JP4406906B2 - Plunger type connecting pin - Google Patents

Description

  The present invention relates to a plunger-type joining pin for stopping a shaft and a cylindrical body fitted on the shaft. The plunger-type joining pin can be used, for example, when a socket is attached to the main shaft in a bolt and nut tightening tool.

  Conventionally, as a method of attaching the socket to the main shaft of the bolt or nut tightening tool in a replaceable manner, a simple columnar joining pin P1 shown in FIG. 7 or a plunger-type joining pin P2 shown in FIG. 8 is used. There is something that uses.

“Mounting with cylindrical joint pin P1”
As shown in FIG. 7, a cylindrical joining pin P <b> 1 is inserted into the pin holes 90 and 80 formed in the main shaft 9 and the socket 8 of the tightening tool and the socket 8 is attached to the main shaft 9. The O-ring R is fitted into a circumferential groove 81 formed at a position where the opening is opened (for example, Patent Document 1).

"Mounting with plunger-type joining pin P2"
As shown in FIG. 8, the plunger-type joining pin P2 includes a pin body 83 including a small diameter portion 83a and a large diameter portion 83b connected to the small diameter portion 83a, a coil spring 84, and a lid body 85. The pin hole 93 provided in the vicinity of the tip of the main shaft 9 is accommodated in such a manner that only the end portion of the small diameter portion 83a protrudes. Therefore, when this plunger type locking pin P2 is used, the pin hole 93 is stepped 94 so that only the small diameter portion 83a passes from the open end on the one end side so that the pin body 83 is prevented from coming off.

  When this plunger-type joining pin P2 is used, the socket 8 is externally fitted with the pin body 83 pushed into the main shaft 9, and the pin body 83a is inserted into the pin hole 86 formed in the socket 8 by the biasing force of the coil spring 84. To insert.

(Problems of the above-mentioned two types of joining pins P1 and P2)
However, in the case of the joining pin P1, it is necessary to fit the O-ring R into the circumferential groove 81 after inserting the cylindrical joining pin P1 into the pin holes 90 and 80.

  In addition, in the case of the plunger-type joining pin P2, there are three components, and the assembly to the pin hole 93 cannot be performed with one operation, and the assembly work is troublesome. Furthermore, the processing of the pin hole 93 is also troublesome.

  On the other hand, the shape of the hole of the pin hole 90 and the pin hole 93 is different, and only a joining pin suitable for each could be mounted.

The above-described problem is not limited to the case where the socket is attached to the main shaft in the tightening tool, and there is a similar problem in attaching the two members with the joining pins.
JP-A-9-29651

  Therefore, in the present invention, (1) work after inserting the joining pin into the pin hole is not required, (2) it can be attached to the pin hole used for the cylindrical joining pin, and (3) the pin is operated in one operation. It is an object of the present invention to provide a plunger-type joining pin that can be mounted in a hole.

(Invention of Claim 1)
The present invention relates to a plunger-type joining pin that is inserted into a pin hole formed in the second member in order to attach the second member so as to be fitted to the first member.
A pair of cylindrical bodies each having an insertion hole on one end face are arranged in the same straight line in such a manner that both insertion holes face each other, and are formed by the opposing cylindrical wall edge of each cylindrical body. The cylindrical bodies are in a state in which they cannot be separated from each other due to the mutual catching, and each end portion of the compression coil spring compressed in the insertion hole of the cylindrical body is fitted.

(Invention of Claim 2)
The plunger-type joining pin according to the present invention relates to the invention according to claim 1, wherein one cylindrical body is a fixed portion that is forcibly inserted into the pin hole of the first member, and the other cylindrical body is the pin hole of the first member. It is a moving part inserted so that it can be pushed in.

(Invention of Claim 3)
The plunger-type joining pin according to the present invention relates to the invention described in claim 2 above, and an inclined surface is formed on the other cylindrical body over the upper surface and the peripheral surface connected thereto.

  In the plunger-type joining pin of the present invention, (1) work after inserting the joining pin into the pin hole is not required, (2) it can be attached to the pin hole used for the cylindrical joining pin, and (3) Can be installed in the pin hole by operation.

  Hereinafter, an embodiment as the best mode for carrying out the water tank S of the present invention will be described in detail.

  1 is a sectional view showing a state in which a socket 6 is replaceably attached to a main shaft 5 of a tightening tool by a plunger-type joining pin P according to Embodiment 1 of the present invention. FIG. 2 is a sectional view taken along line XX in FIG. 3 is a cross-sectional view of the plunger-type joining pin P, FIG. 4 is an explanatory view of the cutout state of the cylindrical bodies 1 and 2, and FIG. 5 is an exploded perspective view of the plunger-type joining pin P.

(About this plunger joint pin P)
As shown in FIGS. 1 and 2, the plunger-type connecting pin P is attached to the main shaft 5 (first member described in the section for solving the problem) of a tightening tool for tightening bolts and nuts. In order to attach the socket 6 (corresponding to the second member described in the column in the means for solving the problem) in an externally fitting manner, it is inserted into the pin holes 50 and 60 formed in these, FIG. As shown in FIG. 5, it is composed of a cylindrical body 1 on the moving part side, a cylindrical body 2 on the fixed part side, and a compression coil spring 3 interposed between the cylindrical bodies 1 and 2.

  As shown in FIGS. 3 to 5, the cylindrical body 1 is formed with a circular insertion hole 11 that opens to the lower end side. The cylindrical wall portion indicated by the oblique lines in FIG. And the contact part 12 is comprised. The diameter of the cylindrical body 1 is about 0.1 mm smaller than the pin hole 50.

  As shown in FIGS. 3 to 5, the cylindrical body 2 is formed with a circular insertion hole 21 that opens to the upper end side. The cylindrical wall portion indicated by the oblique lines in FIG. And the contact part 22 is comprised. The diameter of the cylindrical body 2 is about 0.03 mm larger than the pin hole 50.

  As shown in FIG. 3, the compression coil spring 3 has a coil diameter that can be inserted into the insertion hole 11 and the insertion hole 21 with some margin so as not to inhibit expansion and contraction.

  Here, as shown in FIG. 3, the plunger-type joining pin P is inserted into the insertion hole 11 of the cylindrical body 1 at one end and the other end of the compression coil spring 3 into the insertion hole 21 of the cylindrical body 2. At the same time, it can be formed into a straight cylindrical shape such as a single joining pin that is not easily deformed by hooking the locking piece 10 and the locking piece 20. In this state, the center lines of the cylindrical body 1 and the cylindrical body 2 coincide with each other, the end of the locking piece 10 is in contact with the contact part 22, and the end of the locking piece 20 is in contact with the contact part 12. Yes. When a force is applied to bring the cylindrical body 1 and the cylindrical body 2 close to each other, the cylindrical body 1 approaches the cylindrical body 2 against the urging force of the compression coil spring 3, and the total length of the stroke S shown in FIG. Only shortened.

  In this plunger-type joining pin P, when the cylindrical body 1 protrudes from the surface of the main shaft 5 as shown in FIG. It is necessary to be in the pin hole 50.

(About the excellent point of this plunger type connecting pin P)
"Attachment work of this plunger type connecting pin P to the pin hole 50"
Since this plunger-type joining pin P has a straight cylindrical shape like a single joining pin that does not lose its shape, the plunger-type joining pin P may be fitted into the pin hole 50 without breaking this state. That is, the plunger-type joining pin P can be mounted in the pin hole 50 with one operation.
“This plunger joint pin P does not require a stepped portion in the pin hole 50”
In this plunger-type joining pin P, the diameter of the cylindrical body 1 is about 0.1 mm smaller than that of the pin hole 50, so that the cylindrical body 1 can be pushed and returned smoothly, and the diameter of the cylindrical body 2 is the pin hole 50. Since it is only about 0.03 mm in diameter, it will be firmly fixed without being accidentally dropped off. Further, the cylindrical body 1 and the cylindrical body 2 are firmly locked by the locking pieces 10 and 20.

  Therefore, the plunger-type joining pin P is not inadvertently dropped or the cylindrical body 1 is not pulled out. That is, with this plunger-type joining pin P, it can also be attached to a pin hole used for a cylindrical joining pin.

“No other work is required after the plunger-type joining pin P is mounted in the pin hole 50”
As described above, since this plunger-type joining pin P is firmly stopped, a subsequent operation such as fitting an O-ring is clearly unnecessary.

  FIG. 6 shows a plunger-type joining pin P according to Embodiment 2 of the present invention.

  The plunger-type joining pin P of the second embodiment is basically the same as that of the first embodiment, but as shown in FIG. 6, the inclined surface is inclined downward on the cylindrical body 1 toward the distal end side of the main shaft 5. The only difference is that T is formed. In the state where the cylindrical body 1 protrudes, the lowermost portion of the inclined surface T is accommodated in the hole 50.

  Therefore, when the socket 6 is fitted on the main shaft 5, the front wall 61 of the socket 6 presses the inclined surface T, so that the cylindrical body 1 automatically sinks into the pin hole 50 due to the cam mechanism. It will be. Therefore, the attachment work of the socket 6 to the main shaft 5 becomes easy.

(Other embodiments)
As in the above embodiment, the present invention is not limited to the mounting of the socket to the main shaft of the tightening tool, but can be similarly applied to the mounting of the two members by the joining pins.

Sectional drawing which shows the state which attached the socket to the main axis | shaft in a clamping tool so that replacement | exchange was possible with the plunger type joining pin of Example 1 of this invention, XX sectional drawing of FIG. Sectional drawing of the said plunger type joining pin. Explanatory drawing of the notch state of a cylindrical body. The disassembled perspective view of the said plunger type joining pin. Sectional drawing of the plunger-type joining pin of Example 2 of this invention. Sectional drawing of the joining pin which is a prior art. Sectional drawing of the plunger type joining pin which is a prior art.

Explanation of symbols

P Plunger type connecting pin T Inclined surface 1 Cylindrical body 2 Cylindrical body 3 Compression coil spring 5 Spindle 6 Socket 10 Locking piece 11 Insertion hole 12 Contact part 20 Locking piece 21 Insertion hole 22 Contact part 50 Pin hole 60 Pin hole

Claims (3)

In the plunger-type joining pin inserted into the pin hole formed in the first member in order to attach the second member in a manner of being externally fitted to the first member,
A pair of cylindrical bodies each having an insertion hole on one end face are arranged in the same straight line in such a manner that both insertion holes face each other, and are formed by the opposing cylindrical wall edge of each cylindrical body. Plunger joints characterized in that the cylindrical bodies are inseparable from each other due to the mutual catching, and each end of a compression coil spring compressed in the insertion hole of the cylindrical body is fitted. pin. The one cylindrical body is a fixed portion that is forcibly inserted into the pin hole of the first member, and the other cylindrical body is a moving portion that is inserted into the pin hole of the first member so as to be able to be pushed. 1. The plunger-type joining pin according to 1. 3. The plunger-type joining pin according to claim 2, wherein an inclined surface is formed on the other cylindrical body from the upper surface to a peripheral surface connected to the upper surface.

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