Door actuator

Abstract

A door actuator for opening and/or closing a door leaf includes a housing, an output shaft rotatably supported in the housing and with a cam disc, wherein the output shaft is formed for transferring torque onto the door leaf. A first element of motion is linearly movably guided in the housing with a first contact surface. A second element of motion is linearly movably guided in the housing with a second contact surface. A distancing arrangement is disposed in the housing. The cam disc is disposed between the two contact surfaces and for rolling on the two contact surfaces. In at least one delimiting range of angles of rotation of the output shaft, the distancing arrangement delimits the minimum distance between the elements of motion, and, in at least one free range of angles of rotation, does not delimit the linear mobility of the two elements of motion in relation to each other.

Claims

1. A door actuator for opening and/or closing a door leaf, the door actuator comprising: a housing, an output shaft rotatably supported in the housing and with a cam disc, wherein the output shaft is formed for transferring torque onto the door leaf, a first element of motion, which is linearly movably guided in the housing and has a first contact surface, a second element of motion, which is linearly movably guided in the housing and has a second contact surface, and a distancing arrangement disposed in the housing, wherein the cam disc is disposed between the two contact surfaces and disposed for rolling on the two contact surfaces, wherein, in at least one delimiting range of angles of rotation of the output shaft, the distancing arrangement delimits a minimum distance between the elements of motion and in at least one free range of angles of rotation, does not delimit the linear mobility of the two elements of motion in relation to each other, and wherein, in the at least one delimiting range of angles of rotation, only one of the two contact surfaces rests against the cam disc and the other contact surface is spaced apart from the cam disc.

2. The door actuator according to claim 1, wherein in each free range of angles of rotation, the two contact surfaces rest against the cam disc.

3. The door actuator according to claim 1, wherein the cam disc is heart-shaped and includes a pointed area, wherein, at a position of angle of rotation of 0°, the pointed area is directed towards the second contact surface and a first delimiting range of angles of rotation is between −10° and +10°.

4. The door actuator according to claim 3, wherein the cam disc is heart-shaped and includes a depressed area, wherein, at a position of angle of rotation of V, a centre of the depressed area is directed towards the second contact surface, wherein V is between 120° and 140°, and wherein a second delimiting range of angles of rotation is between V −45° and V +45°.

5. The door actuator according to claim 1, wherein the distancing arrangement comprises a distancing element, wherein the distancing element is linearly movably guided in one of the two elements of motion, and in the delimiting range of angles of rotation abuts against said one of the two elements of motion.

6. The door actuator according to claim 5, wherein the distancing element linearly movably slides in a recess in one of the two elements of motion.

7. The door actuator according to claim 5, wherein the distancing element includes a shoulder as an abutment.

8. The door actuator according to claim 5, wherein the distancing element is firmly connected to one of the two elements of motion or is formed integrally with one of the two elements of motion.

9. The door actuator according to claim 1, wherein the distancing arrangement includes a distancing cam disc on the output shaft and a distancing element at the second element of motion, wherein the distancing element is firmly connected to the second element of motion or integrally formed with the second element of motion, wherein in the at least one delimiting range of angles of rotation the distancing cam disc rests against the distancing element.

10. The door actuator according to claim 9, wherein the radius at a pointed area of the distancing cam disc is greater than the radius at a pointed area of the cam disc.

11. The door actuator according to claim 1, comprising a first spring in the housing, wherein the first element of motion is movable using the first spring in the direction of the cam disc.

12. The door actuator according to claim 11, comprising a second spring in the housing, wherein the second element of motion is movable using the second spring in the direction of the cam disc.

13. The door actuator according to claim 1, comprising a hydraulic chamber in the housing, wherein, by moving the second element of motion, fluid is configured to be driven out of the hydraulic chamber through a throttle.

14. The door actuator according to claim 1, wherein the first contact surface is formed by a first roller rotatably supported in the first element of motion, or wherein the second contact surface is formed by a second roller rotatably supported in the second element of motion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The disclosure will now be described in more detail, based on two exemplary embodiments. In the figures:

(2) FIG. 1 is a diagrammatical view of an inventive door actuator according to a first exemplary embodiment,

(3) FIGS. 2 to 7 are detailed illustrations of the inventive door actuator according to the first exemplary embodiment, and

(4) FIGS. 8 to 11 are detailed illustrations of the inventive door actuator according to a second exemplary embodiment.

DETAILED DESCRIPTION OF THE DRAWINGS

(5) Based on FIGS. 1 to 11, two exemplary embodiments of a door actuator 1 will be explained. The identical, respectively functionally identical structural components are identified by the same reference numerals in both exemplary embodiments.

(6) FIG. 1 shows a diagrammatical illustration of the entire door actuator 1 for the first exemplary embodiment. For the second exemplary embodiment, the door actuator 1 is configured in the same way, just with the modifications, which will be described based on the FIGS. 8 to 11 with the second exemplary embodiment.

(7) FIG. 1 shows a diagrammatical sectional view of the door actuator 1 with the housing 2 thereof. An output shaft 4 is rotationally movably supported in the housing 2. The output shaft 4 is rotationally movable about an output axis 3.

(8) A cam disc 5 is located on the output shaft 4. The cam disc 5 and the output shaft 4 are located between a first element of motion 6 and a second element of motion 11. Herein, the first element of motion 6 is formed as an opening piston. Herein, the second element of motion 11 is formed as a dampening piston. The entire door actuator 1 is formed as a door closer.

(9) The two elements of motion 6, 11 are linearly movably guided vertically with regard to the output axis 3 in the housing 2.

(10) The first element of motion 6 includes a first roller 8. The circumferential surface of the first roller 8 forms a first contact surface 7. In the first element of motion 6, the first roller 8 is rotationally movably supported about a first roller axis 9. The first roller axis 9 extends parallel to the output axis 3.

(11) The second element of motion 11 includes a second roller 13. The circumferential surface of the second roller 13 forms a second contact surface 12. The second roller 13 is rotationally movably supported about a second roller axis 14 in the second element of motion 11. The second roller axis 14 extends parallel to the output axis 3.

(12) Furthermore, the door actuator 1 includes a first spring 10. Herein, the first spring 10 serves as the closing spring. The first spring 10 is disposed in the housing 2 on a side of the first element of motion 6 facing away from the cam disc 5. On the one side, the first spring 10 props up against the first element of motion 6, on the other side, the first spring 10 can prop up against the housing 2 or against a non-illustrated spring adjustment. Upon opening the door, said first spring 10 is tensioned. By relaxing the first spring 10, then according to the illustration in FIG. 1, the first element of motion 6 can move to the left hand side, wherefrom results a rotary movement of the cam disc 5 and thus of the output shaft 4. Furthermore, the door actuator 1 comprises a second spring 15 in the housing 2. The second spring 15 is located on the side of the second element of motion 11 facing away from the cam disc 5. One side of the second spring 15 props up against the second element of motion 11. In the illustration according to FIG. 1, the arrangement of the two springs 10, 15 is purely diagrammatically shown.

(13) Furthermore, FIG. 1 shows purely diagrammatically a hydraulic chamber 16 within the housing 2. During the linear movement thereof, the second element of motion 11 can drive fluid out of the hydraulic chamber 16, wherefrom results a dampening of the movement of the second element of motion 11.

(14) Furthermore, FIG. 1 shows that the two rollers 8, 13 have roller shafts 18. Said roller shafts 18 extend along the first, respectively the second roller axis 9, 14. When mounting, said roller shafts 18 are inserted into the respective element of motion 6, 11, and secured with bolts 17 against falling out. Then said bolts 17 extend correspondingly vertically to the roller axes 9, 14.

(15) Furthermore, FIG. 1 shows a distancing arrangement 20 at, respectively between the two elements of motion 6, 11.

(16) FIGS. 2 to 7 show the detailed configuration of the distancing arrangement 20 according to the first exemplary embodiment.

(17) According to FIG. 2, the distancing arrangement 20 comprises two distancing elements 21, herein formed as rods.

(18) Each distancing element 21 includes an extension 22. Said extension 22 is linearly movably inserted into a recess 23 in the second element of motion 11. On the opposite side, the distancing elements 21 are firmly connected to the first element of motion 6.

(19) On account of the linear mobility between the extension 22 and the recess 23, basically, the two elements of motion 6, 11 are movable in relation to each other vertically to the output axis 3.

(20) However, in order to delimit a distance 32 between the two elements of motion 6, 11, in certain positions of angles of rotation of the output shaft 4, respectively of the cam disc 5, the individual distancing element 21 includes a shoulder 24. At the desired minimum distance, said shoulder 24 can abut against the second element of motion 11. In particular the illustration in FIG. 5 shows that, at the corresponding position of angle of rotation, an interspace can result between the shoulder 24 of the distancing element 21 and the second element of motion 11.

(21) FIG. 2 shows the cam disc 5 in a vertical plane with regard to the output axis 3. In this case, it can be very well seen that the cam disc 5 is heart-shaped formed. Said heart shape has a pointed area 30 and an opposite depressed area 31. In the position illustrated according to FIG. 2, the pointed area 30 is directed towards the second contact surface 12. In particular in said position, the door leaf is in the closed position thereof. Accordingly, said position of angle of rotation of the door leaf and of the output shaft 4 and of the cam disc 5 is described with 0°.

(22) Said position of angle of rotation of 0° defines a first delimiting range of angles of rotation 33. In particular, said first delimiting range of angles of rotation 33 extends over the pointed area 30 of the cam disc 5. Approximately opposite thereof is defined a second delimiting range of angles of rotation 34. The second delimiting range of angles of rotation 34 extends approximately over the depressed area 31 of the cam disc 5. The precise ranges of angles for the two delimiting ranges of angles of rotation 33, 34 have been defined in the general part. Two free ranges of angles of rotation 35 are located between the two delimiting ranges of angles of rotation 33, 34.

(23) In the illustration according to FIG. 2, the door actuator is in the position of angle of rotation of 0° and thus within the first delimiting range of angles of rotation 33. Herein, the distancing arrangement 22 is formed such that the shoulder 24 rests against the second element of motion 11 and thus the distance 32 is delimited. Therefrom results an interspace 36 between the second contact surface 12 and the cam disc 5, whereby a too large a surface load in the pointed area 30 is prevented. FIGS. 3, 4, 6 and 7 in a magnifying type show the area between the second roller 13 and the cam disc 5 in an enlarged illustration.

(24) FIG. 3, just like FIG. 2, shows the position of angle of rotation of 0°. In said enlarged illustration can be seen the interspace 36 between the second contact surface 12 and the pointed area 30 of the cam disc 5.

(25) FIG. 4 shows the transition from the first delimiting range of angles of rotation 33 to the neighbouring free range of angles of rotation 35. During said movement, the interspace 36 continuously decreases until the second contact surface 12 reaches contact with the cam disc 5.

(26) FIG. 5 shows the door actuator 1 in the free range of angles of rotation 25, in which the contact between the second contact surface 12 and the cam disc 5 is established. In contrast to the delimiting range of angles of rotation 33, 34, herein the distance 32 increased between the two elements of motion 6, 11. Accordingly, also the shoulder 24 does not rest anymore against the second element of motion 11. Both rollers 8, 13 and thus both contact surfaces 7, 12 roll on the cam disc 5.

(27) FIG. 6 shows the transition from the free range of angles of rotation 35 into the second delimiting range of angles of rotation 34. In the illustration according to FIG. 6, the second contact surface 12 is still in contact with the cam disc 5.

(28) FIG. 7 illustrates the second delimiting range of angles of rotation 34. Herein, the distancing arrangement 20 delimits the distance 32 again to a minimum distance such that the interspace 36 is adjusted between the second contact surface 12 and the cam disc 5. Based on the FIG. 7, it can be seen that, in the second delimiting range of angles of rotation 34, the second roller 13 does not rest in the depressed area 31 of the heart-shaped cam disc 5.

(29) The second exemplary embodiment of the door actuator 1 is described based on the FIGS. 8 to 11. The basic structure of the door actuator 1 is already described based on FIG. 1. The two exemplary embodiments just differ in the configuration of the distancing arrangement 20.

(30) FIG. 8 shows a perspective view of two anti-rotation protections 37, which are formed as rods. Said two anti-rotation protections 37 are inserted in the two elements of motion 6, 11 and they are linearly movably guided in said two elements of motion 6, 11. However, the anti-rotation protections 37 do not include an abutment, which would prevent a contact between one of the contact surfaces 7, 12 and the cam disc 5. The two anti-rotation protections 37 just serve for the purpose the two elements of motion 6, 11 will not rotate about an axis, which is vertical with regard to the output axis 3.

(31) The distancing arrangement 20 of the second exemplary embodiment comprises a distancing element 21, which, herein however, is just inserted into the second element of motion 11. Herein, the distancing element 21 is firmly connected to the second element of motion 11. As an alternative, the distancing element 21 could also be an integral component of the second element of motion 11.

(32) Furthermore herein, the distancing arrangement 20 comprises a distancing cam disc 38 on the output shaft 4. In the exemplary embodiment shown, the distancing cam disc 38 is spaced apart from the cam disc 5. The two anti-rotation protections 37 extend between the distancing cam disc 38 and the cam disc 5.

(33) Herein, the distancing element 21 and the distancing cam disc 38 are formed and disposed such that they contact each other in the first and second delimiting ranges of angles of rotation 33, 34 and thereby delimit the distance 32. There is no contact between the distancing element 21 and the distancing cam disc 38 in the two free ranges of angles of rotation 35.

(34) In the second exemplary embodiment, the distancing element 21 simultaneously fulfills the function of the bolt 17, because the distancing element 21 is disposed such that it secures the roller shaft 18 of the second roller 13 against falling out.

(35) FIGS. 9 to 11 show illustrations for the second exemplary embodiment in a plane vertical to the output axis 3.

(36) FIG. 9 shows the first delimiting range of angles of rotation 33. Herein, the distancing cam disc 38 and the distancing element 21 are in contact and thereby delimit the distance 32 such that there is an interspace 36 between the second contact surface 12 and the cam disc 5.

(37) FIG. 10 shows one of the two free ranges of angles of rotation 35. Herein, both contact surfaces 7, 12 are in contact with the cam disc 5. The distancing cam disc 38 and the distancing element 21 do not contact each other.

(38) FIG. 11 shows the second delimiting range of angles of rotation 34, in which again the interspace 36 is adjusted by a contact between the distancing element 21 and the distancing cam disc 38.

(39) As further clarified in FIGS. 8 to 11, also the distancing cam disc 38 is formed heart-shaped and correspondingly includes a pointed area and an opposite depressed area.

(40) Preferably, a radius 39 at the pointed area of the distancing cam disc 38 is configured to be larger than a radius 40 at the pointed area of 30 of the cam disc 5.