JP3281540B2 - Pivot type door closer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pivot type door closer, and more particularly, to a so-called lifting type pivot type door closer in which a pivot axis of a door is displaced from a door body.

[0002]

2. Description of the Related Art A lift-out type pivot type door closer disclosed in Japanese Utility Model Publication No. 7-1483 discloses a piston case provided above a door body and having a piston reciprocating therein. It has a gear case fixedly supported by an upper frame surrounding the door body and provided on the piston case. A circular hole extending in the horizontal direction is formed in the piston case, and the piston is slidably provided in the circular hole. The gear case is positioned so as to protrude from the door body in the direction of rotation of the door, and a pivot shaft forming a rotation axis of the door body is supported by the upper frame portion and protrudes downward from the upper frame portion into the gear case. Is housed.

An eccentric pivot gear fixed to a pivot shaft, an idle gear meshing with the eccentric pivot gear, and an eccentric pinion gear meshing with the idle gear are provided in the gear case. The pinion shaft extends downward from the eccentric pinion gear. It is stored in the piston case. A rack is formed in the piston, and a pinion gear that meshes with the rack is fixed to the pinion shaft. Further, one end surface of the piston is urged by a compression spring for urging the door body in the door closing direction.

When the door body is opened and closed, the rotation is transmitted in the order of an eccentric pinion gear, an idle gear, and an eccentric pivot gear, and the door body rotates about the axis of the pivot shaft. When the door body is opened, the eccentric pinion gear rotates in the piston case, and the piston moves through the rack in a direction to compress the compression spring in the circular hole against the urging force of the compression spring. Therefore, the returning force of the door body in the closing direction is accumulated by the opening operation of the door body, and the closing operation is performed by the returning force of the compression spring. Also, hydraulic pressure acts on the circular hole and the piston, and the return force of the compression spring is adjusted.

[0005] The idle gear is located between the eccentric pinion gear and the eccentric pivot gear, and the idle gear shaft is configured so as to be able to translate in the elongated hole in order to absorb the eccentric amount of the eccentric pinion gear and the eccentric pivot gear. Here, the long hole is formed parallel to a line connecting the pivot shaft and the pinion shaft, and the idle gear shaft rotates while moving along the long hole according to the rotation of the eccentric pinion gear or the eccentric pivot gear. is there. That is, as the door body opens and closes, the idle gear rotates and moves linearly.

[0006]

However, according to such a configuration, the idle gear needs to perform not only a rotational movement but also a linear movement, which causes a reduction in torque transmission efficiency. In addition, the idle gear shaft is not urged in the long hole direction by the urging force of the compression spring, but performs linear motion while being urged in a direction perpendicular to the long hole, so that friction occurs between the long hole and the idle gear shaft. There is a possibility that the gears will be worn, and as a result, the gears will rattle and the transmission efficiency will be further reduced.

Further, since an eccentric pivot gear and an eccentric pinion gear are used, it is generally difficult to manufacture the gear. Further, since the gear portion (transmission portion) is configured to increase the torque at the time of closing the door, if the installation angle is incorrect, the desired torque cannot be obtained. Therefore, it is necessary to accurately determine the angle at which the gears are assembled at the time of assembly, and there is a problem in terms of assemblability.

Further, the door body cannot be held in an open state, and when the door closer is attached to the door body, it is necessary to provide a stop device for holding the door separately from the door body.

Accordingly, the present invention does not require linear motion of an eccentric gear or a specific gear shaft to increase the door closing torque, and does not cause rattling due to wear of the gear shaft in the gear portion, and the transmission efficiency from the gear to the piston. It is easy to manufacture gears using standard gears without using eccentric gears, which are difficult to manufacture, and it can be opened with the same opening force as a normal door closer from a specific opening angle. Further, it is an object of the present invention to provide a take-out and suspension type pivot-type door closer capable of keeping the door open and capable of gradually increasing the closing torque and closing the door with a large closing force when the door is closed.

[0010]

In order to achieve the above object, the present invention provides a gear case located on an upper part of a door body,
A pivot shaft extending from a mounting frame surrounding the door body and constituting a pivot axis of the door body, one end of which is housed in the gear case; and a gear housed in the gear case and connected to the pivot shaft. A row, a piston case provided on the door body, a piston provided reciprocally in the piston case and formed with a rack, and a gear train for connecting the gear train and the piston. A pinion shaft that is connected and extends from the gear case into the piston case, a pinion that meshes with the rack and is provided on the pinion shaft, and is provided in the piston case for urging the door body in the closing direction. In a lift-out type pivot type door closer having a spring for biasing one end of the piston, a piston case 12, 38, 39 at one end of the piston 30 is provided. The piston 30 in the space 40
The piston case is provided with a ball engaging portion 39a.
A ball holding member 41 is movably provided at a position facing the ball locking portion 39a.
The ball 42 is always accommodated therein, and an auxiliary spring 49 is provided between the piston 30 and the ball holding member 41. The ball locking portion 39a holds the ball 42 within a range where the piston 30 moves in a predetermined section. The ball 42 is disengaged from the ball locking portion 39a in the range in which the piston 30 moves beyond a predetermined section by locking the ball holding member 41 and suppressing the movement of the ball holding member 41 to make the urging force of the auxiliary spring 49 effective. Thus, there is provided a take-out and suspension type pivot type door closer in which the urging force of the auxiliary spring 49 is invalidated.

Here, when the piston 30 is in the range beyond the predetermined section in accordance with the opening operation of the door body 2, the piston case 39 moves the door body 2 in the door closing direction. It is preferable that a groove 60 for holding the door opening position that can be engaged with the ball 42 is formed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A take-out and suspension type pivot type door closer according to a first embodiment of the present invention is shown in FIGS.
1 will be described. FIGS. 1 and 2 show an attached state of a take-out and suspension type pivot type door closer 1 according to the present embodiment, in which a door body 2 has a door closing position located in a space within a door attaching frame 4 of a wall 3. The door is rotated to the door opening position that deviates from space. Upper frame 4A and lower frame (shoot sliding frame) 4B of door mounting frame 4
The upper frame-side upper pivot 5 and the lower frame-side lower pivot (not shown) are respectively buried and fixed in the horizontal direction, and the upper frame-side upper pivot 5 and the lower frame-side lower pivot are respectively connected to the upper frame 4A and the lower frame 4B. It is accommodated in the fixed upper pivot case 6 and lower pivot case 7. The upper pivot 5 fixes a pivot shaft 9 extending in the vertical direction by a bolt 8. The same applies to the lower pivot. This pivot shaft 9 is inserted and fixed to the upper pivot 5 on the upper frame side without rotating.

A gear case 10 is provided at the upper end of the door body 2 so as to protrude laterally from the door body 2. A pivot case 11 is provided at the lower end of the door body 2 so as to protrude laterally from the door body 2. A space is formed in the door main body 2 below the gear case 10 and the first casing 12 is housed in the space. Specifically, as shown in FIGS. 2, 3, and 4, the first casing 1
2 is a door width direction reinforcing member 13 provided on the door body 2.
Are fixed by screws 15 via a mounting plate 14, and are also fixed by screws 17 to a longitudinal reinforcing member 16 fixed to the door body 2. Therefore, the first casing 12 is held within the thickness range of the door body 2. Further, the gear case 10 is placed on the first casing 12 and the screws 18
Is fixed to the first casing 12.

In the gear case 10, a pivot gear 20, an idle gear 21, and a pinion gear 22 made of a standard spur gear are arranged, and are closed by an upper cover 23. That is, the idle gear 21 is meshed and disposed between the pivot gear 20 and the pinion gear 22. The pivot shaft 9 is supported by the gear case 10 via a bearing 19, so that the door body 2 rotates about the axis of the pivot shaft 9. The pivot gear 20 is fixed to the pivot shaft 9. The bearing 19 is fitted on the pivot shaft 9 with the pivot gear 20 interposed therebetween.

The idle gear 21 has a larger diameter than the pivot gear 20 and the pinion gear 22, and has an upper cover 23.
And a shaft 24 fixed between the bottom wall of the gear case 10 and the center of the gear case 10. The pinion gear 22 has an upper hole 27 and a lower hole 2 having a square hole shape.
6 is formed, and a pinion shaft 25 extending from the first casing 12 and having an upper portion in the shape of a square shaft is prevented from rotating around the lower hole 26 and inserted. A washer 28 is disposed in the upper hole 27, and the pinion shaft 25 is fixed to the pinion gear 22 with the washer 28 sandwiched between the screws 29. When the idle gear 21 rotates around the pivot gear 20 based on the opening / closing operation of the door body 2, the pinion gear 22 rotates with the rotation of the pivot gear 20, and transmits power to a piston 30 described later through a pinion shaft 25. Is what you do.

A circular hole 12A is formed in the first casing 12, and a piston 30 is provided in the circular hole 12A so as to be able to reciprocate. The first casing 12 is formed with a hole 12a that allows the pinion shaft 25 to pass therethrough and extends in the radial direction. The piston 30 divides the space in the circular hole 12A into the front chamber 31.
And the rear chamber 32. Piston 30 has through hole 30a
Are formed, and a rack 30b is formed in the through hole 30a. A pinion shaft 25 fixed to the pinion gear 22 is provided through the through hole 30a, and the pinion shaft 25 has a pinion gear 33 meshed with the rack 30b.
Is fixed. In addition, washers 34, 34, bearings 35, 35, O-rings 3 are provided above and below the pinion shaft 25 from both sides.
6 and 36, then pinion bush 3
7, 37 are fitted in the holes 12a, 12a. Thus, the pinion shaft 25 is rotatably supported within the first casing 12, and is provided so as not to be relatively movable in the lateral direction with respect to the first casing 12.

At the end of the rear chamber 32 of the first casing 12, a cylinder cap 38 is fitted into the circular hole 12A, and at the end of the front chamber 31 of the first casing 12, a cylindrical second casing 39 is provided. One end (inner end) is fitted into the circular hole 12A, and the other end (outer end) of the second casing 39 is fitted with a cylinder cap 40. The first casing 12, the cylinder caps 38 and 40, and the second casing 39 form a piston case. A step 39a is formed near the inner end of the inner peripheral surface of the second casing 39, and a cylindrical ball holding member 41 having a center hole 41b is slidably fitted therein. The ball holding member 41 is formed with four ball holding holes 41a at equal intervals in the circumferential direction.
2 are held. The ball 42 is held in the ball holding hole 41 so as to be able to contact the step 39a of the second casing 39.
a slightly protrudes radially outward from a. The ball holding hole 41a and the step portion 39a are set so that the ball 42 is sandwiched between the ball holding hole 41a and the step portion 39a from the closed state of the door body 2 to a certain opening angle. I have. That is, the step portion 39a forms a ball locking portion.

The piston 30 has a front chamber 31 and a through hole 30a.
A first oil passage 43 communicating with the rear chamber 32 and a second oil passage 44 communicating with the rear chamber 32 and the through hole 30a are formed. A cylindrical piston cap 45 is fitted on the rear chamber 32 side of the piston 30. Through hole 30a of piston cap 45
A valve seat 45A is formed in the vicinity of the end on the side, and a check valve 46 is provided so as to be seated there. A stopper 45B is provided on the end surface of the piston cap 45 on the rear chamber 32 side to prevent the check valve 46 from being detached from the piston cap 45. When the check valve 46 is seated on the valve seat 45A, the oil in the rear chamber 32 is discharged from the piston cap 45A.
When the check valve 46 is separated from the valve seat 45A, the oil in the through hole 30a passes through the second oil passage 44 and the piston. It can flow through the cap 45 to the rear chamber 32.

A long rod 47 extends from the center of the end surface of the piston 30 on the front chamber 31 side in the longitudinal direction of the front chamber 31 and is fixed. The free end of the rod 47 is inserted into the center hole 41b of the ball holding member 41. At a position closer to the piston 30 than the position of the step portion 39a of the second casing 39, an annular ball holding groove 47A is formed on the outer peripheral surface of the rod 47, and the rod 47 and the ball holding member 41 are fixed to each other. When the ball is in the positional relationship of 2, the ball 42 moves inward in the radial direction of the ball holding member 41,
The ball 42 is fitted into the annular ball holding groove 47A so that the rod 47 and the ball holding member 41 can be moved integrally.

The end face of the piston 30 on the front chamber 31 side and the second
Between the inner ends of the casing 39, a rod 47 is
A main spring 48 having substantially the same diameter as the circular hole 12A in the casing 12 is provided. The main spring 48 biases the piston 30 toward the rear chamber 32. Further, between the end surface of the piston 30 on the front chamber 31 side and the end surface of the ball holding member 41 provided at the tip of the rod 47, a sub-spring 49 smaller in diameter than the main spring 48 is externally mounted on the rod 47 and has a radius of the main spring 48. It is provided inside in the direction. The main spring 48 always urges the piston 30 in the door closing direction X, and the sub-spring 49 also urges the piston 30 in the door closing direction X in a predetermined rotation section of the door body 2.

As shown in FIGS. 2, 3, 9 to 11, a first speed adjusting valve 50 and a second speed adjusting valve 51 as an opening / closing speed adjusting mechanism of the door body 2 are provided in the first casing 1
2 are provided to extend in parallel with each other at a lower portion. An H-shaped first oil passage 52 that communicates with the first speed control valve 50 and a substantially H-shaped second oil passage 53 that communicates with the second speed control valve 51 are provided separately at a lower portion of the first casing 12. It is formed. The first oil passage 52 has a piston 3
And a second opening 52a that is open in the through hole 30a of the first piston 30 and a second opening 52a that is closed on the outer peripheral surface of the piston 30 or that communicates with the rear chamber 32
The second oil passage 53 has an opening 52b,
And a second opening 53b closed on the outer peripheral surface of the piston 30 or communicated with the rear chamber 32. By adjusting the throttle of these speed control valves 50 and 51, the first oil passage 5 is closed when the door body 2 is closed.
2 and the front chamber 31 from the rear chamber 32 through the second oil passage 53.
By adjusting the flow rate of the oil when the oil flows, the door closing speed can be adjusted in two stages.

In the above configuration, when the door body 2 is at the door closing position (the door opening angle is 0 °), the urging force of both the main spring 48 and the sub-spring 49 is applied to the piston 30 as shown in FIG. Accordingly, the first casing 12 is located on the leftmost side in the circular hole 12A.
That is, the ball 42 held in the ball holding hole 41a is in a state of being locked by the step portion 39a, and the ball holding member 41
Is prevented from moving rightward, the urging force of the sub-spring 49 acts on the step portion 39 a via the ball holding member 41 and the ball 42, and can also act on the piston 30.

As shown in FIG. 11, the piston 3
0 is on the leftmost side, the second oil passage 52
The opening 52b is closed by the outer peripheral surface of the piston 30,
The second opening 53b of the second oil passage 53 is not completely closed by the tapered surface at the tip of the piston 30, but is mostly closed by the outer peripheral surface of the piston 30. Therefore, the oil does not flow from the front chamber 31 to the rear chamber 32 through the oil passage 52, and the oil passage 53
A little oil flows.

Next, when the door body 2 is gradually opened in the door opening direction about the axis of the pivot shaft 9, the pivot gear 20 is opened.
Is fixed to the upper frame-side upper pivot 5 and thus does not rotate. However, as the door body 2 rotates, the idle gear 21 rotates around the pivot gear 20, and the pinion gear 22 meshing with the idle gear 21 rotates. . Gear 2 for pinion
2 is fixed to and integrated with the pinion shaft 25, so that the pinion shaft 25 rotates in the clockwise direction in FIG. Therefore, the pinion shaft 25
And the integrated pinion 33 rotates in the same direction.
Of the front chamber 3 by the engagement of the
Move in one direction.

FIG. 6 shows the inside of the first casing 12 when the door body 2 is opened by 30 °. Piston 30 is front chamber 3
While moving in one direction, the ball 42 is
The ball holding member 41 does not move, but the free end of the rod 47 extending from the front chamber side end surface of the piston 30 moves in the center hole 41b of the ball holding member 41 toward the cylinder cap 40. . The ball holding groove 47A formed on the rod 47 moves to a position near the locking position of the ball 42, and the ball 42 is about to be fitted into the ball holding groove 47A. In this state, the urging force of the sub-spring 49 can still act on the piston 30. Also, with the movement of the piston 30 toward the front chamber 31,
The check valve 46 is urged by the oil in the direction of the stopper 48B, and the oil in the front chamber 31 is released from the first oil passage 43, the through hole 30a, the second oil passage 44 formed in the piston 30 and the check valve 4
6 and flows into the rear chamber 32.

The door body 2 is further rotated in the door opening direction to move the piston 30 further toward the front chamber 31 so that the door body 2
When the ball is opened by about 40 °, the ball 42
1, the ball 42 completely fits into the ball holding groove 47A by moving inward in the radial direction, the ball holding member 41 becomes movable with the rod 47 via the ball 42, and the ball 42 It separates from step part 39a. Therefore, the urging force of the sub-spring 49 does not act on the piston 30, and the urging force of only the main spring 48 acts on the piston 30. Therefore, compared to the initial door opening state, the resistance to door opening is reduced, and the door body 2 can be opened with less force.

FIG. 7 shows the inside of the first casing 12 with the door body 2 opened by 55 °. In this state, the ball 42 has been completely fitted into the ball holding groove 47A, the ball 42 has completely separated from the step portion 39a of the second casing 39, and the urging force of the sub-spring 49 does not act on the piston 30; The urging force of only the spring 48 acts on the piston 30.

FIG. 8 shows a state in which the door body 2 is opened by 65 °.
The ball holding member 41 slides along the inner peripheral surface of the second casing 39 in the direction of the cylinder cap 40 with the movement of the piston 30 because the ball holding member 41 is integrated with the ball holding member 41.

As for the closing operation, FIG. 8, FIG. 7, FIG.
The reverse operation is performed in the order of FIG. Therefore, FIG.
7 to FIG. 7, the door body 2 is closed by the urging force of the main spring 48 (normal urging force).
5 to 5, the urging force of the sub-spring 49 is applied, so that the door closing force is increased. As described above, when the door body 2 is opened and closed in the range of 0 ° to about 40 °, the urging force of the main spring 48 and the sub-spring 49 acts on the piston 30, so that a strong door closing force can be generated. When the door body 2 is opened and closed at an angle larger than that, the urging force of only the main spring 48 acts.
The door can be opened with the same force as a conventional door closer.

The operation of the speed adjusting mechanism in the door closing operation will be described with reference to FIGS. In the closing operation, the oil in the rear chamber 32 is supplied to the first oil passage 52.
Alternatively, it is caused to flow into the front chamber 31 via the second oil passage 53. As shown in FIG. 9, when the door body 2 is at the 70 ° closed position, the first opening 53 of the second oil passage 53 is provided.
a is closed by the piston 30. On the other hand, the first opening 52a and the second opening 52b of the first oil passage 52 are not closed by the piston 30. Accordingly, the oil in the rear chamber 32 flows into the front chamber 31 through the through hole 30a of the piston only through the first oil passage 52. At this time, the flow rate is adjusted by the first speed control valve 50, and accordingly The door body 2 is closed at the speed set by the first speed adjusting valve 50 in combination with the urging force of the spring 48.

As shown in FIG.
When the door is in the closed position of 30 ° to 30 °, the second opening 52b of the first oil passage 52 is closed by the piston 30. On the other hand, the first opening 53a and the second opening 53b of the second oil passage 53 are not closed by the piston 30. Accordingly, the oil in the rear chamber 32 flows into the front chamber 31 only through the second oil passage 53 through the through hole 30a of the piston. At that time, the flow rate is adjusted by the second speed control valve 51, and accordingly, The door body 2 is closed at the speed set by the second speed adjusting valve 51 in combination with the urging forces of the main spring 48 and the sub spring 49.

FIG. 11 shows a state in which the door body 2 is completely closed. As described above, the second opening 52b of the first oil passage 52 is closed by the piston 30, and the front passage 52 is moved from the old passage 52 to the front chamber. No oil flows into 31. At this time, the second opening 5 of the second oil passage 53 is formed.
3 b is slightly open facing the tapered surface of the piston 30, so that oil flows through the OR passage 53.

A take-out hanging pivot door closer according to a second embodiment of the present invention will be described with reference to FIG. This lift-out type pivot type door closer according to the first embodiment is different from the lift-out type pivot type door closer according to the first embodiment in that when the door body 2 that has been opened is rotated in the closing direction to a predetermined angle, the door position is changed. The configuration for holding is added. That is, a shallow stop groove 60 following the spherical surface of the ball 42 is provided on the inner peripheral surface of the second casing 39 'and closer to the cylinder cap 40 than the step 39a.
Is formed, and is configured to be engageable with the ball 42. If the depth of the groove 60 is too large, the ball 42 will not fall out of the groove 60, so that the ball 60 escapes from the groove 60 with a force enough to pull the door body 2 lightly in the closing direction. It is formed as deep as possible.

When the door body 2 is gradually turned in the closing direction from the state where the door body 2 is open, the ball 42
Moves along with the movement of the rod 47 along the inner peripheral surface of the second casing 39 ′, and the ball 42 moves into the stop groove 6.
When it reaches zero, the ball 42 falls into the stop groove 60 and engages with it, giving resistance to the door closing operation of the door body 2. That is, the stop groove 60 functions as a door opening position holding unit for holding a predetermined door opening position of the door body 2.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims. For example, the position of the step portion 39 ′ formed on the second casing 39 is formed at a position where the step portion 39 ′ is engaged with the ball 42 when the door body 2 is closed by about 40 degrees. However, the position of the step portion 39 'may be changed so that the door closing force increases from a desired door closing angle. Further, even if the position of the ball holding groove 47A formed in the rod 47 is changed from the current position to the left and right direction in FIG. 3, the angle for increasing the door closing force can be changed.

In the second embodiment, the door opening stop position can be set to a desired position by appropriately selecting the position of the stop groove 60. Further, a gear case 10 in which gear trains 20, 21, 22 and the like are arranged.
, A rail is laid on the upper frame 4A, one end of the arm is rotatably and slidably attached to the rail, and the other end of the arm is connected to a pinion shaft 25 extending from a piston, thereby providing a concealed type. It can be used as a door closer.

[0037]

According to the present invention, when the door body is opened, the door can be opened from a specific angle with the same opening force as a normal door closer. When closing the main body, by operating the auxiliary spring from a specific angle, it is possible to gradually increase the closing torque with the spring and the auxiliary spring, and to close with a closing force greater than the original closing force. Become. Here, since the torque of the door closing force is increased by the urging force of the auxiliary spring in addition to the spring in the first casing without using the eccentric gear, the reciprocating linear motion of the idle gear shaft is not required, and the gear train is not required. No rattling occurs due to wear of the gear shaft in the above, so that the transmission efficiency from the gear train to the piston is also maintained well. Also, since it is not necessary to use an eccentric gear which is difficult to manufacture, gears such as standard spur gears can be easily manufactured and assembly is simplified.

According to the second aspect of the present invention, the door body can be opened at a desired position only by forming a groove for holding the door at the inner peripheral surface of the piston case. It is possible to hold the door at the door position, and it is not necessary to separately provide a door opening position holding mechanism.

[Brief description of the drawings]

FIG. 1 is a schematic front view showing a mounting mode of a take-out and suspension type pivot type door closer of the present invention to a door body and a door mounting frame.

FIG. 2 is a side cross-sectional view showing a mounting mode of the take-out and suspension type pivot type door closer of the present invention to a door body and a door mounting frame.

FIG. 3 is a front side sectional view of a take-out and suspension type pivot type door closer according to the first embodiment of the present invention.

FIG. 4 is a plan view showing the take-out and hanging pivot type door closer according to the first embodiment of the present invention, including a horizontal sectional view taken along the line IV-IV of FIG. 3;

FIG. 5 is a cross-sectional view showing the inside of a piston case of the take-out and suspending pivot type door closer according to the first embodiment of the present invention with the door body opened.

FIG. 6 is a cross-sectional view showing the inside of a piston case of the take-out and suspension type pivot type door closer according to the first embodiment of the present invention in a state where the door body is opened by 30 degrees.

FIG. 7 is a cross-sectional view showing the inside of a piston case of the take-out and suspension type pivot type door closer according to the first embodiment of the present invention in a state where the door body is opened by 55 degrees.

FIG. 8 is a cross-sectional view showing the inside of a piston case of the take-out and hanging pivot type door closer according to the first embodiment of the present invention in a state where the door body is opened by about 65 degrees.

FIG. 9 is a diagram showing a positional relationship between a piston of the lift-out type pivot type door closer according to the first embodiment of the present invention in a state where the door body is closed at the 70-degree position and an opening of the oil passage; FIG. 2A is a sectional view taken along line AA of FIG. 2 showing a positional relationship between a piston and an opening of a second oil passage. FIG. 2B is a sectional view showing a positional relationship between the piston and an opening of a first oil passage. FIG. 3 is a sectional view taken along the line AB in FIG. 2.

FIG. 10 is a view showing the positional relationship between the piston of the lift-out type pivot type door closer according to the first embodiment of the present invention and the opening of the oil passage in a state where the door body is closed at the position of 25 ° to 30 °. (A) is a sectional view taken along line AA of FIG. 2 showing a positional relationship between the piston and the opening of the second oil passage, and (B) is a sectional view of the piston and the opening of the first oil passage. Sectional drawing which followed the AB line of FIG. 2 which shows a positional relationship.

FIG. 11 is a view showing a positional relationship between a piston and an opening of an oil passage of the take-out and suspending pivot type door closer according to the first embodiment of the present invention in a state where the door body is closed, and FIG. FIG. 3B is a cross-sectional view along a line AA of FIG. 2 showing a positional relationship between a piston and an opening of a second oil passage (B).
FIG. 3 is a cross-sectional view taken along line AB in FIG. 2 showing a positional relationship between a piston and an opening of a first oil passage.

FIG. 12 is a partial front side sectional view of the inside of a piston case of a take-out and suspension type pivot type door closer according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lift-out suspension type pivot door closer 2 Door body 4 Door mounting frame 9 Pivot shaft 10 Gear case 12 First casing 20 which constitutes a piston case 20 Pivot gear 21 which constitutes a gear train 21 Idle gear which constitutes a gear train 22 Constitutes a gear train Pinion gear 25 Pinion shaft 30 Piston 30b Rack 33 Pinion gear 38 Cylinder cap constituting a piston case 39 Second casing 39a constituting a piston case 39a Step as a ball locking portion 40 Cylinder cap constituting a piston case 41 Ball holding member 42 Ball 47 Rod 48 Main spring which is a spring 49 Sub-spring which is an auxiliary spring 60 A groove for a stop which is a groove for holding an open position

Claims (2)

(57) [Claims] 1. A gear case located at an upper part of a door body, a pivot shaft extending from a mounting frame surrounding the door body, constituting a rotation axis of the door body, and having one end housed in the gear case. A gear train accommodated in a gear case and connected to the pivot shaft, a piston case provided in the door body, a piston provided in the piston case to be reciprocally movable and having a rack formed therein, A pinion shaft connected to the gear train and extending from the gear case into the piston case for connecting the row and the piston; a pinion meshed with the rack and provided on the pinion shaft; and And a spring provided in the piston case for biasing one end of the piston for biasing in a door closing direction. A rod interlocking with the movement of the piston is provided in a space in the piston case on one end side of the piston, and a ball locking portion is provided in the piston case, and the rod faces the ball locking portion. A ball holding member is movably provided at a position, a ball is always accommodated in the ball holding member, and an auxiliary spring is provided between the piston and the ball holding member. In a range where the ball moves over a predetermined section, the ball is locked to suppress the movement of the ball holding member to enable the urging force of the auxiliary spring, and when the piston moves beyond the predetermined section, the ball is locked with the ball. Wherein the auxiliary spring is disengaged from the portion and the urging force of the auxiliary spring is invalidated. 2. The piston case is engaged with the ball in a process of moving the door body in the door closing direction when the piston is in a range beyond the predetermined section with the opening operation of the door body. 2. A lift-out pivot type door closer according to claim 1, further comprising a possible opening position holding groove.