Door Closer with a Drive

Abstract

A door closer includes a housing; a shaft supported in the housing and connectable to a door; a brake piston supported in the housing and charging the shaft, the brake piston and the housing defining a first space away from the shaft; a blocking member; a spring loading the blocking member and extending orthogonally from the housing; and a pump for pumping brake fluid to or from the first space. The pump is disposed in a second space formed between the housing and the spring. The shaft is lockable in a position by the blocking member.

Description

The inventive door closer is represented in the FIGS. 1 to 3 only to an extent that is of interest for the present invention.

The inventive door closer presents a substantially rectangular housing 1, in which a shaft 2 is supported, which is connectable to a door or the like. The shaft 2 presents an eccentric disc 3, which is in engagement with a roller 5 supported at a brake piston 4.

The brake piston 4 in return is longitudinally and displaceably supported in the housing 1, whereby it is being urged into the direction of the shaft 2 by means of a spring 6, which is likewise supported within the housing 1.

At the brake piston 4, a seal 7, which bears against the walling of the housing 1, is disposed in a peripheral groove. A regulating valve 8 is provided at the end of the housing 1 remote from the shaft 2, which valve affects the movement of the brake piston 4 by regulating the flow of the brake fluid within the housing 1. Thus, e.g. the door or the like can be locked in a determined position, for example in the open position.

In order to allow for intentionally moving the door, in the event the door or the like is being blocked, a shut-off valve 9 is provided, which automatically closes upon intentionally moving the door. For this purpose a small piston or a valve seat may be provided for example, which, on account of friction of an O-ring at the valve seat, prevents brake fluid from flowing, however, which will be displaced when excess pressure builds up in the brake fluid, for example through intentionally moving the door, such that the blocking is released and the door can be moved. Basically, an electromagnetic actuating of the shut-off valve 9 is possible as well, such that the inventive door closer can be used in emergency and evacuating routes.

A tube-shaped bushing 12 or a cartridge extends orthogonally to the housing 1, which bushing is detachably disposed at the housing 1 and in which a blocking member 13 is longitudinally and displaceably supported. The blocking member 13 has a cup-shaped insert 14, which is supported within the tube-shaped bushing 12 and is urged into the direction of the shaft 2 by means of a spring 15, which is likewise supported within the bushing 12.

A casing 10, in which a pump 11 and/or a drive motor 22 are accommodated, is provided in the space formed between the housing 1 and the tube-shaped bushing 12. The overall door closer has a substantially square form on account of this design. The casing 10 is detachably mounted at the housing 1, respectively at the tube-shaped bushing 12. The pump 11, via hydraulic lines 23, is in communication with the inside of the housing 1 and with the inside of the tube-shaped bushing 12.

When using a motor or a combination of motor and pump, the door closer can thus automatically open the door as well, as an additional feature. The subsequent closing operation can be realized via the existing spring energy.

A support 16 protrudes from the bottom of the cup-shaped insert 14 into the direction of the housing 1, which support, at the front end thereof, carries a roller 17, which engages for example into a recess 18 at the shaft 2, respectively at the eccentric disc 3.

In order to ensure the most friction-less and the least wearing movement of the cup-shaped insert 14 in the tube-shaped bushing 12, a friction reducing and/or wear reducing coating or insert 19 is provided, for example made from steel.

FIG. 3 depicts an alternative embodiment of the inventive door closer, in which the brake piston 4 is in communication with the shaft 2 via a rocker 20 and an eccentric disc 21.

The inventive door closer is preferably intended for use as a floor spring; however, it is suitable for other mounting situations as well.

REFERENCES

1 housing

2 shaft

3 eccentric disc

4 brake piston

5 roller

6 spring

7 seal

8 regulating valve

9 shut-off valve

10 casing

11 pump

12 tube-shaped bushing

13 blocking member

14 cup-shaped insert

15 spring

16 support

17 roller

18 recess

19 coating or insert

20 rocker

21 eccentric disc

22 drive motor

23 hydraulic line

Claims

1-17. (canceled)

18. A door closer comprising: a housing;a shaft supported in the housing and connectable to a door;a brake piston supported in the housing and charging the shaft, the brake piston and the housing defining a first space away from the shaft;a blocking member;a first spring loading the blocking member and extending orthogonally from the housing; anda pump for providing at least one of functions of pumping brake fluid to the first space and pumping brake fluid from the first space, the pump being disposed in a second space formed between the housing and the first spring,wherein the shaft is lockable in a position by the blocking member.

19. The door closer of claim 18, further comprising a drive motor for driving the pump, the drive motor being disposed in the second space.

20. The door closer of claim 18, further comprising a tube-shaped bushing which is detachably connected to the housing and extends orthogonally therefrom, the first spring being supported in the tube-shaped bushing.

21. The door closer of claim 19, further comprising a tube-shaped bushing which is detachably connected to the housing and extends orthogonally therefrom, the first spring being supported in the tube-shaped bushing.

22. The door closer of claim 21, further comprising a casing detachably connected to the housing and the tube-shaped bushing, the pump and the drive motor being received in the casing.

23. The door closer of claim 21, further comprising a casing detachably connected to the housing and the tube-shaped bushing, the drive motor being received in the casing.

24. The door closer of claim 20, wherein the blocking member comprises a cup-shaped insert displaceably supported in the tube-shaped bushing.

25. The door closer of claim 24, wherein the cup-shaped insert has a bottom facing the shaft, the blocking member further comprising a support which protrudes from the bottom of the cup-shaped insert into the housing and has a roller cooperating with the shaft.

26. The door closer of claim 24, wherein the first spring is disposed in the tube-shaped bushing and loads the cup-shaped insert in the direction of the housing.

27. The door closer of claim 24, further comprising a friction or wear reducing element between the tube-shaped bushing and the cup-shaped insert.

28. The door closer of claim 18, further comprising an eccentric disc mounted on the shaft, and a second spring which charges the brake piston toward the eccentric disc.

29. The door closer of claim 18, further comprising a seal between the housing and the brake piston.

30. The door closer of claim 18, further comprising a valve arrangement, and wherein the brake piston is lockable in a predetermined position by means of the valve arrangement.

31. The door closer of claim 30, wherein the valve arrangement comprises a regulating valve, and a shut-off valve which affects flow of the regulating valve.

32. The door closer of claim 31, wherein the shut-off valve automatically opens at a predetermined pressure.

33. The door closer of claim 31, wherein the shut-off valve is operable to be electro-magnetically actuated.

34. The door closer of claim 28, wherein the brake piston comprises a roller which engages the eccentric disc.

35. The door closer of claim 18, wherein the brake piston is coupled to the shaft by means of a rocker and an eccentric disc.