JPH0217860B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary damper that is attached to and attached to a main body, such as a cassette lid or door, and that brakes the reciprocating motion of a reciprocating body that can reciprocate.

Utility Model Publication No. 56-50572, Utility Model Application Publication No. 1983-1983 discloses the use of such a damper to brake the sudden opening of the tape cassette lid of a tape recorder or video cassette due to the traction force of the spring.
82614, 56-103902, and 56-111403. All of these brake the rotational input by the frictional force between the rotating body that rotates in response to rotational input and the main body that surrounds it or faces the rotating body, so it will wear out after long-term use. , the braking effect is lost. Therefore, the present applicant proposed a damper that rotates a rotating body in a highly viscous oil such as silicone grease or in contact with the oil, and performs braking using the viscous resistance of the oil, thereby solving the problems of dampers caused by frictional force. .

However, all of these conventional dampers are designed to operate when the locking mechanism that locks the rotating body of the cassette lid in the closed position is unlocked by pressing a push button, etc., so the cassette lid and main body In addition to a damper and a spring that always pulls the cassette lid to the open position, it is necessary to incorporate a lock mechanism to lock the cassette lid in the closed position, which requires a large number of parts and requires a lot of effort to assemble. However, there is a problem that the cost is high.

Therefore, the present invention uses a spring such as a mainspring or a coil spring that can be tightened from one end. For example, when closing an open cassette lid by hand, the mainspring or coil spring is tightened from one end to gradually apply braking. In addition to preventing the cassette lid from closing abruptly, the locking member prevents the spring from unraveling when the cassette lid is fully wound, keeping the cassette lid in the closed position. By removing the member and allowing the spring to unwind, the spring was braked and unwound to gently open the cassette lid. Therefore, according to the present invention, the reciprocating motion of the reciprocating body can be braked simply by providing a damper between the reciprocating body and the main body, and a gear, a sector gear, a rack gear, etc. that meshes with the teeth of the damper's gear. It has the advantage of not wearing out even after long-term use.

Hereinafter, the present invention will be described with reference to the drawings, assuming that the reciprocating body is a cassette lid.

In the first embodiment shown in Figs. 1 to 5, reference numeral 1 denotes a mounting board having a fixing means 1' such as a hole through which a claw or a screw is passed for mounting on the equipment used, and an arcuate wall 2 having a length slightly longer than half the circumference on its upper surface. A toothed ring 3 having teeth on the outer periphery is held in the interior surrounded by an arcuate wall, and the teeth are exposed to the outside between both ends of the arcuate wall and move as the cassette lid or the like is opened and closed. They are designed to interlock and rotate. The height of the arc-shaped wall is slightly higher than the thickness of the tooth ring, and the gear ring has a flange 3' at the lower end whose outer diameter is slightly larger than the mountain diameter of the tooth, and the arc-shaped wall has the flange 3' on the inner periphery. When the tooth ring is pushed into the arcuate wall from above, the claw 2a snaps into engagement with the collar 3' to hold the tooth ring.

There is a spiral groove 4 on the top surface of the tooth ring, and the inner end of the spiral groove goes around a heart-shaped island 5 in the center, and a shaft 6 stands up integrally from the center of the top surface. The shaft 6 has a notch 6' that holds the inner end 7a of the mainspring 7. The tooth ring has a concentric circular depression 8 on its lower surface, and a downward protrusion 8' in the center.
There is (Figure 3). This recess 8 is for accommodating a damper 9 that brakes the rotation of the gear in both forward and reverse directions with oil, and a brake disc 10 coated with oil on both the upper and lower surfaces of the protrusion 8' is fixed to the upper end so as not to rotate. A recess 10a at the upper end of the damper shaft 10' is rotatably fitted so that the upper surface of the brake disc and the lower surface of the recess face each other through oil. A seal plate 1 whose upper surface is coated with oil is placed under the damper shaft 10'.
1 is rotatably fitted and the peripheral edge of the seal plate 11 is fixed to the outer periphery of the recess 8 by swaging (welding), and the non-circular protrusion 10b at the lower end of the damper shaft is attached to the center part surrounded by the arcuate wall 2 of the base plate. into the hole 1a of the same shape. As a result, the damper shaft and brake disc do not rotate even when the gear rotates in either the forward or reverse direction, and the bottom surface of the gear recess and the seal plate fixed to the gear by swaging are connected to the top surface of the brake disc. Since the gear rotates in contact with the lower surface via oil, the rotation of the gear is effectively braked. Note that the brake disc and the damper shaft may not be molded separately and assembled, but may be molded integrally.

Reference numeral 12 denotes an upper cover that is attached to the mounting board to cover the gear from above and forms a housing case for the gear together with the mounting board. A small cylindrical accommodating part 12a, which once protrudes outward from both sides of the accommodating part 12a and is received on each end of the arcuate wall 2,
Legs 12 then descend along the outer periphery of the arcuate wall and have their lower ends fastened with claws 2b protruding from the outer surface of the arcuate wall.
Two supporting pieces 12a' on which the mainspring 7 is placed extend inwardly from the lower end of the inner periphery of the holding portion, facing each other.

It is preferable that the mounting board, the gear ring, and the upper cover are each molded of plastic, and the mainspring is accommodated in the accommodation section of the upper cover with its diameter reduced, and the outer end 7b of the mainspring is inserted into the notch 12' provided on the side of the accommodation section 12a. Take it outside.

A spring piece 13 made of an elastic metal plate is attached to the outer end of the mainspring.
When fixing the top cover to the mounting board, the mainspring of the spring piece 13 is secured by the receiving part 1b provided outside the arc-shaped wall of the board and the push plate part 12' extending from the housing part 12a of the top cover. Base 1 protruding at right angles from the outer end
Pinch and secure 3a. 14 is a lever made of elastic metal cotton that acts as a locking member to stop the wound mainspring from unraveling, and is connected to the spiral groove 4 on the upper surface of the gear wheel.
It has a downward end 14a that protrudes into the spring from above, and an upwardly bent other end 14b that is supported by the tip of an extension 13b that extends at a substantially right angle from the base 13a of the spring piece.

A receiving portion 1 is provided on the outer surface of the arc-shaped wall of the mounting board.
A hook 15 is provided opposite the downward leg 1c of the lever 14, and the upward end 14b of the lever 14 is attached to the hook 15.
Hang the vertical shaft part 14' formed near the hook, leaving the upper end, and the upper end is received by the notch 12c provided on the outer surface of the push plate part 12'' of the upper lid to prevent it from coming off the hook, and then The end 14b is hooked onto the folded free end 13' of the extension 13b of the spring piece.A tongue-like protruding piece 13a' is provided at the base 13a of the spring piece to hold down the lever 14 from above. , to stop the lever from sliding upward.

To assemble, insert the damper 9 into the recess on the underside of the gear.
A non-circular protrusion 10 at the lower end of the damper shaft incorporating
b into the corresponding hole 1a of the mounting board, set the gear on the mounting board, and then insert the shaft part 14' of the lever 14 into the hook 15 of the board and the notch 12c of the top cover.
The spiral groove 4 is supported by the spiral groove 4 to serve as a fulcrum, and its downward end 14a projects into the outer end of the spiral groove 4. Then, the upper cover 12 containing the mainspring is placed on the arc-shaped wall of the base plate, and the spring piece 1 at the outer end of the mainspring protrudes from the notch 12'.
3 on the receiving part 1b of the board, and in that state, press down the top cover while fitting the inner end 7a of the mainspring into the cutout 6' of the gear shaft, and press the legs 12b of the top cover against the outer surface of the arcuate wall. Lower it along the line and snap it onto the claws 2b, 2b. As a result, the upper cover is fixed across the arcuate wall, and a very small gap is maintained between it and the upper surface of the gear wheel. Then use a tool to remove the upper end 14 of the lever 14.
b on the free end 13' of the extension 13b of the spring piece.

In addition to the claws 2b on the outer periphery of the arc-shaped wall, the upper lid 12 may be fastened by snap-engaging with a claw plate 1d provided in an upright manner on the base plate.

For the rotary damper assembled in this way, the mounting board can be fixed to the cassette lid side and the teeth of the gear ring can be meshed with the gears of the main body, or conversely, the mounting board can be fixed to the main body side and the teeth of the gear ring can be meshed with the gears of the main body. It may be meshed with the gear on the lid or the sector gear, but in any case, when the cassette lid is pushed closed by hand, the rotation of the gear causes the mainspring 7 to be wound from the inner end that is fastened to the shaft of the gear. I will make it possible for you to do so.

As a result, when the open cassette lid is manually pushed and closed, the mainspring is wound up, and the lever downward end 14a moves toward the inner end in the spiral groove 4, so the lever 14 uses the shaft 14' as a fulcrum. arrow a
(Fig. 1), the extension part 13b of the spring piece deforms as shown by the arrow b (Fig. 1), and at the same time enters the non-circular hole 1a of the board and becomes the non-rotating damper shaft 10'. The inner surface of the recess 8 of the tooth wheel facing the fixed brake disk 10 and the seal disk 11 fixed to the tooth wheel rotate in contact with the oil, so the rotation of the tooth wheel is always braked and the seaming is prevented. The spring, which gradually increases its resistance to rotation, prevents the cassette lid from being closed suddenly or violently.

Immediately before the position where the cassette lid is closed, the end 14a of the lever 14 touches the heart island 5 at the inner end of the spiral groove 4.
It reaches around . As shown in Fig. 5, around Heart Island there is an outgoing path 4a, which is an extension of the spiral groove 4 that gradually becomes shallower along one side of Heart Island, and a shorter path that curves from the shallowest end 4a' of the outgoing path 4a. The slightly deeper terminal end 4b of the dead end extending in this manner and the entrance 4 of the terminal end 4b
Heart notch 5' adjacent to b' and on heart island
a stop part 4c that is slightly deeper than the terminal end part 4b and surrounded by a half circumference, and an escape part 4d to the other side of the heart island that is adjacent to the stop part 4c and is deeper than the stop part.
A return path 4 that gradually becomes shallower from the escape section 4d along the other side of Heart Island and reconnects with the spiral groove at the shallowest end 4e'.
A one-way circulation path consisting of e.

Therefore, the downward end 14a of the lever that has reached the inner end of the spiral groove cannot enter the return path connected to the spiral groove at the shallowest end 14e'. with the subsequent rotation of the toothed wheel, then enters the terminal end 4b and eventually stops. In this state, the cassette lid is set so that it is slightly past the closing position, so the operator who closes the cassette lid knows by feel that the end 14a of the lever has abutted against the end of the end. , releasing the pushing force. Then, the mainspring, which has accumulated power due to the winding, tries to unwind and moves the downward end 14a of the lever backward in the terminal end. As mentioned above, the terminal end is bent with respect to the shallowest end of the forward path, and since the terminal end is deeper than the shallowest end of the forward path, the downward end 14a of the reversed lever cannot go to the forward path and ends at the end. The mainspring drops into a slightly deeper stop 4c adjacent to the entrance of the section, and the notch 5' of the heart island absorbs the force of the mainspring to unwind, preventing it from unwinding.

In other words, if you push the cassette lid a little past the closing position, and then release your hand when you feel a click and can no longer push it any further, the mainspring will unwind slightly and return the cassette lid to the closing position. , and maintain the cassette lid in that position.

To open it, push the closed cassette lid slightly again. As a result, the end 14a of the lever is in the stop part deeper than the end part and cannot return to the end part due to the step at the bottom, so it falls into the escape part 4d deeper than the stop part. Then, when you release your hand, the end of the lever moves back from the escape part by the unwinding force of the mainspring, exits into the spiral groove, and moves backward in the groove to the outer end, during which time the gear wheel 3 is reversed and the cassette cover is opened. . Of course, since the rotation of the gear wheel for opening the cassette lid is braked by oil, the cassette lid opens quietly.

In this way, in this embodiment, when the cassette lid is pushed in until it passes a little past the closing position and then released, the mainspring unwinds slightly and the downward end of the lever 14, which is the locking member, is pushed into the inner end of the spiral groove. The cassette lid is locked in the stop part 4c, and then the closed cassette lid is pushed in a little to remove the locking member from the stop part 4c and moved to the escape part 4d, while braking the cassette lid with the restoring force of the mainspring. It can be opened.

However, the present invention is not limited to this. For example, as in the embodiment shown below, the locking member that locks the locking member when the cassette lid is closed may be operated directly with a finger, or a link mechanism or the like may be used. The locking member may be removed by operating the operating device to open the cassette lid.

In FIGS. 6 to 8, 21 is a mounting board having fixing means 21', 22 is a gear ring, and 23 is an upper cover that rotatably sandwiches the gear ring between the board and is fixed to the board by snap engagement. The base plate, gear ring, and top cover are each made of plastic.

The mounting board has a semicircular part 21a having a substantially same diameter as the gear on which the gear 22 is mounted, and a projecting part 21b extending from the outer periphery of the semicircular part,
The center of the semicircular portion 21a has a non-circular hole 21a' into which a non-circular protrusion 10b protruding from the lower end of the damper shaft 10' of the damper is fitted, similar to the substrate 1 described above.

The gear ring 22 has teeth 22' on the upper half of its outer periphery, and has a recess 24' open to the upper surface by the inner sole 24 and a recess (not shown) open to the lower surface inside. A projection that rotatably enters the recess 10a at the upper end of the damper shaft 10' projects downward from the center of the recess. Also in this embodiment, the damper shaft 10'
A brake disc 10 whose upper end is coated with oil is mounted non-rotatably, and a seal disc 11 whose upper surface is coated with oil is rotatably fitted under it, and the peripheral edge of the seal disc 11 is swaged to the outer periphery of the recess. fixed,
During assembly, the non-circular protrusion 10b is fitted into the non-circular hole 21a' in the base plate so that rotation of the toothed wheel in either direction is braked by oil.

A mainspring 26 is housed in a recess 24' above the toothed wheel, and a protrusion 26a provided at the outer end of the mainspring is fixed in a groove 24a formed on the inner periphery of the recess. A plurality of grooves 24a are formed in the circumferential direction as shown in the figure, and a plurality of grooves 24a are formed in the circumferential direction.
It is preferable to select the groove in which the spring is fastened so that the force utilized by the mainspring can be adjusted as desired. Note that the upper recess 24' is slightly deeper than the height of the mainspring 26.

The mounting board 21 has a 1/4 arc-shaped wall 27 that surrounds the outside of the gear ring 22 and is slightly higher than the gear ring.
It has along the half circumference of 1a, and receives the upper lid 23 thereon. The upper cover 23 has a cover part 23a that is received by the arcuate wall 27 and covers the upper surface of the tooth wheel, and an overhang part 23b that extends from the cover part 23a and covers the overhang part 21b of the board. A shaft 28 with a cutout 28' for holding the inner end 26b of the mainspring 26 protrudes from the center of the lower surface. The edges of the lid part 23a and the overhanging part 23b have legs 23a' and 23b' that are snapped onto the outer surface of the arcuate wall 27 and claws 27' and 21b' provided on the edge of the overhanging part 21b. So,
When each leg is aligned with the claw and the upper cover is pushed down, the upper cover is fixed to the base plate by sandwiching the gear ring between the base plates. tooth ring 2
A finite groove 29 is formed on the outer periphery of the lower half of the groove 29 in a spiral shape, and has both ends of approximately 2 turns in this embodiment, and a developed view of the groove 29 is shown in FIG. Then, the shaft 30 stands up on the overhanging portion 21b of the mounting board, and the shaft 30
A claw plate 31 acting as a locking member is rotatably fitted in the holder, and the claw plate 31 is pulled by a spring 32 wound around the shaft 30, so that the tip 31a enters the groove 29, and the other end 31b is extended. It is made to protrude outside the portion 21b. The tip 31a of this claw plate is positioned at one end 29a of the groove 29 when the cassette lid is open.
A protrusion 29' is provided inside the protrusion 9 at a position slightly closer to one end than the other end 29b. The tip of the protrusion 29' is the eighth
As shown in the figure, it is positioned inside the groove 29.

In this embodiment as well, when the open cassette lid is closed, the toothed ring 22 is rotated in one direction, whereby the mainspring 26 is wound from the outer end side in this embodiment. The rotation of the toothed ring 22 is braked by the damper 9, and as the cassette lid is closed, the mainspring 26 is tightened, thereby preventing the cassette lid from being closed suddenly or violently. Then, while closing the cassette lid, the tip 3 of the claw plate 31
1a slides into contact with the bottom of the finite groove under the bias of the spring 32.

Just before the cassette lid closes, the tip of the nail plate 31a
is located on the protrusion 29' on the other end side of the groove 29, and when the cassette lid is closed, the claw plate is pushed by the protrusion 29', rotates against the spring 32, passes over the protrusion 29', and the claw plate passes through the protrusion 29'. The tip portion 31a is the other end portion 2 of the finite groove.
Located at 9b. As a result, the tip of the pawl plate comes into contact with the other end of the finite groove, making it impossible for the gear to rotate any further.When you stop pushing in the cassette lid and release it when you feel a firm contact, the mainspring opens. 26 tries to open the cassette lid by reversing the gear wheel by the restoring force, but the cassette lid remains closed because the tip of the pawl plate engages the protrusion 29'.

To open the cassette lid, the other end 31b of the claw plate is operated either directly or indirectly through a mechanism that is linked by pressing a push button, etc., and rotated against the spring 32 to open the tip 31a. from the protrusion 29'. Then, due to the restoring force of the mainspring, the gear wheel 22 is reversed, and the tip of the pawl plate returns to one end 29a of the finite groove again. Of course, since the reverse rotation of the gear 22 is also damped by the damper 9, the cassette lid opens quietly.

As mentioned above, the tip of the protrusion 29' is inside the finite groove 29, so just before the cassette lid is closed, the tip of the claw plate climbs over the protrusion 29' and forms the other end of the groove 29.
b, or when pivoting the nail plate against the spring 32 to open the closed cassette lid, the tip of the nail plate does not have to come out of the groove 29. There will be no accidents where the parts come out of the grooves and become disengaged from the grooves, resulting in breakdowns. Note that the spring 32 is wound around the shaft 30, and one end of the spring 32 is connected to the step 21 formed in the projecting portion 21b.
b'', and the other end is hung on a bent part 31' provided on the pawl plate. You can tow it as you like.

Thus, according to the present invention, the lengths of the spiral grooves 4 and the finite grooves 29 are appropriately determined depending on the amount of rotation of the gear wheel to close an open cassette lid.
When the gear rotates in either the opening or closing direction, a damper brakes the rotation, and a mainspring or coil spring that is wound in one direction is locked in a wound state with a locking member, such as a cassette lid. It is possible to provide a rotary damper that can maintain the cassette lid in a closed state and release the lock to open the closed cassette lid. Therefore, the damper of the present invention eliminates all of the conventional dampers that brake only rotation, the spring that pulls the cassette lid to the open position, and the lock mechanism that locks it to the closed position, which were required to be installed separately. Because it is compactly integrated into one,
It does not take up much space on the equipment used, and can be installed simply and easily, greatly contributing to simplifying the assembly line and mass production.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention,
Figure 1 is a plan view, Figure 2 is a side view, Figure 3 is a
4 is an exploded perspective view, FIG. 5 is an enlarged plan view of the gear ring, and FIGS. 6 to 8 show another embodiment. 7 is an exploded view of the lower outer periphery of the tooth ring, and FIG. 8 is a partial plan view. In the figure, 1 and 21 are mounting boards, 3 and 22 are tooth rings, 7, 29 is the mainspring, 12 and 23 are the upper lid, 9 is the damper, 14 and 3
1 shows a lever and a pawl plate which are locking members.

Claims (1)

[Claims] 1. A mounting board attached to either the main body of the device used or a reciprocating body attached to the main body, and a mounting board rotatably supported on the mounting board,
A tooth ring that rotates forward and backward in conjunction with the movement of the reciprocating body; and an upper cover that covers the tooth ring from above and is fixed to the mounting board, and forms a housing case for the tooth ring together with the mounting board. and a spring which is arranged between the upper cover and the tooth ring, has one end fixed to the accommodation case and the other end to the tooth ring, and is tightened to store restoring force when the tooth wheel rotates in one direction. , a damper fixed to the mounting board and disposed between the gear and braking the forward and reverse rotation of the gear; a groove provided in the gear; and a damper attached to the mounting board and disposed at a tip. plunges into the housing case, and as the gear rotates forward and backward, the tip traces the inside of the groove of the gear, thereby tightening the spring while tightening the gear that has rotated in one direction. A releasable locking device comprising a locking member that locks against restoring force to prevent the gear from rotating in the other direction and also releases the lock of the gear. Rotating damper with. 2. In the rotary damper according to claim 1, the groove provided in the tooth ring is a spiral groove formed on the upper surface of the tooth ring, and the inner end of the spiral groove has a groove around the heart island. A rotary damper that has a one-way circulation path that goes around the area and has a stop part that locks the tip of the locking member. 3 In the rotary damper according to claim 1, the groove provided in the tooth ring is a finite groove formed at one end and the other end formed on the outer periphery of the tooth ring, and the finite groove is formed at the other end. A rotary damper that locks the tip of the locking member.