JPH0571262A - Rotary damper - Google Patents

Abstract

PURPOSE:To simply assemble a rotary body with a normally and reversely rotating gear, receiving a braking action on a fitting base plate, to omit the assembling labors. CONSTITUTION:A guard 4d extended from the outer periphery is provided at the lower end of a rotary body 4 and a covering wall 9 enclosing more than the half circumference of the rotary body with the gear is provided on the fitting base plate 1. And a slant face is diagonally provided upward at the inner periphery of the covering wall 9 and a plurality of claws 9' are provided to fit snap to the guard of the rotary body with the gear at the lower face.

Description

Detailed Description of the Invention

[0001]

This invention incorporates a mainspring,
Main body of equipment used, which has opening and closing bodies such as cassette lids and doors,
Alternatively, the present invention relates to a rotary damper device that is fixed to either one of the opening / closing bodies, urges the opening / closing bodies in the opening direction by a mainspring, and brakes the opening / closing bodies in both opening and closing directions to quietly perform the operations.

[0002]

2. Description of the Related Art A large impact applied to a seat belt at the time of collision of an automobile, an impact on a rope when a parachute is opened, an impact on an evacuation rope when evacuating from a high place, etc. A rotary damper device for receiving and absorbing the impact is disclosed in Japanese Examined Patent Publication No. 54-311.
It is known from Japanese Patent Publication No. 46. The above device penetrates a fixed shaft at the center of the inner circumference of a cylindrical inner case having a complicated inner peripheral curved surface composed of three or more epitrochoid curved surfaces, and the epitrochoid is fixed to the fixed shaft. It has a number of vertices different from the number of curved surfaces, and one of the vertices is always in contact with the inner peripheral curved surface of the inner case with a slight gap fixed to the axially long stator, A viscous fluid is filled between the inner curved surface of the case and the outer circumference of the stator, and the inner end of the mainspring is fixed to one end of the fixed shaft protruding from the inner case. It is fixed to the inner circumference of the spring chamber adjacent to the case, and the inner case and the spring chamber are fitted into the outer case and integrally connected.

[0003]

In the above apparatus, when a torque due to impact is applied to the outer case, the inner case tries to rotate around the stator, so that the inner peripheral curved surface of the inner case and the outer periphery of the stator are separated from each other. Volume changes occur in the multiple spaces formed in the space, and viscous fluid in the space that changes from large to small tends to flow into the space that changes from small to large through the gap at the top of the stator. The outer case rotates in the opposite direction due to the spring's restoring force, but the outer case rotates in the opposite direction when the shock is removed. Due to the complicated inner peripheral curved surface and the complicated outer shape of the stator fixed to the fixed shaft, it is troublesome to manufacture them and the cost is very high.

Further, the inner case and the spring chamber containing the mainspring are housed in the outer case in the axial direction,
Since the inner case and the spring chamber are held by crimping both ends of the outer case, the axial dimension of the device becomes significantly large, and it is large for automobile seat belts, parachute ropes, lifesaving device ropes, etc. Even if it can be used in a place where there is no problem, it cannot be installed in a limited narrow space such as home electric appliances such as TVs, video recorders, tape recorders, and ashtrays of automobiles. It is troublesome to crimp both ends and productivity is poor.

[0005]

Therefore, the present invention was developed to obtain a small rotary damper that uses a small number of parts having a simple structure and can be installed in an extremely limited and narrow space. And a mounting board fixed to either the main body of the device having the opening / closing body or the opening / closing body, and rotatably attached to the mounting board via a damper, and linked with the opening / closing movement of the opening / closing body. And a geared rotating body that is braked by a damper and rotates in both forward and reverse directions; one end is fixed to the mounting substrate and the other end is fixed to the geared rotating body, and tightened when rotating in one direction. In a rotary damper device having a mainspring for accumulating a restoring force, a flange extending from the outer circumference is provided at the lower end of the geared rotary body, and the mounting substrate has an enclosure wall surrounding more than half the circumference of the geared rotary body. Provided, towards the inclined surface on the inner periphery of the surrounding wall on the diagonal, characterized in that a plurality of pawls that flange and snap engagement of the gear with the rotating body on the lower surface.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In each of the embodiments shown in the drawings, 1 is a mounting board having mounting means 1a such as a claw for mounting on a device to be used and a hole for passing a screw, 3 is a spring, 6 is a shaft 7, and an upper end of this shaft. 1 shows a damper having a braking plate 8 extending from the mounting substrate 1 and the damper 6 are made of plastic.
The damper 6 may be formed by integrally molding the shaft 7 and the braking plate 8 with plastic, or may be separately molded and assembled so as to rotate integrally.

In the embodiment shown in FIGS. 1 to 3, 4 is a rotating body with a gear formed of plastic, and the gear 5 is concentrically and integrally provided on the upper surface thereof. This rotating body has a hollow portion whose lower surface is open and whose upper surface is closed. The lower half of the hollow portion has a large diameter and the upper half has a small diameter. The large diameter hollow portion 4b and the small diameter hollow portion 4c. A step 10 is formed between them. Further, the rotating body 4 has, for example, four window holes 4a at equal intervals in the circumferential direction on the peripheral wall of the large-diameter hollow portion 4b, and has a collar 4 at the lower end.
d.

On the upper surface of the mounting board 1, there is a low surrounding wall 9 around which the collar 4d of the rotating body fits, and on the inside of the surrounding wall of the collar 4d when the rotating body is pushed onto the mounting board. There is a claw 9'for snapping the top surface. If necessary, a cutout 9a may be formed in the surrounding wall so that the rotary cylinder can be pushed in to facilitate snap-fitting.

The inner diameter of the small-diameter hollow portion 4c of the rotating body 4 described above is slightly larger than the diameter of the braking plate 8 of the damper 6.
Further, in this embodiment, the holding cylinder 2 made of plastic is fitted to the inner circumference of the large-diameter hollow portion 4b therebelow. The height of the holding cylinder 2 is slightly lower than the height from the lower end of the rotating body 4 to the step 10 on the inner circumference. In order to rotate the holding cylinder 2 integrally with the rotating body 4, the holding cylinder 2 has a projection 2a corresponding to the window hole 4a in the peripheral wall of the rotating body on the outer circumference and the outer end of the mainspring 3 on the inner circumference. A plurality of grooves 2b are provided in the circumferential direction for fastening the protrusions 3b which are provided by being rolled into a shape. In order to hold the inner end 3a of the mainspring, a slit 7a is provided at the lower end of the shaft 7 of the damper from the lower end. There is a non-circular portion 7'at the lower end of the shaft 7, which is non-rotatably mounted in a non-circular hole 1'in the center of the inside surrounded by the surrounding wall of the mounting substrate, and at the upper end of the shaft. Has a circular recess 7 ", and is adapted to receive a circular projection 4l which projects downward from the center of the upper wall of the rotating body 4.

For assembling, both surfaces of the damper braking plate 8 and, if necessary, the inner surface of the small-diameter hollow portion 4c of the rotor 4 above the step 10 are coated with highly viscous oil such as silicone grease, and the damper 8 is rotated. Put it in the hollow part of the body 4 from below,
The recess 7 ″ at the upper end of the shaft 7 is fitted into the protrusion 4 e so that the braking plate 8
Is placed in the small diameter hollow portion 4c. Then axis 7 in the center
A rubber seal disk 11 having a hole through which the outer diameter is approximately the same as the outer diameter of the holding cylinder 2 is fitted onto the shaft 7 of the damper from below, and the peripheral edge of the seal disk 11 is received by the step 10 (of course). , The seal disk 11 may be fitted and placed on the shaft 7 of the damper before the damper is put into the rotating body).

Next, the holding cylinder 2 is attached to the large-diameter hollow portion 4 of the rotating body 4.
It is fitted from the bottom into b, and the projection 2a on the outer periphery is snap-fitted onto the lower edge of the window hole 4a in the peripheral wall of the rotating body 4 so that the holding cylinder 2 can rotate integrally with the rotating body 4. The peripheral edge of the sealing disk 11 is compressed into the step 10 at the peripheral edge of the upper surface of the.
If necessary, the peripheral edge of the seal disk 11 may be fixed to the step 10 by swaging (welding) or the like. As a result, the damping plate 8 of the damper and the oil 12 are stored in the small-diameter hollow portion 4b of the rotating body.
Then, it is housed in a housing portion 4'formed by a seal disk 11 that closes the disk from below.

Incidentally, in this embodiment, the holding cylinder 2 has an upper wall 2'having a central hole through which the shaft 7 of the damper penetrates slightly below the upper end thereof, and the lower surface thickened downwardly of the sealing disk 11 is turned up. Although it is supported on the wall, this upper wall can be omitted. Then, the inside of the holding cylinder 2 is used as a spring chamber, and the mainspring 3 is housed therein, and the inner end 3a thereof is inserted into the slit 7a at the lower end portion of the damper shaft 7, and the ridge 3b at the outer end is arranged inside the holding cylinder 2. It is placed in one of the circumferential grooves 2b, and when the cassette lid that is open is closed, the mainspring 3 is appropriately crimped to resist closing the cassette lid, and the elastic force when the cassette lid is opened next is provided. Be able to store.

After setting the mainspring in this manner, the holding cylinder 2 and the holding cylinder 2 are fitted together with the non-circular portion 7'of the lower end of the shaft 7 of the damper projecting from the lower surface of the rotating body 4 in the non-circular hole 1'of the mounting substrate. The rotating body 4 is pushed into the surrounding wall 9 of the mounting substrate, and the upper surface of the collar 4c of the rotating body is snap-fastened by the claw 9'on the inner circumference of the surrounding wall as described above.

As a result, the circular projection 4 "protruding downward from the center of the upper wall of the rotor is inserted into the circular recess 7" at the upper end of the shaft 7 of the damper 6 and is supported, and the non-circular portion 7'at the lower end of the shaft 7 is supported. Is a non-circular hole 1'in the center surrounded by the surrounding wall of the mounting substrate
Upon entering, the damper 6 is non-rotatably positioned, and the rotary cylinder 4 becomes rotatable with the holding cylinder 2 on the mounting substrate.
In order to reduce the friction between the rotating body and the mounting substrate, the rotating body 4
The contact area may be reduced by, for example, forming a downward sharpened portion at the lower end of the contact point.

Therefore, when the mounting substrate 1 is fixed to either the cassette lid or the main body, and the other is provided with a gear or a sector gear that meshes with the gear 5 of the rotating body 4 when the cassette lid is opened and closed, it opens. When the cassette lid is closed, the rotating body 4 and the holding cylinder 2 are rotated integrally with the gear 5 in the direction of winding the mainspring 3 from the outer end side to wind the mainspring. In addition, since the lower surface of the upper wall of the rotating body 4 and the upper surface of the seal disk 11 face the braking plate 8 of the damper that does not rotate via the oil 12 having high viscous resistance, the rotation of the rotating body is caused by the viscosity of the oil. Braked with resistance. Since the cassette lid must be closed against the spring force of the spring and the viscous resistance of the oil, it is possible to prevent the cassette lid from being closed violently or violently. Then, when the cassette lid is completely closed, an appropriate lock mechanism provided between the cassette lid and the main body operates to keep the cassette lid closed. When a push button or the like is pushed to open the cassette lid and the lock mechanism is released, the unwinding power of the mainspring 3 causes the rotating body 4 together with the holding cylinder to rotate in the opposite direction by the unwinding force, and the cassette lid is opened. However, since the rotation of the rotating body is damped by the viscous resistance of the oil 12 as described above, the cassette lid is opened gently.

If a plurality of grooves 2b for receiving the protrusions 3b on the outer end of the mainspring are provided in the circumferential direction of the spring chamber as in this embodiment, the cassette lid is selected by selecting the groove for inserting the protrusions 3b during assembly. The strength of the elastic force stored by the mainspring for opening the mainspring is not strong, and the strength of the elastic force of the mainspring against the force when the cassette lid is closed can be determined as desired. Then, if one or a plurality of holes 13 are opened in the mounting substrate 1 at a position communicating with the groove 2b on the inner circumference of the holding cylinder, a thin pin or the like is inserted from this hole to form a cylindrical shape at the outer end of the mainspring. Insert it into the rounded ridge 3b, then turn the rotary cylinder from the outside in one direction or the other direction to let the ridge 3b escape from the groove that has been inserted until now and put it in one or two adjacent grooves. The strength of the spring of the mainspring can be changed to be stronger or weaker than that at the time of assembling.

In this embodiment, the mainspring 3 is replaced with the rotating body 4.
In order to prevent the oil 12 from leaking, the holding cylinder 2 fixes the peripheral edge of the seal disk 11 between the holding cylinder 2 and the step 10 on the inner circumference of the rotating body. belongs to. Therefore, when the peripheral edge of the seal disk is fixed to the inner circumference of the rotating body by welding or the like, the holding cylinder can be omitted, and the large-diameter hollow portion 4b of the rotating body serves as a spring chamber, and the outer end of the mainspring is provided on the inner circumference thereof. The groove 2b may be formed to receive the protrusion 3b. Further, the inner end 3a of the mainspring is fixed to the slit at the lower end portion of the shaft 7 of the damper which is non-rotatably fixed on the mounting substrate, but this may also be directly fixed to the mounting substrate instead of the shaft of the damper.

In the embodiment shown in FIGS. 4 to 6, the mounting substrate 1 has an arcuate surrounding wall 9 which is slightly larger than the half circumference, and the geared rotary body 13 having an integral gear part on the outer periphery extends from the outer periphery to the lower end. The rotary body 13 is provided with a collar 13a and is provided in the inner circumference of the surrounding wall 9.
When is pushed in, the flange 13a is snapped on the upper surface by the claw 9'protruding from the inner circumference of the surrounding wall, and the rotating body is rotatably held.

The rotating body 13 has a braking plate 8 of the damper 6 and an accommodating portion 13 'opened at the lower surface for accommodating the oil 12.
Have. The shaft 7 of the damper has a circular recess at the upper end, and a circular protrusion protruding downward from the center of the upper surface of the housing portion 13 'of the rotating body projects into the recess. A seal disk 11 is fitted on the damper shaft 7, and the peripheral edge of the disk is fixed by welding or the like in the middle of the inner circumference of the accommodating portion 13 'to prevent the oil 12 immersing the braking plate 8 from leaking out. The non-circular protrusion 7'at the lower end of the damper shaft projects into the non-circular hole 1'in the center of the substrate 1, and the damper does not rotate even when the rotating body 13 with gears rotates. Brake movement

A short shaft 14 stands up from the center of the upper surface of the rotating body, and a slit 14 'is formed from the upper end of the shaft 14 so as to hold the inner end 3a of the mainspring 3. A cap 15 having a diameter smaller than or smaller than the root diameter of the gear portion of the rotor is placed on the upper surface of the rotor to cover the mainspring 3.
The cap 15 has several legs 15 '... Which project outward and then bend downward. The lower end of each leg is the mounting board 1
It is snap-fastened to a claw 9'provided on the outer peripheral surface of the surrounding wall 9 and integrated with the mounting substrate.

The outer end 3b of the mainspring is pulled out from the hole on the side of the cap 15. At this outer end, a mounting piece 16 is mounted sideways.
Is fixed, and when the cap 15 is pressed against the mounting board 1 and snap-fastened, the mounting piece 16 is placed between the contact plates 17 and 18 that are in contact with the cap and the mounting board in the vertical direction.
Sandwich. As shown in the drawing, it is preferable that the mounting piece 16 is provided with a hole, and one of the contact plates is provided with a protrusion projecting into the hole.

Further, in order to support the mainspring 3 on the upper surface of the rotating body 13 separately from each other, the inner surface of the cap is provided with receiving plates 19 and 19 which face each other slightly above the lower end, and the mainspring 3 is provided with the receiving plate 1.
Housed on 9,19. In this embodiment, the main end of the mainspring 3 is fixed to the rotating body, and the outer end of the mainspring 3 is fixed by the mounting substrate 1 and the cap integrally connected to the mounting substrate 1, whereby the rotating body is moved by one movement of the cassette lid. Rotate in the direction to tighten the spring from the inner end to accumulate the restoring force, operate the push button etc. to open the closed cassette lid, and release the lock mechanism to open the lid with the restoring force of the spring. And since the damper brakes both the opening and closing of the lid, it prevents it from being closed roughly and opens gently when opening.

[0023]

As is apparent from the above, according to the present invention, it is possible to provide a damper device for braking both opening and closing movements of the opening / closing body by the mainspring and opening the opening / closing body by the restoring force of unwinding the mainspring. The rotating body with gears that rotates on the mounting board is rotatably held with respect to the mounting board by being pushed into the surrounding wall of the mounting board, which has a half circumference or more, and therefore does not require labor for assembly. Thus, according to the present invention, it is possible to provide a small-sized rotary damper having a very small axial dimension and capable of being installed even in an extremely limited narrow space with high productivity.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a first embodiment in an assembled state.

FIG. 2 is a perspective view of a disassembled state.

FIG. 3 is a perspective view of the holding cylinder viewed from the opposite direction to that of FIG.

FIG. 4 is a plan view of an assembled state of the second embodiment.

FIG. 5 is a vertical sectional view of a second embodiment.

FIG. 6 is a perspective view of a disassembled state.

[Explanation of symbols]

 1 Mounting Substrate 3 Spring 4 Rotating Body 4d Tsuba 6 Damper 9 Arc Wall 9'Claw 13 Rotating Body 13a Tsuba

Claims (1)

[Claims] 1. A main body of a device having an opening / closing body, or a mounting board fixed to either one of the opening / closing body and a mounting body rotatably mounted on the mounting board via a damper to open / close the opening / closing body. A rotating body with a gear that is braked by a damper and rotates in both forward and reverse directions in conjunction with
A rotary damper device having the other end fixed to the geared rotary body and having a mainspring that is wound up when the geared rotary body is rotated in one direction to accumulate a restoring force, at the lower end of the geared rotary body. In addition to providing a flange extending from the outer periphery, the mounting substrate is provided with an enclosure wall that surrounds at least half the circumference of the geared rotary body, the slope is directed obliquely upward on the inner periphery of the enclosure wall, and the geared rotary body is provided on the lower surface. A rotary damper device comprising a plurality of claws that are snap-engaged with the collar.