JPH0735812U - bolt - Google Patents

Abstract

(57) [Summary] [Structure] A rod shaft portion having a diameter larger than that of the male screw shaft portion and having no screw thread is coupled to the base portion of the male screw shaft portion, and the rod portion is connected to the base portion of the rod shaft portion. A bolt formed by connecting a head having a continuous scale-like uneven surface on the inner surface for tightening, which has a diameter larger than that of the shaft. [Effect] Even if the material to be fixed is hollow and is subject to compression and denting, it is possible to perform firm and secure tightening and fixing without causing damage or dents on the surface member and without spinning.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bolt, and more particularly to a bolt suitable for fixing various materials such as a hollow structural material such as a honeycomb material and a foamed sandwich panel that are easily compressed and dented.

[0002]

[Prior art]

 In the past, the bolt was simply composed of the male screw shaft portion and the head portion coupled to the base portion thereof.

Therefore, when a hollow structure material such as a honeycomb material or a material such as a foam sandwich panel which easily causes compression and denting is fixed by such a conventional bolt, it is strong from the outside to the inside due to the tightening. As a result of the application of force, it was unavoidable that the surface member of the material was damaged or dented at the head of the bolt or the joint surface with the nut.

Therefore, in order to prevent the occurrence of such a problem, it has been the actual situation that an intervening material such as a metal, which is a separate member, is inserted between the members to prevent an excessive inward tightening action. .

Further, since the conventional tightening inner surface of the bolt head is merely a flat surface, slippage during slipping operation is likely to occur, and as a result, a reliable tightening effect cannot be obtained. there were.

[0006]

[Problems to be solved by the device]

 In such an actual situation, the present inventor has conducted various studies to provide a bolt that can fix the material more reliably without causing damage or dent on the surface member without using a separate member. As a result, the present invention has been devised.

[0007]

[Means for Solving the Problems]

 That is, according to the present invention, a rod shaft portion having a diameter larger than that of the male screw shaft portion and having no screw thread is connected to the base portion of the male screw shaft portion, and the base portion of the rod shaft portion is larger than the rod shaft portion. The bolt is characterized in that a head having a continuous scale-like concavo-convex surface is formed continuously on the inner diameter and tightening inner surface.

Since the rod shaft portion in the present invention functions as a so-called spacer, the end surface on the screw shaft portion side is a flat surface, and the diameter thereof is such that the end surface has a male screw shaft portion. It should be smaller than the peak and protrude by 2 mm or more, and its length should correspond to the thickness of the material to be fixed.

Further, it is advantageous in terms of dispersibility of the tightening force to make the area of the tightening inner surface of the head as wide as possible. Further, it is preferable that the continuous scale-like uneven surface of the inner surface for tightening is a radial continuous scale. Incidentally, as in the conventional case, a + type or − type rotary operation groove is appropriately formed on the outer side portion of the head.

[0010]

[Action]

 When fixing a hollow structure or the like using the bolt of the present invention, the rod shaft end surface supports the surface member made of the material from the inside, so that it functions as a spacer and the inner surface of the head is The continuous scale-like uneven surface provides a slip prevention effect due to slippage during tightening.

[0011]

【Example】

 The present invention will be further described below with reference to the drawings illustrating one embodiment.

Reference numeral 1 denotes a male screw shaft portion, and a rod shaft portion 2 is connected to the base portion thereof. The rod shaft portion 2 is a rod-shaped shaft itself having no screw thread formed therein and has a diameter larger than that of the male screw shaft portion 1. The end surface 21 on the male screw shaft portion 1 side is a flat surface. There is. The length of the rod shaft portion 2 corresponds to the thickness of the fixed material 5.

Reference numeral 3 denotes a head, which is connected to the base of the rod shaft 2. The head portion 3 is formed to have a larger diameter than the rod shaft portion 2, and a continuous scale-like uneven surface 31 for preventing idling is radially formed on the inner surface for tightening the head portion 3. Reference numeral 32 is a rotary operation groove formed on the outer side of the head.

Reference numeral 4 denotes a nut, which is screwed into the male screw shaft portion 1, and a conventional nut such as a cap nut or a penetration nut is used.

[0015]

[Effect of device]

 By using the bolt of the present invention, even if the material 5 to be fixed is hollow or the like, which is susceptible to compression and dents, the surface member 51 will not be damaged or dented, and will not idle and will be strong and secure. Can be tightened and fixed.

[Brief description of drawings]

FIG. 1 is a front view of a bolt of the present invention.

FIG. 2 is a right side view of the bolt of the present invention.

FIG. 3 is an explanatory sectional view showing a usage state of the bolt of the present invention. <Explanation of reference numerals> 1: Male screw shaft portion 2: Rod shaft portion 3: Head portion 4: Continuous scale-like uneven surface

Claims (1)

[Scope of utility model registration request] 1. A rod shaft portion having a diameter larger than that of the male screw shaft portion and having no threads is connected to the base portion of the male screw shaft portion, and the rod shaft portion has a larger diameter than the rod shaft portion. A bolt characterized in that a head having a continuous scale-like concavo-convex surface is coupled to the inner diameter and tightening inner surface.