JP4434774B2 - Hook bolt - Google Patents

Description

  The present invention relates to a hook bolt used for fixing a sleeper to a steel material of a railway bridge, for example, and more particularly to a seismic and loosening-preventing hook bolt that is easy to fix and does not loosen due to train vibration or the like.

Conventionally, as a means for fixing a sleeper to an H-shaped steel material of a bridge, for example, techniques as shown in Patent Document 1 and Patent Document 2 are known. According to the means of Patent Document 1, a hook bolt having a hook portion whose tip is bent in an L shape is inserted into a through hole opened in a sleeper, and the hook portion at the tip is hooked on an H-shaped steel and is exposed above the sleeper. It has a structure in which a nut is screwed and fastened to the upper end of the part. In order to prevent the hook bolts from rotating together when tightening with a nut, complicated means such as welding a substantially flat rectangular getter washer to the hook portion and bringing both wing portions into contact with the steel end surface are taken. ing. Further, as a means for preventing the nut from loosening, a coil spring is mounted between the nut and the washer so that the vibration of the train is absorbed by the coil spring. Furthermore, according to the means of Patent Document 2, in order to prevent the above-mentioned co-rotation, a part of the shaft of the hook bolt and the through hole of the sleeper are made into non-round holes such as a square cross section to prevent the nut from loosening. Therefore, a horizontal hole is made in a hook bolt protruding above the nut, an R pin is inserted into this, and a spring washer is used in combination.
Japanese Patent Laid-Open No. 10-82407 Japanese Patent Laid-Open No. 2001-49620

  However, in the means of the above-mentioned Patent Document 1, the means for welding the getter washer to the bolt hook part is troublesome, and since the getter washer is thin, it cannot cope with strong tightening unless it is welded so carefully. There wasn't. In addition, the effect of preventing the loosening by the coil spring is hardly expected, and conversely, there is a concern that the loosening of the nut is promoted by vibration. Further, according to the means of Patent Document 2, the means for processing the hook bolt shaft portion and the many through holes of the sleeper into a non-round hole such as a square cross section is very troublesome, and in order to prevent the nut from loosening, The process of inserting the R pin into the side hole of the hook bolt that protrudes to the side is very complicated, and there is a drawback that the total cost is high.

  Therefore, the present invention prevents the bolt and the hook part from co-rotating when rotating and tightening the head of the bolt, while forming the lower hook part and the bolt separately. In addition, the main purpose is to provide a new hook bolt that reliably prevents the occurrence of loosening of the bolt without using any additional parts such as an R pin or a spring washer.

  In order to achieve the above object, the present invention takes the following technical means. That is, the hook bolt according to the present invention includes a bolt including a head portion including a rotation operation portion and a shaft portion, and a hook member including a screw hole into which the bolt is screwed. The The shaft portion of the bolt is composed of a barrel portion without a screw and a lower screw portion, and the diameter of the barrel portion is larger than the diameter of the lower screw portion. The upper part of the screw hole of the hook member is formed as a fitting hole into which the bolt body part is closely fitted, and either the fitting hole or the bolt body part is eccentric with respect to the screw hole shaft core. Is formed. As a result, when the bolt is screwed into the screw hole, the hook member is pressed in a direction orthogonal to the bolt axis by the sliding contact between the bolt body and the fitting hole, so that the natural relationship between the bolt and the hook member is relatively small. It is comprised so that rotation may be prevented. Further, the hook member is provided with a hook portion that comes into contact with the lower surface of the member to be fastened, such as a steel material, and a rotation prevention piece that engages with a part of the member to be fastened. The structure prevents co-rotation.

  It is preferable for the above-mentioned eccentric part to form the fitting hole of the hook member eccentrically with respect to the screw hole shaft core because it is easy to process, but the bolt body portion is eccentric with respect to the screw hole shaft core. You may make it form.

  The hook bolt of the present invention is a member to be fastened, such as a steel plate, by simply screwing the screw part of the bolt into the screw hole of the hook member and tightening the bolt and the hook member without rotating together. In the tightening process, the bolt and the hook member are relatively positioned relative to each other by the eccentric structure of either the fitting hole of the hook member or the bolt body portion inserted into the hook member. The screw threads are tightly engaged with each other by being pressed in a direction perpendicular to the direction, thereby reliably preventing natural rotation between the two due to vibration and the like without using any additional member such as a conventional R pin. Can do. In addition, even if the object to be fixed such as sleepers dies over time, it can be easily retightened by simply tightening the bolt head with a rotating tool, and the upper surface of the object to be fixed is easy to repair. Since the bolt shaft part does not protrude long as the bolt head is slightly protruded, there are various excellent effects such as ensuring safety during walking.

  The specific contents of the present invention will be described below based on the embodiments shown in the drawings. The hook bolt according to the present invention includes a bolt 1 having a hexagonal head 2 that is a substantial rotation operation portion 2a and a vertical shaft portion 3, and a screw hole 5 into which the bolt 1 is screwed. It is comprised from the hook member 4 provided with.

  The shaft portion 3 of the bolt 1 includes a barrel portion 3a having no screw and a lower screw portion 3b. The diameter D of the barrel portion 3a is formed larger than the diameter d of the lower screw portion 3b. The upper portion of the screw hole 5 of the hook member 4 is formed as a fitting hole 6 into which the body portion 3a of the bolt 1 is fitted, and the body portion 3a of the bolt 1 can be closely inserted into the fitting hole 6. Thus, both diameters are formed to be substantially equal. Further, the fitting hole 6 is formed slightly eccentric with respect to the axis of the screw hole 5. Thus, when the screw portion 3b of the bolt 1 is screwed into the screw hole 5, the bolt 1 and the hook member 4 are relatively orthogonal to the bolt axis due to the sliding contact between the bolt body portion 3a and the fitting hole 6. It is configured to prevent natural rotation between the bolt 1 and the hook member 4 by being pressed in the direction in which the bolt 1 is pressed. Further, the hook member 4 is provided with a member to be fastened, that is, a hook portion 7 that comes into contact with the lower surface 9a of the H-shaped steel 9 and a rotation blocking piece 8 that comes into contact with the end surface 9b of the H-shaped steel 9, so 1 and the hook member 4 are configured to prevent co-rotation.

  In use, the shaft portion 3 of the bolt 1 is inserted into the through-hole 11 provided in the sleeper 10 placed on the top of the H-shaped steel 9 serving as a bridge or the like, and the screw portion 3b exposed below is hooked. The sleepers 10 can be easily fixed simply by being screwed into the four screw holes 5. At this time, the hook portion 7 of the hook member 4 is positioned on the lower surface 9a of the H-shaped steel 9 and the rotation blocking piece 8 is brought into contact with the end surface 9b of the H-shaped steel 9 so The rotation can be reliably prevented and the tightening operation can be easily performed. In the tightening process, when the bolt body 3 a is inserted into the eccentric fitting hole 6 of the hook member 4, the bolt 1 and the hook member 4 are relatively compressed in a direction perpendicular to the bolt axis and screwed. Mountains are closely meshed with each other, and natural rotation between the two due to vibration or the like can be reliably prevented. In addition, when the sleeper 10 has been damaged over time, it can be easily tightened by simply tightening the head 2 appearing on the upper surface of the sleeper with a rotating tool, and repair is easy. Furthermore, since the shaft part like the conventional one does not protrude long on the sleeper upper surface, only a little head of the bolt comes out, so that safety during walking is ensured.

  In the above embodiment, the fitting hole 6 of the hook member 4 is formed eccentrically with respect to the screw hole axis, but conversely, the body portion 3a of the bolt 1 is eccentrically formed with respect to the screw hole axis. May be. Even in this case, the same effect as the previous embodiment can be expected. Moreover, the rotation operation part 2a of the bolt head 2 is not limited to the hexagonal shape as shown in the embodiment, and may take any form as long as an arbitrary rotation tool is engaged.

  The hook bolt of the present invention can be used for, for example, fixing a building beam material to a steel material or other various applications in addition to the above-described use for fixing a bridge sleeper.

The perspective view which shows one Example of the hook bolt which concerns on this invention The perspective view which shows the usage example of the hook bolt which concerns on this invention Sectional drawing which shows the use condition of the hook bolt which concerns on this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bolt 2 Bolt head 2a Rotation operation part 3 Bolt shaft part 3a Body part 3b Screw part 4 Hook member 5 Screw hole 6 Fitting hole 7 Hook part 8 Rotation prevention piece

Claims (1)

It comprises a bolt having a head portion and a shaft portion provided with a rotating operation portion, and a hook member having a screw hole into which the bolt is screwed. The upper portion of the screw hole of the hook member is formed as a fitting hole into which the bolt barrel portion is fitted , and the fitting portion is formed with the fitting portion. Both diameters are formed to be substantially equal so that the bolt body can be closely inserted into the fitting hole, and either the fitting hole or the bolt body is eccentric with respect to the screw hole axis. Formed so that when the bolt is screwed into the screw hole, the hook member is pressed in the direction perpendicular to the bolt axis by sliding contact between the bolt body and the fitting hole. And a hook part that comes into contact with the lower surface of the fastened member and a fastened part to the hook member Hook bolt and rotation preventing pieces engage a portion of is provided.

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