Rotary damper unit and door opening / closing device equipped with the rotary damper unit

Abstract

To facilitate adjustment of rotational resistance.SOLUTION: A rotary damper unit comprises: a casing 51a; a rotation shaft 51b projecting towards one side from the casing 51a; a brake gear 51c fixed on the rotation shaft 51b; and a rotational resistance adjustment member 51d exposed on the other side of the casing 51a, capable of being rotated. The rotational resistance of the rotation shaft 51b is adjusted according to a rotation amount of the rotational resistance adjustment member 51d, and the rotational resistance adjustment member 51d is formed larger than the brake gear 51c in a radial direction.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a rotary damper unit in which the amount of rotation of a rotary shaft and a brake gear can be adjusted, and to a door opening / closing device equipped with this rotary damper unit. [Background technology]

[0002] Conventionally, there has been an invention of this type, as described in Patent Document 1, which includes a door body that is suspended by a hoist and moves in the opening width direction while rotating to open and close, and a braking device that provides resistance to the closing movement of the door body. The braking device comprises a braking gear that rotates around a horizontal axis with its teeth facing downward, a main body that adjusts the rotational resistance of the braking gear, and a rack fixed to the door body with its teeth facing upward so as to mesh with the braking gear, and the rotational resistance can be adjusted by rotating an operating part provided on the side opposite the braking gear. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-17444 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, according to the above-mentioned conventional technology, a tool such as a screwdriver is required to rotate the operating portion, and depending on the installation conditions, etc., there are cases where it is not possible to secure space for inserting the tool. [Means for solving the problem]

[0005] In view of these problems, the present invention One of The present invention has the following configuration. the braking gear is provided with a casing, a rotating shaft protruding from the casing to one side, a brake gear fixed to the rotating shaft, and a rotational resistance adjusting member exposed on the other side of the casing and rotatable, and is configured to adjust the rotational resistance of the rotating shaft by the amount of rotation of the rotational resistance adjusting member, The rotational resistance adjusting member is formed to be larger in the radial direction than the brake gear. A rotary damper unit, comprising: an anti-slip portion provided on an outer periphery of the rotational resistance adjusting member; and the anti-slip portion is formed by forming the outer periphery of the rotational resistance adjusting member into a polygonal shape. A rotary damper unit characterized by the above. Effect of the Invention

[0006] Since the present invention is configured as described above, it is possible to easily adjust the rotational resistance. [Brief description of the drawings]

[0007] [Figure 1] 1 is a front view showing an example of an opening and closing door device according to the present invention, in which a door body is in a fully closed state. [Diagram 2] 1 is a front view showing an example of an opening and closing door device according to the present invention in a fully open state of a door body. [Diagram 3] 2 is an enlarged front view of a main portion of the opening and closing door device in a fully closed state, in which a vertical intermediate portion is omitted and part of the door body is cut away. FIG. [Figure 4] FIG. 4 is an enlarged front view showing the mounting portion of the rotary damper unit, with the front cover member omitted. [Diagram 5] FIG. 4 is an enlarged vertical cross-sectional view showing a mounting portion of the rotary damper unit. [Figure 6] FIG. 13 is a view showing the rotary damper unit and the rack engaged with each other, as viewed from below. [Figure 7] 13 is a diagram showing a state in which the rotary damper unit, the adjustment member, the meshing amount adjustment portion, etc. are separated. FIG. [Figure 8] FIG. 2 is a plan view showing the rotary damper unit alone, with the rotational resistance adjusting member and bracket omitted. [Figure 9]FIG. 11 is a vertical cross-sectional view showing another example of the mounting structure of the rotary damper unit. [Figure 10] 8 is a bottom view of the rotary damper unit and the rack engaged in the mounting structure of FIG. 7. FIG. [Figure 11] 4A and 4B are diagrams illustrating the mounting state of the rotary damper unit and the inclined bracket. [Figure 12] 11A to 11C are front views sequentially showing how a door body performs a closing operation from a fully open position to a fully closed position in another example of the opening and closing door device according to the present invention, with the front cover member omitted. [Figure 13] 11A to 11D are front views sequentially showing how a door body performs a closing operation from a fully open position to a fully closed position in another example of the opening and closing door device according to the present invention, with the front cover member omitted. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] This embodiment discloses the following features. A first feature of this embodiment is that it comprises a casing, a rotating shaft protruding from the casing to one side, a brake gear fixed to the rotating shaft, and a rotatable rotational resistance adjustment member exposed on the other side of the casing, and is configured to adjust the rotational resistance of the rotating shaft depending on the amount of rotation of the rotational resistance adjustment member, and the rotational resistance adjustment member is formed to be radially larger than the brake gear (see FIGS. 6 and 7).

[0009] As a second feature, an anti-slip portion is provided on the outer periphery of the rotational resistance adjusting member (see FIG. 6).

[0010] As a third feature, the anti-slip portion is formed by forming the outer periphery of the rotational resistance adjusting member into a polygonal shape (see FIG. 6).

[0011] As a fourth feature, the rotational resistance adjusting member is larger in the radial direction than the casing (see FIG. 7).

[0012] As a fifth feature, a bracket is provided for attaching the casing to a stationary portion, and the rotational resistance adjustment member has a regulating portion that engages with the bracket when rotated a predetermined amount, thereby regulating the amount of rotation (see FIGS. 6 and 7).

[0013] As a sixth feature, the rotational resistance adjusting member is provided with a scale indicating the amount of rotation (see FIG. 6).

[0014] As a seventh feature, the opening and closing door device is provided with the above-mentioned rotary damper unit (see Figs. 1 to 6).

[0015] The eighth feature is that the opening and closing door device is provided with a door body that opens and closes while moving in the opening width direction, and the rotational resistance adjusting member is disposed above the door body (see FIG. 5).

[0016] <First embodiment> Next, the first embodiment having the above-mentioned features will be described in detail with reference to the drawings. In the following description, the term "visible direction" refers to the width direction of the frame (the left-right direction in FIG. 1). The term "visible direction" refers to the thickness direction of the frame that is approximately perpendicular to the "visible direction." Additionally, "inside the frame" refers to the inside of the frame body, and "outside the frame" refers to the outside of the frame body. In addition, the "opening width direction" means the lateral width direction of the opening that is opened and closed by the door body, and in this embodiment, is the same direction as the "finding direction." In addition, the "door thickness direction" means the direction of the thickness of the door body, which in this embodiment is the same direction as the "visible direction."

[0017] The opening and closing door device 1 is configured to open and close, in the width direction, an opening A that penetrates a structural wall of a building or the like in a vertically long rectangular shape (see Figs. 1 and 2). This opening / closing door device 1 is a sliding door device that includes a door body 10 that moves in the opening width direction to open and close the opening A, a door-end side vertical frame 20 that faces the door end of the door body 10, a lower rail 31 that guides the door body 10 in the opening and closing direction from below, and a transom 40 that covers the upper end side of the door body 10. A braking device 50 that slows down the closing speed of the door body 10 is provided inside the transom 40. Also, an automatic closing device 60 that pulls the open door body 10 in the closing direction to automatically close it is provided on the door end side at the top inside the door body 10 (see Figure 3).

[0018] The door body 10 includes a front plate 11 and a back plate 12 (see FIG. 5) that are spaced apart in the door thickness direction and are generally parallel to each other, and a plurality of frames that fix the front plate 11 and the back plate 12 together on the inside.

[0019] Among the multiple aggregates, the uppermost aggregate is a horizontal aggregate 13 that extends over substantially the entire length in the lateral direction of the door body 10. According to an example shown in Fig. 5, this horizontal aggregate 13 is formed in a crank-like vertical cross section, having a flat plate portion 13a that is substantially horizontal in the door thickness direction, an upper protruding piece portion 13b that protrudes upward from the front end of this flat plate portion 13a, and a lower protruding piece portion 13c that protrudes downward from the back end of the flat plate portion 13a.

[0020] The upper surface of the flat plate portion 13a supports a rack 52 constituting a braking device 50 described later, a hoist 14 which suspends the door body 10 and rolls on the upper rail 46 within the transom 40, and the like.

[0021] The hoist 14 is supported at the upper end of the door body 10 on the door front side via a bracket 15 or the like so that it can rotate around an axis in the door thickness direction, and protrudes upward from the door body 10 and engages with the upper rail 46. In a preferred example of this embodiment, a single hoist 14 is provided for one bracket 15 in order to reduce contact resistance with the upper rail 46. As another example, it is also possible to adopt an embodiment in which a plurality of hoists 14 are supported by one bracket 15.

[0022] In addition, a groove 16 that opens downward is provided in the door width direction at the lower end side of the door body 10 (see FIG. 3). A carriage 17 is supported in the groove 16 so as to protrude downward from the door trailing end part of the door body 10. This undercarriage 17 is rotatably supported by a bearing bracket 17 a fixed to the inner surface of the recessed groove 16 , and rolls on the lower rail 31 .

[0023] In addition, reference numeral 18 in Figs. 1 and 2 denotes a handle for opening and closing the door body 10, and reference numeral 19 denotes a keyhole or thumb turn of a locking device.

[0024] The door-end vertical frame 20 is a long, columnar member that continues in the vertical direction and is fixed to the wall surface of the main body so as to fit along the left edge of the opening A. This door-end vertical frame 20 has a continuous groove in the vertical direction on the surface facing the door body 10 so that the door end of the door body 10 fits into it.

[0025] The lower rail 31 is fixed to a lower immovable surface F (e.g., a floor surface, the ground, a door slide, etc.) of the door body 10. The lower rail 31 protrudes from the lower immovable surface F and extends in a continuous, long shape in the door body opening and closing direction. One end of the lower rail 31 is located closer to the tail end of the door body 10 when it is in the fully closed position (see Figure 1) and closer to the door tip than the lower carriage 17, and the other end of the lower rail 31 is located closer to the tail end of the door body 10 when it is in the fully open position (see Figure 2) and closer to the tail end than the lower carriage 17.

[0026] In addition, on the lower stationary surface F, a lower anti-sway member 32 is provided on the door tip side of the lower rail 31. This lower anti-sway member 32 is a roller supported on the lower stationary surface F so as to rotate around an axis in the vertical direction, and is loosely fitted in the recessed groove 16 to suppress the lower end side of the door body 10 from swinging in the door thickness direction.

[0027] The transom 40 is configured to be long in the width direction so as to cover the upper end portion of the door body 10 in the fully closed state over the entire length in the opening and closing direction. As shown in Figure 5, the transom 40 comprises a base member 41 that supports an upper rail 46 and a rotary damper unit 51, etc., a fastening bracket 42 for fastening the base member 41 to a wall W, a top plate 43 that covers the upper end of the door body 10 and the upper rail 46, etc., a removable front cover member 44 that covers the upper end side of the door body 10 and the hoist 14, etc. from the front side, and a back cover member 45 that covers the rotary damper unit 51 from the rear (indoor side).

[0028] In Figure 5, symbol 21 denotes a vertical frame member that covers the edge of the opening A on the door end side in the vertical direction, symbol 22 denotes an upper frame member that covers the upper edge of the opening A, and symbol 23 denotes an airtight material that elastically contacts the back surface of the upper end of the door body 10 in the opening and closing direction.

[0029] The base member 41 is located at a predetermined distance from the rear side (indoor side) of the door body 10 in the fully closed position. The base member 41 has a substantially vertical flat base plate portion 41a. The base plate portion 41a is elongated and continuous across the width of the opening. An upper rail 46 is fixed to the front surface of the base plate portion 41a. A cutout portion 41a1 is provided on the surface of the base plate portion 41a below the upper rail 46. A rotary damper unit 51 is inserted into the base plate portion 41a.

[0030] The upper end side of the base member 41 is bent into an appropriate shape and is fixed integrally to the fastening bracket 42 and the top plate 43, etc. The fastening bracket 42 is then fixed to the wall portion W. Therefore, this base member 41 functions as an immovable part that is immovable with respect to the door body 10 that moves in the opening width direction. The means for fastening the base member 41 to the fastening bracket 42 and the means for fixing the fastening bracket 42 to the wall W may be well-known fastening means such as screws, rivets, welding, etc.

[0031] The top plate 43 and the front cover member 44 are provided long in the opening and closing direction so as to cover the upper end side of the door body 10 in the fully closed state.

[0032] The rear cover member 45 is provided on the rear side (back side) of the braking device 50 in the opening and closing direction, and prevents foreign matter resulting from the collapse, etc. from adhering to the braking device 50, etc., described later, if the surface of the wall portion W collapses due to deterioration over time, etc. The rear cover member 45 in the illustrated example is formed in an inverted L-shape in vertical cross section, covering the rear portion of the rotary damper unit 51 from the rear to the top side. This rear cover member 45 may be provided at least partially so as to be located on the rear side of the braking device 50, but may also be provided so as to extend over the entire length of the interlining 40 in the lateral width direction.

[0033] In addition, some or all of the multiple components that make up the outer part of the transom 40, such as the base member 41, the fastening bracket 42, the top plate 43, the front cover member 44, and the back cover member 45, can be constructed as a single unit.

[0034] The wall W is a wall of the structure of a building or the like in which the opening / closing door device 1 is to be installed. A cutout w1 is partially formed in the wall W so as to fit into the rear cover member 45. It is also possible to omit the cutout w1 by reducing the amount of protrusion of the rear cover member 45 toward the indoor side.

[0035] An upper rail 46 is provided on the base member 41 so as to protrude from the base member 41 to one side in the door thickness direction (to the outside side in the illustrated example) and to continue in the opening width direction. The upper rail 46 is a long member with an approximately L-shaped vertical cross section that continues in the opening width direction, with one vertical end attached to the base member 41 and the other end protruding horizontally from the base member 41 on which the hoist 14 is placed and engaged (see Figure 5). The length of the upper rail 46 is set so as to include the range in which the hoist 14 moves in conjunction with the opening and closing operation of the door body 10.

[0036] The braking device 50 comprises a rotary damper unit 51 provided on a stationary portion (base member 41 in the illustrated example) with the teeth of a braking gear 51c facing sideways, and a rack 52 provided on the door body 10 so as to mesh with the teeth of the braking gear 51c. Between the rotary damper unit 51 and the stationary portion, a meshing amount adjustment portion 53 for adjusting the meshing amount between the braking gear 51c and the rack 52 is provided.

[0037] As shown in FIG. 7, the rotary damper unit 51 includes a casing 51a, a rotating shaft 51b protruding downward from the casing 51a, a braking gear 51c fixed to the rotating shaft 51b, a rotational resistance adjustment member 51d exposed on the upper side of the casing 51a, and a bracket 51f for attaching the casing 51a to a stationary portion, and is configured to adjust the rotational resistance of the rotating shaft 51b in accordance with the amount of rotation (rotation angle) of the rotational resistance adjustment member 51d.

[0038] The casing 51a is integrally formed of a substantially cylindrical main body portion 51a1 closed on both axial sides and a fastening flange portion 51a2 located on the upper side of the main body portion 51a1, with a rotating shaft 51b protruding on one axial side and a rotating operating portion 51e (see Figures 7 and 8) exposed on the other side. Inside this casing 51a, there are provided a rotor that rotates integrally with the rotating shaft 51b, a viscous fluid that applies rotational resistance to this rotor, and a mechanism that adjusts the rotational resistance according to the amount of rotation of the rotation operation part 51e. This mechanism applies resistance to the rotation of the rotating shaft 51b in one direction (in the illustrated example, the direction corresponding to the closing direction of the door body 10) and releases the resistance when the rotating shaft 51b rotates in the opposite direction. Note that a one-way type rotary damper mechanism with a well-known structure can be applied to these.

[0039] The brake gear 51c is formed in the shape of a spur gear having teeth on its outer periphery. The teeth of the brake gear 51c mesh with the teeth of the rack 52.

[0040] In the illustrated example, the rotation operation unit 51e is formed by forming a plurality of recesses (two in the illustrated example) on the end face of a rotatable shaft portion exposed on the upper surface side of the casing 51a. This rotation operation unit 51e is connected to a rotation resistance adjustment mechanism (not shown) in the casing 51a. This rotation resistance adjustment mechanism is configured to gradually increase the rotation resistance of the rotating shaft 51b according to the amount of rotation of the rotation operation unit 51e in one direction, and to gradually decrease the rotation resistance of the rotating shaft 51b according to the amount of rotation of the rotation operation unit 51e in multiple directions.

[0041] The rotational resistance adjustment member 51d is located on the upper side of the casing 51a, and is formed in a generally disk shape that is radially larger than the brake gear 51c and larger than the main body portion 51a1 of the casing 51a.

[0042] A plurality of operation shafts 51d2 are provided protruding around the center of the lower surface of the rotational resistance adjustment member 51d. These operation shafts 51d2 fit into rotation operation parts 51e (more specifically, a plurality of recesses) on the upper surface of the casing 51a.

[0043] A rotation support shaft 51d3 is provided to protrude from the center of the upper surface of the rotation resistance adjustment member 51d. This rotation support shaft 51d3 fits into a bracket 51f to rotatably support the rotation resistance adjustment member 51d.

[0044] A single shaft-shaped restricting portion 51d4 protrudes from the periphery of the upper surface of the rotational resistance adjusting member 51d. When the rotational resistance adjusting member 51d rotates a predetermined amount, the restricting portion 51d4 abuts against a contact portion 51f11 (see FIG. 6) of the bracket 51, thereby restricting the amount of rotation of the rotational resistance adjusting member 51d.

[0045] Further, an anti-slip portion is provided on the outer periphery of the rotational resistance adjustment member 51d. According to a preferred example shown in FIG. 6, this anti-slip portion is a polygonal outer periphery of the rotational resistance adjustment member 51d.

[0046] As other examples of the anti-slip portion, a convex portion or a concave portion may be formed on the outer periphery of the rotational resistance adjustment member 51d, or an anti-slip elastic body (rubber, elastic resin, etc.) may be provided on the outer periphery of the rotational resistance adjustment member 51d.

[0047] Scales 51d1 indicating the amount of rotation are provided on the lower surface of the rotational resistance adjustment member 51d as necessary (see FIG. 6). Each scale 51d1 is formed as a straight line extending in the radial direction by printing, engraving, etc. A large number of these scales 51d1 are provided at equal intervals in the circumferential direction. An operator or the like adjusting the rotary damper unit 51 can visually check the scale 51d1 and the edge of the rotation operation part 51e, and can grasp the amount of rotation of the rotational resistance adjustment member 51d from the positional relationship between them.

[0048] Moreover, the rotational resistance adjusting member 51d having the above-mentioned structure is located above the upper end of the door body 10 (see FIG. 5). This arrangement reduces the possibility that the door body 10 will become an obstacle when an operator or the like performs the adjustment work of the rotation resistance adjustment member 51d, thereby improving the ease of the adjustment work.

[0049] The bracket 51f integrally includes a case side fastening piece 51f1 that is fastened to the flange portion 51a2 of the casing 51a, and a base side fastening piece 51f2 that is fastened to the base member 41 via an engagement amount adjustment portion 53 (see FIGS. 4 to 7). In FIG. 7, reference numeral 51g denotes a cylindrical spacer for ensuring a gap between the casing 51a and the bracket 51f to allow the rotational resistance adjustment member 51d to rotate. Furthermore, reference numeral 51h denotes a fastener (for example, a bolt, a screw, a rivet, or the like) that is inserted through the flange portion 51a2 and the spacer 51g and fastened to the bracket 51f to fix the casing 51a to the bracket 51f.

[0050] The case side fastening piece 51f1 is provided with an axis hole 51f12 for inserting the rotation support axis 51d3, fastening holes 51f13 for fastening fasteners 51h (for example, bolts, screws, rivets, etc.) (see FIG. 7). In addition, the side of the case side fastening piece 51f1 is provided with abutment portions 51f11 that come into contact with the regulating portion 51d4 when rotated and regulate the rotation range of the rotation resistance adjustment member 51d. The abutment portions 51f11 are formed in a concave shape in plan view on the indoor side and the outdoor side of the case side fastening piece 51f1 so as to correspond to one side and the other side in the rotation direction of the rotation resistance adjustment member 51d (see the dashed line in FIG. 6). The abutment portions 51f11 at these locations regulate the rotation angle of the rotation resistance adjustment member 51d.

[0051] The base-side fastening piece 51f2 is provided with a plurality of through holes 51f22 for inserting the screw members 51j (see FIG. 5). These screw members 51j fit into spacers 53a, which will be described later.

[0052] The rack 52 is fixed to the upper side of the rear surface of the door body 10, closer to the door tail than the hoist 14, with the teeth arranged in a straight line facing the brake gear 51c. More specifically, as shown in FIG. 5, a bracket 54 is fixed to the upper end of the door body 10, continuing in the width direction of the opening, and a rack 52 is fitted and fixed to this bracket 54. As another example, the rack 52 may be fixed directly to the upper end of the door body 10, or the rack 52 may be fixed directly or indirectly to the rear surface of the door body 10, etc.

[0053] The meshing amount adjustment portion 53 is configured by sandwiching one or more spacers 53a between the base member 41, which is a stationary portion, and the bracket 51f of the rotary damper unit 51. This meshing amount adjustment portion 53 adjusts the position of the rotary damper unit 51 in the projection direction by attaching and detaching a spacer 53a.

[0054] The spacer 53a is formed in a substantially flat plate shape so as to be inserted between the base member 41 and the base side fastening piece 51f2 of the bracket 51f from the door front side toward the door rear side, and has a notch 53a1 on the insertion direction side that fits with the screw shafts of multiple (two in the illustrated example) screw-fitting members 51j, and has a positioning piece 53a2 bent into an L shape at the end opposite the insertion direction so as to contact the end of the base side fastening piece 51f2 (see Figure 4).

[0055] The automatic closing device 60 is configured such that one end of a wire 61, the other end of which is fixed to a fixed portion within the eyelet 40, is wound up by a reel 62 having a power spring therein (see FIG. 3). According to this automatic closing device 60, the door body 10 in an open state automatically performs a closing operation from the fully open position (see FIG. 2) to the fully closed position (see FIG. 1).

[0056] 3, reference numeral 71 denotes a fastening portion which is a fixed portion to which one end of the wire 61 is fastened, reference numeral 72 denotes a vibration prevention member which prevents the upper side of the door body 10 from swinging in the thickness direction, and reference numeral 73 denotes a door stop member which receives the bracket 15 of the hoist 14 when the door body 10 is fully opened. The fastening portion 71, the vibration prevention member 72, and the door stop member 73 are configured as an integrated assembly and are fixed to the base member 41.

[0057] Next, the characteristic functions and effects of the opening and closing door device 1 having the above configuration will be described in detail. According to the opening and closing door device 1, since the rotary damper unit 51 and the rack 52 are arranged in the horizontal direction, it is not necessary to make the transom 40 large in the vertical direction. In other words, the vertical dimension of the transom 40 can be reduced. In particular, according to a preferred example of this embodiment, the rotary damper unit 51 is positioned further forward than the base member 41, thereby reducing the number of components within the interlocking member 40 that are further behind the base member 41, thereby making it possible to further reduce the vertical dimension of the interlocking member 40.

[0058] Furthermore, according to the opening and closing door device 1, the degree of meshing between the brake gear 51c and the rack 52 can be easily adjusted by inserting or removing the spacer 53a, which in turn prevents the resistance due to the meshing between the brake gear 51c and the rack 52 from becoming too large or prevents tooth skipping between the brake gear 51c and the rack 52.

[0059] In addition, according to the opening and closing door device 1, since no hoist is provided on the door trailing end side of the door body 10, the braking device 50 can be arranged without having to consider interference with the hoist on the door trailing end side, and furthermore, the maintenance of the braking device 50 is easy. For example, since the rotational resistance adjustment member 51d is exposed to the outside, an operator can easily adjust the rotational resistance of the rotary damper unit 51 by rotating the rotational resistance adjustment member 51d by hand. In this case, the corners on the outer periphery of the polygonal rotational resistance adjustment member 51d function as anti-slip portions, making the adjustment easy to do. The adjustment can be done without removing the front cover member 44, but it can be done more easily if the front cover member 44 is removed.

[0060] Moreover, in the opening and closing door device 1, the rotary damper unit 51 and its braking gear 51c (pinion gear) are provided on the side of the non-moving interlocking door 40, and the rack 52 is provided on the side of the moving door body 10. Therefore, the rotary damper unit 51 is stable without rattling, and the safety of the above-mentioned maintenance work etc. can be ensured.

[0061] When the opening and closing door device 1 is released at the fully open position, it starts the closing operation by being pulled by the wire 61 of the automatic closing device 60. In the latter half of the closing operation, when the rack 52 on the upper end side of the door body 10 engages with the rotary damper unit 51 on the immovable portion side, the closing speed of the door body 10 is appropriately reduced. Then, the door body 10 performs a further closing operation, and when the rack 52 is positioned further in the closing direction than the rotary damper unit 51, the door body 10 reaches the fully closed state shown in FIG.

[0062] In addition, when the door body 10 is opened from the fully closed position by, for example, moving the hand gripping the handle 18 in the opening direction, the door body 10 opens to the fully open position with almost no resistance from the braking device 50, since the rotary damper unit 51 is a one-way type rotary damper.

[0063] <Second embodiment> Next, other embodiments of the present invention will be described. The embodiments shown below are partial modifications of the above-mentioned opening and closing door device 1, so the modifications will be mainly described in detail.

[0064] The opening / closing door device 2 shown in Figures 9 to 11 is configured by replacing the base member 41 with a base member 47, replacing the bracket 51f with a bracket 51i, eliminating the rotational resistance adjustment member 51d, and replacing the meshing amount adjustment portion 53 with a meshing amount adjustment portion 55, compared to the above-mentioned opening / closing door device 1.

[0065] The base member 47 has, on its upper side, a base plate portion 47a to which the upper rail 46 is fastened, and, below this base plate portion 47a, a fastening piece portion 47b to which the rotary damper unit 51 is fastened.

[0066] The base plate portion 47a is formed in a long vertical flat plate shape along the upper rail . The fastening piece 47b is formed in a vertical flat plate shape by bending the lower side of the base plate 47a in a crank shape toward the indoor side. The fastening piece 47b may be formed partially in the opening width direction or may be formed over the entire length of the base plate 47a.

[0067] The bracket 51i integrally has a horizontal case side fastening piece 51i1 that is fastened to the casing 51a of the rotary damper unit 51, and a vertical base side fastening piece 51i2 that is fastened to the base plate portion 47a via an engagement amount adjustment portion 55. The base-side fastening piece 51i2 has an elongated hole 51i21 for inserting the fastening tool 55b along the inclined bracket 55a. The fastening tool 55b is therefore movable along the elongated hole 51i21 in the extension direction of the inclined bracket 55a.

[0068] The meshing amount adjustment portion 55 is provided with an inclined bracket 55a extending so as to be inclined with respect to the extension direction of the rack 52, and the position of the rotary damper unit 51 in the projected direction changes depending on the fastening position of the bracket 51i relative to this inclined bracket 55a.

[0069] The inclined bracket 55a has one end side and the other end side of an inclined piece 55a1 inclined with respect to the extending direction of the rack 52, and is fixed to the base member 47 by fasteners (for example, screws, bolts, rivets, etc.).

[0070] The inclined piece 55a1 is provided with a plurality of fastening portions 55a11 spaced apart in the extending direction. Each of the fastening portions 55a11 is a screw hole into which a threaded portion of a detachable fastener 55b (for example, a screw or a bolt) inserted into the bracket 51i can be screwed.

[0071] Therefore, according to the opening and closing door device 2 configured as above, by selectively fastening the bracket 51i to the multiple fastening portions 55a11, the position of the rotary damper unit 51 in the approach / removal direction relative to the rack 52 can be adjusted with high precision. That is, for example, if multiple selectable fastening holes are provided in a prospective direction perpendicular to the rack 52 (left and right direction in FIG. 10), the pitch between adjacent fastening holes becomes too wide, making it impossible to precisely adjust the position of the rotary damper unit 51. However, according to the above configuration, multiple fastening portions 55a11 are provided on the inclined piece 55a1, and the fastener 55b that fastens the rotary damper unit 51 to the inclined bracket 55a is movable within the elongated hole 51i21 (see FIG. 11), so that the position of the rotary damper unit 51 can be precisely adjusted.

[0072] Moreover, in the opening and closing door device 2, when adjusting the rotation resistance of the rotary damper unit 51, the rotary damper unit 51 is removed from the inclined bracket 55a and the rotation operation part 51e is rotated. Incidentally, in the same manner as in the opening / closing door device 1, it is also possible to provide this opening / closing door device 2 with a rotation resistance adjusting member 51d.

[0073] <Third embodiment> The opening / closing door device 3 shown in Figs. 12(a) to (c) is the above opening / closing door device 1, in which the braking device 50 is replaced with a braking device 50'.

[0074] The braking device 50' includes a single rotary damper unit 51 and a plurality of racks 52 (two in the illustrated example) arranged in the door width direction.

[0075] A plurality of racks 52 are fixed to the upper side of the rear surface of the door body 10. According to the illustrated example, of the two racks 52, the rack 52 on the door front side meshes with the braking gear 51c of the rotary damper unit 51 when the door body 10 closes the opening A about halfway (see FIG. 12(b)). Then, when the door body 10 performs a further closing operation, the rack 52 on the door trailing end side meshes with the brake gear 51c (see FIG. 12(c)), and this meshed state continues until the door body 10 is fully closed.

[0076] When the door body 10 is opened, the resistance of the one-way type rotary damper unit 51 is released.

[0077] Therefore, according to the opening and closing door device 3 shown in FIG. 12, during the closing operation of the door body 10, resistance can be applied to the closing operation over a comparatively long range.

[0078] As an example other than the illustrated example, it is possible to provide three or more racks 52. Also, a plurality of racks 52 arranged in a straight line may be connected to form an integrated structure.

[0079] <Fourth embodiment> The opening / closing door device 4 shown in Figs. 13(a) to (d) is the above-mentioned opening / closing door device 1, in which the braking device 50 is replaced with a braking device 50''.

[0080] The braking device 50 ″ includes a single rack 52 and a plurality of (two in the illustrated example) rotary damper units 51 arranged at intervals in the opening width direction.

[0081] The rack 52 is fixed to the upper side of the rear surface of the door body 10 near the door tip.

[0082] According to the illustrated example, one of the rotary damper units 51 is positioned toward the opening direction of the opening A, and engages with the rack 52 immediately after the door body 10 has completed the closing operation (see FIG. 13(b)), thereby receiving resistance from the one of the rotary damper units 51. When the rack 52 passes through the one rotary damper unit 51 in the closing direction, the rack 52 is released from the braking force applied by the one rotary damper unit 51.

[0083] After that, when the door body 10 approaches the fully closed position, the rack 52 meshes with the other rotary damper unit 51 (see FIG. 13(c)) and receives resistance from the other rotary damper unit 51. The braking by the other rotary damper unit 51 continues until the door body 10 is fully closed.

[0084] Therefore, according to the opening and closing door device 4 shown in Figure 13, the door body 10, which performs a closing operation from the fully open position to the fully closed position, can be braked at the beginning of the closing operation, the brake can be released in the middle stage, and the brake can be applied again at the end stage.

[0085] When the door body 10 performs an opening operation, the resistance of the two rotary damper units 51 is released.

[0086] As an example other than the illustrated example, it is possible to provide three or more rotary damper units 51 in the opening width direction, or to provide multiple rotary damper units 51 and multiple racks 52.

[0087] <Other Modifications> In the above embodiment, the rotational resistance adjustment member 51d is configured to rotate continuously. However, as another example, the rotational resistance adjustment member 51d may be configured to rotate intermittently, in other words, the rotational resistance adjustment member 51d may be configured to be locked every time it rotates a predetermined amount. More specifically, a ratchet gear may be provided on the outer periphery of the rotational resistance adjustment member 51d, and a ratchet portion that engages with and disengages from the ratchet gear may be provided around the circumference of the rotational resistance adjustment member 51d. With this configuration, the ratchet portion engages with and disengages from the ratchet wheel every time the rotational resistance adjustment member 51d is rotated a predetermined amount. Therefore, an operator or the like can easily grasp the amount of rotation of the rotational resistance adjustment member 51d from the number of times the engagement and disengagement occur.

[0088] In addition, in the above embodiment, as a particularly preferred example, the rotational resistance adjustment member 51d is positioned above the door body 10. However, as an example other than the illustrated example, it is also possible to position the rotational resistance adjustment member 51d below the upper end of the door body 10, below the brake gear 51c, etc.

[0089] Furthermore, according to the above embodiment, the rotary damper unit 51 is fixed to the wall W via an intermediate member such as the base member 41, but as another example, the rotary damper unit 51 can also be fixed directly to the wall W.

[0090] Furthermore, according to the above-mentioned opening and closing door device 1 (see FIG. 1), the rotary damper unit 51 is positioned corresponding to the end of the door body 10 in the closed state, but this rotary damper unit 51 can also be positioned corresponding to the center or end of the door body 10 in the closed state, so long as it is positioned closer to the end of the door than the hoist 14.

[0091] In addition, according to the above embodiment, the braking device 50 is provided to slow down the closing speed of the door body 10, but as another example, it is also possible to slow down the opening speed of the door body 10, or to slow down both the closing speed and opening speed of the door body 10. In order to reduce the opening speed of the door body 10, a one-way type rotary damper mechanism that generates rotational resistance in the opposite direction to that described above may be used in the rotary damper unit 51. In order to reduce both the closing speed and the opening speed of the door body 10, a rotary damper mechanism that generates rotational resistance in both directions may be used in the rotary damper unit 51.

[0092] In addition, according to the above embodiment, the rotary damper unit 51 is provided in a fixed position and the rack 52 is provided in the door body 10, but as another example, it is also possible to provide the rack 52 in a fixed position and the rotary damper unit 51 in the door body 10, on the contrary.

[0093] Furthermore, according to the above embodiment, a sliding door device is configured in which the door body 10 is guided by the upper rail 46 and the lower rail 31 etc. to open and close in the opening width direction. However, the basic structure of the above-mentioned braking device 50 etc. can be applied to opening and closing door devices other than the illustrated example which move the door body in the opening width direction to open and close, such as a sliding door device which guides the door body by only one of the upper and lower rails to open and close in the opening width direction, a folding door device which opens and closes by folding and unfolding the door body, and a balanced door device which opens and closes by moving the door body on the door front side in the opening width direction while rotating it.

[0094] Furthermore, the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the gist of the present invention. [Explanation of symbols]

[0095] 1,2,3,4: Door opening and closing device 10: Door body 14: Hanging wheel 15: Bracket 17: Get off 31: Lower rail 41,47: Base member (immovable part) 41a1: Notch 46: Upper rail 50,50',50": Braking device 51: Rotary damper unit 51a: Casing 51b: Rotating shaft 51c: Braking gear 51d: Rotational resistance adjustment member 51d1: Scale 51d4: Regulation Department 52: Rack 53: Engagement amount adjustment part 53a: Spacer 55a: Inclined bracket 55a11: Attached part W: Wall (immovable part)

Claims

1. the braking gear is provided with a casing, a rotating shaft protruding from the casing to one side, a brake gear fixed to the rotating shaft, and a rotational resistance adjusting member exposed on the other side of the casing and rotatable, and is configured to adjust the rotational resistance of the rotating shaft by the amount of rotation of the rotational resistance adjusting member, The rotational resistance adjustment member is a rotary damper unit that is formed to be larger in a radial direction than the braking gear, The rotational resistance adjusting member has an outer periphery provided with an anti-slip portion, The rotary damper unit according to claim 1, wherein the anti-slip portion is formed by forming an outer periphery of the rotational resistance adjusting member into a polygonal shape.

2. A device comprising: a casing; a rotating shaft protruding from said casing to one side; a braking gear fixed to said rotating shaft; and a rotational resistance adjusting member exposed on the other side of said casing and rotatable, said device being configured to adjust the rotational resistance of said rotating shaft according to the amount of rotation of said rotational resistance adjusting member; The rotational resistance adjustment member is a rotary damper unit that is formed to be larger in a radial direction than the braking gear, A bracket is provided for attaching the casing to a stationary part, The rotary damper unit according to claim 1, wherein the rotational resistance adjusting member has a regulating portion that engages with the bracket when the rotational resistance adjusting member rotates a predetermined amount to regulate the amount of rotation.

3. A device comprising: a casing; a rotating shaft protruding from said casing to one side; a braking gear fixed to said rotating shaft; and a rotational resistance adjusting member exposed on the other side of said casing and rotatable, said device being configured to adjust the rotational resistance of said rotating shaft according to the amount of rotation of said rotational resistance adjusting member; The rotational resistance adjustment member is a rotary damper unit that is formed to be larger in a radial direction than the braking gear, A rotary damper unit according to claim 1, wherein the rotational resistance adjusting member is provided with a scale indicating an amount of rotation.

4. A rotary damper unit as described in any one of claims 1 to 3, characterized in that the rotational resistance adjustment member is radially larger than the casing.

5. A door opening / closing device equipped with a rotary damper unit described in any one of claims 1 to 4.

6. A door opening / closing device having a door body that opens and closes while moving in the opening width direction, characterized in that the rotational resistance adjustment member is arranged above the door body.

7. A door opening / closing device comprising a door body that moves in the opening width direction to open and close an opening, and a rotary damper unit that is provided in a fixed portion above the opening and that reduces the closing speed of the door body, the rotary damper unit includes a casing, a rotating shaft protruding downward from the casing, a braking gear fixed to the rotating shaft, and a rotatable rotational resistance adjustment member exposed on an upper side of the casing, and is configured to adjust the rotational resistance of the rotating shaft by the amount of rotation of the rotational resistance adjustment member; The opening and closing door device, wherein the rotational resistance adjusting member is formed to be radially larger than the brake gear and the casing.

8. A door opening and closing device as described in claim 7, characterized in that the rotational resistance adjustment member is located above the upper end of the door body.

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