Hydraulic locking device

Abstract

Hydraulic locking device (10) for closing sequence control for a double-leaf door with a fixed leaf, a moving leaf and a sliding block (100) connected to the moving leaf, which is arranged to be movable along a sliding rail (101) in accordance with an opening angle of the moving leaf, wherein the locking device (10) comprises: - a hydraulic cylinder (11), - a piston (13) movably arranged within the hydraulic cylinder (11) between a first position and a second position, - a stopper (17) connected to the piston (13) for blocking the movement of the sliding block (100) along the slide rail (101) in a direction of movement corresponding to the closing direction of the active leaf, which stopper (17) is suitable for being arranged to be movable along the slide rail (101) between a release position corresponding to the first position of the piston (13), in which the sliding block (100) is released to close the active leaf, and a blocking position corresponding to the second position of the piston (13), in which the movement of the sliding block (100) is blocked to prevent the active leaf from closing, - a first hydraulic circuit (19), - a second hydraulic circuit (21) and - a control element (23) which can be switched between a first position and a second position depending on an opening angle of the inactive leaf and which is suitable for opening the first hydraulic circuit (19) and closing the second hydraulic circuit (21) in the first position in order to move the piston (13) hydraulically into the blocking position to move the stopper (17), and for closing the first hydraulic circuit (19) and opening the second hydraulic circuit (21) in the second position in order to move the piston (13) into the release position to move the stopper (17).

Description

[0001] The invention relates to a hydraulic locking device for closing sequence control for a double-leaf door with a fixed leaf, a moving leaf and a sliding block connected to the moving leaf, which is arranged to be movable along a sliding rail according to an opening angle of the moving leaf.

[0002] Double-leaf doors have a passive leaf and a moving leaf, each of which is usually equipped with a door closer, particularly for fire safety reasons, to prevent the leaves from remaining in an open position after opening. To prevent the two leaves, each of which is particularly equipped with a rebate, from wedging when closed by the door closer, it must be ensured that the passive leaf always closes before the moving leaf. For this purpose, double-leaf doors are equipped with a closing sequence control. This usually consists of a locking device that holds the moving leaf in a waiting position corresponding to a specific opening position to allow the passive leaf to close correctly, and a device that releases the locking device when the passive leaf is closed or almost closed.

[0003] Such closing sequence controls are typically implemented as mechanical systems in which the inactive and active leaves are connected via pull cables, rods, or gears. The linkage of the door closer on the active leaf is then mechanically locked to prevent the active leaf from closing. However, mechanical systems are highly susceptible to wear and tear and have very limited locking force. Therefore, mechanical systems often fail to meet the relevant standard requirements. Furthermore, high locking forces frequently lead to jamming of the locking mechanism, meaning the closing force of the door closer is insufficient to move the door from the waiting position and close it securely.

[0004] Document DE 196 50 809 A1 discloses a locking device used for a door sequence control. The locking device has a door closer on the active leaf side, which has a hydraulic piston-cylinder system, with a valve or blocking device in its hydraulic circuit for locking the sliding arm.

[0005] It is an object of the present invention to propose a locking device with reduced wear and increased locking forces.

[0006] This object is achieved according to the invention by a hydraulic locking device having the features of claim 1. Advantageous embodiments are the subject of the dependent claims and are specified in the description and the drawings.

[0007] The hydraulic locking device according to the invention is used for closing sequence control for a double-leaf door, which has a fixed leaf, a moving leaf, and a sliding block connected to the moving leaf, which is arranged to be movable along a slide rail according to an opening angle of the moving leaf. The locking device comprises - a hydraulic cylinder, - a piston movably arranged within the hydraulic cylinder between a first position and a second position, - a stopper connected to the piston for blocking the movement of the sliding block along the slide rail in a direction of movement corresponding to the closing direction of the active leaf, which stopper is suitable for being arranged to be movable along the slide rail between a release position corresponding to the first position of the piston, in which the sliding block is released to close the active leaf, and a blocking position corresponding to the second position of the piston, in which the movement of the sliding block is blocked to prevent the active leaf from closing, - a first hydraulic circuit, - a second hydraulic circuit and - a control element which can be switched between a first position and a second position as a function of an opening angle of the inactive leaf and which is suitable for opening the first hydraulic circuit and closing the second hydraulic circuit in the first position in order to hydraulically move the piston into the locking position to move the stopper, and for closing the first hydraulic circuit and opening the second hydraulic circuit in the second position in order to move the piston into the release position to move the stopper.

[0008] The invention therefore solves this problem by proposing a hydraulic locking device in which the closing movement of the active leaf is blocked via the sliding block and the stopper when the stopper and the piston are in the locking position and the second position due to an actuation of the control element and the resulting opening of the first hydraulic circuit and the closing of the second hydraulic circuit. The active leaf is thus held in place by the sliding block.

[0009] With the hydraulic lock according to the invention, significantly higher locking forces can be achieved compared to mechanical locks within the same installation space. For example, at 30 bar hydraulic pressure, locking forces of 1000 N can be easily achieved, whereas conventional mechanical locks generally cannot exceed locking forces of 450 N. Furthermore, the hydraulic lock is less susceptible to wear than mechanical locks, especially at high locking forces. This allows for greater coverage on standard-compliant door systems. Furthermore, it can be ensured that the piston only extends into the locking position when the passive leaf is open. This protects seals and reduces oil loss due to drag oil.

[0010] The control element can be a spring-loaded control piston, which is preferably preloaded into the first position. In this embodiment, the control piston is stable in the first position when not actuated due to the spring force. In particular, it can be provided that actuation occurs when the closing passive leaf falls below a predetermined opening angle.

[0011] Preferably, the control element is accommodated in a receiving bore of the hydraulic cylinder, which is provided with an inlet and an outlet of the first hydraulic circuit and an inlet and an outlet of the second hydraulic circuit. Due to the inlets and outlets, the control element can be used to open and close the hydraulic circuits by actuating the control element.

[0012] The hydraulic cylinder can have a fluid chamber and a compressed air chamber, which are separated from each other by the piston, wherein a piston rod of the piston extends through the compressed air chamber away from the piston, wherein the first hydraulic circuit has an inlet to the fluid chamber and an outlet from the compressed air chamber, and wherein the second hydraulic circuit has an inlet to the compressed air chamber and an outlet from the fluid chamber. The locking device can then be filled with hydraulic oil when the piston and piston rod are extended. The available air volume in the compressed air chamber is then pressurized. When the piston rod now retracts, the pressure is further increased.Due to the pressure applied on both sides, the piston extends with the piston rod as soon as the first hydraulic circuit is opened, since the piston rod on the compressed air chamber side of the piston leads to a surface difference compared to the fluid chamber side of the piston, so that a total force acting in the direction of the compressed air chamber acts on the piston.

[0013] In an advantageous embodiment, the outflow of the first hydraulic circuit, when the locking device is in its intended assembled state, is located in a lower region of the compressed air chamber, which, when the piston is in its second position, is preferably below an oil level of hydraulic oil in the compressed air chamber, and the outflow of the second hydraulic circuit, when the locking device is in its intended assembled state, is located in an upper region of the fluid chamber, which, when the piston is in its first position, is preferably above an oil level of hydraulic oil in the fluid chamber. This prevents air from the compressed air chamber from entering the fluid chamber. Furthermore, it can be ensured that any air present, for example due to storage and assembly, can be removed from the fluid chamber at any time.For example, the first hydraulic circuit can be located below the second hydraulic circuit when the locking device is mounted as intended.

[0014] The control element can have a circumferential surface and be provided on the circumferential surface with two recesses, in particular annular grooves, running in the circumferential direction of the control element for releasing the first hydraulic circuit or the second hydraulic circuit. The recesses or annular grooves can release a path between the inlet and the outlet of a respective hydraulic circuit, so that the hydraulic circuit is opened. If, however, the control element is displaced axially so that the inlet and / or the outlet of a circuit are blocked by the circumferential surface of the control element, the respective hydraulic circuit is closed. A first recess, in particular annular groove, can open the first hydraulic circuit in the first position of the control element, and a second recess, in particular annular groove, can open the second hydraulic circuit in the second position of the control element.

[0015] Preferably, the second hydraulic circuit has an adjustable safety valve, which, when open, releases a bypass flow to bypass the control element in the second hydraulic circuit. Thus, the locking device has an overload mechanism in which the safety valve can be used to yield to a closing force exerted on the active leaf if the closing force exceeds a certain threshold, i.e., in particular, if an attempt is made to force the active leaf to close.

[0016] The safety valve may have a valve ball that is preloaded by a spring and closes a valve inlet. The valve ball can be moved away from the valve inlet against the spring force to open the safety valve. Adjustment can be achieved, for example, by an adjusting screw provided on the safety valve or by appropriate selection or dimensioning of the spring.

[0017] In an advantageous embodiment, the first hydraulic circuit and / or the second hydraulic circuit have a check valve. The check valve provided in the first hydraulic circuit can, in particular, ensure that no hydraulic oil flows out of the fluid chamber when the first hydraulic circuit is open. The check valve provided in the second hydraulic circuit, on the other hand, can ensure that no air enters the fluid chamber when the piston and piston rod extend.

[0018] The control element can be controlled, for example, mechanically, in particular by means of a wire rope, or electrically.

[0019] The invention is explained below using an exemplary embodiment. The drawings schematically illustrate the exemplary embodiment and show: Fig. 1 is a sectional view of a locking device in which the piston and the stopper are in the second position and the locking position, and a further sectional view of the locking device in which the piston and the stopper are in the first position and the release position, Fig. 2 a perspective view of the locking device from Fig. 1, in which the first hydraulic circuit and the second hydraulic circuit are visible, Fig. 3 a sectional view of the locking device from Fig. 1 along the section line A-0-A in Fig. 5, which shows the closed first hydraulic circuit in the second position of the control element, and a further sectional view along the section line A-0-A in Fig. 5, which shows the open first hydraulic circuit in the first position of the control element, Fig. 4 a sectional view of the locking device from Fig. 1 along the section line B-0-B in Fig. 5, which shows the closed second hydraulic circuit in the first position of the control element, and a further sectional view along the section line B-0-B in Fig. 5, which shows the opened second hydraulic circuit in the second position of the control element, and Fig. 5 a sectional view of the locking device from Fig. 1, which illustrates a safety valve of the second hydraulic circuit.

[0020] Fig. 1 and Fig. 2 show a locking device 10 with a hydraulic cylinder 11. In the hydraulic cylinder 11, a piston 13 with a piston rod 15 is movably arranged and separates a fluid chamber 35 and a compressed air chamber 37, through which the piston rod 15 extends away from the piston 13.

[0021] A stopper 17 is firmly connected to the piston rod 15, which further extends out of the hydraulic cylinder 11 through an opening in a closure 65 of the hydraulic cylinder 11. The stopper 17 has a flange 18 to block the movement of a sliding block 100, which is movably arranged in a slide rail 101, in the direction of the hydraulic cylinder 11. The sliding block 100 is connected to a moving leaf (not shown) of a double-leaf door in such a way that it is moved along the slide rail 101 according to the opening angle of the moving leaf, namely away from the hydraulic cylinder 11 when the moving leaf is opened and towards the hydraulic cylinder 11 when the moving leaf is closed. When the moving leaf is closed, the sliding block 100 rests against the stopper 17 of the retracted piston 13. The stopper 17 with the flange 18 can therefore block a closing movement of the active leaf by holding the sliding block 100.

[0022] Fig. 1 shows, on the one hand (top), a view of the locking device 10 in which the piston 13 with the piston rod 15 is in a second position, so that the stopper 17 is in a locking position, and, on the other hand (bottom), a view of the locking device 10 in which the piston 13 with the piston rod 15 is in a first position, so that the stopper 17 is in a release position. In the second position, a shoulder 67 of the piston rod 15 rests against an inner wall of the closure 65 and thus limits the axial movement of the piston 13. In the first position, the piston 13 contacts an inner wall of the fluid chamber 35 and thereby limits the axial movement of the piston 13 in the opposite direction.

[0023] The locking device 10 also has a first hydraulic circuit 19 and a second hydraulic circuit 21, as well as a control element 23 designed as a control piston. The control element 23 is received in a receiving bore 25 of the hydraulic cylinder 11, has two recesses 47, 49 designed as annular grooves in the circumferential direction, and can be mechanically controlled or actuated by means of a wire cable 63. The wire cable 63 is connected to a non-illustrated inactive leaf of the double-leaf door, so that the control element 23 can be actuated by means of the wire cable 63 depending on the opening angle of the inactive leaf. If the opening angle of the inactive leaf exceeds a predetermined value, for example, approximately 5° to 10°, the wire cable 63 is released due to the opening angle of the inactive leaf. A tensile force acting on the wire cable 63 is canceled or reduced.The control element 23 is then moved axially against a stop, namely the axial end of the receiving bore 25, due to the spring force of a spring 69. If the opening angle of the inactive leaf falls below the predetermined value, the control element 23 is subjected to a tensile force via the wire cable 63, which counteracts the spring force of the spring 69. Due to the tensile force, the spring 69 is compressed and the control element 23 is moved against another, opposite stop, namely an inner wall of a closure 66 of the hydraulic cylinder 11.

[0024] As in particular Fig. 2, the first hydraulic circuit 19 has an inlet 27 to and an outlet 29 from the receiving bore 25, i.e. to and from the control element 23, an inlet 39 to the fluid chamber 35, and an outlet 41 from the compressed air chamber 37. The second hydraulic circuit 21 has an inlet 31 to and an outlet 33 from the receiving bore 25, an inlet 43 to the compressed air chamber 37, and an outlet 45 from the fluid chamber 35.

[0025] Fig. Figure 2 shows the locking device 10 in the orientation as it exists in the properly mounted state. The first hydraulic circuit 19 is located entirely below the second hydraulic circuit 21. The outlet 41 of the first hydraulic circuit 19 from the compressed air chamber 37 is located in a lower region of the compressed air chamber 37, which is always arranged below the oil level 38 of hydraulic oil in the compressed air chamber 37. The outlet 45 of the second hydraulic circuit 21 from the fluid chamber 35 is located in an upper region of the fluid chamber 35, which is arranged above the oil level 38 of hydraulic oil in the fluid chamber 35 even in the release position of the stopper 17.

[0026] In the first position, see in particular Fig. 3 below and Fig. 4 above, the control element 23 is positioned within the receiving bore 25 such that the recess 47 opens the first hydraulic circuit 19 by forming a channel between the inlet 27 and the outlet 29. The second hydraulic circuit 21, however, is closed because the outlet 33 is blocked by the control element 23, so that there is no fluid connection between the inlet 31 and the outlet 33. In this state, the piston 13 is hydraulically moved into the blocked position due to the pressure acting on it from both sides and due to the area difference created by the piston rod 15, i.e. the piston rod 15 is extended to hold the sliding block 100 in such a way that the active leaf cannot close completely.

[0027] In the second position, see in particular Fig. 3 above and Fig. 4 below, the control element 23 is positioned within the receiving bore 25 such that the recess 49 opens the second hydraulic circuit 21 by forming a channel between the inlet 31 and the outlet 33. The first hydraulic circuit 19, however, is closed because the inlet 27 is blocked by the control element 23, so that there is no fluid connection between the inlet 27 and the outlet 29. In this state, the piston 13 can be moved into the release position, in particular when the active leaf presses the sliding block 100 against the stopper 17 due to a closing force applied, for example, by a door closer, so that a corresponding force is introduced into the piston 13.

[0028] Consequently, the first hydraulic circuit 19 has the function of extending the piston 13 with the piston rod 15 to block the closing movement of the active leaf. The second hydraulic circuit 21, on the other hand, is intended to release or control the retraction of the piston 13 with the piston rod 15. Furthermore, the second hydraulic circuit 21 has an overload mechanism which is based on a Fig.5. The opening force of the safety valve 51 is adjustable, for example, using a screwdriver or Allen key, and comprises a valve ball 53, which is pressed by a spring 55 against a valve inlet 57 in order to close it. If an attempt is now made to force the active leaf in the locked state against the holding force of the locking device 10, the safety valve 51 opens against the spring force of the spring 55 and thereby releases a bypass flow in the second hydraulic circuit 21 to prevent damage. This means that a flow takes place in the second hydraulic circuit 21 even though it is closed. The bypass flow flows around the control element 23 or the receiving bore 25.

[0029] The first hydraulic circuit 19 and the second hydraulic circuit 21 are each provided with a check valve 59, 61. The check valve 59 of the first hydraulic circuit 19 serves to prevent hydraulic oil from flowing out of the fluid chamber 35 when the first hydraulic circuit 19 is open. The check valve 61 of the second hydraulic circuit 21 prevents air from entering the fluid chamber 35 when the piston 13 and the piston rod 15 extend. List of reference symbols 10 Locking device 11 hydraulic cylinders 13 pistons 15 Piston rod 17 stoppers 18 Flange 19 first hydraulic circuit 21 second hydraulic circuit 23 Control 25 mounting hole 27 Inlet 29 Procedure 31 Inlet 33 Process 35 Fluid chamber 37 Compressed air room 38 Oil level 39 Inflow 41 Drain 43 Inflow 45 Drain 47 Deepening 49 Deepening 51 Safety valve 53 Valve ball 55 spring 57 Valve inflow 59 Check valve 61 Check valve 63 Wire rope, rod 65 closure 66 closure 67 paragraph 69 spring 100 sliding blocks 101 Slide rail

Claims

[1] Hydraulic locking device (10) for closing sequence control for a double-leaf door with a fixed leaf, a moving leaf and a sliding block (100) connected to the moving leaf, which is arranged to be movable along a sliding rail (101) in accordance with an opening angle of the moving leaf, wherein the locking device (10) comprises: - a hydraulic cylinder (11), - a piston (13) movably arranged within the hydraulic cylinder (11) between a first position and a second position, - a stopper (17) connected to the piston (13) for blocking the movement of the sliding block (100) along the slide rail (101) in a direction of movement corresponding to the closing direction of the active leaf, which stopper (17) is suitable for being arranged to be movable along the slide rail (101) between a release position corresponding to the first position of the piston (13), in which the sliding block (100) is released to close the active leaf, and a blocking position corresponding to the second position of the piston (13), in which the movement of the sliding block (100) is blocked to prevent the active leaf from closing, - a first hydraulic circuit (19), - a second hydraulic circuit (21) and - a control element (23) which can be switched between a first position and a second position depending on an opening angle of the inactive leaf and which is suitable for opening the first hydraulic circuit (19) and closing the second hydraulic circuit (21) in the first position in order to move the piston (13) hydraulically into the blocking position to move the stopper (17), and for closing the first hydraulic circuit (19) and opening the second hydraulic circuit (21) in the second position in order to move the piston (13) into the release position to move the stopper (17). [2] Locking device (10) according to claim 1, characterized by that the control element (23) is a spring-loaded control piston which is preferably pre-tensioned into the first position. [3] Locking device (10) according to claim 1 or 2, characterized bythat the control element (23) is received in a receiving bore (25) of the hydraulic cylinder (11), which is provided with an inlet (27) and an outlet (29) of the first hydraulic circuit (19) and with an inlet (31) and an outlet (33) of the second hydraulic circuit (21). [4] Locking device (10) according to one of the preceding claims, characterized by in that the hydraulic cylinder (11) has a fluid chamber (35) and a compressed air chamber (37) which are separated from one another by the piston (13), wherein a piston rod (15) of the piston (13) extends through the compressed air chamber (37) away from the piston (13), wherein the first hydraulic circuit (19) has an inlet (39) to the fluid chamber (35) and an outlet (41) from the compressed air chamber (37), and wherein the second hydraulic circuit (21) has an inlet (43) to the compressed air chamber (37) and an outlet (45) from the fluid chamber (35). [5] Locking device (10) according to claim 4, characterized byin that the outflow (41) of the first hydraulic circuit (19) is located in a lower region of the compressed air chamber (37) in the properly mounted state of the locking device (10), which in the second position of the piston (13) is preferably arranged below an oil level (38) of hydraulic oil in the compressed air chamber (37), and the outflow (45) of the second hydraulic circuit (21) is located in an upper region of the fluid chamber (35) in the properly mounted state of the locking device (10), which in the first position of the piston (13) is preferably arranged above an oil level (38) of hydraulic oil in the fluid chamber (35). [6] Locking device (10) according to one of the preceding claims, characterized by that the first hydraulic circuit (19) is located below the second hydraulic circuit (21) when the locking device (10) is mounted as intended. [7] Locking device (10) according to one of the preceding claims, characterized by that the control element (23) has a circumferential surface and is provided on the circumferential surface with two recesses (47, 49), in particular annular grooves, running in the circumferential direction of the control element (23) for releasing the first hydraulic circuit (19) or the second hydraulic circuit (21). [8] Locking device (10) according to one of the preceding claims, characterized by that a first recess (47) opens the first hydraulic circuit (19) in the first position of the control element (23) and a second recess (49) opens the second hydraulic circuit (21) in the second position of the control element (23). [9] Locking device (10) according to one of the preceding claims, characterized by that the second hydraulic circuit (21) has an adjustable safety valve (51) which, when opened, releases a bypass flow to bypass the control element (23) in the second hydraulic circuit (21). [10] Locking device (10) according to claim 9, characterized by that the safety valve (51) has a valve ball (53) which is preloaded by a spring (55) and closes a valve inlet (57), wherein the valve ball (53) can be moved away from the valve inlet (57) against the spring force in order to open the safety valve (51). [11] Locking device (10) according to one of the preceding claims, characterized by that the first hydraulic circuit (19) and / or the second hydraulic circuit (21) have a check valve (59, 61). [12] Locking device (10) according to one of the preceding claims, characterized by that the control element (23) can be controlled mechanically, in particular by means of a wire rope (63) or a rod (63), or electrically. [13] Locking device (10) according to one of the preceding claims, characterized by that a locking rod is moved into the locking position by the pressure difference on the piston (13).

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