and the first connection object 60A and the second connection object. 60B can be firmly connected and fixed.

  Moreover, since the height (radial length from the base 41 to the outer periphery 31) of the connection fixing surface 33 is higher than the height of the screw thread 40 (radial length from the valley of the screw thread 40 to the peak), The first connection object 60A and the second connection object 60B can be firmly connected and fixed even by fixing only one round. Moreover, since the thread 40 engages with the first connection object 60A and the second connection object 60B in a spiral manner, it can be firmly engaged without being crushed.

  In addition, since the screw head 2 is hexagonal, the operation part is not crushed like when turning with a Phillips screwdriver in the cross hole, and it can be screwed in firmly and firmly, and the connecting fixing surface of the neck 3 33, the inclined surfaces 62A and 62B of the first connection object 60A and the second connection object 60B can be strongly pressed.

  For example, when a crack occurs in a submarine or the bottom of a ship, the screw 1 can be screwed into the cracked portion to connect and fix the objects to be connected to the left and right sides of the crack. Thereby, the expansion of a crack can be prevented. Therefore, when repairing a crack by filling with a filler or the like, it is possible to prevent the crack from expanding during the repair and hinder the repair work, and the repair work can be performed accurately in a stable state.

  The screw 1 may be provided with a through hole 50 penetrating from the tip 5a to the screw head 2 with a sharp tip 5a as in the screw 1a of the second embodiment shown in FIG. . In this case, the through-hole 50 is preferably formed as a hole that penetrates from the slope portion of the tip portion 5a to the top of the screw head 2 through the axis C. In addition, the through hole 50 is preferably formed with a female screw portion 52 at least at the screw head 2 portion.

  By forming the tip portion 5a sharply in this way, the screw 1a can be screwed in while drilling, even if the female screw holes 61A and 61B are not formed in advance as in the first embodiment. . Then, if the screw 1a is screwed in with a strong force, the projecting portion 35 bites into the surface of each connection object, whereby the surface of each connection object is deformed and fitted into the projecting portion 35, thereby realizing connection fixing. can do. Thereby, the operation | work which forms female screw hole 61A, 61B in advance can be abbreviate | omitted, and the convenience can be improved.

  Further, since the through hole 50 is formed, the liquid can pass through the through hole 50. Therefore, when the screw 1a is screwed into the submarine or the crack of the ship bottom during operation to prevent the crack from expanding, it is possible to prevent the screw 1a from being screwed in due to strong water pressure. That is, as shown by the arrow in FIG. 5A, the screw 1a can be screwed in by passing water through the through hole 50 to reduce or avoid the water pressure.

Then, after the connection object is connected and fixed with the screw 1a, a separate small screw 90 may be screwed into the female screw portion 52 of the through hole 50 as shown in FIG. By inserting the small screw 90, the through hole 50 can be closed, and subsequent passage of water can be prevented.
The screw 1a of the second embodiment can also obtain the same operational effects as the screw 1 of the first embodiment.

In correspondence between the configuration of the present invention and the above-described embodiment,
The neck portion of the present invention corresponds to the neck 3 of the embodiment,
Similarly,
The shaft tip corresponds to the tip 5,
The neck surface of the neck corresponds to the connecting and fixing surface 33,
The female screw corresponds to the female screw part 52,
The first object corresponds to the first connected object 60A,
The second object corresponds to the second connected object 60B,
The surface corresponds to the inclined surfaces 62A, 62B,
A separate screw corresponds to the machine screw 90,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

The front view of a screw. The expanded longitudinal section of AA part. Explanatory drawing of how to use the screw. Explanatory drawing of how to use the screw. Explanatory drawing of the screw of Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a ... Screw, 2 ... Screw head, 3 ... Neck, 4 ... Axis, 5 ... Tip, 33 ... Connection fixing surface, 40 ... Screw thread, 50 ... Through-hole, 52 ... Female thread part, 60A ... 1st connection object Object, 60B ... second connection object, 62A, 62B ... inclined surface, 90 ... machine screw

Claims (7)

A screw provided with a screw head at one end of a shaft having a thread on the outer periphery;
Forming a neck portion which is a connecting portion of the screw head and the shaft with a radius larger than that of the shaft;
A screw in which the shaft surface of the neck portion is formed in a reverse taper shape with the outer periphery protruding from the inner periphery toward the shaft tip. The screw head flange surface of the screw thread provided on the shaft is formed at a right angle to the shaft, or is formed in a reverse taper shape with the outer periphery protruding from the inner periphery toward the screw head. Screw. The screw according to claim 1 or 2, wherein the shaft tip is sharply formed. The screw according to claim 1, 2, or 3, wherein a through-hole penetrating from the tip portion of the shaft to the screw head is provided in the shaft. The screw according to claim 4, wherein a female screw for allowing a separate screw to be screwed is formed on an inner peripheral surface of the through hole. In the part where the first object and the second object to be connected and fixed are in contact or in proximity
Screwing the screw according to any one of claims 1 to 5,
The neck portion shaft bite into the surface of the first object and the second object,
A connection fixing method for connecting and fixing the first object and the second object so as not to be separated. One of the cracked parts of the object is the first object, the other is the second object,
After connecting and fixing the first object and the second object by the connection and fixing method according to claim 6,
A repair method for filling the cracked portion with a filler and repairing.

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