JPH0571266A - Rotary damper - Google Patents

Abstract

PURPOSE:To install a rotary damper with a simple structure in a narrow space, by providing a shaft extending downward to the center of upper containing chamber at the lower face of the upper lid and fixing the inner end of a spring and providing separately in the peripheral direction a plurality of grooves in which the protrusion provided at the outer edge of spring is fitted. CONSTITUTION:A shaft 23 protruding downward at the coaxial position with a rotary body 20 with a gear and extending into the spring chamber of the rotary body 20 is provided at the lower face of an upper lid 22. And the inner end 3a of spring 3 is supported by the slit 23' provided at the shaft 23. And a plurality of grooves 21' are made every specified distance in the peripheral direction at the inner peripheral wall of the spring chamber opened to the upper face of the rotary body 20. And the cylindrically formed protrusion 3b of the outer end of spring 3 is inserted in the groove 21'. The restoration force that the spring 3 has for opening the cassette cover or the elastic force of the spring 3 resisting the strength is defined to be a specified strength by selection of the groove 21' containing the protrusion 3b on assembling the device.

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 and closing bodies, urges the opening and closing bodies in the opening direction by a spring, and causes the movement of the opening and closing bodies in both opening and closing directions to be performed quietly by braking with a shear resistance of viscous fluid. ..

[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 must be fixed by crimping both ends of the outer case, the axial dimension of the device becomes significantly large, and it is used for automobile seat belts, parachute ropes, life-saving device ropes. TV, even if it can be used in a place where there is no obstacle even if it is large
It cannot be installed in a limited space, such as home appliances such as video recorders and tape recorders, ashtrays for automobiles, etc., and it is troublesome to assemble both ends of the outer case by caulking. Furthermore, the restoring force of the mainspring cannot be adjusted.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides a small rotary damper which uses a small number of parts having a simple structure, can adjust the restoring force of a mainspring, and can be installed in an extremely limited narrow space. It has been developed to obtain a main body of a device having an opening / closing body, or a mounting substrate fixed to either one of the opening / closing body, a braking plate, and a shaft provided downward at the center of the lower surface thereof. A lower end of the shaft is fixed to the mounting substrate in a non-rotatable manner, a gear part is provided on the outer periphery, and upper and lower storage chambers separated by an inner bottom plate are provided on the inner periphery. A damper braking plate and a viscous fluid are contained and rotatably supported on the mounting substrate.
A rotating body with a gear that is interlocked with the opening and closing movement of the opening and closing body and is rotated by the damper to rotate in both forward and reverse directions, a mainspring housed in an upper storage chamber of the rotating body, and a gear with the gear fixed to the mounting substrate. It consists of an upper lid that covers the rotating body, and a hanging shaft that hangs down to the center of the upper housing to fix the inner end of the mainspring is provided on the lower surface of the upper lid. It is characterized in that a plurality of grooves, which are engaged with the ridges, are provided in the inner circumference so as to be separated in the circumferential direction.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, 1 is a mounting board having a mounting means 1a such as a claw for mounting on a device to be used, a hole for passing a screw, 3 a spring, 6 is a shaft 7, and from the upper end of this shaft. Shown is a damper with an overhanging brake plate 8, 20
Is a rotating body with a gear having a gear portion on the outer periphery, 22 is an upper lid, and the mounting substrate 1, the damper 6, the rotating body with a gear 20,
The upper lid 22 is 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.

An inner bottom plate 21 is provided on the inner circumference of the rotating body 20 with gears.
A spring chamber opened to the upper surface and a housing portion opened to the lower surface are provided by partitioning with, and the braking plate 8 of the damper 6 is housed in the housing portion opened to the lower surface. A seal disk 11 is fitted on the shaft 7 of the damper, and the peripheral edge of the seal disk is welded to the inner peripheral wall of the accommodating portion to prevent the oil of the viscous fluid immersing the braking plate from leaking.
The lower end of the damper shaft 7 is fitted into a non-circular hole 1'in the center of the mounting substrate 1 to prevent rotation. A circular protrusion protruding downward from the center of the lower surface of the inner bottom plate 21 is inserted into the circular recess of the damper shaft. As a result, even when the rotating body rotates in either direction on the mounting substrate, the damper does not rotate and brakes the rotation of the rotating body.

A plurality of grooves 21 'are provided on the inner peripheral wall of the spring chamber opened on the upper surface of the rotating body 20 so as to be circumferentially spaced.
The cylindrical ridge 3b at the outer end of the mainspring 3 is housed therein.

The upper lid 22 is placed on the rotating body 20, and is integrally connected to the mounting board while the rotating body 20 is lightly sandwiched between the mounting board 1. Reference numeral 22 'denotes a leg snap-fitted to the claw 9 "of the mounting substrate for that purpose. On the lower surface of the upper lid 22, there is a shaft 23 projecting downward at a position concentric with the rotating body 20 and projecting into the spring chamber, A slit 23 'provided at the lower end of the shaft 23 supports the inner end 3a of the mainspring 3.

Therefore, if 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 portion of the rotating body 20 when the cassette lid is opened and closed, it opens. When the cassette lid is closed, the rotating body 20 rotates the mainspring 3 from the outer end side in the winding direction so that the mainspring is wound and the restoring spring force is accumulated in the spring. In addition, since the lower surface of the upper wall of the accommodating portion of the rotating body and the seal disk 11 face the braking plate 8 of the damper that does not rotate with the oil 12 having a high viscous resistance interposed, the rotation of the rotating body causes the viscous resistance of the oil. Is braked at. Closing the cassette lid in this way must be done against the gradually increasing restoring spring force of the mainspring and the viscous resistance of the oil.
It is possible to prevent the cassette lid from being closed violently or roughly.

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 the push button or the like is pressed to open the cassette lid and the lock mechanism is released, the mainspring 3 that has been tightened is unwound by the unwinding force.
Rotate in the opposite direction to open the cassette lid. However, since the rotation of the rotating body is damped by the viscous resistance of oil as described above, the cassette lid is opened gently.

Groove 2b for receiving the protrusion 3b at the outer end of the mainspring
Since a plurality of springs are provided on the inner peripheral wall of the spring chamber so as to be separated from each other in the circumferential direction, there is no strong restoring force stored by the mainspring for opening the cassette lid by selecting the groove into which the protrusion 3b is inserted at the time of assembly. The strength of the elastic force of the mainspring against the force when closing the can be set as desired. The upper lid 22 has one or a plurality of holes 13 communicating with the groove 2b.
After assembling, insert a thin pin from this hole after assembly and insert it into the cylindrical ridge 3b at the outer end of the mainspring, and then rotate the rotating cylinder from the outside in one direction or the other. It is also possible to turn the protrusion 3b out of the groove that has been inserted up to now and insert it in one or two adjacent grooves to change the strength of the spring of the mainspring to be stronger or weaker than during assembly. ..

[0013]

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 restoring force of the mainspring can be adjusted as desired by which of a plurality of circumferentially spaced grooves formed on the inner peripheral wall of the spring chamber the outer end of the mainspring is engaged with. Moreover, by providing a hole communicating with the groove on the mounting substrate or the upper lid, the groove with which the protrusion at the outer end of the main spring engages can be changed even after assembly to adjust the restoring force of the mainspring.

Further, since the damper braking plate and the mainspring are housed in the inner circumference of the rotating body with gears rotating on the mounting substrate, the axial dimension of the entire apparatus becomes very small, and it is extremely limited and narrow. A small rotary damper that can be installed even in a space can be provided with high productivity.

[Brief description of drawings]

FIG. 1 is a perspective view of a disassembled state.

[Explanation of symbols]

 1 Mounting board 3 Mainspring 3b Protrusions on outer end of mainspring 6 Damper 7 Shaft 8 Braking plate 20 Rotating body with gear 21 Groove 22 Top lid 23 Shaft

Claims (2)

[Claims] 1. A main body of a device having an opening / closing body, or a mounting substrate fixed to either one of the opening / closing body, a braking plate, and a shaft provided downward at the center of the lower surface thereof. A damper whose lower end is fixed to the mounting substrate so as not to rotate, a gear portion on the outer periphery, and upper and lower storage chambers separated by a middle bottom plate on the inner periphery, and the damper plate of the damper in the lower storage chamber. And a rotating body with a gear that accommodates a viscous fluid and is rotatably supported on the mounting substrate, and is rotated in both forward and reverse directions by being braked by the damper in conjunction with the opening / closing movement of the opening / closing body. A mainspring housed in an upper housing chamber, an upper lid that is fixed to the mounting substrate and covers the rotating body with gears, and a hanging shaft that hangs down to the center of the upper housing chamber and fixes the inner end of the mainspring on the lower surface of the upper lid. If a ridge is provided on the outer end of the mainspring, In addition, the rotary damper is characterized in that a plurality of grooves, which are engaged with the protrusions, are provided in the inner circumference of the upper accommodation chamber so as to be circumferentially separated from each other. 2. The rotary damper device according to claim 1, wherein the upper lid is provided with a hole that can be touched by a protrusion at the outer end of the mainspring engaged with a groove on the inner periphery of the upper storage chamber. Rotating damper device.