JP4859066B2 - Fluid damper - Google Patents

Description

  The present invention relates to a fluid damper.

Fluid dampers are used in various fields, and Patent Documents 1 and 2 listed below include examples of such liquid dampers. The former is used for a folding table. When the top plate is rotated between the horizontal use position and the vertical storage position, a rotation resistance is applied so that an impact is not generated at each rotation end. In the latter, it is used for door closers, and when opening the door, the resistance is reduced and lightly opened, but when closing, devise to increase the resistance so that it does not close shockingly and close slowly, The closed end is devised so that it can be reliably closed by reducing the resistance. Moreover, the fluid damper by this applicant before improving to this invention is disclosed by the following patent document 3. FIG.
JP 2004-135725 A JP 2003-193740 A JP 2007-46729 A

However, the fluid damper can be operated in various resistance changes by various structures according to the purpose. For example, in a cabinet to which a fluid damper is applied, even if the drawn drawer is pushed in vigorously, if the fluid damper starts to operate near the end of the drawer's storage, the drawer will first absorb the excessively strong momentum of the drawer. If it can be prevented from hitting the casing well, and the storage can be completed with a soft storage feeling, it becomes a cabinet with a higher-class feeling. As a fluid damper exhibiting such an action, there is a structure of the above-mentioned Patent Document 3. However, a fluid damper having a structure that can achieve a softer storage feeling than an alternative structure or a structure of Patent Document 3 is desired.
The problem to be solved by the present invention is to provide a fluid damper capable of softly receiving a sudden load with a structure different from the conventional one.

  In the first invention, the operating shaft moves back and forth along the longitudinal direction of the casing in the casing of the casing filled with fluid, and the inner diameter of the casing is the operation of the operating shaft along the longitudinal direction. A fixed position member is provided at a predetermined position of the operating shaft, and the fixed position member divides the casing chamber into two front and rear and communicates the two chambers. A small flow path is provided between the outer periphery of the fixed-position member and the inner surface of the casing as compared with the fixed-position member communication path, and the fixed-position member and a predetermined position behind the fixed-position member A movable member that can move back and forth on the operating shaft between the movable member, and the movable member has a convex portion that protrudes largest toward the fixed-position member in a facing region that faces the fixed-position member. The part has elasticity in the front-rear direction and is compressed An elastic member that can be restored, and even if the convex portion comes into contact with the fixed position member, the communication between the two chambers through the fixed position member communication path is not disabled, and the fixed position member is faced. The facing side region has a lower portion that is lower than the convex portion, and the low portion can be brought into contact with the fixed position member by the compression of the convex portion and is in contact with the fixed position member. The communication between the two chambers through the fixed position member communication path can be made impossible, and an elastic block is disposed in the chamber of the casing, and the elastic block can be contracted and restored by a fluid pressure. A fluid damper is provided.

The casing of the present application is not limited to a cylinder and may have a rectangular cross section. Accordingly, the fixed position member and the moving member are not limited to a circular shape, and include a shape such as a rectangular shape. Similarly, the diameter is expressed, but for a rectangle other than a circle, the separation distance from the operating shaft is expressed. In addition, the term “constant” here does not require strict mathematical meaning, but has a substantially constant meaning. However, it does not include a large variation in the diameter that results in a large gap δ (FIG. 7 described later) that eliminates the significance of fluid resistance as the small flow path. Specifically, when the casing is molded, there may be a slight taper in the drawing direction for die cutting, but this degree is constant described in the present application.
Examples of the elastic block include foaming urethane resin. In order to prevent the fluid from entering the inside, the holes inside the elastic block are not in communication with each other so that most of the holes open to the surface of the elastic block.

In the second invention, a biasing means for biasing the operating shaft of the first invention in the front side direction or the rear side direction is provided.
In a third aspect, the moving member according to the first aspect is formed of an elastic member that is more flexible than the fixed-position member as a whole, and the convex portion is located at the radial center near the operating shaft. It is located and the said low part is comprised so that it may be located in the outer side of radial direction rather than this convex part.
In a fourth aspect of the invention, the moving member of the second aspect of the invention is formed entirely of an elastic member that is more flexible than the fixed-position member, and the convex portion is on the radial center side near the operating shaft. It is located and the said low part is comprised so that it may be located in the outer side of radial direction rather than this convex part.

  In the fifth invention, the moving member formed by the elastic member of the fourth invention is provided at a position sandwiched between the fixed position member and formed by a member harder than the moving member. A receiving member having a radial dimension equal to or greater than that of the member is fixed to the operating shaft.

In the first invention, when a gentle external force is applied via the operating shaft, the moving member is pressed against the fixed position member by the fluid rising pressure according to the external force, but the protruding portion of the most protruding moving member is large. The lower part of the moving member remains separated from the home position member, not the pressure rise to the point of being crushed. Therefore, since the two chambers can communicate with each other via the fixed position member communication path, the resistance of the fluid damper is small.
On the other hand, when a sudden external force is applied via the operating shaft, the moving member is pressed against the fixed position member by the fluid rising pressure corresponding to the external force, and the convex portion is greatly crushed so that the lower part of the moving member is also positioned at the fixed position. Pressed against the member. Therefore, the communication through the fixed position member communication path becomes impossible, and the indoor fluid on the side where the pressure has risen suddenly flows only to the other chamber through the small flow path, so the resistance force of the fluid damper is large . That is, a sudden external force can be received. However, not only that, but the volume of the elastic block changes due to the rising pressure, so that it can be received with a soft feeling while relaxing the sudden external force.
In addition, the volume of the fluid in the casing needs to fluctuate due to the volume fluctuation of the working shaft entering and exiting the casing due to the entry and retraction of the working shaft. However, especially when the fluid is a liquid, the liquid itself absorbs the volume fluctuation. Is difficult, and the elastic block can absorb such volume fluctuations.

In the second invention, if the biasing means is provided, the operating shaft can be pushed back to the original position, so that the fluid damper can be used automatically and repeatedly.
In the third and fourth aspects of the invention, the moving member is formed entirely by a flexible member, so that the manufacture becomes easy.

  In the fifth aspect of the invention, the operating shaft can be pushed back to the original position by the urging means. At the time of pushing back, the moving member formed by the elastic member is pushed away from the home position member by the fluid pressure. Although it is deformed, it is received by the presence of a receiving member that is harder than the moving member and has a radial dimension equal to or greater than that of the moving member. The durability in case is improved.

  FIG. 1 is a side view of a furniture section equipped with one liquid damper 40 of a fluid damper according to the present invention similar to a piston / cylinder mechanism, and FIG. 2 is a view of the damper portion of the furniture shown in FIG. 3 is a longitudinal sectional view showing the entire structure when no external force is applied to the liquid damper used in FIG. 1, and FIG. 4 is a diagram in which the external force is suddenly applied. FIG. 5 is a diagram showing a state change from FIG. 4, FIG. 6 is a diagram showing a further change in state from FIG. 5, and FIG. 7 is an enlarged view of the main part of FIG. 8 is an enlarged view of the main part of FIG. 4, and FIG. 9 is an enlarged view of the main part of FIG.

The furniture 50 in FIG. 1 is, for example, a kitchen storage. A liquid damper 40 described below is housed and held in a holder 48 on the front side of the back surface of the top plate 50A. Reference numeral 50B denotes a side plate, and the liquid damper 40 has a function of absorbing a closing force and quietly closing the door when the single-open or double-open door 50C via the hinge is closed.
The structure of the liquid damper corresponds to a cylinder, and in this example, the indoor diameter dimension of the casing that defines the inner wall surface 10A of the casing 10 that is cylindrical is constant regardless of the position in the longitudinal direction within the operating range of the operating shaft 12. It is. In FIG. 3, the operating shaft 12 enters from the right side of the casing to the left, and can move forward and backward from the left to the right by the action of the coil spring 20 as the biasing means.

Oil as a working fluid is sealed in the casing 10, the member 28 is a seal member for preventing oil leakage due to the operation of the operation shaft 12, and the member 29 is a seal pressing member.
A rubber member 18 is attached to the outer end portion of the operating shaft as a portion that directly receives an impact force from the outside. A cylindrical fixed position member 22 whose outer peripheral surface is substantially close to the inner wall surface 10A of the casing 10 is attached to the inner end portion, and moves together with the operating shaft. It is integrated with this fixed position member, and a central shaft portion 12 ′ is formed so as to protrude on the side opposite to the operating shaft 12. The central shaft portion 12 'is also a part of the operating shaft (in a broad sense) referred to in this application.

  This fixed position member divides the chamber of the casing into two chambers, a left chamber A and a right chamber B, and is provided with a fixed position member communication passage 22H having a cross-sectional area and a number for sufficiently communicating the left chamber and the right chamber. Yes. For example, a receiving member 26 as shown in FIG. 10 is attached to the (left side) tip of the central shaft portion 12 '. Between the receiving member 26 and the fixed-position member 22, there is disposed a moving member 24 made of a flexible member such as urethane resin that can be compressed and restored. This receiving member has an outer diameter somewhat larger than the outer diameter of the moving member 24. The receiving member also receives one end of the coil spring 20.

  At the left end of the left chamber A, a porous elastic block 16 such as a foaming urethane resin accommodated in a cylindrical case 14 is disposed, which can be shrunk and restored by oil pressure. . Gas (air) is sealed in each porous hole. The oil in the casing 10 does not penetrate into the elastic block, and soft compression and restoration are possible while crushing the pores by the pressure. Since many of the internal pores exist independently without being connected to each other, gas cannot escape and oil can be prevented from entering the pores.

The moving member 24 is located on the radial center side close to the operating shaft, and is provided with a convex portion 24T so as to surround the central shaft portion 12 'that is a part of the operating shaft. In addition, a lower portion 24L that is higher than the annular groove but lower than the convex portion is provided in the outer region via the annular groove 24K outside the convex portion 24T.
In addition to the form of this example, the moving member uses a hard member such as a metal plate as a base material, for example, a disk-like base material, and an elastic member is integrally provided on the front surface of the disk, and the convex portion as described above. And what provided the low part may be used. In this case, since the basic shape of the moving member can be maintained by the base material, the receiving member 26 for receiving the moving member may be omitted. That is, the receiving member 26 shown in FIG. 3 or the like may be a member having only a function of receiving one end portion of the coil spring 20. Further, it may be a moving member shape in which the annular groove 24K does not exist (in a state where the groove is filled).

  The cylindrical fixed position member 22 of this example is provided with a fixed position member communication path 22H composed of a plurality of longitudinal through holes arranged at equal intervals in the circumferential direction at the position of the predetermined radius. The convex portion 24T of the moving member 22 is formed at a radius position smaller than the predetermined radius. Further, the low portion 24L is an end surface of the fixed position member 22 and faces an end surface region that is outside the fixed position member communication path.

  Therefore, when a sudden external force in the direction of pushing the operating shaft into the casing acts on the rubber member 18 at the outer end of the operating shaft, as shown in FIGS. In this example, the sudden rising pressure of the oil in the chamber A is received from the left side through the through hole 26H provided in the receiving member 26 in the initial stage, and the convex portion 24T of the moving member 24 is It is crushed by being pressed against the end face, and is eventually crushed by receiving the rising pressure from the entire gap between the receiving member 26 and the moving member 24. Thus, the lower portion 24L of the peripheral portion of the moving member that is lower than the convex portion is also pressed against the end face of the fixed position member outside the fixed position member communication path 22H.

  For this reason, the oil flow due to the pressure difference between the left chamber A and the right chamber B via the fixed position member communication path 22H of the fixed position member 22 does not occur, and a small gap between the outer peripheral surface of the fixed position member 22 and the inner surface 10A of the casing 10 It only flows through the small flow path 22SH by δ. Therefore, the rising pressure in the left ventricle A is unlikely to decrease, and a strong external force can be received. When the casing inner diameter is about 10 mm, the small gap δ is as small as about 50 μm, for example.

In this case, the elastic block 16 is compressed and deformed to a soft feeling while crushing the porosity by the rising pressure. Therefore, a strong sudden external force can be received softly.
The pressure in the left chamber A gradually decreases due to both the compressive deformation of the elastic block 16 and the flow through the small flow path 22SH. For this reason, the large compressive deformation of the convex portion 24T of the moving member 24 is somewhat recovered, and the state shown in FIGS. 5 and 9 is obtained. That is, the low portion 24L is released from the contact state with the end face of the fixed position member 22. For this reason, a flow path is formed between the lower portion and the fixed-position member end surface, and oil can flow through the fixed-position member communication path 22H. Therefore, the pressure difference between the left ventricle A and the right ventricle B can be rapidly reduced, and there is no great resistance to the operation shaft 12 entering.

  In this case, the urging force to be restored by compressing the coil spring 20 in the left ventricle A tries to push the operating shaft 12 out of the original state (rightward direction). It can be canceled by a spring (not shown) that closes the door provided on the hinge of the door 50C of the furniture 50. Actually, the operating shaft 12 can enter the final end position by the action of the spring force of the hinge.

  In this way, the compressive deformation of the convex portion 24T eventually extends to the original state, and the state shown in FIG. 6 is reached, which is the end position of the operating shaft stroke. The force that maintains the state shown in FIG. 6 is the spring force of the hinge. When the door 50C is opened by the force of a person facing the hinge spring force, the action shaft 12 is automatically pushed back to the state shown in FIG. During this push-back, the oil in the right chamber B flows into the left chamber A via the fixed position member communication path 22H of the fixed position member 22, so that no special large resistance is shown and the force of the coil spring 20 is used. You can push it back. At the time of this pushing back, the moving member 24, which is formed of a flexible elastic member as a whole, is pressed against the left receiving member 26 and its disk shape is maintained.

  In addition, the shrinkage | contraction volume from the original size of FIG. 3 of the elastic block 16 of the state of FIG. 6 is the same as the volume increment of the action | operation axis | shaft 12 which approached in the casing.

  When the external force is weak, the oil pressure rise in the left ventricle A is small, and the convex portion 24T of the moving member 24 does not go through the state of being crushed strongly as shown in FIG. 4 (FIG. 8). It becomes. Therefore, since the oil in the left chamber A flows sufficiently to the right chamber B, the fluid damper shows only a slight resistance to the operation shaft.

  The moving member 24 in the above embodiment is in a normal state in which no external force is received, and is drawn between the fixed position member 22 and the receiving member 26 and has no gap between the front and rear. 22 and the receiving member 26 have a dimension that exceeds the maximum thickness of the moving member 24, and there is a gap between the moving member in a normal state where no external force is received and the fixed position member. There may be.

  Unlike the above example, the example of FIG. 11 in which the fluid damper of the present invention is applied to a drawer will be described below. The casing 10 may have the same cylindrical shape as that shown in FIG. 3 and the like, but here, the casing 10 is a thin casing having a rectangular cross-sectional shape. Therefore, the fixed-position member 22, the moving member 24, and the receiving member 26 are not circular but rectangular, as viewed from the left or right, but these shapes are not essential to the present invention. In addition, as a matter different from the above example for the storage, the coil spring 20 is provided in the right chamber B, and the operating shaft 12 is urged toward the left chamber A. Further, the operating shaft 12 passes through the fixed position member 22, the moving member 24, and the receiving member 26, and the fixed position member 22 and the receiving member 26 are held at a fixed position with respect to the operating shaft.

Since the action of the moving member 24 is the same, it is omitted here.
For example, the head 12H of the operating shaft 12 outside the casing is attached to an automatic drawing device for a drawer provided in a cabinet described in FIG. In this way, as can be seen from the above description of the case of the storage, the oil resistance is the highest when the automatic pull-in device starts to operate even if it can be pulled out very lightly when being pulled out and stored. Strong resistance is exhibited, and the momentum is received in a soft feeling with the compression action of the elastic block 16. After that, since the strong oil resistance suddenly decreases, the drawer can be stored by the automatic pulling force by the biasing force of the coil spring 20.

  FIG. 12 is a diagram illustrating an example of an automatic retracting apparatus. For example, it is an apparatus using a slide member 34 having a concave portion 34A in which a convex portion 32 provided on a cabinet drawer can be engaged. For example, the rail member 30 having the same width as the casing 10 is disposed between one wall surface 30A and the other wall surface 30B and can slide in the longitudinal direction. The head 12H of the operating shaft 12 of the liquid damper is engaged with the casing side end of the slide member so as to be rotatable so as to enable the inclination described later, and the operating shaft advances and retreats following the longitudinal movement of the slide member. To do. An engagement hole or engagement recess 30 </ b> H is formed at an appropriate position on the other wall surface 30 </ b> B of the rail member 30. On the other hand, the engaging projection 34B is provided on the slide member 34 on the side facing the wall surface 30B.

  Further, the point of action of the tensile force applied to the slide member 34 received from the convex portion 32 engaged with the concave portion 34A is located at a position deviated from the central axis of the operating shaft 12 toward the wall surface 30A. As a result of the drawer movement in the right direction (drawer opening direction), a moment M is generated in the slide member 34 in the clockwise direction in the drawing. Therefore, the engaging projection 34B always presses the wall surface 30B while the slide member is moving in the right direction. When the sliding member reaches the engaging hole 30H, the engaging protrusion 34B enters and engages with the engaging hole 30H. As a result, the slide member tilts as shown by 34 ', and the convex portion 32 moves to the right until the engagement with the concave portion 34A is released and the drawer is fully pulled out with the slide member remaining at the position of the engagement hole. (Indicated by the number 32 ').

When the slide member is in the position indicated by 34 ′, the operating shaft 12 is in the position where it is most pulled out from the casing 10. Further, the coil spring 20 is most compressed. Thereafter, when the drawer is stored, the drawer is pushed in by a human hand. When the convex portion 32 presses the pushing end side wall surface (the left side wall surface in FIG. 12) in the concave portion 34A, the sliding member is now shown in FIG. As a result, a counterclockwise moment is generated, and the engagement between the engagement protrusion 34B and the engagement hole 30H is released. Thereafter, even if the person does not push in the drawer, it is automatically pulled in by the biasing force of the coil spring described above. At the final position where the drawer is drawn, the slide member 34 is in the position shown on the left side of FIG. 12, and the operating shaft is the entry end position.
The automatic retraction mechanism may have another form and is not limited to the form shown in FIG.

  FIG. 13 shows an example of a structure in which the fluid damper according to the present invention is used when a sudden pulling force is applied when pulling out the operating shaft 12, but is different from FIG. 11 in that the moving member 24 and the receiving member 24 are received on the right chamber B side. The member 26 is disposed. Since the operation is clear from the description of the first storage case, it is omitted here.

  INDUSTRIAL APPLICABILITY The present invention can be used for furniture, doors and the like having an opening door, a sliding door, a drawer, and the like.

FIG. 1 is a side view of a cross section of furniture equipped with a fluid damper according to the present invention. FIG. 2 is a view of the damper portion of the furniture of FIG. 1 as viewed from below. FIG. 3 is a longitudinal sectional view showing the entire structure when no external force is applied to the fluid damper used in FIG. FIG. 4 is a state in which a sudden external force is applied and is different from FIG. FIG. 5 shows a state change from FIG. FIG. 6 is a diagram in which the state is further changed from FIG. FIG. 7 is an enlarged view of a main part of FIG. FIG. 8 is an enlarged view of a main part of FIG. FIG. 9 is an enlarged view of a main part of FIG. FIG. 10 is a perspective view of the receiving member. FIG. 11 is a longitudinal sectional view showing a structure of an example in which the fluid damper according to the present invention is used in another form. FIG. 12 is an explanatory diagram of an automatic retracting device. FIG. 13 is a longitudinal sectional view showing the structure of an example in which the fluid damper according to the present invention is used in another form.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Casing 12,12 'Actuating shaft 16 Elastic block 20 Coil spring (biasing means)
22 fixed position member 22H fixed position member communication path 22SH small flow path 24 moving member 24L low part 24T convex part 26 receiving member

Claims (5)

The operating shaft (12) moves back and forth along the longitudinal direction of the casing in the casing (10) filled with fluid,
The indoor diameter dimension of the casing is constant in the operating range of the operating shaft along the longitudinal direction,
A fixed position member (22) is provided at a predetermined position of the operating shaft, and the fixed position member divides the chamber of the casing into two front and rear (A, B) and communicates the two chambers. A small passage (22SH) is provided between the outer periphery of the fixed position member and the inner surface of the casing, as compared with the fixed position member communication path.
A movable member (24) disposed facing the fixed position member and capable of moving back and forth on an operating shaft between the fixed position member and a predetermined position;
The moving member is
In the facing region that faces the fixed position member, it has a convex portion (24T) that protrudes most to the fixed position member side, and the convex portion has elasticity in the front-rear direction and can be compressed and restored. Even if the convex portion comes into contact with the fixed position member, the communication between the two chambers via the fixed position member communication path is not disabled.
In the facing region facing the fixed position member, it has a low part (24L) lower than the convex part, and the low part can contact the fixed position member by compression of the convex part, When contacting the fixed position member, communication between the two chambers via the fixed position member communication path can be disabled,
A fluid damper characterized in that an elastic block (16) is arranged in the casing, and the elastic block can be contracted and restored by the pressure of the fluid.   The fluid damper according to claim 1, further comprising an urging means (20) for urging the operating shaft in the front direction or the rear direction.   The moving member is formed of an elastic member that is softer than the fixed-position member as a whole, the convex portion is located on the radial center side close to the operating shaft, and the low portion is more than the convex portion. The fluid damper according to claim 1, wherein the fluid damper is located outside in the radial direction.   The moving member is formed of an elastic member that is softer than the fixed-position member as a whole, the convex portion is located on the radial center side close to the operating shaft, and the low portion is more than the convex portion. The fluid damper according to claim 2, which is also located outside in the radial direction.   A receiving member provided at a position sandwiching the moving member formed of the elastic member with the fixed position member, formed of a member harder than the moving member, and having a radial dimension equal to or greater than the moving member. The fluid damper according to claim 4, wherein the member is fixed to the operating shaft.

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