JP2000074025A - Flat head pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform periodic safety inspection of a railway rolling stock safety and in a short time. SOLUTION: A lock pin 2 is provided capable of sliding in a cylinder part 1 formed in an insertion side end part of a flat head pin P. A rotary cam 3A for moving the lock pin 2 is provided in an operating lever body inserted rotatably in the cylinder part 1. A rotation preventing device is provided in an operating part 3B of the operating lever body protruded from the cylinder part 1. The rotation preventing device is constituted by an operating ring 4A, spring 4B, and a stopper 4C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat head pin used mainly for connecting various parts related to running of a railway vehicle.

[0002]

2. Description of the Related Art Conventionally, parts used in railway vehicles have been regularly inspected. In this inspection, the safety state of each component is confirmed, and the defective component is replaced. In particular, flat head pins that connect parts related to travel are subjected to strict inspections to ensure safety, and are frequently attached and detached during inspection and replacement of parts. Uses split cotters and split pins that are easy to attach. Since the split cotter and the split pin can be easily connected only by expanding the tip at the time of mounting, the mounting operation of the flat head pin is facilitated.

As a special joining pin which does not use a split cotter or a split pin, a joining pin device described in Japanese Utility Model Publication No. 47-13787 has been proposed. This joining pin is provided with a coil spring at one end of the pin, and a hook of a locking piece is locked in a groove provided at the other end of the pin, so that the locking piece is not detached by the biasing force of the coil spring. It is a thing.

[0004]

The split cotter or split pin used for the conventional flat head pin is discarded after being removed for inspection, and a new one is used. However, since many parts are used in railway vehicles and periodic inspections are repeated, the annual amount of split cotters and split pins that are discarded for each inspection is extremely large.

[0005] Moreover, while the work of mounting the split cotter and the split pin is easy, when the flat head pin is removed, the spread tip of the split cotter or the split pin is narrowed using a hammer or a special tool while the flat cotter or the split pin is narrowed. This removal work requires a lot of time and effort.
In addition, since the operator replaces in a very narrow place, he must be in a cramped posture, and when the worker works upwards, when removing the flat head pin using a hammer or special equipment In addition, the work efficiency was extremely poor when dust and dirt fell on the worker's face, and the work was dangerous.

On the other hand, in a conventional special pin proposed as a joining pin device, a pin engaged with a locking piece is always urged by a winding spring. For this reason, when vibration or rotational force is applied to the pin, the vibration or rotational force is transmitted to the locking piece via the tension of the winding spring. The pieces may come off. In addition, since the locking piece and the winding spring are arranged at both ends of the pin, the locking spring is pushed in at the end of the pin when the pin is mounted, and the locking piece is installed with the opposite side, and the parts are passed through this locking piece. A troublesome operation such as locking the tip of the pin is required. Also, when removing the pin, it is necessary to open the pin tip from the locking piece on the opposite side of the winding spring,
This attaching and detaching operation requires much labor. Moreover, since the pin tip and the locking piece are locked inside the locking piece, it is extremely difficult to check whether the pin tip is in a normal locking state. It was also inconvenient for safety checks.

Therefore, the present invention has been made to solve the above-mentioned problems, and can be attached and detached by an extremely simple operation.
Moreover, it is an object of the present invention to provide a flat head pin that can easily determine whether or not the flat head pin is in a normal connection state.

[0008]

In order to achieve the above object, a first means of the present invention is to provide a flat head pin for connecting parts in a cylindrical portion 1 formed at an insertion side end of the flat head pin P. An operating rod 3 provided with a locking lock pin 2 so as to be able to protrude and retract and a rotating cam 3A for allowing the locking lock pin 2 to protrude and retract is rotatably inserted into the cylindrical portion 1, and an operating rod 3 protruding from the cylindrical portion 1. Is provided with the rotation preventing device 4 in the operation unit 3B.

The rotation preventing device 4 of the second means has an operation ring 4A slidably provided around the operation rod 3, and the operation ring 4A is disposed inside the operation ring 4A to lock the operation ring 4A. The lock 4 includes a spring 4B against which the lock pin 2 is pressed and urged, and a stopper 4C with which the operating ring 4A and the cylinder 1 are locked by the biasing force of the spring 4B when the locking lock pin 2 is in the locked state.

A third means is a means for solving the problem in that the rotation preventing device 4 is provided with an identification portion 4D for identifying a locked state or a released state of the locking lock pin 2.

According to the present invention, the locking lock pin 2 is protruded and retracted in the cylindrical portion 1 by rotating the operating rod 3, and the flat head pin P is attached and detached. At this time, the locking lock pin 2 is prevented from being released during use by the stopper 4C that locks when the locking lock pin 2 is in the locked state. In addition, the identification unit 4D provided in the rotation prevention device 4 includes:
It indicates whether the lock pin 2 is in the locked state or the released state.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. The symbol P shown in the figure is a flat head pin that connects parts of a railway vehicle (see FIG. 1). A tubular portion 1 is formed at the insertion end of the flat head pin P, and a locking lock pin 2 is provided in the tubular portion 1 so as to be able to protrude and retract.

The locking lock pin 2 is made to protrude and retract by operation of an operating rod 3 rotatably inserted into the cylindrical portion 1 (see FIGS. 4 and 5). The illustrated locking lock pins 2 are provided as a pair on the side surface of the tubular portion 1. Each locking lock pin 2 is provided with a spring 2A so as to be automatically immersed in the cylindrical portion 1 from a state where it protrudes from the side surface of the cylindrical portion 1 (see FIG. 1). The locking lock pin 2 and components described later are interchangeable. At this time, a female screw 2B is provided at the tip of the locking lock pin 2 and the female screw 2B is
By screwing bolts (not shown) to the components, the components of the present invention can be easily assembled and exchanged.

Incidentally, a flat-head pin P having a diameter of 30 mm and a total length of 200 mm is
Locking pin 2 with a diameter of 8mm and a total length of 11mm is the largest from the cylinder 1
When a tensile test was carried out in a state of protruding 5 mm, it was confirmed that the locking lock pin 2 of the present invention had a strength of 5368.8 kgf, while the commonly used split cotter was 4017.6 kgf. (Examination on July 16, 1998 at the Small and Medium Enterprise Promotion Center in the Joto area, Tokyo).

The operating rod 3 is rotatably inserted into the cylindrical portion 1. A rotating cam 3A is provided at one end of the operating rod 3, and the locking lock pin 2 is extended and retracted (see FIGS. 4 and 5). . The other end of the operating rod 3 is an operating portion 3B, and a rotation preventing device 4 is provided on the operating portion 3B protruding from the cylindrical portion 1. The illustrated operating rod 3 is provided with a locking groove 3C at a substantially central portion in the longitudinal direction of the operating rod 3 so as to be rotatably supported in the cylindrical portion 1, and a locking screw 3 </ b> D inserted into the cylindrical portion 1 from the outside. (See FIG. 1). Reference numeral 5 in the figure is an engagement ring that locks a rotation preventing device 4 described later on the operation unit 3B, and reference numeral 6 is a retaining ring.

The rotation preventing device 4 includes an operating portion 3 of the operating rod 3.
When the operation ring 4A fitted to B is provided and the operation ring 4A is rotated, the operation rod 3 rotates (see FIGS. 4 and 5). The operation ring 4A is slidably provided around the operation section 3B. On the other hand, a spring 4B is disposed inside the operation ring 4A, and the locking ring 2 presses the operation ring 4A. When the lock pin 2 is in the locked state, the stopper 4 locks the operation ring 4A and the cylinder 1 by the urging force of the spring 4B.
C is provided. The illustrated stopper 4C has a configuration in which a fitting concave portion 1A provided at the end of the cylindrical portion 1 and a fitting convex portion 4E provided at the end of the operation ring 4A are fitted (FIGS. 2, FIG. 3). According to this stopper 4C, when the locking lock pin 2 is in the locked state protruding from the cylindrical portion 1,
The operating ring 4A and the tubular portion 1 are engaged by the urging force of the spring 4B. To release the lock pin 2, the rotation preventing device 4 is first released by pulling the operation ring 4A in the direction of the operation portion 3B, and then the lock ring 2 is turned by turning the operation ring 4A. 1, the locking lock pin 2 is released. At this time, the state of the locking lock pin 2 can be confirmed at the position of the fitting concave portion 1A and the fitting convex portion 4E of the stopper 4C.
Only by checking the state of C, the locked state or the released state of the locking lock pin 2 can be identified.

Reference numeral 4D in the figure denotes an identification unit for more clearly identifying the locked state or the released state of the locking lock pin 2 (see FIGS. 2 and 3). The illustrated identification portion 4D is colored in a line on the cylinder portion 1 and the operation ring 4A, and by confirming the position of the identification portion 4D, the locking lock pin 2 is formed.
Can be identified as a locked state or a released state.

[0018]

According to the present invention, the above-mentioned configuration achieves the original object.

That is, with the locking lock pin 2 of the first aspect, the flat-head pin P
Can be easily attached and detached, and can be used repeatedly. As a result, there is no need to discard each inspection as with conventional split cotters and split pins.
Inspection costs can be reduced. Moreover, the rotation preventing device 4 can reliably prevent the locking lock pin 2 from being released during locking. Further, since the locking lock pin 2 can be protruded and retracted by rotating the operation rod 3, the attachment / detachment work is extremely easy, and replacement in a narrow place can be performed smoothly. As a result, the work of removing the flat-head pin P can be made safe, and it is no longer necessary to perform the work of attaching and detaching unlike the special pins conventionally proposed. In addition, when removing the split cotter or the split pin, the danger that dust and dirt may fall on the worker's face has been eliminated, so that the periodic safety inspection of the vehicle can be performed safely and in a short time. .

The rotation preventing device 4 according to the second and third aspects makes it possible to easily determine whether or not the flat head pin P is in a normal connection state. Therefore, the inconvenience that it is difficult to confirm whether or not the tip of the pin is in a normal locking state as in the case of the special pin proposed in the related art is solved, and it is suitable for periodic inspection work.

As described above, according to the present invention, the railcar can be attached and detached by a very simple operation, and it can be easily determined whether or not the flat head pin is in a normal connection state. It can be performed safely and in a short time, and has various beneficial effects such as a reduction in inspection costs.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a main part perspective view showing a state in which a stopper of the rotation preventing device of the present invention is engaged.

FIG. 3 is a perspective view of an essential part showing a state in which a stopper of the rotation prevention device of the present invention is released.

FIG. 4 is a cross-sectional view of a main part when the locking lock pin of the present invention is in a locked state.

FIG. 5 is a sectional view of a main part in a state where the locking lock pin of the present invention is released.

[Explanation of symbols]

 P Flat head pin 1 Cylindrical part 1A Fitting recess 2 Locking pin 2A Spring 2B Female screw 3 Operating rod 3A Rotating cam 3B Operating part 3C Locking groove 3D Locking screw 4 Rotation preventing device 4A Operating ring 4B Spring 4C Stopper 4D Identification Part 4E fitting convex part 5 engaging ring 6 retaining ring

Claims (3)

[Claims] 1. A flat head pin for interconnecting parts,
A locking lock pin is provided in a cylindrical portion formed at the insertion side end of the flat head pin so as to be able to protrude and retract, and an operating rod provided with a rotating cam for making the locking lock pin protrude and retract is rotatably inserted into the cylindrical portion. A flat head pin, wherein a rotation preventing device is provided on an operation portion of an operation rod protruding from the portion. 2. The rotation preventing device according to claim 1, wherein the operation ring is slidably provided around an operation rod, and a locking lock pin is disposed inside the operation ring so that a locking lock pin presses and biases the operation ring. 2. The flat head pin according to claim 1, comprising a spring, and a stopper for locking the operation ring and the cylindrical portion by a biasing force of the spring when the locking lock pin is in a locked state. 3. The flat head pin according to claim 1, wherein the rotation preventing device is provided with an identification portion for identifying a locked state or a released state of the locking lock pin.