CN109779435B

CN109779435B - Door closer

Info

Publication number: CN109779435B
Application number: CN201811236904.9A
Authority: CN
Inventors: 托尔斯滕·希尔曼; 托马斯·萨吕扎基; 托马斯·维尔德福斯特
Original assignee: Dorma Deutschland GmbH
Current assignee: Dorma Deutschland GmbH
Priority date: 2017-11-14
Filing date: 2018-10-23
Publication date: 2022-01-18
Anticipated expiration: 2038-10-23
Also published as: CN109779435A; TWI801444B; EP3483373B1; EP3483373A1; DK3483373T3; TW201923209A

Abstract

The invention relates to a door closer (14), in particular a sliding door closer, for a door leaf (10), wherein the door closer has a closing hydraulic system (22) for adjusting the closing speed of the door leaf. The closed hydraulic system comprises a first fluid path (E) having a first fluid flow regulating valve (36) through which a fluid flow flows during the closing of the door leaf in a first door corner closing region (A) of the door closer. The closing hydraulic system comprises a second fluid path (F) having a first and a second fluid flow control valve (38), through which the fluid flow flows during the closing of the door leaf in a second door angle closing region (B) of the door closer, wherein a switchable closing speed change, in particular a closing delay, of the door closer in the second door angle closing region (B) can be set by means of the second fluid flow control valve relative to the first door angle closing region (A).

Description

Door closer

Technical Field

The invention relates to a door closer for a door leaf, in particular to a sliding rail type door closer.

Background

A sliding door closer is known from EP 1362155B 1. The sliding door closer has a piston which is guided in a housing and is supported on a closing spring, and a pinion which is eccentrically rotatably mounted on the housing and meshes with a toothed rack of the piston.

DE 202008005721U 1 discloses a door closer with hydraulic closing delay. The door closer has a door closer shaft which can be coupled to the door leaf and which can be rotated from a closed position in at least one rotational direction and is connected to a travel cam disk which is mounted in the housing. The travel cam disk cooperates with at least one active element, which is connected to a hydraulic damping device and is accommodated in an oil-extruded hydraulic piston. The contour section of the travel cam disc, which cooperates with the actuating element, has a corner section which, with respect to the angle of rotation of the travel cam disc, causes an increased travel of the hydraulic piston for increasing the oil pressure in order to achieve a delay of the closing movement of the door leaf on this corner section.

Furthermore, it is known to provide a door closer with a closing hydraulic system, which has a plurality of fluid paths with control valves for setting the closing speed of the door leaf in successive closing phases or door angle closing regions. The setting of the regulating valve must be carried out separately in the closing phase to prevent the door leaf from being hit. This can be error prone and very costly.

Disclosure of Invention

It is therefore an object of the present invention to provide a door closer which makes it possible to set the closing speed for a plurality of closing phases, i.e. door angle closing regions, in a simple and rapid manner.

This object is achieved by a door closer. Advantageous refinements are also specified in this context.

The door closer is especially a sliding door closer for a door leaf. The door closer has a closing hydraulic system (e.g. a damping hydraulic system) for setting the closing speed of the door leaf. The closed hydraulic system includes a first fluid path having a first fluid flow-regulating valve. During the closing of the door leaf in the first door angle closing region of the door closer, the fluid flow flows through the first fluid flow control valve. The closed hydraulic system includes a second fluid path having a first fluid flow-regulating valve and a second fluid flow-regulating valve. During the closing of the door leaf in the second door corner closing region of the door closer, the fluid flow flows through the first and second fluid flow regulating valves. By means of the second fluid flow control valve, a switchable closing speed change, in particular a closing delay, of the door closer in the second door angle closing region relative to the first door angle closing region can be set.

The common use of one control valve by both fluid paths and the use of a second switchable control valve for one of the fluid paths makes it possible to: the change in the closing speed of the door leaf can be selectively switchable by the second door corner closing region. Therefore, the following feasibility exists: the second regulating valve is not regulated away from the initial position. The impact of the door leaf in the first and second door corner closing region can already be prevented by the setting of the first regulating valve. By not necessarily setting the second control valve, the setting of the door closer can be carried out more quickly and more simply. If desired, an additional closing delay can be set in the second gate angle closing region by means of the second control valve.

In particular, the first fluid path may not have a second regulating valve.

In a particularly preferred embodiment, the second door corner closure zone is located within the first door corner closure zone. Thus, for example, a closing delay can be provided by a second door angle closing region in a section of the first door angle closing region.

In one embodiment, in the second fluid path, a second fluid flow-regulating valve is connected in series with the first fluid flow-regulating valve. In particular, a switchable closing delay can thereby be set by means of the second fluid flow control valve.

In one embodiment, the first corner closure zone and the second corner closure zone have a common starting point. Alternatively or additionally, the second door angle closing area is smaller than the first door angle closing area. However, for example, the closing delay can also be provided by a second door angle closing region in a section of the first door angle closing region.

In another embodiment, a closed hydraulic system has a first pressure chamber and a second pressure chamber. The first fluid path fluidly connects the first and second pressure chambers within a section of the first gate angle closure area that does not intersect the second gate angle closure area. The second fluid path fluidly connects the first and second pressure chambers to each other within the second gate angle closure region. The setting of the first control valve therefore takes place for the first gate angle closing region and the second gate angle closing region contained therein. In contrast, the setting of the second control valve is effected only for the second gate angle closing region.

In particular, the first and second fluid paths may have a fluid connection between the first pressure chamber and the first fluid flow control valve, wherein the fluid connection is formed by a first channel, in particular a bore (e.g. a blind bore), in the housing of the door closer. Preferably, the second fluid path has a fluid connection between the first fluid flow control valve and the second fluid flow control valve, wherein the fluid connection is formed by a second channel, in particular a bore (e.g. a blind bore), in the housing of the door closer. Preferably, the first and second channels may be arranged side by side.

In a preferred embodiment, the closing speed of the door closer (and thus of the door leaf) in the first and second door angle closing region can be set by means of the first fluid flow control valve.

In a preferred embodiment, the first door angle closing region begins in a region between a 180 ° closing angle and a 120 ° closing angle (for example at a 180 °, 125 ° or 110 ° closing angle) and/or ends in a region between a 30 ° closing angle and a 10 ° closing angle (for example at 15 °). Alternatively or additionally, the second door angle closing region begins in a region between a 180 ° closing angle and a 120 ° closing angle (for example at a 125 ° or 120 ° closing angle) and/or ends in a region between a 90 ° closing angle and a 60 ° closing angle (for example at a 70 ° closing angle). The switchable closing delay in the second door corner closing region can thus, for example, provide sufficient time for luggage, baby carriages, hospital beds, etc. to pass through the door without having to hold the door leaf fixedly.

In particular, the door leaf is closed at a closure angle of 0 °.

It is possible that in a door angle closing region which is larger than the first door angle closing region, for example in a region between a 180 ° closing angle and a 125 ° or 120 ° closing angle, the closing hydraulic system for setting the closing speed of the door leaf can be deactivated. However, the closing hydraulic system may also be active already at a closing angle of, for example, 180 ° and/or the first door closing region starts at a closing angle of 180 °.

In another embodiment, the first fluid path and the second fluid path have a common fluid path section disposed upstream of the first fluid flow-regulating valve. Thus, a common channel for the first and second fluid paths can be advantageously used, so that for example fewer holes are required for arranging the first and second fluid paths.

In one embodiment, in the second fluid path, the second fluid flow-regulating valve is disposed downstream of the first fluid flow-regulating valve. It is thus ensured that the switchable throttling of the fluid flow already throttled by the first regulating valve by the second regulating valve is possible in the second fluid path. The switchable throttling corresponds to a switchable closing delay.

In another embodiment, the closed hydraulic system has a third fluid path with a third fluid flow-regulating valve. The fluid flow flows through the third fluid path (and the third fluid flow-regulating valve) during the closing of the door leaf in the third door angle closing region. Furthermore, the closed hydraulic system may also include a fourth fluid path having a fourth fluid flow-regulating valve. The fluid flow flows through the fourth fluid path (and the fourth fluid flow-regulating valve) during the closing of the door leaf in the fourth door corner closing region. Thus, other door corner closing regions can be provided for the door closer, for example to provide a soft closing of the door and a quick end stop for reliably closing the door.

In one embodiment, the third corner closure zone is connected to the first corner closure zone and/or the fourth corner closure zone is located within the third corner closure zone. There is no gap between the first and second door corner closure zones. In addition, the closing speed in a section of the third door angle closing region can be varied over the fourth door angle closing region.

In a further embodiment, the third door angle closing region starts in a region between 30 ° closing angle and 10 ° closing angle (for example at 15 ° closing angle) and/or ends at 0 ° closing angle. Alternatively or additionally, the fourth door angle closing region begins in a region between the 15 ° closing angle and the 5 ° closing angle (for example at the 7 ° closing angle) and/or ends at the 0 ° closing angle. In the third door angle closing region, a gentle closing of the door leaf can thus be set, while in the fourth door angle closing region a faster closing speed can be set, so that the door leaf closes reliably.

In one embodiment, the closed hydraulic system further comprises a housing having a plurality of through holes. A fluid flow control valve (e.g., a first fluid flow control valve, a second fluid flow control valve, a third fluid flow control valve, and/or a fourth fluid flow control valve) is received in the through bore. The fluid flow regulating valve is configured such that the fluid flow regulating valve can be set from both end sides of the through hole, respectively. This increases the possibilities for mounting the door closer.

The door closer can thus be designed in particular for a door leaf mounting on the door leaf hinge side, a frame top mounting on the door leaf opposite hinge side and a door leaf mounting on the door leaf opposite hinge side.

In another embodiment, the closed hydraulic system further comprises: a rotatably mounted closer shaft having a cam disc; a hydraulic piston having a cam follower (e.g., a roller) that follows a cam plate; and/or a housing in which the hydraulic piston is guided between the first pressure chamber and the second pressure chamber.

In particular, the closer shaft can be connected to a connecting rod of the door closer, which connecting rod is intended to be connected to a sliding rail of the door closer.

In one embodiment, the first fluid path has a first groove in the hydraulic piston, which presets the beginning and/or the length of the first gate angle closing region. Alternatively or additionally, the second fluid path has a second groove in the hydraulic piston, which presets the beginning and/or the length of the second gate angle closing region. Alternatively or additionally, the third fluid path has a third groove in the hydraulic piston, which presets the beginning and/or the length of the third door angle closing region. Alternatively or additionally, the fourth fluid path has a shoulder on the hydraulic piston, which presets the beginning of the fourth gate angle closing region. The door angle closing region is therefore predetermined by the movement of the hydraulic piston caused by the cam when pivoting the door leaf.

In another embodiment, the first fluid path has a first radial channel in the hydraulic piston, the second fluid path has a second radial channel in the hydraulic piston, the third fluid path has a third radial channel in the hydraulic piston and/or the fourth fluid path does not have a radial channel in the hydraulic piston.

Drawings

The above-described preferred embodiments and features of the invention can be combined with one another as desired. Further details and advantages of the invention will be described below with reference to the accompanying drawings. Shown in the figure are:

fig. 1 shows a schematic view of a door leaf which can be closed by means of a door closer in a door angle closure zone of 180 °;

fig. 2 shows a schematic view of a closing region of a door closer;

fig. 3 shows a sectional view of the closer body of the door closer with the door leaf closed (i.e. at a door closing angle of 0 °);

fig. 4 shows a sectional view of the closer body of the door closer with the door leaf closed at the beginning of the first and second door angle closing zones, for example at a door closing angle of about 125 °;

fig. 5 shows a sectional view of the closer body of the door closer when the door leaf is closed at the end of the second door angle closing region, for example at a door closing angle of about 70 °;

fig. 6 shows a sectional view of the closer body of the door closer when the door leaf is closed at the end of the first door angle closing region and at the beginning of the third door angle closing region, for example at a door closing angle of about 15 °; and

fig. 7 shows a sectional view of the closer body of the door closer when the door leaf is closed at the beginning of the fourth door angle closing region, for example at a door closing angle of approximately 7 °.

The embodiments shown in the figures are at least partially identical, so that similar or identical parts have the same reference numerals, and for the sake of illustration reference is also made to the description of the other embodiments or the figures to avoid repetition.

Detailed Description

In fig. 1, a view of a door leaf (door leaf) 10 is schematically shown from above. The door leaf 10 is pivotably connected to the door frame by one or more door hinges 12. The door leaf 10 can be opened and closed in an area of about 180 °. The closing characteristic of the door leaf 10 can be set by means of the door closer 14 and in particular when closing.

As shown in fig. 1, the door closer 14 may be configured as a so-called slide type door closer, for example. The door closer 14 has a closer body 16, a link 18 and a slide rail 20. The modular construction allows the closer body 16 to be combined with different slide rails 20.

In the embodiment shown, the closer body 16 is mounted on the door leaf 10 on the hinge side of the door leaf 10 with respect to the door hinge 12. In other embodiments, the closer body 16 may also be mounted on the door frame (top mounted) and/or on the opposite side of the hinge.

By means of the closer body 16, different closing speeds and delays can be set depending on the door closing angle during the closing of the door leaf 10. In other words, during closing, the door 10 may close quickly in certain angular regions and slowly in certain angular regions.

In fig. 1, four corner closure zones are schematically shown, for which different closure speeds and delays can be set by means of the closure body 16. In particular, the closing hydraulic system of the closer body 16 may be used to set the closing speed within the first door angle closing region a. Alternatively, in addition to the second door corner closing region B located within the first door corner closing region a, a closing delay may be set. Next to the first door angle closing region a, a third door angle closing region C may be set and within the third door angle closing region C, a fourth door angle closing region D may be set.

The closing hydraulic system of the door closer 14 can be configured such that it is already active, for example from 180 °, or first from 125 ° or 120 °. The first door angle closing region a may extend, for example, between 125 ° and 15 °. In the first door corner closing region a, a basic closing speed of the door leaf 10 can be set. The second door angle closing region B may extend, for example, between 125 ° and 70 °. For example, the first and/or second door corner closure zones may also begin earlier and/or end later. In the second door corner closing region B, an additional delay may be set, if necessary. Thus, for example, sufficient time can be provided for luggage, baby carriages, hospital beds, etc. to pass through the door. The third door angle closing region C may extend, for example, between 15 ° and 0 °. For example, the third corner closing region C may be set so that the door leaf 10 can be closed almost silently. The fourth door angle closing region D may extend, for example, between 7 ° and 0 °. Here, the speed at the time of the final impact can be set so as to ensure that the door leaf 10 is positively closed, for example under elastic deformation of the door seal.

The four door corner closing regions a to D are again schematically shown in the diagram of fig. 2. Here, it should be emphasized that the door closer 14 of the invention can in particular only optionally set the second door corner closing region B. Without adjusting the second door angle closing area B, the door leaf 10 can be closed at a uniform speed within the first door angle closing area a. The door corner closing region B may be additionally added as a closing delay if necessary. The basic setting of the door closer 14 can be carried out more easily and in particular more quickly by means of only an optional closing delay in the door corner closing region B.

In this case, it should also be emphasized that the door corner closure regions a and B interact with one another. That is, the setting regarding the closing speed in the door angle closing region a indicates the initial speed for delay in the door angle closing region B. Specifically, a plurality of regulating valves are provided for setting four gate angle closing regions a to D, as will be described in detail below with reference to fig. 3 to 7.

Fig. 3 shows a longitudinal section through the closer body 16 in the closed state of the door leaf 10. The closer body 16 has a closing hydraulic system (damping hydraulic system) 22 for influencing the closing behavior of the door leaf 10 and an opening hydraulic system 24, which is not described in detail here, for influencing the opening behavior of the door leaf 10.

The closure hydraulic system 22 has a closure shaft 26, a hydraulic piston 28, a housing 30, a first pressure chamber (damping chamber) 32 and a second pressure chamber 34. Additionally, the closed hydraulic system 22 has four

regulator valves

36, 38, 40, and 42 for regulating the fluid flow.

The closer shaft 26 is connected to the slide rail 20 by the link 18 (see fig. 1). The shutter shaft 26 is rotatably supported in the housing 30. The closer shaft 26 has a cam plate 44. The cam disk 44 can be formed, for example, in the shape of a heart.

The hydraulic piston 28 is reciprocatingly disposed in a housing 30. Hydraulic piston 28 defines a first pressure chamber 32 and a second pressure chamber 34. Movement of hydraulic piston 28 changes the volume of first pressure chamber 32 and second pressure chamber 34. The hydraulic pistons 28 have cam followers 46, such as rotatable rollers, for following the cam profile of the cam plate 44. The hydraulic piston 28 is supported via a damping spring 48 on a cover 50, which cover 50 is fixed on the housing 30.

The hydraulic piston 28 has a relief valve (check valve) 52. When the door is opened, the hydraulic piston 28 moves in the direction of the closer shaft 26 (to the right in fig. 3), the relief valve 52 opens, and fluid flows from the second pressure chamber 34 into the first pressure chamber 32. When the door is closed, the hydraulic piston 28 is moved by the cam plate 44 in a direction away from the closer shaft 26 (to the left in fig. 3). The safety valve 52 is closed. Fluid flows from first pressure chamber 32 into second pressure chamber 34 via at least one of a plurality of fluid paths depending on the current door closure angle. By specifically influencing the fluid flow in the fluid path, a desired closing characteristic of the door can be set.

The regulating

valves

36, 38, 40, 42 are accommodated in through-

holes

37, 39, 41, 43 in the housing 30. For example, the first regulating valve 36 is provided in the first through hole 37. The through holes 37, 39, 41, 43 connect opposite longitudinal outer sides of the housing 30 of the closure body 16. The regulating

valves

36, 38, 40, 42 can be regulated from both sides of the through-

holes

37, 39, 41, 43. This increases the installation possibilities of the closer body 16 and thus the flexibility of the door closer 14.

Fig. 4 shows a dashed fluid path F (also referred to herein as a second fluid path) connecting the first pressure chamber 32 with the second pressure chamber 34 within the second gate angle closing region B (see fig. 1 and 2). The start, width and end of the second gate angle closure zone B are preset by the positioning and length of the slot 58 in the hydraulic piston 28. Through the groove 58, the fluid flow is directed by the first and

second regulator valves

36, 38 into a radial passage 60 of the hydraulic piston 28 to the second pressure chamber 34. In particular, the second fluid path F has a first regulating valve 36 and a second regulating valve 38. In the second fluid path F, the first regulating valve 36 and the second regulating valve 38 are connected in series. The second regulator valve 38 is disposed downstream of the first regulator valve 36.

Fig. 5 shows a first fluid path E in dashed lines. The first fluid path E connects the first pressure chamber 32 with the second pressure chamber 34 in a section of the first door angle closing area a which does not intersect the second door angle closing area B (see fig. 1 and 2). The start, width and end of the first gate angle closure zone a are preset by the positioning and length of the slot 54 in the hydraulic piston 28. Through the groove 54, the fluid flow is guided by the first control valve 36 into a radial channel 56 of the hydraulic piston 28 to the second pressure chamber 34. In particular, the first fluid path E has a first regulating valve 36. In contrast to the second fluid path F, the first fluid path E does not have the second regulating valve 38.

Therefore, by setting the first regulating valve 36, the closing speed of the door leaf 10 in the first door angle closing region a can be set. If the second control valve 38 is not controlled, the closing speed set by the first control valve 36 is maintained in the second gate angle closing range B, through which the second fluid path F flows. The second regulator valve 38 does not throttle the fluid flow in the initial position. However, the second regulating valve 38 can also be regulated away from the initial position. Then, an additional closing delay can be set by adjusting the second regulating valve 38 in the second gate angle closing region B.

Fig. 6 shows a third fluid path G in broken lines. The third fluid path G connects the first pressure chamber 32 with the second pressure chamber 34 in the third door angle closing region C (see fig. 1 and 2). Through the groove 62, the fluid flow is guided from the third regulating valve 40 into a radial channel 64 of the hydraulic piston 28 to the second pressure chamber 34.

Fig. 7 shows a third fluid path G in broken lines and a fourth fluid path H in broken lines. In addition to the third fluid path G, the fourth fluid path H connects the first pressure chamber 32 with the second pressure chamber 34 in the fourth door angle closing region D (see fig. 1 and 2). The start, width and end of the third gate angle closure zone C are preset by the location and length of the shoulder 66 on the hydraulic piston 28. In the fourth fluid path H, the third regulating valve 40 is bypassed (not bypassed). Fluid flow is directed from the fourth regulator valve 42 to the second pressure chamber 34 through the shoulder 66.

The invention is not limited to the preferred embodiments described above. On the contrary, many modifications and variations are possible which likewise make use of the inventive concept and therefore fall within the protective scope of the invention. The invention also claims the subject matter and features of the dependent claims, in particular independently of the cited claims. In particular, the features of the dependent claims are also independent of all features of the independent claim 1 and are disclosed, for example, independently of the features of the independent claim 1 with regard to the presence and configuration of the closed hydraulic system, of the first fluid path, of the second fluid path, of the first regulating valve and/or of the second regulating valve.

List of reference numerals

10 door leaf

12 door hinge

14 door closer

16 closure body

18 connecting rod

20 slide rail

22 closed hydraulic system

24-opening hydraulic system

26 closer shaft

28 Hydraulic piston

30 casing

32 first pressure chamber

34 second pressure chamber

36 first regulating valve

37 first through hole

38 second regulating valve

39 second through hole

40 third regulating valve

41 third through hole

42 fourth regulating valve

43 fourth through hole

44 cam disc

46 cam follower

48 damping spring

50 cover

52 safety valve

54 first groove

56 first radial passage

58 second groove

60 second radial passage

62 third groove

64 third radial passage

66 shoulder

A first door corner closing area

B second door corner closure zone

C third door corner closed area

D fourth door corner closed area

E first fluid path

Fsecond fluid path

G third fluid pathway

H fourth fluid path

Claims

1. Door closer (14) for a door leaf (10), wherein the door closer (14) has a closing hydraulic system (22) for setting a closing speed of the door leaf (10), wherein the closing hydraulic system (22) has:

a first fluid path (E) having a first fluid flow-regulating valve (36) through which a fluid flow flows during the closing of the door leaf (10) in a first corner closing region (A) of the door closer (14);

a second fluid path (F) having a first fluid flow control valve (36) and a second fluid flow control valve (38) through which a fluid flow flows during the closing of the door leaf (10) in a second door angle closing region (B) of the door closer (14), wherein a switchable closing speed change of the door closer (14) in the second door angle closing region (B) relative to the first door angle closing region (A) can be set by means of the second fluid flow control valve (38);

a third fluid path (G) having a third fluid flow-regulating valve (40), through which fluid flow flows during closure of the door leaf (10) within a third corner closure region (C) of the door closer (14); and/or

A fourth fluid path (H) having a fourth fluid flow-regulating valve (42), through which fluid flow flows during the closing of the door leaf (10) in a fourth door corner closing region (D) of the door closer (14),

wherein the third corner closure area (C) is connected to the first corner closure area (A) and the fourth corner closure area (D) is located within the third corner closure area (C).

2. The door closer (14) according to claim 1, wherein:

the second door corner closure zone (B) is located within the first door corner closure zone (A); and/or

In the second fluid path (F), the second fluid flow-regulating valve (38) is connected in series with the first fluid flow-regulating valve (36).

3. The door closer (14) according to claim 1 or 2, wherein:

the first door corner closure area (a) and the second door corner closure area (B) have a common starting point; and/or

The second door corner closure area (B) is smaller than the first door corner closure area (A).

4. The door closer (14) according to claim 1 or 2, wherein:

the closed hydraulic system (22) having a first pressure chamber (32) and a second pressure chamber (34);

the first fluid path (E) fluidly connects the first pressure chamber (32) and a second pressure chamber (34) within a section of the first gate angle closure area (A) that does not intersect the second gate angle closure area (B); and

the second fluid path (F) fluidly connects the first pressure chamber (32) and the second pressure chamber (34) within the second gate angle closing region (B).

5. The door closer (14) according to claim 1 or 2, wherein:

the closing speed of the door closer (14) in the first door angle closing region (A) and the second door angle closing region (B) can be set by means of the first fluid flow control valve (36).

6. The door closer (14) according to claim 1 or 2, wherein:

the first door angle closing region (A) begins in a region between a 180 ° closing angle and a 120 ° closing angle and/or ends in a region between a 30 ° closing angle and a 10 ° closing angle; and/or

The second door angle closing region (B) starts in a region between a 180 ° closing angle and a 120 ° closing angle and/or ends in a region between a 90 ° closing angle and a 60 ° closing angle.

7. The door closer (14) according to claim 1 or 2, wherein:

the first fluid path (E) and the second fluid path (F) have a common fluid path section disposed upstream of the first fluid flow-regulating valve (36).

8. The door closer (14) according to claim 1 or 2, wherein:

in the second fluid path (F), the second fluid flow-regulating valve (38) is disposed downstream of the first fluid flow-regulating valve (36).

9. The door closer (14) according to claim 1 or 2, wherein:

the third door angle closing region (C) begins in the region between the 30 ° closing angle and the 10 ° closing angle and/or ends at the 0 ° closing angle; and/or

The fourth door angle closing region (D) begins in the region between the 15 ° closing angle and the 5 ° closing angle and/or ends at the 0 ° closing angle.

10. The door closer (14) according to claim 1 or 2, wherein the closing hydraulic system (22) further has:

a housing having a plurality of through-holes (37, 39, 41, 43) in which the first, second, third and fourth fluid flow-regulating valves (36, 38, 40, 42) are accommodated, wherein the first, second, third and fourth fluid flow-regulating valves (36, 38, 40, 42) are configured such that the first, second, third and fourth fluid flow-regulating valves (36, 38, 40, 42) can be set from both end sides of the through-holes (37, 39, 41, 43), respectively.

11. The door closer (14) according to claim 1 or 2, wherein the closing hydraulic system (22) further has:

a rotatably supported closer shaft (26) having a cam plate (44);

a hydraulic piston (28) having a cam follower (46) that follows the cam plate (44); and

a housing (30) in which a hydraulic piston (28) is guided between a first pressure chamber (32) and a second pressure chamber (34).

12. The door closer (14) according to claim 11, wherein:

the first fluid path (E) having a first groove (54) in the hydraulic piston (28), the first groove (54) presetting the beginning and length of the first door angle closing region (A); and/or

The second fluid path (F) having a second groove (58) in the hydraulic piston (28) which presets the beginning and the length of the second gate angle closing region (B); and/or

The third fluid path (G) having a third groove (62) in the hydraulic piston (28) presetting the beginning and length of a third gate angle closing region (C); and/or

The fourth fluid path (H) has a shoulder (66) on the hydraulic piston (28) which presets the beginning of a fourth gate angle closing region (D).

13. The door closer (14) according to claim 11, wherein:

the first fluid path (E) having a first radial passage (56) in the hydraulic piston (28); and/or

The second fluid path (F) having a second radial passage (60) in the hydraulic piston (28); and/or

The third fluid path (G) having a third radial passage (64) in the hydraulic piston (28); and/or

The fourth fluid path (H) has no radial passages in the hydraulic piston (28).

14. The door closer (14) according to claim 1, wherein the door closer is a slide-rail door closer.