Door handle device

Abstract

To provide a handle device for a door capable of preventing collision of a handle roller and a door frame by an energizing mechanism that uses an elastic force of a spring, and also preventing the door from opening naturally.SOLUTION: An energizing mechanism 5 includes: a coil spring 33; a joint part 31 that corotates one winding end part of the coil spring 33 around an axis line C1 corresponding to turning of a handle 4; and a spring support part 32 that receives the other winding end part of the coil spring 33 such that the coil spring 33 oscillates relative to a base 3 in response to corotation by the joint part 31. Thus, when the handle 4 is in a predetermined turning position, the orientation of energizing the handle 4 in one direction or the other direction by an elastic force of the coil spring 33 is switched.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a handle device used for opening and closing a door.

Background Art

[0002] Conventionally, as a handle device provided on a single-opening door, there has been used one including a pedestal fixed to the door, a handle with a roller rotatably supported around an axis with respect to the pedestal, and a biasing mechanism that biases the handle in a direction around the axis.

[0003] When this type of door handle device is in a closed door state and the handle is rotated in one direction around the axis while the door is in contact with the door stop of the door frame, the roller is pressed against the inclined surface of the engaging portion provided on the door frame, whereby the door is pulled toward the door stop of the door frame. When the handle is rotated to the limit in one direction, the roller stops in a state of strongly contacting the engaging portion. When opening the door, when the handle is rotated in the other direction, the pulling force of the door gradually weakens. While the handle is rotated to the limit in the other direction, the roller moves away from the engaging portion and is retracted to a position where it cannot collide with the door frame.

[0004] This type of door handle device is used for soundproof doors and airtight doors. In the case of soundproof doors and airtight doors, an elastic member is provided on the door or the door stop of the door frame. When the elastic member is compressed by the aforementioned pulling of the door, the adhesion between the door and the door stop is increased, and the soundproofing and airtightness between the door and the door frame can be enhanced.

[0005] As the biasing mechanism of this type of door handle device, a mechanism that biases the handle in one direction around the axis (the direction of rotation for closing the door) or in the other direction (the direction of rotation for opening the door) using the elastic force of a spring is common.

[0006] When provided with a biasing mechanism that can bias the handle in only one direction, when the door is closed, even if the handle tries to rotate in the other direction due to its own weight, the biasing force that resists this prevents the handle from rotating in the other direction, and the stopping position of the roller with respect to the engaging portion of the door frame is appropriately maintained, so the door will not open naturally. On the other hand, when there is insufficient rotation of the handle in the other direction when opening the door, the biasing force holds the roller at a position where it can collide with the door frame. If the handle operator opens the door without noticing this, the roller may collide with the door frame.

[0007] On the other hand, when provided with a biasing mechanism that can bias the handle in only the other direction, when opening the door, the biasing force prevents insufficient rotation of the handle in the other direction, so it is possible to prevent the roller from colliding with the door frame. On the other hand, if the contact between the roller and the engaging portion of the door frame when the door is closed becomes improperly loose, the biasing force may rotate the handle in the other direction on its own, and the door may open naturally.

[0008] Thus, when biasing the handle in either one direction or the other direction, there are pros and cons. Therefore, a biasing mechanism has been proposed (Patent Document 1) that biases the handle closer to one direction to rotate in one direction and biases the handle closer to the other direction to rotate in the other direction with a predetermined rotation position located in the middle of the rotatable range of the handle as a boundary.

[0009] The biasing mechanism disclosed in Patent Document 1 utilizes magnetic attraction and magnetic repulsion between the magnetic force of a permanent magnet provided on the handle and the magnetic force of a permanent magnet provided on the pedestal to bias the handle closer to one direction to rotate in one direction with respect to the middle position in the rotatable range of the handle, and bias the handle closer to the other direction to rotate in the other direction. Therefore, the door handle device of Patent Document 1 can prevent the roller from colliding with the door frame when opening and closing the door, and prevent the door from opening naturally with a biasing mechanism having a simple structure using permanent magnets.

Prior Art Documents

Patent Documents

[0010] Patent Document 1 Japanese Unexamined Patent Application Publication No. 2017-66815 Summary of the Invention Problems to be Solved by the Invention

[0011] However, if a biasing mechanism using the magnetic force of a permanent magnet is provided in a door handle device as in Patent Document 1, wear powder of iron-based members or magnetic particles in the surrounding environment will be attracted to the permanent magnet during long-term use and accumulate in the gap between the handle and the pedestal, which may cause malfunction or soiling on the appearance.

[0012] In view of the above background, the problem to be solved by this invention is to provide a door handle device that can prevent the collision between the roller of the handle and the door frame and prevent the natural opening of the door by a biasing mechanism using the elastic force of a spring. Means for Solving the Problems

[0013] To achieve the above problems, this invention provides a door handle device comprising a pedestal fixed to a door, a handle with a roller rotatably supported around an axis with respect to the pedestal, and a biasing mechanism that biases the handle closer to one side in one direction around the axis to rotate in that one direction with a predetermined rotation position located in the middle of the rotatable range of the handle as a boundary, and biases the handle closer to the other side in the other direction around the axis to rotate in that other direction with the predetermined rotation position as a boundary. In the door handle device, the biasing mechanism adopts a configuration having a coil spring, a joint portion that rotates around the axis in accordance with the rotation of the handle with one winding end of the coil spring, and a spring support portion that receives the other winding end of the coil spring so that the coil spring swings with respect to the pedestal in accordance with the rotation by the joint portion.

[0014] According to the above configuration, as the handle rotates around its axis, the joint part rotates the one end winding part of the coil spring, and according to this rotation, the spring support part receives the other end winding part of the coil spring so that the coil spring swings with respect to the pedestal. Therefore, the direction in which the handle is biased by the elastic force of the coil spring is changed according to the rotation of the handle, and it is possible to switch the direction in which the handle is biased to rotate in one direction or the other direction by the elastic force of the coil spring with respect to a predetermined rotation position of the handle as a boundary. Therefore, when configuring the doorway opening and closing device with this door handle device, the door, and the door frame, by appropriately determining the arrangement of the door handle device with respect to the door and the door frame, when the door is closed, the handle is biased so that the stop position of the roller with respect to the door frame is appropriately maintained to prevent the natural opening of the door, while when opening the closed door, the handle is biased so that insufficient rotation of the handle in the other direction is prevented to prevent the collision between the roller and the door frame.

Effect of the Invention

[0015] As described above, by adopting the above configuration, the present invention can provide a door handle device capable of preventing the collision between the roller of the handle and the door frame and preventing the natural opening of the door by an urging mechanism using the elastic force of a spring.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0017] The door handle device according to the first embodiment as an example of the present invention will be described with reference to the accompanying drawings

[0018] The door handle device 1 shown in FIGS. 1 to 3 includes a pedestal 3 fixed to the door 2, a handle 4 rotatably supported around an axis C1 with respect to the pedestal 3, and a biasing mechanism 5 that biases the handle 4

[0019] Hereinafter, the direction along the axis C1, which is the rotation center axis of the handle 4, will be simply referred to as the "axial direction", the direction orthogonal to the axis C1 will be simply referred to as the "radial direction", the circumferential direction of rotating in one direction around the axis C1 will be simply referred to as the "one direction", and the circumferential direction of rotating in the other direction opposite to the one direction around the axis C1 will be simply referred to as the "other direction". The axial direction corresponds to the front-back direction of the door 2, the door frame 6, and the door handle device 1

[0020] The illustrated door handle device 1 is an example assembled for right-handed use. That is, it is a door handle device 1 in which the hinge side (hinge) side of the door 2 is located on the right side and the door end side of the door 2 is located on the left side when facing the front (visible surface) of the single-leaf door 2, and the pedestal 3 is arranged on the door end side of the front of the right-handed door 2

[0021] The pedestal 3 is a part that always remains stationary with respect to the handle 4 and the door 2 when attached to the door 2, and includes a part that supports the axial and radial loads from the handle 4

[0022] The handle 4 consists of a part that always moves integrally in the direction around the axis C1 with respect to the pedestal 3 and the door 2. The range in which the handle 4 can rotate around the axis C1 with respect to the pedestal 3, the door 2, and the door frame 6 is limited to a certain extent. The rotatable range of the handle 4 is from the position where the handle 4 rotates to the limit in one direction (position a drawn with a solid line in FIG. 1) to the position where the handle 4 rotates to the limit in the other direction (position b drawn with a one-dot chain line in FIG. 1). The rotatable range of the handle 4 in the illustrated example is set within a range of 70° in terms of the angle around the axis C1.

[0023] The biasing mechanism 5 is a mechanism that biases the handle 4 biased toward one direction around a predetermined rotation position (position c drawn with a two-dot chain line in FIG. 1) located in the middle of the rotatable range of the handle 4 to rotate in one direction, and biases the handle 4 biased toward the other direction around the position c to rotate in the other direction.

[0024] As shown in FIGS. 1, 3, and 4, the pedestal 3 includes a case main body 7 and a case lid 8 coupled thereto. Note that FIGS. 1 and 3 show the state where the case lid 8 is removed. The case main body 7 has a front wall that forms the front of the pedestal 3 and a peripheral side wall that protrudes rearward from the front wall, and has a shape that is open on the back side with respect to the front wall. The case main body 7 is in a surface-fastening shape that is fastened to the front of the door 2 as shown in FIG. 2. The case lid 8 shown in FIG. 4 is fastened to the back side of the case main body 7.

[0025] As shown in FIGS. 3 and 4, an opening 9 that penetrates the pedestal 3 in the axial direction is formed in the pedestal 3. Between the front wall and the peripheral side wall of the case main body 7 and the case lid 8, it forms a series of internal space 10 with the opening 9. The opening 9 and the internal space 10 are spaces for arranging the supported portion of the handle 4 and the biasing mechanism 5. Between the front wall of the case main body 7 and the supported portion of the handle 4, a collar 11 and a sliding member 12 are arranged. The handle 4 is supported axially and radially by the case main body 7 of the pedestal 3 via the collar 11 and the sliding member 12. The collar 11 and the sliding member 12 are parts for improving the slidability when the handle 4 rotates.

[0026] As shown in FIGS. 1 and 3, the handle 4 includes a handle body 13, a roller 14 for bringing the door 2 into close contact with the door frame 6, a link plate 15 fitted to the handle body 13, and a handle nut 16 coupled to the handle body 13.

[0027] The handle body 13 includes an axial center portion 17 inserted into the opening 9 and the internal space 10 of the pedestal 3, an external shaft portion 18 that always faces the front of the pedestal 3 in the axial direction outside the pedestal 3, a gripping portion 19 protruding radially from the external shaft portion 18, and an interference base portion 20 protruding radially from the external shaft portion 18 in a direction different from that of the gripping portion 19.

[0028] With the inner circumference of the link plate 15 fitted to the axial center portion 17 of the handle body 13, the handle nut 16 is threadedly engaged with the axial center portion 17, so that the handle body 13, the link plate 15, and the handle nut 16 are integrated. Due to this integration, the external shaft portion 18 is axially supported on the front of the front wall of the pedestal 3 via the collar 11, the outer circumference of the axial center portion 17 is radially supported on the inner circumference of the opening 9 of the pedestal 3 via the collar 11, and the link plate 15 is axially supported on the back of the front wall of the pedestal 3 via the recessed member 12, thereby forming a rotation shaft portion of the handle 4 centered on the axis C1.

[0029] The handle 4 can be rotated in one direction or the other by an operation that applies torque in one direction or the other to the gripping portion 19 of the handle body 13.

[0030] The interference base portion 20 of the handle body 13 rotatably holds the roller 14. The roller 14 is formed of a hollow cylindrical body. The interference base portion 20 has a support shaft extending in the radial direction. The roller 14 is fitted to the support shaft of the interference base portion 20 on the inner circumference of its hollow portion. The roller 14 can roll about a rolling axis in the radial direction.

[0031] As shown in FIGS. 1, 2, and 5, the roller 14 is pressed against the engaging portion 21 of the door frame 6 by a one-way rotation of the handle 4 and is separated from the engaging portion 21 by a reverse rotation of the handle 4.

[0032] The door frame 6 has a door stop portion 23 that receives the front door tip portion 22 of the door 2. The door stop portion 23 has an elastic member 24 and a frame portion 25 that supports the elastic member 24. The elastic member 24 is disposed on the back side with respect to the frame portion 25. The engaging portion 21 is disposed on the front side with respect to the frame portion 25. The door frame 6 and the handle 4 can only come into contact at the engaging portion 21 and the roller 14. The engaging portion 21 has an inclined surface 26 that is inclined toward the front side upward and an engaging surface 27 along the vertical direction with respect to the horizontal. The engaging portion 21 is detachably provided on the frame portion 25 as a receiving member.

[0033] When the roller 14 is pressed against the inclined surface 26 of the door frame 6, the front door tip portion 22 of the door 2 is pulled toward the door frame 6 so that the elastic member 24 of the door frame 6 is crushed by the door 2, and the door 2 and the elastic member 24 are brought into close contact. Thereby, the sound insulation and airtightness between the door 2 and the door frame 6 can be improved.

[0034] As the handle 4 rotates in one direction, the roller 14 climbs over the inclined surface 26 of the door frame 6. When the handle 4 reaches the position a where it rotates to the limit in one direction, the roller 14 stops in contact with the engaging surface 27 of the door frame 6.

[0035] The link plate 15 of the handle 4 is a connecting element for transmitting torque in the direction around the axis C1 between the handle 4 and the biasing mechanism 5 as shown in FIGS. 3 and 6. The link plate 15 is made of an annular plate material. An axial through hole 28 for connecting to the biasing mechanism 5 is formed in the link plate 15. The axial through hole 28 penetrates axially between both plate surfaces of the link plate 15. Engaging portions 29, 30 that can engage with each other in one direction and the other direction are formed on the inner circumference of the link plate 15 and the axial center portion 17 of the handle body 13. By the engagement of the engaging portions 29, 30, the handle body 13 and the link plate 15 can always perform displacement in the rotational direction integrally when rotating around the axis C1 of the handle 4.

[0036] The biasing mechanism 5 shown in FIGS. 1 and 4 includes a joint portion 31 that is rotatably coupled to the handle 4 about a first joint axis C2, a spring support portion 32 that is rotatably coupled to the pedestal 3 about a second joint axis C3, and a coil spring 33 interposed between the joint portion 31 and the spring support portion 32.

[0037] The joint portion 31 is composed of a single first link member that is connected to the link plate 15 by the first joint shaft 34. The spring support portion 32 is composed of a single second link member that is connected to the case body 7 and the case lid 8 by the second joint shaft 35. The coil spring 33 is a compression coil spring.

[0038] The first joint axis C2 coincides with the central axis of the first joint shaft 34. The second joint axis C3 coincides with the central axis of the second joint shaft 35. The first joint axis C2 and the second joint axis C3 are set in the axial direction. Hereinafter, the direction along an imaginary straight line L orthogonal to the first joint axis C2 and the second joint axis C3 is referred to as the straight line L direction.

[0039] The joint portion 31 integrally has a head 36 that receives one wound end portion of the coil spring 33, a shaft through hole 37 that fits onto the first joint shaft 34, a slit 38 that inserts near the shaft through hole 28 of the link plate 15, and a shaft 39 that extends in the straight line L direction from the head 36.

[0040] The head 36 has a stepped shaft shape that tapers toward the second joint axis C3 side in the straight line L direction. The large-diameter shaft portion of the head 36 receives one wound end portion of the coil spring 33 in the straight line L direction. The small-diameter shaft portion of the head 36 supports the coil spring 33 in the circumferential winding diameter direction and guides the inside of the coil spring 33 in the straight line L direction.

[0041] The axial through-hole 37 and the slit 38 of the joint portion 31 are formed on the large-diameter shaft portion of the head 36. The axial through-hole 37 penetrates the large-diameter shaft portion of the head 36 in the axial direction and is formed in a stepped-hole shape having a hole center line in the axial direction. The slit 38 forms a space extending in the radial direction so as to be orthogonal to the large-diameter hole portion of the axial through-hole 37, and receives both plate surfaces around the axial through-hole 28 of the link plate 15 in the axial direction.

[0042] The first joint shaft 34 consists of a single stepped shaft. The large-diameter shaft portion of the first joint shaft 34 fits into both axial through-holes 37 and 28 of the joint portion 31 and the link plate 15. The small-diameter shaft portion of the first joint shaft 34 fits into the small-diameter hole portion of the axial through-hole 37. By caulking where the small-diameter shaft portion of the first joint shaft 34 protrudes from the small-diameter hole portion of the axial through-hole 37, the first joint shaft 34 is prevented from coming off so as to maintain a fixed position in the axial direction with respect to the head 36 and the link plate 15, and is always displaceable integrally with the link plate 15 around the axis C1 when rotating around the axis C1 of the handle 4. At the same time, the joint portion 31 and the link plate 15 are connected in a state where they can swing relatively around the first joint axis C2.

[0043] The shaft 39 of the joint portion 31 is passed through the inside of the coil spring 33 and is combined with the spring support portion 32 at the shaft portion on the side opposite to the head 36. The side of the joint portion 31 opposite to the head 36 is guided in the direction of the straight line L by the spring support portion 32.

[0044] The spring support portion 32 integrally has a flat surface 40 for receiving the other wound end portion of the coil spring 33, a slide hole 41 that penetrates the spring support portion 32 in the direction of the straight line L from the flat surface 40, and an axial through-hole 42 that extends in the axial direction so as to be orthogonal to the slide hole 41.

[0045] The flat surface 40 of the spring support portion 32 receives the other wound end portion of the coil spring 33 in the direction of the straight line L. The shaft 39 of the joint portion 31 passes through the slide hole 41 of the spring support portion 32. The spring support portion 32 can slide relative to the shaft 39 in the direction of the straight line L in the slide hole 41. The shaft through hole 42 of the second joint shaft 35 and the spring support portion 32 is bisected in the direction of the second joint axis C3 into the front wall side of the case body 7 and the case lid 8 side by the slide hole 41 in order to allow the shaft 39 to penetrate the slide hole 41. One split shaft portion 35a of the second joint shaft 35 is integrally formed on the front wall of the case body 7. The other split shaft portion 35b of the second joint shaft 35 is fixed to the case lid 8 by press-fitting into a pin hole 43 formed in the case lid 8. By fitting the shaft through hole 42 of the spring support portion 32 to one split shaft portion 35a, fitting the other split shaft portion 35b fixed to the case lid 8 to the pin hole 43, and fastening the case lid 8 to the case body 7, the spring support portion 32 is always connected to the pedestal 3, the handle 4, and the coil spring 33 in a state where it cannot move in the direction of the straight line L and can swing relative to the pedestal 3 around the second joint axis C3.

[0046] The coil spring 33 is held by the head 36 of the joint portion 31 and the flat surface 40 of the spring support portion 32 so that the direction of the winding axis of the coil spring 33 is the direction of the straight line L.

[0047] The coil spring 33 is interposed between the joint portion 31 and the spring support portion 32 in a pre-compressed state so as to be able to apply an elastic force in the direction of the straight line L to the joint portion 31 and the spring support portion 32 throughout the entire rotatable range of the handle 4. The elastic force of the coil spring 33 is transmitted in the order of the joint portion 31, the first joint shaft 34, the link plate 15, and the handle body 13.

[0048] The joint part 31, the coil spring 33, and the spring support part 32 form a link with variable length in the direction of the straight line L. The pair that connects this link to the handle 4 side is composed of a link plate 15, a first joint shaft 34, and a head 36 so as to have one degree of freedom of rotation around the first joint axis C2. On the other hand, the pair that connects this link to the pedestal 3 side is composed of a shaft 39 of the joint part 31, a spring support part 32, and a second joint shaft 35 so as to have two degrees of freedom of rotation around the second joint axis C3 and sliding in the direction of the straight line L.

[0049] As shown in FIG. 1, as the handle 4 rotates around the axis C1, the joint part 31 is rotated along with the first joint shaft 34 on the handle 4 side, while the spring support part 32 cannot rotate around the axis C1 with respect to the handle 4. That is, the first joint axis C2 moves integrally with the rotation of the handle 4, while the second joint axis C3 remains in a fixed position with respect to the handle 4 and the pedestal 3. For this reason, as the handle 4 rotates around the axis C1, the joint part 31 rotates along with one winding end of the coil spring 33, and a torque around the second joint axis C3 is applied from the other winding end of the coil spring 33, causing the spring support part 32 that supports the other winding end of the coil spring 33 to rotate around the second joint axis C3, and the direction of supporting the other winding end of the coil spring 33 by the spring support part 32 changes. For this reason, the joint part 31, the coil spring 33, and the spring support part 32 swing relatively to the handle 4 around the first joint axis C2 while swinging relatively to the pedestal 3 around the second joint axis C3. Along with this swing, the shaft 39 of the joint part 31 and the slide hole 41 of the spring support part 32 slide relatively in the direction of the straight line L, and the distance in the direction of the straight line L between the joint part 31 and the spring support part 32 changes, so that the compression amount (elastic force) of the coil spring 33 changes. When the handle 4 is in a predetermined rotation position (position c), the direction of the straight line L is orthogonal to the axis C1, and the compression amount of the coil spring 33 becomes maximum. As the handle 4 moves away from the position c in one direction or the other direction, the compression amount of the coil spring 33 becomes smaller.

[0050] In addition, a torque having a direction and magnitude corresponding to the elastic force of the coil spring 33, the direction of the straight line L, and the positional relationship of the axes C1 to C3 acts on the handle 4. When the handle 4 moves toward one direction with the position c where the axis C1 is located on the extension of the straight line L as a boundary, this torque causes the handle 4 to rotate in one direction, and when the handle 4 moves toward the other direction with the position c as a boundary, this torque causes the handle 4 to rotate in the other direction. In this way, the direction in which the elastic force of the coil spring 33 biases the handle 4 to rotate in one direction or the other direction switches with the position c as a boundary as the joint portion 31, the spring support portion 32, and the coil spring 33 swing with respect to the pedestal 3 and the handle 4 in response to the rotation of the handle 4 around the axis C1.

[0051] The position c is set at a position closer to one direction than the intermediate position that bisects the rotatable range of the handle 4. More specifically, the position c is set at a handle rotation position where the roller 14 comes off the slope 26 of the door frame 6 toward the other direction and protrudes from the door tip of the door 2 toward the door frame 6 side. In the illustrated example, the position c is the position where the handle 4 has rotated 25° in the other direction from the position (position a) where the handle 4 has rotated to the limit in one direction, in other words, the position where the handle 4 has rotated 45° in one direction from the position (position b) where the handle 4 has rotated to the limit in the other direction.

[0052] The magnitudes of the one-direction torque and the other-direction torque acting on the handle 4 based on the elastic force of the coil spring 33 are set to be large enough to keep the handle 4 at the corresponding position a or position b against the torque due to the self-weight of the handle 4.

[0053] An operator (not shown) who closes the door 2 turns the handle 4 at position b in one direction when bringing the door 2 into close contact with the elastic member 24 of the door frame 6 (hereinafter, refer to FIGS. 1, 2, and 5 as appropriate). While the handle 4 rotates in one direction from position b to position c, the biasing mechanism 5 resists, so the operator turns the handle 4 forcefully to overcome this resistance. Subsequently, while the handle 4 rotates in one direction from position c to position a, the one-way torque by the biasing mechanism 5 acts on the handle 4, and the assistance for the operator's manual handle turning operation increases. During this time, the roller 14 gets over the slope 26 and reaches the engagement surface 27. When the handle 4 reaches position a, the one-way torque by the biasing mechanism 5 overcomes the other-direction torque due to the dead weight of the clamping base 20 and is in a state where the handle 4 can be held at position a. Therefore, even if the operator releases the hand from the handle 4, the handle 4 will not rotate in the other direction by itself due to the other-direction torque by the dead weight of the handle 4. As a result, the stop position of the roller 14 with respect to the door frame 6 is appropriately maintained, and the natural opening of the door 2 is prevented.

[0054] On the one hand, an operator who opens the door 2 closely attached to the door frame 6 will turn the handle 4 at position a in the other direction. While the handle 4 rotates in the other direction from position a to position c, the biasing mechanism 5 resists, so the operator turns the handle 4 vigorously to overcome this resistance. During this time, the roller 14 descends from the engagement surface 27 to the inclined surface 26 and disengages from the inclined surface 26, and the door 2 opens slightly with the elastic restoration of the elastic member 24. However, the roller 14 still protrudes from the door tip of the door 2 toward the door frame 6 side. Subsequently, while the handle 4 rotates in the other direction from position c to position b, the other-direction torque by the biasing mechanism 5 acts on the handle 4, and the assistance for the operator's manual handle-turning operation increases. During this time, the roller 14 reaches a position where it does not protrude from the door tip of the door 2 toward the door frame 6 side, that is, a position where it cannot collide with the door frame 6. When the handle 4 reaches position b, the other-direction torque by the biasing mechanism 5 overcomes the one-direction torque by the self-weight of the gripping portion 19 and is in a state where the handle 4 can be held at position b. Therefore, even if the operator releases the hand from the handle 4, the handle 4 will not rotate in one direction on its own due to the one-direction torque by the self-weight of the gripping portion 19. Thereby, insufficient rotation of the handle 4 in the other direction is prevented, and the collision between the roller 14 of the handle 4 and the door frame 6 is prevented.

[0055] Particularly, in the case of an operator who is in a hurry to open a thick and heavy door 2 such as a soundproof door or an airtight door, when the small opening of the door 2 due to the elastic restoration of the elastic member 24 stops, the operator may misunderstand that the unlocking of the door 2 is completed, stop the manual turning operation of the handle 4 near position c, and may violently push open the door 2 by hitting the front of the door 2 directly. Even when such a violent door-opening operation is performed, at the small-opening stop position of the door 2 (that is, the position where the roller 14 disengages from the inclined surface 26 and does not pull the door 2) and the position where the roller 14 protrudes from the door tip of the door 2 toward the door frame 6 side (that is, the position where the roller 14 may collide with the door frame 6 when the door 2 is opened), taking position c as a boundary, the other-direction torque by the biasing mechanism 5 acts on the handle 4. Therefore, insufficient rotation of the handle 4 in the other direction can be effectively prevented, and the collision between the roller 14 and the door frame 6 can be prevented.

[0056] In the vicinity of the position c, the moment arm between the contact portion that transmits the elastic force from the first joint axis 34 to the link plate 15 and the axis C1 becomes relatively short. However, at the position c, the distance between the first joint axis C2 and the second joint axis C3 is the shortest, and the elastic force of the coil spring 33 becomes the maximum. Therefore, even in the vicinity of the position c, it is possible to make the torque in the other direction by the biasing mechanism 5 larger than the torque in one direction by the self-weight of the gripping portion 19. As a result, even when the operator releases his hand from the handle 4 immediately after the small opening stop of the door 2 described above, the handle 4 is quickly rotated in the other direction by the biasing mechanism 5.

[0057] In the illustrated example, the door handle device 1 assembled for right-handed use is illustrated. However, for this door handle device 1, the direction of the link plate 15 is switched to the front-back direction and meshed with the handle body 13, the directions of the joint portions 31 to the coil spring 33 are switched to the front-back direction, and the split shaft portion 35a provided on the left side of the pedestal 3 in FIG. 1 and the pin hole (not shown) of the case lid are used to connect the pedestal 3 and the second joint axis. By doing so, it is also possible to assemble it for left-handed use.

[0058] As described above, this door handle device 1 has a biasing mechanism 5 including a coil spring 33, a joint portion 31 that rotates one winding end portion of the coil spring 33 around the axis C1 in accordance with the rotation of the handle 4, and a spring support portion 32 that receives the other winding end portion of the coil spring 33 so that the coil spring 33 swings with respect to the pedestal 3 in accordance with the rotation of one winding end portion of the coil spring 33 by the joint portion 31. Therefore, the direction in which the handle 4 is biased by the elastic force of the coil spring 33 is changed in accordance with the rotation around the axis C1 of the handle 4, and the direction in which the handle 4 is biased to rotate in one direction or the other direction by the elastic force of the coil spring 33 can be switched with the predetermined rotation position (position c) of the handle 4 as a boundary. Accordingly, when configuring a doorway opening / closing device with this door handle device 1, the door 2, and the door frame 6, by appropriately determining the arrangement of the door handle device 1 with respect to the door 2 and the door frame 6, when the door 2 is in the closed state, the handle 4 is biased so that the stop position of the roller 14 with respect to the door frame 6 is appropriately maintained to prevent the natural opening of the door 2, while when opening the closed door 2, the handle 4 is biased so that insufficient rotation of the handle 4 in the other direction is prevented to prevent a collision between the roller 14 and the door frame 6.

[0059] Further, in this door handle device 1, the joint portion 31 is coupled to the handle 4 so as to be relatively rotatable about the first joint axis C2, and the spring support portion 32 is coupled to the pedestal 3 so as to be relatively rotatable about the second joint axis C3. The first joint axis C2 and the second joint axis C3 are in the direction along the axis C1. The joint portion 31 includes a head 36 that receives the coil spring 33 in a direction along a straight line L orthogonal to the first joint axis C2 and the second joint axis C3, and a shaft 39 that extends in a direction along the straight line L from the head 36, and is formed of a first link member. The spring support portion 32 is formed of a second link member that receives the coil spring 33 in the direction along the straight line L and relatively slides in the direction along the straight line L with the shaft 39. Therefore, in response to the rotation of the handle 4 about the axis C1, the joint portion 31, the spring support portion 32, and the coil spring 33 swing with respect to the handle 4 about the first joint axis C2 and swing with respect to the pedestal 3 about the second joint axis C3, and the direction in which the handle 4 is biased by the elastic force of the coil spring 33 changes. As a result, this door handle device 1 constitutes a link having a variable length in the direction along the straight line L with three members (31 to 33), and the biasing mechanism 5 can be realized by a simple link mechanism that connects this link to the pedestal 3 and the handle 4 with two pairs of joints.

[0060] In the first embodiment, an example in which the spring support portion 32 of the biasing mechanism 5 is provided so as to be rotatable with respect to the pedestal 3 is shown. However, it is also possible to realize the biasing mechanism by fixing the spring support portion to the pedestal. A second embodiment as an example thereof is shown in FIGS. 7 to 8. In the following, only the differences from the first embodiment will be described.

[0061] The spring support portion 51 of the biasing mechanism 50 according to the second embodiment is formed of a cylindrical member integrally having a pair of shaft restricting surfaces 52 and 53 having an opening angle of 70° toward the upper side and a pair of shaft restricting surfaces 54 and 55 having an opening angle of 70° toward the lower side. The spring support portion 51 is fixed to the back surface of the case body 7 by screwing.

[0062] The shaft 39 of the joint portion 31 passes through the space between the pair of upper shaft regulating surfaces 52 and 53 and the space between the pair of lower shaft regulating surfaces 54 and 55. The upper shaft regulating surface 53 and the lower shaft regulating surface 54 are along the first direction with respect to each other, and the upper shaft regulating surface 52 and the lower shaft regulating surface 55 are along the second direction (a direction forming a crossing angle of 70° with the first direction) with respect to each other. For this reason, the shaft 39 can swing with respect to the spring support portion 51 on the pedestal 3 side according to the rotation of the handle 4 between the position a and the position b.

[0063] The flat surface 56 of the spring support portion 51 extends along a direction perpendicular to the helical axis of the coil spring 33 when the handle 4 is at the position c. Therefore, when the handle 4 is at the position c, the flat surface 56 can receive the other winding end portion of the coil spring 33 in a direction perpendicular to the flat surface 56, and when the handle 4 is at a rotational position other than the position c such as the positions a and b, the flat surface 56 can receive the other winding end portion of the coil spring 33 in an oblique direction corresponding to the amount of rotation from the position c of the handle 4.

[0064] When the joint portion 31 rotates the one winding end portion of the coil spring 33 according to the rotation of the handle 4, the mountain-shaped ridge portion formed by the upper shaft regulating surface 52 and the lower shaft regulating surface 54, or the mountain-shaped ridge portion formed by the upper shaft regulating surface 53 and the lower shaft regulating surface 55 supports the shaft 39 and regulates the swinging of the shaft 39. The coil spring 33 received by the flat surface 56 as described above can swing with respect to the pedestal 3 around a position corresponding to the position of the second joint axis C3 of the first embodiment generally along with the swinging of the shaft 39. Therefore, also in the second embodiment, as in the first embodiment, the direction in which the handle 4 is urged by the elastic force of the coil spring 33 changes according to the rotation of the handle 4.

[0065] Thus, since the spring support portion 51 is fixed to the pedestal 3 in the biasing mechanism 50 according to the second embodiment, the structure can be made simpler than the biasing mechanism of the first embodiment.

[0066] On the other hand, since the biasing mechanism 5 according to the first embodiment shown in FIG. 1 can always receive the other wound end portion of the coil spring 33 in a constant direction when the handle 4 rotates, the swinging and compression of the coil spring 33 are more stable than in the second embodiment. Therefore, when prioritizing the simplification of the structure, the second embodiment may be adopted, and when prioritizing the stability and durability of the operation, the first embodiment may be adopted.

[0067] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. Therefore, the scope of the present invention is indicated by the scope of the claims, and it is intended that all modifications within the meaning and scope equivalent to the scope of the claims be included.

Explanation of Reference Numerals

[0068] 1 Door handle device 2 Door 3 Pedestal 4 Handle 5, 50 Biasing mechanism 14 Roller 31 Joint portion 32, 51 Spring support portion 33 Coil spring 34 First joint shaft 35 Second joint shaft 36 Head 39 Shaft 40 Flat surface 41 Slide hole

Claims

1. A base fixed to the door, A handle with a roller rotatably supported around an axis with respect to the base, In a door handle device comprising: a biasing mechanism that biases the handle closer to one side around the axis toward rotation in that one direction with a predetermined rotation position located in the middle of the rotatable range of the handle as a boundary, and biases the handle closer to the other side around the axis toward rotation in that other direction with the predetermined rotation position as a boundary, The biasing mechanism includes a coil spring, a joint portion that rotates the one winding end portion of the coil spring around the axis in accordance with the rotation of the handle, and a spring support portion that receives the other winding end portion of the coil spring so that the coil spring swings with respect to the base in accordance with the rotation by the joint portion, The door handle device characterized in that the coil spring is a compression coil spring arranged so as to be in a position closer to the spring support portion side from the axis in a linear direction orthogonal to the axis at the predetermined rotation position.

2. A base fixed to the door, A handle with a roller rotatably supported around an axis with respect to the base, In a door handle device comprising: a biasing mechanism that biases the handle closer to one side around the axis toward rotation in that one direction with a predetermined rotation position located in the middle of the rotatable range of the handle as a boundary, and biases the handle closer to the other side around the axis toward rotation in that other direction with the predetermined rotation position as a boundary, The biasing mechanism includes a coil spring, a joint portion that rotates the one winding end portion of the coil spring around the axis in accordance with the rotation of the handle, and a spring support portion that receives the other winding end portion of the coil spring so that the coil spring swings with respect to the base in accordance with the rotation by the joint portion, The joint portion is relatively rotatably coupled around a first joint axis with the handle, the spring support portion is relatively rotatably coupled around a second joint axis with the base, and the first joint axis and the second joint axis are in a direction along the axis, The joint portion consists of a first link member integrally having a head that receives the coil spring in a direction along a straight line orthogonal to the first joint axis and the second joint axis, and a shaft extending in the direction along the straight line from the head. The spring support portion is composed of a second link member that receives the coil spring in a direction along the straight line and relatively slides in a direction along the axis and the straight line, and is characterized by a door handle device.

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