JPH0540950Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] Eliminates short circuits in signal circuits and accidents involving workers, which are the biggest drawbacks that could not be prevented with conventional crowbars when repairing railway tracks. This is a crowbar that you can use with confidence.

[Conventional technology]

A conventional crowbar used for railway track repair work consists of a forged claw part at the front end 6, a round bar part of the body 1, and a pointed end part at the rear end 7, as shown in the overall sketch of Fig. 3. It is a single iron rod.

[The problem that the idea aims to solve]

In the cross-sectional view of the railway track in Figure 4, 8 is the track bed ballast, 9 is the sleeper, 10 and 12 are the rails,
11 indicates a dog nail.

There are various uses for crowbars, but the main one is to place the crowbar in position 13 shown in Figure 4 with the claw part against the dog nail, hold the crowbar near the rear end with your hand, and forcefully move it to position 14. Push down and pull out the dog nail.

This involves sticking the rear end of a crowbar vertically into the trackbed ballast, grasping the body with your hand, and using the principle of leverage to move the track from side to side while applying the crowbar to the rail.

Work involves prying up free rails (not secured with dog nails) placed on the ground and moving them laterally.

Examples include.

Two types of accidents occur frequently. One is 11 with a crowbar nailed to the rail of 10.
When pulling out the dog nail, the part of the body that is gripped unconsciously comes close to the opposite rail 12, and in an attempt to forcefully push down the crowbar from position 13 to position 14, the hand is placed between crowbar 14 and rail 12. It often gets caught and crushes fingers.

The other thing is that during the same work, even if you were careful to remove the grip on the body, the crowbar at 14 would come into contact with the rail at 12 in order to forcefully push it down from 13 to 14. .

Railway tracks now have signal circuits (equipment circuits that turn on the signals so that trains can run safely) all along the line, and these all use rails 10 and 12 on both sides to flow a weak current. can be,
When the crowbar comes to position 14 as above, 10
The rails 12 and 12 are short-circuited through the dog nail 11 and the crowbar. This has the same meaning as if a train were present at this location, and the signal circuit would be shorted and the signal would turn red.

If it is a normal signal section, the signal will flash red every time there is a contact, and the train will stop. In addition, the same applies to the single-track automatic signal section, but if there is a double contact near the turnout, the signal will permanently turn red, resulting in a long recovery time. In order to solve these problems, conventionally, as shown in Fig. 5, yellow paint or the like was painted on the part 16 of the crowbar barrel 1 that contacts the rail 12 to call attention to it. Not only does the painstaking paint that has been applied peel off and become useless when repairing work, but even immediately after painting, when working at night in the dark, or even during the day, people unconsciously touch the area. I often get caught. Another drawback was that paint alone was not effective in preventing short circuits.

Therefore, as shown in Fig. 6, an insulating material such as rubber was wrapped around a portion 17 of the barrel 1 of the crowbar. The result is that the electrical insulation material in the area is rolled up by the ballast and is quickly damaged.

Therefore, in order to further prevent this curling up, a part of the body 1 is hollowed out around the entire circumference of the crowbar as shown in Fig. 7, and both ends of the hollowed out area are
9, and then inserting and gluing an electrically insulating material such as rubber into this part, but this method had major problems and was no longer possible.

That is, as shown in Fig. 8, the cross section of the crowbar is 21 or 22 compared to the regular circular 20.
As shown in the figure, the radius is also different, and it does not form a circle. This is because the crowbar is forged as described above, and in this state it is impossible to form it as shown in FIG. 7.

Therefore, we attempted to process and form a part of the crowbar that would have sufficient durability for the main work and other tasks, but would also alert workers during the work and prevent the two types of accidents. It is something to do.

[Means to solve the problem]

As a method to prevent accidents during work while maintaining sufficient durability for work such as
As shown in FIG. 1, a required number of perforation groups 2 are made at the portion of the barrel 1 of the crowbar that contacts the opposing rail 12 in FIG.

To explain this in detail, Figure 2 is A-A in Figure 1.
This figure shows a cross section, in which a hole like 3 is made on the surface of the body 1, and a material 4 having electrical insulation, shock resistance, abrasion resistance, and abrasion resistance (for example, polycarbonate) is inserted into the hole. ) is made to protrude slightly from the surface of the burl, is press-fitted into the hole 3, and is bonded with an adhesive 5.

[Effect]

By processing and forming the crowbar in this way, the moment the worker grasps the part protruding from the surface of the crowbar, he or she will feel the wart and feel danger, and in order to remove his/her hand from that part, the worker will move his/her finger between the rail and the crowbar. This eliminates the possibility of clogging, and even if the crowbar comes into contact with the external rail, the signal circuit will not be short-circuited.

These press-fitted and glued warts can maintain their durability even after further processing.

〔Example〕

A group of holes like 2 on the back of the body 1 of the crowbar shown in Figure 1 was drilled to match the actual railway tracks, with the spacing and number of rows determined, as shown in Figure 2, and a material 4 made of various materials was pressed into and adhered to the holes to create a prototype.

[Effect of idea]

When you grasp the wart part in Figure 2, you can feel it in your palm, and the signal circuit will not short-circuit even if you touch the crowbar to the opposite rail.

Also, to test whether it would withstand the above work, I poked the crowbar into the trackbed ballast many times and pulled it out, but there was no damage at all. Further work will have little effect, but just to be safe, I tried prying the part shown in Figure 2 against the rail, but there was no damage.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a group of perforations made on a part of the back surface of the crowbar, Figure 2 is a cross section taken along line A-A in Figure 1, and a diagram in which a special material is press-fitted into the drilled holes. Figure 4 shows the overall outline of the crowbar, Figure 4 is a cross-sectional view of the railway track, and a diagram showing the path of the crowbar when pulling out dog nails using the crowbar. Figure 5 shows a part of the crowbar painted with paint. Fig. 6 shows a part of the crowbar wrapped with electrical insulating material, Fig. 7 shows a part of the crowbar cut along the circumference of the crowbar, and Fig. 8 shows the body of the crowbar. FIG. 3 is a diagram showing a cross section. 1...Body of the crowbar, 2...Group of perforations made in a part of the crowbar, 3...Cross section of the perforations made in a part of the crowbar, 4...Special material press-fitted into the hole, 5...Adhesive , 6... Claw portion at the front end of the crowbar, 7... Tip portion at the rear end of the crowbar, 8... Roadbed ballast, 9... Sleeper, 10... Rail, 11... Dog nail, 12...
Opposite rail, 13...The first position of the crowbar when pulling out the dog nail, 14...The position where the crowbar contacts the opposite rail, 15...The distance of the crowbar from 13 to 14, 16...The first position of the crowbar Paint applied to the area,
17... Electrical insulation material wrapped around a part of the crowbar,
18...Cut along the circumference of the barrel of the crowbar to create a concave circumference,
19...Special processing on both ends of 18 processing, 20...
...Regular circular cross section of the crowbar, 21, 22...Actual cross section of the crowbar.

Claims (1)

[Scope of utility model registration request] The required number of holes are made in the contact area with the opposite rail, and a part of the material with electrical insulation, shock resistance, abrasion resistance, and abrasion resistance is slightly protruded from the surface of the burl. , a safety crowbar made of press-fit adhesive for electrical insulation and injury prevention.