JP2005163968A - Structure of screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a screw, whereby it is possible, without using a special tool, to remove simply and easily a screw of which the tool receiving part formed by a groove or a slot for receiving a tool to rotate a screw main body, such as a cross slot formed on a screw head part, is damaged. <P>SOLUTION: In the screw composed of a shaft part 3 having a screw part 2 on its outer peripheral face, and the screw head part 5 having the cross slot 4 for receiving the tool to rotate the screw main body 1 on one end part of the shaft part 3, a screw slot 6 opened at its outer end, and reaching the shaft part at its inner end to be extended in the screw axial direction is formed on a central part of the cross slot 4 of the screw head part 5, and a tightening direction of a second screw 7 screwed in the screw slot 6 and a tightening direction of the screw part 2 are opposite to each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a screw structure that can be removed even if a tool receiving portion made of either a groove or a hole for receiving a tool for turning a screw main body such as a cross hole formed in a screw head is crushed.

  Conventionally, as a method of removing a screw whose cross hole in the screw head is crushed, a tapping screw or a counter-rotating bit provided with a drill and a hook is used to insert a guide hole into the cross hole in the crushed screw head. There has been proposed a method of removing a screw whose cross hole has been crushed by the frictional resistance at the time of drilling and the resistance of the hook (see, for example, Patent Document 1).

As another method, drill a pilot hole in the cross hole of the crushed screw head with a small diameter drill, bite the tip of the screw removal bit having the left screw extraction screw part into the pilot hole, A method has been proposed in which a screw whose cross hole is crushed in the left direction is rotated and extracted (see, for example, Patent Document 2).
JP 2001-162552 A (page 2-3, FIG. 1) JP 2001-260047 A (page 2, FIG. 1)

  In the conventional method of removing a screw with a crushed hole in the screw head, it is necessary to use a special tool for making a hole for removing the screw with a crushed hole in the screw head. However, there is no other method to use, and there is a problem that it is applied to versatility.

  Furthermore, when making a hole for removal to the cross hole of the screw head that has been crushed using a special tool as described above, a fine shaving is generated, and this fine shaving is in the precision electronic device main body etc. There was a risk that it would become a factor in the occurrence of breakdowns. In addition, this conventional method requires a hole to be removed in the cross hole of the crushed screw head, so depending on the screw material, a large torque is required and a special tool is turned by hand. In some cases, the screw cannot be removed easily.

  The present invention has been made in view of such problems of the conventional method of removing a screw with a crushed hole in a screw head, and the object of the present invention is without using a special dedicated tool. Let's provide a screw structure that can easily and easily remove a screw with a crushed tool receiving part consisting of either a groove or a hole for receiving a tool for turning a screw body such as a cross hole formed in the screw head It is what.

  In order to achieve the above object, in the screw structure of the present invention, a shaft portion having a screw portion formed on the outer peripheral surface, and a groove or a groove for receiving a tool for turning the screw main body at one end portion of the shaft portion. In a screw having a screw head formed with a tool receiving portion consisting of any of the holes, the outer end opens at the center of the tool receiving portion of the screw head and the inner end reaches the shaft portion, and the screw axial direction The extending screw hole is provided, and the tightening direction of the second screw screwed into the screw hole and the tightening direction of the screw portion are opposite to each other.

  Moreover, the said screw hole can also be comprised by the several screw hole from which the diameter of a hole differs.

  Furthermore, the screw hole may be constituted by a plurality of screw holes having different threading pitches and hole diameters.

  The screw structure of the present invention has the following effects.

  It is possible to easily remove a screw with a crushed tool receiving part consisting of either a groove or a hole for receiving a tool for turning a screw body such as a cross hole formed in the screw head without using a special dedicated tool. became.

  Screw the second screw into the screw hole provided in the center of the tool receiving part on the screw head, and turn the second screw in the tightening direction to reduce the screw whose tool receiving part on the screw head is crushed. It can be removed easily and reliably with torque.

  A screw hole that has been threaded in advance is provided in the center of the tool receiving part on the screw head, so that when the screw that the tool receiving part on the screw head is crushed is removed, the screw is secondly screwed into the screw hole. Even so, no fine metal shavings are generated. Therefore, there is no need to remove the shavings and to check whether the shavings remain attached to the precision electronic device, and prevent electrical failures caused by metal shavings. be able to.

  A shaft portion having a screw portion formed on the outer peripheral surface, and a screw head having a tool receiving portion formed of either a groove or a hole for receiving a tool for turning the screw main body at one end portion of the shaft portion. In the screw, a screw hole extending in the screw axis direction with an outer end opened at the center of the tool receiving portion of the screw head and the inner end reaching the shaft portion is provided, and a second screwed into the screw hole is provided. A screw structure in which the screw tightening direction and the screw tightening direction are opposite to each other.

  FIGS. 1A and 1B are a cross-sectional view and a plan view showing a first embodiment of a screw structure according to the present invention. FIG. 2 is a cross-sectional view for explaining the screw removal operation of the first embodiment shown in FIG.

  In the first embodiment of the present invention shown in FIGS. 1 (a) and 1 (b), reference numeral 1 denotes a screw main body, and a screw portion 2 of a right-hand screw (clockwise tightened) is provided on the outer peripheral surface. The formed shaft portion 3 and a screw head 5 having a cross hole 4 for receiving a plus driver of a tool for turning the screw body 1 are provided at one end of the shaft portion 3.

  Further, a screw hole 6 having an outer end opened and an inner end reaching the shaft portion 3 and extending in the screw axis direction is provided at the center of the cross hole 4 of the screw head 5. The inner diameter of the screw hole 6 is formed so as not to affect the use of a Phillips screwdriver. Further, the screw hole 6 is configured such that a second screw 7 of a left screw (turned and tightened counterclockwise) can be screwed therein. Therefore, the tightening direction of the second screw 7 screwed into the screw hole 6 and the tightening direction of the screw portion 2 provided in the shaft portion 3 are provided in opposite directions.

  Next, based on FIG. 2, a method of removing the screw body 1 in which the cross hole 4 of the screw head 5 is crushed from the screwed member 8 will be described. First, as shown in FIG. 2, the second screw 7 is screwed into the screw hole 6 provided in the crushed cross hole 4 while being rotated counterclockwise. Even after the second screw 7 is completely screwed into the screw hole 6, if a counterclockwise rotational force is continuously applied to the second screw 7, the shaft portion 3 provided with the screw hole 6 is moved to. A large rotational force in the left direction is transmitted, and the screw body 1 rotates in the left direction, that is, in a direction in which the tightening state is loosened, so that the screw body 1 can be reliably removed from the member 8 that is screwed.

  FIG. 3A is an explanatory view showing a second embodiment of the screw structure according to the present invention.

  The second embodiment of the present invention shown in FIG. 3A is formed by giving a plurality of inner diameters of the screw holes 6 provided in the screw head 5. The screw main body 1 shown in FIG. 3A is provided with a screw hole 9 having a large inner diameter on the near side near the screw head 5 and a screw hole 10 having a small inner diameter on the back side.

  The second screw 12 having a large diameter of the shaft portion 11 or the second screw 14 having a small diameter of the shaft portion 13 can be selected and used according to the situation to the screw holes 9 or 10 having different inner diameters. As a result, it is possible to widen the range of use of the second screw used when removing the screw body 1 in which the cross hole 4 of the screw head 5 is crushed.

  FIG. 3B is an explanatory view showing a third embodiment of the screw structure according to the present invention.

  In the third embodiment shown in FIG. 3B, a plurality of screw holes 6 provided in the screw head 5 have a plurality of inner diameters, and screw parts having different pitches are provided in the screw holes having different inner diameters. 16 is provided.

  First, a screw portion 15 having a large inner diameter and a fine threading pitch (dense) is provided on the front side close to the screw head 5, and a screw portion 16 having a small inner diameter and a rough threading pitch is provided on the back side. .

  On the other hand, as shown in FIG. 3B, the second screw 19 is provided with a screw portion 18 having a large diameter and a fine threading pitch (dense) of the shaft portion 17, and is screwed into the screw portion 15 of the screw hole 6. It is configured to enter. The second screw 22 is configured to be provided with a screw portion 21 having a small diameter of the shaft portion 20 and a rough threading pitch and screwed into the screw portion 16 of the screw hole 6. As described above, the second screw 19 or the second screw 22 having a different diameter and threading pitch can be selected and used according to the situation, and the second screw 19 used for removing the screw body 1 in which the cross hole 4 is crushed is used. It became possible to expand the range of use of the No. 2 screw.

  In each of the above-described embodiments, the thread portion provided on the shaft portion is threaded clockwise (turned clockwise to tighten) and the second screw is threaded leftward (counterclockwise to tighten). As described above, the same effect can be obtained when the thread portion provided on the shaft portion is threaded leftward and the second screw is threaded rightward.

  In each of the above-described embodiments, the case where a cross screw hole for a Phillips screwdriver is provided in the screw head of the screw main body or the head of the second screw has been described. A groove, a hexagonal hole, or the like may be formed. By forming in this way, it becomes possible to turn the screw body or the second screw in a predetermined direction using a tool such as a flathead screwdriver or a hexagon stick wrench.

  As shown in FIG. 4A, during the operation of removing the screw body 1 from the screwed member 8, the cross hole of the second screw 7 screwed into the screw hole of the screw head 5 is crushed. Even if a situation occurs, since the screw head of the second screw 7 protrudes, the screw body 1 can be removed by sandwiching and pulling out the screw head of the second screw 7 with a tool such as pliers. It can be removed from the screwed member 8.

  Further, as shown in FIG. 4B, even when the screw body 1 or the second screw 7 is in a so-called “screw idiot” state, a relatively long shaft as the second screw 7 in advance. Since the screw head of the second screw 7 can be protruded by using a screw having a portion, the second screw 7 is lifted by using a tool such as a screwdriver. However, the screw body 1 can be removed by rotating the second screw 7 in the tightening direction.

It is sectional drawing and a top view which show the 1st Example of this invention. It is explanatory drawing which shows the case where it removes from the member which screwed the screw main body of 1st Example of FIG. It is explanatory drawing which shows the 2nd Example of this invention. It is explanatory drawing which shows the removal method when the cross hole of the 2nd screw used for this invention is crushed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw main body 2 Screw part 3 Shaft part 4 Cross hole 5 Screw head 6 Screw hole 7 Second screw 8 Screwed member 9, 10 Screw hole 11 Shaft part 12 Second screw 13 Shaft part 14 Second screw 15, 16 Screw part 17 Shaft part 18 Screw part 19 Second screw 20 Shaft part 21 Screw part 22 Second screw

Claims (3)

A shaft portion having a screw portion formed on the outer peripheral surface, and a screw head having a tool receiving portion formed of either a groove or a hole for receiving a tool for turning the screw main body at one end portion of the shaft portion. In the screw,
A screw hole extending in the screw axis direction with an outer end opening at the center of the tool receiving portion and an inner end reaching the shaft portion is provided, and the tightening direction of the second screw screwed into the screw hole is A screw structure characterized in that the screw portions are tightened in opposite directions.   The screw structure according to claim 1, wherein the screw hole includes a plurality of screw holes having different hole diameters.   The screw structure according to claim 1 or 2, wherein the screw hole is composed of a plurality of screw holes having different threading pitches and hole diameters.

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