JPS5856117Y2 - Fixing device for switch actuation dog - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fixing device for a limit switch operating dog in a control device for a machine tool or the like.

Conventionally, a dog fixing device for operating a limit switch in a control device for various machines including machine tools such as a milling machine, a lathe, a drilling machine, a boring machine, and a broaching machine has been constructed as follows.

That is, as shown in FIGS. 1 and 2, an inverted T is formed on the groove plate 1.
A T-shaped groove 2 is formed, and a T-nut 3 is screwed into this T-groove 2.
The dog 4 was fitted into the upper part of the T-groove 2, and the sunken head bolt 5 was screwed into the dog 4 and the T-nut 3 to fix the dog 4, which had the following four drawbacks.

Since one nut 3 is used, it is necessary to form the T-slot 2 with a T-slot cutter, which takes a very long processing time.

2. The T-nut 3 is screwed into the T-groove 2, which is difficult to do.

3. Since the T-groove 2 must be provided in the groove plate 1, the groove plate 1 must be made of cast metal that is easy to process, resulting in weak strength and high cost.

4. The T-nut 3 easily falls into the groove 2 and is easily lost.The object of the present invention is to provide a device for fixing a switch operating dog which can eliminate such drawbacks.

Next, the structure and operation of the present invention will be explained with reference to the drawings.

1a is a grooved plate, and the lower part of the dog 4a fits into the groove 2a.

This dog 4a is restrained by a stepped portion 6 during fitting.

Reference numeral 7 denotes a groove cut into the dog 4a from below in the longitudinal direction, and the groove 7 is formed in the narrow portion.

Reference numeral 8 designates a straight incomplete screw having a diameter slightly smaller than that of the sunken head portion 5a and provided in the split groove portion 7 of the dog 4a so that the lower end portion gradually becomes smaller in diameter.

That is, the incomplete threaded portion 8 has a tapered diameter smaller toward the bottom surface of the dog.

9 is a groove into which the bolt head is fitted, and 10 is a convex portion for operating the limit switch 11.

In addition, the incomplete threaded portion 8 is formed to have the same diameter as the hole 5a, and to gradually become smaller toward one side of the dog bottom.

Thus, the dog 4a is fitted into the groove 2a of the groove plate 1a and restrained by the step 6, and then the pole 5a is press-screwed into the incompletely threaded portion 8 through the insertion hole 9.
As the hole 5a is screwed in, the incompletely threaded portion 8 is pushed out to the left and right through the groove 7, and pressurizes and tightens the inner wall surface of the groove 2a.

By providing a pair of actuating protrusions 9 on both ends of the upper surface of the dog 4a, the dog 4a can perform two functions of the conventional dog 4a.

As described above, the present invention provides the dog 4 that fits into the groove 2a.
A vertical groove 7 is provided in the entire longitudinal direction of a, and this groove 7
In addition, the diameter is the same as that of the bolt 5a or slightly smaller than the bolt 5a, and the incomplete thread part 8 is formed so that the diameter gradually becomes smaller at the lower end. By simply screwing the pin 5a into the portion 8, the dog 4a is pushed out to the left and right by the split groove 7 and the screw portion with a smaller diameter, so that the dog 4a is firmly pressurized and tightened against the inner wall surface of the end portion 2a. Since there is no need to provide the conventional T-slots 2 and T-nuts 3 on the groove plate 1a, the time-consuming work of using a T-slot cutter and the difficult work of screwing the T-nuts 3 into the T-slots 2 are eliminated, and the machining time is reduced. It will be extremely short, reducing costs.

Further, since it is not necessary to provide the T-groove 2 in the groove plate 1a, there is no need to use a casting, and although an iron plate or the like can be used, it is superior in strength and is inexpensive.

Furthermore, the present invention is compatible and highly practical since it can use standard bolts instead of the tapered shaft screws known in Japanese Utility Model Publication No. 29-3007.

In addition, the structure is simple, and the door lug 4a is firmly fixed in one step of press-screwing the hole 5a, so it has a great practical effect.

In addition, compared to the case of Kojitsu Publication No. 30-1319, in which cut grooves are provided in the tubular main body provided with a female screw having a complete thread part, and the fitting is performed by the restoring force of each divided elastic piece, in this invention, the groove part 2a A directional split groove 7 is provided at the bottom, and an incomplete threaded portion 8 is formed in the split groove 7 to form a vertical threaded hole, and the bolt 5 is screwed into the incomplete threaded portion 8. This is an excellent dog fixing device that is easy to handle and has a fixing force sufficient to withstand the operating force of the limit switch 11.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1, FIG. 2 is a sectional view of a conventional device, FIG. 3 is a perspective view of this invention, FIG. 4, FIG. 5 is a sectional view of the same, and FIGS. 6 and 7. is a sectional view of the device of the present invention. 1...Groove plate, 2...T groove, 3...T nut, 4...
...Dog, 5...Bolt.

Claims (1)

[Scope of utility model registration request] In a dog fixing device in which the upper part on which the operating convex part is formed is wide and the lower part is narrow, and the stepped part is fitted into the groove part, a split groove in the longitudinal direction of the groove is formed in the narrow part, and a fitting hole is formed in the upper surface of the dog. A screw hole is formed vertically in the split groove portion, a tapered incomplete screw portion with a small diameter is formed near the bottom surface of the dog, and a bolt is screwed into the screw hole to form a step of the dog. A fixing device for a switch actuation dog, characterized in that the part is pressurized and stopped on the inner wall surface of the groove part.