EP2921627B1 - Door closer - Google Patents

Description

• mit einem Türschließergehäuse, das eine Gehäuseachse aufweist,
• mit einer Schließerwelle, die an dem Türschließergehäuse um eine quer zu der Gehäuseachse verlaufende Wellendrehachse drehbar gelagert ist und die im Innern des Türschließergehäuses mit einer Hubkurvenscheibe versehen ist, die ihrerseits eine sich längs der Wellendrehachse erstreckende Steuerfläche aufweist,
• mit einem Antriebskolben, der in dem Türschließergehäuse längs der Gehäuseachse an einer Seite der Schließerwelle angeordnet und an dem Türschließergehäuse längs der Gehäuseachse beweglich geführt ist,
• mit einem Schließkrafterzeuger, welcher den Antriebskolben längs der Gehäuseachse in Richtung auf die Schließerwelle kraftbeaufschlagt, wobei der von dem Schließkrafterzeuger kraftbeaufschlagte Antriebskolben mit einer zu der Wellendrehachse der Schließerwelle hin gerichteten Antriebskolben-Schließbewegung längs der Gehäuseachse bewegbar und dabei an der Steuerfläche der Hubkurvenscheibe der Schließerwelle abgestützt ist,
• mit einem Dämpfungskolben, der in dem Türschließergehäuse an der von dem Antriebskolben abliegenden Seite der Schließerwelle angeordnet ist und der an dem Türschließergehäuse längs der Gehäuseachse beweglich geführt ist, wobei der Dämpfungskolben aufgrund der Antriebskolben-Schließbewegung gegen die Wirkung einer die Antriebskolben-Schließbewegung verzögernden Gegenkraft mit einer Dämpfungskolben-Schließbewegung antreibbar ist sowie
• mit einem Zwischenteil der sich zwischen dem Antriebskolben und dem Dämpfungskolben längs der Gehäuseachse an der Schließerwelle entlang erstreckt.

The invention relates to a door closer

• with a door closer housing that has a housing axis,
• with a closer shaft which is rotatably mounted on the door closer housing about a shaft axis of rotation running transversely to the housing axis and which is provided in the interior of the door closer housing with a cam disk which in turn has a control surface extending along the shaft axis of rotation,
• with a drive piston which is arranged in the door closer housing along the housing axis on one side of the closer shaft and is movably guided on the door closer housing along the housing axis,
• with a closing force generator which applies force to the drive piston along the housing axis in the direction of the closer shaft, the drive piston acted upon by the closing force generator being movable along the housing axis with a drive piston closing movement directed towards the axis of rotation of the closer shaft and supported on the control surface of the cam disc of the closing shaft is
• with a damping piston, which is arranged in the door closer housing on the side of the closer shaft remote from the drive piston and which is movably guided on the door closer housing along the housing axis, the damping piston due to the drive piston closing movement against the effect of a counterforce delaying the drive piston closing movement a damping piston closing movement can be driven and
• with an intermediate part which extends between the drive piston and the damping piston along the housing axis on the closer shaft.

A door closer of the above type is disclosed in US Pat DE 10 2010 022 047 A1 . On the previously known door closer, a drive piston and a damping piston of a piston assembly are arranged along a housing axis on both sides of a closer shaft. The closer shaft is rotatable about a shaft rotation axis running perpendicular to the housing axis and is provided with a cam disc. Starting from the drive piston, four tie rods extend longitudinally the housing axis to the damping piston. The tie rods are firmly connected to the drive piston by screw connections. On the side of the damping piston, the tie rods each protrude into a through-hole of the damping piston. A spring tensioning nut is screwed onto the end of each of the tie rods on the damping piston side. A lash adjuster spring is preloaded on two of the tie rods between the spring tension nuts forming an outer collar of the tie rods on the one hand and shoulders of the damping piston on the other. The lash adjuster springs are designed as helical springs and pushed onto the associated tie rods. The pretensioned lash adjuster springs put a tension on the tie rods in question, thereby causing the damping piston and the drive piston to be pulled against each other along the housing axis. As a result, the damping piston and the drive piston are over on opposite sides of the closer shaft. Cam rollers preloaded against the cam disc of the closer shaft. This ensures that the damping piston and the drive piston are supported on the cam disk without play via the cam rollers along the housing axis.

A door provided with the piston assembly executes a closing movement starting from an open position because the drive piston moves under the action of a relaxing closer spring with a drive piston closing movement in the direction of the shaft rotation axis and thereby acts on the cam disc of the closer shaft via the assigned cam roller and the Closer shaft set in rotation. During the drive piston closing movement, on the one hand the drive piston and the cam roller assigned to it and on the other hand the damping piston and the cam roller assigned to it are applied to the cam disk of the closer shaft without play by means of the preloaded lash adjuster springs. This is achieved in that the tension rods firmly connected to the drive piston are acted upon by the lash adjuster springs acting as compression springs in the direction of the damping piston, without their damping piston-side end faces being supported on the damping piston. If the tie rods were to be supported with their damping piston-side end faces on the damping piston, then along the housing axis would be mutually directed and for maintaining the play-free contact of the cam rollers on the cam disc indispensable compensatory relative movements of the damping piston and the drive piston impossible.

Further prior art is disclosed in US Pat DE 10 2004 041 358 A1 . This publication relates to a door closer with a hollow-cylindrical door closer housing on which a closer shaft provided with a cam disk is rotatably mounted about a shaft rotation axis. On one side of the closer shaft, a spring piston, which is acted upon by a closer spring on its side remote from the closer shaft, is movable along the housing axis of the door closer housing. The spring piston acted upon by the closer spring is supported on the cam disk of the closer shaft via a first force transmission roller. On the opposite side of the closer shaft, the door closer housing guides a damping piston along the housing axis, which is provided with a second power transmission roller. On the side of the damping piston that is remote from the closer shaft, a compression spring is arranged, which ensures that the damping piston is always in contact with the cam disk of the closer shaft via the second force transmission roller. A cylinder space for a hydraulic damping medium is formed between the damping piston and a housing cover of the door closer housing which delimits the door closer housing on the side of the damping piston remote from the closer shaft. If the door leaf provided with the door closer is opened, the closer shaft is set in rotation by means of a linkage which creates a connection between the door leaf and a stationary door frame. Due to the rotation of the closer shaft, the cam disk attached to the closer shaft drives the spring piston supported on the cam disk against the action of a restoring force exerted by the closer spring along the housing axis of the door closer housing with a spring piston opening movement. When the door leaf is opened, the damping piston acted upon by the compression spring is mounted on the lifting cam of the rotating closer shaft via the second power transmission roller. As a result of the spring piston opening movement, the closer spring is pretensioned. As a result, the closing force builds up on the closer spring, which is released when the door leaf closes automatically following the opening. For the automatic closing of the door leaf, the cam on the closer shaft is driven by the closer spring via the spring piston executing a spring piston closing movement and the spring piston between the spring piston and the first power transmission roller provided on the cam disk is applied with the closing force. As a result of the application of force to the lifting cam, the closer shaft executes a rotary movement which is converted into a closing movement of the door via the linkage provided between the door leaf and the fixed door frame. During the rotary movement carried out for the automatic closing of the door leaf, the closer shaft with the cam disc acts on the second power transmission roller on the damping piston. As a result, the damping piston is driven in the same direction as the spring piston executing a closing movement along the housing axis of the door closer housing with a damping piston closing movement directed away from the shaft rotation axis of the closer shaft. The damping piston displaces the hydraulic damping medium that is present in the cylinder space in front of the damping piston moving away from the shaft rotation axis. This delays the closing movement of the damping piston and, via the closer shaft, also the closing movement of the spring piston. Since not only the portion of the force exerted by the closer spring that is required for the automatic closing of the door leaf but also the forces associated with the damping of the spring piston closing movement must be transmitted via the closer shaft, the closer shaft including the cam disc provided on it is subjected to a high load. This is associated with heavy wear and tear on the door closer components that are switched into the power flow and a certain degree of sluggishness on the part of the known door closer during the closing movement of the door leaf equipped with the door closer.

The object of the present invention is to remedy the described disadvantages of the prior art.

This object is achieved according to the invention by the door closer according to patent claim 1.

In the case of the invention, an intermediate part extending along the housing axis of the door closer housing on the closer shaft is provided between the drive piston and the damping piston, by means of which the drive piston is supported on the damping piston during the closing movement of the drive piston in the direction of movement and thereby the damping piston with the damping piston. Closing movement drives. According to the invention, the portion of the force exerted by the closing force generator, for example a closer spring, attributable to the damping piston closing movement is not dissipated via the closer shaft and its cam disc but rather via the intermediate part provided between the drive piston and the damping piston. The power transmission to the damping piston thus takes place largely by bypassing the closer shaft and the cam disc and possibly also by bypassing a power transmission roller mounted on the damping piston. This relieves the load on the door closer components mentioned considerably and is consequently only subject to relatively little wear during door closer operation. In addition, the power transmission realized in the case of the invention between the drive piston and the damping piston causes a smooth closing movement of the door leaf equipped with the door closer from the rotatably open to the closed position. Because of this fact, the door closer according to the invention is particularly suitable as a free-swing door closer. If the automatic closing function of the free-swing door closer according to the invention is switched off, the user only has to exert a relatively small force on the door leaf to move the door leaf from the open to the closed position.

The intermediate part between the drive piston and the damping piston of the door closer according to the invention must be able to transmit compressive forces. In addition, it must allow the closer shaft and the cam disc to be accommodated in the space between the drive piston and the damping piston. It can be manufactured in one piece with the drive piston and the damping piston but also as a component separate from the drive piston and / or from the damping piston.

Special embodiments of the door closer according to claim 1 result from the dependent claims 2 to 15.

In the interest of the most symmetrical power transmission possible between the drive piston and the damping piston, it is provided in the case of the inventive design according to claim 2 that the intermediate part between the drive piston and the damping piston extends along both sides of the closer shaft,

Particularly favorable conditions in the power transmission arise on the door closer according to the invention according to claim 3. In this type of door closer, the intermediate part between the drive piston and the damping piston is preferably divided into four intermediate part elements. A pair of intermediate part elements is arranged on each side of the closer shaft, the intermediate part elements of each pair being spaced apart from one another along the housing axis. In this way, with little use of material, the drive piston is supported over a large area on the damping piston. Owing to the large-area support, in particular tilting movements of the damping piston and an associated increase in the friction between the damping piston and the wall of the door closer housing guiding it are avoided.

According to claim 4, in a further preferred embodiment of the invention, the cam disc of the closer shaft is arranged in the axial space of at least one of the pairs of intermediate sub-elements. The axial intermediate space between the pair or pairs of intermediate part elements offers sufficient installation space to accommodate the cam disk, which usually has a relatively large extension in the radial direction of the shaft rotation axis of the closer shaft.

The door closer according to the invention according to claim 5 is characterized by particular ease of assembly. After the connection between the drive piston and the damping piston has been loosened, the space between the drive piston and the damping piston is accessible. In particular, there is When the connection between the drive piston and the damping piston is released, it is possible to install the closer shaft with the cam disc in the space between the drive piston and the damping piston.

In principle, the intermediate part of the door closer according to the invention can be present as a component separate from the drive piston and the damping piston. According to claim 6, an intermediate part is preferred according to the invention which, as a piston extension, forms a structural unit with the drive piston and / or the damping piston. The piston extension can be manufactured in one piece with the piston in question. A two-piece design of the unit comprising piston and piston extension is also conceivable.

In the case of the inventive design according to claim 7, the intermediate part between the drive piston and the damping piston is also advantageously used to guide the piston arrangement on the door closer housing.

According to patent claim 8, in a further advantageous embodiment of the invention, the drive piston is tiltable relative to the door closer housing and the damping piston. The intermediate part between the drive piston and the damping piston allows tilting movements of the drive piston in a tilting plane running along the housing axis and along the shaft rotation axis of the closer shaft. As a result, the drive piston can, if necessary, be aligned in the tilting plane with respect to the door closer housing and other door closer components. This makes it possible, for example, to correct a misalignment of the drive piston with respect to the closer shaft rotatably mounted on the door closer housing, as can result for example from manufacturing and / or assembly tolerances on the door closer. In particular, tilting of the drive piston relative to the inner wall of the door closer housing that guides the drive piston along the housing axis of the door closer housing, resulting from a misalignment of the drive piston with respect to the closer shaft, can be avoided. Such tilting would be associated with an undesirable increase in the friction which occurs when the drive piston moves along the housing axis between the drive piston and the inner wall of the door closer housing guiding it. Increased friction would impair the efficiency of the door closer.

So that, regardless of the tilting movement of the drive piston in the tilting plane, adequate guidance of the drive piston is guaranteed, especially during the drive piston closing movement, the intermediate part provided according to the invention between the drive piston and the damping piston ensures that the drive piston is supported essentially free of play on the damping piston in a transverse direction the tilting plane, in particular the support plane running perpendicular to the tilting plane. The damping piston is mounted essentially free of play on the door closer housing both in the tilting plane and in the support plane and consequently prevents the drive piston supported on it and tiltable per se from executing tilting movements relative to the door closer housing in the support plane. The damping piston accordingly takes over the guidance of the drive piston connected to it via the piston connection along the housing axis of the door closer housing. The course of the support plane in the transverse direction, in particular perpendicular to the shaft rotation axis of the closer shaft, is due to the fact that due to the conditions in the force transmission between the drive piston and the cam disc on the closer shaft in a plane running transversely, in particular perpendicular to the shaft rotation axis of the closer shaft, to a special degree tilting moments acting on the drive piston are to be expected.

According to patent claim 9, the combination of tilting mobility and substantially play-free support of the drive piston is realized with the aid of the intermediate part between the drive piston and the damping piston. Via the intermediate part, the drive piston can be tilted in the tilting plane and is mounted on the damping piston essentially without play in the support plane.

In a further preferred embodiment of the invention, the tilting mobility of the drive piston relative to the door closer housing and to the damping piston is realized in that the drive piston is positioned along the housing axis has non-uniform outer diameter (claim 10). The drive piston according to the invention has at least one piston section of smaller diameter, on which the drive piston is spaced from an inner wall of the door closer housing running along the housing axis, and at least one piston section of larger diameter, on which the drive piston on the inner wall of the door closer housing is movable along the housing axis is led. The piston section of smaller diameter enables the desired tilting mobility of the drive piston relative to the door closer housing due to the play existing between this piston section and the inner wall of the door closer housing. At the same time, the larger diameter piston section ensures effective mounting of the drive piston on the inner wall of the door closer housing.

Only the radially expanded section of the drive piston is in contact with the inner wall of the door closer housing. Only this piston section must therefore have good sliding properties. Good sliding properties can be dispensed with for the piston section or sections of the drive piston with reduced diameter. In the case of drive pistons made of steel, for example, there is no need for grinding and hardening of the drive piston section or sections of reduced diameter.

According to patent claim 11, the drive piston has the piston section of larger diameter at the end remote from the damping piston along the housing axis. As a result, the drive piston has a particularly large guide length between its piston section of larger diameter and the damping piston which is also used to guide the drive piston.

In the case of the inventive design according to claim 12, the tiltable drive piston is in several parts. A piston base body forms the piston section (s) of smaller diameter, and a radial piston extension attached to the piston base body forms the piston section of larger diameter.

According to patent claim 13, a piston ring attached to the piston base body is provided as a radial piston extension. Such piston rings are commercially available and can be connected to the piston base body in a simple manner in terms of manufacturing technology, for example they can be inserted into a circumferential groove of the piston base body.

The multi-part design of the drive piston offers the advantage that each of the piston parts can be matched to specific requirements in terms of its nature. In this sense, patent claim 14 provides that the larger diameter piston section of the drive piston is made of a friction-reducing material on the side facing the inner wall of the door closer housing. For the piston body, a material can be selected that has no special sliding properties, but which is, for example, particularly suitable for absorbing the forces acting between the drive piston on the one hand and the closer shaft or the damping piston on the other.

Claim 15 relates to a particularly practice-relevant embodiment of the door closer according to the invention. The drive piston is supported on the closer shaft via a bearing roller arranged between the drive piston and the closer shaft, which in turn is rotatable about a roller axis of rotation running along the axis of rotation of the closer shaft. With a bearing surface running along the axis of rotation of the roller, the bearing roller rests on the control surface of the cam disc provided on the closer shaft. If the drive piston is tiltable, the bearing roller can align itself with respect to the cam disk in the tilting plane in such a way that the bearing surface of the bearing roller on the drive piston side and the control surface of the cam disk on the closer shaft side are in line with one another in the tilting plane even when the cam disk is in line with one another, for example due to manufacturing and assembly tolerances on the closer shaft have an undesirable inclination with respect to the housing axis of the door closer housing.

Figur 1

eine Teildarstellung eines ersten erfindungsgemäßen Ausführungsbeispiels;

Figur 2

die Anordnung gemäß Figur 1 in der Ansicht in Richtung des Pfeils II in Figur 1

Figur 3

die Anordnung gemäß den Figuren 1 und 2 in einer in Figur 2 senkrecht zu der Zeichenebene entlang der Linie III-III verlaufenden Darstellungsebene,

Figur 4

eine Teildarstellung eines zweiten erfindungsgemäßen Ausführungsbeispiels;

Figur 5

die Anordnung gemäß Figur 4 in der Ansicht in Richtung des Pfeils V in Figur 4 und

Figur 6

den Federkolben und den Zwischenteil des Türschließers gemäß den Figuren 4 und 5.

The invention is explained in more detail below with the aid of exemplary schematic representations. Show it:

Figure 1

a partial representation of a first embodiment of the invention;

Figure 2

the arrangement according to Figure 1 in the view in the direction of arrow II in Figure 1

Figure 3

the arrangement according to the Figures 1 and 2 in an in Figure 2 representation plane running perpendicular to the plane of the drawing along the line III-III,

Figure 4

a partial representation of a second embodiment of the invention;

Figure 5

the arrangement according to Figure 4 in the view in the direction of arrow V in Figure 4 and

Figure 6

the spring piston and the intermediate part of the door closer according to the Figures 4 and 5 .

According to the Figures 1 to 3 includes a door closer 1 in Figure 2 Door closer housing 2 indicated by dashed lines. A closer shaft 3 is mounted on door closer housing 2 so as to be rotatable about a shaft axis of rotation 4. In the interior of the door closer housing 2, the closer shaft 3 is provided with a cam disk 5 which has a control surface 6 extending parallel to the shaft rotation axis 4.

The door closer housing 2 is hollow-cylindrical and has a housing axis 7, along which a drive piston in the form of a spring piston 8 is arranged on one side of the closer shaft 3 and a damping piston 9 is arranged on the opposite side of the closer shaft 3.

The spring piston 8 is acted upon by a closing force generator designed as a closer spring 10 in the direction of the closer shaft 3. The closer spring 10 is pretensioned between the spring piston 8 and a front housing cover of the door closer housing 2, not shown in the figures. On the closer shaft side, the spring piston 8 is supported by a bearing surface 11 of a bearing roller in the form of a spring piston bearing roller 12 on the control surface 6 of the cam disk 5. The spring piston bearing roller 12 is rotatable about a first roller axis of rotation 13 and is otherwise mounted on the spring piston 8 essentially without play. The first roller rotation axis 13 of the spring piston bearing roller 12 runs parallel to the shaft rotation axis 4 of the closer shaft 3. The bearing surface 11 of the spring piston bearing roller 12 extends parallel to the first roller rotation axis 13.

The damping piston 9 on the side of the closer shaft 3 remote from the spring piston 8 is inserted into the Figures 1 to 3 soft compression spring not shown (see Figure 4 ) in the direction of the closer shaft 3 is acted upon by force. Under the action of the compression spring, a damping piston bearing roller 14 with a bearing surface 15 rests on the associated part of the control surface 6 of the cam disk 5. On the damping piston 9, the damping piston bearing roller 14 is rotatable about a second roller axis of rotation 16 and is otherwise mounted essentially without play. The second roller rotation axis 16 of the damping piston bearing roller 14 runs parallel to the shaft rotation axis 4. The bearing surface 15 on the damping piston bearing roller 14 extends parallel to the second roller rotation axis 16. On the side of the damping piston 9 remote from the closer shaft 3, a cylinder space 17 is formed in the door closer housing 2 which is filled with a hydraulic pressure medium.

Between the spring piston 8 and the damping piston 9, an intermediate part 18 is provided which extends along the housing axis 7 of the door closer housing 2 on the closer shaft 3. The intermediate part 18 comprises a total of four support arms 19, which are provided as intermediate part elements (see also Figure 6 ).

In the example shown, the support arms 19 are designed as drive piston or spring piston extensions and are manufactured in one piece with the spring piston 8. A pair of support arms 19 is arranged on each side of closer shaft 3, the support arms 19 of each pair along shaft axis of rotation 4 of closer shaft 3, forming an axial gap 20 from one another are spaced. The axial spaces 20 on both sides of the closer shaft 3 accommodate the cam disk 5 of the closer shaft 3.

With their free ends, the support arms 19 rest on a shaft-side end face 21 of the damping piston 9. The support arms 19 are releasably slipped onto bearing projections 22 of the damping piston 9.

Along the housing axis 7 of the door closer housing 2, the spring piston 8 and the damping piston 9 can be pulled apart or pushed together, overcoming the friction between the support arms 19 of the intermediate part 18 and the bearing projections 22 of the damping piston 9. Before establishing the plug connection between the spring piston 8 and the damping piston 9, the closer shaft 3 with the cam disc 5 was inserted into the space enclosed by the support arms 19 in such a way that the cam disc 5 was in the axial spaces 20 between the support arms adjacent to one another along the shaft rotation axis 4 19 of the intermediate part 18 came to rest. The axially extending outer surface of the support arms 19 is aligned with the peripheral surfaces of the spring piston 8 and the damping piston 9. As a result, the arrangement consisting of the spring piston 8, the damping piston 9 and the intermediate part 18 is both with the spring piston 8 and the damping piston 9 as well as with the Intermediate part 18 is guided on door closer housing 2 during movements along housing axis 7.

The door closer 1 can be mounted on a door as an overhead door closer in the usual way. A connection between a door leaf and a fixed door frame of the door is established via a linkage attached to the closer shaft 3 and not shown in the figures.

If the door leaf is opened in rotation, the closer shaft 3, driven via the linkage, executes a rotary movement in an opening direction of rotation 23 together with the lifting cam 5 formed on it ( Figure 3 ). As a result, the relevant part of the control surface 6 of the cam 5 and the bearing surface 11 of the spring piston bearing roller 12 roll off one another and the spring piston 8 is displaced inside the door closer housing 2 along the housing axis 7 counteracts the action of the closer spring 10 acting on it with an opening movement of the drive piston in the direction of an arrow 24 in FIG Figure 3 . Synchronously with the spring piston 8, the damping piston 9 moves under the action of the compression spring acting on it with a damping piston opening movement in the direction of the arrow 24. The closer spring 10 is pretensioned due to the drive piston opening movement.

If the door leaf is released after opening, the closer spring 10 relaxes. The spring piston 8 acted upon by the closer spring 10 consequently leads a drive piston closing movement in the direction of an arrow 25 in FIG Figure 3 out. A part of the force exerted by the closer spring 10 on the spring piston 8 is transferred to the cam disk 5 of the closer shaft 3 via the spring piston bearing roller 12 rotatably mounted on the spring piston 8, thereby causing a closing movement of the cam disk 5 and the closer shaft in the opposite direction to the opening direction of rotation 23 3 in a closing direction of rotation 26. Via the linkage provided between the fixed door frame and the door leaf, the closing rotary movement of the closer shaft 3 is converted into a closing movement of the door leaf.

The part of the force introduced by the closer spring 10 into the spring piston 8 that is available and not used to close the door leaf is for the most part carried away by the spring piston 8 into the damping piston 9 via the intermediate part 18. The damping piston 9, which is acted upon by force by the spring piston 8 via the intermediate part 18, consequently executes a damping piston closing movement in the direction of the arrow 25 and thereby displaces the hydraulic damping medium in the cylinder chamber 17, which flows out of the cylinder chamber 17 via a hydraulic line (not shown). The reaction force that occurs as a result of the displacement of the hydraulic damping medium from the cylinder space 17 is transferred from the damping piston 9 into the drive piston 8 via the intermediate part 18.

A mutual application of force to the damping piston bearing roller 14 mounted on the damping piston 9 and the cam disc 5 on the closer shaft 3 occurs during the closing movement of the drive piston and the resulting movement Cushion piston closing movement only to a small extent. Only those forces are transmitted between the damping piston bearing roller 14 and the cam disc 5 which act due to the action of the damping piston 9 by the compression spring, from which the damping piston 9 is applied on the side remote from the closer shaft 3 and which essentially serves to establish the contact between the damping piston 9 or the damping piston bearing roller 14 on the one hand and the cam 5 on the other hand, and thereby synchronizing the movements of the spring piston 8 and the damping piston 9 along the housing axis 7.

A door closer 31, as it is in the Figures 4 to 6 is shown differs from the door closer 1 according to FIGS Figures 1 to 3 due to the special structural design of a drive piston designed as a spring piston 32.

Notwithstanding the spring piston 8 according to the Figures 1 to 3 the spring piston 32 has a stepped outer diameter along the housing axis 7. On both sides of a piston section 33 of larger diameter, piston sections 34, 35 of smaller diameter are provided on the spring piston 32. The piston section 33 of larger diameter is formed by means of a piston ring 36 designed as a sliding ring, which is inserted into a circumferential groove 37 of a piston base body 38.

In the example shown, the spring piston 32 on the piston ring 36 has an outer diameter of 34 mm corresponding to the inner diameter of the hollow-cylindrical door closer housing 2. The piston sections 34, 35, which are smaller in diameter than the piston section 33, on both sides of the piston ring 36 have a diameter of 33.7 mm and 33.5 mm. Accordingly, the spring piston 32 is only in contact with the inner wall of the door closer housing 2 at the piston section 33.

Both on the door closer 1 according to Figures 1 to 3 as well as on the door closer 31 according to the Figures 4 to 6 is the course of the line of action between the spring piston 8 or the spring piston bearing roller 12 and the closer shaft 3 or the lifting cam 5 acting and generated by the closer spring 10 force depending on the rotational position of the lifting cam 5 and thus on the opening angle of the door leaf equipped with the door closer 1, 31.

When the door leaf is closed, the line of action of the force in question runs along the housing axis 7 through the first roller axis of rotation 13, the shaft axis of rotation 4 and the second roller axis of rotation 16. If the door leaf is opened and the cam disc 5 is accordingly in the opening-rotation direction 23 around the shaft axis of rotation 4 rotated, the location of the mutual support of the cam 5 and the spring piston bearing roller 12 is displaced from the housing axis 7 and there result in the course of the opening movement of the door leaf, for example, the conditions according to the Figures 3 and 4 . The line of action of the force acting between the cam disk 5 and the spring piston bearing roller 12 is in the Figures 3 and 4 indicated by dashed lines.

Due to the course of its line of action, that is in accordance with the functional state of the door closer 1 Figure 3 and the door closer 31 according to Figure 4 between the spring piston bearing roller 12 and the cam 5 acting force tends to move the spring piston 8, 32 in the plane of the Figures 3, 4 to tilt against the housing axis 7.

A tilting movement of the spring piston 8 is, however, already prevented by the fact that the spring piston 8 is guided on the inner wall of the door closer housing 2 essentially without play over its entire axial length. In addition, there is the fact that the spring piston 8 over the intermediate part 18 of the plane of the drawing Figure 3 is supported essentially free of play on the damping piston 9 and the damping piston 9 is also mounted essentially free of play on the inner wall of the door closer housing 2.

In contrast, the spring piston 32, unlike the spring piston 8, is only supported over part of its length, namely on the piston section 33 of larger diameter or on the piston ring 36, essentially free of play on the inner wall of the door closer housing 2 and consequently relative to the door closer housing 2 tiltable. The tilting mobility of the spring piston 32 results accordingly from the gradation of its outer diameter. Since the extension of the piston ring 36 on the spring piston 32 along the housing axis 7 is relatively small and since the piston ring 36 is arranged near the end of the spring piston 32 facing the closer spring 10 and has a certain elasticity, the spring piston 32 can be compared to the inner wall of the door closer housing 2 per se execute a pivoting movement in which the piston ring 36 forms a pivot bearing for the spring piston 32 together with the inner wall of the door closer housing 2.

Such a tilting movement of the spring piston 32 is shown in the plane of the drawing which forms a support plane Figure 4 but prevented by the positive fit between the support arms 19 of the intermediate part 18 on the one hand and the bearing projections 22 of the damping piston 9 on the other hand, which is effective in this plane.

The positive fit between the support arms 19 of the intermediate part 18 and the bearing projections 22 of the damping piston 9 ensures that the spring piston 32 is in the plane of representation of Figure 4 is supported substantially free of play on the damping piston 9, the damping piston 9 also being mounted on the inner wall of the door closer housing 2 substantially free of play in this support plane.

The spring piston 32 is tiltable in a plane perpendicular to the support plane of Figure 4 running tilting plane. Tilting movements of the spring piston 32 are possible in this plane because the support arms 19 are movable parallel to the tilting plane relative to the bearing projections 22 of the damping piston 9.

The tilting mobility of the spring piston 32 in the tilting plane is used, for example, in cases in which the shaft rotation axis 4, unlike the first roller rotation axis 13 of the spring piston bearing roller 12, is not exactly perpendicular to the housing axis 7 due to manufacturing and / or assembly tolerances. In such cases, the spring piston 32 can pivot due to its tilting mobility in the tilting plane in a position in which the bearing surface 11 of the Irrespective of the misalignment of the shaft rotation axis 4, the spring piston bearing roller 12 rests with a line contact on the control surface 6 of the cam disk 5. If this were not the case, the cam disk 5 and the spring piston bearing roller 12 would roll on one another along a line of contact when the door leaf is opened and closed. Edge pressure would occur, as a result of which the cam disk 5 and the spring piston bearing roller 12 would be subjected to severe wear.

Claims (15)

1. Door closer

   • comprising a door closer housing (2) which has a housing axis (7),

   • comprising a closer shaft (3) which is rotatably mounted on the door closer housing (2) about a shaft axis of rotation (4) extending transversely to the housing axis (7), and is provided, inside the door closer housing (2), with a cam disk (5) which cam disk (5) has a control surface (6) extending along the shaft axis of rotation (4),

   • comprising a drive piston (8, 32) which is arranged in the door closer housing (2) along the housing axis (7) on one side of the closer shaft (3) and is movably guided on the door closer housing (2) along the housing axis (7),

   • comprising a closing force generator (10) which applies force to the drive piston (8, 32) along the housing axis (7) toward the closer shaft (4), the drive piston (8, 32) to which force is applied by the closing force generator (10) being movable along the housing axis (7) with a drive-piston-closing movement directed toward the shaft axis of rotation (4) of the closer shaft (3), and in the process being supported on the control surface (6) of the cam disk (5) of the closer shaft (3),

   • comprising a damping piston (9) which is arranged in the door closer housing (2) on the side of the closer shaft (3) remote from the drive piston (8, 32) and is movably guided on the door closer housing (2) along the housing axis (7), the damping piston (9), due to the drive-piston-closing movement, being drivable with a damping-piston-closing movement against the effect of a counterforce delaying the drive-piston-closing movement, and

   • comprising an intermediate part (18) which extends between the drive piston (8, 32) and the damping piston (9) along the housing axis (7) past the closer shaft (3),

   characterized in that the drive piston (8, 32), during the drive-piston-closing movement, is supported on the damping piston (9) in the direction of movement via the intermediate part (18) and thereby drives the damping piston (9) with the damping-piston-closing movement.
2. Door closer according to claim 1, characterized in that the intermediate part (18) extends between the drive piston (8, 32) and the damping piston (9) along the housing axis (7) past the closer shaft (3) on both sides thereof.
3. Door closer according to claim 2, characterized in that the intermediate part (18) has two pairs of intermediate part elements (19) between the drive piston (8, 32) and the damping piston (9), the intermediate part elements (19) of one pair extending on one side of the closer shaft (3) and the intermediate part elements (19) of the other pair extending on the other side of the closer shaft (3) along the housing axis (7), and the intermediate part elements (19) of the same pair being spaced apart from one another along the shaft axis of rotation (4) of the closer shaft (3) so as to form an axial intermediate space (20).
4. Door closer according to claim 3, characterized in that the cam disk (5) of the closer shaft (3) is arranged in the axial intermediate space (20) of at least one of the pairs of intermediate part elements (19).
5. Door closer according to any of the preceding claims, characterized in that the drive piston (8, 32) and the damping piston (9) are detachably interconnected via the intermediate part (18).
6. Door closer according to any of the preceding claims, characterized in that the intermediate part (18) between the drive piston (8, 32) and the damping piston (9) has a drive piston extension on the drive piston (8, 32), which extension is made in one piece with the drive piston (8, 32) or forms, together with the drive piston (8, 32), a two-piece unit, and which extends along the housing axis (7) toward the damping piston (9), and/or in that the intermediate part (18) between the drive piston (8, 32) and the damping piston (9) has a damping piston extension on the damping piston (9), which extension is made in one piece with the damping piston (9) or forms, together with the damping piston (9), a two-piece unit, and which extends along the housing axis (7) toward the drive piston (8, 32).
7. Door closer according to any of the preceding claims, characterized in that the intermediate part (18) between the drive piston (8, 32) and the damping piston (9) is guided on the door closer housing (2) along the housing axis (7).
8. Door closer according to any of the preceding claims, characterized in that the drive piston (32) is tiltable relative to the door closer housing (2) and the damping piston (9),

   • the drive piston (9) being tiltable relative to the door closer housing (2) and the damping piston (9) in a tilting plane extending along the housing axis (7) and along the shaft axis of rotation (4) of the closer shaft (3), and the intermediate part (18) between the drive piston (32) and the damping piston (9) being designed such that the intermediate part (18) allows a tilting movement of the drive piston (32) relative to the door closer housing (2) and to the damping piston (9) in the tilting plane extending along the housing axis (7) and along the shaft axis of rotation (4) of the closer shaft (3),

   • the intermediate part (18) between the drive piston (32) and the damping piston (9) simultaneously supporting the drive piston (32) on the damping piston (9), against a tilting movement relative to the door closer housing (2) and to the damping piston (9), without play in a support plane extending along the housing axis (7) and in the transverse direction of the shaft axis of rotation (4) of the closer shaft (3), and

   • the damping piston (9) being supported on the door closer housing (2) without play in the tilting plane and in the support plane.
9. Door closer according to claim 8, characterized in that the intermediate part (18) between the drive piston (32) and the damping piston (9) allows a tilting movement of the drive piston (32) relative to the door closer housing (2) and to the damping piston (9) in the tilting plane and simultaneously supports the drive piston (32) on the damping piston (9), against a tilting movement relative to the door closer housing (2) and to the damping piston (9), without play in the support plane by the drive piston (32), via the intermediate part (18), being tiltably supported in the tilting plane and supported without play on the damping piston (9) in the support plane.
10. Door closer according to either claim 8 or claim 9, characterized in that the drive piston (32) is tiltable in the tilting plane relative to the door closer housing (2) and to the damping piston (9) by the drive piston (32) having a non-uniform outer diameter along the housing axis (7), wherein the drive piston (32) has at least one piston portion (34, 35) having a smaller diameter, at which portion the drive piston (32) is spaced apart from an inner wall of the door closer housing (2), which inner wall extends along the housing axis (7), and wherein the drive piston (32) has at least one piston portion (33) having a larger diameter, at which portion the drive piston (32) is tiltably mounted on the inner wall of the door closer housing (2) and is movably guided along the housing axis (7).
11. Door closer according to claim 10, characterized in that the drive piston (32) has the larger-diameter piston portion (33) at the end of the drive piston (32) remote from the damping piston (9) along the housing axis (7).
12. Door closer according to either claim 10 or claim 11, characterized in that the drive piston (32) has a piston main body (38) which forms the smaller-diameter piston portion (34, 35) and to which a radial piston extension forming the larger-diameter piston portion (33) is attached.
13. Door closer according to claim 12, characterized in that a piston ring (36) attached to the piston main body (38) is provided as the radial piston extension.
14. Door closer according to any of claims 10 to 13, characterized in that the larger-diameter piston portion (33) of the drive piston (32) consists of a friction-reducing material on the side facing the inner wall of the door closer housing (2).
15. Door closer according to any of the preceding claims, characterized in that a bearing roller (12) is arranged between the drive piston (8, 32) and the closer shaft (3), which bearing roller is rotatable about a roller axis of rotation (13) extending along the shaft axis of rotation (4) of the closer shaft (3) and has a bearing surface (11) which extends along the roller axis of rotation (13) and via which the drive piston (8, 32) to which force is applied by the closing force generator (10) toward the closer shaft (3) is supported on the control surface (6) of the cam disk (5) provided on the closer shaft (3).

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