JPH0679802U - Embedded plug for rail fastening - Google Patents

Abstract

(57) [Summary] [Purpose] When molding an embedding plug, the internal thread molding bolt of the embedding plug should be easily demolded when demolding. [Structure] On a top end portion of a cylindrical main body 1 having a female thread 2 for threading a rail fastening bolt, a head polygonal piece 4 having a planar polygonal shape is provided integrally with the main body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an embedded plug for fastening a rail.

[0002]

[Prior art]

 As shown in FIGS. 5 to 10, a conventional plug of this type has a cylindrical main cylinder a made of synthetic resin, on which an internal thread b of a rail fastening bolt is provided on an inner peripheral surface thereof, and a spiral projection is formed on an outer peripheral surface thereof. c is projected and embedded in a concrete sleeper, and a rail fastening bolt is screwed and tightened to the female portion.

[0003]

[Problems to be solved by the device]

 When molding the embedding plug, as shown in FIG. 11, an embedding plug f is formed between the upper and lower outer molds d and e, and the female thread forming bolt g inserted in the embedding plug is rotated. Since the product is held by the upper and lower outer molds at the time of releasing from the mold, only the female thread forming bolt g can be released from the product without rotating.

Recently, the above-mentioned automatic molding apparatus for embedded plugs has been used, and the following problems have occurred during the removal of the embedded plug from the mold. FIG. 12 shows an automatic molding apparatus for the same plug, in which a pair of outer molds h 1, h 2 for molding the plug on the upper mold A are slidable on a tapered guide pin i arranged on the upper mold A. Of the mold h, the lower ends of the molds h are guided along the guide rails 1 provided in the longitudinal direction on the upper surface of the plate k supported by the lower mold B via the spring j. It is movably mounted.

Further, the lower mold B is mounted with a bolt m for forming an internal thread portion of an embedding plug so that it can be automatically driven and rotated by a motor. Then, when the mold opening is started by the upper mold A and the lower mold B, the outer mold frames h, h slide along the guide pins i, i, and the guide rail 1 of the plate k is indicated by an arrow. Begin spreading outward as shown.

At the same time, the bolt m rotates in the direction of the arrow, the product moves upward, and the plate k is also pushed up by the biasing force of the spring j. In this way, the female thread forming bolt m of the embedding plug is driven and rotated by the automatic motor drive system, so that the position of the bolt m is fixed, and if the bolt rotates, the position of the product may change. Since it is not possible to press the outside of the product and the outer frames h and h are expanded early, when the female thread forming bolt m rotates, the product also rotates together with the same. , Can not be demolded.

The present invention has been proposed in view of the above problems of the prior art, and an object of the present invention is to form an internal thread portion of an embedding plug at the time of demolding the embedding plug. The purpose of the present invention is to provide a rail fastening bolt that can be easily removed from the bolt.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the rail fastening embedding plug according to the present invention comprises a cylindrical main body provided with a planar polygonal head collar piece integrally with the upper end of the cylindrical main body.

[0009]

[Action]

 As described above, the rail fastening embedment according to the present invention is provided with the planar polygonal head flange piece integrally with the cylindrical main body at the upper end portion thereof. The horizontal side forming one side of the polygon in the head collar piece is locked in the locking recess provided in the plate that slidably supports the external mold for embedding plug molding. The embedding plug is prevented from co-rotating with the rotation of the female screw forming bolt of the inserting plug, and the molding bolt is easily released from the mold.

[0010]

【Example】

 The present invention will be described below with reference to the illustrated embodiments. Reference numeral A denotes a rail fastening plug, which is provided with a female thread 2 for threading a rail fastening bolt on the inner peripheral surface of the cylindrical main body 1 and with a spiral projection 3 protruding on the outer peripheral surface. On the upper end of the cylindrical main body 1, a head polygonal piece 4 having a planar polygonal shape is provided integrally with the main body 1. (Refer to FIGS. 1 to 3) Since the illustrated embodiment is configured as described above, the plate k shown in FIG. 12 and the head flange 4 of the polygonal plane are formed at the time of molding the embedding plug. By forming a molding concave portion k'of the above and by filling the molding material of the collar piece 4 into the concave portion k ', a pair of outer mold h is opened at the time of demolding, as in the case of FIG. At the same time, even when the female thread forming bolt m of the embedding plug is rotated, the horizontal side portion of the head collar piece 4 is engaged with the engaging recess k ′ provided in the plate k. The embedded plug formed between the outer mold h does not rotate together with the bolt m, so that the bolt m can be easily removed from the mold. (See FIG. 3) In FIG. 3, the same parts as those in FIG. 11 are designated by the same reference numerals.

[0011]

[Effect of device]

 As described above, the rail fastening fastening plug according to the present invention is provided with a planar polygonal head collar piece integrally with the upper end of the cylindrical main body of the fastening plug. At this time, when the bolt for forming the female thread on the inner circumference of the embedding plug is rotated at the time of removing the mold, co-rotation of the bolt of the embedding plug molded body is prevented through the horizontal side portion of the collar piece. Is done easily.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of an embedded stopper for rail fastening according to the present invention.

FIG. 2 is a front view of the embedding plug.

FIG. 3 is a plan view of the embedding plug.

FIG. 4 is a vertical cross-sectional view showing a molding device for the embedding plug.

FIG. 5 is a plan view of a conventional embedding plug.

FIG. 6 is a front view of a conventional embedding plug.

FIG. 7 is a right side view of a conventional embedding plug.

FIG. 8 is a rear view of a conventional embedding plug.

FIG. 9 is a left side view of a conventional embedding plug.

FIG. 10 is a bottom view of a conventional embedding plug.

FIG. 11 is a plan view showing a conventional apparatus for molding an embedded plug.

FIG. 12 is a vertical cross-sectional view showing a conventional automatic molding apparatus for an embedded plug.

[Explanation of symbols]

 1 Cylindrical main body 2 Internal thread of rail fastening bolt 3 Protrusion 4 Head collar piece

Claims (1)

[Scope of utility model registration request] 1. A rail fastening embedding plug having a spiral protrusion protruding from an outer peripheral surface of a cylindrical main body having a female threaded hole for screwing a rail fastening bolt, wherein the main body is integrally formed with an upper end portion of the cylindrical main body. An embedding plug for rail fastening, characterized in that a head polygonal piece having a polygonal shape in a plane is provided on the.