Door opening assistance device

Abstract

To reduce a size of a door opening assistance device.SOLUTION: The door opening assistance device comprises: a motor having a driving gear provided on an output shaft; a plurality of driven gears that transmits a driving force of the driving gear; and a converter that converts the driving force of an output-side driven gear among the plurality of driven gears into a force that opens a door. The converter has at least a rack gear. The rack gear advances / retreats in a prescribed direction by rotation of the plurality of driven gears. The converter converts a propulsion force of the rack gear in the prescribed direction into the force in a direction intersecting with the prescribed direction. The direction in which a shaft core of the output shaft of the motor extends intersects with the direction in which the shaft core in the plurality of driven gears extends.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a door opening assistance device. [Background technology]

[0002] In recent years, apartment buildings and other collective housing have become more airtight indoors, and the difference in air pressure between the inside and outside of the building increases when fans are turned on, so there is a risk that excessive force is required to open the door. For example, when the fan is turned on, a force of about 300 N is required to open the door of a collective housing unit, and in such a situation, it may be difficult for a child to open the door.

[0003] In order to solve the above problem, there is a door opening assist device (see, for example, Patent Document 1). When there is a relatively large difference in pressure between the inside and outside of the room, the door opening assist device forms a gap between the door frame and the door to initially open the door, eliminating the pressure difference and making it easier to open the door. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-208414 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the door opening assist device described in Patent Document 1 has a risk of becoming large in size because it includes a plurality of arms and the like.

[0006] The present invention has been made in view of the above, and has an object to reduce the size of a door opening assistance device. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, the door opening assistance device of the present invention comprises a motor having a drive gear provided on an output shaft, a plurality of driven gears which transmit the drive force of the drive gear, and a conversion unit which converts the drive force of the output side driven gear among the plurality of driven gears into a force to open the door, the conversion unit having at least a rack gear which advances and retreats in a predetermined direction by the rotation of the plurality of driven gears, the conversion unit converts the propulsive force of the rack gear in a predetermined direction into a force in a direction intersecting the predetermined direction, and the direction in which the axis of the output shaft of the motor extends intersects with the direction in which the axis of the plurality of driven gears extend. Effect of the Invention

[0008] According to one aspect of the door opening assistance device of the present invention, the door opening assistance device can be made smaller in size. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a perspective view showing a receiving portion of the door-opening assistance device according to the first embodiment. [Diagram 2] 2 is a perspective view showing a state in which the receiving portion shown in FIG. 1 is removed from the door frame. [Diagram 3] 2 is a perspective view of the door shown in FIG. 1 with the indoor exterior member located on the indoor side omitted, exposing the device body 10 of the door-opening assistance device 1. FIG. [Figure 4] 4 is a perspective view showing each part of the device body in the door-opening assistance device shown in FIG. 3. [Diagram 5] FIG. 2 is a bottom view showing the initial state of the door opening assistance device according to the present embodiment. [Figure 6] FIG. 2 is an exploded perspective view of the door opening assistance device according to the embodiment. [Figure 7] FIG. 2 is a plan view showing an initial opening state of the door opening assistance device according to the present embodiment. [Figure 8] FIG. 2 is a bottom view showing the initial opening state of the door opening assistance device according to the present embodiment. [Figure 9] FIG. 11 is a bottom view showing the initial state of the door opening assistance device according to the second embodiment. [Figure 10] 10 is a bottom view showing the initial opening state of the door-opening assist device shown in FIG. 9. FIG. [Figure 11] 10 is a bottom view showing elastic restoring forces generated in two conversion lever biasing members in the initial release state shown in FIG. 9. [Figure 12] FIG. 11 is a perspective view showing a door-opening assistance device according to a third embodiment. [Figure 13] 13 is a perspective view showing a device body of the door-opening assistance device shown in FIG. 12.

[0010] Hereinafter, the door opening assistance device according to the embodiment will be described with reference to the drawings. Note that the present invention is not limited to the embodiment shown below. In addition, the dimensional relationship of each element in the drawings, the ratio of each element, etc. may differ from the reality. The drawings may also include parts with different dimensional relationships and ratios. In principle, the contents described in one embodiment are similarly applied to other embodiments.

[0011] (First embodiment) FIG. 1 is a perspective view showing the receiving portion 14 of the door opening assistance device 1 according to the first embodiment. FIG. 2 is a perspective view showing the state in which the receiving portion 14 shown in FIG. 1 is removed from the door frame 12. FIG. 3 is a perspective view showing the device body 10 of the door opening assistance device 1 exposed by omitting the indoor exterior member 111 located on the indoor side in the door 11 shown in FIG. 1. FIG. 4 is a perspective view showing each part of the device body 10 in the door opening assistance device 1 shown in FIG. 3. FIG. 5 is a bottom view showing the initial state of the door opening assistance device 1 according to this embodiment. FIG. 6 is an exploded perspective view of the door opening assistance device 1 according to this embodiment. FIG. 7 is a plan view showing the initial opening state of the door opening assistance device 1 according to this embodiment. FIG. 8 is a bottom view showing the initial opening state of the door opening assistance device 1 according to this embodiment. In addition, in FIG. 3 and FIG. 6, a part of the output shaft 52 described later is cut out for convenience of explanation. In addition, in FIG. 4 to FIG. 6 and FIG. 8, an operation button 81 described later is omitted for convenience of explanation. For ease of explanation, the receiving portion 14 is omitted in Fig. 3. Furthermore, for ease of explanation, a cylindrical portion 82c, which will be described later, is omitted in Fig. 8.

[0012] 1 to 8, X is the width direction of the door opening assist device 1. Y is the front-rear direction of the door opening assist device 1. Z is the up-down direction of the door opening assist device 1. Y1 is the rear in the front-rear direction Y. Y2 is the front in the front-rear direction Y. When the door 11 in a closed state is pushed forward Y2, toward the outside of the room, the door 11 opens. In the door opening assist device 1 according to this embodiment, the width direction X, the front-rear direction Y, and the up-down direction Z are mutually perpendicular.

[0013] The door-opening assist device 1 according to this embodiment opens the door 11 relative to the door frame 12 to form a small gap between the door frame 12 and the door 11, thereby putting the door 11 into an initial open state, which will be described later. Such a door-opening assist device 1 is composed of, for example, a device main body 10 attached to the door 11 and a receiving part 14 attached to the door frame 12.

[0014] The device main body 10 is disposed inside the door 11. More specifically, the device main body 10 is disposed in an internal space 11s of the door 11 formed by an indoor exterior member (first exterior member) 111 shown in FIG. 1 and an outdoor exterior member (second exterior member) 112 shown in FIG. 3. However, as shown in FIG. 2, a contact portion 754 described later is exposed to the indoor side from a through hole 111h1 formed in the indoor exterior member 111. Also, as shown in FIGS. 1 and 2, an operation button 81 described later is exposed to the indoor side from a through hole 111h2 formed in the indoor exterior member 111. The receiving portion 14 is disposed, for example, on the indoor side.

[0015] The door 11 rotates between a closed state in which the opening of the door frame 12 is closed, and an open state in which the opening of the door frame 12 is open.

[0016] The door frame 12 has an opening. The opening is opened and closed in accordance with the movement of the door 11. A receiving portion 14 is attached to the indoor side of the door frame 12. The receiving portion 14 comes into contact with a contact portion 754 of the conversion portion 7, which will be described later.

[0017] The door 11 and the door frame 12 are provided with a locking device (not shown) that can be switched between a locked state that prevents the door 11 from being opened relative to the door frame 12, and an unlocked state that allows the door 11 to be opened relative to the door frame 12.

[0018] As shown in FIG. 4, the device body 10 includes a support unit 2, a control unit 4, a motor 5, a plurality of driven gears 6 (see FIG. 6), a conversion unit 7, a cutting unit 8, and a position sensor SE (see FIG. 6).

[0019] The support part 2 is formed of, for example, a metal material, and is fixed to the door 11. The support part 2 supports the control part 4, the motor 5, a plurality of driven gears 6, the conversion part 7, and the cutting part 8. As shown in FIG. 4, the support part 2 includes a first support member 21 and a second support member 22.

[0020] The first support member 21 is formed by bending a plate-like member, and includes a pair of mounting portions 21a that are attached to the door 11, and a central portion 21b that is located between the pair of mounting portions 21a in the width direction X.

[0021] The mounting portion 21a is provided with a plurality of through holes 21ah penetrating the mounting portion 21a in the vertical direction Z. The first support member 21 is fixed to the door 11 by bolts (not shown) whose tips are inserted into the through holes 21ah.

[0022] Further, the second support member 22 is attached to the first support member 21. In addition, the conversion unit 7 is attached to the first support member 21. A notch 21bh1 extending in an arc shape is formed in the central portion 21b of the first support member 21 in the circumferential direction of a second shaft core 741x (described later). A through hole 21bh2 penetrating the central portion 21b in the up-down direction Z is formed in the first support member 21.

[0023] In the first support member 21, a surface 21f of the central portion 21b is perpendicular to the up-down direction Z, and the surface 21f of the central portion 21b is perpendicular to an axis 52x of an output shaft 52 described later.

[0024] The control unit 4 and the cutting unit 8 are attached to the second support member 22. In addition, a motor 5 is attached to the second support member 22. More specifically, an output shaft 52 of the motor 5 is rotatably attached to the second support member 22. In addition, a plurality of driven gears 6 are rotatably attached to the second support member 22 (see FIG. 6). In addition, a through hole 22h penetrating the second support member 22 in the front-rear direction Y is formed in the second support member 22 (see FIG. 8).

[0025] The second support member 22 has a surface 22f perpendicular to the front-rear direction Y. The surface 22f of the second support member 22 and the surface of the door 11 are parallel to each other.

[0026] The control unit 4 shown in Fig. 4 is configured by a circuit (not shown) on a circuit board 41. The control unit 4 comprehensively controls each part of the device main body 10. The control unit 4 is electrically connected to a communication unit 42 and a position sensor SE (see Fig. 6). The position sensor SE will be described later.

[0027] The communication unit 42 is connected to a terminal (not shown) held by an operator via short-range wireless communication such as Bluetooth (registered trademark), and transmits and receives information, signals, etc. between the terminal and the door opening assistance device 1.

[0028] A terminal (not shown) performs a predetermined authentication process with the door opening assistance device 1 via the communication unit 42, thereby enabling transmission and reception of information, such as a door open command to open the door 11, to the door opening assistance device 1. The terminal then transmits a door open command to the locking device, and after the locking device is switched to an unlocked state based on the unlock command, transmits a predetermined door open command to the door opening assistance device 1 via the communication unit 42. On the other hand, when the door open command is transmitted, the control unit 4 drives the motor 5 to bring the door 11 into an initially open state.

[0029] The motor 5 shown in Fig. 4 is provided, for example, one in the door opening assistance device 1. The motor 5 includes a motor body 51 and an output shaft 52 provided with a drive gear 52G. The motor body 51 is electrically connected to a commercial power source 5E, and the output shaft 52 is rotated by the power of the commercial power source 5E. The motor 5 is, for example, a DC motor. The drive gear 52G is, for example, a worm gear. The axis 52x of the output shaft 52 of the motor 5 extends, for example, in the vertical direction Z.

[0030] The drive gear 52G is rotationally driven by the rotation of the output shaft 52. The drive gear 52G is a gear located on the input side. The drive gear 52G meshes with the first driven gear 6a.

[0031] As shown in Fig. 6, the multiple driven gears 6 include driven gears 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, and 6j. The first driven gear 6a is a helical gear (worm wheel) that meshes with the driving gear 52G, which is a worm gear. Each of the second driven gear 6b ​​to the tenth driven gear 6j is, for example, a spur gear. The tenth driven gear 6j is, for example, a pinion gear.

[0032] The first driven gear 6a and the second driven gear 6b ​​are rotatably fixed to the second support member 22. The axis 6ax of the first driven gear 6a and the axis 6bx of the second driven gear 6b ​​are coaxial, and the second driven gear 6b ​​rotates with the rotation of the first driven gear 6a. The first driven gear 6a meshes with the drive gear 52G. Therefore, when the first driven gear 6a rotates due to the rotation drive of the drive gear 52G, the second driven gear 6b ​​also rotates accordingly. The second driven gear 6b ​​meshes with the third driven gear 6c. The axis 6ax of the first driven gear 6a and the axis 6bx of the second driven gear 6b ​​extend, for example, in the front-rear direction Y.

[0033] The third driven gear 6c and the fourth driven gear 6d are rotatably fixed to the second support member 22. The axis 6cx of the third driven gear 6c and the axis 6dx of the fourth driven gear 6d are coaxial, and the fourth driven gear 6d rotates with the rotation of the third driven gear 6c. Therefore, when the third driven gear 6c rotates due to the rotation of the second driven gear 6b, the fourth driven gear 6d also rotates accordingly. The fourth driven gear 6d meshes with the fifth driven gear 6e. The axis 6cx of the third driven gear 6c and the axis 6dx of the fourth driven gear 6d extend, for example, in the front-rear direction Y.

[0034] The fifth driven gear 6e and the sixth driven gear 6f are rotatably fixed to the second support member 22. The axis 6ex of the fifth driven gear 6e and the axis 6fx of the sixth driven gear 6f are coaxial, and the sixth driven gear 6f rotates together with the rotation of the fifth driven gear 6e. Therefore, when the fifth driven gear 6e rotates due to the rotation of the fourth driven gear 6d, the sixth driven gear 6f also rotates accordingly. The sixth driven gear 6f meshes with the seventh driven gear 6g. The axis 6ax of the fifth driven gear 6e and the axis 6fx of the sixth driven gear 6f extend, for example, in the front-rear direction Y.

[0035] The seventh driven gear 6g and the eighth driven gear 6h are rotatably fixed to the second support member 22. The axis 6gx of the seventh driven gear 6g and the axis 6hx of the eighth driven gear 6h are coaxial, and the eighth driven gear 6h rotates together with the rotation of the seventh driven gear 6g. Therefore, when the seventh driven gear 6g rotates due to the rotation of the sixth driven gear 6f, the eighth driven gear 6h also rotates accordingly. The eighth driven gear 6h meshes with the ninth driven gear 6i. The axis 6gx of the seventh driven gear 6g and the axis 6hx of the eighth driven gear 6h extend, for example, in the front-rear direction Y.

[0036] The ninth driven gear 6i and the tenth driven gear 6j are rotatably fixed to the second support member 22. The axis 6ix of the ninth driven gear 6i and the axis 6jx of the tenth driven gear 6j are coaxial, and the tenth driven gear 6j rotates together with the rotation of the ninth driven gear 6i. Therefore, when the ninth driven gear 6i rotates due to the rotation of the eighth driven gear 6h, the tenth driven gear 6j also rotates accordingly. The tenth driven gear 6j is an output side driven gear that meshes with the rack gear 71. The axis 6ix of the ninth driven gear 6i and the axis 6jx of the tenth driven gear 6j extend, for example, in the front-rear direction Y.

[0037] The driven gears 6f, 6h, and 6j are small-diameter gears of the same shape and size. The driven gears 6e, 6g, and 6j are large-diameter gears of the same shape and size. That is, the diameters of the driven gears 6e, 6g, and 6j are larger than the diameters of the driven gears 6f, 6h, and 6j. In addition, the direction in which the axis 52x of the output shaft 52 of the motor 5 extends intersects with the direction in which the axis cores 6ax to 6jx of the multiple driven gears 6a to 6j extend. More specifically, in the door opening assistance device 1 according to this embodiment, the direction in which the axis core 52x of the output shaft 52 of the motor 5 extends intersects with the direction in which the axis cores 6ax to 6jx of the multiple driven gears 6a to 6j extend. 6 is perpendicular to the axes 6ax to 6jx of the driven gears 6a to 6j. In addition, the axes 6ax to 6jx of the driven gears 6a to 6j are perpendicular to the surface of the door 11.

[0038] The conversion unit 7 converts the driving force of the output driven gear 6j among the multiple driven gears 6 into a force for opening the door 11. The conversion unit 7 includes an integrally formed rack gear 71 and rack lever 72, a rotating member 73 (see FIG. 5), a swing lever 74, and a conversion lever 75. In other words, the conversion unit 7 includes the rack gear 71 located on the input side, and the conversion lever 75 located on the output side. In other words, the conversion unit 7 includes at least the rack gear 71 and the conversion lever 75. The conversion lever 75 is provided with a conversion lever biasing member 75s that biases the conversion lever 75 toward the first position.

[0039] The rack gear 71 meshes with the tenth driven gear 6j, which is a pinion gear. The rack gear 71 is formed at the lower end of the rack lever 72 in the up-down direction Z. That is, the rack gear 71 and the rack lever 72 are integrally formed. The rack gear 71 has a plurality of teeth arranged along the width direction X. Such a rack gear 71 moves in the width direction X (advances and retreats in a predetermined direction) by the driven rotation of the tenth driven gear 6j.

[0040] The rack lever 72 has a through hole 72h that penetrates the rack lever 72 in the front-rear direction Y. The through hole 72h extends in the width direction X. A plurality of pins 72p are inserted into the through holes 72h, and the rack lever 72 is attached to the second support member 22 so as to be movable in the width direction X. A detectable body SE2, which will be described later, is attached to such rack lever 72, and the detectable body SE2 moves in the width direction X together with the movement of the rack lever 72 in the width direction X.

[0041] 5, a rotating member 73, which is, for example, a bearing, is attached to the rack lever 72. The rotating member 73 is disposed at an end of the rack lever 72 in the width direction X. That is, the rotating member 73 is attached to the end of the rack lever 72 on which the rack gear 71 is provided, and is provided rotatable about a first shaft core 73x. The rotating member 73 is attached to the rack lever 72.

[0042] The rotating member 73 is, for example, a rolling bearing, and is formed in a cylindrical shape. The rotating member 73 has an inner ring 731 located on the inside in the radial direction of the first shaft core 73x, an outer ring 732 located on the outside, and a plurality of balls 733 located between the inner ring 731 and the outer ring 732 and arranged along the circumferential direction. The balls 733 are formed, for example, in a spherical shape. The outer ring 732 faces the inner ring 731 via the balls 733 in the radial direction of the first shaft core 73x, and can rotate in the circumferential direction of the first shaft core 73x relative to the inner ring 731. In addition, since the outer peripheral surface of the outer ring 732 is pressed by the conversion lever 75, the outer ring 732 rotates in the circumferential direction of the first shaft core 73x relative to the inner ring 731.

[0043] 6, the rocking lever 74 is formed in a plate shape extending in a radial direction relative to the second shaft core 741x. The rocking lever 74 is attached to the first support member 21 by the shaft portion 741 so as to be rockable in the circumferential direction of the second shaft core 741x. A notch 74h extending in an arc shape is formed in the rocking lever 74 in the circumferential direction relative to the second shaft core 741x. The second shaft core 741x of the shaft portion 741 and the shaft core 52x of the output shaft 52 are coaxial.

[0044] The conversion lever 75 is fixed to the swing lever 74 by a pin 75p. In the vertical direction Z, the first support member 21 and the swing lever 74 are disposed between a head 75p1 of the pin 75p and the conversion lever 75. A shaft portion 75p2 of the pin 75p is inserted into a notch 21bh1 of the first support member 21, and is inserted into a through-hole that passes through the swing lever 74 in the vertical direction Z, and is inserted into a bearing provided on the upper surface of the conversion lever 75 in the vertical direction Z.

[0045] Further, a recess 752 recessed downward in the vertical direction Z is provided on the upper surface of the conversion lever 75 in the vertical direction Z, and a connecting member 753 is disposed in the recess 752. The recess 752 is formed to extend in an arc shape in the circumferential direction of the second shaft core 741x. The connecting member 753 is formed, for example, in a cylindrical shape. Furthermore, the shaft portion 753p of the connecting member 753 is inserted into the notch 74h of the swing lever 74 and the through hole 21bh2 of the first support member 21.

[0046] Since the conversion lever 75 is attached to the first support member 21 with the swing lever 74 interposed therebetween as described above, when pressed by the rack lever 72 (rack gear 71) via the rotating member 73, the conversion lever 75 advances and retreats in the approximately front-rear direction Y relative to the first support member 21 while swinging together with the swing lever 74 in the circumferential direction of the second shaft core 741x. In other words, the conversion unit 7 converts the propulsive force in the width direction X (predetermined direction) of the rack gear 71 into a force in a direction (approximately the front-rear direction Y) intersecting the predetermined direction, and swings the conversion lever 75 in the approximately front-rear direction Y. Therefore, the notch 21bh1 and the pin 75p of the first support member 21 and the recess 752 and the shaft portion 753p of the conversion lever 75 have a function of guiding the movement of the conversion lever 75 advancing and retreating in the approximately front-rear direction Y relative to the first support member 21.

[0047] As shown in FIG. 5, the conversion lever 75 is formed in a substantially triangular shape when viewed from the vertical direction Z. That is, the conversion lever 75 is substantially triangular when viewed from above. The conversion lever 75 has a first surface 75f1 and a second surface 75f2 that are pressed against the outer ring 732 of the rotating member 73. The first surface 75f1 and the second surface 75f2 are formed in a substantially linear shape when viewed from the vertical direction Z. That is, the conversion lever 75 is formed in a substantially triangular shape when viewed from above, and the portion pressed by the rack gear 71 via the rotating member 73 includes two continuous straight lines 75L1 and 75L2. The straight lines 75L1 and 75L2 extend so as to be inclined with respect to the width direction X and the front-rear direction Y. More specifically, in the initial state, the first straight line 75L1 that contacts the rotating member 73 has a large intersecting angle with the front-to-back direction Y, while in the initial opening state, the second straight line 75L2 that contacts the rotating member 73 has a small intersecting angle with the front-to-back direction Y.

[0048] As described above, since the two continuous straight lines 75L1 and 75L2 are formed, when the motor 5 is driven in the initial position, the moving speed of the conversion lever 75 in the front-rear direction Y is fast, whereas when the rotating member 73 comes into contact with the second surface 75f2 including the second straight line 75L2, the moving speed of the conversion lever 75 in the front-rear direction Y is slowed down. Therefore, the door 11 opens vigorously at first, and then stops while opening slowly at the end, so that the door unlocking assist operation can be speeded up and down.

[0049] The conversion lever 75 having such a configuration is provided with a contact portion 754 as shown in Fig. 4. At a first position (initial position) where the door 11 is closed relative to the door frame 12, the contact portion 754 slightly protrudes from the end portion 21e on the rear Y1 side of the first support member 21. On the other hand, at a second position (initial opening position) where the door 11 is slightly opened relative to the door frame 12, the contact portion 754 protrudes from the end portion 21e on the rear Y1 side of the first support member 21 as shown in Fig. 7. In the door opening assistance device 1, the movement distance of the contact portion 754 in the front-rear direction Y is set to, for example, 25 mm. The contact portion 754 smoothly contacts the receiving portion 14.

[0050] The contact portion 754 is a portion that comes into contact with the receiving portion 14 provided on the door frame 12 when driven by the motor 5. The contact portion 754 shown in FIG. 5 is in a state where it has moved to the frontmost Y2 side in the front-rear direction Y and is disposed at a first position. On the other hand, the contact portion 754 shown in FIG. 7 is in a state where it has moved to the rearmost Y1 side in the front-rear direction Y and is disposed at a second position. And, the contact portion 754 comes into contact with the receiving portion 14 in the state shown in FIG. 7.

[0051] That is, in the door opening assistance device 1 according to this embodiment, when the motor 5 is driven, the contact portion 754 immediately presses the receiving portion 14. Then, in a state where the contact portion 754 has moved to the rearmost Y1 side, the contact portion 754 presses the receiving portion 14, and the door 11 moves to the front Y2 side, and the door 11 opens slightly. More specifically, at the end of the door 11 located on the opposite side of the hinge 11a in the width direction X, a small gap (for example, a gap of 10 mm to 20 mm) is formed between the door 11 and the door frame 12. Then, in a state where a small gap is formed between the door 11 and the door frame 12 (initial opening state), the pressure difference between the indoor side and the outdoor side is eliminated, and it is possible to move the door 11 in the opening direction with a small force compared to the closed state of the door 11.

[0052] 6 biases the swing lever 74 and the conversion lever 75, which are in a second position (initial opening position) where the door 11 is open relative to the door frame 12, toward a first position (initial position) where the door 11 is closed relative to the door frame 12. The conversion lever biasing member 75s is, for example, a torsion spring made of a metal material. The conversion lever biasing member 75s includes a biasing member main body 75s1, one end 75s2, and the other end 75s3.

[0053] The biasing member body 75s1 is formed by winding a metal material around the outer circumferential surface of the shaft portion 741 several times. One end 75s2 extends from the biasing member body 75s1 toward the outside in the radial direction of the second shaft core 741x of the shaft portion 741. The other end 75s3 extends from the biasing member body 75s1 toward the outside in the radial direction of the second shaft core 741x of the shaft portion 741 in a direction different from the one end 75s2. In addition, the one end 75s2 is hooked to a through hole 22h that penetrates the second support member 22 in the front-rear direction Y. The other end 75s3 is hooked to a pin 74p that is provided on the swing lever 74 and extends in the up-down direction Z.

[0054] In the door-opening assistance device 1 according to this embodiment, a path R (see FIG. 5) is formed for transmitting the driving force of the driving gear 52 to the conversion unit 7. The path R is constituted by, for example, a plurality of driven gears 6a to 6j.

[0055] Next, the initial positions of the door 11 and the door opening assistance device 1 will be described. The initial position of the door 11 is a state in which the opening of the door frame 12 is closed by the door 11. The initial position of the door opening assistance device 1 is a position in which the contact portion 754 is located at the most forward Y2 side in the front-rear direction Y and the rack gear 71 is located at the most left side in the width direction X in Fig. 6. The initial position of the locking device corresponds to the locked state.

[0056] Next, the operation of the door opening assistance device 1 having the above configuration will be described. When an unlock command is sent from a terminal (not shown) with each unit placed in the initial position, the lock device switches from a locked state to an unlocked state. After that, the terminal sends a door open command to the control unit 4.

[0057] When a door open command is transmitted, the control unit 4 shown in Fig. 4 drives the motor 5 using power from a commercial power source 5E. When the motor 5 is driven, the motor body 51 rotates the output shaft 52. Then, the drive gear 52G fixed to the output shaft 52 rotates about the output shaft 52. For example, as shown in Fig. 5, when viewed from below in the vertical direction Z, the drive gear 52G rotates counterclockwise as indicated by the arrow FG.

[0058] The first driven gear 6a meshing with the drive gear 52G rotates about an axis 6ax as the drive gear 52G rotates. For example, as shown in Fig. 6, when viewed from the rear Y1 in the front-rear direction Y, the first driven gear 6a rotates in the clockwise direction indicated by the arrow Fa.

[0059] The second driven gear 6b, which is fixed coaxially with the first driven gear 6a, rotates together with the first driven gear 6a. For example, when viewed from the rear Y1 in the front-rear direction Y, the second driven gear 6b ​​rotates clockwise as indicated by the arrow Fb.

[0060] The third driven gear 6c meshing with the second driven gear 6b ​​rotates about the axis 6cx by the rotation of the second driven gear 6b. For example, when viewed from the rear Y1 in the front-rear direction Y, the third driven gear 6c rotates counterclockwise as indicated by the arrow Fc.

[0061] The fourth driven gear 6d, which is fixed coaxially with the third driven gear 6c, rotates about the axis 6cx together with the third driven gear 6c. For example, when viewed from the rear Y1 in the front-rear direction Y, the fourth driven gear 6d rotates counterclockwise as indicated by the arrow Fd.

[0062] The fifth driven gear 6e meshing with the fourth driven gear 6d rotates about a shaft core 6ex by the rotation of the fourth driven gear 6d. For example, when viewed from the rear Y1 in the front-rear direction Y, the fifth driven gear 6e rotates clockwise as indicated by the arrow Fe.

[0063] The sixth driven gear 6f, which is fixed coaxially with the fifth driven gear 6e, rotates together with the fifth driven gear 6e. For example, when viewed from the rear Y1 in the front-rear direction Y, the sixth driven gear 6f rotates clockwise as indicated by the arrow Ff.

[0064] The seventh driven gear 6g meshing with the sixth driven gear 6f rotates about a central axis 6gx by the rotation of the sixth driven gear 6f. For example, when viewed from the rear Y1 in the front-rear direction Y, the seventh driven gear 6g rotates counterclockwise as indicated by the arrow Fg.

[0065] The eighth driven gear 6h, which is fixed coaxially with the seventh driven gear 6g, rotates together with the seventh driven gear 6g. For example, when viewed from the rear Y1 in the front-rear direction Y, the eighth driven gear 6h rotates counterclockwise as indicated by the arrow Fh.

[0066] The ninth driven gear 6i meshing with the eighth driven gear 6h rotates about a shaft core 6hx by the rotation of the eighth driven gear 6h. For example, when viewed from the rear Y1 in the front-rear direction Y, the ninth driven gear 6i rotates clockwise as indicated by the arrow Fi.

[0067] A tenth driven gear 6j fixed coaxially with the ninth driven gear 6i rotates together with the ninth driven gear 6i. For example, when viewed from the rear Y1 in the front-rear direction Y, the tenth driven gear 6j rotates clockwise as indicated by an arrow Fj.

[0068] The rack gear 71 meshing with the tenth driven gear 6j moves in the width direction X as the tenth driven gear 6j rotates. More specifically, in FIG. 6, the rack gear 71 located on the left side in the width direction X moves to the right side in the width direction X as the tenth driven gear 6j rotates.

[0069] As the rack gear 71 moves in the width direction X, the rotating member 73 moves to the right in the width direction X, and the outer ring 732 of the rotating member 73 presses the first surface 75f1 of the conversion lever 75. As a result, the conversion unit 7 converts the propulsive force of the rack gear 71 in the width direction X into a force directed toward the rear Y1 in the front-rear direction Y substantially perpendicular to the width direction X. More specifically, the propulsive force of the rack gear 71 in the width direction X causes the swing lever 74 and the conversion lever 75 to swing around the second axis 741x of the shaft portion 741 (more specifically, clockwise in FIG. 6), and the conversion lever 75 moves toward the rear Y1 side in the front-rear direction Y.

[0070] As the conversion lever 75 moves, the contact portion 754 moves from the front Y2 side to the rear Y1 side in the front-rear direction Y. Thereafter, the contact portion 754 comes into contact with the receiving portion 14, whereby the contact portion 754 shown in FIG.

[0071] Then, after a predetermined time has elapsed, the control unit 4 reversely drives the motor 5 using the power of the commercial power source 5E. The reverse driving of the motor 5 rotates the drive gear 52G in the opposite direction to the previous direction, thereby rotating the driven gears 6a to 6j in the opposite directions. As a result, the conversion unit 7 moves the contact portion 754 from the rear Y1 side to the front Y2 side in the front-rear direction Y, and the door 11 closes against the door frame 12 due to the biasing force of a biasing component (not shown).

[0072] Next, the cutting unit 8 of the door opening assistance device 1 will be described. During the operation of the door opening assistance device 1, the operator may wish to return the door 11 to a closed state when the door 11 is slightly open relative to the door frame 12. For example, when a power outage occurs while the motor 5 is being driven and the door 11 is slightly open, the operator may wish to return the door 11 to a closed state. In such a state, the operator can operate the cutting unit 8 to stop the operation of slightly opening the door 11 relative to the door frame 12, and then return the door 11 to a closed state.

[0073] The cutter 8 shown in FIG. 5 and FIG. 8 cuts the path R that transmits the driving force of the motor 5 to the contact portion 754 by manual operation of the operator, for example, during operation of the conversion unit 7. The cutter 8 according to this embodiment cuts off the driving force between the drive gear 52G and the third driven gear 6c. More specifically, for example, during operation of the conversion unit 7, the cutter 8 releases the meshing between the drive gear 52G and the first driven gear 6a, and releases the meshing between the second driven gear 6b ​​and the third driven gear 6c. Then, in a state in which the meshing between the drive gear 52G and the first driven gear 6a is released, and the meshing between the second driven gear 6b ​​and the third driven gear 6c is released, when the motor 5 is driven, the driven gears 6c to 6j do not rotate, and the swing lever 74 and the conversion lever 75 do not swing, so that the door 11 cannot move in the opening direction. Then, the door 11 is urged from the open state to the closed state by the urging force of a urging part (not shown), and the door 11 returns to the closed state.

[0074] The cutting unit 8 shown in Fig. 5 has an operation button 81 (see Fig. 1) and a gear moving mechanism 82. The operation button 81 is exposed to the outside on the indoor side from a through hole 111h2 formed in the indoor side exterior member 111.

[0075] The gear moving mechanism 82 includes a columnar portion 82a, a third shaft portion 82b, a cylindrical portion 82c, and a cutting portion biasing member 82d.

[0076] The pillar portion 82a is fixed to the second support member 22, extends in the front-rear direction Y, and is formed in a cylindrical shape. The third shaft portion 82b is provided in a cylindrical shape so as to be movable in the front-rear direction Y relative to the pillar portion 82a, and the first driven gear 6a and the second driven gear 6b ​​are fixed thereto. The cylindrical portion 82c is formed in a cylindrical shape having an inner circumferential surface facing the outer circumferential surface of the pillar portion 82a. The operation button 81 is disposed on the rear Y1 side in the front-rear direction Y of the third shaft portion 82b.

[0077] Further, a space for accommodating a part of the cutting portion biasing member 82d is formed by the outer peripheral surface of the columnar portion 82a and the inner peripheral surface of the tubular portion 82c. The cutting portion biasing member 82d is, for example, a coil spring made of a metal material, and is disposed in the front-rear direction Y between a flange portion formed on the radially outer side of the columnar portion 82a and the third shaft portion 82b.

[0078] In the cutting portion 8, when no external force is applied to the operation button 81, the elastic force of the cutting portion biasing member 82d biases the third shaft portion 82b, the first driven gear 6a, and the second driven gear 6b ​​toward the rear (Y1) side in the front-to-rear direction Y, so that the drive gear 52G and the first driven gear 6a mesh with each other, and the second driven gear 6b ​​and the third driven gear 6c mesh with each other.

[0079] Thereafter, when the operation button 81 is pressed by manual operation of the operator while the conversion unit 7 is in operation after the motor 5 is driven, the first driven gear 6a and the second driven gear 6b ​​move forward Y2 relative to the second support member 22 in the front-rear direction Y as shown in Fig. 8. This releases the engagement between the drive gear 52G and the first driven gear 6a, and releases the engagement between the second driven gear 6b ​​and the third driven gear 6c. In addition, when the operation button 81 is pressed by the operator, the cutting portion biasing member 82d is compressed in the front-rear direction Y.

[0080] Then, the door 11 is biased from the open state to the closed state by the biasing force of a biasing part (not shown), and after the door 11 returns to the closed state, when the manual operation by the operator is released, the first driven gear 6a and the second driven gear 6b ​​move backward Y1 side in the front-rear direction Y with respect to the second support member 22 by the elastic restoring force of the cutting portion biasing member 82d. Even if the drive gear 52G and the first driven gear 6a are not meshed with each other, when the motor 5 is driven, the drive gear 52G rotates about the axis 52x, so that the meshing between the drive gear 52G and the first driven gear 6a is restored, and the meshing between the second driven gear 6b ​​and the third driven gear 6c is restored, and normal operation becomes possible.

[0081] 6 is, for example, a photointerrupter. The position sensor SE includes a sensor body SE1 and a detection object SE2 that is detected by the sensor body SE1.

[0082] The sensor body SE1 has a pair of sensor units. One of the pair of sensor units is, for example, a light-emitting unit that emits light, and the other of the pair of sensor units is, for example, a light-receiving unit that receives the light emitted from the light-emitting unit. Such a sensor body SE1 is attached to, for example, the second support member 22.

[0083] The detectable object SE2 is formed of a material that blocks light emitted from the light emitting portion when it is disposed between a pair of sensor portions in the sensor main body SE1. The detectable object SE2 is attached to the rack gear 71 and moves in the width direction X together with the movement of the rack gear 71. In other words, the rack gear 71 includes the detectable object SE2 that moves together with the advancement and retreat of the rack gear 71 in the width direction (predetermined direction) X.

[0084] When one end portion SE21 of the detection object SE2 in the width direction X is disposed between the pair of sensor portions, the light receiving portion and the light emitting portion are not completely blocked, so that the light receiving portion can detect the light from the light emitting portion. That is, the position sensor SE can detect the light at the first position (initial position) of the rack gear 71 when the door 11 is closed relative to the door frame 12.

[0085] In addition, even when the end portion SE22 on the other side in the width direction X of the detection object SE2 is disposed between the pair of sensor portions, the light receiving portion and the light emitting portion are not completely blocked, so that the light receiving portion can detect the light from the light emitting portion. That is, the position sensor SE can detect light at the second position (initial opening position) of the rack gear 71 when the door 11 is slightly open relative to the door frame 12.

[0086] On the other hand, when the center portion of the detection object SE2 between one end portion SE21 and the other end portion SE22 is disposed in a pair of sensor portions, the light receiving portion cannot detect the light from the light emitting portion because the light receiving portion and the light emitting portion are completely blocked. That is, the position sensor SE cannot detect light when it is not in the first position (initial position) or the second position (initial opening position).

[0087] The position sensor SE can detect the first position (initial position) and the second position (initial release position) based on, for example, the timing at which the motor 5 is driven and whether or not light is detected. The detection result of the position sensor SE is then transmitted to the control unit 4.

[0088] In the door-opening assistance device 1 according to this embodiment, when the door 11 moves to the initial open position where a small gap is formed between the door 11 and the door frame 12 by pressing the receiving portion 14 against the contact portion 754, the contact portion 754 is positioned at the rearmost side (Y1) in the front-rear direction Y, as shown in Fig. 7. In this state, the rack lever 72 and the detectable object SE2 are positioned at the rightmost position (second position) in Fig. 8, and the position sensor SE detects the detectable object SE2 in this position.

[0089] On the other hand, when the motor 5 in the door opening assistance device 1 is in a non-driving state, the rack lever 72 and the detection object SE2 are positioned at the leftmost position (first position) in FIG. 6, and the position sensor SE detects the detection object SE2 in this position.

[0090] In the above-described door opening assistance device 1, the direction in which the axis 52x of the output shaft 52 of the motor 5 extends is perpendicular to the direction in which the axis cores 6ax-6jx of the driven gears 6a-6j extend when viewed from the width direction X. However, the door opening assistance device 1 according to the present embodiment is not limited thereto. For example, in the door opening assistance device 1, the direction in which the axis 52x of the output shaft 52 of the motor 5 extends may intersect with the direction in which the axis cores 6ax-6jx of the driven gears 6a-6j extend when viewed from the width direction X.

[0091] The door opening assistance device 1 described above includes at least the motor 5, the multiple driven gears 6, and the receiving part 14 provided so as to be able to come into contact with the contact part 754 moving forward and backward from the device main body 10 having the conversion part 7, the device main body 10 being attached to the door 11, and the receiving part 14 being attached to the door frame 12. However, the door opening assistance device 1 according to this embodiment is not limited thereto. For example, the device main body 10 may be attached to the door frame 12. In this case, the surface of the door 11 may be used as the receiving part that comes into contact with the contact part 754, or the receiving part that comes into contact with the contact part 754 may be attached to the door 11.

[0092] As described above, the door opening assistance device 1 according to the present embodiment includes the motor 5 having the drive gear 52G provided on the output shaft 52, the multiple driven gears 6a to 6j that transmit the drive force of the drive gear 52G, and the conversion unit 7 that converts the drive force of the output side driven gear 6j among the multiple driven gears 6a to 6j into a force to open the door 11. The conversion unit 7 has at least a rack gear 71. The rack gear 71 advances and retreats in the width direction (predetermined direction) X by the rotation of the multiple driven gears 6. When viewed from the up-down direction Z, the conversion unit 7 converts the propulsive force of the rack gear 71 in the width direction (predetermined direction) X into a force in a direction intersecting the width direction (predetermined direction) X. The direction in which the axis 52x of the output shaft 52 of the motor 5 extends intersects with the direction in which the axis centers 6ax to 6jx of the multiple driven gears 6a to 6j extend. Therefore, the size of the door opening assistance device 1 according to this embodiment in the front-rear direction Y can be reduced.

[0093] In the door opening assist device 1 according to this embodiment, the axis 52x of the output shaft 52 of the motor 5 extends in the vertical direction Z, and the axes 6ax-6jx of the driven gears 6a-6j extend perpendicular to the surface of the door 11. This allows the length of the door opening assist device 1 in the front-rear direction Y to be shortened. The length of the door opening assist device 1 in the front-rear direction Y is approximately 35 mm.

[0094] The door opening assistance device 1 according to this embodiment has the following configuration. The door opening assistance device 1 includes a cutting unit 8 that cuts the path R that transmits the driving force of the drive gear 52G to the conversion unit 7 by manual operation of an operator. Therefore, the door opening assistance device 1 according to this embodiment can prevent the door 11 from being opened by the operation of the cutting unit 8 by the operator based on the operator's wish.

[0095] The door opening assistance device 1 according to this embodiment has the following configuration. In the door opening assistance device 1, the conversion unit 7 further has a conversion lever 75, and the conversion lever 75 is provided with a conversion lever biasing member (biasing member) 75s that biases the conversion lever 75 from a second position where the door 11 is open relative to the door frame 12 toward a first position where the door 11 is closed relative to the door frame 12. Therefore, in a state where the path R that transmits the driving force of the drive gear 52G to the conversion unit 7 is cut by the cutting unit 8, the conversion lever 75 moves from the second position toward the first position due to the biasing force of the conversion lever biasing member 75s, and the door 11 moves to the closed position due to the biasing force of a biasing component (not shown).

[0096] The door opening assistance device 1 according to this embodiment has the following configuration. The rack gear 71 has a detectable object SE2 that moves with the advancement and retreat of the rack gear 71 in the width direction (predetermined direction) X. The rack gear 71 moves to a first position in a state in which the door 11 is closed relative to the door frame 12, and a second position in a state in which the door 11 is slightly open relative to the door frame 12. The door opening assistance device 1 further has a position sensor (sensor) SE that detects the first and second positions of the rack gear 71 by the detectable object SE2. Therefore, the door opening assistance device 1 according to this embodiment can detect, by the position sensor (sensor) SE, whether the door 11 is in a closed position or in an initial opening position in which the door 11 is slightly open.

[0097] Furthermore, since the door opening assistance device 1 of this embodiment can detect the first position and the second position with one position sensor (sensor) SE, the number of position sensors can be reduced and the door opening assistance device 1 can be manufactured more inexpensively than a device that detects the position of the rack gear 71 with two position sensors.

[0098] The door opening assistance device 1 according to this embodiment has the following configuration. The conversion unit 7 further has a conversion lever 75 that swings approximately in the front-rear direction (a direction intersecting with the predetermined direction) Y. The conversion lever 75 is formed in a substantially triangular shape when viewed from above, and the portion that is directly or indirectly pressed by the rack gear 71 includes at least two continuous straight lines 75L1, 75L2.

[0099] The door opening assistance device 1 according to this embodiment further includes at least a motor 5, a plurality of driven gears 6, and a receiving portion 14 provided so as to be able to come into contact with a contact portion 754 that advances and retreats from a device body 10 having a conversion portion 7. The receiving portion 14 is attached to a door frame 12, and the device body 10 is attached to a door 11. The conversion portion 7 further includes a conversion lever 75, and a contact portion 754 provided on the conversion lever 75 smoothly comes into contact with the receiving portion 14.

[0100] The door opening assistance device 1 according to this embodiment includes at least a device body 10 having a motor 5, a plurality of driven gears 6, and a conversion unit 7, and a receiving unit 14 provided so as to be able to come into contact with a contact unit 754 moving forward and backward from the device body 10. The device body 10 is attached to an upper edge 11u of the door 11, and the receiving unit 14 is attached to the door frame 12.

[0101] In the door opening assistance device 1 of this embodiment, the conversion unit 7 includes a rack gear 71, a rotating member 73 attached to the end of the rack gear 71 and rotatably arranged around the first axis 73x, a swing lever 74 arranged to be swingable around the second axis 741x, and a conversion lever 75 pressed by the rotating member 73 and arranged to be swingable together with the swing lever 74 around the second axis 741x.

[0102] The door opening assistance device 1 according to this embodiment has the following configuration. Two driven gears 6, a first driven gear 6a and a second driven gear 6b, are arranged coaxially. Two driven gears 6, a third driven gear 6c and a fourth driven gear 6d, are arranged coaxially. Two driven gears 6, a fifth driven gear 6e and a sixth driven gear 6f, are arranged coaxially. Two driven gears 6, a seventh driven gear 6g and an eighth driven gear 6h, are arranged coaxially. Two driven gears 6, a ninth driven gear 6i and a tenth driven gear 6j, are arranged coaxially. When viewed from the front-rear direction Y, the shaft core 6ax of the first driven gear 6a, the shaft core 6bx of the second driven gear 6b, the shaft core 6cx of the third driven gear 6c, the shaft core 6dx of the fourth driven gear 6d, the shaft core 6ex of the fifth driven gear 6e, the shaft core 6fx of the sixth driven gear 6f, the shaft core 6gx of the seventh driven gear 6g, the shaft core 6hx of the eighth driven gear 6h, the shaft core 6ix of the ninth driven gear 6i, and the shaft core 6jx of the tenth driven gear 6j are arranged at different positions. Therefore, the door opening assistance device 1 can be made small while appropriately adjusting the reduction ratio of the multiple driven gears 6.

[0103] The door opening assistance device 1 according to the first embodiment described above is described as having ten driven gears 6a to 6j. However, the number of the multiple driven gears 6 is not limited to this, and can be set to any number.

[0104] Also, in the door opening assistance device 1 according to the embodiment described above, the conversion unit 7 has the rack gear 71, the rotating member 73, and the conversion lever 75, and the rack gear 71 presses the conversion lever 75 via the rotating member 73. That is, in the door opening assistance device 1 according to the embodiment, the rack gear 71 indirectly presses the conversion lever 75. However, the door opening assistance device 1 according to the embodiment is not limited to this. For example, in the door opening assistance device 1, the conversion unit 7 may not be provided with the rotating member 73, and the rack gear 71 may directly press the conversion lever 75.

[0105] Furthermore, in the door opening assistance device 1 according to the first embodiment described above, the conversion lever 75 is formed in a substantially triangular shape when viewed from above, and the portion pressed by the rack gear 71 via the rotating member 73 includes two continuous straight lines 75L1 and 75L2. However, the door opening assistance device 1 according to the present embodiment is not limited to this. For example, in the conversion lever 75, the portion pressed by the rack gear 71 via the rotating member 73 may be formed by two continuous curved lines.

[0106] Also, in the door opening assistance device 1 according to the embodiment described above, the conversion lever 75 has the contact portion 754, and the conversion lever 75 and the contact portion 754 are integrated. However, the door opening assistance device 1 of this embodiment is not limited to this. For example, in the door opening assistance device 1, the conversion lever 75 and the contact portion 754 may be formed separately, and a bearing similar to that of the rotating member 73 may be used for the contact portion 754, and the contact portion constituted by the bearing may come into contact with the receiving portion 14. Of course, the contact portion 754 may be a part other than a bearing.

[0107] Furthermore, the door opening assistance device 1 according to the above embodiment has been described as having the rack gear 71 and the detection object SE2 formed separately. However, the door opening assistance device 1 according to the present embodiment is not limited to this, and the rack gear 71 and the detection object SE2 may be formed integrally.

[0108] In addition, in the door opening assistance device 1 according to the embodiment described above, the conversion lever 75 has two continuous straight lines 75L1 and 75L2. However, the door opening assistance device 1 according to the present embodiment is not limited thereto, and the conversion lever 75 may have three or more straight lines.

[0109] Second embodiment Next, the door opening assistance device 1A according to the second embodiment will be described. FIG. 9 is a bottom view showing the initial state of the door opening assistance device 1A according to the second embodiment. FIG. 10 is a bottom view showing the initial open state of the door opening assistance device 1A shown in FIG. 9. FIG. 11 is a bottom view showing the elastic restoring forces generated in the two conversion lever biasing members 75sA and 75sB in the initial open state shown in FIG. 9. Note that, for convenience of explanation, the operation button 81 is omitted in FIG. 9 and FIG. 10. Also, for convenience of explanation, some of the components of the door opening assistance device 1A are omitted in FIG. 11.

[0110] In addition, in the configuration of the door opening assistance device 1A in the second embodiment, the same configurations as those in the door opening assistance device 1 in the first embodiment are given the same symbols and their explanations are omitted, and only the different configurations are explained below.

[0111] Furthermore, the conversion unit 7 of the door opening assistance device 1 according to the first embodiment includes one conversion lever biasing member 75s, but the conversion unit 7A of the door opening assistance device 1A according to the present embodiment includes a first conversion lever biasing member 75sA and a second conversion lever biasing member 75sB, as shown in Figures 9 to 11. That is, the conversion unit 7A of the door opening assistance device 1A according to the present embodiment includes two conversion lever biasing members 75sA and 75sB.

[0112] The two conversion lever biasing members 75sA, 75sB bias the swing lever 74 and the conversion lever 75, which are in a second position (initial opening position) where the door 11 is open relative to the door frame 12, toward a first position (initial position) where the door 11 is closed relative to the door frame 12. Each of the two conversion lever biasing members 75sA, 75sB is, for example, a torsion spring made of a metal material.

[0113] The first shift lever biasing member 75sA includes a first biasing member body 75sA1, a first end portion 75sA2, and a second end portion 75sA3. The first biasing member body 75sA1 corresponds to the biasing member body 75s1 of the shift lever biasing member 75s, the first end portion 75sA2 corresponds to one end portion 75s2 of the shift lever biasing member 75s, and the second end portion 75sA3 corresponds to the other end portion 75s3 of the shift lever biasing member 75s.

[0114] The first biasing member body 75sA1 is formed by winding a metal material multiple times around the outer circumferential surface of the shaft portion 741. The first end portion 75sA2 is hooked onto a through hole 22h that penetrates the second support member 22 in the front-rear direction Y. The second end portion 75sA3 is hooked onto a pin 74p that is provided on the swing lever 74 and extends in the up-down direction Z.

[0115] The second conversion lever biasing member 75sB includes a second biasing member body 75sB1, a first end 75sB2, and a second end 75sB3. The second biasing member body 75sB1 corresponds to the biasing member body 75s1 of the conversion lever biasing member 75s, the first end 75sB2 corresponds to one end 75s2 of the conversion lever biasing member 75s, and the second end 75sB3 corresponds to the other end 75s3 of the conversion lever biasing member 75s.

[0116] The second biasing member body 75sB1 is formed by winding a metal material multiple times around the outer circumferential surface of a pin 21bp that protrudes downward in the up-down direction Z from the lower surface of the central portion 21b of the first support member 21. The first end 75sB2 is hooked onto a notch 221h formed in the second support member 22. The second end 75sB3 is hooked onto a pin 74p provided on the swing lever 74 and extending in the up-down direction Z (see FIG. 10).

[0117] In the conversion unit 7A according to this embodiment, when viewed from the up-down direction Z, the first conversion lever biasing member 75sA and the second conversion lever biasing member 75sB are disposed at different positions. For example, the first biasing member body 75sA1 of the first conversion lever biasing member 75sA is disposed at one end of the central portion 21b of the first support member 21 in the width direction X. On the other hand, the second biasing member body 75sB1 of the second conversion lever biasing member 75sB is disposed at the other end of the central portion 21b of the first support member 21 in the width direction X. The first conversion lever biasing member 75sA and the second conversion lever biasing member 75sB are disposed, for example, substantially line-symmetrically in the width direction X.

[0118] In the above-mentioned initial release state, an elastic restoring force F1 is generated in the first conversion lever biasing member 75sA, and an elastic restoring force F2 is generated in the second conversion lever biasing member 75sB. The resultant force F3 of the elastic restoring force F1 of the first conversion lever biasing member 75sA and the elastic restoring force F2 of the second conversion lever biasing member 75sB is greater than the elastic restoring force F1 and is greater than the elastic restoring force F2.

[0119] The door opening assistance device 1A according to this embodiment has the following configuration. The conversion unit 7 further has a conversion lever 75, and the conversion lever 75 is provided with two conversion lever biasing members (biasing members) 75sA and 75sB that bias the door 11 from a second position where the door 11 is open relative to the door frame 12 toward a first position where the door 11 is closed relative to the door frame 12. The two conversion lever biasing members (biasing members) 75sA and 75sB are disposed at different positions. Therefore, the resultant force F3 of the elastic restoring force F1 of the first conversion lever biasing member 75sA and the elastic restoring force F2 of the second conversion lever biasing member 75sB is larger than the elastic restoring force F1 and is also larger than the elastic restoring force F2. As a result, the first conversion lever biasing member 75sA and the second conversion lever biasing member 75sB can be made smaller in size. In addition, when one conversion lever biasing member (biasing member) 75s is provided on the conversion lever 75, the elastic restoring force of the conversion lever biasing member (biasing member) 75s acts on the swing lever 74 and the conversion lever 75 to one side in the width direction X, which may cause rattling. On the other hand, the conversion unit 7A of the door opening assistance device 1A according to this embodiment is provided with two conversion lever biasing members (biasing members) 75sA and 75sB, and the two conversion lever biasing members (biasing members) 75sA and 75sB are disposed at different positions. Therefore, in the width direction X, the elastic restoring force of the first conversion lever biasing member (biasing member) 75sA and the elastic restoring force of the second conversion lever biasing member (biasing member) 75sB act on the swing lever 74 and the conversion lever 75 in a balanced manner, thereby preventing rattling from occurring.

[0120] The door opening assistance device 1A according to this embodiment has the following configuration. The door opening assistance device 1A includes at least a device main body 10A having a motor 5, a plurality of driven gears 6, and a conversion unit 7, and a receiving unit 14 provided so as to be able to come into contact with a contact unit 754 moving forward and backward from the device main body 10A. The device main body 10A is attached to the door 11. The receiving unit 14 is attached to the door frame 12. When the door 11 is closed, the device main body 10A is disposed in an internal space 11s formed by an indoor exterior member (first exterior member) 111 disposed on the indoor side and an outdoor exterior member (second exterior member) 112 disposed on the outdoor side. Therefore, it is possible to prevent the device main body 10A from being exposed to the outside of the door 11.

[0121] Third embodiment Next, a door opening assistance device 1B according to a third embodiment will be described. Fig. 12 is a perspective view showing the door opening assistance device 1B according to the third embodiment. Fig. 13 is a perspective view showing the device body 10B of the door opening assistance device 1B shown in Fig. 12.

[0122] In addition, in the configuration of the door opening assistance device 1B in the third embodiment, the same configurations as those of the door opening assistance device 1 in the first embodiment are given the same symbols and their explanations are omitted, and the different configurations are explained below.

[0123] The device body 10B of the door opening assistance device 1B according to this embodiment is attached to, for example, the door 11. More specifically, the device body 10B is attached (hung) to the upper edge 11u of the door 11 via, for example, the third support member 23 of the support part 2B shown in Fig. 12. In other words, the device body 10B according to this embodiment is disposed outside the door 11, on the indoor side.

[0124] The device main body 10B according to this embodiment includes a cover portion 3 that covers a support portion 2B, a control portion 4, a motor 5, a plurality of driven gears 6, a conversion portion 7, a cutting portion 8, and a position sensor SE.

[0125] The door opening assistance devices 1 and 1A according to the above-described embodiments are disposed inside the door 11. On the other hand, the door opening assistance device 1B according to the present embodiment has the device body 10 and the receiving portion 14 disposed on the indoor side of the door 11 in the front-rear direction Y.

[0126] Moreover, the door-opening assistance devices 1, 1A are disposed in the internal space 11s of the door 11, and the door-opening assistance device 1B is disposed outside the door 11. When changing the placement location, the support parts 2, 2B that attach the device main bodies 10, 10B to the door 11 are changed.

[0127] 12 is formed of, for example, a resin material, and covers the device body 10 except for the contact portion 754 of the conversion portion 7 and the operation button 81 of the cutting portion 8. The cover portion 3 has a first opening 31 that exposes the operation button 81 of the cutting portion 8, and a second opening 32 that exposes the contact portion 754.

[0128] The door opening assistance device 1B according to this embodiment has the following configuration. The door opening assistance device 1B includes a cover part 3 that covers the device main body 10B. The cover part 3 has openings 31, 32 that expose the operation button 81 and the contact part 754 of the cutting part 8. Therefore, the door opening assistance device 1 can prevent foreign objects from entering the inside of the cover part 3.

[0129] In addition, the door opening assistance device 1B according to this embodiment can be applied to a conversion unit 7 having one conversion lever biasing member (biasing member) 75s, or a conversion unit 7A having two conversion lever biasing members (biasing members) 75sA and 75sB. The above-mentioned cover unit 3 can also be applied to the door opening assistance devices 1 and 1A.

[0130] Furthermore, the present invention is not limited to the above-mentioned embodiments. The present invention also includes configurations in which the components of the above-mentioned embodiments are appropriately combined. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-mentioned embodiments, and various modifications are possible. [Explanation of symbols]

[0131] 1, 1A, 1B Door opening assistance device, 2, 2B Support part, 3 Cover part, 31 First opening, 32 Second opening, 5 Motor, 52 Output shaft, 52x Shaft core, 52G Drive gear, 6 Multiple driven gears, 6a First driven gear (driven gear), 6ax Shaft core, 6b Second driven gear (driven gear), 6bx Shaft core, 6c Third driven gear (driven gear), 6cx Shaft core, 6d Fourth driven gear (driven gear), 6dx Shaft core, 6e Fifth driven gear (driven gear), 6ex Shaft core, 6f Sixth driven gear (driven gear), 6fx Shaft core, 6g Seventh driven gear (driven gear), 6gx Shaft core, 6h Eighth driven gear (driven gear), 6hx Axle core, 6i 9th driven gear (driven gear), 6ix Axle core, 6j 10th driven gear (driven gear), 6jx Axle core, 7, 7A Conversion part, 71 Rack gear, 73 Rotating member, 73x 1st shaft core, 74 Swing lever, 741x 2nd shaft core, 75 Conversion lever, 75L1 1st straight line (straight line), 75L2 2nd straight line (straight line), 75s Conversion lever biasing member (biasing member), 75sA Conversion lever biasing member (biasing member), 75sB Conversion lever biasing member (biasing member), 754 Contact part, 8 Cutting part, 81 Operation button, 10, 10A, 10B Device body, 11 Door, 111 Indoor exterior member (first exterior member), 112 Outdoor exterior member (second exterior member), 12 Door frame, 14 Receiving part, R path, SE sensor (position sensor), SE2 detection object, X width direction

Claims

1. A motor having a drive gear provided on an output shaft; a plurality of driven gears for transmitting the driving force of the drive gear; A conversion unit that converts a driving force of the output side driven gear among the plurality of driven gears into a force for opening the door; Equipped with The conversion unit has at least a rack gear, The rack gear advances and retreats in a predetermined direction by the rotation of the plurality of driven gears, The conversion unit converts a thrust force of the rack gear in a predetermined direction into a force in a direction intersecting the predetermined direction, a direction in which an axis of the output shaft of the motor extends intersects with a direction in which axes of the driven gears extend; Door opening assistance device.

2. a cutting unit that cuts a path for transmitting the driving force of the driving gear to the conversion unit by manual operation by an operator; The door opening assistance device according to claim 1.

3. The conversion unit further has a conversion lever, and the conversion lever is provided with a biasing member that biases the conversion lever from a second position in which the door is open relative to the door frame toward a first position in which the door is closed relative to the door frame. The door opening assistance device according to claim 2.

4. The conversion unit further has a conversion lever, and the conversion lever is provided with two biasing members that bias the door from a second position in which the door is open relative to the door frame toward a first position in which the door is closed relative to the door frame, The two biasing members are disposed at different positions. The door opening assistance device according to claim 2.

5. the rack gear includes a detection object that moves with the advancement and retreat of the rack gear in a predetermined direction, The rack gear moves to a first position in a state where the door is closed relative to the door frame, and a second position in a state where the door is slightly open relative to the door frame, a sensor that detects the first position and the second position of the rack gear by the detection object, The door opening assistance device according to claim 3 or 4.

6. The conversion unit further includes a conversion lever that swings in a direction intersecting the predetermined direction, The conversion lever is formed in a substantially triangular shape when viewed from above, and a portion that is directly or indirectly pressed by the rack gear includes at least two continuous straight lines. The door opening assistance device according to claim 1 or 2.

7. The device further includes a receiving portion provided so as to be capable of contacting a contact portion that advances and retreats from a device body having at least the motor, the plurality of driven gears, and the conversion portion, The receiving portion is attached to the door frame, The device body is attached to the door, The conversion unit further includes a conversion lever, The contact portion of the conversion lever smoothly contacts the receiving portion. The door opening assistance device according to claim 1 or 2.

8. a device body having at least the motor, the plurality of driven gears, and the conversion unit; a receiving portion provided so as to be capable of contacting a contact portion moving forward and backward from the device body; Further equipped with The device body is attached to the upper edge of the door, The receiving portion is attached to the door frame. The door opening assistance device according to claim 2.

9. a device body having at least the motor, the plurality of driven gears, and the conversion unit; a receiving portion provided so as to be capable of contacting a contact portion moving forward and backward from the device body; Further equipped with The device body is attached to the door, The receiving portion is attached to the door frame, When the door is closed, the device main body is disposed in an internal space formed by a first exterior member disposed on the indoor side and a second exterior member disposed on the outdoor side. The door opening assistance device according to claim 2.

10. A cover portion for covering the device body is provided, The cover portion has an opening for exposing the operation button of the cutting portion and the contact portion. The door opening assistance device according to claim 8 or 9.

11. The conversion unit is The rack gear; A rotating member attached to an end of the rack gear and rotatable about a first axis; a swing lever provided so as to be swingable about a second axis; a conversion lever that is pressed by the rotating member and is provided so as to be able to swing together with the swing lever around the second shaft; Equipped with The door opening assistance device according to claim 1 or 2.

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