JP4575336B2 - Shock absorber using rotary damper - Google Patents

Description

  The present invention relates to a shock absorber using a rotary damper for slowly lowering a tilting member such as a keyboard lid pivotably supported on a main body (base) side of a piano or the like from a standing position to a receiving surface on the base side. About.

For example, there is a piano keyboard lid or other lid member provided with a braking device that applies a braking force to the rotational force so that it does not drop suddenly when rotating in the closing direction. In order to restore the brake device to its original position, a spring or the like is used as a return means (see, for example, Patent Documents 1 to 5).
JP-A-9-126265 JP-A-8-211861 JP 9-329173 A JP 2000-187480 A JP-A-9-146534

In any of the conventional techniques, as the above-described return spring, a leaf spring, a torsion type coil spring, a tension type coil spring, or a combined type is used. However, the leaf springs, torsion type coil springs, and tension type coil springs are all easily damaged by repeated use over a long period of time, and there is a problem in durability.
That is, if it is a leaf | plate spring, repeated deformation | transformation operation | movement will be added to the substantially same part of a leaf | plate spring by repeated use over a long term, this will be broken by material fatigue, and there exists a problem in durability. Further, in the case of a torsion type coil spring, it is necessary to always form an engaging portion at the tip portion, and this deformation portion is intensively subjected to repeated deformation, and this portion is caused by material fatigue. Will break, and there is a problem with durability. Furthermore, in the case of a tension type coil spring, it is necessary to form an engaging part such as a hook at the tip, as in the case of a torsion type coil spring. The operation is added, and this portion is broken due to material fatigue, which causes a problem in durability.

There is a reason for using such plate springs, torsion type coil springs, and tension type coil springs. That is,
(1) When a braking function is configured in the rotating shaft portion, a rotating damper is employed, and naturally a torsion type coil spring is also employed as a return spring. In this case, there is no room for adoption other than torsion type coil springs.
(2) In the case of a system in which the arm rotates, a spring or the like cannot be arranged on the inner part where the arm rotates. This is because it interferes with the rotation of the arm. When a spring or the like is arranged on the outer portion where the arm rotates, the back surface of the arm extends in the process of the arm falling down, so that naturally, a tension type coil spring or a leaf spring is adopted.
In any case, in a shock absorber using a conventional rotary damper, a leaf spring, a torsion type coil spring or a tension type coil spring has to be adopted.
The main object of the present invention is to improve the durability by adopting a compression type coil spring in a shock absorber using a rotary damper so that a compression type coil spring can be adopted.

In order to achieve the above object, the present invention provides a shock absorber using a rotary damper that acts on a swinging operation of a member such as a lid that is pivotally supported on the base side. An arm that has a cylindrical portion along one side and is rotatably supported on the connecting plate, a slider that is slidably fitted to the cylindrical portion of the arm, and a space between the slider and the connecting plate. A link that connects the swinging motion of the arm with the connecting plate as a fulcrum and the linear motion along the cylindrical portion of the slider so as to be linked to each other; In a swinging motion using a compression type coil spring disposed in the cylindrical portion so as to be compressed by movement in one direction along the cylindrical portion of the slider and the connecting plate of the arm as a fulcrum. A rotary damper for applying power, the casing of the rotary damper is fixed to the connecting plate, the rotary member of the rotary damper is connected to one side of the arm, and the elastic force of the compression type coil spring Acting on the arm in a predetermined swinging direction with respect to the arm via the slider and the link, and formed on one of the spring receiving surface formed on the slider and the cylindrical portion of the arm The compression coil spring is disposed between a spring receiving surface , one of the links is rotatably connected to a slider slidably fitted to the cylindrical portion of the arm, and the other of the links is The connecting plate is rotatably supported on the connecting plate, and the connecting plate is attached to the base side or provided integrally with the base .
Further, according to the present invention, when the rotary damper is rotated in one direction of either one of the casing and a relative rotating member that is rotatable relative to the casing, the generated torque is large and rotates to the opposite side. In this case, the generated torque is reduced.

  According to the present invention, in a shock absorber using a rotary damper, a compression type coil spring can be adopted by using a link mechanism, and the use of the compression type coil spring improves durability. be able to.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
In the figure, reference numeral 48 denotes a rotary damper, and a connecting plate 52 is integrally formed with a casing 50. One of the arms 2 arranged at right angles to the rotating member 54 protruding from the casing 50 of the rotary damper 48 is fixed by a set screw 56 so as not to rotate. The basic structure inside the rotary damper 48 is the same as or similar to that described in FIG. 7 of JP-A-9-126265 and other patent publications, and detailed description thereof is omitted. Further, the rotary damper 48 may be configured such that the rotating member 54 side is fixed or integrally formed with the connecting plate 52 and the casing 50 side is fixed to the arm 2. Further, the connecting plate 52 may be configured to be fixed to the casing 50 as a separate body.

When the arm 2 swings counterclockwise from the standing state shown in FIG. 7, the rotary damper 48 generates a high torque, and a large braking force acts on the swing of the arm 2. On the other hand, the rotary damper 48 is configured such that when the arm 2 swings clockwise in FIG. 1, a low torque is generated and the rotating member 54 rotates with a small resistance. A roller 4 is rotatably supported at the tip of the arm 2. A slider 58 is slidably fitted to the cylindrical portion 2a of the arm 2 along the cylindrical portion 2a, and a spring receiving surface 60 formed on the outer peripheral portion of the slider 58 and the cylindrical portion 2a. The compression coil spring 30 is disposed between the spring receiving surface 62 formed on one bottom surface. One bottom surface of the cylindrical portion 2 a needs to be in a position where the arm 2 is raised by the elastic force of the compression coil spring 30.

Shaft-shaped spring guides 64 and 66 are formed at the bottom of the slider 58 and the cylindrical portion 2 a, and the coil spring 30 is fitted into the spring guides 64 and 66. One of the rectangular links 22 is rotatably connected to the groove portion of the slider 58 by a shaft body 31, and the other of the links 22 is located obliquely lower left in FIG. 16 from the center of rotation of the arm 2. Thus, the shaft body 24 is rotatably supported on the convex portion 52 a of the connecting plate 52.

The link 22 constitutes a motion connecting link mechanism that interlocks the swing motion of the arm 2 and the linear slide motion of the slider 58 along the cylindrical portion 2a. As shown in FIG. 8, the rotary damper 48 is embedded in the arm 46 through a hole formed in the side wall of the arm 46 on the main body (base) side of the piano 32, and the connecting plate 52 is screwed to the arm The roller 4 at the tip of the arm 2 is fixed to the side surface 46 and is in contact with the back surface 34 a of the keyboard lid 34.

  In the above-described configuration, when the keyboard lid 34 is lowered from the standing open position in the closing direction, a large braking force is applied from the rotary damper 48 to the falling movement due to the weight of the keyboard lid 34, and the keyboard lid 34 is By this braking force, it slowly lands on the lid receiving surface 38. On the other hand, when the keyboard lid 34 is lifted and returned to the standing open position, the arm 2 follows the rise of the keyboard lid 34 by the elastic force of the compression coil spring 30 built in the arm 2, and the standing return direction. And the roller 4 at the tip is urged in a direction in which the roller 4 abuts against the back surface 34 a of the keyboard lid 34.

It is sectional drawing of the shock absorber using the rotary damper which shows embodiment of this invention. It is AA sectional view. It is a BB sectional view. It is a bottom view of a shock absorber using a rotary damper. It is an external view of the shock absorber using a rotary damper. It is an external view of the shock absorber using a rotary damper. It is a side view of the state where the shock absorber using a rotary damper was attached to the lid. It is an external view of the state which attached the buffering device using a rotary damper to the lid | cover.

Explanation of symbols

2 Arm 2a Tubular part 4 Roller 22 Link 24 Shaft body 30 Coil spring 32 Piano 34 Keyboard cover 36 Time signature 38 Receiving surface 46 Arm 48 Rotary damper 50 Casing 52 Connection plate 54 Rotating member 56 Set screw 58 Slider 60 Spring receiving surface 62 Spring receiving surface 64 Spring guide 66 Spring guide

Claims (2)

A shock absorber using a rotary damper that acts on a swinging motion of a member such as a lid pivotably supported on the base side, and has a connecting plate and a cylindrical portion along the longitudinal direction. An arm rotatably supported by the connection plate; a slider slidably fitted to a cylindrical portion of the arm; and the connection plate of the arm disposed between the slider and the connection plate. A link connecting the swinging motion about the slider and the linear motion along the cylindrical portion of the slider so as to interlock with each other, and a link along the cylindrical portion of the slider accompanying the swinging of the arm. A compression-type coil spring disposed in the cylindrical portion so as to be compressed by movement in a direction, and a rotary damper that applies a braking force to a swinging motion with the connecting plate of the arm as a fulcrum A casing of the rotary damper is fixed to the connecting plate, the rotary member of the rotary damper is connected to one side of the arm, and the elastic force of the compression type coil spring is connected to the slider and the link. Acting between the spring receiving surface formed on the slider and the spring receiving surface formed on one of the cylindrical portions of the arm. The compression type coil spring is arranged, one of the links is rotatably connected to a slider slidably fitted to the cylindrical portion of the arm, and the other of the links is rotatably connected to the connecting plate. A shock absorber using a rotary damper , wherein the connecting plate is attached to the base side or provided integrally with the base . Torque generated when one of the casing and the relative rotating member that is rotatable relative to the casing is rotated in one direction is large, and generated when the rotary damper is rotated in the opposite direction. The shock absorber using the rotary damper according to claim 1, wherein:

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