JPS60209341A - Foldable rear-view mirror device - Google Patents

Abstract

PURPOSE:To reduce extension of a tension spring and make a visor compact in a foldable rear-view mirror device adapted to be inclined about front and rear fulcrums against the tension spring, by moving the fulcrums in combination of guide rails with rollers. CONSTITUTION:A drive section 8 is mounted to an end of a bracket 11 of a visor (not shown) fully covering a mirror 2, and a mirror holder 2a is tiltably supported by a ball bearing portion 8a of the drive section 8. Upper and lower small rollers 12 are provided at front and rear end portions on the stay 3 side of the bracket 11. The rollers 12 are rolled on guide rails 13 formed on the stay 3 in such a manner as to be biased thereagainst by means of a tension spring 7. The guide rails 13 are arcuately formed, and are so inclined as to project at a portion near the spring 7. When the visor is largely inclined about front and rear moving fulcrums F and R, the rollers 12 may be moved along the guide rails 13 to a position across a line connecting mounting points at both ends of the spring 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a foldable structure for a visor in a foldable rear mirror device for a vehicle.

Rear mirror devices such as 7-end mirrors and door mirrors of conventionally modified automobiles must have a folding function in order to prevent accidents when they come into contact with obstacles. In particular, in the case of door mirrors, the amount of protrusion toward the outside surface of the vehicle is small, and it is desirable that the mirrors be kept in a collapsed state in order to reduce the overall width of the vehicle during transportation or when parking in a garage.

To meet these requirements, for example, a front hinge that allows the visor to be tilted forward and a hinge that allows the visor to be tilted backwards is placed between a visor with a mirror inside and a stay that serves as a pedestal for attaching the visor. There is a so-called double-hinge type having a rear hinge, and FIG. 8 shows its schematic structure.

In the figure, 1 is a visor with a mirror 2 inside, 3 is a stay, 4 is a vehicle body, 5 is a front hinge, and 6 is a rear hinge. When tilting the visor 1 forward (to the right in the figure), use the front hinge. 5 serves as a fulcrum to lift the rear hinge 6, and when tilting backward, the rear hinge 6 serves as a fulcrum to lift the front hinge 5.
is lifted up.

Note that in this specification, "front and rear" refers to the forward direction and backward direction of the vehicle when it is attached to the vehicle. In this structure, the tension spring 7 is required to hold the visor 1 in the operating state shown by the solid line in the figure, and is tensioned between the visor side attachment part 7a and the stay side attachment part 7b.
As is well known, a drive section 8 for supporting the mirror 2 and adjusting its posture is provided in the visor 1, so a tension spring 7 is installed so as not to interfere with the drive section 8.
Therefore, a problem arises in that the visor 1 becomes large in size. Furthermore, in order to hold the visor 1 in the tilted position, it is necessary to avoid interference between the hinges 5 and 6 and the tension spring 7. For example, the hanger arm 9 is curved in a C shape to prevent it from coming into contact with the hinge. However, with this, the front can only be tilted and held in one direction, the rear.

In addition, as for other structures, the installation is done by protruding the base from the bottom of the stay to the side, and this installation is a single-axis type in which the visor is rotatably supported by providing a support shaft almost perpendicular to the base. There are some, but because of the mounting base, the whole thing becomes a doll,
Another problem is that it is difficult to provide a function to automatically return to the operating state from the tilted and held state.

Structure of the Invention The present invention has been made in view of the above-mentioned problems, and has been made for the purpose of providing a foldable rear mirror device that is small and equipped with a folding mechanism that can be easily tilted and held. Similarly, in a device equipped with a front fulcrum, a rear fulcrum, and a tension spring, at least one of each fulcrum is a movable fulcrum that is movable in the front and rear direction and consists of a combination of a guide rail provided on the stay and a roller attached to the visor, When the visor is tilted beyond a certain limit to the movement fulcrum side, the roller moves along the guide rail to a position where it crosses the line connecting the stay side attachment part of the tension spring and the visor side attachment part, and the tension spring Feature 3- is that the biasing force is reversed in the direction of tilting the visor.

Example Hereinafter, the present invention will be specifically explained with reference to illustrated embodiments.

FIG. 1 is a partially exploded perspective view of the main parts of the first embodiment,
Reference numeral 11 denotes a visor bracket, and a drive section 8 is attached to the tip of the bracket 11. A mirror holder 2a to which the mirror 2 is attached is tiltably supported by a ball bearing section 8a of this drive section 8. Reference numeral 12 designates four small rollers attached to the top and bottom of the front and rear ends of the bracket 11 on the stay side, respectively. Reference numeral 13 designates a guide rail formed on the stay 3 corresponding to the rollers 12, which connects the bracket 11 and the stay. 3
Each roller 12 is pressed against the corresponding idle rail 13 by the biasing force of the tension bone 7 stretched between them, and the front fulcrum F and the rear fulcrum R are movable in the front-back direction by the rollers 12 and the guide rail 13. is configured. As shown in FIG. 2, the guide rail 13 is recessed in an arcuate shape, and is inclined so that the portion near the tension spring 7 is higher.

Next, the operation will be explained with reference to FIGS. 2 to 4.

Note that the front roller is the front roller 12F, and the rear roller is the rear roller.
7'1.2R, the front side is the idle rail 13F,
The rear side is the rear rail 13R.

FIG. 2 shows the state of use in which the visor is in an upright position, and the front roller 12F is at the front end T of the front rail 13F. To,
The rear roller 12R is the rear end S of the rear rail 13R. , respectively, and the tension springs 7 are upright. In the figure, Qo is the position of the visor-side attachment part 7a of the tension spring 7 in use, P is the position of the stay-side attachment part 7b, and R1 is the rear rail 1.
3R, R2 is the radius of the front rail 13F, Ql is the center of the arc of the rear rail 13R, and Q and I are the centers of the arc of the front rail 13F.

<Tilting backward> First, the operation when tilting backward will be explained with reference to FIG. When an external force is applied to the visor and it is pushed backward, the visor tilts around the rear roller 12R located at the So position, and the front roller 12
F leaves the front rail 13F. This state continues until the visor side attachment part 7a comes to the position Ql, and the front roller 12F
comes to the position T2 (Fig. 3(a)). At this time, when the external force applied to the visor is removed, the visor automatically moves to the use position due to the force of the tension spring 7.

When the visor is further tilted from the state shown in FIG.
It moves in the force direction and finally reaches S11, and the front roller 12F reaches T3 from T2 (Fig. 3(b)).
. During this time, the visor side attachment part 7a hardly moves from Q, and the position of Sl is set on the line connecting Q and P, so the visor cannot be automatically returned until the rear roller 12R reaches Sl. be.

If you tilt the visor further from the state shown in Figure 3 (1)),
The visor side attachment part 7a moves further backward from Ql in a circular motion centered on SI, and a line connecting the visor side attachment part 7a and the stay side attachment part 71 at position P is the rear roller 12.
Move to the rear side of the R position S1. Therefore, the force of the tension spring 7 is reversed in the direction of tilting the visor further backwards with the rotation center being S1, and the visor falls to a position where it hits a stopper (not shown) and is self-held in that state (
Figure 3 (C)). Q2 is the visor side mounting part '7a at this time.
, and T4 is the position of the front roller 12F.

In order to return to the operating state from the tilted state shown in FIG. 3(c), the visor can be raised forward, and the operations of each part are the opposite of those described above.

Tilt forward> Next, the operation when tilting forward will be explained with reference to FIG. First, when the visor is pushed forward, the visor tilts around the front roller 12F located at T, and the rear roller 12R separates from the rear rail 13R. In this state, the visor side mounting part 7a is
, l continues until the rear roller 12R (, tS2
(Fig. 4(a)).

When the visor is further tilted from the state shown in FIG. 4(a), the front roller 12F performs a circular arc movement centered on Q and l,
Along the front rail 13F, the rear end T1 of the front rail 137-F is reached, and the rear roller 12R reaches the rear end T1 of the front rail 137-F.
to reach S3 (Fig. 4(b)).

The operation up to this point is basically the same as the case of rearward tilting described above, but in this embodiment, the radius R2 of the front rail 13F is larger than the radius R5 of the rear rail 13R, and the rear rail 13R is Since it is provided at a deeper position than 13R, the position of T1 is Q. It is located in front of the line connecting ゛ and P. Therefore, the force of the tension spring 7 acts in the direction of returning the visor, and the inverted position in which the visor is switched to the direction of tilting the visor further tilts the visor from the state shown in FIG. The position of 7a is shown in Figure 4(c).
The position reaches Q21, which is on the line connecting P and T shown in .

That is, after passing the position shown in FIG. 4(c), the visor is tilted to a stopper position (not shown) by the action of the tension spring 7, and the visor side mounting portion 7a is moved from Q21 to Q31, and the rear roller 12R is moved from S to Q31. to S5 in a circular motion centered on T, and is self-maintained in that state (fourth
Figure (d)).

8- When returning to the operating state from the tilted holding state shown in FIG. 4(d), it is sufficient to raise the visor toward the rear, and the operation of each part is the opposite of that of the double series.

As mentioned above, the range in which the return force acts on the visor in the direction of the usage state is wider when it is tilted forward, and the range in which the holding force in the tilting direction is applied is wider when it is tilted backward. It is wider, and the elongation of the tension bone 7 that occurs when tilting is approximately the same both when tilting forward and backward. This can be changed depending on the position, inclination, and shape of the guide rail 13, and these elements may be appropriately set according to requirements. In the embodiment, the rail shape is an arcuate concave shape, but it does not necessarily have to be an arcuate shape.

Next, a second embodiment shown in FIGS. 5 and 6 will be described. This embodiment is designed to be self-supported only when tilting backward, and the rear fulcrum R is connected to the roller 12.
A moving fulcrum is made of an idle rail 13, and a front fulcrum F is constructed by combining a branch 14 protruding from a bracket 111 and a receiving part 16 having an inclined step part 15 provided on the stay 3. Therefore, when the visor 1 is tilted significantly backward, the roller 12 moves to the front end S1 close to the position P of the stay-side attachment portion 7b of the tension spring 7, and the visor-side attachment portion 7a passes the reversal position Q1. and is held in a tilted position.

FIG. 7 shows yet another embodiment, in which each of the front and rear fulcrums F and R
one gear roller 12a and one gear rail 13a, respectively.
Two tension pins 7 are arranged on both sides of the upper and lower sides of the bracket 11.

Effects of the InventionAs is clear from the description of each embodiment above, the present invention has the following effects:
At least one of the front side and the rear side is used as a moving fulcrum consisting of a combination of a guide rail and a roller, and when the visor is tilted greatly, it crosses the line connecting the stay side attachment part of the roller bow 1 tension spring and the visor side attachment part. position, and the biasing force of the tension spring is reversed in the direction of tilting the mirror, so it is easy to hold the visor in the tilted state, and the held state is ensured.
In addition, the movement of the fulcrum allows the spring to stretch less, so the overall length of the spring is shortened, making it possible to downsize the visor, resulting in a compact, foldable rear mirror device that can be reliably held in a tilted state. be able to.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded perspective view of essential parts of an embodiment of the present invention, FIGS. 2 to 4 are explanatory diagrams of the operation of the embodiment, and FIGS.
The figures are a schematic structural diagram and a partially exploded perspective view of the main parts of another embodiment, FIG. 7 is a perspective view of the main parts of another embodiment, and FIG. 8 is a schematic structural diagram of an example of the conventional example. 1... Visor, 2... Mirror, 3... Stay, 7
...Bow 1 tension spring, 7a...Visor side mounting part, 7b.
...Stay side attachment part, 12...Roller, 13...Guide rail, F...Front side fulcrum, R...Rear side fulcrum. Patent applicant Tokai Rika Denki Seisakusho Co., Ltd. Patent attorney Aoyama Ao and two others 12- Figure 3 (0) 01 Figure 3 (b)

Claims (1)

[Claims] (1) The visor that is installed inside the Mira, a stay that serves as a pedestal for attaching this visor, a front fulcrum that is provided between the visor and the stay that allows the visor to tilt forward, and a support that allows the visor to tilt backward. and a tension spring located between the two fulcrums and tensioned between the visor and the stay. A movable fulcrum consisting of a combination of a guide rail provided on the stay and a roller attached to the visor is movable in the front and back direction, and when the visor is tilted to the movable fulcrum side, if the tilt angle exceeds a certain limit, the roller The tension spring is moved along the guide rail to a position crossing a line connecting the stay-side attachment part and the visor-side attachment part, and the biasing force of the tension spring is reversed in the direction of tilting the visor. Folding rear mirror device.