JPH08232929A - Connecting structure - Google Patents

Abstract

PURPOSE: To facilitate the attaching/detaching work of one shall member to/ from the other shaft member by composing a connecting pin of a magnetic body, and arranging a magnet to attract the connecting pin to the other end of a pin insertion hole. CONSTITUTION: When a bit 60 is fitted to a connecting adaptor 20, a taking-out rod is inserted from the clearance L to be secured between a pin insertion hole 25 of the connecting adaptor 20 and the circumferential surface of a pin attraction body 40, and a connecting pin 50 is pushed out of the pin insertion hole 25 of the connecting adaptor 20 against the attraction force of the pin attraction body 40. Then, the bit 60 is fitted and inserted to a connection hole 22, and a pin insertion hole 61 is matched with the pin insertion hole 25. Adjustment is made so that the pin insertion hole 61 may be matched with the pin insertion hole 25 when the bit 60 is inserted to the end of the connection hole 22. When the connecting pin 50 is inserted into the pin insertion holes 25, 61 in this condition, the bit 60 is prevented from coming off from the connection hole 22 of the adaptor 20 to allow them to be connected. Attachment/detachment of both members can be facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin formed in such a manner that the shaft hole of one shaft member is occupied by the other shaft member so as to intersect the shaft center of each shaft member. The present invention relates to an improvement of a connecting structure in which the one shaft member and the other shaft member are connected to each other by aligning the insertion holes with each other and inserting and arranging the connection pins from one end side of these pin insertion holes. is there.

[0002]

2. Description of the Related Art FIGS. 6 and 7 conceptually show a connecting structure of this type, which is provided between a drive shaft DS of a nut runner N and an adapter shaft AS in a screw fastening device, and the adapter shaft AS. 2 illustrates a connecting structure that connects two shaft members to each other between the socket and the socket S.

That is, in this screw fastening device, a drive shaft connecting hole DH for fitting the drive shaft DS and a shaft connecting hole SH for fitting the shaft portion of the socket S on the both ends of the adapter shaft AS. And a pin insertion hole TH is formed at both ends of the adapter shaft AS in a manner orthogonal to the shaft center, while the shaft shafts of the drive shaft DS and the socket S are respectively centered. The pin insertion holes DTH and STH are formed so as to be orthogonal to the pin insertion holes TH, DTH, and STH, respectively, and the connecting pin P
Between the drive shaft DS of the nut runner N and the adapter shaft AS, and the adapter shaft AS.
And the socket S are connected to each other.

[0004]

By the way, as is apparent from the drawings, in the conventional connecting structure, in order to prevent the connecting pin P from being accidentally dropped from the pin insertion hole TH, the adapter shaft AS is prevented. An elastic ring DR is attached to the outer periphery of the pin insertion hole TH by the elastic ring DR.
Both end openings are closed.

However, as described above, the elastic ring D
In the connection structure in which the R is mounted, when the adapter shaft AS is replaced with the nut runner N or the socket S is replaced with the adapter shaft AS, the connection pin P is removed before the connection pin P is removed. The elastic ring DR must be removed once, and after the connecting pin P is inserted and arranged, the elastic ring DR must be mounted again, which complicates the replacement work described above.

In view of the above situation, an object of the present invention is to provide a connecting structure capable of easily attaching and detaching one shaft member and the other shaft member.

[0007]

According to the present invention, the shaft member is formed so that it intersects with the shaft center of each shaft member by occupying the other shaft member inside the connecting hole formed in one shaft member. A connecting structure in which the one shaft member and the other shaft member are connected to each other by inserting and arranging the connecting pin from one end side of these pin inserting holes, The connecting pin is made of a magnetic material, and a magnet for attracting the connecting pin is arranged at the other end of the pin insertion hole.

It is preferable that the magnet is arranged so as to cover at least a part of the pin insertion hole.

The magnet is held by the one member, and the center of gravity of the connecting pin, when attracted to the magnet, is between the shaft center of the one shaft member and the magnet. It is preferable to occupy.

[0010]

According to the above construction, the connecting pin inserted into the pin insertion hole is prevented from falling off due to the attractive force of the magnet.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing an embodiment. FIG. 2 conceptually shows a screw fastening device to which an embodiment of the connection structure according to the present invention is applied. The screw fastening device exemplified here is a magnetic body having a bit fitting hole 1a having a square cross section on the base end surface and a thread groove 1b on the outer peripheral surface, for example, a drain plug 1 made of iron. Is used to fasten and loosen the work piece (not shown) in a screw hole formed in the work piece (not shown).
A connecting adapter 20 is provided at the tip of the drive shaft 11 connected to the.

As shown in FIGS. 2 to 5, the connection adapter 20 is in the form of a cylinder having a flange 21 on the outer circumference of the base end, and the bit fitting hole 1a extends from the tip end surface along the axis thereof. And a guide hole 23 that is substantially the same as the outer diameter of the drive shaft 11 is formed from the base end face along the axis of the connecting hole 22. A pair of regulating elongated holes 24 are formed on the peripheral surface located in the middle so as to face each other. The drive shaft 11 is inserted into the guide hole 23 and the drive shaft 11 is inserted.
By arranging the corresponding projecting end portions of the restriction member 12 fixed to the inside of the restriction elongated hole 24, the drive is performed within a range in which the restriction member 12 abuts the peripheral surface of the restriction elongated hole 24. It is supported on the drive shaft 11 in such a manner that it moves in the axial direction of the shaft 11. As is clear from FIG. 2, the connection adapter 20 is constantly urged toward the tip end side of the drive shaft 11 by the pressing force of the buffer coil spring 30 interposed between the connection adapter 20 and the flange 11a of the drive shaft 11. Has been done.

Further, the connecting adapter 20 has a pin insertion hole 25 formed at its tip, and a mounting hole 26 is formed at a portion located at one end of the pin insertion hole 25.
Are formed. The pin insertion hole 25 has a circular cross section, and is formed so as to extend perpendicularly to the axis of the connection adapter 20. The mounting hole 26 is the pin insertion hole 2 described above.
5, which has a columnar cross section having a diameter larger than that of 5, and is configured in such a manner as to include a part of the pin insertion hole 25 and which is orthogonal to the axis of the coupling adapter 20 as shown in FIG. And a pin adsorbent 40 is provided therein. The pin attracting body 40 is made of a permanent magnet and has a cylindrical shape having a size that fits into the mounting hole 26.
Further, as shown in FIG. 2, it is detachably held in the mounting hole 26 by a set screw 41 screwed to the connection adapter 20, and covers a part of the pin insertion hole 25.

Further, in the connection adapter 20, a connection pin 50 is inserted and arranged inside the pin insertion hole 25. The connecting pin 50 is made of a magnetic material such as iron and is homogeneous, and has a cylindrical shape with a diameter slightly smaller than that of the pin insertion hole 25 of the connecting adapter 20. It is adsorbed and held by the pin adsorbent 40. As is clear from FIG. 1, when the connecting pin 50 contacts the pin adsorbing body 40 through one end face, the position C, which is the middle in the longitudinal direction, is connected to the pin adsorbing body 40. It is formed to have a length arranged between the adapter 20 and the axis C '.

On the other hand, the bit 60 applied to this screw fastening device is in the form of a prism having a size that fits into the bit fitting hole 1a of the drain plug 1 described above, and is located at an intermediate position. It has a pin insertion hole 61. The pin insertion hole 61 has the same inner diameter as the pin insertion hole 25 formed in the connection adapter 20, and is provided so as to be orthogonal to the axis of the bit 60. The distance to the tip surface of the bit 60 is the above-mentioned connection adapter 20.
Is formed at a position larger than the distance between the tip end surface and the axis of the pin insertion hole 25.

Reference numeral 70 in FIGS. 2 and 4 denotes a plug attracting body buried in the tip end surface of the connecting adapter 20, and like the pin attracting body 40, is made of a permanent magnet. Further, reference numeral 27 in FIG. 2 is a communication hole that communicates between the connection hole 22 and the guide hole 23 in the connection adapter 20, and is formed in a circular cross-section having a diameter smaller than that of the connection hole 22. There is.

When the bit 60 is attached to the connecting adapter 20 in the screw fastening device configured as described above, first, a take-out rod having a small diameter prepared in advance, specifically, a pin insertion hole of the connecting adapter 20 is used. 25 and pin adsorbent 40
A take-out rod (not shown) that can be inserted into a gap L (FIG. 3) secured between the gap L and the peripheral surface of
By inserting this take-out rod from the
The connecting pin 50 is pushed out from the pin insertion hole 25 of the connecting adapter 20 against the suction force of.

Next, the connecting hole 2 of the connecting adapter 20.
The bit 60 is fitted and inserted into the pin 2, and the pin insertion hole 61 of the bit 60 and the pin insertion hole 25 of the connection adapter 20 are aligned with each other. At this time, the lengths of the bits 60 are previously set so that the pin insertion hole 61 of the bit 60 and the pin insertion hole 25 of the connection adapter 20 are aligned with each other when the bit 60 is inserted into the deepest part of the connection hole 22. And connection hole 22
It is preferable to adjust the depth of.

From this state, if the connecting pin 50 taken out previously is inserted into the pin inserting hole 25 of the connecting adapter 20 and the pin inserting hole 61 of the bit 60, the connecting pin 50 is inserted.
Thus, the bit 60 is prevented from coming off from the connection hole 22 of the connection adapter 20, and these two are connected to each other.

In this state, as shown in FIG.
Although one of the openings of the pin insertion hole 25 in the connection adapter 20 is left open, the connection pin 50 is moved by the pin adsorbent 40 to the pin insertion hole 25 of the connection adapter 20 and the pin insertion hole 25 of the bit 60. Since the connecting pin 50 is sucked and held by the pin suction member 40,
Even when the connecting pin 50 is disposed below the connecting pin 50, the connecting pin 50 does not drop out from the pin insertion hole 25 of the connecting adapter 20. Further, in order to fasten and loosen the drain plug 1 from the above state, the drive motor 10 is turned on to drive the drive shaft 1
1 and the connection adapter 20 are rotated at a high speed, as described above, the center C of the connection pin 50, that is, the center of gravity of the connection pin 50 is the axial center C ′ of the connection adapter 20. Since it is deviated to the side of the pin adsorbing body 40, the centrifugal force acting on the connecting pin 50 acts in the direction of pressing the connecting pin 50 against the pin adsorbing body 40, and the pin insertion hole 25 of the connecting adapter 20. There is no risk that the connecting pin 50 will fall out of the connecting pin 50.

On the other hand, when the bit 60 attached to the connecting adapter 20 is replaced due to factors such as wear and damage in the screw fastening device, the connecting adapter 2 is again used.
No. 0 pin insertion hole 25 and the peripheral surface of the pin adsorbent 40 is inserted into the pin L through the gap L secured between the pin adsorbent 4 and
Pin insertion hole 25 of connection adapter 20 against the attraction force of 0
The connecting pin 50 may be taken out from the. At that time, according to the screw fastening device, one of the openings of the pin insertion hole 25 in the connection adapter 20 is always open,
No previous work such as attaching and detaching the elastic ring is required as before, and the above-described work can be performed very easily.

In the above embodiment, the connection structure applied between the connection adapter and the bit in the screw fastening device is illustrated. However, if the shaft members are connected to each other, the other parts are of course used. Can also be applied.
Further, the connecting structure in which one shaft member has a cylindrical shape and the other shaft member has a prismatic shape is illustrated, but the cross-sectional shape of the shaft member may be any shape.

Further, in the above-mentioned embodiment, the connecting structure to which the permanent magnet is applied is exemplified, but it is not always necessary to apply the permanent magnet such as the electromagnet. Further, although the magnet is arranged so as to cover a part of the pin insertion hole, the present invention is not limited to this. For example, if a ring-shaped magnet is applied and the connecting pin is attracted from the surroundings, it is not necessary to cover the pin insertion hole at all, and if the connecting pin is pulled out from one opening, all the pin insertion holes are You can cover it. In the above embodiment, the magnet is arranged in the shaft member having the connecting hole, but the magnet can be arranged in the shaft member fitted in the connecting hole.

Further, in the above-mentioned embodiment, since the length of the connecting pin is configured so that the center of gravity of the connecting pin is occupied between the shaft center of the shaft member and the magnet when attracted to the magnet. Although a strong magnet that resists centrifugal force is not required, when applying a strong magnet, it is not necessary to occupy the center of gravity of the connecting pin between the axis of the shaft member and the magnet. When the position of the center of gravity of the connecting pin is occupied between the shaft center of the shaft member and the magnet, since the connecting pin having a uniform cylindrical shape is applied in the above embodiment, the intermediate position in the longitudinal direction is used instead. However, when applying non-uniform connecting pins such as stepped pins and taper pins, it is necessary to measure the position of the center of gravity in advance and occupy it between the shaft center of the shaft member and the magnet. It goes without saying that there is.

[0025]

As described above, according to the present invention,
Since the connecting pin inserted into the pin insertion hole is prevented from falling off due to the attractive force of the magnet, it is not necessary to close the opening of the pin insertion hole, and it is easy to attach and detach one shaft member and the other shaft member. It becomes possible to do it.

[Brief description of drawings]

FIG. 1 is a sectional view conceptually showing an embodiment of a connecting structure according to the present invention.

FIG. 2 is a sectional view conceptually showing a screw fastening device to which the embodiment structure of FIG. 1 is applied.

FIG. 3 is an arrow view III in FIG.

FIG. 4 is a view on arrow IV in FIG.

5 is a sectional view taken along line VV in FIG.

FIG. 6 is a sectional side view conceptually showing a conventional connecting structure.

7 is a sectional view taken along line VII-VII in FIG.

[Explanation of symbols]

 20 ... Connection adapter 22 ... Connection hole 25, 61 ... Pin insertion hole 40 ... Pin adsorption body 50 ... Connection pin 60 ... Bit C ... Intermediate position in the longitudinal direction of connection pin C '... Shaft center position of connection adapter

Claims (3)

[Claims] 1. A pin insertion hole formed in a manner intersecting with the axis of each shaft member is aligned with each other by occupying the other shaft member inside the connection hole formed in one shaft member. In a connecting structure in which the one shaft member and the other shaft member are connected to each other by inserting and arranging the connecting pin from one end side of these pin insertion holes, the connecting pin is made of a magnetic material. At the same time, a connecting structure is provided in which a magnet for attracting the connecting pin is arranged at the other end of the pin insertion hole. 2. The connection structure according to claim 1, wherein the magnet is arranged so as to cover at least a part of the pin insertion hole. 3. The magnet is held by the one member, and the center of gravity of the connecting pin, when attracted to the magnet, is between the shaft center of the one shaft member and the magnet. The connection structure according to claim 1, wherein the connection structure is occupied.