JP2011021751A - Bolt fastening structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt fastening structure that can surely attain a rotation stop function by simple structure. <P>SOLUTION: A floor plate 2 fixing a rail base of a railroad rail 1 includes a through-hole 15 allowing the insertion of a bolt head from above, and a recess 16 allowing the rotation of the head around an axis of a bolt shank at the rear face side of the through hole 15. The recess 16 has a depth for settling the bolt head within the thickness of the floor plate 2, and a notch allowing the rotation of the bolt head at an angle smaller than 90° in a nut fastening direction around the axis of the bolt shank. The bolt head inserted in the through-hole 15 is rotated in the nut fastening direction along the inner wall surface of the recess 16 around the bolt axis. The bolt head is thereby engaged with the notch part of the recess 16 and inhibited from being pulled out in the axis direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bolt fastening structure, and more particularly to a bolt fastening structure suitable for fastening a railroad rail installed on a floorboard supporting the railroad rail to the floorboard.

  For example, in general, a branching unit fixes a steel floor board on a sleeper and fixes a basic rail on the floor board, while a Tongleil provided adjacent thereto is slid on the floor board to slide left and right by a machine. The structure is adopted. As a rail fastening device for a railroad track branching device, as shown in FIG. 4, a washer 7 is fixed to a floor plate 2 with a bolt 3 (along a groove 10) so that the left and right positions can be adjusted. A washer-type fastening structure in which the base 8 is pressed to fasten the rail 1 to the floor plate 2 is employed. In this case, when tightening the nut, it is preferable to have a structure in which a bolt is prevented from rotating together and firmly tightened.

  For example, the bolt fastening structure shown in FIG. 4 is used.

  4A to 4C, 1 is a rail, 2 is a floor plate, 3 is a fastening bolt, 4 is a nut, 5 is a spring washer, and 6 is a flat washer. Reference numeral 7 denotes a washer whose concave portion 7 a abuts against the rail base 8 and presses the rail base 8 toward the floor plate 2. 9 is an insertion hole provided in the floor plate 2 through which the shaft and head of the fastening bolt can be inserted, 10 is a groove provided in the floor plate 2, and is fitted into the leg 7b of the washer 7, and 11 is provided in the floor plate 2. In addition, a recess that can move the bolt head and accommodate the bolt head, and 12 is an opening provided in the floor plate 2 that can move only the bolt shaft portion. At this time, as shown in FIG. 5 (a), when the head 3a of the fastening bolt 3 has a rectangular cross section, the floor plate passes through an opening formed in the washer 7 shown in FIG. 4 (a). 4, and further, as shown in FIG. 4 (c), the bolt shaft portion is moved in the direction of arrow 13 a or 13 b along the opening 12, and next, FIG. ), The rail 1 can be fastened to the floor plate 2 by fitting the washers 5 and 6 to the shaft portion of the fastening bolt 3 and fastening the nut 4. However, since the recess 11 is sized to allow the bolt head to move freely in the horizontal direction, the bolt head together with the nut 4 can be tightened even if the nut 4 is tightened to the bolt that has advanced in the direction of the arrow 13a or 13b. Since the portion 3a may rotate together, it cannot be fastened well, and the side surface 3b (see FIG. 5B) of the bolt head 3a is on the end surface 11a of the recess 11 (see FIG. 6A). It may be fastened in a state of being biased without being in close contact (with only a part of the side surface 3b being in contact with the recess end surface 11a).

  The present invention is based on the original idea of the inventor, and there is nothing to be described as prior art document information.

  The present invention has been made in view of such problems of the prior art, and its purpose is to simplify the fastening structure for fixing the rail base of a railroad rail to a floor plate with bolts and nuts. And it is providing the fastening structure of the volt | bolt which can fulfill | perform an anti-rotation function reliably.

  In order to achieve the above object, the bolt fastening structure of the present invention is a bolt fastening structure in which a rail base of a railroad rail arranged on a floor board is fixed to the floor board with a washer fixed with a bolt and a nut, The bolt has a bolt shaft portion and a head portion protruding in a symmetric direction orthogonal to the bolt shaft portion axis at the end of the bolt shaft portion, and the washer has an opening through which the bolt is inserted. The floor plate includes a through hole into which the head of the bolt can be inserted from above at a position where the washer is fixed, and the head centered on the axis of the shaft portion of the bolt on the back side of the through hole. A recess capable of rotating the portion, and the recess has a depth at which the bolt head fits within the thickness of the floor plate, and the bolt head in the nut tightening direction about the axis of the bolt shaft portion. Can be rotated at an angle of less than 90 ° The bolt head inserted into the through-hole is rotated in the nut tightening direction along the inner wall surface of the recess with the bolt axis as a center. It is characterized in that it is configured so that it cannot be pulled out in the axial direction by engaging with the notch.

  According to the present invention, the bolt head is inserted into the through hole, the nut is screwed into the bolt screw portion, and the bolt head is formed in the recess corresponding to the bolt head shape with the axis of the bolt shaft as the center. When the bolt head is rotated in the tightening direction along the inner wall surface, the bolt head is tightly captured by the inner wall surface of the recess formed so as to have a symmetrical shape with the through hole interposed around the shaft center, and rotates together with the nut. It is possible to conclude without. To release the fastening, turn the nut in the loosening direction and rotate the bolt head around the axis of the bolt shaft along the inner wall surface of the recess in the opposite direction to the fastening position to match the through hole. The bolt head that has returned to the end can be pulled out of the through hole.

  In the present invention, the concave portion corresponding to the bolt head shape is cut out so as to leave a part around the through hole, and the concave portion is centered on the axis of the bolt shaft portion. Can be rotated at an angle of less than 90 ° in the nut tightening direction, so that it is possible to reliably prevent the bolts from rotating together.

  In addition, the bolt head is pulled out by rotating the bolt head inserted into the through hole in the nut tightening direction along the inner wall surface of the recess about the axis of the bolt shaft so as to prevent the bolt from coming off. A through hole and a recess are formed so that this is impossible.

  ADVANTAGE OF THE INVENTION According to this invention, the fastening structure of the volt | bolt which can be made into a simple structure and can fulfill | perform an anti-rotation function reliably can be provided.

Fig.1 (a) is a side view which shows an example of the fastening structure of the volt | bolt of this invention, FIG.1 (b) is a side view of a floor board, FIG.1 (c) is a top view of a floorboard. FIG. 2A is a plan view showing an example of the arrangement of the concave portions corresponding to the through holes and bolt shapes in the present invention, and FIG. 2B is a cross-sectional view taken along the line II-II in FIG. 3A to 3D are views for explaining the movement of the fastening bolt head in the recess in the present invention. 4 (a) is a side view showing a conventional bolt fastening structure, FIG. 4 (b) is a side view of the floor board, and FIG. 4 (c) is a plan view of the floor board. Fig.5 (a) is a side view of an example of the combination of a fastening bolt-nut, FIG.5 (b) is a left end view of Fig.5 (a). 6A is a view for explaining the movement of the fastening bolt head in FIG. 5 in the recess, and FIG. 6B is a cross-sectional view taken along the line VI-VI in FIG. 6A.

  EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the following examples, and can be appropriately changed and modified without departing from the technical scope of the present invention.

  1A is a side view showing an example of the bolt fastening structure of the present invention, FIG. 1B is a side view of the floor board, FIG. 1C is a plan view of the floor board, and the same configuration as FIG. Parts are denoted by the same reference numerals and description thereof is omitted.

  The present Example 1 is an example corresponding to the bolt shown in FIG. 5A whose head has a rectangular cross section. 1 (a) to 1 (c), 15 is a through-hole through which a shaft and a head of a fastening bolt can be inserted provided in the floor plate 2, and 16 is a bolt head shape provided in the floor plate 2. Correspondingly, the bolt head can be moved and is a recess that accommodates the bolt head. As shown in FIG. 2A, the concave portion 16 corresponding to the bolt head shape is cut out so as to leave a part around the through hole 15, and the concave portion 16 is centered on the axis 17 of the bolt shaft portion. Are formed symmetrically with the through-hole 15 in between. The bolt head can be rotated about 90 ° in the nut tightening direction or the nut loosening direction around the shaft center 17 along the inner wall surface of the recess 16, and the bolt head does not rotate more than 90 °. Is prevented. The bolt head inserted into the through-hole 15 is rotated in the nut tightening direction along the inner wall surface of the recess 16 around the shaft center 17 of the bolt shaft so that the bolt head cannot be pulled out. The hole 15 and the recess 16 are formed.

  The fastening operation by the fastening bolt in the first embodiment will be described.

  As shown in FIG. 3 (a), a through hole 15 provided in the floor plate 2 through an opening in which a head 3a (see FIGS. 5 (a) and (b)) of the fastening bolt 3 is formed in a washer 7 (see FIG. 1). As shown in FIG. 1 (a), the bolt heads as shown in FIG. 3 (b) are inserted by fitting the washers 5 and 6 into the shaft portion of the fastening bolt 3 and tightening the nut 4. When the portion 3a is rotated about 90 ° in the nut tightening direction (in the direction of the arrow) along the inner wall surface of the recess 16 about the axis of the bolt shaft portion 3c, the bolt head 3a is blocked by the end surface 16a of the recess 16 Then, since the bolt does not rotate any more, the rotation of the bolt is prevented and the state shown in FIG. 3C is obtained, and the rail 1 can be fastened to the floor plate 2 as shown in FIG. As shown in FIG. 3 (c), the head 3a of the fastening bolt is firmly captured by the inner wall surface of the recess 16 having a shape corresponding to the shape of the bolt head, and the through hole 15 and the bolt head 3a are orthogonal to each other. Therefore, the bolt cannot be removed in this state.

  In order to prevent co-rotation of the bolts, the recess 16 may be cut out so as to leave a part around the through hole 15, and the recess 16 has the bolt head 3a centered on the axis 17. It is sufficient if the nut can be rotated at an angle of less than 90 ° (for example, 10 °, 20 °, 30 °, 60 °) in the nut tightening direction.

  Next, in order to release the fastening, as shown in FIG. 3 (d), the bolt head 3a is loosened in the nut loosening direction (in the direction of the arrow) along the inner wall surface of the recess 16 with the axis of the bolt shaft 3c as the center. 3), the head 3a of the fastening bolt 3 is pulled out from the through hole 15 of the floor plate 2.

  INDUSTRIAL APPLICABILITY The bolt fastening structure according to the present invention can be used for a bolt fastening structure suitable for use for fastening a railroad rail installed on a floorboard supporting the railroad rail to the floorboard.

DESCRIPTION OF SYMBOLS 1 Rail 2 Floor plate 3 Fastening bolt 3a Bolt head 3c Bolt shaft part 4 Nut 5 Spring washer 6 Flat washer 7 Washer 8 Rail base 9 Insertion hole 10 Slide groove of washer leg part 11 Recess 12 Opening 15 Through hole 16 Recess 17 Axis heart

Claims (1)

A bolt fastening structure for fixing a rail base of a rail to be arranged on a floor board to the floor board with a washer that is fixed by a bolt and a nut,
The bolt has a bolt shaft portion and a head portion protruding in a symmetric direction perpendicular to the bolt shaft portion axis at the end of the bolt shaft portion,
The washer has an opening through which the bolt is inserted;
The floor plate includes a through hole into which the head of the bolt can be inserted from above at a position where the washer is fixed, and the head around the axis of the shaft portion of the bolt on the back side of the through hole. A recess capable of rotating,
The recess has a depth at which the bolt head can be accommodated within the thickness of the floor plate, and a notch that can rotate the bolt head at an angle of less than 90 ° in the nut tightening direction about the axis of the bolt shaft. And the bolt head inserted into the through hole is rotated in the nut tightening direction along the inner wall surface of the recess about the bolt axis, so that the bolt head becomes a notch portion of the recess. A bolt fastening structure, wherein the bolt fastening structure is configured such that the bolt cannot be pulled out in the axial direction by engaging with the bolt.

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