JP4695455B2 - Fluid friction resistance type braking device - Google Patents

Description

  The present invention relates to a fluid friction resistance type braking device that is preferably used for a door such as a sliding door or a folding door provided with a self-closing device and that can adjust a speed when the door moves by the self-closing device.

  In hospitals, various facilities, toilet booths for persons with disabilities, etc., doors equipped with self-closing devices have been frequently used in recent years. This self-closing device, for example, biases the door in the closing direction by a spring or an inclined rail, opens the door manually against the self-closing device, and when the hand is released, the door automatically closes toward the closed position. To start. The self-closing speed is gradually accelerated and becomes a considerable closing speed just before the door is closed. When the door is closed as it is, the door collides with the frame of the door frame while generating a loud collision sound. At this time, there is a risk that an elderly person, an infant, a person in a wheelchair or the like may be caught between the door and the frame. In order to prevent such a situation, a braking device is usually provided to reduce the speed of the door.

As the braking device, an air cylinder method, a hydraulic cylinder method, a hydraulic pump method, a fluid friction resistance method, and the like are known, but each has various problems. For example, the air cylinder method has problems of air intake / exhaust noise and durability, and the hydraulic method is expensive, and the centering operation at the time of mounting is troublesome and there is a risk of oil leakage. In addition, the usual fluid friction resistance method has many structures that are complicated and it is difficult to adjust the braking resistance. An apparatus that can easily adjust the braking resistance is also known (see, for example, Patent Document 1). The adjustment screw is screwed into the center of the shaft, and the adjustment drum is rotated to move the movable drum, and the friction braking force of the movable drum against the rotation drum is adjusted by changing the contact and sliding area with the rotation drum. It is configured. However, the movable drum is held in an unstable state only by being configured to move in a state in which the protrusion provided on the outer periphery engages with a groove provided in the housing and is prevented from rotating, Even if the adjustment screw screwed into the center of the movable drum and the screw engagement of the movable drum are slightly shaken, a large shake is generated at the outer peripheral portion, and the protruding portion does not accurately engage with the groove so that the movable drum is smooth. There was a risk that it would be difficult to slide it. In addition, since the housing must be fixed, a rotating drum is provided in the housing and a movable drum is provided so that the position of the rotating drum can be moved, the configuration becomes complicated and the number of parts is large. Could not be obtained economically.
JP-A-8-93312 (0009, 0014, FIG. 2, FIG. 4)

  The solution of the present invention is to provide a fluid frictional resistance braking device that is preferably used for a door that moves with a self-closing device as described above, and has a simple structure, smooth movement of each member, and reliable adjustment. An object of the present invention is to provide the above-described apparatus that can be obtained economically with a small number of parts.

  According to the present invention, a support shaft is supported on a support base via a one-way clutch, a main body is rotatably attached to the support shaft, a pinion gear is provided on the outer periphery of the main body, and a fluid is sealed in the main body. A fluid friction resistance type braking device characterized in that a resistor is non-rotatably attached to an inner shaft portion of a support shaft existing in the main body, and the rotation of the main body is braked by the resistor according to the rotation direction. Is provided, and the above-mentioned problems are solved.

  Further, according to the present invention, the braking device forms an annular groove in one member of the inner surface of the main body or the resistor, and forms an action piece fitted into the annular groove in the other member, The resistor is moved along the inner shaft to adjust the amount of insertion of the annular groove and the action piece. The inner shaft is formed in the arm, and the through hole of the resistor is formed in the arm. The fluid frictional resistance type brake which is slidably inserted, the adjustment screw inserted rotatably in the adjustment hole of the support shaft is screw-engaged with the resistor, and the resistor is moved by the adjustment screw. An apparatus is provided.

  The present invention is configured as described above, and the main body is provided with a pinion gear so that the main body can be rotated, a fluid is enclosed in the main body, and the main body is rotatably attached to one end of a support shaft. Since a resistor is provided on the inner shaft portion of the support shaft existing inside, and the support shaft is supported on the support base via the one-way clutch, the resistor is not used when the support shaft is freely rotated by the one-way clutch. It rotates together with the main body, but when the rotation of the support shaft is blocked by the one-way clutch, the rotation of the main body can be braked by the resistor, and the main body can be rotated without fixing the main body as in the past. Therefore, the overall configuration can be simplified.

  In addition, an annular groove is formed on either the inner surface of the main body or the resistor, and an operating piece that fits into the annular groove is formed on the other member, and the resistor is moved so that the annular groove and the operating piece Since the insertion amount is adjusted, it is easy to adjust the braking resistance, and the resistor is provided with a through hole, and the resistor is moved by inserting the through hole into an arm provided on the inner shaft portion. Therefore, the resistor can be held in a stable state with a simple structure, can move accurately and smoothly in the axial direction without being inclined, and the braking resistance can be adjusted with high accuracy. Further, since there is no need to provide a rotating drum or a movable drum in the main body as in the prior art, the number of parts is small, the configuration is simplified, and it can be obtained economically.

  1 and 2 show an embodiment in which the present invention is applied to a sliding door. The sliding door (1) is suspended on a rail (5) fixed to a door frame (upper frame) (3) by a hanger (2). The door cart (4) provided on the hanger (2) is provided to be openable and closable by rolling on the rail (5). An appropriate self-closing device (not shown) is provided between the sliding door (1) and the door frame (3). When opening the sliding door, the sliding door is manually opened against the self-closing device, When the hand is released from the sliding door, the sliding door (1) moves toward the closed position by the self-closing device.

  The hanger (2) is provided with a braking device (6) so that it does not impact the door frame (saddle frame) when it reaches the closed position. The braking device (6) includes a support base (7) fixed to the hanger (2) and a body (9) having a pinion gear (8), and when the pinion gear (8) approaches the closed position, A rack (10) is provided at an appropriate position of the door frame (3) so as to engage with each other.

  3 to 5 show an embodiment of the braking device (6) of the present invention. As described above, the braking device (6) includes the support base (7) and the main body (9). The main body (9) is pivotally supported on the support base (7) via the one-way clutch (11). Further, it is rotatably provided at one end of the support shaft (12). The one-way clutch (11) is configured to permit the rotation of the support shaft when the main body rotates in the direction to open the sliding door and to prevent the rotation of the support shaft when the main body rotates in the closing direction.

  The support shaft (12) is secured to the support base (7) by a retaining ring (13), and the main body (9) is rotatably held by a bearing (14) such as a ball bearing or a washer (15). Yes. Further, the inner shaft portion (16) of the support shaft existing in the main body (9) is expanded in diameter, and as shown in FIG. 5, a plurality of arms (17) in the embodiment shown in the figure, (17), and an adjustment hole (18) is formed inside.

  A resistor (20) in which through holes (19) and (19) are formed so as to be inserted through the arms (17) and (17) of the support shaft (12) is provided. The through holes (19) and (19) The resistor (20) is held by the arms (17) and (17) so as to be slidable in the axial direction in a non-rotating state. A screw hole (21) is formed in the center of the resistor (20).

  The main body (9) has a case (22) and a cover (23) fixed to the case (22) with a bolt (not shown) or the like, and fluid such as dimethyl silicone oil or other appropriate viscous fluid is contained therein. It is enclosed. The pinion gear (8) is provided on the outer periphery of the case (22) so as to engage with the rack (10). The pinion gear (8) may be formed integrally with the case (22), or may be formed separately from the case (22) and fixed to the case (22). Further, an appropriate oil seal (24) is provided at an appropriate place in the main body.

  An annular groove (25) is formed in either the inner surface of the main body (9) or the resistor (20), and the other member is inserted into the annular groove (25) via the fluid. A working piece (26) to be inserted is formed. In the embodiment shown in FIG. 3 and the like, an action piece (26) is formed on the cover (23) of the main body (9), and an annular groove (25) and a small fluid flow hole (27) are formed on the resistor (20). However, the annular groove (25) may be formed on the main body side, and the action piece (26) may be formed on the resistor side, or a plurality of concentric circles may be formed.

  An adjustment screw (28) that engages with a screw hole (21) of the resistor (20) is rotatably mounted in the adjustment hole (18) provided in the support shaft (12). An oil seal (29) is provided around the adjustment screw (28), and is secured by an annular retaining piece (30). A screwdriver (32) is formed in a retaining groove (32) formed in the head (31). (Not shown) or the like can be inserted and rotated.

  With the above configuration, when the sliding door is opened, the support shaft (12) and the resistor (20) are freely rotated by the one-way clutch (11) even if the rack (10) and the pinion gear (8) are engaged. Therefore, the rotation of the main body (9) is not braked. Therefore, no braking force acts between the pinion gear (8) and the rack (10), and the sliding door is lightly opened.

  When closing the sliding door, the one-way clutch (11) prevents the support shaft (12) and the resistor (20) from rotating, so when the rack (10) and the pinion gear (8) are engaged, the main body ( The rotation of 9) is braked by a resistor, a braking force is generated between the pinion gear (8) and the rack (10), and the movement of the sliding door is braked.

  The braking resistance can be adjusted by rotating the adjusting screw (28) to move the resistor (20) and varying the amount of insertion of the annular groove (25) and the action piece (26) (FIG. 3, see FIG. At this time, since the resistor (20) moves in the axial direction while being fitted to the arms (17) and (17), the resistor (20) can be smoothly moved in a stable state without being inclined and adjusted accurately. Can do.

The explanatory view seen from the side which shows one example of the present invention and shows the relation between a sliding door and a door frame. The partial front view which shows the relationship between a sliding door upper part and a door frame. Sectional drawing of a braking device. Sectional drawing of the state which moved the resistor from the state shown in FIG. The exploded perspective view of a spindle, a resistor, etc.

Explanation of symbols

6 Braking device 7 Support base 8 Pinion gear 9 Main body 10 Rack 11 One-way clutch 12 Support shaft 17 Arm 20 Resistor 22 Case 23 Cover 25 Annular groove 26 Working piece 28 Adjustment screw

Claims (2)

A support shaft is supported on a support base via a one-way clutch, a main body is rotatably attached to the support shaft, a pinion gear is provided on the outer periphery of the main body, a fluid is sealed in the main body, and a support existing in the main body is provided. In a fluid frictional resistance type braking device in which a resistor is non-rotatably attached to the inner shaft portion of the shaft and the rotation of the main body is braked by the resistor according to the rotation direction . An annular groove is formed in one of the members and an operating piece that fits in the annular groove is formed in the other member, the inner shaft portion is expanded to form a plurality of arms, A through hole is provided in which the arm is slidably inserted, an adjustment hole is formed in the support shaft, an adjustment screw is rotatably inserted into the adjustment hole, and the adjustment screw is screw-engaged with the resistor. The adjustment screw is rotated to move the resistor, and the annular groove and the action piece Fluid friction resistance type braking device, characterized in that to adjust the fit amount. 2. The fluid frictional resistance braking device according to claim 1 , wherein the main body includes a case and a cover, the action piece is formed in the cover, and the annular groove is formed in the resistor.

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