JP2007046729A - Fluid damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid damper capable of increasing resistance in pressing a piston therein, reducing resistance in the middle and reducing fluid resistance in drawing-out in comparison with that in pressing-in. <P>SOLUTION: In this fluid damper, a cylinder 10 is provided with a stationary member 22 on a tip portion of a working shaft 2, and a moving member 23 moving between the stationary member and a tip prescribed position 12A, and the moving member has a sliding member 24 radially deformable. The sliding member is closely kept into contact with and slid on cylinder inner walls 10A, 10B of a certain area S1, and has a clearance with respect to a large-diameter area inner wall 10B', and the moving member is provided with communication passages 24H, 26H for communicating a cylinder chamber A on one side and a cylinder chamber B on the other side. Further the stationary member has a stationary member communication passage 22H, and the moving member is constituted to be closely kept into contact with the stationary member so that the cylinder chamber at one side and the cylinder chamber at the other side are not communicated with each other, excluding a case of being communicated through the stationary member communication passage and the communication passage in the certain area. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fluid damper that relaxes or changes the momentum of operation over the entire operating range or a part thereof. Therefore, when the double doors, sliding doors, drawers, and the like are changed from the opened state to the closed state, the door can be used for a door, furniture, or the like configured to apply the damper from a position before a predetermined stroke to be closed.

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.
JP 2004-135725 A JP 2003-193740 A

However, the fluid damper can be operated in various resistance changes by various structures according to the purpose.
The problem to be solved by the present invention is that the fluid resistance increases when the piston is pushed in, the fluid resistance becomes smaller than the first half during pushing, and the fluid resistance becomes smaller than when pushing the piston. It is to provide a fluid damper.

In the first invention, fluid is put in a cylinder that moves back and forth of the operating shaft, and the cylinder is provided with a constant region having a constant inner diameter on the entry start side of the operating shaft, and operates continuously in the constant region. A fixed-position member having a large-diameter region having an inner diameter larger than that of the fixed region on the approach end side of the shaft, and having a gap with respect to the inner wall of the cylinder in the fixed region at a fixed position at the front portion of the operating shaft And has a moving member that moves on an operating shaft between the fixed position member and a predetermined position ahead of the fixed position member, and the moving member has a deformability in the radial direction at least in an outer peripheral portion facing the inner wall of the cylinder. A sliding member, and the sliding member slides in a fluid-tight manner on the inner wall of the cylinder in the fixed region, and has a size configuration that creates a gap with the inner wall of the cylinder in the large-diameter region. Due to the presence of the moving member. A communication passage that communicates between the cylinder chamber on one side and the cylinder chamber on the other side that are separated from each other, and communicates with the communication passage when the moving member is in close contact with the fixed position member, The fixed-position member communication path capable of communicating the cylinder chamber on the one side and the cylinder chamber on the other side, and the moving member is in contact with the fixed-position member in the fixed region Provided is a fluid damper characterized in that close contact is possible without allowing communication between a cylinder chamber on one side and a cylinder chamber on the other side except through a member communication path and the communication path.
The cylinder of the present application is not limited to a cylinder, and may be a cylinder having 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 expression “diameter” includes one side such as a rectangle.
The large diameter of the large-diameter region includes a case where a groove is provided on the inner wall of the cylinder and the cross-sectional area becomes large due to the presence of the groove.
The phrase “having (having) a gap” includes, for example, a case where a groove is provided on the inner wall of the cylinder and fluid is communicated with the front and rear of the member through this groove.
The fluid-tight state is an air-tight state in the case of gas and a liquid-tight state in the case of liquid.

  In a second invention, the moving member of the first invention has a plate-like flexible member that is more flexible than the fixed-position member, and a hard member that is more difficult to deform than the flexible member, The hard member is arranged on the side facing the fixed position member and has an outer diameter that contacts the inner wall of the cylinder in the fixed region, and the hard member is arranged on the opposite side of the fixed position member with respect to the flexible member. The outer diameter has a gap with respect to the inner wall of the cylinder in the predetermined region, and the communication path is provided between the hard member and the flexible member.

  In a third invention, the moving member of the first invention is a flexible member formed mainly in a plate shape mainly made of a material that is more flexible than the fixed-position member. A hard member that is difficult to perform, and is provided with another fixed position member having an outer diameter having a gap with respect to the inner wall of the cylinder in the predetermined region, and when the flexible member is in contact with the other fixed position member, The communication path is provided at the position of the other fixed position member corresponding to the communication path of the flexible member.

In the fourth invention, the large-diameter region of the first to third inventions is configured such that the diameter gradually increases from the boundary with the constant region.
According to the fifth aspect of the invention, there is provided an urging means for urging the operating shaft of the first to fourth aspects of the invention in the direction of the entry end position.
As the urging means, an elastic member such as a rubber member can be used in addition to a spring member such as a coil spring or a leaf spring.
In the sixth aspect of the invention, urging means for urging the operating shaft of the first to fourth aspects of the invention in the approach start position direction is provided.

In the first aspect of the invention, when the operating shaft starts to enter from the most pulled out position, the moving member is pushed by the fluid in the cylinder chamber on one side and is pressed against the fixed position member at the fixed position on the tip of the working shaft. In this state, the communication path and the fixed-position member communication path communicate with each other, and the other passages do not communicate with each other, so that the operating shaft advances while exhibiting a predetermined fluid resistance. When the large member enters the large-diameter region after passing a certain region, a gap is formed between the moving member and the inner wall of the cylinder, and a flow path through the gap is newly secured, so that the fluid resistance is reduced.
When the operating shaft is to be pulled out from the entry end position, the moving member is pushed by the fluid in the cylinder chamber on the other side and pushed to a predetermined position ahead of the fixed position member. Therefore, while passing through the large-diameter region, in addition to the flow path in the case where the operating shaft has been entered, the fixed position member and the moving member face each other through the gap between the outer periphery of the fixed position member and the cylinder inner wall. The flow resistance passing through the gap between the surfaces is reduced by the amount of a new flow path that communicates with the communication path of the moving member. In addition, when entering the fixed region, in addition to the flow path when the working shaft has entered, the gap between the outer surface of the fixed position member and the inner wall of the cylinder passes between the facing surfaces of the fixed position member and the moving member. The flow resistance passing through the gap is reduced by the addition of a new flow path communicating with the communication path of the moving member.

  In 2nd invention, the form of the moving member is prescribed | regulated, it has a flexible plate-like flexible member and a rigid member, and the form which positions a flexible member between a rigid fixed position member and the said rigid member And Thereby, even if a flexible member moves to any side according to the advancing / retreating movement direction of the operating shaft, it is held by a harder member and its shape is held.

  In the third invention, the moving member is constituted by a flexible member mainly composed of a flexible material, and the hard member is provided as another fixed-position member at a predetermined predetermined position described in the first invention. Thereby, even if a flexible member moves to any side according to the advancing / retreating movement direction of the operating shaft, it is held by a harder member and its shape is held.

In the fourth invention, the fluid resistance changes smoothly because the large diameter region gradually increases in diameter.
In the fifth aspect of the invention, since the operating shaft is biased in the direction of the entry terminal position, the operation shaft is normally in the entry terminal position. If the fluid damper is connected to an object such as a drawer to which the fluid damper is to be applied at the rear end of the operating shaft, the operating shaft is drawn out within the stroke range according to the opening movement of the object, and the operating shaft enters according to the storage movement. . Therefore, if the object is opened by connecting with an object via an automatic pull-in mechanism, the object can be opened with a small resistance force. With this, you can pull in automatically while relaxing the momentum.

  In the sixth aspect of the invention, since the operating shaft is biased in the direction of the entry start position, the operation shaft is normally at the entry start position. Even if the target object is carelessly stored and moved without being connected to the operating shaft, it can be received by the operating shaft and the momentum can be reduced by the action of the fluid damper. When the object is moved and moved by hand so that the operating shaft enters the entry end position and the end position is held by an appropriate means such as a latch mechanism, the object is completely stored. If the object is opened, the operating shaft returns to the entry start position by the action of the urging means.

  FIG. 1 is a plan view with a partially omitted cross section showing the entire structure of one liquid damper of a fluid damper using a cylinder / piston mechanism according to the present invention. The cylinder 10 in this case has a rectangular cross section, and the inner wall surfaces 10A and 10B (10B ') are the wall surfaces on the short side. The length of the short side is constant at any position. The wall surface 10B is parallel to the wall surface 10A, but the inclined wall surface 10B ′ is not parallel to the wall surface 10A, and the distance from the wall surface 10A, that is, the length of the long side of the rectangle is moved from the position P2 to the left in the figure. The diameter gradually increases.

  An operating shaft 12 is inserted into the cylinder 10 and is configured to be capable of moving forward and backward. The member 18 is a ring member for sealing. The operating range of the operating shaft 12 is a stroke from the position P1 to the position P3. The range of the stroke S1 is the inner diameter of the cylinder, that is, the distance between the short sides, that is, the distance between the wall surfaces 10A and 10B, which is the length of the long side, and is constant toward the left in the figure during the stroke S2. The diameter gradually increases. The range of the cylinder stroke S1 is referred to as a constant region, and the range of the stroke S2 is referred to as a large diameter region. Oil is injected into the cylinder 10 with the operating shaft 12 retracted to the position P1. Therefore, if the operating shaft advances forward from this position, the oil will overflow from the cylinder. In order to absorb this overflowing oil, an absorbent material 16 made of urethane foam is disposed, and its inner peripheral side is covered with an inner sealing cover 14.

  A fixed position member made of a rectangular plate member is held at a fixed position at a predetermined position on the front portion of the operating shaft 12 and is held by a member 12B such as a C ring. The outer diameter is smaller than the inner diameter of the fixed region S1, and a gap is generated with respect to the wall surface of the fixed region. Accordingly, a gap is also generated on the wall surface of the large diameter region S2. The fixed-position member 22 can be formed of a synthetic resin material or metal that has a normal hardness and can be used as a structural material, such as vinyl chloride or polyamide resin. A moving member 23 is provided that is movable at a predetermined position ahead of the member 22 and on the operating shaft between the distal end large diameter portion 12A of the operating shaft. In this example, the moving member 23 is composed of two rectangular plate-like members 24 and 26.

  The plate-like sliding member 24 is formed of a flexible member having deformability in the radial direction (the direction between the wall surfaces 10A and 10B), for example, urethane resin, so as to be slidable while being in contact with the inner wall of the cylinder. The outer diameter is set to a dimension that allows the liquid to come into sliding contact with the inner wall of the fixed region S1 without a gap. Therefore, it closely contacts not only the rectangular short side wall surfaces 10A and 10B but also the long side wall surfaces.

  On the other hand, the plate-like hard member 26 is formed of the same structural material as the fixed position member 22. Moreover, the outer diameter is also smaller than the inner diameter of the fixed region S1, and a gap is formed with respect to the wall surface of the fixed region. In this example, the two members 24 and 26 are not integrated but separated. A sliding member 24 is disposed between the hard member 26 and the fixed position member 22. When these three members 22, 24, 26 are polymerized in contact with each other, a communication passage that communicates between the left chamber A and the right chamber B of the cylinder partitioned by these members so as to allow oil in each chamber to pass therethrough. Is formed. The member 22 is provided with a fixed position member communication path 22H, the member 24 is provided with a communication path 24H, and the member 26 is provided with an appropriate number of communication paths 26H, for example, two. The communication paths of the members 24 and 26 are circular straight paths having the same diameter in cross section, and the member 22 is a circular path although having a circular cross section. The diameter is reduced toward the right chamber B side from a circle having the same size as the straight path.

  In this case, since the cylinder is a rectangular cylinder, the members 22, 24, and 26 do not rotate around the operating shaft, so that the communication paths are always in corresponding positions. When the cylinder is a cylinder, it is necessary to devise a way to stop the rotation so that each member does not rotate relative to the key, for example, to slide on the key. The members 24 and 26 may be integrated by bonding or the like. However, the member 26 may be configured not to move on the operating shaft but to be held at a fixed position pressed against the distal end large diameter portion 12A, and only the member 24 may be movable. Further, as another form example, a flexible member similar to the member 24, for example, a slide formed of a urethane resin so as to fill a gap between the movable member 26 and the cylinder inner wall in the fixed region S1. The moving member may be fixedly held.

A coil spring 20 is provided so as to allow the operating shaft to pass therethrough for an automatic pulling mechanism to be described later, and the operating shaft is always biased toward the approach end position.
The state of FIG. 1 is a state in which the operating shaft is about to be pulled out from the entry end position. First, as shown in FIG. 3, from the position where the operating shaft 12 is sufficiently pulled out and retracted, within the range of a certain region S1. A description will be given of a state where the vehicle is approaching in the approach end position direction (left direction in FIG. 1).

  Since the operating shaft 12 moves to the left, the moving member 23 receives the resistance of the oil and comes into contact with and close contact with the fixed position member 22. When the operating shaft enters in this state, the inside of the cylinder is completely divided into left and right A and B by the sliding member 24. Only the oil flows from the chamber A to the chamber B through the flow path through the communication paths 26H, 24H and the fixed position member communication path 22H. In this case, the oil resistance is the largest.

  Next, when entering the large diameter region S2, as shown in FIG. 4, a gap is formed between the outer periphery of the sliding member 24 of the moving member 23 and the inclined wall surface 10B ′, and the flow path of FIG. In addition, oil flows even if this gap is used as a flow path. Accordingly, the oil resistance is reduced.

  Returning to FIG. 1, when the operating shaft is pulled out again from the entry end position, the moving member 23 is pressed against the distal end large diameter portion 12 </ b> A by oil resistance. In addition to the flow path passing through each communication path, a flow path passing through the gap between the outer periphery of each member 22, 24, 26 and the cylinder inner wall 10A, 10B ′ is opened (in this embodiment, in addition to the long side, No gap is formed between the outer periphery of 24 and the wall surface 10A.) Oil resistance becomes very small. Also, the resistance force by the coil spring starts from the smallest state.

  When entering the range of the constant region S1, eventually, as shown in FIG. 2, there is no gap between the outer periphery of the sliding member 24 and the inner wall of the cylinder, the corresponding flow path is eliminated, and the oil resistance increases accordingly. However, there is a gap on the outer periphery of the member 22, and oil flows from the chamber B to the chamber A through the communication passages 24H and 26H. Therefore, the oil resistance is smaller than in the case of FIG. Therefore, the oil resistance increases in the order of FIG. 1, FIG. 4, FIG. 2, and FIG. Therefore, when the head 12H of the operating shaft 12 protruding out of the cylinder is attached to, for example, an automatic retracting device provided in the cabinet drawer described in FIG. Even if it can be pulled out lightly and stowed, even if it is stowed vigorously, when the automatic retracting device starts to operate (FIG. 3), it can exhibit its strongest resistance and relax its momentum. ), Since the strong resistance is reduced, it can be accommodated with minimal waste of automatic pulling force due to a spring or the like.

  FIG. 5 is a diagram showing an example of an automatic pull-in device. 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 cylinder 10 is disposed between one wall surface 30A and the other wall surface 30B and can slide in the longitudinal direction. The head portion 12H of the operating shaft 12 of the liquid damper is engaged with the cylinder side end of the slide member so as to be able to be tilted as described later, and the operating shaft advances and retreats as the slide member moves in the longitudinal direction. . 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 of the convex portion 32 engaged with the concave portion 34A is located at a position offset toward the wall surface 30A side from the central axis of the operating shaft 12, and is directed to the right (open) in the figure. Direction), a moment M is generated in the slide member 34 in the clockwise direction in the drawing. Accordingly, 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 is inclined as indicated by 34 ', and the convex portion 32 is disengaged from the engaged state with the concave portion 34A and moves to the right until the drawer is fully pulled out with the slide member remaining (at 32'). Show).

  When the slide member is at the position indicated by 34 ', the position where the operating shaft 12 is most pulled out from the cylinder 10, that is, the member 22 is at the stroke start end position P1 in FIG. 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 pushes the pushing end side wall surface (the left side wall surface in FIG. 5) of the concave portion 34A, this time, the counterclockwise on the drawing. A moment in the direction 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. In the final position where the drawer is drawn, the slide member 34 is the position shown on the left side of FIG. 5, and the operating shaft is the entry end position shown in FIG. 1 (the member 22 is the position of the final position P3 of the stroke S1 + S2).

  At the beginning of pulling out the above-mentioned drawer, the biasing force of the coil spring 20 is the smallest, and the oil resistance increases in the order of FIGS. 1, 4, 2, and 3, so that it can be pulled out lightest. In this case, when the automatic pull-in mechanism starts to operate, the state shown in FIG. 3 is reached, so that the oil resistance is the highest, and the drawer with the momentum is moved and moved. Serves buffering action. Thereafter, the state shown in FIG. 4 is reached, and the oil resistance can be reduced to maximize the automatic pull-in force of the coil spring 20.

The automatic retraction mechanism may have another form, and is not limited to the form shown in FIG. Further, although the fixed position member communication path 22H provided in the member 22 has a conical shape, it may have a cylindrical shape. In order to increase the oil resistance at the beginning (FIG. 3) when the operating shaft 12 enters (FIG. 3) and to make it as small as possible when retracting (FIGS. 1 and 2), it is conical.
In the above embodiment, the method of gradually changing the cylinder inner diameter is such that one wall surface is inclined, but both wall surfaces may be inclined so as to be symmetrical with respect to the central axis. Further, the cylinder is not rectangular, but a cylinder having a cylindrical shape or other shapes may be used.

  As described above, as an application form of a liquid damper or a gas damper, if an urging means is urged in the direction in which the operating shaft protrudes from the cylinder, the object can be obtained without connecting an object such as a drawer. The buffering action of the storage movement of the object can be achieved.

  INDUSTRIAL APPLICABILITY The present invention can be used for furniture and doors having double doors, sliding doors, drawers, and the like.

FIG. 1 is a plan view with a partially omitted cross section of the overall structure of a liquid damper according to the present invention. FIG. 2 is an enlarged view of a main part in the middle of pulling out the operating shaft. FIG. 3 is an enlarged view of a main part during the operation shaft being entered. FIG. 4 is an enlarged view of a main part at another position while the operating shaft is advanced. FIG. 5 is an illustration of an automatic retracting device.

Explanation of symbols

10 Cylinder 12 Operating shaft 22 Fixed position member 22H Fixed position member communication path 23 Moving member 24 Sliding member 24H Communication path 26 Hard member 26H Communication path S1 Constant area S2 Large diameter area

Claims (6)

A fluid is placed in a cylinder that moves back and forth on the operating shaft, and the cylinder has a constant region with a constant inner diameter on the entry start side of the working shaft, and continuously on the entry end side of the working shaft. A large-diameter region having an inner diameter larger than the constant region,
A fixed position member having a gap with respect to the inner wall of the cylinder in the fixed region is provided at a fixed position at the front portion of the operating shaft,
A moving member that moves on an operating shaft between the fixed position member and a predetermined position ahead of the fixed position member;
The moving member has a sliding member having deformability in the radial direction at least on an outer peripheral portion facing the inner wall of the cylinder,
The sliding member slides in a fluid tight manner with respect to the inner wall of the cylinder in the fixed region, and has a size configuration that creates a gap with the inner wall of the large diameter region,
The moving member is provided with a communication passage that communicates between one cylinder chamber and the other cylinder chamber that are separated by the presence of the moving member, and the moving member is in close contact with the fixed position member. A fixed-position member communication path capable of communicating with the communication path when in contact with the cylinder chamber on one side and the cylinder chamber on the other side;
The moving member can be in close contact with the fixed position member so that the cylinder chamber on one side and the cylinder chamber on the other side do not communicate with each other except through the fixed position member communication path and the communication path. A fluid damper characterized in that The moving member has a plate-like flexible member that is more flexible than the fixed-position member, and a hard member that is more difficult to deform than the flexible member,
The flexible member is disposed on the side facing the fixed position member and has an outer diameter dimension that abuts against a cylinder inner wall of the fixed region,
The hard member is disposed on the opposite side of the fixed position member with respect to the flexible member, and has an outer diameter dimension having a gap with respect to the cylinder inner wall of the fixed region,
The fluid damper according to claim 1, wherein the communication path is provided between the hard member and the flexible member. The moving member is a flexible member formed mainly in a plate shape with a material more flexible than the fixed position member,
The fixed position on the tip is a hard member that is harder to deform than the flexible member, and is provided with another fixed position member having an outer diameter having a gap with respect to the inner wall of the cylinder in the fixed region,
The fluid damper according to claim 1, wherein when the flexible member abuts on the other fixed position member, a communication path is provided at a position of the other fixed position member corresponding to the communication path of the flexible member.   The fluid damper according to any one of claims 1 to 3, wherein the large-diameter region gradually increases in diameter from a boundary with the constant region.   The fluid damper according to any one of claims 1 to 4, further comprising an urging means for urging the operating shaft toward the approach end position.   The fluid damper according to any one of claims 1 to 4, further comprising an urging unit that urges the operating shaft toward the approach start position.

Images