JP2564473B2 - Double nut socket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double nut socket (hereinafter, simply referred to as a socket). More specifically, it is a socket for simultaneously screwing and fastening a plurality of nuts to a single bolt, so that the nuts do not stick to each other (hereinafter referred to as a lock) during the fastening process and are smoothly screwed and fastened. For sockets that can

[0002]

2. Description of the Related Art In various structures or devices, various bolts and nuts are used as fastening means and fixing means, and these are shown in FIG. 5 to prevent them from loosening. A method using a so-called lock nut in which such two nuts Nb and Na are continuously screwed to the bolt B (herein referred to as a double nut) is widely adopted. Further, since a spare nut may be screwed onto the bolt in some cases, the number of nuts may be triple or more.

In such a case, usually, nuts are screwed onto bolts one by one and fastened one by one with a spanner or wrench.
Therefore, since many structures and devices have many bolt fastening portions, the fastening work time becomes very long, which is one of the causes of an increase in the cost of assembling and repairing the structures and devices.

On the other hand, as a method of simultaneously screwing a plurality of nuts (mainly two nuts) onto a bolt, a method of housing two nuts in a recessed portion of a socket such as a wrench and then directly screwing them onto the bolts Has been implemented, but it has not been as effective as expected. That is, since the two nuts are screwed on the bolt in a state where they are in close contact with each other, the finished dimension error of the nut and the socket portion, the influence of gravity between the nuts,
It is also reported that due to various factors such as the difference in frictional resistance of the threaded part between the nuts, and various other factors, the nuts may lock up in the middle of the bolt before they are fastened at the predetermined position and torque. ing.

A double nut tightening socket disclosed in Japanese Patent Publication No. 58-33062 is also of the above type.
That is, the two nuts are temporarily fixed to the bolt by a separate means in advance, and then the nut runner is rocked to the left and right to fit the two nuts into the socket and drive them to rotate. Therefore, the problem that the lock is generated due to tightening the two nuts in close contact with each other as described above is required in addition to the need to temporarily fix the nuts.

The present invention has been made to solve the above problems, and when a plurality of nuts are simultaneously screwed and fastened to a single bolt, the nuts are not locked during the fastening process and the nuts are smooth. It is intended to provide a socket that can be screwed and fastened to a socket.

[0007]

According to a first aspect of the present invention, there is provided a socket having a plurality of nut engaging recesses, each of which is capable of accommodating a nut formed continuously and coaxially. Each of the nut engaging recesses has a plurality of corners on its inner peripheral surface capable of engaging with the outer peripheral corners of the corresponding nut, and the bottom side is provided between the corners. The inner peripheral surface has a plurality of corners through which the outer peripheral corners of the nut accommodated in the nut engaging recesses can pass, and the depth of each nut engaging recess from the opening end to the second or less Are formed to be slightly deeper than the thickness of the corresponding nuts.

According to a second aspect of the present invention, there is provided an outer socket, an inner socket axially slidably fitted in a recess of the outer socket, a lower surface of the inner socket and a bottom portion of the outer socket. The inner socket is fixed to the outer socket such that the inner socket cannot rotate relative to the outer socket and cannot come out of the opening of the outer socket, and the recess of the inner socket is continuous. It is composed of a plurality of nut engaging recesses each capable of accommodating a nut formed coaxially with each other, and each of the nut engaging recesses is capable of engaging with the outer peripheral corner of the corresponding nut. The inner peripheral surface has a plurality of corners which have corners on the inner peripheral surface thereof and through which the outer peripheral corners of the nut accommodated in the nut engaging recesses on the bottom side can pass between the corners. Each nut engagement from the opening end to the second and below It is characterized in that the depth of the place, which are slightly deeper than the thickness of the nut corresponding to each.

The cross-sectional shape of the recess of the outer socket is made polygonal, and the cross-sectional shape of the outer shape of the inner socket is made polygonal corresponding to the recess of the outer socket to prevent mutual rotation of the inner and outer sockets. The structure for
As a result, the strength is improved and the cost is reduced, which is preferable.

[0010]

According to the socket of the first aspect of the present invention,
A plurality of nuts can be accommodated in the recess.
Further, since the depth of each nut engaging recess is deeper than the thickness of the nut, a predetermined gap is secured between these nuts. Therefore, when the socket is rotated and the nut group is screwed to the bolt, the nuts do not come into close contact with each other and do not lock each other.

According to the socket of the second aspect of the present invention, in addition to the function and effect of the socket of the first aspect, for example, if a rotary drive device such as a nut runner is connected to the outer socket of the socket, the socket can be quickly operated. In addition, it is possible to smoothly and automatically fasten multiple nuts.

[0012]

Embodiments of the socket of the present invention will now be described with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing an embodiment of the socket according to the first aspect of the present invention, and FIG. 2A is an embodiment of the socket according to the second aspect of the present invention. 2B is a sectional view taken along line II-II of FIG. 2A, FIG. 3A is a sectional view taken along line III-III of FIG. 2B, and FIG.
2B is a sectional view taken along line IV-IV of FIG. 2B, and FIG.
FIG. 7 is a diagram illustrating the use of the socket.

The socket of the present invention is not limited to two and can be applied to a larger number of nuts. However, since there are usually two nuts, two sockets will be taken up in the following embodiments. In FIG. 1, reference numeral 1 is a socket, and a lower nut engaging recess (hereinafter referred to as a lower recess) 2 for a lower nut is formed on the bottom side inside thereof, and communicates with the opening side of the lower recess 2. An upper nut engaging recess (hereinafter referred to as an upper recess) 3 for the upper nut. Here, the direction of the open end of the socket 1 is the upper side, and the direction of the bottom is the lower side. The depth of the lower recess 2 is larger than the thickness of the lower nut. The depth of the upper recess 3 (the dimension from the upper end of the socket to the step 4 described later) is substantially the same as the thickness of the upper nut. Since this socket 1 is for a hexagon nut, the lower recess 2 has a regular hexagonal cross section. Also, the upper recess 3 above it is also for a hexagon nut, but in order to allow the hexagon nut (lower nut) housed in the lower recess 2 to pass, the two regular hexagons are offset from each other by 30 °. It has a star-shaped cross section of a regular dodecagon. As a result, the upper recess 3 and the lower recess 2
At the boundary between and, six step portions 4 having only hexagonal corners are formed.

An opening 5 is formed at the bottom of the socket 1 to prevent interference with a bolt that enters when the nut is screwed into the bolt. And at its lower end,
For example, a connecting portion 6 for connecting an operating handle or a nut runner (not shown) is formed.

When the lower nut and the upper nut are inserted into the socket 1 having such a structure, the upper nut is placed on the step portion 4 located slightly above the upper surface of the lower nut, and a gap is formed between the upper and lower nuts. It is accommodated in each of the recesses 3 and 2 in a closed state. The size of this gap can be changed by changing the depth of the lower recess 2, but since it is not necessary to fit the upper and lower nuts in close contact with each other, it is preferable to make the depth of the lower recess 2 as shallow as possible within that range. It is preferable in terms of making the socket compact. Especially, it is better not to make it more than twice the nut thickness.

When the present socket 1 is used to fasten a double nut, first the tip of the bolt is applied to the screw hole of the upper nut and the socket is rotated while being pressed. Then, the upper nut is screwed on the bolt, and finally the upper nut tries to come out upward from the upper recess, and its upper end surface is pressed against the object to be fastened (W in FIG. 5) to be fastened. At that time, the tip of the bolt is already screwed into the lower nut, and the lower nut is screwing on the bolt with a slight gap from the upper nut, so shift the socket downward and engage with the upper nut. Unlock and rotate further. Then, the lower nut is also fastened by pressing its upper end surface against the lower end surface of the upper nut. In this way, the double nut can be easily fastened to the bolt.

FIG. 2 shows a so-called double socket type socket 7 which utilizes the socket 1 (see FIG. 1) of the above embodiment. That is, the inner socket 8 having the same internal structure as that of the socket 1 is installed inside the outer socket 9 having a cylindrical shape with a bottom. The outer shape of the inner socket 8 has a hexagonal column shape, and the recess 9a of the outer socket 9 has a hexagonal column shape corresponding to the outer shape of the inner socket 8 (see also FIG. 3). Therefore, by rotating the outer socket 9, the inner socket 8 therein can also be rotated.

The lower surface of the inner socket 8 and the outer socket 9
A coil spring 10 is mounted in a compressed state to some extent between the bottom of the recess 9a. A circumferential groove 11 for a retaining ring is formed on the inner diameter side of the open end of the outer socket 9, and a known so-called C-shaped retaining ring 12 for preventing the inner socket 8 from protruding is formed in the groove 11.
The inner socket 8 is attached to the step portion 8a near the upper end of the inner socket 8 so as to be locked. Therefore, the inner socket 8 is always biased upward by the coil spring 10. Therefore, since the nut is always pressed against the lower end of the bolt when the bolt and the nut are fastened, if the tip of the bolt is applied to the upper nut and the socket 7 is rotated,
Make sure that the bolt is screwed into the screw hole of the nut. An opening 8b is formed in the bottom portion of the inner socket 8 so that a bolt entering when the nut is screwed into the bolt does not interfere with the bolt.

Similar to the socket of the above embodiment (FIG. 1),
As shown in FIG. 2 (b), the inner socket 8 of this socket 7 also has a lower recess 13 formed on the bottom side thereof, and communicates with the opening side of the lower recess 13 to communicate with the upper recess 14. Are formed. The depth of the lower recess 13 is larger than the thickness of the lower nut, and the depth of the upper recess 14 is substantially the same as the thickness of the upper nut. Further, as shown in the cross section of FIG. 3, the lower recess 13 has a regular hexagonal cross section (see FIG.
(B)), the upper recess 14 has two regular hexagons 30
It has a regular dodecagonal star-shaped cross section that is offset by ° (Fig. 3
(A)). Then, at the boundary between the upper recess 14 and the lower recess 13, six step portions 15 composed of hexagonal corners are formed (FIG. 2B). Therefore, this inner socket 8
Can have the same effect as the socket (1 in FIG. 1) of the above embodiment.

Further, since the present socket 7 is provided with the outer socket 9, it is preferably used for automatic fastening with an impact wrench equipped with a nut runner or the like. Reference numeral 16 is a mounting hole for mounting a driving device such as a nut runner, and 17 is a pin hole for the device.

The method of using the socket 7 will be described below with reference to FIG.

(1) First, two nuts (a lower nut Na and an upper nut Nb) are housed in the socket 7.

(2) Next, the socket 7 is pushed up to the position 4 (a) so that the lower end of the bolt B is brought into contact with the screw hole of the upper nut Nb. At this time, the coil spring 10 is compressed by the reaction of the bolt B, and the inner socket 8 descends in the outer socket 9.

(3) When the socket 7 is rotated in this state, the bolt B is screwed into the upper nut Nb as shown in FIG. 4 (b), and accordingly, the inner socket 8 is elastically urged by the coil spring 10 to cause the outer socket 9 to rotate. And then the lower end of the bolt B comes into contact with the screw hole of the lower nut Na.

(4) After that, or the socket 7
When the socket is pushed upward against the elastic force of the coil spring 10 together with the rotational drive of, the upper end surface of the socket 7 contacts the object W (weakly contacts) as shown in FIG. 4C.

(5) When the socket 7 is further driven to rotate in this state, the bolt B is screwed into the lower nut Na as shown in FIG. 4 (d). And the upper nut Nb
Since the lower nut Na and the lower nut Na both screw on the bolt while keeping a predetermined distance from each other, they are not locked. The inner socket 8 rises in the outer socket 9 by the elastic force of the coil spring 10, and eventually the upper nut Nb is brought into pressure contact with the object W to be fastened.

(6) Next, as shown in FIG. 4 (e), the socket 7 is lowered to move the upper recess 14 and the upper nut Nb.
And the lower nut Na is rotated.

(7) When the socket 7 is further driven to rotate in this state, the lower nut Na is eventually pressed against the upper nut Nb and fastened as shown in FIG. 4 (f).

The above work is continuously performed in a short time.

If the recess 9a of the outer socket is formed deeper and a coil spring having a longer free length is used, the upper end surface of the outer socket is gently pressed against the object to be fastened from the beginning of the fastening operation. Since the socket can be rotated, the vertical movement operation of the socket can be reduced. That is, the socket should be lowered only when the upper nut is pressed against the object to be fastened and fastened (which can be easily detected because the load torque rapidly increases). In particular,
The depth of the recess in the outer socket depends on the exposed length of the bolt from the object to be fastened (usually more than twice the nut thickness in the case of two nuts), the height of the inner socket, and the contact height of the coil spring. It will be a size with some margin added to.

Although the depth of each of the upper recesses 3 and 14 is substantially equal to the thickness of the nut,
The present invention is not so limited. The upper recess only may be formed, for example, shallower than the thickness of the nut or deeper than the thickness of the nut. In any case, as the socket rotates, the nut advances on the bolt and comes into pressure contact with the object to be fastened or the previously fastened nut in an attempt to move upward from the upper recess.

Even if the nut has the same diameter size, the thickness is not necessarily one kind. Therefore, it is versatile to select the nut thickness of the upper recess and the lower recess based on the thickest nut thickness. It is preferable from the viewpoint.

Further, although the sockets for hexagonal nuts have all been described in the above embodiments, the present invention should not be limited to hexagonal nuts. For example, the present invention also includes a socket in which the nut engaging recess has a quadrangular cross section, which is applicable to, for example, a square nut.

Furthermore, in the so-called double socket type embodiment (FIGS. 2 to 4), the cross-sectional shape of the recess of the outer nut and the outer cross-sectional shape of the inner nut are regular hexagons. It is not so limited. In short, it suffices to prevent mutual rotation of the outer nut and the inner nut and to allow the inner socket to slide in the recess of the outer socket in the axial direction thereof.
Known structures such as a polygon such as a pentagon, a heptagon, and an octagon, or a structure in which a groove in the socket axial direction and an umbilicus are meshed can be adopted.

[0036]

According to the present invention, when a plurality of nuts are screwed and fastened to one bolt at the same time, a predetermined gap is secured between these nuts, so that the nuts are in the middle of fastening. It can be screwed and fastened smoothly without locking each other.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a socket according to a first aspect of the present invention.

2 (a) is a plan view showing an embodiment of the socket according to the second aspect of the present invention, and FIG. 2 (b) is a sectional view taken along line II-II of FIG. 2 (a).

3 shows the socket of FIG. 2, FIG. 3 (a) is a sectional view taken along the line III-III of FIG. 2 (b), and FIG. 3 (b) is FIG.
It is the IV-IV sectional view taken on the line of (b).

FIG. 4 is an explanatory view of using the socket of FIG.

FIG. 5 is a perspective view showing an example of bolts and nuts after fastening to which the socket of the present invention is applied.

[Explanation of symbols]

 1 ... Socket 2 ... Lower recess 3 ... Upper recess 4 ... Step 7 ... Socket 8 ... Inner socket 9 ... Outer socket 10 ... Coil spring 13 ...・ Lower recess 14 ・ ・ ・ Upper recess 15 ・ ・ ・ Step B ・ ・ ・ Bolt Na ・ ・ ・ Lower nut Nb ・ ・ ・ Upper nut

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kazuo Mochizuki 1-6-5 Marunouchi, Chiyoda-ku, Tokyo East Japan Railway Company (72) Inventor Shigeo Mizude 3-chome, Higashikawasaki-cho, Chuo-ku, Kobe-shi, Hyogo No. 1 Kawasaki Heavy Industries Co., Ltd. Kobe factory (72) Inventor Kazuo Iizuka 2-6-5 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries Co., Ltd. Tokyo Design Office (56) Bibliography 61-195971 (JP, U) Real public Sho 37-10695 (JP, Y1)

Claims (3)

(57) [Claims] 1. A double-nut socket for axially connecting at least two nuts to be screwed to a bolt, wherein each socket has a concavity formed continuously and coaxially. Is formed of a plurality of nut engaging recesses, each nut engaging recess having a plurality of corners on its inner peripheral surface capable of engaging with the outer peripheral corners of the corresponding nut, and , The inner peripheral surface has a plurality of corners through which the outer peripheral corners of the nut accommodated in the nut engaging recesses on the bottom side can pass between the corners, and the second corner from the opening end A double nut socket in which the depth of each of the following nut engaging recesses is formed slightly deeper than the thickness of the corresponding nut. 2. A double nut socket for axially connecting at least two nuts and screwing the bolt onto a bolt, wherein the socket is an outer socket and is axially slidably fitted in a recess of the outer socket. And an inner socket, and a spring interposed between the lower surface of the inner socket and the bottom of the outer socket, the inner socket being incapable of mutual rotation with respect to the outer socket and from the opening of the outer socket. The inner socket's recess is made up of a plurality of nut-engaging recesses, each of which is contiguous and coaxial and can accommodate a single nut. A nut having a plurality of corners on its inner peripheral surface, the recesses being capable of engaging with the outer peripheral corners of the corresponding nut, and being housed in the nut engaging recesses on the bottom side between the corners. There are several corners that the outer corner can pass through. The socket for double nuts, which is formed on the inner peripheral surface of, and in which the depth of each of the nut engaging recesses second from the opening end is slightly deeper than the thickness of the corresponding nut. 3. A cross section of the recess of the outer socket has a polygonal shape, and a cross section of the outer shape of the inner socket has a polygonal shape corresponding to the recess of the outer socket. Double nut socket described in 2.