JPS6348806Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pivot mechanism that holds a movable member tiltably relative to a fixed member.

In this type of pivot mechanism, the movable member is tiltably mounted by pressing and holding the bulge of the movable member on a hemispherical concave seat formed on the fixed member using a spring. For example, a pivot mechanism used in an electric remote control mirror for an automobile as shown in FIG. A hemispherical bulge e provided on the back surface of the mirror body d, which is a movable member, is brought into contact with the catch c, and the coil spring f is pressed against the bulge e.
The mirror body d, which is a movable member, is attached to the fixed member b by screwing the screw g into the hemispherical concave seat c of the fixed member b.
It is installed so that it can be tilted. However, in such a conventional structure, the depth of the catch c and the height of the bulge e are fixed, and the coil spring f is disposed in the bulge e. Since the coil spring is tightened with screw g, in order to obtain the desired pressure contact force, it is necessary to make the gap between mirror body d and mirror h sufficiently large, and for this reason, the thickness of the pivot mechanism is Furthermore, it is difficult to construct a thin electric remote control mirror. Further, since the holding torque of the mirror body d, which is a movable member, is set depending on the degree of engagement of the screw g, there is a problem that it is not easy to keep the torque constant and it takes time and effort. Furthermore, since the mirror body d rotates around the center axis of the pivot mechanism relative to the fixed member b, not only the position of the mirror is displaced, but also a load is applied around the axis to the drive shaft that changes the angle of the mirror h. There are problems such as deforming the shaft.

In view of the above circumstances, the present invention provides a pivot mechanism in which the pivot mechanism is extremely thin, the torque setting of the pivot mechanism can be easily kept constant, and the movable member does not rotate around the central axis of the pivot. The purpose is to provide.

In order to achieve the above-mentioned object, the present invention has a hemispherical bulge of a movable member that is held in contact with a hemispherical concave seat of a fixed member via a spring, so that the movable member can bulge against the seat. In the pivot mechanism which can be tilted about the center position of the protruding part, an annular recess and a support protrusion at the center of the annular recess are formed at the bottom of the seat, and the bulge has a top part. A notch that is open and has a substantially uniform wall thickness and that reaches the movable member is formed in the bulge, and a holding member that is separate from the seat and the bulge is formed;
The holding member includes a protrusion that fits into the annular recess of the seat, and a hemispherical part that is continuous with the protrusion and abuts against the inner surface of the bulge, and the protrusion A spring locking portion is formed inside the tip of the spring, a guide arm that can engage with a notch in the bulging portion is formed in the hemispherical portion, and a bulging portion of the movable member is formed in the seat of the fixed member. the hemispherical shape of the holding member in a state in which the protrusion of the holding member is fitted into the annular recess of the seat and the guide arm of the holding member is engaged with the notch of the bulge. A coil spring is disposed in the holding member, and the coil spring is fixed to a support protrusion protruding from the bottom of the seat. A coil spring is arranged in the holding member in the bulge, which is compressed between the locking part at the tip of the protrusion and presses the seat of the fixed member and the bulge of the movable member. shall be.

Hereinafter, an example of the implementation of the pivot mechanism according to the present invention will be described with reference to FIGS. 2 to 7. In this embodiment, the pivot mechanism of the present invention is applied to a rearview mirror of an automobile.

As shown in these figures, a semi-spherical bulge 5 is formed on the rear surface of a mirror body 3 of a fixing member 2 formed on a housing 1, and the bulge 5 is fitted to the receiving seat 4.
The retaining member 6 is held in abutment against the support member 6.

Specifically, as shown in FIG. 4, the seat 4 has a support protrusion 41 formed upright from the center of the bottom thereof, and an annular recess 42 formed around the support protrusion 41. . The bulging portion 5 has an opening 51 at its top and is formed to have a substantially uniform thickness. The holding member 6 includes a hemispherical portion 61 that abuts against the inner surface of the bulged portion 5, and the annular recessed portion 4.
It is formed into a cylindrical shape and includes a protrusion 62 that fits into the cylindrical part 2. This holding member 6 is provided with a coil spring locking part 63 inside the tip of its protruding part 62, and the protruding part 62 of this holding member 6 is fitted into the annular recess 42 of the seat 4 through the bulged part 5. The coil spring 9 is inserted into the holding member 6, and the coil spring is compressed between the locking portion 63 and the retaining plate 7, and the retaining plate 7 is attached to the support protruding from the seat. It is fixed onto the protrusion 41 with a screw 8, so that the holding member 6 holds the bulge 5 against the seat 4 by the elastic force of the coil spring 9.

Further, a notch 52 is formed in the bulging portion 5 along the central axis, and a guide arm 64 that fits and is locked in the notch 52 is provided to protrude from the hemispherical portion 61 of the holding member. The guide arm 64 is formed in a cylindrical shape, for example, so as to protrude on a straight line in which the center axis of the hemispherical portion 61 and the pivot center position A are perpendicular to each other. Further, as shown in FIGS. 4 and 6, the notches 52 are formed so as to face each other from the front end of the bulge 5 so as to leave the rear end, and the bulge 5 is the largest. A notch 5 is provided in the mirror body 3 to prevent the guide arm 64 from interfering with the mirror body 3 when tilting.
A notch 3a continuous with 2 is formed.

As shown in FIGS. 2 and 3, the notch 52 and the guide arm 64 are configured such that the guide arm 64 is fitted into the notch 52 and the bulging portion 5 is prevented from rotating relative to the seat 4. .

As shown in FIG. 5, a slit 65 is provided in the protrusion 62 of the holding member 6, and the slit 65 allows the protrusion 62 to be attached to the annular recess 42 of the seat 4.
This allows for easy mating.

Further, as shown in FIGS. 2 and 3, each of the two advancing/retracting rods 1a assembled to the housing 1 is connected to the mirror body 3 via the respective joints 11, so that each advancing/retracting rod 1a moves forward and backward. By doing so, power is transmitted to the mirror body 3, whereby the mirror body 3 and the mirror 10 attached thereto are moved back and forth and left and right about the pivot center position A.

The pivot mechanism of the present invention has the above-mentioned structure, and can be assembled as follows. That is, first, the support protrusion 41 of the seat 4 of the fixing member 2 is inserted into the opening 51 of the bulge 5 of the mirror body 3, so that the bulge 5 is fitted into the seat 4 and abuts against it.

Next, the protrusion 62 of the holding member 6 is fitted into the annular recess 42 of the seat 4 via the bulge 5, and
The hemispherical portion 61 is brought into contact with the inner surface of the bulged portion 5. At this time, the guide arm 64 of the holding member 6 is engaged with the notch 52 of the bulge 5. Thereafter, a coil spring 9 is disposed in the holding member 6 inserted through the support protrusion 41, and the retaining plate 7 is inserted into the support protrusion 41.
The coil spring 9 is compressed by pressing it against the top of the support protrusion 41 and screwing the screw 8 onto the support protrusion 41. That is, the elastic restoring force of the coil spring 9 presses the holding member 6 to the fixing member 2 via the bulge 5 of the mirror body 3.

In this way, in the present invention, the support protrusion 41 and the annular recess 42 are formed on the seat 4, and the seat 4
At the same time, the holding member 6 is fitted into the bulging part 5 that is fitted into the bulging part 5, and the protruding part 62 of the holding member is fitted into the annular recess 42 of the seat, and the spring at the tip of the protruding part is fitted. A coil spring 9 is installed between the locking portion 43 of the
Since the coil spring is compressed, it is possible to arrange a coil spring having any desired length regardless of the depth of the catch seat 4 and the bulging part 5. There is no need to increase the gap between the pivot mechanism and the pivot mechanism, and the pivot mechanism can be made thinner.

Further, since the spring force of the coil spring 9 is determined simply by fixing the retaining plate 7 to the support protrusion 41, the holding torque of the mirror body 3 relative to the fixing member 2 can be easily and reliably set to a constant value. Moreover, since it is only assembled sequentially,
Assembly can be done easily. Further, since the mirror body 3 is prevented from rotating with respect to the pivot center position A by the guide arm 64 of the holding member and the notch 52 of the bulge, the mirror 10 is always held at a constant position when the mirror 10 is tilted. can do.

As described above, according to the present invention, the structure can be made thin, the set torque of the movable member relative to the fixed member can be easily and reliably kept constant, and the assembly can be easily performed. There is an advantage that it can be done.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of an electric remote control mirror to which a conventional pivot mechanism is applied, and Fig. 2 is a partially cutaway view showing an embodiment in which the pivot mechanism of the present invention is applied to an electric remote control mirror. 3 is a side sectional view, FIG. 4 is an exploded view of the pivot mechanism, and FIG. 5 is a side view corresponding to the arrow direction in FIG. 4 showing the holding member.
6 is a cross-sectional view of the mirror body corresponding to the line - in FIG. 4, and FIG. 7 is a view of the mirror body taken along the arrow in FIG. 6. 2...Fixing member, 3...Mirror body, 4...
Seat, 41... Support protrusion, 42... Annular recess, 5
...Bulging portion, 52... Notch, 6... Holding member, 6
DESCRIPTION OF SYMBOLS 1... Hemispherical part, 62... Projection part, 63... Spring locking part, 64... Guide arm, 7... Retention plate, 8... Screw, 9... Coil spring.

Claims (1)

[Scope of utility model registration request] The hemispherical bulge of the movable member is held in contact with the hemispherical concave seat of the fixed member via a spring, so that the movable member can tilt about the center position of the seat and the bulge. In the pivot mechanism,
An annular recess and a support protrusion at the center of the annular recess are formed at the bottom of the seat, and the bulge has a substantially uniform wall thickness with its top open. A notch is formed that reaches the movable member, and a holding member is formed that is separate from the seat and the bulge, and the holding member includes a protrusion that is fitted into the annular recess of the seat. , a hemispherical part continuous to the protruding part and abutting against the inner surface of the bulged part, a spring locking part being formed inside the tip of the protruding part, and a hemispherical part being connected to the hemispherical part. forming a guide arm capable of engaging with a notch in the bulging portion, and causing the bulging portion of the movable member to fit into and abut against the seat of the fixed member;
The protrusion of the holding member is fitted into the annular recess of the seat, and the hemispherical part of the holding member is fitted into the bulge with the guide arm of the holding member engaged with the notch of the bulge. Further, a coil spring is disposed in the holding member, and the coil spring is connected to a retaining plate fixed to a support protrusion protruding from the bottom of the seat and a locking portion at the tip of the protrusion of the holding member. 1. A pivot mechanism characterized in that a coil spring is arranged in a holding member in the bulge, and is compressed between the two and presses the seat of the fixed member and the bulge of the movable member.