GB2559675A

GB2559675A - Door closer

Info

Publication number: GB2559675A
Application number: GB1721033.7A
Authority: GB
Inventors: Worner Benjamin
Original assignee: Geze GmbH
Current assignee: Geze GmbH
Priority date: 2016-12-16
Filing date: 2017-12-15
Publication date: 2018-08-15
Anticipated expiration: 2037-12-15
Also published as: FR3060632B1; DE102016225329A1; GB2559675B; GB201721033D0; FR3060632A1; DE102016225329B4

Abstract

A door closer with hydraulic damping, which can be mounted in at least one position of installation, comprising a housing that has a piston chamber with piston and damping/pressureless chambers, the piston is moved in the direction of the damping chamber, and as a result hydraulic fluid flows from the damping chamber 19 into the pressureless chamber 21 via a flow channel arrangement 27. An outlet opening 39 39 for the hydraulic fluid and/or air from the damping chamber 19 is provided in the cover or insert 37 in the end of the damping chamber 19 for each position of installation of the door closer and is arranged at the top in relation to the piston chamber when installed, at least one further outlet opening (55 Fig 8) is also provided, wherein the sum of the centre paint angles of all outlet openings is at most 140°. The outlet 39 allows for any air trapped in the piston chamber to be moved from the damping chamber 19 to the pressureless chamber 21 which reduces the size of the drop back angle (when the piston cannot compress the air in the chamber). Preferably the size of the openings is less than 70°, various options are disclosed.

Description

(54) Title of the Invention: Door closer

Abstract Title: Hydraulic door closer with additional outlet located in end cover or insert (57) A door closer with hydraulic damping, which can be mounted in at least one position of installation, comprising a housing that has a piston chamber with piston and damping/pressureless chambers, the piston is moved in the direction of the damping chamber, and as a result hydraulic fluid flows from the damping chamber 19 into the pressureless chamber 21 via a flow channel arrangement 27. An outlet opening 39 39’ for the hydraulic fluid and/or air from the damping chamber 19 is provided in the cover or insert 37 in the end of the damping chamber 19 for each position of installation of the door closer and is arranged at the top in relation to the piston chamber when installed, at least one further outlet opening (55 Fig 8) is also provided, wherein the sum of the centre paint angles of all outlet openings is at most 140°. The outlet 39 allows for any air trapped in the piston chamber to be moved from the damping chamber 19 to the pressureless chamber 21 which reduces the size of the drop back angle (when the piston cannot compress the air in the chamber). Preferably the size of the openings is less than 70°, various options are disclosed.

11 39 Luft 25 15 13 21

29

39’ 31

Fig. 1

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2/5

Fig. 3

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Fig. 5

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Fig. 7

5/5 •-Luft

-----ΟΙ

Door closer

The present invention relates to a door closer with hydraulic damping, which is mountable in at least one position of installation, which in particular is predefined and/or intended, with a housing that has a piston chamber, a piston that is mounted in the piston chamber displaceably along a longitudinal direction and that is coupled to a closer shaft, by means of which piston the piston chamber is divided into a damping chamber and a pressureless chamber, which both are filled or fillable with a hydraulic fluid, in particular oil, and a flow channel arrangement, which is formed in the housing and connects the damping chamber and the pressureless chamber to one another, wherein, in the event of a closing operation, the piston is moved in the direction ofthe damping chamber, and as a result hydraulic fluid flows from the damping chamber into the pressureless chamber via the flow channel arrangement, whereby the closing operation is damped.

Door closers ofthe kind described above are generally known and provide for the automatic closing of a door. Here, a door closer is damped by means of a hydraulic system. Firstly, a manually or automatically induced rotary opening movement of the door is converted into a movement of the piston in the direction of the pressureless chamber, wherein a spring is pretensioned and is used as an energy accumulator. In order to close the door, the pretensioned spring presses on the piston. In order to displace the piston in the direction ofthe damping chamber and thus close the door, the hydraulic fluid, in particular oil, must flow from the damping chamber, pressurised by the spring, in front ofthe piston via the flow channel arrangement and into the pressureless chamber behind the piston. A throttle valve or a control valve is usually arranged in the flow channel arrangement and determines the damping of the closure of the door closer and in particular is adjustable.

Here, it is desirable that the damping chamber is free from air inclusions. If there is air present in the damping chamber, the air will firstly be compressed in the event of a closing operation. Since the piston does not experience any damping during the compression of the air, the door firstly drops back a few degrees in the closing direction after it has been opened, before the damping comes into effect. The associated angle is referred to as the drop-back angle. The drop-back angle should be kept as small as possible so as to guarantee a comfortable and safe use of the door. In practice however, when filling the door closer with the hydraulic fluid, air inclusions often remain.

It is known from DE 10 2014 212 357 B3 that the flow channel arrangement comprises a control channel that opens out into the damping chamber in an upper region in a predefined position of installation. Since any enclosed air collects at the top in the damping chamber, following assembly and prior to commissioning the enclosed air can be transferred, by in particular multiple actuation of the door closer, from the damping chamber into the pressureless chamber, where it can no longer cause the door to drop back and therefore no longer causes any interference. If a further control channel is formed in the housing in the lower region of the pressure chamber in the predefined position of installation, a corresponding transporting away of air can be ensured, even in the case of a door closer rotated through 180°. However, the costs associated with the drilling of the control channels in the housing are relatively high.

The object of the present application is to describe a door closer of the type defined in the introduction, which avoids the problem of the door dropping back on account of air enclosed in the damping chamber and which at the same time can be produced economically.

This object is achieved by a door closer having the features of claim 1, and in particular in that, in a closure element closing the damping chamber outwardly in a fluid-tight manner, in particular a cover, or in an insert inserted in a form-fitting manner optionally into the end of the damping chamber remote from the piston, an outlet opening for the hydraulic fluid and/or air from the damping chamber in fluid communication with an inlet opening of the flow channel arrangement is provided for each position of installation of the door closer and is arranged at the top in relation to the piston chamber in the particular position of installation, wherein at least one further outlet opening can be provided, wherein the sum of the centre point angles of all outlet openings is at most 140°.

With the door closer according to the invention it is therefore not necessary to provide control channels in the housing, and instead the air is transferred from the damping chamber into the pressureless chamber either via the closure element for the damping chamber provided anyway, in particular a cover, or via an additionally provided insert, which can be arranged in the region ofthe closure element and for example can be made of plastic. To this end, in the closure element or the optional insert, which can also be omitted, there is provided an outlet opening disposed in the upper region of the damping chamber for each predefined or intended position of installation of the door closer, which outlet opening, in particular in each case, is fluidically connected to the channel arrangement. The channel arrangement preferably comprises an outflow channel running in the longitudinal direction ofthe door closer.

A position of installation ofthe door closer is in particular an orientation ofthe door closer. One position of installation or two positions of installation can be provided. In principle, however, more than two predefined or intended positions of installation can also be provided. The centre point angle is also referred to as a central angle. In a cross-sectional view of the door closer perpendicular to the longitudinal direction ofthe door closer, the longitudinal direction ofthe door closer is represented by a centre point, and the corresponding outlet opening is delimited by two delimitation points. The centre point angle is the angle that is formed between a first connecting line from the centre point to the first delimitation point and a second connecting line from the centre point to the second delimitation point of a particular outlet opening. An inlet opening of the flow channel arrangement is an opening with which the flow channel arrangement opens out into the piston chamber. The flow channel arrangement preferably comprises precisely one inlet opening. In principle, however, a plurality of inlet openings can also be provided.

Besides the outlet openings, which are oriented upwardly in a predefined or intended position of installation and which will be referred to hereinafter as outlet openings each associated with a position of installation, one or more further outlet openings can be provided, which in a corresponding position of installation, however, are not oriented upwardly and will be referred to hereinafter as further outlet openings. The provision of one or more further outlet openings, however, is optional, i.e. these can also be omitted, in particular are preferably omitted.

Since the sum of the centre point angles of all outlet openings, i.e. including the centre point angle of one or more further outlet openings, if provided, is at most 140°, i.e. the proportion of outlet openings over the entire periphery is much less than 50% (= 180°), an at least practically complete flow of air enclosed in the damping chamber via the flow channel arrangement into the pressureless chamber can be achieved. Here, the volume flow rate of the hydraulic fluid is such that flow speeds and pressure distributions are set, which can ensure a reliable transfer of the enclosed air into the pressureless chamber. In particular, a sufficient suction effect can thus be generated in order to transport the enclosed air away from the top towards the bottom. Transporting the air away towards the bottom is necessary in particular if the flow channel arrangement or at least part thereof is arranged in the particular position of installation further downwardly than the outlet opening. With two outlet openings, which are arranged opposite one another with respect to the longitudinal direction and which are each arranged towards the top in a predefined or intended position of installation, this is the case for at least one of the two outlet openings. With higher proportions this is not possible, or is only possible to an insufficient extent. For the case that only precisely one outlet opening is provided, which is then an outlet opening associated with a position of installation, the sum of the centre point angles consists merely of a summand, specifically the centre point angle of the precisely one outlet opening.

The centre point angle of the particular outlet opening is preferably at most 70°. With two outlet openings the sum of the centre point angles is then in turn at most 140°. If, for example, four outlet openings are provided, the centre point angle of the respective outlet opening is preferably at most 35°. The sum of the centre point angles of all outlet openings is preferably at most 70°, preferably at most 35°, and/or the centre point angle of the respective outlet opening is at most 35°, preferably at most 20°. At these values, air enclosed in the damping chamber can be transferred more quickly into the pressureless chamber, in particular with a smaller number of actuations of the door closer prior to commissioning.

In accordance with a development of the invention, just one outlet opening is provided for each position of installation, i.e. no further outlet openings are provided. On the whole, at most four outlet openings can be provided, in particular two outlet openings each associated with a predefined or intended position of installation and two further outlet openings. In principle, however, another number of outlet openings is also possible.

In particular, precisely two positions of installation can be provided, and their associated outlet openings are arranged opposite one another with respect to the longitudinal direction. With two positions of installation of this kind, the door closer for example can be assembled as an upper door closer or optionally as a floorlevel door closer, or a choice can be made between assembly on a door panel or assembly at the top of a door, or between assembly on a hinge side or a stop side of a door, or between assembly on a door hinged on the left or right side.

The two outlet openings are preferably fluidically connected by means of at least one connecting channel to the same inlet opening of the flow channel arrangement and/or to one another. The number of channels of the flow channel arrangement can thus be kept low. If the inlet opening of the flow channel arrangement is arranged at the bottom, the enclosed air can be transported away from the top towards the bottom through the connecting channel.

The inlet opening can be arranged in the vertical direction between the two outlet openings. The inlet opening can be arranged centrally or eccentrically between the two outlet openings. In accordance with another development, the inlet opening can be arranged level with one of the two outlet openings.

In accordance with a development, the insert is formed as a disc-shaped element, which is fitted into the piston chamber, wherein the connecting channel is formed by a groove formed on the outer periphery of the insert and by the inner wall of the piston chamber. However, the closure element can also have a cylindrical extension, which engages in the piston chamber in a fluid-tight manner, wherein the connecting channel is formed by a groove formed on the outer periphery of the extension and by the inner wall of the piston chamber. Or, the insert and the closure element abut one another in a fluid-tight manner, wherein an outer groove is formed in the contact region between the insert and the closure element, wherein the connecting channel is formed by the outer groove and the inner wall of the piston chamber.

The connecting channel can also be formed as a passage, in particular a straight passage, in the insert formed in particular as a disc-shaped element or in the closure element, or the insert can be formed as a pipe-like element and the connecting channel can be formed by the pipe interior.

The closure element and/or the insert can be provided with a filter element for cleaning the hydraulic fluid flowing into the flow channel arrangement. This is advantageous in particular if the hydraulic fluid has become contaminated, for example by abrasion during the movement of the piston in the piston chamber. By means of the filter element, a throttle valve usually arranged in the flow channel arrangement can be protected against potential contamination, so that the functionality of the throttle valve is not limited.

For example, the filter element can be disc-shaped and can be inserted into a filter receptacle of the insert. The filter receptacle can be formed here by a peripheral, outer annular web formed on a base of the insert, wherein the particular outlet opening passes through the base of the insert in the longitudinal direction, and wherein a radial opening passing through the annular web is provided for each position of installation of the door closer.

Developments of the invention are also specified in the dependent claims, the description, and in the drawings.

Non-limiting exemplary embodiments of the invention are illustrated in the drawings and are described below.

The drawings show, in each case in a schematic depiction,

Fig. 1 a door closer according to the invention in accordance with a first embodiment,

Fig. 2 a door closer according to the invention in accordance with a second embodiment,

Fig. 3 a door closer according to the invention in accordance with a third embodiment,

Fig. 4 a door closer according to the invention in accordance with a fourth embodiment,

Fig. 5 a door closer according to the invention in accordance with a fifth embodiment,

Fig. 6 a door closer according to the invention in accordance with a sixth embodiment,

Fig. 7 a door closer according to the invention in accordance with a seventh embodiment, and

Fig. 8 a cross-sectional view of a door closer according to the invention with a closure element or insert having four outlet openings.

Fig. 1 shows, in a longitudinal section, a detail of a door closer housing 11 of a hydraulic door closer that can be mounted on a door in accordance with a first embodiment. A piston chamber 13 filled with a hydraulic fluid, in particular oil, is formed in the door closer housing 11, with a piston 15 mounted in said piston chamber displaceably along a longitudinal direction 17. The piston chamber 13 is divided by the piston 15 into a damping chamber 19 and a pressureless chamber 21, through which a piston rod 23 connected to the piston 15 extends. The piston rod 23 is connected via a gearing mechanism, for example a rack and pinion gearing unit, to a closer shaft (not shown) of the door closer. A spring (not shown) applying pressure to the piston 15 is arranged in the pressureless chamber 21.

When opening the door, the rotary opening movement of the door is converted by means of the aforesaid closer shaft and the piston rod 23 into a linear movement of the piston 15. More specifically, the piston 15 is displaced in the direction of the presureless chamber 21, wherein, for volume compensation, hydraulic fluid flows from the pressureless chamber 21 into the damping chamber 19 via a check valve 25 formed in the piston 15. Here, the aforesaid spring is pretensioned so that the energy stored hereby can be used to close the door. When closing the door, the piston 15 moves in the direction of the damping chamber 19, wherein hydraulic fluid flows back from the damping chamber 19 into the pressureless chamber 21 via a flow channel arrangement 27 that is formed in the housing 11 and that fluidically connects the damping chamber 19 and the pressureless chamber 21. In the flow channel arrangement 27, of which an outflow bore 29 extending radially to the longitudinal direction 17 and an outflow bore 31 extending in the longitudinal direction 17 are shown, there is arranged an adjustable throttle valve, which determines the damping ofthe closure ofthe hydraulic door closer. The outflow opening 29 opens out here via an inlet opening 33 into the damping chamber 19.

The door closer shown in Fig. 1 can be mounted in precisely two different intended positions of installation. The first position of installation, in which the inlet opening 33 is arranged in the lower region ofthe piston chamber 13 and the two outflow bores 29, 31 are arranged in the lower region ofthe housing 11, is shown in Fig. 1. The second position of installation (not shown) is rotated about the longitudinal direction 17 through 180° relative to the first position of installation shown in Fig. 1, as is provided for example for elective assembly of the door closer on a door panel or overhead on a door frame.

When filling the piston chamber 13 with the hydraulic fluid, a certain amount of air can become enclosed in the damping chamber 19. This is undesirable, however, since, in the event of a closing operation, air inclusions cause the door firstly to drop back a few degrees undamped, before the hydraulic damping comes into effect. So as to be able to remove the enclosed air, which collects at the top in the damping chamber 19, from the damping chamber 19, a disc-shaped insert 37 made of plastic is inserted in a form-fitting manner in the damping chamber 19 directly before a cover 35, which closes the damping chamber 19 outwardly in a fluid-tight manner and for example is illustrated in conjunction with the embodiment according to Fig. 4. The insert 37 is also shown individually on the right in Fig. 1.

The insert 37, at its top end, has, centrally, an outlet opening 39 associated with the first position of installation for the hydraulic fluid and the enclosed air. The associated outlet opening 39, via a connecting channel 41 running perpendicularly downwards in the form of a passage in the insert 35, is fluidically connected to the inlet opening 33 arranged at the lower end of the insert 35 and thus to the flow channel arrangement 27 formed in the lower region of the housing 11, so that, by multiple successive actuation of the door closer, - in spite of the fact that the inlet opening 33 and the flow channel arrangement 27 are arranged at the bottom, the enclosed air can be transferred over this path illustrated by arrows, into the pressureless chamber 21, where it no longer negatively influences the closure damping.

In addition, an associated outlet opening 39' is also provided at the lower end of the insert 35 and thus level with the inlet opening 33, which outlet opening is arranged opposite the associated outlet opening 39 with respect to the longitudinal direction 17 and is associated with the second position of installation,

i.e. which is arranged at the top in the second position of installation, i.e. in the case of a door closer rotated through 180° about the longitudinal direction 17 relative to Fig. 1. The associated outlet opening 39' likewise opens out into the connecting channel 41 and is thus connected to the (same) inlet opening 33. The two outlet openings 39, 39' each associated with a position of installation are also connected to one another via the connecting channel 41. In the second position of installation, air enclosed in the damping chamber 19 can be transported away readily through the flow channel arrangement 27 arranged at the top with the associated inlet opening 33.

In the case of the door closer according to Fig. 2 the connecting channel 41 is formed by a groove 57 formed on the outer periphery of the insert 37 (on the right in the individual depiction) and by the inner wall of the piston chamber 13, in particular of the damping chamber 19. The hydraulic fluid and any enclosed air are transported in this embodiment in the groove 57 along a circular path (cf. the corresponding arrows) to the inlet opening 33 of the flow channel arrangement 27 and through said flow channel arrangement into the pressureless chamber 21. As can be seen from Fig. 2, in this embodiment the inlet opening 33 is arranged eccentrically in the vertical direction between the two associated outlet openings 39, 39'. In principle, the inlet opening 33 and the flow channel arrangement 27 can be provided at any point in the peripheral direction.

The disc-shaped insert 37 shown in Fig. 2 can also be provided with an in particular disc-shaped filter 45 for cleaning the hydraulic fluid flowing into the flow channel arrangement (of. Fig. 3). A throttle valve arranged in the flow channel arrangement can be protected hereby for example against contamination occurring on account of abrasion as the piston 15 moves in the piston chamber

13. To this end the insert 37 can have a filter receptacle 47, into which the filter 45 is inserted. The filter receptacle 47 is formed by a peripheral outer annular web 51 formed on a base 49 of the insert 37. The two associated outlet openings 39, 39' pass here through the base 49 of the insert 37, in each case in the longitudinal direction 17, and each of the two associated outlet openings 39, 39' is associated with a radial opening 53, 53' in each case passing through the annular web 51.

In addition, the connecting channel 41 can also be provided in the form of a groove at another point. For example, the insert 37 and the cover 37 can abut one another in a fluid-tight manner, wherein the groove 57 is formed as an outer groove in the contact region between the insert 37 and the cover 35, as is depicted in Fig. 4. Or, the cover 35 can have a cylindrical extension 43, which engages in a fluid-tight manner in the piston chamber 13. The groove 57 can then be formed on the outer periphery of the extension 43 of the cover 35, as is depicted in Fig. 5.

In accordance with a further embodiment, the connecting channel 41 - as in Fig. 1 - can be formed as a straight passage, in particular centrally, in the cover 35 (see Fig. 6). Furthermore, an embodiment in which the insert 37 is formed as a pipe and the connecting channel is formed by the interior of the pipe is conceivable (cf. Fig. 7). In this case the two associated outlet openings 39, 39' can be formed as slotted pipe ends.

In principle it is also possible that one or more further outlet openings are provided, which are not associated with any position of installation, such that they are oriented upwardly in the corresponding predefined or intended position of installation. In this regard, two further outlet openings 55, 55' are arranged beside the two associated outlet openings 39, 39' in Fig. 8.

It is essential for the invention that the sum of the centre point angles a of all outlet openings 39, 39', 55, 55' is at most 140°, i.e. the proportion of outlet openings 39, 39', 55, 55' over the entire periphery of the piston chamber 13 or damping chamber 19 is much smaller than 50%. It can thus be ensured that a sufficient suction effect can be generated, so as to also transport enclosed air, which collects at the top in the damping chamber 19, away from the top and towards the bottom in an appropriate position of installation of the door closer. Generally, flow conditions and pressure conditions can thus be achieved, which enable a reliable transfer of enclosed air from the damping chamber 19 into the pressureless chamber 21. This effect can be achieved in a particular manner if the sum of the centre point angles is at most 70°, preferably at most 35°, and/or if the centre point angle a of the respective outlet openings 39, 39', 55, 55' is at most 70°, preferably at most 35°, preferably at most 20°.

The door closer according to the present invention makes it possible to reliably transport air enclosed in the damping chamber to the pressureless chamber so as to avoid the problem of the door dropping back. At the same time, the door closer can be produced economically.

Reference sign list

Housing

Piston chamber Piston

Longitudinal direction Damping chamber Pressureless chamber Piston rod Check valve

Flow channel arrangement

Outflow bore

Inlet opening

Cover

Insert

Associated outlet opening Associated outlet opening Connecting channel Cylindrical extension Filter

Filter receptacle Base

Annular web

Radial opening Radial opening Further outlet opening Further outlet opening Groove

Centre point angle

Claims

Patent Claims

1. A door closer with hydraulic damping, which is mountable in at least one position of installation, with a housing (11) having a piston chamber (13), a piston (15) that is mounted in the piston chamber (13) displaceably along a longitudinal direction (17) and that is coupled to a closer shaft, by means of which piston the piston chamber (13) is divided into a damping chamber (19) and a pressureless chamber (21), which both are filled or fillable with a hydraulic fluid, and a flow channel arrangement (27), which is formed in the housing (11) and connects the damping chamber (19) and the pressureless chamber (21) to one another, wherein, in the event of a closing process, the piston (15) is moved in the direction ofthe damping chamber (19), and as a result hydraulic fluid flows from the damping chamber (19) into the pressureless chamber (21) via the flow channel arrangement (27), whereby the closing operation is damped, characterized in that in a closure element (35) closing the damping chamber (19) outwardly in a fluid-tight manner, in particular a cover, or in an insert (37) inserted in a form-fitting manner optionally into the end of the damping chamber (19) remote from the piston (15), an outlet opening (39, 39') for the hydraulic fluid and/or air from the damping chamber (19) in fluid communication with an inlet opening (33) of the flow channel arrangement (27) is provided for each position of installation of the door closer and is arranged at the top in relation to the piston chamber (13) in the particular position of installation, wherein at least one further outlet opening (55, 55') can be provided, wherein the sum of the centre point angles (a) of all outlet openings (39, 39', 55, 55') is at most 140°.

2. The door closer according to claim 1, characterized in that the centre point angle (a) of each outlet opening (39, 39', 55, 55') is at most 70°.

3. The door closer according to claim 1 or 2, characterized in that the sum of the centre point angles (a) of all outlet openings (39, 39', 55,

55') is at most 70°, preferably at most 35°, and/or the centre point angle (a) of each outlet opening (39, 39', 55, 55') is at most 35°, preferably at most 20°.

4. The door closer according to at least one of the preceding claims, characterized in that an outlet opening (39, 39') is provided merely for each position of installation and/or in total at most four outlet openings (39, 39', 55, 55') are provided.

5. The door closer according to at least one of the preceding claims, characterized in that two positions of installation are provided, and their associated outlet openings (39, 39') are arranged opposite one another with respect to the longitudinal direction (17).

6. The door closer according to claim 5, characterized in that the two outlet openings (39, 39') are fluidically connected to the same inlet opening (33) of the flow channel arrangement (27), and/or are fluidically connected to one another, via at least one connecting channel (41).

7. The door closer according to claim 5 or 6, characterized in that the inlet opening (33) is arranged in the vertical direction between the two outlet openings (39, 39') and/or level with one of the two outlet openings (39, 39').

8. The door closer according to claim 6 or 7, characterized in that the insert (37) is formed as a disc-shaped element, which is fitted into the piston chamber (13), wherein the connecting channel (41) is formed by a groove (57) formed on the outer periphery of the insert (37) and by the inner wall of the piston chamber (13), and/or the closure element (35) has a cylindrical extension (43), which engages in the piston chamber (13) in a fluid-tight manner, wherein the connecting channel (41) is formed by a groove (57) formed on the outer periphery of the extension (43) and by the inner wall of the piston chamber (13), and/or the insert (37) and the closure element (35) abut one another in a fluid-tight manner, wherein an outer groove (57) is formed in the contact region between the insert (37) and the closure element (35), wherein the connecting channel (41) is formed by the outer groove (57) and the inner wall of the piston chamber (13).

9. The door closer according to claim 6 or 7, characterized in that the connecting channel (41) is formed as a passage in the insert (37), which in particular is formed as a disc-shaped element, or in the closure element (35).

10. The door closer according to claim 6 or 7, characterized in that the insert (37) is formed as a pipe-like element and the connecting channel (41) is formed by the pipe interior.

11. The door closer according to at least one of the preceding claims, characterized in that the closure element (35) and/or the insert (37) are/is provided with a filter element (45) for cleaning the hydraulic fluid flowing into the flow channel arrangement (27).

12. The door closer according to claim 11, characterized in that the filter element (45) is formed disc-shaped and is inserted into a filter receptacle (47) of the insert (37).

13. The door closer according to claim 12, characterized in that the filter receptacle (47) is formed by a peripheral outer annular web (51) formed on a base (49) of the insert (37), wherein the corresponding outlet opening (39, 39') passes through the base (49) of the insert (37) in the longitudinal direction, and wherein a radial opening (53) passing through the annular web (51) is provided for each position of installation of the door closer.

GB1721033.7

1-13

Intellectual

Property

Office

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