JP2024018284A - door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the degree of freedom in designing a cam in a door closer provided with the cam.

SOLUTION: The cam includes a first transmission cam surface and a second transmission cam surface which are provided at positions different from each other in a first direction, and a first buffer cam surface and a second buffer cam surface which are provided at positions different from each other in the first direction; a transmission roller includes a first transmission follower 13b facing the first transmission cam surface and a second transmission follower 13a facing the second transmission cam surface; a buffer roller includes a first buffer follower 17a facing the first buffer cam surface and a second buffer follower 17b facing the second buffer cam surface; at a transmission switching angle, a state in which the first transmission cam surface is in contact with the first transmission follower 13b is switched to a state in which the second transmission cam surface is in contact with the second transmission follower 13a; and at a buffer switching angle, a state in which the first buffer cam surface is in contact with the first buffer follower 17a is switched to a state in which the second buffer cam surface is in contact with the second buffer follower 17b.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a door closer equipped with a cam.

In a door closer equipped with a cam as in Patent Document 1 below, the cam elastically deforms a spring when the door opens. In the configuration including the cam in this way, a large closing force can be obtained just before the fully closing. However, the closing force tends to be insufficient at a relatively large opening angle. A cam also moves the buffer piston when the door closes. Therefore, the amount of movement of the buffer piston is small, making it difficult to adjust the flow rate of hydraulic oil. In such a configuration including a cam, there are significant restrictions on the design of the cam.

Special Publication No. 5-20547

An object of the present invention is to increase the degree of freedom in designing a cam in a door closer equipped with a cam.

The door closer according to the present invention includes a main shaft that rotates around an axis in a first direction as the door opens and closes, a cam that is provided on the main shaft and rotates together with the main shaft, a transmission roller that contacts the cam, and a transmission roller that rotates with the main shaft. The slider moves along with the transmission roller in a second direction orthogonal to the first direction, and is elastically deformed by the slider when the door opens, restores itself when the door closes, and applies a closing force to the main shaft via the slider. a closing spring, the cam has a first transmission cam surface and a second transmission cam surface provided at different positions in the first direction, and the transmission roller has a first transmission cam surface facing the first transmission cam surface. The first transmission follower has a first transmission follower and a second transmission follower facing the second transmission cam surface, and from the door closed state to a predetermined transmission switching angle, the first transmission cam surface contacts the first transmission follower and the second transmission follower faces the second transmission cam surface. The cam surface does not contact the second transmission follower, and at the transmission switching angle, the state in which the first transmission cam surface contacts the first transmission follower changes to the state in which the second transmission cam surface contacts the second transmission follower. , at an opening angle larger than the transmission switching angle, the first transmission cam surface does not contact the first transmission follower, and the second transmission cam surface contacts the second transmission follower.

According to this configuration, the cam switches from the first transmission cam surface to the second transmission cam surface at the transmission switching angle. Therefore, compared to a single cam configuration, the degree of freedom in designing the cam is increased, and the closing force can be increased. In particular, the closing force can be increased at relatively large opening angles.

In particular, it is preferable that the first transmission follower and the second transmission follower are provided coaxially with each other, and that the second transmission follower has a larger diameter than the first transmission follower. According to this configuration, the transmission roller can be easily configured.

In addition, the door closer according to the present invention includes a main shaft that rotates around an axis in a first direction as the door opens and closes, a cam that is provided on the main shaft and rotates together with the main shaft, a buffer roller that contacts the cam, and a rotation of the main shaft. a buffer piston that moves in a second direction perpendicular to the first direction together with a buffer roller to buffer the door closing operation, and a buffer spring that biases the buffer piston toward the main shaft. The buffer roller has a first buffer follower facing the first buffer cam surface and a second buffer cam surface facing the second buffer cam surface. From the closed door state to a predetermined buffer switching angle, the first buffer cam surface contacts the first buffer follower, the second buffer cam surface does not contact the second buffer follower, and the buffer switch has two buffer followers. At the switching angle, the state in which the first buffer cam surface contacts the first buffer follower switches to the state in which the second buffer cam surface contacts the second buffer follower, and at an opening angle larger than the buffer switching angle, the first buffer cam surface contacts the first buffer follower. The buffer cam surface does not contact the first buffer follower, and the second buffer cam surface contacts the second buffer follower.

According to this configuration, the cam switches from the first buffer cam surface to the second buffer cam surface at the buffer switching angle. Therefore, compared to a single cam configuration, the degree of freedom in designing the cam is increased, and the amount of movement of the buffer piston can be easily increased. Therefore, the door closing speed can be easily controlled.

In particular, it is preferable that the first buffer follower and the second buffer follower are provided coaxially with each other, and that the first buffer follower has a larger diameter than the second buffer follower. According to this configuration, the buffer roller can be easily configured.

Further, the door closer according to the present invention includes a main shaft that rotates around an axis in a first direction as the door opens and closes, a cam that is provided on the main shaft and rotates together with the main shaft, a transmission roller that contacts the cam, and a rotation of the main shaft. The slider moves along with the transmission roller in a second direction perpendicular to the first direction, and when the door opens, the slider deforms elastically, and when the door closes, it restores itself and applies a closing force to the main shaft through the slider. a closing spring that contacts the cam, a buffer piston that moves in a second direction together with the buffer roller as the main shaft rotates to buffer the door closing operation, and a buffer spring that biases the buffer piston toward the main shaft. The cam includes a first transmission cam surface and a second transmission cam surface provided at different positions in the first direction, and a first buffer cam surface and a second transmission cam surface provided at different positions in the first direction. The transmission roller has a first transmission follower facing the first transmission cam surface and a second transmission follower facing the second transmission cam surface, and the transmission roller has a first transmission follower facing the first transmission cam surface and a second transmission follower facing the second transmission cam surface. Up to the switching angle, the first transmission cam surface contacts the first transmission follower, the second transmission cam surface does not contact the second transmission follower, and at the transmission switching angle, the first transmission cam surface contacts the first transmission follower. The second transmission cam surface switches from the state in which it contacts the second transmission follower to the state in which it contacts the second transmission follower, and at an opening angle larger than the transmission switching angle, the first transmission cam surface does not contact the first transmission follower, The second transmission cam surface contacts the second transmission follower, and the buffer roller has a first buffer follower facing the first buffer cam surface and a second buffer follower facing the second buffer cam surface, From the state to a predetermined buffer switching angle, the first buffer cam surface contacts the first buffer follower, the second buffer cam surface does not contact the second buffer follower, and at the buffer switching angle, the first buffer cam surface contacts the first buffer follower. switches from a state in which the second buffer cam surface contacts the first buffer follower to a state in which the second buffer cam surface contacts the second buffer follower, and at an opening angle larger than the buffer switching angle, the first buffer cam surface contacts the first buffer follower. does not contact, and the second buffer cam surface contacts the second buffer follower.

According to this configuration, the cam switches from the first transmission cam surface to the second transmission cam surface at the transmission switching angle. Further, at the buffer switching angle, the cam switches from the first buffer cam surface to the second buffer cam surface. Therefore, compared to a single cam configuration, the degree of freedom in designing the cam is increased, the closing force can be increased, and the amount of movement of the buffer piston can be easily increased.

In particular, the first transmission cam surface and the second buffer cam surface are provided at different circumferential positions on the first peripheral surface of the cam, and the second transmission cam surface and the first buffer cam surface are provided on the second peripheral surface of the cam. It is preferable that they be provided at different positions in the circumferential direction. According to this configuration, the cam can be configured easily.

As described above, since the cam is switched during the door opening operation, the degree of freedom in designing the cam increases.

1 shows a closed state of a door closer in an embodiment of the present invention, with (a) being a plan view and (b) being a sectional view taken along line AA in (a). An exploded view showing the main parts of the door closer. (a) and (b) are perspective views showing main parts of the same door closer. FIG. 3 is a plan view showing a cam of the door closer. (a) and (b) are plan views showing a cam of the same door closer. It is a perspective view which shows the main part of the same door closer, Comprising: (a) shows a closed state, (b) shows the state where the opening angle of a door is 45 degrees. FIG. 3 is a perspective view showing the main parts of the door closer, in which (a) shows a state where the door opens at an angle of 80 degrees, and (b) shows a state where the door opens at an angle of 120 degrees. FIG. 2 shows the main parts of the door closer in a closed state, with (a) being a cross-sectional view seen from the top, and (b) being a cross-sectional view seen from the front. Fig. 3 shows a case where the opening angle of the door in the main part of the door closer is 45 degrees, in which (a) is a cross-sectional view seen from a plane, and (b) is a cross-sectional view seen from the front. Fig. 3 shows a case where the opening angle of the door in the main part of the door closer is 80 degrees, in which (a) is a cross-sectional view seen from a plane, and (b) is a cross-sectional view seen from the front. FIG. 2 shows a case where the opening angle of the door in the main part of the door closer is 120 degrees, in which (a) is a cross-sectional view seen from a plane, and (b) is a cross-sectional view seen from the front. A graph showing the relationship between the opening angle of the door and the amount of movement of the slider. A graph showing the relationship between door opening angle and closing force. A graph showing the relationship between the opening angle of the door and the amount of movement of the buffer piston. FIG. 4 is a sectional view of a main part of a door closer according to another embodiment of the present invention. FIG. 4 is a sectional view of a main part of a door closer according to another embodiment of the present invention.

Hereinafter, a door closer according to an embodiment of the present invention will be described with reference to FIGS. 1 to 14. The door closer in this embodiment includes a door closer body 1, a mounting plate 2, and an arm 3, as shown in FIG. The door closer is of a sliding type. Note that hatching is omitted in FIG. 1(b) and the like. The door closer body 1 is attached to a door or a door frame. The door rotates around an axis in the vertical direction. When the door closer body 1 is attached to the door, a rail (not shown) extending in the left-right direction (horizontal direction) is attached to the door frame. The door closer of this embodiment is of a concealed type, and the door closer body 1 is arranged inside the door. A door closer body 1 is screwed to a door via a mounting plate 2. The mounting plate 2 is screwed onto the upper surface of the door closer body 1. Note that the left-right direction is a direction along the surface of the door, and is a radial direction with respect to the rotation center of the door. Further, the front-rear direction is a normal direction to the surface of the door. In this embodiment, the up-down direction is the first direction, and the left-right direction is the second direction.

FIG. 1 shows the door closer when the door is fully closed. The door closer body 1 includes a housing 10, a main shaft 11, a cam 12, a transmission roller 13, a slider 14, a first spring 15 and a second spring 16 as closing springs, a buffer roller 17, and a buffer piston 18. and a third spring 19 as a buffer spring.

The housing 10 as a whole has a rectangular parallelepiped shape that is long in the left-right direction. In FIG. 1, the right side is simply referred to as the right side, and the left side is simply referred to as the left side. In this embodiment, the center of rotation of the door is located on the left side with respect to the door closer body 1, but it may be located on the right side.

The housing 10 has one storage chamber 20 extending in the left-right direction. The housing 10 has openings at both left and right ends, and the left and right openings are each sealed by an end cap 21. The space between the left and right end caps 21 is a storage chamber 20, and the storage chamber 20 is filled with hydraulic oil. A slider 14 , a transmission roller 13 , a first spring 15 , a second spring 16 , a buffer roller 17 , a buffer piston 18 , and a third spring 19 are arranged in the storage chamber 20 . The mounting plate 2 is screwed to the housing 10.

The inner surface of the housing 10 is the wall surface of the storage chamber 20. The wall surface of the storage chamber 20 is a circumferential surface having a circular cross-sectional view except for the vicinity of the main axis 11. The storage chamber 20 has a first center line T1 extending in the left-right direction. In plan view, the main shaft 11, the transmission roller 13, the slider 14, the first spring 15, the second spring 16, the buffer roller 17, and the buffer piston 18 are located on the first center line T1 of the storage chamber 20. , a third spring 19 is arranged. Therefore, the main shaft 11, the transmission roller 13, the slider 14, the first spring 15, the second spring 16, the buffer roller 17, the buffer piston 18, and the third spring 19 are arranged along the left-right direction in a plan view. They are located on the same line. In addition, in a side view or a front view as shown in FIG. They are located on the line (on the first center line T1) and are at the same height in the vertical direction. The transmission roller 13, the slider 14, the first spring 15, and the second spring 16 are arranged on the right side with respect to the main shaft 11, and the buffer roller 17, the buffer piston 18, and the third spring 19 are arranged on the right side with respect to the main shaft 11. It is placed on the opposite side, the left side.

The axial direction of the main shaft 11 is the vertical direction. The main shaft 11 rotates around an axis in the vertical direction. The main shaft 11 is rotatably supported by the housing 10. As shown in FIG. 1, the main shaft 11 is arranged to be biased to the left of the center of the housing 10 in the left-right direction. The main shaft 11 is located approximately at the center of the housing 10 in the front-rear direction, as shown in FIG. 1(a). The upper end of the main shaft 11 projects upward from the housing 10 and also from the mounting plate 2. A first end of the arm 3 is attached to the upper end of the main shaft 11 so as to be non-rotatable. The second end of the arm 3 engages the rail mentioned above. When the door rotates, the second end of the arm 3 slides in the left-right direction while being guided by the rail. The main shaft 11 rotates together with the arm 3 as the door opens and closes.

A first bearing holder 22 and a second bearing holder 23 are attached to the top and bottom parts of the housing 10, respectively. The main shaft 11 is rotatably supported by a first bearing holder 22 and a second bearing holder 23 via bearings, respectively. As shown in FIGS. 2 and 3, the main shaft 11 is composed of upper and lower members that are separate from each other. That is, the main shaft 11 includes a first shaft member 11a located on the upper side and a second shaft member 11b located on the lower side. FIG. 2 is an exploded view of essential parts showing the relationship among the main shaft 11 and the cam 12, the slider 14 and the transmission roller 13, and the buffer piston 18 and the buffer roller 17. Moreover, FIG. 3 is a perspective view showing the main shaft 11, in which (a) shows only the second shaft member 11b, and (b) shows the first shaft member 11a attached to the second shaft member 11b. This shows the state in which the The first shaft member 11a and the second shaft member 11b are vertically and detachably connected to each other. The first shaft member 11a and the second shaft member 11b cannot rotate relative to each other, and rotate as a unit.

The first shaft member 11a is rotatably supported by a first bearing holder 22, and the second shaft member 11b is rotatably supported by a second bearing holder 23. A cam 12 is provided on the second shaft member 11b. Although the cam 12 is provided integrally with the second shaft member 11b, it may be configured as a separate body.

<Cam 12>
The cam 12 has an upper and lower two-stage configuration, and consists of two plate cams arranged one above the other. The cam 12 includes an upper cam 12a located on the upper side and a lower cam 12b located on the lower side. The upper cam 12a and the lower cam 12b rotate together with the main shaft 11 as a unit. The upper cam 12a and the lower cam 12b have mutually different shapes. The upper cam 12a and the lower cam 12b are vertically adjacent to each other. The upper cam 12a is located above the first center line T1, and the lower cam 12b is located below the first center line T1. Although the upper cam 12a and the lower cam 12b are integrally formed, they may be constructed as separate bodies.

4 and 5 show details of the upper cam 12a and the lower cam 12b. FIG. 4 is a plan view showing the shape of the cam surfaces of the upper cam 12a and the lower cam 12b, FIG. 5(a) is a plan view showing the shape of the cam surface of the upper cam 12a, and FIG. ) is a plan view showing the shape of the cam surface of the lower cam 12b. Both FIG. 4 and FIG. 5 show the closed state (0 degree), and the opening direction of the door is counterclockwise as viewed from the paper. An arrow P indicates the direction of rotation of the main shaft 11 and the cam 12 when the door opens. Further, the center line of the main shaft 11 and the center of the cam 12 is indicated by the symbol Q.

The upper cam 12a has a first circumferential surface 30. A second transmission cam surface 31 and a first buffer cam surface 32 are provided on the first circumferential surface 30 . The second transmission cam surface 31 extends from a starting point 31a to an ending point 31b. The first buffer cam surface 32 extends from a starting point 32a to an ending point 32b. The second transmission cam surface 31 and the first buffer cam surface 32 are both located on the left side of the entire circumference of the first circumferential surface 30. The second transmission cam surface 31 and the first buffer cam surface 32 are provided at mutually different positions on the first circumferential surface 30 and spaced apart from each other in the circumferential direction. The second transmission cam surface 31 is located in front of a second center line T2 extending in the left-right direction passing through the center line of the main shaft 11 in a plan view, and extends in the front-rear direction passing through the center line of the main shaft 11. It is located on the left side with respect to the third center line T3. The first buffer cam surface 32 is located on the rear side with respect to the second center line T2 and on the left side with respect to the third center line T3. The second transmission cam surface 31 and the first buffer cam surface 32 are located on opposite sides of the second center line T2 in the front-rear direction.

The lower cam 12b has a second circumferential surface 33. A first transmission cam surface 34 and a second buffer cam surface 35 are provided on the second circumferential surface 33 . The first transmission cam surface 34 extends from a starting point 34a to an ending point 34b. The second buffer cam surface 35 extends from a starting point 35a to an ending point 35b. The first transmission cam surface 34 and the second buffer cam surface 35 are provided at mutually different positions on the second circumferential surface 33 and spaced apart from each other in the circumferential direction. The first transmission cam surface 34 is located on the front side with respect to the second center line T2 and straddles the third center line T3. The second buffer cam surface 35 is located on the rear side with respect to the second center line T2 and straddles the third center line T3. The first transmission cam surface 34 and the second buffer cam surface 35 are located on opposite sides of the second center line T2 in the front-rear direction.

The upper cam 12a and lower cam 12b having such shapes are vertically overlapped as shown in FIG. The first transmission cam surface 34 and the second transmission cam surface 31 are both located on the front side with respect to the second center line T2. The first transmission cam surface 34 and the second transmission cam surface 31 are provided at different positions in the circumferential direction. It is located on the downstream side in the rotational direction of 11. The first buffer cam surface 32 and the second buffer cam surface 35 are both located on the rear side with respect to the second center line T2. The first buffer cam surface 32 and the second buffer cam surface 35 are provided at different positions in the circumferential direction. It is located on the downstream side in the rotational direction of 11. The starting point 34a of the first transmission cam surface 34 is located on the right side, the starting point 32a of the first buffer cam surface 32 is located on the left side, and the starting point 34a of the first transmission cam surface 34 and the starting point of the first buffer cam surface 32 are located on the left side. 32a are both located on the second center line T2 and are 180 degrees opposite each other.

<Transmission roller 13 and slider 14>
The slider 14 has a cylindrical shape whose axis is the first center line T1. The slider 14 contacts the wall surface of the storage chamber 20 (inner surface of the housing 10 ) and is supported by the wall surface of the storage chamber 20 . When the slider 14 moves in the left-right direction, it is guided by the wall surface of the storage chamber 20 and slides on the wall surface of the storage chamber 20. Note that the slider 14 is formed with a through hole (not shown) for communicating hydraulic oil in the left-right direction.

The transmission roller 13 is arranged on the left side of the slider 14. A first support shaft 40 having an axis in the vertical direction is attached to the slider 14. The transmission roller 13 is rotatably supported by the first support shaft 40 via a bearing. The transmission roller 13 rotates in contact with the cam 12. The transmission roller 13 is a cam follower. The transmission roller 13 has a two-stage configuration corresponding to the cam 12, upper and lower. The transmission roller 13 includes an upper transmission roller 13a facing the upper cam 12a and a lower transmission roller 13b facing the lower cam 12b. The upper transmission roller 13a is a second transmission follower, and the lower transmission roller 13b is a first transmission follower. The upper transmission roller 13a and the lower transmission roller 13b are coaxial with each other. The upper transmission roller 13a has a larger diameter than the lower transmission roller 13b. The upper transmission roller 13a and the lower transmission roller 13b are formed integrally with each other, but may be separate bodies from each other. The upper transmission roller 13a and the lower transmission roller 13b are vertically adjacent to each other. The upper transmission roller 13a is located above the first center line T1, and the lower transmission roller 13b is located below the first center line T1. A first cam switching mechanism for generating closing force is configured by the first transmission cam surface 34 of the lower cam 12b, the second transmission cam surface 31 of the upper cam 12a, and the upper transmission roller 13a and the lower transmission roller 13b. .

The transmission roller 13 and the slider 14 move in the left-right direction as a unit. When the door opens, the slider 14 is pushed to the right by the cam 12 and moves, compressing the first spring 15 and the second spring 16. When the door closes, the slider 14 is pushed and moved to the left by the elastic restoring forces of the first spring 15 and the second spring 16, causing the main shaft 11 to generate a closing force for closing the door. A keyway 41 is provided on the outer peripheral surface of the slider 14 along the left-right direction. A regulating pin 42 whose tip protrudes into the housing chamber 20 is attached to the housing 10 . The tip of the regulating pin 42 engages with the keyway 41 . This restricts rotation of the slider 14 about the axis in the left-right direction with respect to the housing 10. That is, the regulation pin 42 functions as a rotation stopper for the slider 14. A locking pin 43 is attached to the right end surface of the slider 14. The end of the locking pin 43 protrudes from the right end surface of the slider 14, and the first spring 15 is locked to the protrusion.

<First spring 15 and second spring 16>
The first spring 15 and the second spring 16 are arranged on the right side of the slider 14. The first spring 15 and the second spring 16 urge the slider 14 to the left side, that is, to the main shaft 11 side. The first spring 15 and the second spring 16 are coil springs and compression springs. The first spring 15 is interposed between the slider 14 and the spring retainer 44. The left end portion of the first spring 15 is in contact with the right end surface of the slider 14. The left end portion of the first spring 15 is locked to a locking pin 43, and rotation of the first spring 15 about the axis in the left-right direction is restricted by the locking pin 43. The spring retainer 44 is located on the right side of the first spring 15. The right end portion of the first spring 15 is in contact with the spring retainer 44 . A locking pin 43 is attached to the left end surface of the spring holder 44. The right end of the first spring 15 is locked to the locking pin 43, and the locking pin 43 restricts the relative rotation of the first spring 15 and the spring presser 44 about the axis in the left and right direction.

The second spring 16 is interposed inside the first spring 15 in the radial direction. The second spring 16 has a smaller diameter than the first spring 15. The second spring 16 is weaker than the first spring 15, and the spring force of the second spring 16 is smaller than the spring force of the first spring 15. The first spring 15 is a main spring, and the second spring 16 is a sub spring. The second spring 16 is also located between the slider 14 and the spring retainer 44.

The spring presser 44 is guided by the wall surface of the storage chamber 20 and is movable in the left-right direction. An adjustment shaft 45 passes through the spring presser 44 in the left-right direction. The adjustment shaft 45 has a male threaded portion and is screwed into a female threaded portion of the spring holder 44 . By rotating the adjustment shaft 45, the spring presser 44 can be moved in the left-right direction. When the spring presser 44 moves to the left, the first spring 15 and the second spring 16 are compressed and the spring force becomes stronger. Conversely, when the spring presser 44 moves to the right, the amount of compression of the first spring 15 and the second spring 16 decreases, and the spring force becomes weaker.

The adjustment shaft 45 passes through the right end cap 21. The adjustment shaft 45 is rotatably supported by the end cap 21. A right end portion of the adjustment shaft 45 protrudes outside the end cap 21, and a first adjustment gear 46 is attached to the right end portion. The first adjustment gear 46 meshes with the second adjustment gear 47. The second adjustment gear 47 is located below the mounting plate 2. An operating shaft 48 is rotatably supported by the mounting plate 2. A second adjustment gear 47 is attached to the lower end of the operating shaft 48. By rotating the operating shaft 48 from above the mounting plate 2, the second adjustment gear 47 can be rotated. By rotating the first adjustment gear 46 via the second adjustment gear 47, the adjustment shaft 45 can be rotated to move the spring presser 44 in the left-right direction. In this embodiment, a spring force adjustment mechanism is configured by the spring presser 44, the adjustment shaft 45, the first adjustment gear 46, the second adjustment gear 47, and the operation shaft 48.

Foamed rubber 49 is accommodated in the accommodation chamber 20 . The foamed rubber 49 is for absorbing expansion due to temperature rise of the hydraulic oil. The foamed rubber 49 is, for example, rod-shaped. The foamed rubber 49 is arranged, for example, inside the second spring 16 in the radial direction.

<Buffer roller 17 and buffer piston 18>
The buffer piston 18 has a cylindrical shape whose axis is the first center line T1. The buffer piston 18 comes into contact with the wall surface of the housing chamber 20 (the inner surface of the housing 10 ) and is supported by the wall surface of the housing chamber 20 . When the buffer piston 18 moves in the left-right direction, it is guided by the wall surface of the storage chamber 20 and slides on the wall surface of the storage chamber 20.

The buffer roller 17 is arranged on the right side of the buffer piston 18. The buffer roller 17 and the buffer piston 18 move together in the left-right direction. A second support shaft 50 having an axis in the vertical direction is attached to the right side of the buffer piston 18. The buffer roller 17 is rotatably supported by the second support shaft 50. The buffer roller 17 rotates in contact with the cam 12. The buffer roller 17 is a cam follower. The buffer roller 17 is located on the opposite side of the transmission roller 13 in the left-right direction with respect to the main shaft 11. The buffer rollers 17 and the transmission rollers 13 face each other in the left-right direction with the main shaft 11 in between.

The buffer roller 17 has a two-stage configuration corresponding to the cam 12, upper and lower. The buffer roller 17 includes an upper buffer roller 17a facing the upper cam 12a and a lower buffer roller 17b facing the lower cam 12b. The upper buffer roller 17a is a first buffer follower, and the lower buffer roller 17b is a second buffer follower. The upper buffer roller 17a and the lower buffer roller 17b are coaxial with each other. The upper buffer roller 17a has a larger diameter than the lower buffer roller 17b. The upper buffer roller 17a has a smaller diameter than the upper transmission roller 13a, and the lower buffer roller 17b has a smaller diameter than the lower transmission roller 13b. The upper buffer roller 17a and the lower buffer roller 17b are formed integrally with each other, but may be separate bodies from each other. The upper buffer roller 17a and the lower buffer roller 17b are vertically adjacent to each other. The upper buffer roller 17a is located above the first center line T1, and the lower buffer roller 17b is located below the first center line T1. The first buffer cam surface 32 of the upper cam 12a and the second buffer cam surface 35 of the lower cam 12b, the upper buffer roller 17a and the lower buffer roller 17b constitute a second cam switching mechanism for controlling the door closing speed. .

The buffer piston 18 partitions the storage chamber 20 into two areas, left and right. The housing 10 is provided with a flow control channel (not shown) for controlling the door closing speed. The buffer piston 18 buffers the door closing operation by forcing hydraulic oil into the flow rate control channel during the door closing operation. The buffer piston 18 includes a buffer head 51 on the left side of the second support shaft 50. The buffer piston 18 has a spring hole 52 that opens on its left end surface. A buffer head 51 is inserted into the spring hole 52 and fixed. A communication hole 53 is formed on the right side of the spring hole 52 and passes through the spring hole 52 and a region of the accommodation chamber 20 on the right side of the buffer piston 18 in the left-right direction.

The third spring 19 is located in the spring hole 52. The third spring 19 is interposed between the buffer head 51 and the left end cap 21. The third spring 19 is a coil spring and a compression spring. The third spring 19 urges the buffer head 51 to the right. The buffer piston 18 is biased to the right by a third spring 19. The third spring 19 is weaker than the first spring 15 and weaker than the second spring 16.

A through hole 54 is formed in the central portion of the buffer head 51 along the left-right direction. The through hole 54 is close to the communication hole 53 and communicates with the communication hole 53. A check valve is provided in the through hole 54. During the door opening operation, the buffer piston 18 moves to the right. During the door opening operation, the ball 55, which is the valve body of the check valve, moves to the left to open the valve, allowing hydraulic oil to pass through the through hole 54. On the other hand, during the door closing operation, the buffer piston 18 moves to the left. During the door closing operation, the ball 55 of the check valve is pushed to the right by the hydraulic pressure of the hydraulic oil, closing the through hole 54, and the hydraulic oil cannot pass through the through hole 54. The hydraulic oil pushed to the left by the buffer piston 18 during the door closing operation is pushed into the flow rate control channel, which is a detour. The hydraulic fluid moves through the flow rate control channel to a region to the right of the buffer piston 18. A regulating valve 56 for controlling the flow rate of hydraulic oil flowing through the flow rate control channel is arranged in the flow rate control channel. The regulating valve 56 can be adjusted from the upper side of the housing 10. By controlling the flow rate of hydraulic oil flowing through the flow rate control channel, the degree of buffering during door closing operation can be adjusted.

A key groove 41 is provided on the outer peripheral surface of the buffer piston 18 along the left-right direction. A regulating pin 42 whose tip protrudes into the housing chamber 20 is attached to the housing 10 . The tip of the regulating pin 42 engages with the keyway 41 . This restricts rotation of the buffer piston 18 about the axis in the left-right direction with respect to the housing 10. That is, the restriction pin 42 functions as a rotation stopper for the buffer piston 18 .

<Door opening operation>
Next, the operation when the door opens from the closed state will be explained in order. FIGS. 6A and 8 show the door closed state. In the closed state, the upper cam 12a is in contact with the upper buffer roller 17a, but not in contact with the upper transmission roller 13a. The first buffer cam surface 32 of the upper cam 12a is in contact with the upper transmission roller 13a. The lower cam 12b is in contact with the lower transmission roller 13b, but is not in contact with the lower buffer roller 17b. The first transmission cam surface 34 of the lower cam 12b is in contact with the lower transmission roller 13b. In the closed door state, the slider 14 is moved to the leftmost side, the first spring 15 and the second spring 16 are in the most expanded state, and the buffer piston 18 is moved to the leftmost side, and the third spring 19 is most compressed. in a state.

When the door is opened, the main shaft 11 rotates together with the arm 3, and together with the main shaft 11, the upper cam 12a and the lower cam 12b rotate. The lower transmission roller 13b is pushed to the right by the first transmission cam surface 34 of the lower cam 12b, thereby causing the slider 14 to slide to the right. The slider 14 pushes and compresses the first spring 15 and the second spring 16. The first transmission cam surface 34 moves the lower transmission roller 13b largely to the right, particularly at the beginning of opening, and greatly compresses the first spring 15 and the second spring 16.

The first buffer cam surface 32 of the upper cam 12a has the longest distance from the center of the cam 12 at its starting point 32a. As the upper cam 12a rotates, the distance from the center of the cam 12 on the first buffer cam surface 32 gradually becomes shorter. As a result, the buffer piston 18 is pushed to the right by the third spring 19 and moves.

<Buffer switching angle>
FIGS. 6(b) and 9 show a state where the opening angle of the door is 45 degrees. In this embodiment, the door opening angle of 45 degrees is the buffer switching angle. In this state, the first transmission cam surface 34 of the lower cam 12b continues to contact the lower transmission roller 13b. The upper cam 12a is not in contact with the upper transmission roller 13a. On the other hand, the first buffer cam surface 32 of the upper cam 12a reaches its end point 32b and finishes contacting with the upper buffer roller 17a. Conversely, the starting point 35a of the second buffer cam surface 35 of the lower cam 12b contacts the lower buffer roller 17b. That is, at the opening angle of 45 degrees, the state of contact between the first buffer cam surface 32 and the upper buffer roller 17a ends, and the state of contact between the second buffer cam surface 35 and the lower buffer roller 17b begins. In this way, at the opening angle of 45 degrees, the cam surface switches from the first buffer cam surface 32 to the second buffer cam surface 35. Therefore, the damping piston 18 can subsequently be moved to the right.

<Transmission switching angle>
FIGS. 7A and 10 show a state where the opening angle of the door (opening angle) is 80 degrees. In this embodiment, the door opening angle of 80 degrees is the transmission switching angle. In this state, the first transmission cam surface 34 of the lower cam 12b reaches its end point 34b and finishes contacting with the lower transmission roller 13b. Conversely, the starting point 31a of the second transmission cam surface 31 of the upper cam 12a contacts the upper transmission roller 13a. That is, at the opening angle of 80 degrees, the state of contact between the first transmission cam surface 34 and the lower transmission roller 13b ends, and the state of contact between the second transmission cam surface 31 and the upper transmission roller 13a begins. In this way, at the opening angle of 80 degrees, the cam surface switches from the first transmission cam surface 34 to the second transmission cam surface 31. Therefore, the slider 14 can continue to move to the right, and the first spring 15 and the second spring 16 can be compressed by the slider 14. On the other hand, the second buffer cam surface 35 of the lower cam 12b continues to contact the lower buffer roller 17b. The upper cam 12a is not in contact with the upper buffer roller 17a.

<Maximum movement angle>
FIG. 7(b) and FIG. 11 show a state where the opening angle of the door is 120 degrees. In this state, the second transmission cam surface 31 of the upper cam 12a continues to contact the upper transmission roller 13a, but the second transmission cam surface 31 reaches near its end point 31b. The lower cam 12b is not in contact with the lower transmission roller 13b. The slider 14 is in a state close to its maximum movement state to the right. On the other hand, the second buffer cam surface 35 of the lower cam 12b continues to contact the lower buffer roller 17b, but the second buffer cam surface 35 reaches near its end point 35b. The upper cam 12a is not in contact with the upper buffer roller 17a. The buffer piston 18 is in a state close to its maximum movement state to the right. After this, even if the opening angle of the door exceeds 120 degrees, the second transmission cam 12 of the upper cam 12a comes into contact with the upper transmission roller 13a, and the second buffer cam surface 35 of the lower cam 12b It comes into contact with the lower buffer roller 17b.

FIG. 12 shows the relationship between the opening angle of the door and the amount of movement of the slider 14. In this graph, the upper line (upper and lower cams) indicates the amount of movement of the slider 14 in this embodiment, and the lower line (single cam) indicates that the cam 12 is composed of one piece. This figure shows the amount of movement of the slider 14 in a configuration that does not have a cam switching mechanism. In this way, the two-stage upper and lower cam can move the slider 14 even at a relatively large opening angle compared to a single cam, and can compress the first spring 15 and the second spring 16. FIG. 13 shows the relationship between the opening angle of the door and the closing force (torque). As can be seen from this graph, the two-stage upper and lower cam has improved closing force at an opening angle of 80 degrees or more, compared to the single cam. Furthermore, in the case of the upper and lower two-stage cam, the peak of the closing force appears near 90 degrees.

Further, FIG. 14 shows the relationship between the opening angle of the door and the amount of movement of the buffer piston 18. In this manner, the configuration of the two-stage upper and lower cams 12 can increase the amount of movement of the buffer piston 18 over the entire region compared to the configuration of a single cam without a cam switching mechanism. Therefore, the flow rate of the hydraulic oil flowing through the flow rate control channel can be increased, and the door closing speed can be easily adjusted.

In this embodiment, the upper transmission roller 13a has a larger diameter than the lower transmission roller 13b, but for example, the upper transmission roller 13a and the lower transmission roller 13b may have the same diameter, or the upper transmission roller 13a may have a larger diameter than the lower transmission roller 13b. The diameter may be smaller than that of the lower transmission roller 13b. As an example, FIG. 15 shows a case where the upper transmission roller 13a and the lower transmission roller 13b have the same diameter. In this case, the upper transmission roller 13a and the lower transmission roller 13b are not coaxial, but have different support axes. That is, the upper support shaft 60 that supports the upper transfer roller 13a is closer to the main shaft 11 than the lower support shaft 61 that supports the lower transfer roller 13b, and the upper transfer roller 13a is closer to the main shaft 11 than the lower transfer roller a13b. The same applies to the upper buffer roller 17a and the lower buffer roller 17b, and the upper buffer roller 17a and the lower buffer roller 17b may have the same diameter, or the upper buffer roller 17a may have a smaller diameter than the lower buffer roller 17b. Good too.

Moreover, although the cam 12, the transmission roller 13, and the buffer roller 17 are arranged in two stages, upper and lower, they may be arranged in three stages, such as upper and lower. For example, as shown in FIG. 16, the cam 12 may have a configuration of three plate cams, a first cam 71, a second cam 72, and a third cam 73 in order from the top. In this case, the first cam 71 and the third cam 73 may have the same shape and may be used in place of the above-mentioned upper cam 12a, and the second cam 72 may be used in place of the above-mentioned lower cam 12b. The transmission roller 13 may be a first transmission roller 81, a second transmission roller 82, and a third transmission roller 83 in order from the top. In this case, the first transmission roller 81 and the third transmission roller 83 may have the same diameter, and may be used in place of the above-mentioned upper transmission roller 13a, and the second transmission roller 82 may be used in place of the above-mentioned lower transmission roller 13b. The buffer rollers 17 may be arranged as a first buffer roller 91, a second buffer roller 92, and a third buffer roller 93 in order from the top. In this case, the first buffer roller 91 and the third buffer roller 93 may have the same diameter and may be used in place of the above-mentioned upper buffer roller 17a, and the second buffer roller 92 may be used in place of the above-mentioned lower buffer roller 17b. In this way, it is also preferable to have a vertically symmetrical configuration.

Although the second transmission cam surface 31 and the first buffer cam surface 32 were provided on the upper cam 12a, the second transmission cam surface 31 and the first buffer cam surface 32 may be provided separately above and below. That is, the second transmission cam surface 31 and the first buffer cam surface 32 may be provided separately on different peripheral surfaces. For example, the second transmission cam surface 31 and the first buffer cam surface 32 may be provided on the first upper cam and the second upper cam, respectively. Similarly, although the first transmission cam surface 34 and the second buffer cam surface 35 were provided on the lower cam 12b, the first transmission cam surface 34 and the second buffer cam surface 35 may be provided separately above and below. . That is, the first transmission cam surface 34 and the second buffer cam surface 35 may be provided separately on different peripheral surfaces. For example, the first lower cam and the second lower cam may be provided with a first transmission cam surface 34 and a second buffer cam surface 35, respectively. Further, the transmission rollers 13 and the buffer rollers 17 may also be provided in multiple stages in the upper and lower directions corresponding to them.

Furthermore, although the cam switching mechanism is provided on the slider 14 side and the buffer piston 18 side, it may be provided only on the slider 14 side or only on the buffer piston 18 side. Further, the buffer piston 18 may be driven by a mechanism other than the cam 12, or the slider 14 may be driven by a mechanism other than the cam 12.

1 Door closer body 2 Mounting plate 3 Arm 10 Housing 11 Main shaft 11a First shaft member 11b Second shaft member 12 Cam 12a Upper cam 12b Lower cam 13 Transmission roller 13a Upper transmission roller (second transmission follower)
13b Lower transmission roller (first transmission follower)
14 Slider 15 First spring (closing spring)
16 Second spring (closing spring)
17 Buffer roller 17a Upper buffer roller (first buffer follower)
17b Lower buffer roller (second buffer follower)
18 Buffer piston 19 Third spring (buffer spring)
20 Accommodation chamber 21 End cap 22 First bearing holder 23 Second bearing holder 30 First peripheral surface 31 Second transmission cam surface 32 First buffer cam surface 33 Second peripheral surface 34 First transmission cam surface 35 Second buffer cam surface 40 First support shaft 41 Keyway 42 Regulation pin 43 Locking pin 44 Spring retainer 45 Adjustment shaft 46 First adjustment gear 47 Second adjustment gear 48 Operation shaft 49 Foamed rubber 50 Second support shaft 51 Buffer head 52 Spring hole 53 Communication Hole 54 Through hole 55 Ball 56 Regulating valve 60 Upper shaft 61 Lower shaft 71 First cam 72 Second cam 73 Third cam 81 First transmission roller 82 Second transmission roller 83 Third transmission roller 91 First buffer roller 92 2nd buffer roller 93 3rd buffer roller T1 1st center line T2 2nd center line T3 3rd stop line

Claims (6)

a main shaft that rotates around an axis in a first direction as the door opens and closes;
A cam provided on the main shaft and rotating together with the main shaft,
a transmission roller that comes into contact with the cam;
a slider that moves in a second direction perpendicular to the first direction together with a transmission roller as the main shaft rotates;
a closing spring that is elastically deformed by a slider when the door opens, restores its shape when the door closes, and applies a closing force to the main shaft via the slider;
Equipped with
The cam has a first transmission cam surface and a second transmission cam surface provided at different positions in the first direction,
The transmission roller has a first transmission follower facing the first transmission cam surface and a second transmission follower facing the second transmission cam surface,
From the closed door state to a predetermined transmission switching angle, the first transmission cam surface contacts the first transmission follower, the second transmission cam surface does not contact the second transmission follower,
At the transmission switching angle, the first transmission cam surface switches from a state in which it contacts the first transmission follower to a state in which the second transmission cam surface contacts the second transmission follower,
A door closer in which the first transmission cam surface does not contact the first transmission follower and the second transmission cam surface contacts the second transmission follower at an opening angle larger than the transmission switching angle. The door closer according to claim 1, wherein the first transmission follower and the second transmission follower are provided coaxially with each other, and the second transmission follower has a larger diameter than the first transmission follower. a main shaft that rotates around an axis in a first direction as the door opens and closes;
A cam provided on the main shaft and rotating together with the main shaft,
A buffer roller that comes into contact with the cam,
a buffer piston that moves in a second direction orthogonal to the first direction together with a buffer roller as the main shaft rotates to buffer the door closing operation;
a buffer spring that biases the buffer piston toward the main shaft;
Equipped with
The cam has a first buffer cam surface and a second buffer cam surface provided at different positions in the first direction,
The buffer roller has a first buffer follower facing the first buffer cam surface and a second buffer follower facing the second buffer cam surface,
From the closed door state to a predetermined buffer switching angle, the first buffer cam surface contacts the first buffer follower, the second buffer cam surface does not contact the second buffer follower,
At the buffer switching angle, the first buffer cam surface switches from a state in which it contacts the first buffer follower to a state in which the second buffer cam surface contacts the second buffer follower,
At an opening angle larger than a buffer switching angle, the first buffer cam surface does not contact the first buffer follower, and the second buffer cam surface contacts the second buffer follower. The door closer according to claim 3, wherein the first buffer follower and the second buffer follower are provided coaxially with each other, and the first buffer follower has a larger diameter than the second buffer follower. a main shaft that rotates around an axis in a first direction as the door opens and closes;
A cam provided on the main shaft and rotating together with the main shaft,
a transmission roller that comes into contact with the cam;
a slider that moves in a second direction perpendicular to the first direction together with a transmission roller as the main shaft rotates;
a closing spring that is elastically deformed by a slider when the door opens, restores its shape when the door closes, and applies a closing force to the main shaft via the slider;
A buffer roller that comes into contact with the cam,
a buffer piston that moves in a second direction together with a buffer roller as the main shaft rotates to buffer the door closing operation;
a buffer spring that biases the buffer piston toward the main shaft;
Equipped with
The cam has a first transmission cam surface and a second transmission cam surface provided at different positions in the first direction, and a first buffer cam surface and a second buffer cam surface provided at different positions in the first direction. has
The transmission roller has a first transmission follower facing the first transmission cam surface and a second transmission follower facing the second transmission cam surface,
From the closed door state to a predetermined transmission switching angle, the first transmission cam surface contacts the first transmission follower, the second transmission cam surface does not contact the second transmission follower,
At the transmission switching angle, the first transmission cam surface switches from a state in which it contacts the first transmission follower to a state in which the second transmission cam surface contacts the second transmission follower,
At an opening angle larger than the transmission switching angle, the first transmission cam surface does not contact the first transmission follower, and the second transmission cam surface contacts the second transmission follower,
The buffer roller has a first buffer follower facing the first buffer cam surface and a second buffer follower facing the second buffer cam surface,
From the closed door state to a predetermined buffer switching angle, the first buffer cam surface contacts the first buffer follower, the second buffer cam surface does not contact the second buffer follower,
At the buffer switching angle, the first buffer cam surface switches from a state in which it contacts the first buffer follower to a state in which the second buffer cam surface contacts the second buffer follower,
At an opening angle larger than a buffer switching angle, the first buffer cam surface does not contact the first buffer follower, and the second buffer cam surface contacts the second buffer follower. The first transmission cam surface and the second buffer cam surface are provided at different positions in the circumferential direction on the first circumferential surface of the cam,
6. The door closer according to claim 5, wherein the second transmission cam surface and the first buffer cam surface are provided at different circumferential positions on the second circumferential surface of the cam.

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