JPS60179349A - Device for tilting movement - Google Patents

Abstract

PURPOSE:To give firm support of a push rod to a body by engaging screw grooves of the push rod with multiple elastic engaging pawls formed on an engagement unit that is fixed on the body. CONSTITUTION:When a motor 38 rotates, a rotor 15 is rotated permitting rational movement of both a guide stem 20 formed in a body with the rotor 15 and a push rod 23 which is engaged with a guide hole 26. Rotational movement of the push rod 23 moves the push rod 23 itself forward or afterward depending on the direction of its rotation, since screw grooves 24 of the push rod are engaged with elastic engaging pawls 20 of an engagement unit 27. Accordingly, a mirror supporting plate 4 is displaced forward or afterward at a point of connection to the push rod 23 resulting in tilting movement of the mirror supporting plate 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a novel tilting device. Specifically, it includes a bushing rod that is supported so as to be movable in and out of the body, a tilting member that is universally connected to the tip of the bushing rod and supported so as to be tiltable relative to the body, and the bushing rod is supported so as to be movable in and out of the body. It is an object of the present invention to provide a novel tilting device in which a tilting member is tilted by tilting the tilting member, and which operates smoothly and stably supports the tilting member.

Background technology and its problems FIG. 1 shows an example of a conventional tilting device.

In the figure, a denotes a body, which is formed into a case shape by a rear half B and a front half C. Reference numeral d designates a tilting member, which is connected to the front half C of the body a with a pole joint at its substantially central portion, so that it can freely tilt with respect to the body a.

Reference numeral e denotes a rotating body, and a worm wheel g is integrally formed in the middle of a cylindrical part f whose front end is open and whose rear end is closed. The cylindrical portion f has a rectangular guide hole opened at the front end.

i is an elliptical support hole formed in the front part C of the body a, and a part of the cylindrical part f of the rotating body e in front of the worm wheel g is rotatably inserted into the support hole i. It is fitted. The rear end surface of the cylindrical portion f is supported by a protrusion j protruding from the rear half b, and by these protrusions the rotating body e is rotatably supported by the bodies a. A worm k is fixed to the output shaft of a motor (not shown) supported in the body a, and meshed with the worm wheel g of the rotating body e. Therefore, when the motor rotates, the rotating body e is rotated.

t is a bushing rod having a threaded groove m formed on its outer peripheral surface, a rectangular flange n formed at its rear end, and a sphere 0 formed at its front end. The bushing rod t has a flange n that is connected to the rotating body e.
The spherical body 0 at the tip is fitted into a spherical recess p formed on the back surface of the tilting member d.

q is a torsion coil spring which is supported by the wall constituting the support hole i of the front flap C and is engaged with the thread groove m of the bushing rod t.

In the above-mentioned tilting device, when the rotating body e rotates, the bushing rod L whose square flange n is fitted into the square guide hole of the rotating body e is also rotated together with the rotating body e. Since the torsion coil spring q is engaged with the threaded groove m of the bushing rod t, this functions like a nut, and therefore the bushing rod t projects in the direction from the body a depending on the direction of its rotation. Alternatively, it will be moved in the direction of retraction toward body a.

As the bushing rod t moves in its axial direction in this manner, the position of the portion of the tilting member d that is connected to the tip of the bushing rod t with respect to the body a moves, so that the tilting member d is tilted about a point supported by body a in a ball-and-socket joint.

Note that r is a rubber cover, and a frame is provided between the outer peripheral surface of body a and the tilting member d.
This is to cover the gap created between the body a and prevent moisture and dust from entering the body a. If such a rubber force /<-r is not provided, moisture and dust will enter the body a through the support hole i formed in the front nozzle C4 of the body a.

In the above-mentioned tilting device, a torsion coil spring q is used as a means for engaging with a threaded groove m of the bushing rod 1 to rotate the bushing rod t and move it in the axial direction.
, there is a problem that the force for holding the bushing rod t is not stable. That is, as shown in FIG. 1(C), there is a misalignment between the extending direction of the engaging portion of the torsion coil spring q and the extending direction of the thread groove m of the bushing rod t, so that the thread groove m of the bushing rod t and the thread There is a problem in that the engagement with the coil spring q is not perfect, and as a result, the bushing rod t is not held sufficiently in the body a. Furthermore, it is difficult to hold the torsion coil spring q in the body a so that so-called "backlash" does not occur, and this, together with the aforementioned problem, causes the problem that the support of the tilting member d is unstable. Therefore, when such a tilting device is used as a tilting device for a car rearview mirror, for example, the tilting member d that supports the mirror will vibrate due to vibrations caused by the driving of the car.
A so-called "mirror surface chatter" phenomenon occurs.

OBJECT OF THE INVENTION The present invention has been made in view of the above-mentioned problems with the conventional tilting device. A tilting device is provided with a tilting member universally connected to the body and supported so as to be tiltable with respect to the body, and the tilting member is tilted by moving a bushing rod into and out of the body, and the tilting device has a smooth operation. In addition, it is an object of the present invention to provide a novel tilting device in which support of a tilting member is stable.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the tilting device of the present invention includes a bushing rod that is supported so as to be movable in and out of the body, and that is universally connected to the tip of the bushing rod and is tiltable with respect to the body. A tilting device having a supported tilting member, comprising a rotating body rotatably supported within a body and rotated by a suitable drive source, the bushing rod being rotated together with the rotating body, and the bushing rod being rotated by the rotating body. The bushing rod is supported on a rotating body so as to be movable in the axial direction, a thread groove is formed on the outer peripheral surface of the bushing rod, and a plurality of elastic engagement pawls are formed on a synthetic resin engagement body fixed to the body. The bushing rod is characterized in that it engages with a threaded groove formed in the bushing rod.

According to the present invention, a plurality of elastic engaging pawls formed on a synthetic resin engaging body fixed to the body are engaged with the thread groove of the bush loft, so these elastic engaging pawls are engaged with the thread groove of the bush loft. It is possible to completely engage the thread groove, and unlike the support of a torsion coil spring,
It is possible to securely fix the engaging body to the body, and as a result, the support of the bushing rod to the body is extremely reliable, and therefore, the holding of the tilting member is also stable.

EMBODIMENTS The details of the tilting device of the present invention will be explained below according to illustrated embodiments.

In the illustrated embodiment, the tilting device of the present invention is applied as a tilting device for a rearview mirror for an automobile.

1 is a body, which is formed into a case shape by combining a rear half 2 made of synthetic resin and a front half 3 made of synthetic resin as well.

4 is a mirror support plate, which is made of synthetic resin;
A mirror 5 is supported on the front side of this mirror support plate. A protrusion 6 protruding rearward is formed approximately at the center of the mirror support plate 4, and the rear end surface of the protrusion 6 is spherical. Further, a cross-shaped guide slit 7 is formed in the center of the protrusion 6. Reference numeral 8 denotes a pedestal portion formed to protrude forward on the front surface of the front half 3, and a concave spherical support surface 9 is formed in the center of the core pedestal portion 8.

The curvature of this support surface 9 and the curvature of the rear end surface of the protrusion 6 formed on the mirror support plate 4 are made substantially the same. Further, a boss-like projection IO is provided to protrude forward from the center of the support surface 9.

Thus, the rear end surface of the protrusion 6 formed on the mirror support plate 4 is brought into contact with the support surface 9 formed on the body 1.

At this time, the boss-like protrusion lO protruding from the center of the support surface 9 is inserted into the guide slit 7 formed in the protrusion 6,
The protrusion 6 is made to protrude inward. Reference numeral 11 denotes a spherical washer, which is fitted onto the boss-shaped projection 10 projected into the projection 6 and brought into contact with the inner surface of the rear end of the projection 6. Reference numeral 12 denotes a coil spring, which is externally fitted onto a portion of the boss-shaped projection 1O that projects into the projection 6. A washer 13 is fixed to the tip of the boss-like projection 10 with a screw 14, and the coil spring 12 is compressed between the washer 13 and the spherical washer 11. In this way, the mirror support plate 4 is tiltably supported by the body 1. That is, when the mirror support plate 4 tilts with respect to the body 1, the rear end surface of the protrusion 6 formed on the mirror support plate 4 slides against the support surface 9 formed on the body l, and A boss-shaped protrusion 10 protruding from the center of the support surface 9 moves along a guide slit 7 formed in the protrusion 6.

15 is a rotating body made of synthetic resin. The rotating body 15 has a short cylindrical shape, and includes a cylindrical part 16 with a closed rear end and an open front end, and a worm wheel 17 formed to protrude outward from the front end of the cylindrical part 16. are formed integrally. Further, an annular protrusion 18 is formed protruding from the front surface of the worm wheel 17 at a position near the periphery thereof. Furthermore, the rear end wall 1 of the cylindrical portion 16 of the rotating body 15
A guide rod 20 is formed that projects forward from the center of the guide rod 9, and the guide rod 20 has a rectangular cross-sectional shape.

Reference numeral 21 denotes a circular support tube formed by forming an annular wall on the inner surface of the rear half 2 of the body 1, and the cylindrical portion 16 of the rotating body 15 is rotatably placed inside the support tube 21. At the same time, the tip of the support cylinder 21 is brought into contact with the rear surface of the worm wheel 17 . Reference numeral 22 denotes a circular support tube projecting from the inner surface of the front half 3, and the rear end of the support tube 22 comes into contact with the tip end surface of the annular protrusion 18 formed on the worm wheel 17. In this way, the rotating body 15 is rotatably supported by the body l.

23 is a bushing rod with a threaded groove 2 on its outer circumferential surface.
4 is formed, and a sphere 25 is integrally formed at the front end. Further, a guide hole 26 is formed in the center of the bushing rod 23 and is open at the rear end. The cross-sectional shape of the guide hole 26 is square and the same as the cross-sectional shape of the guide rod 20, and the guide rod 20 is inserted into the guide hole 26.
is fitted in a slidable manner.

Reference numeral 27 denotes an engaging body, which is made of a slightly elastic synthetic resin. The engaging body 27 has a cylindrical cylindrical portion 2.
8 and a plurality of elastic engagement claws 29, 29, 29 integrally formed on the cylindrical portion 28. Elastic engagement claw 29.29.
29 is provided so as to be folded back from the inside to the front from the rear end edge of the cylindrical portion 28.
8, the slits 30.30. @-・ is formed. Furthermore, claw bodies 31, 31, 31 that protrude inward are formed at the tips of the elastic engagement claws 29, 29, 29. The positions of these claw bodies 31, 31, 31 in the front-rear direction are shifted so that they are arranged along the thread groove z4 formed in the bushing rod 23. However,
The cylindrical portion 28 of the engaging body 27 as described above is press-fitted into the support cylinder 22 formed on the front half 3, thereby forming elastic engaging claws 29, 29, 29 on the body l. Become so. And these elastic engagement claws 29.29
．． A claw body 31.31.31 formed at the tip of the bushing rod 29 is engaged with a threaded groove 24 formed on the outer peripheral surface of the bushing rod 23.

Reference numeral 32 denotes a receiving portion protrudingly formed on the rear surface of the mirror support plate 4. A spherical recess 33 is formed approximately at the center of the receiving portion 32, and the spherical body 25 of the bushing rod 23 is fitted into the spherical recess 33. and thereby the bushing rod 23
The tip of the mirror support plate 4 is connected to the rear surface of the mirror support plate 4. In addition, 34
．． 34, . . . are retaining pieces protruding so as to surround the spherical recess 33 of the receiving portion 32, and their tips are bent outward.

A rubber boot 35 is made of rubber and has a substantially cylindrical bellows shape. An annular flange 36 protruding inward is formed at the front end of the rubber boot 35, and the flange 36 is connected to the engaging pieces 34, 34, . . . formed on the receiving portion 32 of the mirror support plate 4. engaged. Further, an annular flange 37 is formed at the rear end of the rubber boot 35 and projects outward. and the front end of the cylindrical portion 28 of the engaging body 27.

By installing the rubber boot 35 between the front half 3 of the body 1 and the mirror support plate 4 in this manner, the portion where the bushing rod 23 is provided is made waterproof and dustproof.

Reference numeral 38 denotes a motor fixed to the body 1, and a worm 39 is fixed to its output shaft, and the worm 39 meshes with the worm wheel 17 of the rotating body 15.

When the motor 38 rotates, the rotating body 15, in which the worm wheel 17 is engaged with the worm 39 fixed to its output shaft, rotates. When the rotating body 15 rotates, the bushing rod 23, in which the guide rod 20 integrally formed on the rotating body 15 and the guide hole 26 are engaged, moves into the rotating body 15.
It is rotated along with the When the bushing rod 23 rotates, the thread groove 24 of the bushing rod 23 rotates into the engaging body 27.
The bushing rod 23 moves forward or backward depending on the direction of its rotation. Therefore, the portion of the mirror support plate 4 connected to the bushing rod 23 is displaced forward or backward, and the mirror support plate 4 is tilted about a rotation axis to be described later.

The illustrated tilting device is provided with two mechanisms consisting of a rotating body 15, a bushing rod 23, an engaging body 27, a rubber boot 35, a motor 38, and a worm 39, one of which is a mirror. Two lines intersect perpendicularly at the point where the protrusion 6 of the support plate 4 is supported by the body 1. One of the lines x--X intersects with the axis of the bushing rod 23, and the other intersects perpendicularly. The axes of the bushing rods 23 are arranged so as to intersect on the other line Y--Y. Therefore, the mirror support plate 4 is
It can be tilted using the shaft as a rotation axis. That is, x-X
If the mechanism arranged on the axis is driven, the mirror support plate 4 will tilt with the Y-Y axis as the rotation axis, and if the mechanism arranged on the Y-Y axis is driven, the mirror support plate 4 will be tilted. t#X
- Tilt with the X axis as the rotation axis.

In the above-mentioned tilting device, the elastic engagement claws 29, 29, 29, which are divided into a plurality of parts, engage with the thread groove 24 of the bushing rod 23, so that the engagement between the two is ensured. is held stably, and even when this tilting device is applied to a tilting device for a rearview mirror for an automobile, it is possible to prevent the mirror 5 from chattering due to vibrations caused by the running of the automobile.

Note that, as shown in the above embodiment, the engaging body 27 is press-fitted into the support tube 22 formed in the front half 4 to attach the body 1.
By attaching it to the rear surface of the mirror support plate 4, the rear end of the cylindrical rubber boot 35 can be supported at the same time when the engaging body 27 is attached. Waterproofing and dustproofing can be achieved by simply supporting the mirror support plate, and it is extremely inexpensive compared to the conventional method of covering the entire area between the outer periphery of the mirror support plate and the outer periphery of the body with a rubber cover. It is.

Variations FIG. 5 shows a modification of the tilting device of the present invention.

In this example, the rear end of the cylindrical portion 28 of the engaging body 27 is connected to the rotating body 1.
5, and this has the effect of stabilizing the position of the engaging body 27 within the support tube 22.

Effects of the Invention As is clear from the above description, the tilting device of the present invention includes a bushing rod that is supported to be able to move in and out of the body, is universally connected to the tip of the bushing loft, and is tiltable with respect to the body. The tilting device includes a tilting member supported by a body, and includes a rotating body rotatably supported within the body and rotated by an appropriate drive source, the bushing rod is rotated together with the rotating body, and the bushing rod is rotated by the rotating body. It is supported on a rotating body so that it can move in its axial direction.

Thread grooves are formed on the outer peripheral surface of the bushing rod, and a plurality of elastic engagement pawls formed on a synthetic resin engaging body fixed to the body engage with the thread grooves formed on the bushing rod. Features.

As described above, according to the present invention, a plurality of elastic engaging pawls formed on a synthetic resin engaging body fixed to the body engage with the threaded groove of the bushing rod. It is possible to completely engage the engagement body with the thread groove of the bushing rod, and furthermore, unlike the support of a torsion coil spring, it is possible to securely fix the engaging body to the body,
These things ensure that the bushing rod is supported on the body very reliably, and therefore that the tilting member is held stably.

[Brief explanation of the drawing]

Figure 881 shows an example of a conventional tilting device, (A)
is a sectional view of the main part, (B) is an exploded perspective view of the main part, (C) is an enlarged side view of the main part, and FIGS. 2 to 4 show an example of implementation of the tilting device of the present invention. Fig. 2 is a rear view with the rear half of the body removed, Fig. 3 is a sectional view taken along line m-m in Fig. 2, Fig. 4 is an enlarged exploded perspective view of the main parts, and Fig. 5 is the invention of the present invention. FIG. 7 is a sectional view of a main part showing a modification of the tilting device. Explanation of symbols 1... Body, 4... Tilting member, 15... Rotating body, 23... Bush rod, 24
ψ fist/screw groove, 27/Φ/engaging body, 29 fist...elastic engagement claw (, 4) (C) Fig. 1 (B)

Claims (1)

[Claims] A tilting device comprising a bushing rod that is supported so as to be movable in and out of the body, and a tilting member that is universally connected to the tip of the bushing rod and supported so as to be tiltable relative to the body, a rotating body that is freely supported and rotated by an appropriate driving source; the bushing rod is supported on the rotating body so that the bushing rod rotates together with the rotating body and the bushing rod is movable in the axial direction relative to the rotating body; A thread groove is formed on the outer peripheral surface of the bushing rod, and a plurality of elastic engagement pawls formed on a synthetic resin engagement body fixed to the body engage with the thread groove formed on the bushing rod. tilting device