JPH05180207A - Stopper device for slide shaft-body - Google Patents

Abstract

PURPOSE:To positively prevent a shaft-body from unintentionally moving in its axial direction without requiring machining of the shaft-body by forming an engaging-locking groove, the depth of which is changed, on a part of the peripheral surface of the stem-part of a stopper member for abutting on the outer peripheral surface of the slide shaft-body, thereby preventing the axial movement of the shaft-body. CONSTITUTION:In a columnar slide shaft-body 1 which is guided and supported by a cylindrical bearing member 2 so that it can slide in its axial direction, a holding hole 3 having an axis- line A is formed in the bearing member 2, in a plane intersecting the axis-line of the shaft- body 1 and at a position at which the hole is in contact with the peripheral surface of the shaft body 1 or close to the peripheral surface of the shaft-body, and the stem part 5 of a stopper member 4 is inserted into the holding hole 3. Further, an engaging-locking groove 9 extending in the circumferential direction of the stem part 5 is formed in the middle part of the stem part 5 of the stopper member 4. The engaging-locking groove 9 is formed with circles having the center B at a position off-centered from the axial-line A of the stem part 5, and the radius of the deepest part 9A is designed to be in conformity with the outer peripheral surface of the shaft-body 1, and thus the sliding movement of the shaft-body 1 can be prevented by bringing the shaft-body 1 with the engaging-locking groove 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper device for preventing movement of a slide shaft in the axial direction.

[0002]

2. Description of the Related Art As a stopper device of this type, for example, a flat portion is formed by cutting a part of the peripheral surface of a slide shaft body, and the slide shaft body is used as a bearing member for guiding and supporting the slide shaft body. A female screw portion is formed in a holding hole formed in a direction substantially perpendicular to the female screw portion, and a stopper screw is screwed into the female screw portion from the outside so that the leading end portion of the stopper screw is perpendicular to the flat portion of the shaft body. It is known that it is pressed against. Thus, the slide shaft body is held at a predetermined position in the axial direction.

[0003]

However, the known stopper device described above has the following problems.

When the screw of the stopper is loosened, the slide shaft becomes movable, and depending on the device that employs this stopper device, the slide shaft may move unexpectedly and cause a serious accident. Sometimes. To prevent this, the flat portion must be deeply formed.

However, if the stopper screw is loosened to some extent, the slide shaft can be moved within the range of the flat portion.

[0006] The flat portion has to be processed on the slide shaft body, which requires time and labor. The slide shaft body is usually made of a material having a high hardness, and it is extremely difficult to process the flat portion on the slide shaft body.

[0007] While the stopper screw is tightened, the top portion of the stopper screw is strongly pressed against the flat portion, so that the flat portion is easily damaged. When the scratches become deep, even if it is desired to fix the slide shaft body at a position adjusted by slightly shifting the position of the slide shaft in the axial direction, the stopper screw enters the scratches and always stays at the same position.

Further, it is possible to press the stopper screw against the cylindrical outer peripheral surface of the slide shaft body without forming the flat portion, but in that case, scratches cause galling between the slide shaft body and the bearing member, You will not be able to slide smoothly.

The present invention solves the problems of the conventional device, can be manufactured relatively easily without any processing of the slide shaft, and can prevent accidental movement of the slide shaft. An object of the present invention is to provide a stopper device for a slide shaft.

[0010]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is to provide a slide shaft body, a bearing member for guiding and supporting the slide shaft body so as to be axially movable in a bearing hole surface, and the bearing member. A stopper member having a shaft portion that is held in the formed holding hole and that prevents the slide shaft body from moving in the axial direction by coming into contact with the peripheral surface of the slide shaft body, The stopper member is located in a plane in which the axis of the shaft portion intersects the axis of the slide shaft body and is in contact with or in the vicinity of the peripheral surface of the slide shaft body,
The shaft portion is movable in the axial direction thereof, and a locking groove is formed in a part of the peripheral surface of the shaft portion to contact and receive the peripheral surface of the slide shaft body. Is gradually reduced at least toward one side in the circumferential direction of the shaft portion.

[0011]

According to the present invention having the above-mentioned structure, the stopper member is inserted into the holding hole of the bearing member, and the shaft portion of the stopper member is rotated around its axis so that the engaging groove of the shaft portion is formed in the bearing. The stopper member is brought to a position corresponding to the bearing hole surface of the member, and the stopper member is held in this state. In such a state, the slide shaft body is inserted into the bearing hole of the bearing member while being slid into the bearing hole surface and the locking groove of the stopper member, and is set at a predetermined position in the axial direction. Then, the holding force of the stopper member is released.

In the device of the present invention assembled in this way, when the slide shaft is about to move from the predetermined position, a friction torque is generated in the engaging groove of the stopper member that comes into contact with the slide shaft. Try to rotate the shaft of the member. However, since the locking groove is formed to be gradually shallower in the circumferential direction, rotation of the shaft portion, that is, movement of the slide shaft body is prevented by the wedge action.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partially cutaway exploded perspective view of the first embodiment device. In the figure, reference numeral 1 denotes a cylindrical slide shaft body, and in the case of the present embodiment, it is guided and supported by a cylindrical bearing member 2 so as to be slidable in the axial direction. The bearing member 2 is usually fixedly provided on a supporting member (not shown) such as a frame or a housing of various devices.

As shown in FIGS. 2 and 3, the bearing member 2 is in the plane (the plane orthogonal to this embodiment) intersecting the axis of the slide shaft 1 and the peripheral surface of the slide shaft 1. A holding hole 3 having an axis A is formed at a position in contact with or in the vicinity thereof, and the shaft portion 5 of the stopper member 4 is inserted into the holding hole 3. The holding hole 3
Is set so that its diameter circle interferes with the bearing hole 2A of the bearing member 2.

The stopper member 4 has a handle 6 at one end of the above-mentioned shaft 5, and a recess 7 is formed at the other end as shown in FIG. 2, in which a compression spring 8 is partly formed. It is housed so as to project. The compression spring is not essential in the present invention.

As shown in FIG. 4, a locking groove 9 extending in the circumferential direction of the shaft portion 5 is formed in the middle portion of the shaft portion 5. As shown in FIG. 5, the locking groove 9 is formed by a circle having a center B at a position eccentric with respect to the axis A of the shaft portion 5, and the radius at the deepest portion 9A is the outer peripheral surface of the slide shaft body 1, That is, it is substantially the same as the radius of the bearing hole 2A of the bearing member 2. Therefore, the depth of the locking groove 9 becomes smaller as it shifts from the deepest portion 9A in the circumferential direction of the shaft portion 5.

The apparatus of this embodiment having such a structure is used in the following manner.

When assembling the apparatus, first, the shaft portion 5 of the stopper member 4 is inserted into the holding hole 3 of the bearing member 2 in a state where the slide shaft body 1 is not inserted into the bearing member 2.

Next, while pushing the stopper member 4 against the reaction force of the compression spring 8, the handle 6 is appropriately rotated so that the deepest portion 9A of the engaging groove 9 of the shaft portion 5 is located radially inward of the bearing member 2. Set the position to face and hold that position.

Next, the slide shaft body 1 is inserted into the bearing hole 2A of the bearing member 2. The slide shaft body 1 is inserted through the locking groove 9 of the stopper member 4 while being in contact therewith. Then, the slide shaft body 1 is brought to a predetermined axial position. Then, the holding force of the stopper member 4 is released. Thus, the assembly of the device of this embodiment is completed.

In the apparatus of this embodiment, when the slide shaft 1 is moved in the axial direction from the set predetermined position after the assembly, the slide shaft 1 is locked by the locking groove 9 of the stopper member 4. Friction torque is applied to try to rotate the stopper member 4 about its axis A. However, the locking groove 9 comes into contact with the slide shaft body at the deepest portion 9A, and becomes gradually shallower when it shifts in the circumferential direction, so that it cannot rotate due to the wedge action. That is, the axial movement of the slide shaft body 1 is prevented. In the case of the present embodiment, in particular, since the stopper member 4 is elastically pressed in the direction of the axis A by the action of the compression spring 8, the friction torque acts more reliably.

In order to remove the slide shaft 1 from the bearing member 2, the stopper member 4 is pushed against the reaction force of the compression spring 8 and the stopper member 4 is prevented from rotating. The slide shaft body 1 may be pulled while holding the handle 6.

The present invention can be implemented by variously changing the form of the engaging groove of the stopper member. For example, a locking groove may be formed in the shaft portion of the stopper member only in a part of the circumferential direction thereof.

In the second embodiment shown in FIGS. 6 and 7, the engagement groove 10 is formed by a part of the shaft portion circumferential direction by the eccentric circle. At this time, the shape of the locking groove in the direction of the axis A of the shaft portion may be a triangular shape shown by a two-dot chain line, instead of the arc shape as shown by the solid line in FIG.

Further, the form of the engaging groove 11 in the direction of the axis A of the shaft portion may be a cylindrical surface extending in the direction of the axis A as in the third embodiment shown in FIGS. 8 and 9.

Next, in the fourth embodiment shown in FIGS. 10 and 11, the engaging groove 12 is formed with a bottom surface having a flat cross section, and its processing is easy. In this embodiment, the locking groove 12 has a chordal bottom surface in a cross section (FIG. 11) perpendicular to the shaft portion 4, and a triangular groove in the front view (FIG. 10). There is. Therefore, in this case, the stopper member needs to be elastically pressed to the right in FIG. 10 by a spring or the like so that it is always in contact with the outer peripheral surface of the slide shaft body 1.

It should be noted that the present invention can be carried out even if the slide shaft body is not limited to a columnar shape, and may be a prismatic shape.

[0029]

As described above, according to the present invention, the slide shaft is merely processed by contacting the stopper shaft with the stopper member engaging groove which is gradually shallowed in the circumferential direction, without performing any processing on the slide shaft. Since the movement can be easily blocked, it is not necessary to process the slide shaft body with high hardness, and the manufacturing cost can be reduced, and even if the slide shaft body tries to move to some extent, it is surely blocked and the reliability of the device is improved. The safety is improved and the slide shaft is disassembled because it does not damage it.
The effect that the reassembly is smoothly performed is obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway exploded perspective view of a first embodiment device.

FIG. 2 is a cross-sectional view taken along a plane perpendicular to the axis of the slide shaft of the apparatus shown in FIG.

FIG. 3 is a cross-sectional view taken along a plane including the axis of the slide shaft of the apparatus shown in FIG.

FIG. 4 is an enlarged front view showing a locking groove portion of a stopper member of the apparatus shown in FIG.

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

FIG. 6 is a front view showing a locking groove portion of a stopper member of a second embodiment.

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

FIG. 8 is a front view showing a locking groove portion of a stopper member of a third embodiment.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is a front view showing a locking groove portion of a stopper member of a fourth embodiment.

11 is a sectional view taken along line XI-XI in FIG.

[Explanation of symbols]

 1 Slide Shaft 2 Bearing Member 2A Bearing Hole 3 Holding Hole 4 Stopper Member 5 Shaft 9 Locking Groove 10 Locking Groove 11 Locking Groove 12 Locking Groove

Claims (1)

[Claims] 1. A slide shaft body, and a bearing member for guiding and supporting the slide shaft body such that the slide shaft body is axially movable along a bearing hole surface.
A stopper member having a shaft portion that is held by a holding hole formed in the bearing member and that prevents the slide shaft body from moving in the axial direction by coming into contact with the peripheral surface of the slide shaft body. In the above, the stopper member is
The axis of the shaft is located in a plane intersecting the axis of the slide shaft and in contact with or in the vicinity of the peripheral surface of the slide shaft, and the shaft is movable in the axial direction thereof.
A locking groove is formed in a part of the peripheral surface of the shaft portion to receive the peripheral surface of the slide shaft body in contact therewith, and the depth of the locking groove gradually increases toward at least one of the circumferential direction of the shaft portion. A stopper device for a slide shaft that is shallow.