JP3486318B2 - Soft closing damper mechanism - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a polymer viscous fluid such as polyisobutine, other viscous fluids, and a spring, and utilizes the viscous shear resistance and the spring force, respectively. To obtain a resistance force, the resistance force exerts a buffering action against a load torque by the door or the like when the door or the like rotates in one direction, that is, exerts a braking force, and the other direction is opposite. The present invention relates to a damper mechanism that can be used in various applications in which the door or the like can be rotated with a small force by the spring effect at the time of the rotation operation of. 2. Description of the Related Art Conventionally, in this kind of soft closing damper mechanism, the structure of a damper chamber is composed of a casing,
It comprises a movable shaft fitted and disposed rotatably in the casing, and a bearing for rotatably supporting the movable shaft in the casing. That is, in the above-mentioned conventional soft closing damper mechanism, because of assembling the components, the movable shaft is provided with a small-diameter shaft hole at one axial end in the casing and penetrating through the center of the end wall. The small-diameter portion formed on one end side is liquid-tightly fitted so as to be rotatable via an O-ring, and further,
The movable valve is fitted on the outer peripheral wall of the large diameter portion or the inner wall surface of the casing of the movable shaft so that the movable valve can be opened and closed. Further, after filling the viscous fluid into each of the compartments in which the inside of the casing is divided into two in the circumferential direction by the movable valve, a lid is liquid-tightly attached to the opening at the other end in the axial direction of the casing. The bearing is fixed in a state, and a bearing is fitted and fixed in a liquid-tight state in a shaft hole penetrating through the lid, and the other end of the movable shaft is rotatably supported on the bearing. [0004] However, since the movable shaft and the bearing are separate members as described above, there is a disadvantage that the number of components increases and assembly takes time. In order to solve the problem, it is naturally considered to integrate the movable shaft and the bearing in order to simplify the structure. However, when adopting such an integrated configuration, the viscous fluid flowing into the damper chamber is required during assembly. Can no longer be injected. The present invention has been made in view of the above-mentioned problems of the conventional soft closing damper mechanism, and even when the movable shaft and the bearing are integrated, a viscous fluid can be injected into the damper chamber upon assembly. The soft closing damper mechanism, in which the damper force is in the middle of rotation and can be changed appropriately in a timely manner, can be provided with a simple configuration.
That is the purpose. According to the present invention, in order to achieve the above object, a casing and a bearing portion are provided so as to protrude therearound, and a pair of blades are provided adjacent to the bearing portion in the axial direction. A movable portion having a substantially cylindrical shape, which is protruded at a symmetrical position, and which is fitted and disposed so as to be rotatable in the casing; A movable valve and a protruding portion, or a pair of movable valves or a pair, which are disposed at opposing positions on the inner peripheral wall surface of the casing so as to be slidable, and are arranged so as to be movable to a closed state and an open state respectively. And a damper chamber formed between the movable valve and the projecting portion between the casing and the outer peripheral wall surface of the movable shaft is filled with a viscous fluid filled and sealed in two circumferentially partitioned chambers. And in the movable shaft, A spring disposed in a state where each end is hooked to the casing side and the movable shaft side, and a notch opening communicating with the compartment is provided in a bearing portion of the movable shaft. By providing a section and closing the outflow of the viscous fluid, the relative rotation of the movable shaft in the damper chamber allows the communication between the compartments and the cutout openings to be freely opened and closed. It is intended to provide a soft closing damper mechanism in which a gap is formed. The present invention intends to exert the following effects by the above configuration. That is, when the external force is applied as a rotating force to the movable shaft, the movable shaft is rotated. However, when the movable shaft is rotated in one direction, the damper chamber filled with the viscous fluid is rotated. , By the pressing force on the viscous fluid in one compartment,
In the case of the projecting portion, it is of course immovable and closed, but when the movable valve is adopted, it is pushed and fluctuated inward, thereby contacting the outer peripheral wall surface of the movable shaft. The movable valve is closed. In any case, however, the viscous fluid in the two compartments is notched through the notch opening formed in the bearing of the movable shaft until the movable shaft is rotated by a predetermined angle from its maximum rotation angle. Respectively, and the viscous fluid in the two compartments flows into the variable gap formed in the damper chamber by the two cutout openings. Within the predetermined rotation angle range of the opened movable shaft, a large damper effect is not exerted against a rotation external force applied to the movable shaft. That is, when the flap door is mounted so as to be in a horizontal closed position at 0 ° and an open position in an upright position at 120 °, the movable shaft has a maximum rotation angle of 120 ° to 90 ° at which it becomes an upright state. Since the damper force is set to a small value up to the rotation angle as described above, the door closing operation can be performed by a light manual force. Further, when the door is turned from 90 ° to 60 °, the notch opening provided in the bearing portion of the movable shaft gradually turns and shifts in the circumferential direction with respect to the two compartments, thereby By the rotation of the shaft, the variable gap communicating with each of the compartments of the damper chamber is closed by the time the pivot angle of the door becomes 60 °, whereby the variable fluid into which the viscous fluid of each of the compartments has flowed. Since the gap is gradually reduced to an absent state, the viscous fluid in each compartment becomes full due to the rotational displacement of the movable shaft by the two blades, and a large resistance force based on the viscous fluid is generated. Thus, a sufficient damper effect is exerted against the external force of the movable shaft. Therefore, the door receives a necessary damper force in the rotation angle range from 60 ° to 0 °, and the door or the like can be softly closed. Further, when the door is turned in the closing direction as described above, the spring is screwed in the winding direction, and this screwing resistance acts on the movable shaft. The restoring force of the spring facilitates the door opening operation, and when the movable valve is adopted when the door is closed or the like, the movable valve is opened. The fluid easily flows into the other compartment, and the damping force becomes smaller, so that the door opening operation or the like can be easily performed. Further, when assembling the soft closing damper mechanism, when a movable valve is used on the inner peripheral wall surface of the casing, the movable shaft is mounted in advance in a state where the movable valve is mounted.
Inserted into the casing from the small diameter side of the tip, through an O-ring to a shaft hole penetrating the tip wall of the casing,
The small diameter portion is inserted so as to be rotatable in a liquid-tight state.
Then, by the relative rotation of the movable shaft with respect to the casing, the compartments and the cutout openings provided in the bearing portion of the movable shaft are made to coincide with each other in the above-mentioned 120 ° state of the door or the like, so that the variable gap is reduced. In this state, the viscous fluid can be injected into each of the compartments from the rear end opening side of the casing through each of the variable gaps in this state. After the injection of the viscous fluid, the two cutout openings are brought into a liquid-tight state from the rear by means such as press-fitting an O-ring between the rear outer peripheral surface of the bearing portion of the movable shaft and the inner peripheral wall surface of the casing. If the spring is inserted into the movable shaft after closing, the spring receiver is fitted from the rear end in the casing, and the cover nut is screwed in to fix the spring receiver to complete the assembling operation. Of course, each end of the spring is a movable shaft and a spring receiver,
Each of them is arranged in a hung state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional front view, and FIGS. 2 to 6 are views taken along line AA in FIG. FIG. 7 is an exploded perspective view in each operation state of FIG.
In the drawings, 1 is a casing, 2 is a movable shaft, 3 is a spring, 4 is a spring receiver, and 5 is a cover nut. The casing 1 has a substantially horizontally long cylindrical shape.
A shaft hole 1b is provided at the center of the tip wall 1a.
The inner diameter of the cover nut 5 is smaller than the inner diameter of the cover nut 5 and is provided in the axial direction.
Is screwed into the female screw portion 1c. Further, in the case of the embodiment shown in FIG.
-Shaped shaft mounted valve seat 1e and outer peripheral wall surface 2f of movable shaft 2
Is slidably in contact with the projecting portion 1f, and is protruded in the axial direction by a required length.
A separately prepared pin-shaped movable valve 6 is fitted so as to be movable in the diameter direction. In the above-described embodiment, the movable valve 6 and the protruding portion 1f are opposed to each other as a pair. However, at this time, the movable valve 6 may be provided to oppose without providing the protruding portion 1f if necessary. Also, without using the movable valve 6, the projecting portion 1
f may be provided opposite to each other. Of course, when the movable valve 6 is adopted, the resistance in the rotation direction of the movable shaft is smaller than when the protruding portion 1f is adopted. Become. The movable shaft 2 has a small-diameter portion 2a at the distal end and a bearing portion 2 having a diameter slightly larger than the small-diameter portion 2a on the rear side.
b is provided continuously, and a large-diameter portion 2c is provided on the rear side thereof. The large-diameter portion 2c is located symmetrically with respect to the outer peripheral wall surface 2f of the large-diameter portion 2c, and is located with respect to the inner peripheral wall surface 1d of the casing 1. Two blade portions 2d and 2e that can be slidably contact with each other are protruded. The movable shaft 2 has an outer peripheral wall 2.
f, a bearing portion 2g protruding outward from the rear side and slidingly contacting the inner peripheral wall surface 1d of the casing 1 is provided with the blade portions 2d, 2d.
e is continuously and integrally provided from the rear end. As shown in FIG. 1, the movable shaft 2 having the above-mentioned structure is first fitted with an O-ring 7 into an annular concave portion 2h recessed on the outer periphery of the support portion 2b. Inserting from the rear end opening toward the inside of the casing 1 from the side, and then the bearing 2b is fitted into the shaft hole 1b so as to be rotatable in a liquid-tight state. In this way, the inner wall surface 1d of the casing 1, the outer wall surface 2f of the movable shaft 2 and the bearing 2g allow the movable valve 6 and the protruding portion 1f to move relative to each other as described above. The damper chamber 8 divided into two compartments 8a and 8b in the circumferential direction by a pair of movable valves 6 provided facing each other or a pair of projecting portions is formed, and in the compartments 8a and 8b. The blades 2d and 2e projecting from the outer peripheral wall 2f are
It is arranged so as to be rotatable in the circumferential direction while contacting the inner peripheral wall surface 1d of the casing 1. Further, in the illustrated example, the movable shaft 2 is
Between the maximum rotation angle of 120 ° shown in FIG. 3 and the rotation angle of 90 ° shown in FIG. 3 so as to maintain the communication with the compartments 8a and 8b, respectively.
g, the notched openings 9, 1 so that the viscous fluid a can be injected into the compartments 8a, 8b during assembly.
0 is not provided, so that the compartments 8a, 8b
Are provided with variable gaps b and c for adjusting the damper force in accordance with the change of the rotation angle, as will be described in detail later. At the time of the assembling, after the viscous fluid a is injected into the compartments 8a and 8b from the notched openings 9 and 10 as described above, as shown in FIG.
An O-ring 11 is press-fitted between the rear portion of the bearing portion 2g and the inner peripheral wall surface 1d of the casing 1, and a spring 3 is inserted into the movable shaft 2 so that one end 3
a with the other end 3b of the spring 3 hooked to the rear part of the casing 1, the spring receiver 4 is fitted, and then the cover nut 5 is attached to the rear end of the casing 1. And the spring receiver 4 is fixed in the casing 1 to complete the assembly. FIG. 8 shows a state in which the soft closing damper mechanism according to the present invention is used for the toilet seat 12, the casing 1 of which is fixed to the toilet body 13, and the movable shaft 2 is connected to the toilet seat 1.
By fixing to the base end of the toilet seat 2, the toilet seat 12 is pivotally connected to the toilet body 13 so as to be openable and closable. The toilet seat 12 thus attached to the toilet body 13 is moved to the closed position shown in FIG.
By opening upward from the E position which is °,
The movable shaft 2 is rotated in the direction of arrow d from the position shown in FIG. 6 with respect to the casing 1 fixed to the toilet body 13.
In other words, in FIG. 8, the movable valve 6 is sequentially rotated from the position E to the positions d, c, and b, so that the movable valve 6 fluctuates from the position shown to the lower right and enters the valve-opening operation state. The viscous fluid a in the chamber 8a quickly flows into the compartment 8b, so that no damping force acts on the viscous fluid a.
Can be opened by the restoring force of the spring 3 until the illustrated maximum rotation angle, that is, the opening a position is reached. However, from the position C of FIG. 8 shown in FIG.
The variable gaps b and c that are in communication with the compartments 8a and 8b are gradually expanded, and at an opening angle of 90 °, the variable gaps b and c are opened considerably as shown in FIG. At the opening position a, the state is the maximum opening movement state. Therefore, the toilet seat 12 can be rotated with a lighter force than before until the toilet seat 12 reaches the position A after the position B shown in FIG. Next, when the toilet seat 12 is in the open position of the toilet seat 12 and a force in the closing direction is applied to the toilet seat 12, as described above, the positions from the illustrated position A to the position B are shown in FIGS.
As shown in the figure, the variable gaps b and c are open, and the variable gaps b and c are closed in the middle of the position B and the position C. Therefore, the variable gaps b and c are closed in the middle of the position A to the position B and the position C. Until the viscous fluid a in the compartments 8a, 8b
Therefore, the damper force acts weakly. From the position immediately before the position C to the position D and the position E, as shown in FIGS. 4, 5 and 6, the variable gap b,
Since c is completely closed, the damper force becomes the maximum strength, and the valve seat 12 is slowly closed from the position before the position C to the position E in FIG. 8 to realize the soft closing operation. Since the present invention is constructed as described above, a variable gap communicating with the damper chamber is formed in the movable shaft by a notch opening formed in the bearing portion of the movable shaft. The variable gap is in an open state until the movable shaft is rotated by a predetermined rotation angle from its maximum rotation angle, so that the viscous fluid in the damper chamber is notched by the rotation of the movable shaft. The variable gap is closed by being rotated by a predetermined rotation angle or more, and there is no storage of the viscous fluid.
A region where the damper force is weak is set near the maximum rotation angle of the movable shaft, and a region where the damper force is strong is set in the other rotation angle range. Since the variable gap is gradually closed as the shaft rotates, a damper force adjusting function equivalent to a conventional orifice is obtained, and therefore, the soft closing damper mechanism according to the present invention is used for, for example, a flap door or the like. Then, the initial door closing operation can be performed lightly, and thereafter the door can be slowly closed by the load torque of the door. Further, in the state where the gap is open, the notch opening of the bearing portion can be used as an inlet for the viscous fluid into the damper chamber, and the movable shaft and the bearing portion are integrally formed. The need for a separate bearing, other components for assembling the bearing, and the like is eliminated, and consequently, a simple and inexpensive provision is possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional front view showing an embodiment of a soft closing damper mechanism according to the present invention. FIG. 2 is a transverse sectional view showing an operation state at 120 ° which is the maximum rotation angle of the movable shaft as viewed in the direction of arrows AA in FIG. FIG. 3 shows a movable shaft rotation angle 9 at the same cutting position as in FIG.
It is the cross-sectional view which showed the operation state in 0 degree. FIG. 4 is a movable shaft rotation angle 6 at the same cutting position as in FIG.
It is the cross-sectional view which showed the operation state of 0 degree. FIG. 5 shows a movable shaft rotation angle 3 at the same cutting position as in FIG.
It is the cross-sectional view which showed the operation state of 0 degree. 6 is a movable shaft rotation angle 0 at the same cutting position as in FIG.
FIG. 6 is a transverse sectional view showing an operating state of °. FIG. 7 is an exploded perspective view showing the soft closing damper mechanism of the embodiment. FIG. 8 is an explanatory side view showing one usage example of the soft closing damper mechanism according to the present invention. [Description of Signs] 1 Casing 1d Inner peripheral wall surface 1f Projecting portion 2 Movable shaft 2d Blade 2e Blade 2f Outer peripheral wall 2g Bearing 3 Spring 3a Spring end 3b Spring end 6 Movable valve 8 Damper chamber 8a Partition Chamber 8b Partition chamber 9 Notch opening 10 Notch opening a Viscous fluid b Variable gap c Variable gap

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yojiro Nakayama 1-8-11 Higashikanda, Chiyoda-ku, Tokyo Within Sugatune Industry Co., Ltd. (72) Ryosuke Bandoh 1-8-11 Higashikanda, Chiyoda-ku, Tokyo (56) References JP-A-8-303514 (JP, A) JP-A-7-229531 (JP, A) JP-A-10-205568 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) E05F 3/14 F16F 9/14 A47K 13/12

Claims (1)

(57) [Claim 1] A casing and a bearing portion are protrudingly provided around the casing, and a pair of blade portions are protruded at symmetrical positions adjacent to the bearing portion in the axial direction. A substantially cylindrical movable shaft fitted and disposed rotatably in the casing, and an inner peripheral surface of the casing such that an outer peripheral wall surface thereof is slidable by relative rotation of the movable shaft with respect to the casing. A movable valve and a projecting portion, which are arranged to be movable to a closed state and an open state, respectively, at a position facing the wall surface, or a pair of movable valves or a pair of projecting portions, and these movable valves, A damper chamber formed between the casing and the outer peripheral wall surface of the movable shaft by the protruding portion is a viscous fluid filled and sealed in two compartments partitioned in the circumferential direction, Each end is located on the casing side and the movable shaft side, respectively. A spring disposed in a stopped state, and provided in the bearing portion of the movable shaft with respective cutout openings communicating with the compartments, and by closing outflow of the viscous fluid. A variable gap is formed in the damper chamber by the relative rotation of the movable shaft so that the communication between the compartments and the cutout openings can be freely opened and closed. Damper mechanism.