TWI801444B - door closer - Google Patents

Abstract

The invention relates to a door closer (14) for a door leaf (10), in particular a sliding door closer, wherein the door closer (14) has a closing hydraulic system (22) for adjusting the closing speed of the door leaf (10). The closing hydraulic system (22) comprises a first fluid path (E) with a first fluid flow-regulating valve (36), after the door leaf (10) closes in the first corner closing area (A) of the door closer (14) During this time, the fluid flow passes through the first fluid flow-regulating valve (36). The closing hydraulic system (22) comprises a second fluid path (F) having a first fluid flow-regulating valve (36) and a second fluid flow-regulating valve (38), between the door leaf (10) and the door closer (14) During closing in the second door angle closing area (B), the fluid flow flows through the first fluid flow-regulating valve (36) and the second fluid flow-regulating valve (38), wherein by means of the second fluid flow-regulating valve (38 ) can set a switchable closing speed change, especially a closing delay, of the door closer (14) in the second door corner closing area (B) relative to the first door angle closing area (A).

Description

door closer

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

A slide-rail door closer is known from EP 1 362 155 B1. The slide-rail door closer has a piston guided in a housing and supported on a closing spring, and a pinion mounted eccentrically and rotatably mounted on the housing and meshing with a toothed rack of the piston.

DE 20 2008 005 721 U1 discloses a door closer with a hydraulic closing delay. The door closer has a door closer shaft which can be coupled to the shutter leaf, which can rotate in at least one direction of rotation from the closed position and is connected to a travel cam disc supported in the housing. The stroke cam disk cooperates with at least one active element, which is connected to a hydraulic damping device and accommodated in an oil-squeezed hydraulic piston. The profile section of the stroke cam disk cooperating with the active element has a corner section, the angle of rotation of which with respect to the stroke cam disk causes an increased stroke of the hydraulic piston for increasing the oil pressure in order to realize the door leaf in this corner section. The delay of the closing movement on .

Furthermore, it is known to provide a door closer with a closing hydraulic system with a plurality of fluid paths with regulating valves for setting the closing speed of the door leaf in successive closing phases or in the closing area of the gate angle . The setting of the regulating valve must be implemented separately in the closing phase to prevent the impact of the door leaf. This can be error prone and time consuming.

It is therefore an object of the present invention to provide a door closer which enables a simple and rapid setting of the closing speed for several closing phases, ie the closing area of the door corner.

This object is achieved by a door closer. Advantageous refinements are also described here.

Door closers are in particular sliding door closers for door leaves. The door closer has a closing hydraulic system (eg 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 closing of the door leaf in the first corner closing region of the door closer, a fluid flow flows through the first fluid flow regulating 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 corner closing region of the door closer, a fluid flow flows through the first fluid flow-regulating valve and the second fluid-flow-regulating valve. By means of the second fluid flow regulating valve, a switchable change in the closing speed, in particular a closing delay, of the door closer in the second corner closing range relative to the first corner closing range can be set.

The common use of one control valve for both fluid paths and the use of a switchable second control valve for one of the fluid paths enables the variation of the closing speed of the door leaf to be selectively switchable via the second door corner closing area . Therefore, it is possible not to adjust the second regulating valve out of the initial position. Already by the setting of the first regulating valve, it is possible to prevent the impact of the door leaf in the closing area of the first and second door corners. The setting of the door closer can be performed more quickly and simply by not necessarily having to set the second regulating valve. If desired, an additional closing delay can be set in the second door corner closing range by means of the second control valve.

In particular, the first fluid path can have no second regulating valve.

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

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

In one embodiment, the first corner closure area and the second corner closure area have a common origin. Alternatively or additionally, the second corner closure area is smaller than the first corner closure area. However, it is thus also possible, for example, to provide a closing delay by means of the second door corner closing area in the section of the first door corner closing area.

In a further embodiment, the closed hydraulic system has a first pressure chamber and a second pressure chamber. The first fluid path fluidly connects the first pressure chamber and the second pressure chamber within a section of the first corner closure region that does not intersect the second corner closure region. The second fluid path fluidly connects the first and second pressure chambers to each other within the second door corner closure region. The setting of the first control valve thus acts for the first corner closing area and the second corner closing area contained therein. Conversely, the setting of the second regulating valve only has an effect on the closing area of the second door corner.

In particular, the first fluid path and the second fluid path can have a fluid connection between the first pressure chamber and the first fluid flow-regulating valve, wherein a first channel, in particular a hole (eg blind hole), forming this fluid connection. Preferably, the second fluid path has a fluid connection between the first fluid flow-regulating valve and the second fluid flow-regulating valve, through a second channel, in particular a hole (eg blind) in the housing of the door closer. hole), forming the fluid connection. Preferably, the first channel and the second channel can be arranged side by side.

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

In a preferred embodiment, said first door corner closure region starts in a region between a closure angle of 180° and a closure angle of 120° (for example at a closure angle of 180°, 125° or 110°) and/or It ends in the region between the 30° and 10° dwell angles, for example at 15°. Alternatively or additionally, the second door angle closure area starts in a region between a closure angle of 180° and a closure angle of 120° (eg at a closure angle of 125° or 120°) and/or closes at 90° Ends in the region between the angle of closure and the 60° closure angle (for example at a 70° closure angle). The switchable closing delay in the closing area of the second door corner can therefore, for example, provide sufficient time for luggage, baby carriages, hospital beds etc. to pass through the door without the door leaf having to be held firmly.

In particular, the door leaf closes at a closing angle of 0°.

It is possible that in a door angle closing area which is larger than the first door angle closing area, for example in the area between 180° closing angle and 125° or 120° closing angle, the closing for setting the closing speed of the door leaf The hydraulic system can fail. However, it is also possible for the closing hydraulic system to already function at, for example, a closing angle of 180° and/or for the first door closing area to start at a closing angle of 180°.

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

In one embodiment, the second fluid flow-regulating valve is arranged downstream of the first fluid flow-regulating valve in the second fluid path. It is thus ensured that a switchable throttling of a fluid flow already throttled by the first regulating valve is possible in the second fluid path by the second regulating valve. A switchable throttle 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. Fluid flow flows through the third fluid path (and third fluid flow-regulating valve) during closing of the door leaf in the third door corner closure region. Additionally, the closed hydraulic system may also include a fourth fluid path having a fourth fluid flow-regulating valve. Fluid flow flows through the fourth fluid path (and fourth fluid flow-regulating valve) during closing of the door leaf in the fourth door corner closure region. Therefore, additional door corner closing areas can be provided for the door closer in order to provide, for example, soft closing of the door and a quick end stop for securely closing the door.

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

In another embodiment, the third door angle closure region starts in a region between a closure angle of 30° and a closure angle of 10°, for example at a closure angle of 15° and/or ends at a closure angle of 0°. Alternatively or additionally, the fourth door angle closure region starts in a region between a closure angle of 15° and a closure angle of 5°, for example at a closure angle of 7° and/or ends at a closure angle of 0°. Thus, in the third corner closing range, a soft closing of the door leaf can be set, while in the fourth corner closing range, a faster closing speed can be set, so that the door leaf closes securely.

In one embodiment, the closed hydraulic system further includes a housing having a plurality of through holes. A fluid flow-regulating valve (eg, a first fluid flow-regulating valve, a second fluid flow-regulating valve, a third fluid flow-regulating valve, and/or a fourth fluid flow-regulating valve) is accommodated in the through hole. The fluid flow-regulating valve is arranged so that the fluid flow-regulating valve can be set from both end sides of the corresponding through hole respectively. This increases the possibilities for installing door closers.

Thus, the door closer can in particular be configured for leaf mounting on the hinge side of the door leaf, for frame top mounting on the hinge side of the door leaf, for frame top mounting on the opposite hinge side of the door leaf and for leaf mounting on the opposite hinge side of the door leaf.

In another embodiment, the closing hydraulic system further has: a rotatably supported closer shaft with a cam disc; a hydraulic piston with a cam follower (eg a roller) which follows the cam disc; and and/or a housing in which a hydraulic piston is guided between the first pressure chamber and the second pressure chamber.

In particular, the closer shaft can be connected to a linkage of the door closer for connection 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 start and/or the length of the first door corner closure area. Alternatively or additionally, the second fluid path has a second groove in the hydraulic piston which predetermines the start and/or the length of the second door corner closing area. Alternatively or additionally, the third fluid path has a third groove in the hydraulic piston, which predefines the start and/or the length of the third door corner closing area. Alternatively or additionally, the fourth fluid path has a shoulder on the hydraulic piston which presupposes the start of the fourth door corner closing area. Thus, the door corner closing area is preset by the movement of the hydraulic piston caused by the cam when pivoting the door leaf.

In another embodiment, said first fluid path has a first radial passage in said hydraulic piston, said second fluid path has a second radial passage in said hydraulic piston, said first The third fluid path has a third radial channel in the hydraulic piston and/or the fourth fluid path has no radial channel in the hydraulic piston.

10‧‧‧door leaf

12‧‧‧door hinge

14‧‧‧door closer

16‧‧‧Close body

18‧‧‧connecting rod

20‧‧‧sliding rail

22‧‧‧Close hydraulic system

24‧‧‧Open the hydraulic system

26‧‧‧closer shaft

28‧‧‧Hydraulic piston

30‧‧‧shell

32‧‧‧First pressure chamber

34‧‧‧Second pressure chamber

36‧‧‧The first fluid flow - regulating valve

37‧‧‧The first through hole

38‧‧‧Second fluid flow-regulating valve

39‧‧‧Second through hole

40‧‧‧Third fluid flow-regulating valve

41‧‧‧The third through hole

42‧‧‧Fourth fluid flow-regulating valve

43‧‧‧4th through hole

44‧‧‧Cam disc

46‧‧‧Cam follower

48‧‧‧Damping spring

50‧‧‧cover

52‧‧‧Safety valve

54‧‧‧The first slot

56‧‧‧The first radial channel

58‧‧‧The second slot

60‧‧‧The second radial channel

62‧‧‧The third slot

64‧‧‧The third radial channel

66‧‧‧shoulder

A‧‧‧closed area of the first door corner

B‧‧‧closed area of the second door corner

C‧‧‧closed area of third door corner

D‧‧‧closed area of the fourth door corner

E‧‧‧First fluid path

F‧‧‧Second fluid path

G‧‧‧The third fluid path

H‧‧‧Fourth fluid path

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. In the drawings: Figure 1 shows a schematic diagram of a door leaf which can be closed by means of a door closer in the closing area of a door angle of 180°; Figure 2 shows a schematic diagram of the closing area of the door closer; Figure 3 shows The cross-sectional view of the closer body of the door closer when the door leaf is closed (that is, the door closure angle is 0°); Figure 4 shows that the door leaf is closed at the beginning of the first and second door angle closure areas, for example, the door closure angle is about 125° °, the cross-sectional view of the closer body of the door closer; Figure 5 shows a cross-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 area, for example, when the door closing angle is about 70°; 6 shows a cross-sectional view of the closer body of the door closer when the door leaf closes at the end of the first door corner closing area and at the beginning of the third door corner closing area, for example when the door closing angle is about 15°; and FIG. 7 A cross-sectional view of the closer body of the door closer is shown when the door leaf is closing at the beginning of the fourth door angle closing area, for example at a door closing angle of about 7°.

In FIG. 1 , a view of a door leaf (door leaf) 10 is schematically shown from above. The door leaf 10 is pivotally connected to the door frame by one or more door hinges 12 . The door leaf 10 can be opened and closed in a region of approximately 180°. The closing behavior of the door leaf 10 can be set by means of the door closer 14 , especially when closing.

As shown in FIG. 1 , the door closer 14 can be configured, for example, as a so-called sliding door closer. The door closer 14 has a closer body 16 , a link 18 and a slide rail 20 . The modular structure 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 relative 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 closing angle of the door during closing of the door leaf 10 . In other words, during the closing process, the door leaf 10 can close quickly in certain angular regions and slowly in certain angular regions.

In FIG. 1 , four corner closure regions are schematically shown, for which different closure speeds and delays can be set by means of the closer body 16 . In particular, the closing hydraulics of the closer body 16 can be used to set the closing speed in the closing area A of the first door corner. Optionally, additionally in a second door corner closure area B located within the first door corner closure area A, a closing delay can be set. Following the first corner closure region A, a third corner closure region C can be set and within the third corner closure region C, a fourth corner closure region D can be set.

The closing hydraulics of the door closer 14 can be configured such that it acts already, for example, from 180°, or first from 125° or 120°. The first door corner closing area A can extend, for example, between 125° and 15°. In the first corner closing area A, a basic closing speed of the door leaf 10 can be set. The second door corner closing area B can extend, for example, between 125° and 70°. For example, the first and/or the second door corner closure area can also start earlier and/or end later. In the second corner closure area B, an additional delay can be set if required. Thus, for example, sufficient time can be provided for suitcases, prams, hospital beds etc. to pass through the door. The third door corner closure region C can extend, for example, between 15° and 0°. For example, the third door corner closing area C can be set such that the door leaf 10 can be closed almost silently. The fourth door corner closing area D can extend, for example, between 7° and 0°. Here, the speed at the final impact can be set so that it is ensured that the door leaf 10 is positively closed, eg under elastic deformation of the door seal.

The four door corner closing areas A to D are again shown schematically in the diagram of FIG. 2 . Here, it should be emphasized that the door closer 14 according to the invention can in particular only optionally set the second door corner closing area B. FIG. Without adjusting the second corner closing area B, the door leaf 10 can be closed at a uniform speed within the first corner closing area A. FIG. If desired, a second door corner closing area B can additionally be added as a closing delay. The basic setting of the door closer 14 can be carried out more easily and in particular faster by the only selectable closing delay in the second door corner closing area B.

In this case, it should also be emphasized that the door corner closure areas A and B influence each other. That is, the setting regarding the closing speed in the first door corner closing area A indicates the initial speed for delay in the second door corner closing area B. Specifically, a plurality of regulating valves are provided for setting four door corner closing areas A to D, as described in detail below with reference to the attached Figures 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 not described in detail here for influencing the opening behavior of the door leaf 10 .

The closing hydraulic system 22 has a closer shaft 26 , a hydraulic piston 28 , a housing 30 , a first pressure chamber (damping chamber) 32 and a second pressure chamber 34 . Additionally, closed hydraulic system 22 has four regulating valves 36, 38, 40 and 42 for regulating fluid flow.

The closer shaft 26 is connected with the slide rail 20 through the connecting rod 18 (see Fig. 1 ). The closer shaft 26 is rotatably supported in the housing 30 . The closer shaft 26 has a cam disc 44 . The cam disk 44 can be designed, for example, as a heart.

The hydraulic piston 28 is reciprocatably disposed in the housing 30 . The hydraulic piston 28 defines a first pressure chamber 32 and a second pressure chamber 34 . Movement of the hydraulic piston 28 changes the volumes of the first pressure chamber 32 and the second pressure chamber 34 . The hydraulic piston 28 has a cam follower 46 , such as a rotatable roller, for following the cam profile of the cam disc 44 . The hydraulic piston 28 is supported via a damping spring 48 on a cover 50 which is fastened to the housing 30 .

The hydraulic piston 28 has a safety valve (check valve) 52 . When the door is opened, the hydraulic piston 28 moves toward the closer shaft 26 (to the right in FIG. 3 ), the safety valve 52 opens, and fluid flows from the second pressure chamber 34 into the first pressure chamber 32 . As the door closes, the hydraulic piston 28 is moved by the cam disc 44 in a direction away from the closer shaft 26 (to the left in FIG. 3 ). Safety valve 52 is closed. Fluid flows from the first pressure chamber 32 into the second pressure chamber 34 via at least one of a plurality of fluid paths depending on the current door closure angle. By means of a targeted influence on 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-openings 37 , 39 , 41 , 43 in the housing 30 . For example, the first regulator valve 36 is provided in the first through hole 37 . Through holes 37 , 39 , 41 , 43 connect opposite longitudinal outer sides of the housing 30 of the closer body 16 . The control valves 36 , 38 , 40 , 42 can be adjusted 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) which connects the first pressure chamber 32 with the second pressure chamber 34 in the second door corner closure area B (see 1 and 2 Figs). The start point, width and end point of the second door corner closure area B are preset by the location and length of the second slot 58 in the hydraulic piston 28 . Via the second groove 58 , the fluid flow is guided by the first and second fluid flow control valves 36 , 38 into a radial channel 60 of the hydraulic piston 28 to the second pressure chamber 34 . In particular, the second fluid path F has a first fluid flow regulating valve 36 and a second fluid flow regulating valve 38 . In the second fluid path F, a first fluid flow-regulating valve 36 and a second fluid flow-regulating valve 38 are connected in series. A second fluid flow-regulating valve 38 is disposed downstream of the first fluid flow-regulating valve 36 .

Figure 5 shows the 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 corner closing area A which is not connected to the second corner closing area B intersects (see Figures 1 and 2). The start, width and end of the first corner closure area A are preset by the location and length of the first groove 54 in the hydraulic piston 28 . Via the first groove 54 , the fluid flow is guided by the first fluid flow regulating valve 36 into a first radial channel 56 of the hydraulic piston 28 to the second pressure chamber 34 . In particular, the first fluid path E has a first fluid flow regulating valve 36 . In contrast to the second fluid path F, the first fluid path E has no second fluid flow regulating valve 38 .

Thus, by setting the first fluid flow-regulating valve 36, the closing speed of the door leaf 10 in the first corner closing area A can be set. If the second fluid flow regulating valve 38 is not adjusted, the closing speed set by the first fluid flow regulating valve 36 is maintained in the second door angle closing region B through which the second fluid path F flows. The second fluid flow-regulating valve 38 does not restrict fluid flow in the initial position. However, the second fluid flow-regulating valve 38 can also be adjusted away from the initial position. An additional closing delay can then be set in the second door corner closing area B by adjusting the second fluid flow control valve 38 .

Figure 6 shows the third fluid path G in dashed lines. The third fluid path G connects the first pressure chamber 32 with the second pressure chamber 34 in the third door corner closure region C (see FIGS. 1 and 2 ). The fluid flow from the third fluid flow control valve 40 is conducted via the third groove 62 into a third radial channel 64 of the hydraulic piston 28 to the second pressure chamber 34 .

FIG. 7 shows the third fluid path G in dashed lines and the fourth fluid path H in dashed 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 corner closure region D (see FIGS. 1 and 2 ). The start, width and end of the third door corner closure area 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 fluid flow regulating valve 40 is bypassed (not flowed through). Fluid flow is directed from the fourth fluid flow-regulating valve 42 to the second pressure chamber 34 via the shoulder 66 .

The present invention is not limited to the preferred embodiments described above. On the contrary, various modifications and changes are possible, which also utilize the idea of the present invention and thus fall within the protection scope of the present invention. In particular, the present invention also claims subject-matter and features of dependent claims independently of the cited claims. In particular, the features of the dependent claims are also independent of all the features of claim 1 of the independent claim, and for example independent of the closed hydraulic system, the first fluid path, the second fluid of the claim 1 of the independent claim The characteristics of the path, the presence and configuration of the first regulating valve and/or the second regulating valve are disclosed.

16‧‧‧Close body

22‧‧‧Close hydraulic system

24‧‧‧Open the hydraulic system

26‧‧‧closer shaft

28‧‧‧Hydraulic piston

30‧‧‧shell

32‧‧‧First pressure chamber

34‧‧‧Second pressure chamber

36‧‧‧The first fluid flow - regulating valve

37‧‧‧The first through hole

38‧‧‧Second fluid flow-regulating valve

39‧‧‧Second through hole

40‧‧‧Third fluid flow-regulating valve

41‧‧‧The third through hole

42‧‧‧Fourth fluid flow-regulating valve

43‧‧‧4th through hole

44‧‧‧Cam disc

46‧‧‧Cam follower

48‧‧‧Damping spring

50‧‧‧cover

52‧‧‧Safety valve

54‧‧‧The first slot

56‧‧‧The first radial channel

58‧‧‧The second slot

60‧‧‧The second radial channel

62‧‧‧The third slot

64‧‧‧The third radial channel

66‧‧‧shoulder

F‧‧‧Second fluid path

Claims (9)

A door closer (14) for a door leaf (10), in particular a sliding door closer (14), wherein the door closer (14) has a closing hydraulic system (22) for setting the closing speed of the door leaf (10) , wherein the closed hydraulic system (22) has: a first fluid path (E), the first fluid path (E) has a first fluid flow-regulating valve (36), and the door leaf (10) is in the During closing in the first corner closing area (A) of the door closer (14), the fluid flow flows through the first fluid flow-regulating valve (36); and the second fluid path (F), the second A fluid path (F) having said first fluid flow-regulating valve (36) and a second fluid flow-regulating valve (38) at the second door angle of said door leaf (10) of said door closer (14) During closing in the closing area (B), fluid flow flows through said first fluid flow-regulating valve (36) and said second fluid flow-regulating valve (38), wherein by means of said second fluid flow-regulating valve (38) A switchable closing speed change, especially a closing delay, of the door closer (14) in the second door corner closing area (B) relative to the first door corner closing area (A) can be set, Wherein said first fluid path (E) and said second fluid path (F) have a common fluid path section arranged upstream of said first fluid flow-regulating valve (36), wherein in said second In the fluid path (F), the second fluid flow-regulating valve (38) is arranged downstream of the first fluid flow-regulating valve (36), wherein the closed hydraulic system (22) has: a third fluid path (G), said third fluid path (G) having a third fluid flow-regulating valve (40), in said door leaf (10) in said door closer (14) in a third door corner closing area (C ) during the closed period, the fluid flow flows through the third fluid flow-regulating valve (40); and the fourth fluid path (H), the fourth fluid path (H) has a fourth fluid flow-regulating valve (42 ), during the closing of the door leaf (10) in the fourth corner closing area (D) of the door closer (14), the fluid flow flows through the fourth fluid flow-regulating valve (42), wherein the Said closing hydraulic system (22) also has: a rotatably supported closer shaft (26), said closer shaft (26) having a cam disc (44); a hydraulic piston (28), said hydraulic piston (28) having a cam follower (46) which follows the cam plate (44); and a housing (30) in which the hydraulic piston (28) is guided between a first pressure chamber (32) and a second pressure chamber (34), wherein the first fluid path (E) having a first groove (54) in said hydraulic piston (28), said first groove (54) presupposing the beginning of said first door corner closure area (A); and said second a fluid path (F) having a second groove (58) in said hydraulic piston (28), said second groove (58) presetting the start and length of said second door corner closure area (B); and The third fluid path (G) has a third groove (62) in the hydraulic piston (28) which presets the start and length of a third door corner closure area (C) and said fourth fluid path (H) has a shoulder (66) on said hydraulic piston (28), said shoulder (66) presupposing the beginning of a fourth door corner closure area (D), wherein said first fluid path (E) has a first radial passage (56) in said hydraulic piston (28); and said second fluid path (F) has a first radial passage (56) in said hydraulic piston (28); second radial passage (60); and said third fluid path (G) has a third radial passage (64) in said hydraulic piston (28); and said fourth fluid path (H) does not There is a radial channel in the hydraulic piston (28). According to the door closer (14) described in item 1 of the patent scope of the application, wherein: the second door corner closing area (B) is located in the first door corner closing area (A); and/or in the first door corner closing area (A); In the two fluid paths (F), the second fluid flow-regulating valve (38) is connected in series with the first fluid flow-regulating valve (36). According to the door closer (14) described in item 1 or 2 of the patent scope of the application, wherein: the first door corner closing area (A) and the second door corner closing area (B) have a common starting point; and/ Or the second door corner closing area (B) is smaller than the first door corner closing area (A). The door closer (14) according to any one of the preceding claims, wherein: the closed hydraulic system (22) has a first pressure chamber (32) and a second pressure chamber (34); The first fluid path (E) connects the first pressure chamber (32) in a section of the first door corner closure area (A) that does not intersect the second door corner closure area (B). and said second pressure chamber (34) in fluid connection; and said second fluid path (F) connects said first pressure chamber (32) and said second pressure chamber (32) within said second door corner closure region (B) The two pressure chambers (34) are fluidly connected. According to the door closer (14) described in the patent scope 1 or 2 of the application, wherein: by means of the first fluid flow-regulating valve (36), the door closer (14) can be set in the first door corner closing area ( A) and the closing speed in the second door corner closing area (B). The door closer (14) according to claim 1 or 2, wherein: said first door corner closing area (A) starts in the area between 180° closing angle and 120° closing angle and/or at 30 and/or said second door angle closure region (B) starts in the region between 180° and 120° of closure angle and/or at 90° ° dwell angle and 60° dwell angle. According to the door closer (14) described in item 1 or 2 of the patent scope of the application, wherein: the third door corner closing area (C) is connected to the first door corner closing area (A), and the fourth A door corner closure area (D) is located within said third door corner closure area (C). The door closer (14) according to claim 1 or 2, wherein: said third door angle closing area (C) starts in the area between 30° closing angle and 10° closing angle and/or ends at 0° closure angle; and/or said fourth door angle closure region (D) starts in the region between 15° closure angle and 5° closure angle and/or ends at 0° closure angle. According to the door closer (14) described in the patent scope 1 or 2 of the application, wherein: the housing (30) has a plurality of through holes (37, 39, 41, 43), and the first fluid flow-regulating valve ( 36), the second fluid flow-regulating valve (38), the third fluid flow-regulating valve (40) and the fourth fluid flow-regulating valve (42) are accommodated in the through hole (37, 39, 41, 43), wherein said first fluid flow-regulating valve (36), said second fluid flow-regulating valve (38), said third fluid flow-regulating valve (40) and said The disposition of the 4th fluid stream-regulating valve (42), makes can respectively from corresponding The first fluid flow-regulating valve (36), the second fluid flow-regulating valve (38), the third fluid flow A flow-regulating valve (40) and said fourth fluid flow-regulating valve (42).

Images