JPS597606Y2 - double set screw - Google Patents

Description

[Detailed description of the invention] A first fixed member is fitted into the fixed member of the present invention so as to be movable in the axial direction; This relates to a double set screw for fixing a second fixed member inserted thereinto at an arbitrary position in the axial direction. The object of the present invention is to provide a double set screw that can lock each member to be fixed at an arbitrary position.

The structure of the present invention will be explained in detail below based on the drawings.

1, 2, 3, 4 and 5 show an embodiment of the present invention, in which the headstock 1,
It is equipped with a tailstock 2, a grinding wheel 3, and a dimensional accuracy maintaining device 4, and the dimensional accuracy maintaining device 4 is connected to a tapered shaft 5 that fits into a tapered hole of the tailstock 2, and one end of the tapered shaft 5. Mounting stand 6
, a direction Y perpendicular to the axis X-X of the workpiece W is attached to the mounting base 6.
- a tip holder 7 attached to Y, the tip holder 7 includes a sleeve 8, a rod 9 fitted inside the sleeve 8;
A knob 10 for rotational operation attached to one end of this
, is equipped with a fine movement feed mechanism 13 including a female thread 11 formed on the sleeve 8 and a male thread 12 formed on the rod 9, and the other end of the rod 9 is provided with a fine movement feed mechanism 13 including a female thread 11 formed on the sleeve 8 and a male thread 12 formed on the rod 9. A hard tip 14 is also provided, and the tip 14
is set at the basic position O of the final finishing dimension of the workpiece, and gives relative rotation to the workpiece W and the grinding wheel 3, and the workpiece W to the grinding wheel 3.
Grinds the workpiece W with the grinding wheel 3 while giving a reciprocating motion X in the axial direction X-X and a cutting feed y, and the grinding wheel 3
The mount 6 of the grinding machine is capable of grinding down the grinding wheel 3 with the tip 14 and keeping the finished dimensions and surface roughness of the workpiece W constant during the cutting feed after reaching the final finished dimension of . Sleeve 8 and rod 9 of the tip holder 7
This figure shows a usage mode in which the double-piece screw 20 of the present invention is installed in a direction perpendicular to the axis of the tip holder and the sleeve 8 and rod 9 of the tip holder 7 are respectively locked to the mounting base 6.

The double screw 20 is constructed by combining a first set screw 21 and a second set screw 26.

In this embodiment, the first set screw 21 has a hexagonal head 22 formed in one half in the axial direction, a male thread 23 formed in the other half, and an end portion of the male thread 23. It has a cylindrical fitting part 24 having a diameter smaller than that of the male screw 23, and a female screw hole 25 formed to penetrate in the axial direction of the inside,
The male screw 23 is shaped to be screwed into a female screw 15 formed on the mounting base 6 which is a fixing member, and the fitting portion 24 is a thick part of the cylindrical sleeve 8 which is a first fixed member. In the first and second elongated holes 16 and 17, which are formed in two stages wide and narrow in a direction parallel to the axis, a first length having a wide width d1 near the outer periphery {
It is formed to a diameter that fits into L16.

The second set screw 26 has a male thread 27 shaped to be screwed into the female screw hole 25 of the first set screw 21, and a hexagonal wrench fitting hole 28 formed in the head. The male screw 27 has a narrow width d2 formed near the axis of the sleeve 8.
The diameter of the second long hole 17 is smaller than that of the second elongated hole 17 .

In the illustrated usage mode, the above-mentioned double set screw 20 has the first and second lengths {L16, 17, the male thread 23 of the first set screw 21 is screwed into the female thread 15 of the mounting base 6, and the sleeve 8
The first set screw 21 is half-fitted into the outer elongated hole 16 with the fitting part 24 at the tip thereof facing, and the first and second set screws 2
1. 26 is loosened, that is, the end surface of the fitting portion 24 of the first set screw 21 is inserted into the first elongated hole 16, which is formed into a step with the second elongated hole 17 of the sleeve 8. The second set screw 26 is located at a distance from the stepped bottom surface.
With the end face of the rod 9 in a position away from the side surface of the rod 9, the sleeve 8 is slid in the axial direction Y-Y within the mounting base 6, and the tip 14 is moved to the reference position O for the final finishing dimension of the workpiece W. After making a rough adjustment, only the first set screw 21 is tightened, and the end surface of the fitting portion 24 of the first set screw 21 is brought into contact with the stepped bottom surface of the first elongated hole to lock the sleeve 8. By rotating the knob of the dimensional accuracy maintenance device 4, the rod 9 is slightly moved in the axial direction Y-Y via the fine movement feed mechanism 13, and the tip 14 is adjusted to the reference position O for the final finishing dimension of the workpiece W. , tighten the second set screw 26, and press the end face of the second set screw 26 into the lock. The rod 9 is locked by contacting the side of the tip 9, and the tip 1 is locked.
4 to the reference position O accurately.

In the above usage mode, the sleeve 8 is fixed by the first set screw 21 so as not to move in the axial direction Y-Y or in the circumferential direction, and the first set screw 21 is screwed inside the sleeve 8. 2 set screws 26 fix the rod 9 so that it does not move in either the axial direction YY or the circumferential direction.

6 and 7 show another embodiment of the present invention, in which a fitting hole 29 for a hexagonal wrench is formed at the upper end of the inside of the first set screw 21. , similar to the previous embodiment.

The present invention has the structure and operation described in detail above, and is achieved by the cooperation of the first set screw 21 and the second set screw 26 screwed into the female threaded hole 25 formed through the inside thereof. , a set screw has the remarkable effect of reliably and easily fixing the fixing member and the first and second fixed members superimposed thereon.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a mode of use in which the present invention is applied to fix a sleeve and a rod to a mounting base of a dimensional accuracy maintenance device of a grinding machine, and Fig. 2 is a plan view of a usage pattern taken from II to II in Fig. 1.
Figure 3 is an enlarged cross-sectional view along line III in Figure 2;
Figure 4 is a plan view of the double set screw, Figure 5 is V-V in Figure 2.
6 is a longitudinal sectional view of another embodiment of the present invention, and FIG. 7 is a plan view thereof. 6...Mounting base, 8...Sleeve, 9.
・Bent rod, 16...First elongated hole, 17...
...Second long hole, 20...Entire double curved set screw, 21.
...First set screw, 22... Head of the first set screw, 23... Same male screw, 24... Same insertion part, 25...・・Same female screw hole, 26・・・・
・Second set screw, 27... Male thread of the second set screw, 28, 29... Fitting hole that is the fitting part of the screwdriver tool.

Claims (1)

[Scope of utility model registration request] A thick cylindrical first member to be fixed is fitted into the fixed member so as to be movable in the axial direction, and a second member is fitted into the first member to be movable in the coaxial direction. The fixed member is
Each of them is arranged so as to be fixed to the fixing member with a single set screw at an arbitrary position in the axial direction, and the single set screw has a male thread formed on its outer circumferential surface and a male screw at the end of the male thread. A first set screw having a cylindrical fitting portion with a smaller diameter than the male screw extending therein and having a coaxial female screw hole penetrating therein, and a male screw screwing into the female screw hole having a shape or shape. and a second setscrew whose head is provided with a fitting portion for a screwdriver, and the male thread of the first setscrew extends in a direction perpendicular to the axes of both fixed members. The fitting part is a long hole that is screwed into the fixing member and is formed in a side surface of the first fixed member in two stages, wide and narrow, in a direction parallel to the axis of the first fixed member. The diameter of the second set screw is such that it can be inserted and slid into a wide first elongated hole formed near the outer periphery of the first fixed member, and the second set screw has a diameter that allows the second set screw to fit into and slide into a wide first elongated hole formed near the outer periphery of the first fixed member. the first of the holes
The diameter of the fitting portion is such that it projects into a narrow second elongated hole drilled near the axis of the fixed member and does not come into contact with the second elongated hole. A double set screw, characterized in that the surface has a length such that it can come into contact with the stepped bottom surface of the first elongated hole.