Retracting device unit

Abstract

This retracting device unit is attached to a frame and a hinged door attached to the frame so as to be openable and closable. The retracting device unit comprises a receiving seat attached to one of the frame and the hinged door, a body attached to the other of the frame and the hinged door, and an arm that is rotatably attached to the body, engages with the receiving seat, and retracts the hinged door toward a closing side. The arm and the receiving seat are connected by closing the hinged door and separated by opening the hinged door. The arm has a spring mechanism, a conversion mechanism for converting the spring force of the spring mechanism into rotational torque for rotating the arm in the direction in which the hinged door is retracted to the closing side, and a damper function for generating damper force that impedes the rotational torque.

Description

Retraction device unit

[0001] This application claims priority to Japanese Patent Application No. 2023-202927, filed on November 30, 2023, the contents of which are incorporated herein by reference.

[0002] Retraction device units that retract hinged doors of buildings or furniture to a closed position are known (see Patent Documents 1 and 2). The retraction device unit includes a retraction device attached to one of the frame and the hinged door, and a striker attached to the other of the frame and the hinged door. The retraction device has an arm that rotates to retract the striker. The arm engages with the striker to retract the striker, thereby retracting the hinged door to the closed position.

[0003] Japanese Patent No. 6732397 Japanese Patent No. 5297554

[0004] However, it is desirable that the retraction device unit be smaller and easier to install.

[0005] In consideration of the above circumstances, an object of the present disclosure is to provide a retraction device unit that is smaller and easier to install.

[0006] In order to solve the above problems, the present disclosure proposes the following means: A retraction device unit according to a first aspect of the present disclosure is a retraction device unit attached to a frame and a hinged door attached to the frame in an openable and closable manner, and includes a striker attached to one of the frame and the hinged door, a main body attached to the other of the frame and the hinged door, and an arm rotatably attached to the main body and engaging with the striker to retract the hinged door to the closing side, the arm and the striker being coupled together when the hinged door is closed and separated when the hinged door is opened, the arm having a spring mechanism, a conversion mechanism that converts the spring force of the spring mechanism into a rotational torque that rotates the arm in a direction that retracts the hinged door to the closing side, and a damper function that generates a damper force that obstructs the rotational torque.

[0007] The retraction device unit of the present disclosure is smaller and easier to install.

[0008] 1 is a perspective view showing a retraction device unit according to a first embodiment; FIG. 2 is an exploded view of a retraction device of the retraction device unit; FIG. 3 is a perspective view of a receiving seat of the retraction device unit; FIG. 4 is a perspective view showing the retraction device unit attached to a hinged door at a left-hand hanging point; FIG. 5 is a perspective view showing the operation of the retraction device to retract the hinged door to the closed position; FIG. 6 is a perspective view showing the operation of the retraction device to retract the hinged door to the closed position; FIG. 7 is a perspective view showing the operation of the retraction device to retract the hinged door to the closed position; FIG. 8 is a cross-sectional view of an arm of the retraction device corresponding to FIG. 5; FIG. 6 is a cross-sectional view of the arm corresponding to FIG. 7; FIG. 8 is a cross-sectional view of the arm corresponding to FIG. 8; FIG. 9 is a graph showing the relationship between arm angle and rotational torque; FIG. 9 is a cross-sectional view of the arm when the hinged door in a closed position is moved to the open side; FIG. 10 is a perspective view showing a different mounting mode of the retraction device unit; FIG. 11 is a view showing a modified conversion mechanism of the retraction device; FIG. 12 is a view showing a modified conversion mechanism; FIG. 13 is a view showing a modified conversion mechanism; FIG. 14 is a view showing a modified retraction device unit; FIG. 15 is a view showing a modified retraction device unit; 10A and 10B are diagrams illustrating a modified example of the retraction device unit, and FIG.

[0009] First Embodiment A retraction device unit 100 according to a first embodiment of the present disclosure will be described with reference to FIGS. 1 to 23. FIG.

[0010] 1 is a perspective view showing a retraction device unit 100. The retraction device unit 100 includes a retraction device 3 attached to a frame 1 and a catch 8 attached to a hinged door 2. The hinged door 2 is a right-hanging door attached to the frame 1 so as to be able to open and close. The retraction device unit 100 is attached to the door tip side of the hinged door 2. The retraction device unit 100 has a retraction function and a damper function, and reliably retracts the hinged door 2 to the closed position while softening the impact when the hinged door 2 is closed.

[0011] In the following description, the closing direction of the hinged door 2 in the opening / closing direction B will be referred to as the "closing side B1," and the opening direction of the hinged door 2 in the opening / closing direction B will be referred to as the "opening side B2."

[0012] 1, the retraction device 3 is attached to the underside of the upper frame 1a of the frame 1. The retraction device 3 includes a main body 4 attached to the frame 1 and an arm 5 attached rotatably to the main body 4.

[0013] 2 is an exploded view of the retraction device 3. The main body 4 is attached to the underside of the upper frame 1a of the frame 1 and rotatably supports the arm 5. The main body 4 includes an upper case 41, a lower case 42, a support 43, and a vertical adjustment mechanism 44.

[0014] The upper case 41 has a semi-cylindrical outer shape. An upper surface 41a of the upper case 41 has through-holes 41d through which fastening members such as screws pass. The upper case 41 is attached to the frame 1 with fastening members such as screws. The upper surface 41a of the upper case 41 contacts the lower surface of the upper frame 1a of the frame 1, and the flat side surface 41b of the upper case 41 contacts the side surface 1c of the closing side B1 of the door stop 1b of the frame 1.

[0015] The upper case 41 has an opening 41h for adjusting the up-down adjustment mechanism 44, and a cover 41c for closing the opening 41h. The cover 41c is detachably attached to the upper case 41.

[0016] The lower case 42 is attached to the upper case 41 from below the upper case 41. Support posts 43 are provided on the lower surface of the lower case 42.

[0017] The support pillar 43 is a generally cylindrical member provided on the lower surface of the lower case 42 and extending downward. The support pillar 43 has a non-circular shape with a portion of the circle cut out in a cross section perpendicular to the vertical direction. The arm 5 is attached to the support pillar 43 so as to be rotatable about a rotation axis RO, which is the central axis of the support pillar 43 extending in the vertical direction.

[0018] The vertical adjustment mechanism 44 is a member that connects the upper case 41 and the lower case 42, and is a fastening member such as a screw. The vertical adjustment mechanism 44 can adjust the vertical position of the lower case 42 relative to the upper case 41. Specifically, the user releases the vertical adjustment mechanism 44 from fastening the upper case 41 and the lower case 42 together, and changes the vertical position of the lower case 42 relative to the upper case 41. The user then refastens the upper case 41 and the lower case 42 together to fix the vertical position of the lower case 42 relative to the upper case 41.

[0019] After attaching the main body 4 to the frame 1, the user can remove the cover 41c and adjust the vertical position of the lower case 42 relative to the upper case 41 by adjusting the vertical adjustment mechanism 44 via the opening 41h. This allows the user to adjust the vertical position of the arm 5 to match the position of the catch 8.

[0020] The arm 5 is attached to the main body 4 so as to be rotatable about a rotation axis RO. The arm 5 has a case 50, an engagement shaft 53, an attachment portion 54, a first fastening member 56, a second fastening member 57, a lid 58, a spring mechanism 6, and a damper mechanism 7.

[0021] The case 50 is formed in a box shape extending in a longitudinal direction A perpendicular to the rotation axis RO of the arm 5 which extends in the vertical direction. The case 50 has a first case 51 and a second case 52. The first case 51 and the second case 52 are connected to each other and face each other in the vertical direction. The case 50 accommodates an attachment portion 54, a spring mechanism 6, and a damper mechanism 7.

[0022] In the following description, the side of the arm 5 facing the rotation axis RO in the longitudinal direction A will be referred to as the "base end side A2," and the side of the arm 5 opposite the rotation axis RO in the longitudinal direction A will be referred to as the "tip side A1." In addition, in the rotation direction R of the arm 5 with the rotation axis RO as the center of rotation, the direction in which the arm 5 rotates when the hinged door 2 is closed will be referred to as the "closing side R1," and the direction in which the arm 5 rotates when the hinged door 2 is opened will be referred to as the "opening side R2."

[0023] The case 50 (first case 51 and second case 52) has a guide wall 50g formed thereon to guide the linear motion of the spring mechanism 6 and the damper mechanism 7 along the longitudinal direction A.

[0024] The case 50 (first case 51 and second case 52) has a guide wall 50h formed thereon to guide the rotational movement of the attachment portion 54 about the rotation axis RO.

[0025] The engagement shaft (engagement portion) 53 is a convex member provided on the tip side A1 of the case 50. The engagement shaft 53 is formed in a shape that can engage with the engagement groove 82. Specifically, the engagement shaft 53 is formed in a cylindrical shape that extends from the case 50 on both sides (upper and lower sides) in the vertical direction.

[0026] The mounting portion 54 is a substantially annular member provided on the base end side A2 of the case 50. The mounting portion 54 is attached to the support column 43 with its axial central axis aligned with the vertical central axis of the support column 43. The mounting portion 54 is attached to the support column 43 of the main body 4 by a first fastening member 56. The non-circular support column 43 fits into a hole of the same shape provided in the mounting portion 54, thereby attaching the mounting portion 54 to the support column 43 of the main body 4 so that the mounting portion 54 cannot rotate relative to the support column 43 of the main body 4. A through-hole 54r is formed in the mounting portion 54, penetrating the mounting portion 54 in the axial direction and extending along the rotational direction R. A cam 55 is formed on the outer periphery of the mounting portion 54.

[0027] The cam 55 is formed on the outer periphery of the mounting portion 54 and is non-rotatable relative to the support column 43 of the main body 4. The outer periphery of the cam 55 has a first outer periphery 55s, a second outer periphery 55t, and an engagement surface 55e. The first outer periphery 55s, the second outer periphery 55t, and the engagement surface 55e are arranged along the rotation direction R from the opening side R2 toward the closing side R1. The first outer periphery 55s and the second outer periphery 55t are continuous outer peripheries.

[0028] The first outer peripheral surface 55s has a constant outer diameter (cam diameter) from the rotation axis RO and a constant curvature. The roller 62 of the spring mechanism 6 slides on the first outer peripheral surface 55s.

[0029] The outer diameter (cam diameter) of the second outer peripheral surface 55t from the rotation axis RO decreases along the rotation direction R. Specifically, the cam diameter of the second outer peripheral surface 55t decreases from the opening side R2 to the closing side R1 along the rotation direction R. The second outer peripheral surface 55t is the surface on which the roller 62 of the spring mechanism 6 slides.

[0030] The engagement surface 55e is a flat surface extending in the radial direction. A normal to the engagement surface 55e faces the opening side R2. The slider 73 of the damper mechanism 7 comes into contact with the engagement surface 55e.

[0031] The second fastening member 57 fastens the first case 51 and the second case 52. The second fastening member 57 is inserted through spaces such as the through-hole 54r, and the first case 51 and the second case 52 are attached to the attachment portion 54 so as to be rotatable about the rotation axis RO.

[0032] The lid 58 is a portion of the case 50 to which the first fastening member 56 and the second fastening member 57 are attached, and is a member that covers the portion opposite the main body 4. The lid 58 is detachably attached to the case 50.

[0033] The spring mechanism 6 is housed in the case 50 and is guided by a guide wall 50g of the case 50 so as to be expandable and contractible along the longitudinal direction A of the case 50. The central axis of the spring mechanism 6 in the expansion and contraction direction passes through the rotation axis RO or near the rotation axis RO. The spring mechanism 6 has a slider 61, a roller 62, a coil spring 63, and a fixed portion 64.

[0034] The slider 61 has a U-shaped support portion 61a that rotatably supports the roller 62 via a shaft 61c that extends in the vertical direction, and a long portion 61b that extends from the support portion 61a to the tip side A1 in the longitudinal direction A. The long portion 61b is inserted inside the coil spring 63.

[0035] The roller 62 is rotatably attached to the shaft 61c. The outer circumferential surface of the roller 62 slides along the outer circumferential surface of the cam 55 (the first outer circumferential surface 55s and the second outer circumferential surface 55t).

[0036] The coil spring 63 is stored in the case 50 so as to be expandable and contractible along the longitudinal direction A of the case 50. The coil spring 63 is a compression spring that applies a biasing force in the direction of expansion in the longitudinal direction A. An end portion on the tip side A1 of the coil spring 63 contacts the fixed portion 64. An end portion on the base side A2 of the coil spring 63 contacts the support portion 61 a of the slider 61.

[0037] The fixing portion 64 fixes the end portion on the tip side A1 of the coil spring 63 to the case 50. That is, the end portion on the tip side A1 of the coil spring 63 is a fixed end, and the end portion on the base side A2 of the coil spring 63 is a free end.

[0038] The damper mechanism 7 is an extendable damper. The damper mechanism 7 is housed in the case 50 so as to be guided by a guide wall 50g of the case 50 and be extendable and slidable along the longitudinal direction A of the case 50. The damper mechanism 7 includes a cylinder 71, a rod 72, and a slider 73.

[0039] The cylinder 71 is a cylindrical member filled with a viscous fluid. The rod 72 is partially inserted into the cylinder 71 and moves relative to the cylinder 71 in a longitudinal direction A. A coil spring (not shown) is built into the cylinder 71, and constantly urges the rod 72 in a direction that causes it to protrude from the cylinder 71.

[0040] The slider 73 is attached to the rod 72 and moves linearly together with the rod 72 in the longitudinal direction A. The slider 73 engages with the engagement surface 55e of the cam 55.

[0041] The damper mechanism 7 is housed in the case 50 in parallel with the spring mechanism 6. That is, the direction of expansion and contraction of the spring mechanism 6 (the direction of the spring force) and the direction of expansion and contraction of the damper mechanism 7 (the direction of the damping force) are substantially the same.

[0042] In the retraction device 3, the main mechanisms, the spring mechanism 6 and the damper mechanism 7, are concentrated in the arm 5, not in the main body 4. Furthermore, the spring mechanism 6 and the damper mechanism 7 are housed in parallel in the case 50. This allows the retraction device 3 to be made smaller.

[0043] 3 is a perspective view of the catch seat 8. The catch seat 8 is attached to the side surface 2a of the hinged door 2. The catch seat 8 is attached to the upper side of the side surface 2a of the hinged door 2, on the door tip side. The catch seat 8 is formed in a substantially rectangular parallelepiped shape extending in the longitudinal direction L. The catch seat 8 includes a bumper 81 and an engagement groove 82.

[0044] The catch 8 has a through-hole 83 through which a fastening member such as a screw passes. The catch 8 is attached to the side surface 2a of the hinged door 2 by a fastening member such as a screw.

[0045] The bumper 81 is a curved surface where the engagement shaft 53 of the arm 5 first comes into contact with the receiving seat 8. The bumper 81 is formed in a sloped shape that is recessed from the side surface 2a.

[0046] The engagement groove (engagement portion) 82 is a groove that engages with the engagement shaft 53 of the arm 5, and extends from the bumper 81 in the longitudinal direction L. The engagement shaft 53 of the arm 5 is inserted into the inside of the engagement groove 82 from an insertion port 84 formed near the bumper 81, and moves toward the door edge while engaging with the engagement shaft 53.

[0047] At least a portion of the through hole 83 is formed inside the engagement groove 82. Therefore, the through hole 83 is difficult to see from the outside even if a cover is not attached to the through hole 83.

[0048] In this embodiment, the catch 8 is attached to the side surface 2a of the hinged door 2 so that the longitudinal direction L of the catch 8 coincides with the width direction of the hinged door 2 and the bumper 81 faces the hanging side.

[0049] 4 is a perspective view showing the retraction device unit 100 attached to the left-hanging hinged door 2B. The outer shapes of the case 50 of the arm 5 and the engagement shaft 53 are formed to be plane-symmetrical with respect to a horizontal plane perpendicular to the up-down direction. Therefore, as shown in FIG. 4, by attaching the arm 5 to the main body 4 with the up-down direction reversed, the retraction device unit 100 can be attached to the left-hanging hinged door 2B.

[0050] Next, the operation of the retraction device unit 100 will be described. Figures 5 to 8 are perspective views showing the operation of the retraction device unit 100 to retract the hinged door 2 to the closed position. Figures 9 to 12 are cross-sectional views of the arm 5 corresponding to Figures 5 to 8. The arm 5 and the catch 8 are coupled together when the hinged door 2 is closed, and are separated when the hinged door 2 is opened.

[0051] In the following description, the angle formed between the direction C in which the upper frame 1a of the frame 1 extends and the longitudinal direction A of the arm 5 is referred to as "arm angle α."

[0052] 1, before the retraction device 3 performs the retraction operation of the hinged door 2, the arm 5 is not engaged with the catch 8 and is positioned at the standby position P0. The arm 5 positioned at the standby position P0 does not generate a rotational torque T that rotates the arm 5 to the closing side R1.

[0053] As shown in Figures 5 and 9, when the hinged door 2 is closed, the engagement shaft 53 of the arm 5 comes into contact with the bumper 81 of the catch 8. The arm 5 moves to the first position P1. When the arm 5 is disposed at the first position P1, the roller 62 of the spring mechanism 6 comes into contact with the first outer peripheral surface 55s of the cam 55. Therefore, the arm 5 disposed at the first position P1 does not generate a rotational torque T that rotates the arm 5 toward the closing side R1. Furthermore, when the arm 5 is disposed at the first position P1, the slider 73 of the damper mechanism 7 does not come into contact with the engagement surface 55e of the cam 55. Therefore, the damper mechanism 7 does not stroke in the contracting direction, and the damper force D is not generated.

[0054] The bumper 81 is formed in a sloped shape that is recessed from the side surface 2a, so that the bumper 81 can cushion the impact when the engagement shaft 53 of the arm 5 hits the bumper 81 of the catch 8, thereby reducing contact noise.

[0055] As shown in Figures 6 and 10, when the hinged door 2 is further closed, the engagement shaft 53 of the arm 5 enters the internal space through the insertion opening 84 along the bumper 81 of the catch 8. The arm 5 moves to the second position P2. When the arm 5 is disposed in the second position P2, the roller 62 of the spring mechanism 6 contacts the first outer peripheral surface 55s of the cam 55. Therefore, the arm 5 disposed in the second position P2 does not generate a rotational torque T that rotates the arm 5 toward the closing side R1. Furthermore, when the arm 5 is disposed in the second position P2, the slider 73 of the damper mechanism 7 does not contact the engagement surface 55e of the cam 55. Therefore, the damper mechanism 7 does not stroke in the contracting direction, and the damper force D is not generated.

[0056] 13 is a graph showing the relationship between the arm angle α and the rotational torque T. No rotational torque T that rotates the arm 5 toward the closing side R1 is generated in the arm 5 until the arm 5 moves from the standby position P0 via the first position P1 to the second position P2. The range of movement of the arm 5 from the standby position P0 to the second position P2 is called the "free section (torque non-generation section) E1." The difference in arm angle α between the arm 5 positioned at the standby position P0 and the arm 5 positioned at the second position P2 is, for example, 10 to 12 degrees.

[0057] As shown in Figures 7 and 11, when the hinged door 2 is further closed, the engagement shaft 53 of the arm 5 moves toward the door tip along the engagement groove 82. The arm 5 moves beyond the free section E1 into the retraction section E2 (the third position P3 is part of the retraction section E2). When the arm 5 is positioned in the retraction section (torque generation section) E2, the roller 62 of the spring mechanism 6 contacts the second outer peripheral surface 55t of the cam 55. The first outer peripheral surface 55s is a surface whose cam diameter decreases from the opening side R2 toward the closing side R1 along the rotation direction R. The expanding force of the coil spring 63 of the spring mechanism 6 causes the roller 62 to slide toward the closing side R1. As a result, a rotational torque T is generated in the arm 5 positioned in the retraction section E2, causing the arm 5 to rotate toward the closing side R1.

[0058] That is, the cam 55 is a conversion mechanism that converts the spring force of the spring mechanism 6 into a rotational torque that rotates the arm 5 toward the closing side R1 (the direction in which the hinged door 2 is pulled toward the closing side B1). In this embodiment, the torque generating mechanism (the spring mechanism 6 and the conversion mechanism) that generates the rotational torque T is housed in the arm 5.

[0059] Furthermore, when the arm 5 is positioned in the retraction section E2, the slider 73 of the damper mechanism 7 is in contact with the engagement surface 55e of the cam 55. The damper mechanism 7 is stroking in the contraction direction, pressing the engagement surface 55e of the cam 55, and a damper force D that obstructs the rotational torque T is generated.

[0060] The arm 5 arranged in the retraction section E2 rotates to the closing side R1 due to the rotational torque T that rotates the arm 5 to the closing side R1. As a result, the engagement shaft 53 of the arm 5 engages with the engagement groove 82 of the catch 8, and the hinged door 2 is retracted to the closing side B1. At this time, since a damper force D that obstructs the rotational torque T is generated, the arm 5 rotates slowly to the closing side R1. Therefore, the hinged door 2 is slowly closed toward the closed position.

[0061] As shown in Figures 8 and 12, the arm 5 rotates to the fourth position P4, and the hinged door 2 is retracted securely to the closed position.

[0062] The rotation section in which the arm 5 rotates around the rotation axis RO is divided into a free section (torque non-generation section) E1 and a retracted section (torque generation section) E2. When the arm 5 is positioned in the free section (torque non-generation section) E1, no rotational torque T is generated that rotates the arm 5 toward the closing side R1. When the arm 5 is positioned in the retracted section (torque generation section) E2, a rotational torque T is generated that rotates the arm 5 toward the closing side R1.

[0063] 14 is a cross-sectional view of the arm 5 when the hinged door 2, which is in the closed position, is moved to the opening side B2. When the user moves the hinged door 2 to the opening side B2, the engagement shaft 53 of the arm 5 engages with the engagement groove 82 of the catch 8, causing the arm 5 to rotate to the opening side R2. When the user moves the hinged door 2 further to the opening side B2, the arm 5 separates from the bumper 81 of the catch 8. At this time, the arm 5 is positioned in the free section (non-torque generating section) E1, so no rotational torque T is generated. Therefore, the arm 5 is positioned at a position immediately after it separates from the bumper 81. In other words, every time the hinged door 2 opens, the arm 5 is automatically positioned at the standby position P0 where the engagement shaft 53 can appropriately come into contact with the bumper 81.

[0064] For example, even if the catch 8 is slightly misaligned in the width direction (left-right direction) of the hinged door 2, the arm 5 is automatically positioned at the standby position P0 every time the hinged door 2 opens. Therefore, the main body 4 only needs to have the up-down adjustment mechanism 44, and does not need to have the left-right adjustment mechanism.

[0065] For example, even if the position of the receiving seat 8 in the width direction (left and right direction) is shifted due to deterioration of the hinge of the swing door 2 over time, the arm 5 is automatically positioned at the standby position P0 every time the swing door 2 opens.

[0066] The standby position P0 is not a fixed position but an arbitrary position in the free section E1. The standby position P0 is optimized according to the positions of the catch 8 and the hinged door 2 every time the hinged door 2 opens.

[0067] According to the retraction device unit 100 of this embodiment, the spring mechanism 6 and damper mechanism 7, which are the main mechanisms in the retraction device 3, are concentrated in the arm 5, not in the main body 4. Furthermore, the spring mechanism 6 and the damper mechanism 7 are housed in parallel in the case 50. This allows the retraction device 3 to be made smaller. In addition, the number of parts in the retraction device unit 100 can be reduced.

[0068] According to the retraction device unit 100 of this embodiment, since the retraction device 3 has the vertical adjustment mechanism 44, there is no need to provide the vertical adjustment mechanism in the catch 8, and the catch 8 can be made smaller.

[0069] According to the retraction device unit 100 of this embodiment, a free section E1 is provided in the rotation section of the arm 5, and the arm 5 is automatically positioned at the standby position P0 every time the hinged door 2 opens, resulting in high workability. The standby position P0 of the arm 5 is optimized without being influenced by the position of the catch 8 or the state of the hinge of the hinged door 2, such as deterioration over time. In addition, because the free section E1 is provided in the rotation section of the arm 5, there is little rebound when the hinged door 2 is closed, making it easy to close even when the hinged door 2 is closed slowly.

[0070] Although the first embodiment of the present disclosure has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the present disclosure. Furthermore, the components shown in the above embodiment and the modified examples shown below can be configured by appropriately combining them.

[0071] (Modification 1) In the above embodiment, the retraction device 3 is attached to the frame 1, and the striker 8 is attached to the hinged door 2. However, the retraction device 3 may be attached to the hinged door 2, and the striker 8 may be attached to the frame 1.

[0072] (Modification 2) In the above embodiment, the retraction device unit 100 is attached to the door tip side of the hinged door 2. However, the retraction device unit 100 may also be attached to the hanging side.

[0073] (Modification 3) In the above embodiment, the damper mechanism 7 is a linear damper. However, the damper mechanism 7 may be a rotary damper.

[0074] 15 is a perspective view showing a different mounting mode of the retraction device unit 100. The retraction device unit 100 may be mounted in the opposite direction with respect to the width direction (left-right direction) of the hinged door 2.

[0075] (Variation 5) Figures 16 to 18 are diagrams showing a variation of the conversion mechanism. In the above embodiment, the conversion mechanism that converts the spring force of the spring mechanism 6 into rotational torque that rotates the arm 5 to the closing side R1 is the cam 55. However, the aspect of the conversion mechanism is not limited to this. As shown in Figures 16 to 18, the conversion mechanism may include a link mechanism 59. In this case, the spring mechanism 6 is connected to the cam 55 by the link mechanism 59 rather than by a roller 62.

[0076] 19 to 23 are views showing a retraction device unit 100B, which is a modification of the retraction device unit 100. The retraction device unit 100B includes a retraction device 3B and a catch 8B. The retraction device 3B includes a main body 4 and an arm 5B. Compared to the arm 5, the arm 5B has an engagement groove (engagement portion) 53B instead of the engagement shaft 53. Compared to the catch 8, the catch 8B has an engagement shaft (engagement portion) 82B instead of the engagement groove 82. In other words, in the retraction device unit 100B, the arrangement of the engagement groove and engagement shaft is reversed from that of the retraction device unit 100.

[0077] The present invention can be applied to a device for retracting a hinged door, etc.

[0078] DESCRIPTION OF SYMBOLS 100, 100B, 100C Device unit 1 Frame 1a Upper frame 1c Side surface 2 Swing door (right hanging point) 2a Side surface 2B Swing door (left hanging point) 3, 3B, 3C Retraction device 4, 4C Main body 41 Upper case 41a Top surface 41b Side surface 41c Cover 41d Hole 41h Opening 42 Lower case 43 Support 44 Up / down adjustment mechanism 5, 5B, 5C Arm 50 Case 51 First case 52 Second case 53 Engagement shaft (engagement portion) 53B Engagement groove (engagement portion) 54 Mounting portion 55 Cam 55e Engagement surface 55s First outer peripheral surface 55t Second outer peripheral surface 59 Link mechanism 6 Spring mechanism 61 Slider 62 Roller 64 Fixing portion 7 Damper mechanism 71 Cylinder 72 Rod 73 Slider 8, 8B, 8C Receiver 81 Bumper 82 Engagement groove (engagement portion) 82B Engagement shaft (engagement portion) 84 Insertion opening A Longitudinal direction A1 Tip end side A2 Base end side B Opening / closing direction B1 Closing side B2 Opening side D Damper force E1 Free section (torque non-generation section) E2 Retracted section (torque generation section) L Longitudinal direction P0 Waiting position P1 First position P2 Second position P3 Third position P4 Fourth position R Rotational direction R1 Closing side R2 Opening side RO Rotational shaft T Rotational torque α Arm angle

Claims

1. A retraction device unit attached to a frame and a hinged door attached to the frame so as to be able to open and close, comprising: a receiving seat attached to one of the frame and the hinged door; a main body attached to the other of the frame and the hinged door; and an arm rotatably attached to the main body and engaging with the receiving seat to retract the hinged door to the closing side, wherein the arm and the receiving seat are coupled together when the hinged door is closed and separated when the hinged door is opened, and the arm has: a spring mechanism; a conversion mechanism that converts the spring force of the spring mechanism into a rotational torque that rotates the arm in a direction to retract the hinged door to the closing side; and a damper mechanism that generates a damper force that impedes the rotational torque.

2. The retraction device unit according to claim 1, wherein the arm can be attached to the main body in a reversed orientation relative to a direction along the rotation axis of the arm.

3. The retraction device unit according to claim 2, wherein the outer shape of the arm is formed in a shape that is symmetrical with respect to a plane perpendicular to the rotation axis.

4. The retraction device unit according to claim 1, wherein the conversion mechanism includes a cam.

5. The retraction device unit according to claim 1, wherein the spring mechanism and the damper mechanism are housed in parallel inside the arm.

6. The retraction device unit according to claim 1, wherein the main body has a vertical adjustment mechanism for adjusting the position of the arm in the vertical direction.

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