Device for closing a door or window leaf

Abstract

A closing device (10) for closing a door or window sash, comprising a spring piston (16) acted upon by a spring (14) for applying a closing force to a closing shaft (18) and a damping piston (22) for damping the movement of the closing shaft (18), is designed and further developed in such a way as to provide a reliable and durable closing device with simple design means, such that the damping piston (22) and / or the spring piston (16) each have a piston body (32, 34), wherein a cup-shaped recess (36, 38) is formed on the end face of the piston body (32, 34), into which an insert (40) with a roller (42) for engagement with the closing shaft (18) is inserted, wherein the roller (42) is rotatably mounted on the insert (40) by means of an axle (44).

Description

[0001] The invention relates to a locking device for closing a door or window sash with the features of the preamble of claim 1.

[0002] Conventional locking devices for closing a door or window sash are known from the prior art, for example from DE 198 57 267 C1 or from DE 102 59 237 A1.

[0003] This allows the corresponding leaves to be operated. However, these locking devices consist of numerous individual components, most of which are manufactured by machining. The manufacturing effort and costs are therefore comparatively high.

[0004] A locking device of the type mentioned above is known from WO 2019 / 076746 A1. It proposes forming the damping piston from plastic and the spring piston from a non-ferrous metal alloy, with foot sections formed on the spring piston that bridge the closer shaft and rest against the damping piston in foot-receiving sections. Both pistons are insert-free. A roller is rotatably mounted on each of the damping piston and the spring piston, which roller is in contact with the closer shaft. It has been found that, in particular, the forces acting from the roller on the bearing surfaces of the damping piston can lead to fatigue and erosion of the piston material and to a reduced service life. In addition, force transmission via the foot sections requires adherence to tight tolerances to avoid damage to the foot sections. Therefore, there is a need for optimization.

[0005] EP 1 134 349 A2, GB 2 462 633 A, DE 10 2014 103 580 B3, and EP 2 738 334 A2 each disclose a locking device with several features of claim 1. EP 1 431 494 A2 discloses a door closer whose housing and piston each have a metal insert overmolded with plastic. The piston serves as both a spring and damper piston and has a toothing for engagement with the closer shaft.

[0006] The invention is based on the object of providing a reliable and durable locking device using simple design means. It is desirable to reduce manufacturing effort and costs.

[0007] The invention solves this problem by a locking device having the features of claim 1.

[0008] According to this, the locking device is characterized in that the damping piston and / or the spring piston (each) has / has a piston body, wherein a cup-shaped recess is formed on the end face of the piston body, into which an insert with a roller for engagement with the closer shaft is inserted (fitting), wherein the roller is rotatably mounted on the insert by means of an axis (roller bolt).

[0009] The damping piston or spring piston is thus essentially constructed in two parts: a piston body and an insert. The insert distributes the forces exerted by the roller over a comparatively large piston surface (surface section of the piston body) and counteracts material fatigue and erosion. Conventional bearing bushes for roller pins do not achieve sufficient force distribution across the piston surface. This contributes to the reliable design of a locking device, with the large-area force distribution allowing the use of easier-to-process materials, such as zinc, brass, or plastic.

[0010] The recess is formed on the end face of the piston body, which (when the piston is installed) faces the closer shaft. The end faces of the piston body refer to the axial ends.

[0011] As already explained above, the recess in the piston body is cup-shaped, i.e., it is limited inwardly within the piston body (blind hole). The recess can have a cylindrical shape (e.g., annular disk-shaped) (interior space), which is laterally (e.g., radially) limited outwardly by a wall of the piston body.

[0012] The shaft (piston pin) can optionally be secured against axial displacement relative to the insert with one or more washers or retaining rings. When installed, the roller protrudes partially from the insert and the piston.

[0013] The locking device can have a housing in which the components of the locking device are arranged. The locking device can be a door closer for closing a door or window sash. The door or window sash can be moved, in particular pivoted, from a fully or partially open position to the closed position by means of the door closer.

[0014] Furthermore, according to the invention, the insert is made of a material that is not the same as the piston body. The insert is thus made of a different material than the piston body. The insert can be formed as a separate component from the piston body.

[0015] Furthermore, according to the invention, the piston body and the insert are designed such that the ratio between the contact surface of the axle (roller pin) on the insert (roller pin contact surface) to the cross-sectional area of ​​the recess on the piston body (area on the piston body usable by the insert) is between 1:5 and 1:10, in particular 1:7. This achieves a distribution of force over a sufficiently large area so that fatigue and erosion can be largely avoided. The contact surface of the axle refers to the effective contact surface of the axle in the insert, i.e. the area effective in the direction of force application between the sections of the axle that rests in corresponding bearing sections (inner circumferential surface of the openings) of the insert.

[0016] Advantageously, the insert, roller, and axle can form a pre-assembled unit that can be inserted into the recess of the piston body in a pre-assembled state. This contributes to simple assembly and high stability. If washers or retaining rings are provided for axially securing the axle, these can also be part of the pre-assembled unit.

[0017] In a preferred embodiment, the insert can have an outwardly projecting, at least partially circumferential collar at one end, with which the insert, when inserted into the piston body, rests (on the front side) against a wall of the piston body, which laterally delimits the recess. The collar specifies a defined insertion depth of the insert. In addition, the risk of incorrect assembly is significantly reduced. The collar can be used to enlarge the contact surface between the insert and the piston body.

[0018] Advantageously, the insert can have a pocket (roller receiving pocket), preferably formed centrally within the insert, in which the roller is arranged (when assembled), with walls of the insert surrounding the pocket laterally and outwardly (circumferentially). Thus, the insert surrounds the roller in a ring-like manner. This contributes to a secure and stable arrangement. Furthermore, a uniform load on the insert is achieved. The axle (roller pin) can be rotatably mounted in the wall of the insert (insert wall) (openings in the wall for the axle or roller pin).

[0019] The wall of the piston body, which laterally delimits the recess on the outside, can expediently be designed such that, when the insert is inserted, the wall at least partially covers the openings formed in the insert in which the axle (roller pin) is arranged. This allows a structurally simple and reliable securing of the axle to be achieved. Sliding out of the axle is prevented. An additional securing element can be dispensed with. In the area where the opening for the axle is located, a preferably arc-shaped recess can be formed on the wall of the piston body. This can save material. Access for a fluid, e.g. hydraulic oil, is created.

[0020] Advantageously, an axial passage can be formed in the piston body, in which an overload valve, a check valve, and / or a combined overload / check valve (combination valve) are arranged. This allows for flow control of the fluid, e.g., hydraulic oil. Safety functions (overload) can also be implemented. The passage can extend from an axial end of the piston body, which faces away from the recess for the insert, to the recess for the insert. At the end facing away from the recess, the passage can have a radially expanded section.

[0021] Specifically, the piston body can have a circumferential surface with a groove extending circumferentially, in which a sliding ring and / or a sealing ring (e.g., an O-ring) is arranged. This enables a seal between the piston (piston body) and the raceway formed in the housing of the locking device.

[0022] Alternatively or additionally, the piston body can have a circumferential surface on which a lip seal ring is formed, in particular integrally molded, running circumferentially. This contributes to a structurally advantageous design with fewer components.

[0023] The piston body can conveniently be designed as an injection-molded plastic part, particularly a thermoplastic, such as POM (polyoxymethylene). This contributes to simple and cost-effective production. Machining (e.g., turning and milling) can be largely eliminated.

[0024] In a preferred embodiment, the insert can be designed as a metallic die-cast part, particularly as a zinc die-cast or brass die-cast part. This also contributes to simple and cost-effective production.

[0025] The insert and / or the piston body can be designed expediently without support elements (feet) to bridge the closing shaft (support-element-free design). This facilitates production and assembly, as the comparatively sensitive support elements are eliminated.

[0026] Advantageously, the insert of the damping piston and the insert of the spring piston can be identically designed. The insert is thus designed in such a way that it can be used for both spring pistons and damping pistons. This contributes to universal application and cost savings. To adapt to the closer shaft (contour of the cam disc), the insert of the spring piston and damping piston can have differently designed rollers, e.g., a roller with a continuous contour (constant cross-section) or a roller with spaced-apart roller sections that project radially (relative to a base section).

[0027] The spring piston and / or the damping piston can be advantageously designed such that the insert is overmolded by the piston body. This facilitates assembly, as the insert is inserted into a mold and overmolded by the piston body. Insertion thus takes place directly during the molding of the piston body, reducing assembly effort.

[0028] The invention is explained in more detail below with reference to the figures, in which identical or functionally equivalent elements are provided with identical reference numerals, if necessary, but only once. They show: Fig.1 shows an embodiment of a locking device in a side view and two sectional views; Fig.2a-c shows the spring piston of the locking device from Fig.1 in a perspective view ( Fig.2a ), a side view ( Fig.2b ) and a sectioned view ( Fig.2c ) along a Figur 2b drawn section axis AA; Fig.3a-cdamping piston of the locking device from Fig.1 in a perspective view ( Fig.3a ), a side view ( Fig.3b ) and a sectioned view ( Fig.3c ) along a Figur 3b drawn section axis CC; and Fig.4a-dthe insert part of the spring piston or the damper piston of the locking device from Figur 1 in a perspective front view ( Fig.4a ), a perspective rear view ( Fig.4b ), a cross-section ( Fig.4c ) along a Figur 4b drawn section axis DD and a longitudinal section ( Fig.4d ) along a Figur 4c marked section axis EE.

[0029] Figur 1 shows a locking device, designated overall by reference numeral 10. The locking device 10 is a door closer for closing a door or window sash.

[0030] The locking device 10 has a housing 12 in which the components of the locking device 10 are arranged. The locking device 10 has a spring piston 16 loaded with a spring 14, which exerts a closing force on the closer shaft 18 via the cam disc 19. The closer shaft 18 has connecting sections 20 protruding from the housing 12, which can be connected to a rod system for driving the door or window sash (not shown). The closer shaft 18 is rotatably mounted in the housing 12 of the locking device 10.

[0031] The locking device 10 also has a separate damping piston 22 for damping the movement of the closer shaft 18. The damping piston 22 ensures that the closer shaft 18 does not rotate suddenly when acted upon by the spring 14 and spring piston 16, but rather at a reduced speed, so that the door or window sash is driven at a defined, possibly constant, speed.

[0032] On the side of the spring piston 16 facing away from the closer shaft 18, a pressure chamber 24 is formed when the opening damping is implemented (the door or window sash is damped during the opening movement). The closer shaft 18 is located between the spring piston 16 and the damping piston 22 in a pressure-free chamber 26 (tank chamber). On the side of the damping piston 22 facing away from the closer shaft 18, there is a pressure chamber 28 that dampens the rotation of the closer shaft 18 during a closing movement. The housing 12 of the locking device 10 is closed at each end by closure pieces 30.

[0033] In the example, the spring piston 16 has a piston body 32 on the front side of which a cup-shaped recess 36 is formed (cf. Fig.2c ). An insert 40 with a roller 42 for engagement with the closer shaft 18 is inserted into the recess 36. The roller 42 is rotatably mounted on the insert 40 by means of an axle 44 (roller bolt 44). Optionally, washers or retaining rings 41 can be provided for axially securing the axle 44 (see Fig.2c ).

[0034] The damping piston 22 has a piston body 34, on the front side of which a cup-shaped recess 38 is formed (cf. Fig. 3c ). An insert 40 with a roller 42' for engagement with the closer shaft 18 is also inserted into the recess 38. The roller 42 is rotatably mounted on the insert 40 by means of an axle 44 (roller bolt 44). Optionally, discs or retaining rings 41 can be provided for axially securing the axle 44 (cf. Fig.3c ). The roller 42' of the damping piston 22 has two axially spaced and radially projecting roller sections 43 for adaptation to the closer shaft 18.

[0035] The insert 40 is constructed of a material that is not uniform with the piston body 32, 34 (a different material than the piston body). In the example, the piston body 32, 34 and the insert 40 are constructed such that the ratio between the contact surface of the axis 44 on the insert 40 and the cross-sectional area of ​​the recess 36, 38 on the piston body 32, 34 is between 1:5 and 1:10, in particular 1:7.

[0036] In the example, the insert part 40, the roller 42, 42' and the axle 44 form a pre-assembled structural unit 46 which, in the pre-assembled state, can be inserted into the recess 36, 38 of the piston body 32, 34 of the spring piston 16 or damping piston 22 (cf. Fig.2c and 3c). If present, the discs or retaining rings 41 can also form part of the assembly 46.

[0037] The insert part 40 has at one end 48 an outwardly projecting, preferably circumferential, collar 50 (cf. Fig.4a-d ), with which the insert part 40, when inserted into the piston body 32, 34, rests on the end face against a wall 52, 54 of the piston body 32, 34, which laterally delimits the recess 36, 38 to the outside (cf. Fig.2b and 3b ).

[0038] The insert part 40 has a pocket 56 (roller receiving pocket 56) preferably formed centrally in the insert part 40 (cf. Fig.4a-d ), in which the roller 42 is arranged in the assembled state. Walls 58 of the insert 40 surround the pocket 56 laterally and outwardly (cf. Fig.2a and 3a ).

[0039] The wall 52, 54 of the piston body 32, 34, which laterally delimits the recess 36, 38, is designed in such a way that the wall 52, 54, when the insert part 40 is inserted, has openings 60, 62 formed in the insert part 40 (cf. Fig.4a,b ), in which the axis 44 is arranged, are at least partially covered (cf. Fig.2b and 3b ). In the area where the opening 60, 62 for the axis 44 is located, a preferably arcuate recess 84, 86 can optionally be formed on the wall 52, 54 of the piston body 32, 34 (cf. Fig.2b and 3b ).

[0040] An axial passage 64 is formed in the piston body 32 of the spring piston 16, in which, for example, a combined overload and check valve 66 (combination valve 66) is arranged (cf. Fig.2c ). The passage 64 extends from the end of the piston body 32 facing away from the recess 36 to the recess 36 for the insert 40. An axial passage 68 is formed in the piston body 34 of the damping piston 22, in which an overload valve 70 is arranged (cf. Fig.3c ). The passage 68 extends from the end of the piston body 34 facing away from the recess 38 to the recess 38 for the insert 40. The damping piston 22 may have a check valve (not shown).

[0041] The piston bodies 32, 34 each have a jacket surface 72, 74 on which a circumferential groove 76, 78 is formed, in which a sliding ring 80 or a sealing ring 82 (e.g. an O-ring 82) is arranged (cf. Fig.2c and 3c). Alternatively, the piston bodies 32, 34 can have a jacket surface 72, 74 on which a circumferentially extending lip sealing ring is formed, for example, is injection-molded during manufacture (not shown).

[0042] The piston bodies 32, 34 are each formed as an injection-molded part made of plastic, in particular of thermoplastic plastic, for example of POM (polyoxymethylene).

[0043] The insert 40 is designed as a metallic die-cast part, in particular as a zinc die-cast or brass die-cast part. The insert 40 is designed without support elements (feet) for bridging the closing shaft 18 (support-element-free design).

[0044] The insert 40 of the damping piston 22 and the insert 40 of the spring piston 16 are identical in the example. The roller 42, 42' can be adapted to the closer shaft 18, as explained above.

[0045] The spring piston 16 and / or the damping piston 22 can be designed such that the insert part 40 is overmolded by the piston body 32, 34.

Claims

1. A closing device (10) for closing a door or window leaf, comprising a spring piston (16) acted upon by a spring (14) for applying a closing force to a closer shaft (18) and a separate damping piston (22) for damping the movement of the closer shaft (18), wherein the damping piston (22) and / or the spring piston (16) has a piston body (32, 34), wherein a cup-shaped recess (36, 38) is formed on the end face of the piston body (32, 34), into which recess an insert part (40) with a roller (42) for engagement with the closer shaft (18) is inserted, wherein the roller (42) is rotatably mounted on the insert part (40) by means of a spindle (44), characterized in that the insert part (40) is made of a material that is not uniform with the piston body (32, 34), and in that the piston body (32, 34) and the insert part (40) are designed such that the ratio between the bearing surface of the spindle (44) on the insert part (40) to the cross-sectional area of the recess (36, 38) on the piston body (32, 34) is between 1:5 and 1:10, in particular 1:7.

2. The closing device (10) according to claim 1, characterized in that the insert part (40), the roller (42) and the spindle (44) form a pre-assemblable structural unit (46) which, in the pre-assembled state, can be inserted into the recess (36, 38) of the piston body (32, 34).

3. The closing device (10) according to either of the preceding claims, characterized in that the insert part (40) has at one end (48) an outwardly projecting, at least partially circumferential, collar (50) with which the insert part (40), when inserted into the piston body (32, 34), rests against a wall (52, 54) of the piston body (32, 34), which laterally delimits the recess (36, 38) outward, and / or in that the insert part (40) has a pocket (56) which is preferably formed centrally in the insert part (40) and in which the roller (42) is arranged, wherein walls (58) of the insert part (40) surround the pocket (56) laterally outward.

4. The closing device (10) according to one of the preceding claims, characterized in that the wall (52, 54) of the piston body (32, 34), which laterally delimits the recess (36, 38) outward, is designed such that, when the insert part (40) is inserted, the wall (52, 54) at least partially covers openings (60, 62) formed in the insert part (40), in which openings the spindle (44) is arranged.

5. The closing device (10) according to one of the preceding claims, characterized in that an axial passage (64, 68) is formed in the piston body (32, 34), in which an overload valve (70), a check valve and / or a combined overload / check valve (66) is arranged.

6. The closing device (10) according to one of the preceding claims, characterized in that the piston body (32, 34) has a lateral surface (72, 74) on which a groove (76, 78) extending in the circumferential direction is formed, in which a sliding ring (80) and / or a sealing ring (82) is arranged, and / or in that the piston body (32, 34) has a lateral surface (72, 74) on which a lip sealing ring which extends in the circumferential direction is formed, in particular is injection-molded on.

7. The closing device (10) according to one of the preceding claims, characterized in that the piston body (32, 34) is designed as an injection-molded part made of plastics material, in particular of thermoplastic material, for example of POM (polyoxymethylene).

8. The closing device (10) according to one of the preceding claims, characterized in that the insert part (40) is designed as a metal die-cast part, in particular as a zinc die-cast or brass die-cast part, and / or in that the insert part (40) is designed free of support elements for bridging the closer shaft (18).

9. The closing device (10) according to one of the preceding claims, characterized in that the insert part (40) of the damping piston (22) and the spring piston (16) are identical.

10. The closing device (10) according to one of the preceding claims, characterized in that the insert part (40) is overmolded by the piston body (32, 34).

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