JP4589841B2 - Fluid friction resistance type braking device - Google Patents

Description

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

  In recent years, doors equipped with self-closing devices have been used in hospitals, various facilities, toilet booths for the disabled, and the like. As this self-closing device, for example, a spring method or an inclined rail method is used. The door is manually opened, and when the hand is released, the door starts self-closing. This self-closing speed is gradually accelerated, and the closing speed becomes considerable immediately before the door is closed. If the door is closed as it is, it will collide while generating a loud collision sound in the frame of the door frame, and elderly people, infants, people in wheelchairs, etc. There is also a risk of being caught between the door and the frame. Therefore, a braking device is usually provided to reduce the speed of the door.

As the braking device, there are known an air cylinder method, a hydraulic cylinder method, a hydraulic pump method, a fluid friction resistance method, etc., but the air cylinder method has problems of air intake / exhaust noise and durability. It was expensive and the centering during installation was cumbersome and there was a risk of oil leakage. Further, in the normal fluid friction resistance method, 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). In this apparatus, a movable drum and a rotary drum provided in a housing are fitted via a viscous fluid, and the movable drum is fitted. The adjustment screw is screwed into the center of the shaft, and the adjustment screw 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 to 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 a rotating drum and a movable drum must be provided in the casing, the configuration is complicated and the number of parts is large, which cannot be obtained economically.
JP-A-8-93312 (0009, 0014, FIG. 2, FIG. 4)

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

  According to the present invention, a fluid is sealed in a main body, a rotating shaft connected to a pinion gear through a one-way clutch is inserted into the main body, and slides on an inner shaft portion of the rotating shaft existing in the main body. A resistor is fitted to the inner surface of the main body or one member of the resistor, and an operating piece to be fitted into the annular groove is formed on the other member. A through hole extending in the radial direction and extending in the axial direction is connected to the resistor, and a slide plate to be inserted into the through hole is connected to the resistor. An adjustment hole is formed, and an adjustment screw is rotatably mounted in the adjustment hole. The adjustment screw is screw-engaged with the slide plate, and the adjustment screw is rotated to move the resistor along the inner shaft portion. And a fluid friction resistance type braking device characterized by being moved in the axial direction. It is.

  The present invention is configured as described above, a rotating shaft is inserted into a main body enclosing a fluid, and a resistor is slidably fitted to an inner shaft portion of the rotating shaft existing in the main body. Alternatively, an annular groove is formed in one member of the resistor, and an operating piece that fits into the annular groove is formed in the other member, and a slide plate is inserted into the through hole formed in the inner shaft portion, and the resistor The adjustment screw is screw-engaged with the slide plate, and the adjustment screw is rotated to move the resistor in the axial direction along the inner shaft portion. The fitted resistor is held in a stable state, moves in the axial direction accurately and smoothly without being inclined, and does not interfere with rotation, and is fitted in an annular groove so as to be freely rotatable via a fluid. The braking force can be adjusted by adjusting the insertion amount of the action piece. 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, and the configuration can be obtained easily and economically.

  1 and 2 show an embodiment in which the present invention is applied to a sliding door. The sliding door (1) is suspended by a hanger (2) on a door frame (upper frame) (3), and is attached to the hanger (2). The provided door cart (4) is provided to be openable and closable by rolling on the rail (5) of the door frame. 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) has a pinion gear (7), and a rack (8) is provided at an appropriate position of the door frame (3) so that the pinion gear (7) meshes when approaching the closed position.

  3 to 5 show an embodiment of the braking device (6) of the present invention. The apparatus includes a case (9) fixed to the hanger (2) with a bolt or the like, and a body (10) fitted to the case (9) via an oil seal and fixed with a bolt or the like ( 11), and fluid such as dimethyl silicone oil or other appropriate viscous fluid is sealed inside. The main body (11) has a bearing (12) at one end and a boss portion (14) having a support hole (13) at the other end, and is pivotally supported by the bearing (12) and the boss portion (14). The rotating shaft (15) is inserted so that it may do.

  The rotating shaft (15) does not transmit the rotation of the pinion gear to the rotating shaft when the sliding door is opened, and transmits the rotation of the pinion gear to the rotating shaft when the sliding door is closed, via the one-way clutch (16). It is connected to the pinion gear (7) and is prevented from coming off by a retaining piece (17), and oil seals (18) and (19) are provided on the side of the bearing (12) and on the boss part (14). A flat washer (20) is provided between the inner surface of the case (9).

  The inner shaft portion (21) of the rotating shaft (15) existing inside the main body (11) is formed with a through hole (22) that opens in the radial direction and extends in the axial direction, and the shaft portion on the outer surface. A slide plane (23) is formed in an opposing state. The rotating shaft (15) is formed with an adjustment hole (24) that opens outward from the main body (11) and communicates with the through hole (22).

  A resistor (25) is slidably fitted on the inner shaft (21). The resistor (25) can be formed in various shapes. However, in the embodiment shown in the figure, the cylindrical portion (26) slidably contacting the inner shaft portion (21) and the cylindrical portion ( 26) having a disk-shaped portion (27) extending in the radial direction, and an inner surface of the cylindrical portion (26) is provided with a hole slide plane (28) slidably contacting the shaft slide plane (23). The resistor is prevented from rotating.

  An annular groove (29) is formed on the inner surface of the main body (11) or one member of the resistor (25), and the other member is fitted into the annular groove (29) via the fluid. A working piece (30) is formed. In the embodiment shown in the figure, an annular groove (29) is formed in the cover (10) of the main body (11), and an action piece (30) is provided on the side of the disk-shaped part (27) of the resistor (25). However, it is also possible to form the annular groove on the resistor side and form the action piece on the main body side so that the annular groove side rotates. A plurality of the annular grooves and action pieces may be formed on concentric circles.

  The cylindrical portion (26) of the resistor (25) is provided with a mounting hole (31) that opens in the radial direction, and the slide plate (32) passes through the mounting hole (31) in the through hole (22). Has been inserted. In the embodiment shown in the figure, the through hole (22) opens at both ends in the radial direction, and the slide plate (32) penetrates the cylindrical portion (26) from one end to the other end in the radial direction. However, the through hole (22) may be opened only in one of the radial directions, and the slide plate may extend only on one side in the radial direction (not shown).

  An adjustment screw (34) that engages with a screw hole (33) of the slide plate (32) is rotatably mounted in the adjustment hole (24). An oil seal (35) is provided around the adjusting screw (34), and is secured by an annular retaining piece (36). A screwdriver (38) is formed in a retaining groove (38) formed in the head (37). (Not shown) or the like can be inserted and rotated.

  With the above configuration, when the sliding door is opened, even if the rack (8) and the pinion gear (7) are engaged, the rotation of the pinion gear is not transmitted to the rotating shaft (15) by the one-way clutch (16). Therefore, the resistor (25) does not rotate and no braking resistance is generated.

  When the sliding door is closed, when the rack (8) and the pinion gear (7) are engaged, the rotation is transmitted to the rotating shaft (15), and the resistor (25) rotates. At this time, since the action piece (30) is rotatably fitted in the annular groove (29) via the fluid, a braking resistance is generated, and the movement of the sliding door is braked.

  The braking resistance varies the amount of insertion of the annular groove (29) and the action piece (30) by rotating the adjusting screw (34) and moving the resistor (25) via the slide plate (32). Can be adjusted (see FIGS. 3 and 4). At the time of this adjustment, the resistor (25) moves in the axial direction in a state of being fitted to the inner shaft portion (21), so there is no risk of tilting, and the annular groove (29) and the action piece (30) can maintain an accurate fitting state and does not stop rotating smoothly.

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, such as a rotating shaft and a resistor. The longitudinal cross-sectional view of the cylindrical part of a resistor.

Explanation of symbols

6 Braking device 7 Pinion gear 11 Body 15 Rotating shaft 16 One-way clutch 21 Inner shaft portion 22 Through hole 24 Adjustment hole 25 Resistor 29 Annular groove 30 Working piece 32 Slide plate 34 Adjustment screw

Claims (4)

  A fluid is sealed in the body, a rotating shaft connected to a pinion gear through a one-way clutch is inserted into the main body, and a resistor is slidably fitted to an inner shaft portion of the rotating shaft existing in the main body. An annular groove is formed on the inner surface of the main body or one member of the resistor, and an operating piece that fits into the annular groove is formed on the other member, and the inner shaft portion is opened in the radial direction. A through hole extending in the axial direction is provided, a slide plate inserted into the through hole is connected to the resistor, and an adjustment hole is formed at one end of the rotating shaft that opens outward from the body and communicates with the through hole. Then, the adjustment screw is rotatably mounted in the adjustment hole, the adjustment screw is screw-engaged with the slide plate, and the adjustment screw is rotated to move the resistor in the axial direction along the inward shaft portion. A fluid friction resistance type braking device.   A shaft slide plane is formed on the outer surface of the inner shaft portion, and a hole slide plane is formed on the resistor so as to be in sliding contact with the shaft slide plane so as to guide the resistor in the axial direction in a non-rotating state. The fluid frictional resistance braking device according to claim 1.   2. The fluid frictional resistance braking device according to claim 1, wherein the through hole penetrates the inner shaft portion, and the slide plate is inserted into the through hole.   The fluid friction resistance type braking device according to claim 1, wherein the main body includes a case and a cover, the annular groove is formed in the cover, and the action piece is formed in the resistor.

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