TWI529294B - Door closet - Google Patents

Description

Door closer

The present invention relates to a door closer.

As described in Patent Document 1 below, a door closer having a cam that compresses a main spring for generating a closing force when the door is opened is provided on the main shaft, and is actuated by moving the cushion piston by a cam during the closing operation. The oil is flushed into the flow control flow path to buffer the closing motion. In the configuration of such a cam type, there is an advantage that the moment before the door becomes fully closed is large. However, since the amount of movement of the cushion piston during the door closing operation is small, there is a problem that adjustment of the adjustment valve for controlling the flow rate of the hydraulic oil passing through the flow control flow path is difficult. In addition, since the flow rate of the moving oil by the flow control flow path is small, it is necessary to make the gap of the regulating valve small, but there is a problem that dust is easily clogged in the gap, and the result of dust clogging may occur. The problem of inconsistent speed of closed doors.

[Previous Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Special Fair 5-20547

Accordingly, the present invention has been made in view of the above-mentioned problems, and its object is to provide For a kind of door closing device, the door can be used as a cam type with a large torque before the full closing, and the flow rate of the working oil can be easily adjusted.

The present invention provides a door closer according to the present invention, comprising: a main shaft that rotates in accordance with an opening and closing operation of the door; a main spring that generates a closing force; and a cushioning piston. The hydraulic oil for buffering the closing operation is pressed and flows into the flow control flow path, and the main shaft is provided with a cam and a buffer driving portion, and the cam elastically deforms the main spring when the door is opened. The closing force of the main spring is received during the closing operation, and the buffer driving portion is provided separately from the cam and is used to move the buffer piston in accordance with the opening and closing operation of the door.

In the door closer of this configuration, a cam for elastically deforming the main spring is provided on the main shaft. That is, since the cam type is adopted, a large moment can be generated on the main shaft before the door is fully closed, so that the door can be surely closed to the fully closed state. Therefore, it is effective especially in a room with high airtightness. Further, in the main shaft, since the buffer driving portion for moving the cushion piston is provided separately from the cam, the amount of movement of the cushion piston can be easily and largely set without being restricted by the cam. Therefore, the cushion piston can be largely moved during the closing operation, so that the flow rate of the hydraulic oil passing through the flow control flow path can be increased.

However, the door closer has a link type and a slide type. The link type is a type in which two link arms are interposed between the main shaft and the bracket, and the sliding type is not the two link arms, but only one type of the arm exists. That is, the sliding type door closer is fixed to the main end of the arm so as not to be rotatable relative to the main shaft, and the arm rotates integrally with the main shaft, and the front end portion of the arm is guided by the rail fixed to the door frame, for example, along the track. Slide in the horizontal direction. This sliding type door closer has the advantage of being more aesthetically pleasing than the link type. The invention can be applied to any one of a link type door closer and a sliding type door closer, but in most cases, the sliding type door closer is more than a link type door closer, and is generated before the door becomes fully closed. Big torque, relatively difficult. Therefore, the present invention is particularly suitable for a sliding type door closer, and even if it is a sliding type door closer, it is possible to easily generate a large torque before the door becomes fully closed.

In addition, the main body housing is provided with two chambers, and in one chamber A main spring is disposed, and a cushioning piston is preferably disposed in the chamber on the other side. By providing two chambers, the main spring and the buffer piston can be separately disposed separately. In the configuration described in Patent Document 1, the main spring and the damper piston are disposed in one chamber, and another spring is provided on the side of the damper piston. Therefore, the structure is not complicated, and the main spring and the other spring interfere with each other. As a result, It is difficult to smoothly move the cushion piston by the cam, and in addition, there is a problem that the closing force is liable to become unstable. On the other hand, since the main body is provided with two chambers, and the main spring and the damper piston are separately disposed in the chambers, the action of the main spring and the interference of the operation of the damper piston can be surely prevented, and the closing force can be accurately generated. The working oil can be smoothly flushed into the flow control flow path.

Further, the axial direction of the main shaft is the up and down direction, and the buffer drive unit The upper and lower chambers are disposed in such a manner that the upper and lower positions of the cam are offset, and the upper and lower chambers of the hydraulic oil are formed in the main body casing, and the main chamber is disposed in one of the upper chamber and the lower chamber. Preferably, a buffer piston is disposed in the chamber on the other side. By arranging the cam and the buffer drive unit in the axial direction of the main shaft, that is, in the up-and-down direction, the arrangement of the cam and the buffer drive unit can be facilitated. Further, since the two chambers are the upper chamber and the lower chamber, the front and rear directions of the device can be particularly reduced. The size becomes a closer one.

Further, a pinion gear is provided as a buffer driving portion, and is slow The punching piston is formed with a rack that is threadedly engaged with the pinion gear, and the elastic deformation direction of the main spring is parallel to the moving direction of the buffer piston, and the upper chamber and the lower chamber are arranged above and below, and are arranged with respect to the cam and the cam It is preferable that the side of the main spring is the opposite side and is closer to the door opening side than the portion where the buffer piston moves to the maximum on the door opening side, and the extension portion of the chamber is formed at least on one side. By using the rack and pinion mechanism, the cushion piston can be easily and surely moved, and a wide range of travel stroke can be easily set. Further, since the elastic deformation direction of the main spring and the movement direction of the cushion piston are parallel to each other, and the upper chamber and the lower chamber are arranged up and down, the size of the front and rear directions of the main body casing can be suppressed, and the size of the vertical direction can be suppressed. . Further, the extension portion of the chamber is formed on the side opposite to the side where the main spring is disposed with respect to the cam, or the extension portion of the chamber is formed further forward than the portion where the cushion piston is moved to the door opening side as much as possible. It is also possible to allow the operating oil to enter the extension of these chambers. Thereby, the capacity of the operating oil can be increased, and as a result, deterioration of the operating oil can be suppressed.

In this case, in particular, it is the largest than the buffer piston on the door opening side. a portion of the limit moved closer to the door opening side thereof, and an extension portion of the chamber is formed, and an auxiliary spring is disposed on the extension portion, and the auxiliary spring does not elastically deform at an opening angle of the door at a predetermined angle; It is preferable to generate elastic deformation at an opening angle of a door above a predetermined angle. In the configuration using the cam, the force required to open the door becomes smaller since the start of the door opening operation, and thus has the advantage that the door can be easily opened with a light force. However, conversely, when the door closing action is started from the fully open state, the closing force of the autonomous spring transmitted to the cam is weakened. Therefore, by the extension spring arranging the auxiliary spring that compresses or expands when the door is opened to a predetermined angle or more, the spring can compensate the closing force for starting the closing, and the door closing operation can be surely started. Further, the auxiliary spring may be of a natural length when the door is fully closed, or may be in a state of being compressed or elongated to a predetermined amount.

In addition, the main shaft system is divided into the upper and lower divisions to form the main Among the shaft upper side shaft portion and the lower side shaft portion, a cam is integrally formed on one side, and a pinion gear as a buffer drive portion is integrally formed on the other side, and the cushion piston is formed with Preferably, the pinion produces a threaded rack. By using the rack and pinion mechanism similarly to the above configuration, the cushion piston can be easily and surely moved, and a wide range of movement stroke can be easily set. Further, one of the upper shaft portion and the lower shaft portion is integrally formed by arranging the main shaft into a vertical division and forming a member together with the main shaft so as not to be a member different from the main shaft. The cam is integrally formed with the pinion gear on the other side, and the cam and the pinion gear can be formed with high precision and easily compared with the case where the cam and the pinion gear are configured to be different from the main shaft.

Moreover, the following form is also a preferred form, that is, configured in the upper chamber The main spring is provided with a cushion piston in the lower chamber, and the upper chamber and the lower chamber communicate via the communication hole. In order to absorb the expansion of the operating oil generated when the temperature rise is moderated, a small amount of gas is mixed into the working oil, but the sound is generated when the gas passes through the flow control flow path. Therefore, since the buffer chamber is disposed in the lower chamber, gas is accumulated in the upper chamber, and it is not easy to enter the flow control flow path, so that generation of abnormal noise due to gas can be suppressed.

As described above, in the door closer of the present invention, the buffer driving portion is provided separately from the cam on the main shaft, and the cushioning piston is moved by the buffer driving portion, so that the cushion piston can be largely moved, and the operating oil can be easily performed. The flow rate is adjusted, and since the main spring is elastically deformed by the cam, a large torque can be generated before the door is fully closed.

1‧‧‧Closer body

2‧‧‧ body shell

3‧‧‧ spindle

4‧‧‧ upper room

4a‧‧‧Extension

5‧‧‧The lower room

5a‧‧‧Extension

6‧‧‧ next door

7‧‧‧Connected holes

8‧‧‧ side cover

9‧‧‧Flow control flow path

10‧‧‧buffer piston

10a‧‧‧ Male thread

11‧‧‧Upper cover

12‧‧‧ cam

12a‧‧‧ recess

12b‧‧‧ top

12c‧‧‧Use interval

13‧‧‧ fulcrum

14‧‧‧Roller

15‧‧‧Spring support

16‧‧‧ large diameter coil spring (main spring)

17‧‧‧Circle coil spring (main spring)

18‧‧‧Adjustment axis

19‧‧·Spring force adjustment nut

20‧‧‧Adjustment gear

21‧‧‧Spindle (buffer drive unit)

22, 23‧‧‧ head

24‧‧‧ rack

25‧‧‧ check valve

26‧‧‧Adjustment valve

27‧‧‧Under the cover

30‧‧‧Upper shaft

31‧‧‧lower shaft

32‧‧‧Sawtooth

33‧‧‧ square shaft

40‧‧‧Auxiliary spring

41‧‧‧Spring support

50‧‧‧ Main Department

51‧‧‧Extension

60‧‧‧ main shaft

61‧‧‧Rotating cylinder

61a‧‧‧Female thread part (buffer drive unit)

62‧‧‧ adjustment rod

62a‧‧‧ Tapered

63‧‧‧Adjustment gear

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a longitudinal sectional view showing a door closer according to an embodiment of the present invention.

Figure 2 is a cross-sectional view taken along line A-A of Figure 1.

Fig. 3 is a vertical cross-sectional view showing a state in which the door is opened 180 degrees in the use state of the same door closer.

Fig. 4 is a cross-sectional view corresponding to Fig. 2 showing a state in which the door is opened 180 degrees in the use state of the door closer.

Fig. 5 is a longitudinal sectional view showing a door closer according to another embodiment of the present invention.

Fig. 6 is a longitudinal sectional view showing a door closer according to another embodiment of the present invention.

Fig. 7 is a longitudinal sectional view showing a door closer according to another embodiment of the present invention.

Fig. 8 is a longitudinal sectional view showing a door closer according to another embodiment of the present invention.

Fig. 9 is a cross-sectional view showing the main part of the 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 4 . As shown in FIGS. 1 to 4, the door closer of this embodiment is provided with a door closer body 1. 1 and 2 show the state in which the door is fully closed, and FIGS. 3 and 4 show the state in which the door is fully open. Further, FIGS. 5 to 9 which will be described later all show a fully closed state.

The door closer body 1 includes: a body casing 2; and a main shaft 3 whose shaft is supported by the body casing 2 and rotates about an axis of the up and down direction. A base end portion of an arm (not shown) is attached to the main shaft 3 so as not to be rotatable relative thereto. The door closer body 1 is attached to a door that rotates about an axis in the up and down direction or is mounted on a door frame. For example, when mounted on a door, a rail (not shown) extending horizontally is attached to the door frame, and the front end of the arm is attached. The department is attached to the orbit. If the door rotates, the arm and the spindle 3 are integrally coupled to the opening and closing action. Rotating, the front end of the arm slides horizontally while being guided by the rail.

The main body casing 2 has a horizontally long rectangular parallelepiped shape in which the entire direction is long in the horizontal direction (lateral direction), but has a long dimension in the vertical direction (longitudinal direction) with respect to the dimension in the front-rear direction (the direction inside the paper surface). In addition, in FIG. 1, the one side of the right side is the one side of the horizontal direction, and the left side is the side of the other side of the horizontal direction. In the following description, it is simply called the right side and the left side. Further, the center of rotation of the door is located on the left side with respect to the door closer body 1.

The body casing 2 is formed with two chambers extending laterally above and below. The upper chamber 4 and the lower chamber 5 are formed to be arranged one above another, and the axial direction thereof is lateral and parallel to each other, and any of the chambers is filled with a working oil. The upper chamber 4 and the lower chamber 5 are separated by a partition wall 6 located therebetween to form separate chambers. However, the partition wall 6 is formed with a through hole 7 through which the upper chamber is formed. 4 is in communication with the lower chamber 5. Further, the lower chamber 5 has a length close to the lateral full length of the body casing 2, and on the other hand, the upper chamber 4 is shorter than the lower chamber 5. The lower chamber 5 is formed by forming a through hole penetrating in the lateral direction of the main body casing 2, and closing the opening portions at both ends of the through hole by the side cover 8, respectively. On the other hand, the upper chamber 4 is formed to be biased to the right side with respect to the lower chamber 5. That is, the upper chamber 4 is formed by the body casing 2 forming a non-penetrating transverse hole having only the right end opening, and the side cover 8 closing the right end opening. Further, a main spring that generates a closing force for closing the door is housed in the upper chamber 4, and a buffer piston 10 that is used to flush the moving oil for buffering the closing operation into the flow control flow path 9 is housed in the lower chamber 5.

The main shaft 3 is disposed to penetrate the upper chamber 4 and the lower chamber 5 at the same time. The main shaft 3 is disposed closer to the left side than the lateral center of the main body casing 2, and is located near the end portion on the left side of the upper chamber 4. That is, since the main shaft 3 is disposed to be biased toward the center of rotation of the door, the size of the main shaft 3 to the left end of the door closer main body 1 is The size of the spindle 3 to the right end of the door closer body 1 is long. The main shaft 3 is rotatably supported by the upper cover 11 and the lower cover 27 attached to the upper and lower surfaces of the main body casing 2 via bearings, and is also rotatably supported by the partition wall 6 via bearings. The lower end portion of the main shaft 3 does not protrude from the lower cover 27, and the upper end portion of the main shaft 3 protrudes from the upper cover 11 by a predetermined length upward, and the upper portion of the main shaft 3 is not rotatably attached to the upper portion. The base end of the above arm.

A heart-shaped cam 12 is disposed above the main shaft 3. The cam 12 and The main shaft 3 is not a member of a different member but is formed integrally with the main shaft to constitute one member. The cam 12 is located at a height corresponding to the upper chamber 4, and is configured to compress the main spring during the door opening operation, and the closing force of the self-spring by the elastic restoring force during the door closing operation. The cam 12 has a circumferential surface as a cam surface of the cam surface, and only a predetermined angle region in the entire circumference is used as a section for opening and closing operations of the door, and an angle region from one side of the concave portion 12a to the top portion 12b is a use section 12c. .

Abutting on the cam 12 with the support shaft 13 supported in the up and down direction It is the roller 14 of the cam follower. The support shaft 13 of the roller 14 is attached to a spring support 15 which is movable in the axial direction of the upper chamber 4, that is, in the upper chamber 4, and the spring support 15 is pressed against the main spring on the right side thereof during the door opening operation. And make it compressed. Further, the spring support 15 is formed with a through hole penetrating in the lateral direction, and the working oil can pass through the through hole.

The main spring system comprises two coil springs 16, 17 of a size. Big diameter line The coil spring 16 and the coil spring 17 having a small diameter are arranged coaxially with each other. That is, a coil spring 17 having a small diameter is inserted inside the coil spring 16 of the large diameter. Further, an adjustment shaft 18 is horizontally penetrated in the center of the side cover 8 of the upper chamber 4, and a predetermined length is projected in the upper chamber 4, and a male screw portion is formed in the protruding portion. Spring force adjustment nut 19 is threaded The male thread portion of the adjustment shaft 18 is engaged. The adjustment shaft 18 is rotatably supported by the side cover 8 about its axis, and the adjustment gear 20 is attached to the end (outer end portion) of the right side of the adjustment shaft 18 which slightly protrudes toward the outer side of the body casing 2. By rotating the adjustment gear 20 by an adjuster (not shown), the adjustment shaft 18 can be rotated to laterally move the spring force adjustment nut 19. A coil spring 16 having a large diameter is interposed between the spring force adjusting nut 19 and the spring support 15, so that the spring force can be adjusted. On the other hand, the coil spring 17 of the small diameter is interposed between the spring support body 15 and the end portion (the inner end portion) of the left side of the adjustment shaft 18, so that the spring force is not adjustable.

As shown in Figure 2, when fully closed, the roller 14 is engaged in the cam. The state of the recess 12a of 12, as the door is gradually opened from this state, the cam 12 rotates clockwise in Fig. 2. In the clockwise rotation from the concave portion 12a to the top portion 12b of the cam 12, the angle is more than 180 degrees, and the angle is about 225 degrees as an example. As shown in FIG. 4, even when the door is opened to a maximum of 180 degrees, The roller 14 also does not reach the top 12b of the cam 12. In this manner, the cam 12 has an asymmetrical shape, that is, the use section 12c used in the opening and closing operation of the door in the entire circumference is longer than the remaining circumference, that is, the unused area.

A pinion 21 is integrally formed at a lower portion of the main shaft 3. The pinion gear 21 is also formed as a single member, which is not a separate member from the main shaft 3 but is integrally formed with the main shaft 3. The pinion gear 21 is located at a height below the predetermined height of the cam 12 and corresponding to the lower chamber 5, and constitutes a buffer drive portion for laterally moving the cushion piston 10 in accordance with the opening and closing operation of the door. The buffer piston 10 has a head portion 22, 23 that slides with the wall surface of the lower chamber 5 at both ends thereof, and a rack 24 is formed between the head portions 22, 23, and the pinion gear 21 of the main shaft 3 is threadedly coupled thereto. Rack 24. The two head portions 22 and 23 are respectively formed with through holes at the center portion, and are disposed at the through holes of the head portion 22 on the left side. There is a check valve 25. At the time of the door opening operation, the cushion piston 10 moves to the right side. However, at this time, the valve body of the check valve 25, that is, the ball body moves to the left side to open the valve, and the hydraulic oil can flow through the through hole. On the other hand, at the time of the door closing operation, the cushion piston 10 moves to the left side. Therefore, the ball of the check valve 25 is pressed toward the right side by the hydraulic pressure to close the through hole, so that the operating oil cannot flow through the through hole. . At the time of the door closing operation, the damping piston 10 is pressed against the left side of the actuating oil, and is flushed into the flow rate control flow path 9 which is the 迂 return path, and the flow control flow path 9 is further to the right side than the head portion 22 on the left side. The area moves. A regulating valve 26 for controlling the flow rate of the operating oil flowing through the flow control flow path 9 is disposed in the flow control flow path 9. The adjustment valve 26 is provided in plural, specifically three.

In this embodiment, the door body 1 is disposed inside the door. The case of the concealed type door closer is described as an example. Therefore, the plurality of adjustment valves 26 are disposed on the upper surface of the main body casing 2 and can be adjusted from above. The buffer piston 10 is disposed in the lower chamber 5, and thus the flow control flow path 9 is formed from the wall surface of the lower chamber 5 to the vicinity of the upper surface of the body casing 2. The upper chamber 4 is not formed in the body casing 2 on the left side of the cam 12. A flow control flow path 9 is formed in a left portion of the upper portion of the body casing 2 where the upper chamber 4 is not formed. That is, with the main shaft 3 as the center, the main spring is disposed on the right side, and the flow control flow path 9 is formed on the opposite side, that is, the left side.

Further, in the case of using the door closer of the embodiment, the door can be opened up to a maximum of 180 degrees, and FIGS. 3 and 4 show that the 180 degree is fully opened. In the fully open state of the door, the cushion piston 10 is in a state of being moved to the right to the maximum extent. In this state, the cushion piston 10 does not abut against the side cover 8 on the right side of the lower chamber 5, and the two are separated. In other words, the lower chamber 5 is formed to be longer than the portion on the right side (opening side) of the buffer piston 10 that is moved toward the door opening side, that is, the right side, to a predetermined extent. This margin is also the buffer piston 10 and right in Figures 3 and 4. The portion between the side cover 8 is the extension 5a of the lower chamber 5. Further, the length of the extension portion 5a is longer than the stroke of the cushion piston 10 and has a length several times or so.

Moreover, as the door opens and closes, the spindle 3 rotates, thereby rotating thereby The spring support 15 moves together with the cushion piston 10, but the amount of movement of the cushion piston 10 is large. Further, as shown in FIGS. 3 and 4, in a state where the spring support body 15 and the cushion piston 10 are moved to the right side as far as possible, the end surface on the right side of the spring support body 15 and the end surface on the right side of the cushion piston 10 are substantially the same in the lateral direction. s position. Further, the communication hole 7 is formed on the right side from the position so as not to be closed by the spring support 15 and the cushion piston 10.

In addition, the main shaft 3 is such that the upper and lower shaft portions are in the vertical direction The structure is divided into two structures. In other words, the main shaft 3 includes the upper shaft portion 30 and the lower shaft portion 31, and the lower end portion of the upper shaft portion 30 and the upper end portion of the lower shaft portion 31 are coupled to each other so as not to be rotatable relative to each other. This connection structure has various structures, and in this embodiment, it is connected by the serrations 32 of the up-down direction. A cam 12 is integrally formed on the upper shaft portion 30, and a pinion gear 21 is integrally formed on the lower shaft portion 31. Further, the upper shaft portion 30 is inserted from the upper surface of the main body casing 2, and the lower shaft portion 31 is inserted from the lower surface of the main body casing 2, and is connected to each other at the position of the partition wall 6 by serrations 32. As described above, the main shaft 3 is divided into two structures, and the cam 12 and the pinion gear 21 can be easily formed into the main shaft 3 as a single member without being configured as a separate member. Further, the upper shaft portion 30 and the lower shaft portion 31 can be inserted from the upper surface and the lower surface of the main body casing 2, respectively, so that assembly can be easily performed.

In the door closer configured as described above, the main spring is pressed by the cam 12 Shrinking, so that after the door is opened at a predetermined angle, it can be easily opened to a fully open state of, for example, 180 degrees with a light force. In addition, before the door becomes fully closed, the cam 12 can be used on the main axis. 3 produces a large moment in the direction of the door closing, thus reliably closing the door to the fully closed state. Therefore, it is particularly suitable for use in a room with high airtightness, and the like, and is particularly effective for a sliding type door closer.

Moreover, it is formed separately from the cam 12 on the main shaft 3 to be additionally formed. Since the cushion piston 10 moves as the pinion gear 21 of the buffer drive portion, the buffer piston 10 can be easily moved largely without being restricted by the cam 12. Therefore, the cushion piston 10 can be largely moved during the closing operation, and a sufficient amount of the moving oil can be flushed into the flow control flow path 9, so that the flow rate adjustment of the operating oil can be easily performed by the regulating valve 26.

In addition, the cam 12 and the pinion are arranged due to the misalignment of the upper and lower positions. 21, so that interference between the two can be easily prevented, and the configuration can be easily performed. Further, by arranging the upper chamber 4 and the lower chamber 5 in parallel in the upper and lower directions, the size of the door closer body 1 in the front-rear direction can be reduced, and thus it is particularly suitable for a concealed type disposed inside the door.

Further, the main spring and the buffering chamber are disposed in the upper chamber 4 and the lower chamber 5, respectively. The plug 10 can easily prevent the action of the main spring from interfering with the action of the cushion piston 10, and the closing force can be correctly generated in accordance with the design of the cam 12, so that the operating oil can be smoothly flushed into the flow control flow path 9. Further, a main spring is disposed in the upper chamber 4, and thus the mechanism for adjusting the spring force is also located above the main body casing 2 together with the adjustment valve 26, so that the spring force and the flow rate of the hydraulic oil can be easily performed from above. Adjustments are made to make it easy to perform concealed adjustments.

Further, an extension portion 5a is formed on the right side of the lower chamber 5, so that it can be increased It is equivalent to the amount of oil used in this part, so that the deterioration of the working oil can be suppressed. In particular, since the upper chamber 4 and the lower chamber 5 are connected by the communication hole 7, even if the chamber is disposed independently of the upper and lower sides, the entire working oil can have a larger capacity as compared with the upper chamber 4 and lower. The compartments 5 are not connected to each other, and not only the oil is stabilized but also the brakes are stabilized.

In addition, in order to absorb the swelling of the moving oil caused by the moderate temperature rise Swelling will mix gas into the hydraulic fluid. Although the gas is accumulated in the upper chamber 4, since the main spring is disposed in the upper chamber 4 and the buffer piston 10 is disposed in the lower chamber 5, the gas does not easily enter the flow control flow path 9, thereby suppressing the flow of the gas through the flow control passage. The abnormal sound produced at 9 o'clock.

Further, in the present embodiment, the main spring is disposed in the upper chamber 4, and The chamber 5 is provided with a cushion piston 10, but may be arranged in the opposite direction. That is, as shown in Fig. 5, the cushion piston 10 may be disposed in the upper chamber 4, and the main spring (the coil spring 16 having a large diameter and the coil spring 17 having a small diameter) may be disposed in the lower chamber 5, and the pinion gear 21 may be formed in the upper shaft portion 30. A cam 12 is formed on the lower shaft portion 31. Further, in the aspect shown in FIG. 5, since the lower cover 27 is not provided, the upper shaft portion 30 and the lower shaft portion 31 are inserted from the upper surface of the body casing 2. In this embodiment, the square shaft portion 33 is used for the connection between the upper shaft portion 30 and the lower shaft portion 31. Further, on the right side of the upper chamber 4, an extension portion 4a is provided similarly to the extension portion 5a of the lower chamber 5 of Fig. 1. Further, in the lower chamber 5, an extension portion 5a is also provided on the left side thereof. That is, the extension portion 5a is formed on the left side of the lower chamber 5, that is, on the side opposite to the side on which the main spring is disposed on the cam 12. Therefore, the upper chamber 4 and the lower chamber 5 are configured to have substantially the same lateral length. In this way, since the extension portions 4a and 5a are provided in the upper chamber 4 and the lower chamber 5, the actuation oil can be filled in a larger amount, and the deterioration of the actuation oil can be prevented to have higher efficiency. Moreover, in this case, since the cushion piston 10 is disposed in the upper chamber 4, the flow rate control flow path 9 formed to extend upward from the upper chamber 4 is shortened as compared with the case of FIG.

In addition, an auxiliary bomb can also be arranged on the right side of the cushion piston 10 as shown in FIG. Spring 40. That is, the spring support body 41 is disposed on the extension portion 4a of the upper chamber 4, and An auxiliary spring 40 is disposed between the spring support 41 and the right side cover 8. The spring support body 41 is formed to have a larger diameter (larger) than the head portion 23 on the right side of the cushion piston 10, and the wall surface of the upper chamber 4 is also formed to have a large diameter of a predetermined length, and the large diameter portion of the predetermined length is slidably A spring support body 41 is provided. 6 is a view showing the door in a fully closed state. However, in the fully closed state, the spring support body 41 is pressed by the auxiliary spring 40 to be located at the leftmost position, that is, close to the cushioning piston 10, but the spring support body 41 abuts the upper portion. The stepped portion of the wall surface of the chamber 4 is no longer movable to the left side, and is not in contact with the cushion piston 10 and is located at a position separated from the cushioning piston 10 by a predetermined distance toward the right side. Next, when the door is opened at a predetermined angle, the cushion piston 10 abuts against the spring support 41, and the cushion piston 10 presses the assist spring 40 via the spring support 41 to compress it at an opening angle exceeding the door. That is, the auxiliary spring 40 first starts compression deformation from the initial state (normal state) when the door is opened beyond a predetermined angle, and is not pressed by the cushion piston 10 at an opening angle less than the predetermined angle, and is in an initial state. Does not compress deformation. Further, the initial state of the auxiliary spring 40 may be a natural length, but it is preferably a predetermined amount to be compressed. In addition, the opening angle of the door at the start of compression can be arbitrarily set, for example, it can be set to 100 degrees. In the configuration using the cam 12, in order to reduce the force required to gradually open after the start of the door opening operation, there is an advantage that the door can be easily opened with a light force, and conversely, the door is closed from the fully open state. When operating, the self-spring is transmitted to the cam 12 with a weak closing force. Therefore, as described above, by arranging the assist spring 40, in particular, the assist spring 40 can be used to complement the closing force that is closed from the fully open state, so that the door closing operation can be surely started. The above-described auxiliary spring 40 is also applicable to the configuration shown in FIG. In the case of FIG. 1, the cushion piston 10 is disposed in the lower chamber 5, so that the auxiliary spring 40 may be provided in the extension portion 5a1 of the lower chamber 5. In any case, as long as the extension is provided in the chamber in which the cushion piston 10 is disposed, and the extension is provided The auxiliary spring 40 can be placed.

In addition, the buffer piston may be disposed in the opposite direction to the above configuration. 10. For example, in FIG. 7, the cushion piston 10 is disposed in the upper chamber 4, but the cushion piston 10 moves to the left side during the door opening operation and moves to the right side during the door closing operation. The check valve 25 is provided on the right head portion 23. Further, in the embodiment of Fig. 7, the right head portion 23 is composed of a main portion 50 and an extending portion 51 integrally coupled to the right side of the main portion 50, and a check valve 25 is provided at an end portion on the right side of the extending portion 51. . Further, the flow control flow path 9 is also provided on the right side of the main body casing 2. By arranging the flow control flow path 9 on the right side, that is, away from the center of rotation of the door, the size of the door closer body 1 on the left side of the main shaft 3, that is, on the side closer to the rotation center of the door can be shortened. The spindle 3 is brought close to the center of rotation of the door. Alternatively, the main shaft 3 may be located at the center of rotation of the door, or the main shaft 3 itself may be used as the main shaft 3. Moreover, in the form of FIG. 7, the extension part 5a is provided in the left side of the lower chamber 5.

Further, in the above embodiment, the cam 12 and the pinion 21 are respectively The main shaft 3 is integrally formed, but the cam 12 or the pinion 21 may be used as a member different from the main shaft 3 and assembled on the main shaft 3.

Further, in the above embodiment, the pinion gear 21 is formed on the main shaft 3, The damper piston 10 is formed in the damper piston 10. However, the damper drive unit for moving the damper piston 10 in accordance with the opening and closing operation of the door is not limited to the rack and pinion mechanism, and various mechanisms may be employed. The damper piston 10 is formed with a threaded portion and is screwed into the threaded portion of the main shaft 3, and the screw transmission mechanism is used as a damper driving portion to move the damper piston 10 in the axial direction of the main shaft 3 in association with the rotation of the main shaft 3. For example, as shown in FIG. 8, the body casing 2 is formed with a horizontally long upper chamber 4 in which the autonomous shaft 3 extends laterally, and a vertically long lower chamber 5 extending downward in the axial direction of the main shaft 3, and the body casing 2 is formed as L Word shape. A cam 12 is formed on the upper portion of the main shaft 3, and a coil spring 16 having a large diameter as a main spring and a coil spring 17 having a small diameter are disposed in the upper chamber 4 at a position corresponding thereto, and the cushion piston 10 is disposed in the lower chamber 5.

In detail, the upper shaft portion 30 is connected in the axial direction via the serrations 32. The lower side shaft portion 31 includes a shaft main portion 60 having serrations 32 and a cylindrical rotating cylinder 61 whose upper end portion is fixed to the shaft main portion 60 and extends downward. A female screw portion 61a is formed on the inner circumferential surface of the rotary cylinder 61, and the male screw portion 10a of the predetermined region on the outer circumferential surface of the cushion piston 10 is screwed to the female screw portion 61a, and is rotated by the main shaft 3, that is, the rotary cylinder 61. Rotating, the cushion piston 10 moves up and down on the inner side of the rotating cylinder 61. A check valve 25 is provided on the upper portion of the cushion piston 10, and the cushion piston 10 is lowered during the door opening operation, and rises during the door closing operation to flush the operating oil into the flow control flow path 9. The adjustment lever 62 penetrates the center of the upper portion of the cushion piston 10 upward. Since the adjustment lever 62 is independent of the main shaft 3, even if the main shaft 3 rotates, it does not rotate with this. The adjustment lever 62 is screwed into the lower cover 27, and its lower end portion projects downward from the main body casing 2, and an adjustment gear 63 is fixed thereto. When the adjustment lever 62 is rotated by coupling a tool (not shown) to the adjustment gear 63, the amount of screwing of the lower cover 27 can be changed, and the adjustment lever 62 can be moved up and down. The predetermined area on the upper side of the adjustment lever 62 is tapered toward the lower side into a tapered shape, and the tapered portion 62a is inserted through the through hole in the upper portion of the cushion piston 10. A small gap is formed between the through hole in the upper portion of the cushion piston 10 and the adjustment rod 62. When the adjustment rod 62 is raised, the gap is widened, and if it is lowered, the gap is narrowed. This gap constitutes the flow control flow path 9, and the adjustment lever 62 functions as a regulating valve. When the closing operation is performed, the damping piston 10 rises, and the hydraulic oil moves downward through the gap between the upper through hole and the adjustment rod 62. In this way, since the main body casing 2 is provided with two chambers, and the main spring is disposed in one chamber, the buffer piston 10 is disposed in the other chamber. The mutual interference of the compression action of the main spring and the movement action of the cushion piston 10 can be easily prevented.

Moreover, the cam 12 may not have an asymmetrical shape as described above, but may In the symmetrical shape, that is, as shown in FIG. 9, the use section 12c used in the opening and closing operation in the entire circumference is equal to the circumference of the unused section which is not used. In Fig. 9, the recess 12a, the center of the cam 12, and the top portion 12b are in a straight line.

In addition, in the case where the buffer piston 10 forms the rack 24, There is a so-called built-in stopper, that is, a stopper mechanism for holding the door at a predetermined opening angle state is provided in the rack 24.

In addition, the so-called concealment of the door body 1 is configured inside the door. The case of the type of door closer has been described as an example, but it is of course also applicable to a door closer in which the door closer body 1 is provided outside the door.

In addition, the door closer body 1 can also be configured by the door, and the main The shaft 3 is not fixed to the door frame in a relatively rotatable manner, or conversely, the door closer body 1 is disposed on the door frame, and the spindle 3 is fixed to the door in a rotationally fixed manner, and the spindle 3 is used as a center of rotation of the door.

1‧‧‧Closer body

2‧‧‧ body shell

3‧‧‧ spindle

4‧‧‧ upper room

5‧‧‧The lower room

5a‧‧‧Extension

6‧‧‧ next door

7‧‧‧Connected holes

8‧‧‧ side cover

9‧‧‧Flow control flow path

10‧‧‧buffer piston

11‧‧‧Upper cover

12‧‧‧ cam

13‧‧‧ fulcrum

14‧‧‧Roller

15‧‧‧Spring support

16‧‧‧ large diameter coil spring (main spring)

17‧‧‧Circle coil spring (main spring)

18‧‧‧Adjustment axis

19‧‧·Spring force adjustment nut

20‧‧‧Adjustment gear

21‧‧‧Spindle (buffer drive unit)

22, 23‧‧‧ head

24‧‧‧ rack

25‧‧‧ check valve

26‧‧‧Adjustment valve

27‧‧‧Under the cover

30‧‧‧Upper shaft

31‧‧‧lower shaft

32‧‧‧Sawtooth

Claims (7)

A door closer characterized by comprising: a main shaft that rotates in conjunction with opening and closing operations of the door; a main spring for generating a closing force; and a damping piston for actuating the oil for buffering the closing operation Pressing and flowing to the flow control flow path; and providing a cam on the main shaft and a buffer drive unit provided separately from the cam, the cam is elastically deformed during the door opening operation and is closed during the door closing operation The buffer drive unit is configured to move the buffer piston in accordance with the opening and closing operation of the door, and the pinion drive unit is provided with a pinion gear, and the buffer piston is formed with a tooth that is threadedly engaged with the pinion gear. article. A door closer according to claim 1, wherein the door closer is a slide type door closer configured to slide a front end portion of the arm that rotates integrally with the main shaft by a rail. A door closer according to claim 1 or 2, wherein the main body casing is provided with two chambers, and a main spring is disposed in one of the chambers, and a buffer piston is disposed in the other chamber. The door closer according to claim 3, wherein the pinion gear has an axial direction of the main shaft in an up-and-down direction, and is disposed in a manner of being vertically offset from the cam, and the upper casing is formed with a working oil upper chamber. And a lower chamber, wherein a main spring is disposed in one of the upper chamber and the lower chamber, and a buffer piston is disposed in the other chamber. For example, in the door closer of claim 4, wherein the elastic deformation direction of the main spring is parallel to the moving direction of the buffer piston, and the upper chamber and the lower chamber are arranged above and below, An extension portion of the chamber is formed on at least one side of the side opposite to the side on which the main spring is disposed with respect to the cam and the portion where the buffer piston is moved to the maximum side of the door opening. The door closer according to claim 5, wherein an extension portion of the chamber is formed closer to the door opening side than a portion of the buffer piston that is moved to the side of the door to the maximum extent, and an auxiliary spring is disposed at the extension portion. The auxiliary spring does not elastically deform when the opening angle of the door is less than a predetermined angle, and elastically deforms when the opening angle of the door is equal to or greater than a predetermined angle. The door closer according to the fourth aspect of the invention, wherein the main shaft is divided into the upper and lower sides, and a cam is integrally formed on one side of the main shaft upper side shaft portion and the lower side shaft portion, and the other is integrally formed. A pinion is integrally formed on one side.