JPH0247046Y2 - - Google Patents

Description

[Detailed Description of the Invention] 〓Field of Industrial Application〓 The present invention relates to an improved lifting device for a light shielding body for an automobile.

<Prior Art> As is well known, a light shielding body called a sun visor is installed on the front side of an automobile to block solar radiation from the driver and the like.

Usually, such a light shielding body is movably attached near a window inside a car in order to be able to adjust it to appropriately block sunlight and store it when it is not needed.

Particularly in large vehicles such as buses and trucks, the size of the light shields installed on them is large, so simple and robust means are used to raise and lower the light shields.One example of this is the device shown in Figure 2. provided.

The apparatus shown in FIG. 2 will be briefly described below.

In FIG. 2, a guide shaft 1 extending in the vertical direction is attached near an interior window of an automobile (not shown).

The light shielding body 2 consists of a light shielding plate 3, a support shaft 4 attached to the light shielding plate 3, and a guide 5 attached to the base end of the support shaft 4, and inside the guide 5 there are bearings 6a, A slip ring made of Teflon resin (trade name) is built in as 6b.

The light shielding body 2 has its guide device 5 penetrated by the guide shaft 1, and the guide shaft 1 and the bearings 6a, 6.
b are fitted into each other and assembled to the guide shaft 1 so as to be movable up and down.

Winding machine 7 for raising and lowering the light shielding body 2
The winder 9 includes a cable 8 that can be freely wound and unwound, and a motor 1 that serves as a drive source for the winder 9.
0 and a transmission system 11 for transmitting the rotation of the motor 10 to the winder 9, and the end of the cable 8 roped through a pulley 12 is connected to the guide device 5.

In the device shown in FIG. 2, the guide shaft 1 and the bearings 6a, 6b of the guide device 5 are relatively fitted, and in this configuration, the light shield 2 can be freely raised and lowered, so that the light shield 2 can be moved up and down freely. 2 lifting and lowering operations can be performed.

That is, the light shielding body 2 can be raised and lowered by transmitting the rotation of the motor 10 from the transmission system 11 to the winder 9 to wind up or unwind the cable 8.

Problems to be Solved by the Invention In the conventional device described above, even after the light shielding body 2 is lowered to the lower limit position via the winding mechanism 7,
When the motor 10 is rotated, the cable 8 is unwound from the winder 9 more than necessary.

Therefore, a limit switch for stopping the motor is generally provided at the lower limit position when the light shield 2 is lowered, and this avoids unnecessary unwinding of the cable 8. On the way,
If the light shield 2 cannot be lowered due to an unforeseen situation such as a foreign object entering between the guide shaft 1 and the bearings 6a, 6b, the above-mentioned cable 8 will be unwound unnecessarily.

Furthermore, if the foreign object naturally comes off while the cable 8 is sagging, a dangerous situation may occur in which the light shield 2 suddenly descends.

In view of the above problems, the present invention has been developed so that even if the light shield stops due to unforeseen circumstances during descent, the cable does not sag, and the light shield reaches the lower limit of the descending position. Another object of the present invention is to provide a lifting device for a light shielding body for an automobile, which can prevent cables from sagging.

〓Means for Solving the Problem〓 In order to achieve the intended purpose, the present invention has a vertical guide shaft installed near a window inside an automobile, and the base end of a light shield placed inside the window. A winder having a cable that passes through the section and in which the guide shaft and the light shield are fitted together and can be freely wound and unwound, and a motor that serves as a drive source for the winder. and a transmission system for transmitting the rotation of the motor to the winder, and a winding mechanism is installed near a window in the automobile, and a cable of the winding mechanism is connected to the light shielding body, In the lifting device for a light shielding body for an automobile in which the light shielding body is provided so as to be movable up and down, a swinging arm having a pulley is pivotally attached to a mounting portion set near a window in the vehicle; A normally closed switch incorporated in the circuit of the motor is disposed, and the opening/closing operation piece of the normally closed switch and a swinging arm are close to each other so as to freely collide with each other, and the swinging arm is provided with a spring. A force in one direction of the opening/closing operation is applied through the swing arm, and the cable is hooked to the pulley of the swinging arm so as to pull the swinging arm away from the opening/closing operation piece. It is characterized in that the load of the light shielding body is applied, and the load applied to the swing arm and the force of the spring are balanced with each other.

〓Operation〓 In the case of the device of the present invention, when the winder is rotated forward or backward by switching on the motor to wind up or unwind the cable, the light shielding body is raised and lowered.

If a trouble occurs and the light shield stops during the lowering of the light shield, the uncoiled cable will sag, but at the same time as this sag occurs, the swinging arm will The normally closed switch is rotated to one side via a spring, and the open/close operation piece is pushed in to turn the normally closed switch off.

Thus, the motor circuit becomes open circuit and the winder stops rotating, thereby preventing the cable from being unwound unnecessarily.

Similarly, when the light shield reaches the lower limit of its lowered position, the cable will sag and at the same time, unnecessary unwinding of the cable will be prevented.

〓Example〓 Hereinafter, an example of the device of the present invention will be described with reference to the drawings.

In a large vehicle 21 such as a bus or a truck shown in FIG. 1, a guide shaft 31 extending vertically is attached via bearing brackets 32 and 33 near a window 22 inside the vehicle 21.

The light shielding body 34 includes a light shielding plate 35 and a light shielding plate 35.
It consists of a support shaft 36 attached to the support shaft 36 and a guide device 37 attached to the base end of the support shaft 36, and synthetic resin slip rings are built into the guide device 37 as bearings 38, 39. There is.

The light shielding body 34 has its guide device 37 penetrated by the guide shaft 31, and the guide shaft 31 and the bearings 38, 39 are fitted to each other, so that the guide shaft 3
It can be assembled into 1 so that it can be raised and lowered freely.

A winding mechanism 40 for raising and lowering the light shielding body 34 includes a drum-shaped winder 42 equipped with a cable 41 that can be freely wound and unwound, and a motor 43 that serves as a drive source for the winder 42. and a transmission system 44 for transmitting the rotation of the motor 43 to the winder 42, and the transmission system 44 includes a worm gear 44a and a worm wheel 44b as shown in the illustrated example.

This winding mechanism 40 is installed in a window 2 in an automobile 21.
2, and the end of the cable 41 is connected to the guide device 37.

The configuration of the device of the present invention described above is basically the same as that shown in FIG. 2 as a conventional example.

In the case of the device of the present invention, the following improvements have been made in this configuration.

That is, in FIG. 1, the ceiling near the window 22 in the automobile 21 or a mounting plate attached to the ceiling is set as the mounting part 45,
A swing arm 48 having a pulley 46 at its tip and a protrusion 47 in the middle in the longitudinal direction is pivotally attached to the mounting portion 45 via a bearing stand 49 .

A tension type spring 50 is attached between the swinging arm 48 and the vertical wall of the mounting portion 45.
0, a force in the direction of arrow A in FIG. 1 is applied to the swinging arm 48.

The intermediate portion of the cable 41 connected to the light shielding body 34 is sequentially hooked to the pulley 46 of the swinging arm 48 and the pulley 51 attached to the horizontal wall of the mounting portion 45, and thus the swinging arm 48 , the load on the light shielding body 34 is applied so as to act in the direction of arrow B in FIG.

In this case, so that the force in the direction of the arrow A (the force of the spring 50) acting on the swinging arm 48 and the force in the direction of the arrow B (the load of the light shielding body 34) are balanced with each other,
The force of spring 50 is set or adjusted.

The circuit of the motor 43 described above includes a power supply 52, a polarity reversal switch 53, and a normally closed switch 54.

Of these, the polarity reversal switch 53 has a well-known configuration that can be switched between forward motor rotation, reverse motor rotation, and neutral (switch off) states, and the normally closed switch 54 has a fixed contact 55 and a movable contact 5.
6 and its movable contact 56
The opening/closing operation piece 57 is used to close the fixed contact 55.
It consists of a combination with a spring 58 attached to.

The normally closed switch 54 is attached to the mounting portion 45 so that its opening/closing operation piece 57 can collide with the protrusion 47 of the swinging arm 48, and these protrusions 47 and opening/closing operation piece 57 are close to each other. They are facing each other.

Also in the device of the present invention illustrated in FIG. 1, the guide shaft 31 and the bearings 38, 39 of the guide device 37 are relatively fitted, and the light shield 34 can be moved up and down along the guide shaft 31. The winding mechanism 40 is operated by operating the polarity reversing switch 53 from the neutral position to the motor forward rotation position or from the neutral position to the motor reverse rotation position.
The motor 43 of the cable 4 is rotated in the forward or reverse direction, and the rotation is transmitted to the winder 42 through the transmission system 44 to
By unwinding or unwinding 1,
The light shielding body 34 is raised and lowered.

If an unexpected trouble occurs when the light shielding body 34 is lowered and the light shielding body 34 stops,
The cable 41 in the unwound state sag, but at the same time as this sag occurs, the swinging arm 48 rotates via the spring 50 toward the opening/closing operation piece 57 of the normally closed switch 54. Then, the opening/closing operation piece 57 is pushed in to turn off the normally closed switch 54, so the motor circuit becomes an open circuit and the rotation of the motor 43 and the winder 42 is stopped.
Unnecessary unwinding of 1 is prevented.

Even when the light shield 34 reaches the lower limit of its lowered position and the cable 41 sag, the cable 41 is prevented from unwinding unnecessarily in the same manner as described above.

To change the circuit of the motor 43 which is in an open circuit state to a closed circuit, operate the polarity reversal switch 53 to the motor reverse reversal position to wind the cable 41, and in this state, pull down the cable 41 once and swing it. The arm 48 only has to be separated from the opening/closing operation piece 57, and the opening/closing operation piece 57 is thereby returned to its original position via the spring 58, and the movable contact 56 is brought into closed contact with the fixed contact 55.

The motor is thus reversely rotated, the cable 41 is wound in the same manner as before, and the closed circuit state of the motor 43 is also maintained.

Thereafter, if the polarity reversal switch 53 is held at the neutral position, the motor 43 is stopped.

Below, operate the motor 43 in the same manner as above,
What is necessary is just to raise and lower the light shielding body 34.

As the light shielding body 34 in the present invention, a well-known one is appropriately adopted, and other constituent members are also metal,
Synthetic resins, conductors, insulators, etc. are used in the right places.

The spring 50 may be a compressed type spring in contact with the left side of the swinging arm 48 (FIG. 1), or a coiled spring may be fitted to the fulcrum shaft of the swinging arm 48 and one end of the coil spring The coil spring may be fixed to the swing arm 48 and the other end of the coil spring may be fixed to a location other than the swing arm 48, and such means can also apply a force in a predetermined direction to the swing arm 48.

〓Effects of the invention〓 As explained above, the present invention operates a winding mechanism using a motor to wind up the cable, or unwind it to raise and lower the shading body. When trouble occurs or the light shield reaches its lowering limit, the motor circuit automatically opens, thereby preventing the cable from being unwound unnecessarily.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing one embodiment of the device of the present invention, and FIG. 2 is a schematic diagram of a conventional device. 21...Car, 22...Car window, 31
... Guide shaft, 34 ... Light shield, 35 ... Light shield plate of light shield, 36 ... Support shaft of light shield, 37 ... Guide device, 40 ... Winding mechanism, 41 ... Cable of winding mechanism 42... Winder of the winding mechanism, 43... Motor of the winding mechanism, 44... Transmission system of the winding mechanism, 45...
... Attachment part, 46 ... Pulley of rocking arm, 48 ... Rocking arm, 50 ... Spring, 52 ... Power source of motor, 54
... Normally closed switch, 55 ... Fixed contact of normally closed switch, 56 ... Fixed contact of normally closed switch,
57...Opening/closing operation piece of a normally closed switch.

Claims (1)

[Scope of utility model registration request] A vertical guide shaft installed near a window inside the vehicle passes through the base end of a light shield placed inside the window, and these guide shafts and light shield fit into each other. In addition, a winding device comprising a winder equipped with a cable that can be wound up and unwinded, a motor serving as a drive source for the winding device, and a transmission system for transmitting the rotation of the motor to the winding device. A lifting device for a light shielding body for an automobile, in which a winding mechanism is installed near a window in the vehicle, a cable of the winding mechanism is connected to the light shielding body, and the light shielding body is provided so as to be freely raised and lowered. A swinging arm with a pulley is pivotally attached to the mounting part set near the window inside the car, and a normally closed switch incorporated in the circuit of the motor is arranged. The opening/closing operation piece of the type switch and the swinging arm are closely opposed to each other so as to freely collide with each other, and a force in one direction of the opening/closing operation is applied to the swinging arm via a spring, and the pulley of the swinging arm is applied with a force in one direction. The cable is hooked so as to separate the swinging arm from the opening/closing operation piece, and the load of the light shield is applied to the swinging arm, and the load applied to the swinging arm and the load of the spring are A device for lifting and lowering automotive light shielding bodies whose forces are balanced with each other.