DOOR-STRIKE

Abstract

The invention discloses a door opener for a door having a wing pivotally mounted to a door frame, said door opener comprising: a main body; a door opener latch hingedly mounted in the main body and pivotable between a closed position and an open position; a blocking member that is displaceable from a locking position into a release position and back, the blocking member in its locking position forming a stop for the door opener latch in the closed position to prevent pivoting of the door opener latch into the open position, and the blocking member in its release position being so far offset from the door opener latch that the door opener latch may be pivoted from the closed position to the open position and back without any restriction of movement by the blocking member; and an actuator coupled with the blocking member for releasing or locking the door opener latch.

The actuator comprises a motor having a rotatable shaft supporting a worm thread, and a spring member having two end portions is provided, wherein a first end portion of the spring member engages with the worm thread in order to displace the spring member linearly in the direction of extension of the rotatable shaft by rotating the worm thread, and wherein a second end portion of the spring member is coupled with the blocking member.

Claims

1. A door opener for a door having a wing pivotally mounted to a door frame, said door opener comprising: a main body; a door opener latch hingedly mounted in the main body and pivotable between a closed position and an open position; a blocking member that is displaceable from a locking position into a release position and back, the blocking member in its locking position forming a stop for the door opener latch in the closed position to prevent pivoting of the door opener latch into the open position, and the blocking member in its release position being so far offset from the door opener latch that the door opener latch may be pivoted from the closed position to the open position and back without any restriction of movement by the blocking member; and an actuator coupled with the blocking member for releasing or locking the door opener latch, wherein the actuator comprises a motor having a rotatable shaft supporting a worm thread, and a spring member having two end portions is provided, wherein a first end portion of the spring member engages with the worm thread in order to displace the spring member linearly in the direction of extension of the rotatable shaft by rotating the worm thread, and wherein a second end portion of the spring member is coupled with the blocking member.

2. The door opener according to claim 1, wherein the blocking member is mounted in a linearly displaceable main body, wherein the second end portion of the spring member is connected to the blocking member in order to displace the blocking member from the locking position to the release position and back.

3. The door opener according to claim 1, wherein the blocking member is a latch lever hingedly mounted to the main body and in the locking position forms a stop for the door opener latch in the closed position.

4. The door opener according to claim 3, wherein a locking member, which is mounted in the main body to be pivotable from an interlocking position to a release position and having the shape of a locking bolt, wherein the locking bolt shape of the locking member, in the interlocking position, forms a stop for the latch lever in the locking position, which prevents the latch lever from pivoting from the locking position into the release position.

5. The door opener according to claim 3, wherein the latch lever is spring biased by a spring that pivots the latch lever from the release position into the locking position.

6. The door opener according to claim 3, wherein the locking member is spring biased by a spring that pivots the locking member from the release position into the interlocking position.

7. The door opener according to claim 1, wherein the actuator comprises a linearly displaceable plunger which is arranged to act upon the blocking member, in order to displace the blocking member from the locking position into the release position when the plunger is moved in the direction of the blocking member, wherein the plunger is connected to the second end portion of the spring member.

8. The door opener according to claim 1, wherein the actuator comprises a linearly displaceable plunger which is arranged to act upon the locking member, in order to pivot the locking member from the interlocking position into the release position when the plunger is moved in the direction of the locking member, wherein the plunger is connected to the second end portion of the spring member.

9. The door opener according to claim 1, wherein the plunger is guided in a rotationally fixed manner.

10. The door opener according to claim 1, wherein in two end positions, the spring member does not engage with the worm thread and is no longer displaced by the worm thread upon the latter's further rotation.

11. The door opener according to claim 1, wherein the pivot axis of the door opener latch is oriented in a direction that is rotated by 90? with respect to the direction of extension of the pivot axis of the latch lever and the locking member.

12. The door opener according to claim 1, wherein in the closed position, the door opener latch protrudes beyond the outline of the main housing.

13. The door opener according to claim 1, wherein a door sensor is provided for monitoring the presence of a door lock latch.

14. The door opener according to claim 13, comprising control electronics, wherein the door sensor and the actuator are coupled with the control electronics and in that the control electronics for driving the actuator is configured to transfer the blocking member into the release position in the presence of a door release signal and to bring the blocking member back into the locking position, once the absence of the door lock latch is detected by the door sensor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The invention will be explained in more detail below by means of exemplary embodiments together with the accompanying drawings. In these:

[0032] FIG. 1 illustrates a top view of a first embodiment of a door opener in a closed position;

[0033] FIG. 2 illustrates the door opener of FIG. 1 in an open position;

[0034] FIG. 3 illustrates a partial sectional view of the door opener of FIG. 3 showing the spring member with plunger;

[0035] FIG. 4 illustrates a partial sectional view of the door opener of FIG. 2 showing the spring member with plunger;

[0036] FIG. 5 illustrates a sectional side view of the door opener of FIG. 1 in the closed position along section A-A;

[0037] FIG. 6 illustrates a partial sectional view of the door opener of FIG. 1 along section B-B;

[0038] FIG. 7 illustrates a side view of the opened door opener of FIG. 2;

[0039] FIG. 8 illustrates a side view of the door opener of FIG. 2 along section A-A;

[0040] FIG. 9 illustrates a side view of the door opener of FIG. 2 along section B-B;

[0041] FIG. 10a) illustrates a sectional view of the electric motor with worm thread, spring member, and plunger in the resting position;

[0042] FIG. 10b) illustrates a sectional view of FIG. 10a) with the plunger in the unlocked position;

[0043] FIG. 11 illustrates a second embodiment of the door opener with a linearly displaceable blocking member in the closed position;

[0044] FIG. 12 illustrates a top view of the door opener of FIG. 11 in an unlocked open position;

[0045] FIG. 13 illustrates a top view of the door opener of FIG. 12 in the open position with the door opener latch in the pivoted position;

[0046] FIG. 14 illustrates a sectional side view of another embodiment of a door opener in a closed position;

[0047] FIG. 15 illustrates a side view of the door opener of FIG. 14 in the closed position;

[0048] FIG. 16 illustrates a front view of the door opener of FIG. 14 in the closed position with blocked door opener latch;

[0049] FIG. 17 illustrates a partial sectional front view of the door opener of FIG. 16 in the closed position with blocked door opener latch;

[0050] FIG. 18 illustrates a partial sectional top view of the door opener of FIG. 16 in the closed position with blocked door opener latch;

[0051] FIG. 19 illustrates a sectional side view of the door opener of FIG. 14 in an open position;

[0052] FIG. 20 illustrates a side view of the door opener of FIG. 19 in the open position;

[0053] FIG. 21 illustrates a front view of the door opener of FIG. 19 in the open position with blocked door opener latch;

[0054] FIG. 22 illustrates a partial sectional front view of the door opener of FIG. 21 in the open position with blocked door opener latch;

[0055] FIG. 23 illustrates a partial sectional top view of the door opener of FIG. 21 in the open position with blocked door opener latch.

DETAILED DESCRIPTION OF THE INVENTION

[0056] FIG. 1 illustrates a top view of a door opener 1 in a first exemplary embodiment. The door opener 1 comprises a main body 2, which, for example, may have a metal housing. A plurality of movably arranged functional elements is installed within this main body 2. A door opener latch 3 (also known as a swing bolt) is pivotally disposed about the pivot axis S1 for locking the door bolt of a door, the pivot axis extending horizontally in the figure.

[0057] Furthermore, an unlocking mechanism comprising a latch lever 4 is provided. The latch lever 4 is pivotally hinged about the axis S2 within the main body 2. In the illustrated closed position of the door opener latch 3, the latch lever 4 forms a stop for the door opener latch 3 and causes the door opener latch 3 to pivot from the closed position into the open position.

[0058] It is thus apparent that there is a positive lock between the latch lever 4 pivoted into the illustrated locking position and the door opener latch 3 in the closed position.

[0059] It can be seen that the latch lever 4 is spring biased by means of a first biasing spring member 5, which brings the latch lever 4 in the illustrated locking position when the latch lever 4 is able to move freely.

[0060] The unlocking mechanism is further provided with a locking member 6 pivotally hinged to the main body 2. Said member is positioned at the main body 2 to be pivotable about the pivot axis S3, in order to move from the illustrated interlocking position into a release position to the left against the force of a second biasing spring member 7.

[0061] It can be seen that a plunger 8 acts upon and may be in contact with an actuation surface of the locking member 6. In the illustration of FIG. 1, the plunger 8 is linearly displaceable in the horizontal direction from left to right and back.

[0062] The plunger 8 may be rotationally fixed, so as to not rotate when moving linearly. However, this is merely optional. For this purpose, the plunger 8 may, for example, have a groove 9, which a fixing pin engages with, in order to prevent, by forming a positive lock, a rotation of the plunger 8 about the axis in its direction of extension, that is, about the axis S4 indicated by a dashed line, when the plunger 8 is displaced in the linear direction.

[0063] It is apparent that the locking member 6 has the shape of a locking bolt, for example as a dent-like recess formed by protruding stop faces or the like, for instance, in order to form a stop for the latch lever 4 in the interlocking position. Thus, the locking member 6 extends, for example, over the free end of the latch lever 4 with its locking bolt shape in order to thereby form a positive lock with the latch lever 4 and hold it in the locking position. Therefore, pivoting the latch lever 4 is prevented in the interlocking position of the locking member 6.

[0064] The latch lever 4 and the locking member 6 are spring biased by the first biasing spring member 5 and the second biasing spring member 7, which move the latch lever 4 into the locking position and the locking member 6 into the interlocking position. In this manner, a permanent position, for example, in the permanently closed operation (locking position of the blocking member) is set, where the door opener 1 automatically secures the door opener latch 3 in the closed position with the plunger 8 retracted and thus securely closes the door. This permanently closed operation and conversely, with the inverse arrangement of the springs, a permanently open operation (release position of the blocking member), can be ensured to improve reliability, if a retracted position of the plunger 8 is ensured even in the case of an actuator failure. An imminent failure may, for example, be detected by means of an emergency energy store, such as a capacitor, or by monitoring the available residual battery power.

[0065] The plunger 8 is linearly displaced by means of an actuator, not shown, for example, in the form of an electric motor, which may be driven via an electric line 11 and a control unit, which is not shown. However, it is also contemplated that a battery is housed within the main body 2 or on the main body 2, for example, in a battery compartment, with additional control electronics, if necessary.

[0066] The control electronics may be integrated with a battery-powered control unit (e.g. a reader) located adjacent to a door, said control unit comprising one or more of a keypad for entering pin codes, a radio unit for scanning a transponder or a smartphone (for example via RFID, NFC, Bluetooth, ZigBee, WiFi etc.), and a biometric input unit (e.g. iris or fingerprint). The battery of the control unit may be used for supplying the actuator of the door opener. A state signal (door open in case of absence of the lock latch in the door opener latch or door closed in case of presence of the lock latch locked by the door opener latch) detected by means of a door sensor of the door opener may be transmitted to the control unit and from there to a central station (event signal). From the central station or from another release point via the central station or directly via the control unit, an open signal may be transmitted to the door opener for activating the actuator and displacing the blocking member into the open position (opening signal).

[0067] FIG. 2 illustrates the door opener 1 of FIG. 1, here with the door opener latch 3 pivoted into the open position. It can be seen that the door opener latch 3 may be arranged on the main body 2 by means of adjusting screws 12a, 12b, such that the contact pressure of a door in the closed position onto the door opener latch can be adjusted when there is a positive lock of the door opener latch with the door bolt.

[0068] It can be seen that the latch lever 4, in the illustrated open position, is now pivoted away from the door opener latch 3 into the release position. In doing so, the latch lever 4 is pivoted about the pivot axis S2 against the spring force of the first biasing spring member 5 in a clockwise direction. This is possible, because the locking member 6 is now pivoted about its pivot axis S3 away from the latch lever 4 in a counterclockwise direction, that is, against the pivot direction of the latch lever 4. This pivoting motion of the locking member 6 from the interlocking position into the release position is caused by the plunger 8, which the actuator has displaced linearly towards the locking member 6.

[0069] The linear motion of the plunger 8 thereby unlocks the locking member 6 and unlocks the door opener 1, such that a door coupled with the door opener 1 may be opened.

[0070] A door sensor 29 monitoring the presence of the door lock latch behind the door opener latch 3 in the locked position is disposed adjacent to the door opener latch 3. Here, the sensor may be an interior push-button (not shown) (e.g., a micro switch) positioned behind the illustrated plate or a plunger. If the door lock latch rests on the plate or the plunger, it will be displaced by the force applied thereon and will actuate the push-button behind it. The push-button and the cooperating plate or plunger may be brought into the initial position by means of a spring, which position is reached in the absence of the door lock latch. The door sensor 29 may be used to signal the closed or open state of the door according to the presence of the door lock latch. It may also be used to cause the door opener 1 to switch from the open position into the closed position, once the absence of the door lock latch has been detected after an opening operation.

[0071] FIG. 3 shows a partial section of the door opener 1 of FIG. 1 in the closed position of the door opener latch 3. It can be seen that the plunger 8 is coupled with an actuator spring member 13. For this purpose, the second end portion 14a of the actuator spring member 13 is fixedly connected to the plunger 8. For example, the actuator spring member 13 may be wound with its second end portion 14a coils about the outer periphery of the plunger 8 to form a frictional and positive lock with the plunger 8. The first end portion 14b of the actuator spring member 13 engages with the worm thread 15, which is disposed on the drive shaft 16 of an actuator that is not shown. The worm thread 15 is disposed to be rotatable about an axis S4.

[0072] In the illustrated interlocking position of the locking member 6, the first end portion 14b is displaced away from the locking member 6 towards the actuator (to the right in FIG. 3). This is achieved by guiding spring coils of the first end portion 14b of the actuator spring member 13 on the worm thread and thus linearly displacing them into the direction of extension of the axis S4.

[0073] FIG. 4 shows a partial sectional view of the door opener 1, now in the open position of the door opener latch 3 of FIG. 2. It can be seen that the first end portion of the actuator spring member 13 is displaced horizontally to the left on the worm thread 15. Thereby, the opposing second end portion 14a of the actuator spring member 13 is also linearly displaced together with the connected plunger 8 towards the locking member 6. The spring force of the actuator spring member 13 pivots the locking member about its pivot axis S2 against the force of the second biasing member 7 from its interlocking position of FIG. 3 into the release position shown here. This releases the positive lock with the latch lever 4, such that the force acting onto the door opener latch 3 pivots the latch lever 4 away from the door opener latch 3 upwards against the spring force of the first biasing spring member 5.

[0074] FIG. 5 depicts a sectional side view of the door opener 1 of FIG. 1 along section A-A marked therein. It is apparent that the door opener latch 3, in the illustrated closed position, is oriented approximately parallel to the side wall, where the door opener latch 3 is pivotally arranged and protrudes from.

[0075] It is further apparent that the second biasing spring member 7 biases the locking member 6 in the direction of view, the member engaging with the latch lever 4. The locking member 6 thus extends over the latch lever 4.

[0076] In the illustrated example embodiment, the locking member 6 is embodied in the shape of an L and includes an actuation portion 17 pointing away from the door opener latch 3. Thus the plunger 8 may act upon the locking member 6 in a region adjacent to the latch lever 4.

[0077] It will also be apparent that the main body 2 may be closed with a cover member 18 that may be mounted above the pivotally arranged door opener latch 3 on the side of the door opener latch 3. This cover member 18 is not present in the partially open representations of FIGS. 1 to 4, that is, it has been removed in these illustrations.

[0078] FIG. 6 depicts a sectional side view of the door opener 1 of FIG. 1 in the closed position along section B-B. It will be apparent that the latch lever 4 forms a stop for the door opener latch 3 mounted to be pivotable about the pivot axis S1, where the latch lever 4 is pivoted towards the door opener latch 3.

[0079] The actuator 20 is disposed next to the latch lever 4 with an actuator housing 21, which accommodates the actuator spring member 13, the plunger 8, and the worm thread 15 with the electric motor. It will be apparent that the actuator housing 21 has an opening with groves 22 in which to guide the plunger 8 in a rotationally fixed manner. For this purpose, the plunger 8 may be provided with protrusions with which to engage these grooves 22. However, the inverse solution is also contemplated, where the plunger 8 is provided with at least one groove, with which a protrusion for rotationally fixed guidance engages.

[0080] FIG. 7 illustrates a side view of the door opener 1 in the open position of FIG. 2. It is apparent that the door opener latch 3 is pivoted by 90? about the axis S1, in the direction of view of FIG. 7 counterclockwise. The door opener latch 3 is therefore in the open position and releases a previous stop for the door bolt of a door lock. Then the door may be opened by pivoting.

[0081] FIG. 8 shows a section of the door opener 1 of FIG. 7 in the open position along section A-A. It will be apparent that the latch lever 4 has been pivoted upwards away from the door opener latch 3. This becomes possible, because the locking member 6 has been pivoted towards the viewer in the viewing direction of FIG. 8 and has released the stop for the latch lever 4. This is caused by linearly displacing the plunger 8, which acts upon the actuation surface 17 of the locking member 6.

[0082] FIG. 9 shows a section of the door opener 1 of FIG. 2 in the open position along section B-B. Here, it becomes even more apparent that the door opener latch 3 has been pivoted by 90? about its pivot axis. For this purpose, the latch lever 4 is pivoted upwards and away from the door opener latch 3, such that the door opener latch 3 may be pivoted from the closed position into the open position and back without any restriction of movement by the latch lever 4.

[0083] The actuator 20 is accommodated in the remaining space within the main body 2, such that the actuator housing 21 does not impede the movement of the door opener latch 3.

[0084] The basic design of the actuator 20 is exemplified in FIGS. 10a) and 10b). Here, FIG. 10a) depicts the actuator 20 in the resting position, where the plunger 8 is completely or largely retracted into the actuator housing 21. This is achieved by displacing the first end portion 14b of the actuator spring member 13 linearly towards the electric motor 23, in the viewing direction to the right. This is done by rotating the worm thread 15 by means of the drive shaft 16 of the electric motor 23 upon activating the electric motor 23. This linearly displaces the spring coils in the first end portion 14b engaged with the worm thread 15 towards the electric motor 23, and the actuator spring member 13 is released towards the second end portion 14a with the plunger 8. This causes a linear displacement of the plunger 8 into its resting position towards the electric motor 23.

[0085] In the illustrated example embodiment, it is apparent that the plunger 8 has a groove 9 with which a guide pin 24 engages. Therewith, the plunger 8 is mounted to the actuator housing 21 in a rotationally fixed manner, but such that it may be displaced from left to right in the direction of view.

[0086] FIG. 10b) illustrates the actuator 20 in the unlocked position. Here, the plunger 8 is linearly pushed out of the actuator housing 21. Die resting end position and the unlocked end position may be preset by the length of the groove 9 and the guide pin 24.

[0087] It is apparent that the first end portion 14b of the actuator spring member 13 does not engage with the worm gear 15 in the illustrated end positions, such that the worm thread 15 may rotate freely when the electric motor 23 rotates. Therefore, the electric motor 23 only has to be activated sufficiently long to reach at least the end position. Thereafter, the electric motor 23 may further freewheel without requiring much power or force. In this way, extensive calibration for the activation phase of the electric motor 23 is not required.

[0088] In the illustrated unlocking position, the first end portion 14b is linearly displaced to the left on the worm thread 15, where the spring coils engaging with the worm thread 15 by means of a positive lock with the worm thread 15 are linearly displaced on the thread turns.

[0089] FIG. 11 shows a partial sectional view of a second embodiment of a door opener 1. Again, the door opener latch 3 is pivotally mounted to a main body 2. In this embodiment, a blocking member 30 is disposed on the main body 2 such that it can be linearly displaced along the axis S4, that is, in the viewing direction of FIG. 11 horizontally from left to right.

[0090] In the illustrated closed position, the blocking member 30 forms a stop for the closed door opener latch 3. The blocking member 30 may be connected with the plunger 8 of the actuator 20 in a direct manner, as illustrated, or indirectly (not shown). The plunger 8 is in the resting position and is again indirectly coupled to the electric motor 23 via the actuator spring member 13. In this regard, reference is made to the illustrations of FIGS. 10a) and 10b).

[0091] FIG. 12 depicts a partial sectional view of the door opener 1 of FIG. 1, now in the unlocked position of the blocking member 30. Here, the blocking member 30 is displaced away from the stop position in positive lock with the door opener latch 3 by linearly displacing the plunger 8. This is achieved by rotating the worm thread 15, which linearly displaces the driving spring member 13 and thus the plunger 8.

[0092] In the case, where the actuator spring member 13 has been brought into the illustrated unlocked position, but the door opener latch 3 still exerts a force onto the blocking member 30 via the positive lock, the blocking member 30 may still be in the locking position of FIG. 11. However, when the contact pressure onto the blocking member 30 is temporarily relieved for a short period of time, the force of the actuator spring member 13 may bring the blocking member 30, which is mounted linearly displaceable within the main body 2, into the unlocking position. Therefore, the actuator spring member 13 serves as a store of energy.

[0093] FIG. 13 illustrates the door opener 1 of FIG. 12 in the open position of the door opener latch 3, which has been pivoted by 90? from the closed position of FIGS. 11 and 12 into its open position. This is possible, because the blocking member 30 has been guided outside of the range of motion of the door opener latch 3.

[0094] A door sensor 29 may be present in this embodiment as well. In this regard, reference is made to the description of FIG. 2.

[0095] FIG. 14 illustrates a sectional side view of another embodiment of a door opener 1 in the closed position. It is apparent that the door opener latch 3 protrudes to the right into the lock latch (not shown) accommodating space, which is open towards the front, the door opener latch forming a stop for the lock latch. The door opener latch 3 is disposed at one end of a latch pivot arm 25, to form an integral metal part, for example. The latch pivot arm 25 is mounted to a pivot axis S5 in such a way that it may be pivoted about this pivot axis S5. Preferably, two latch pivot arms 25 are provided adjacent to each other in the viewing direction and mounted together onto the pivot axis S5.

[0096] A latch return spring 26 is connected to the latch pivot arm 25 and formed such that the spring force pivots the door opener latch 3 into the illustrated closed position.

[0097] A blocking member 30 is disposed linearly displaceably by means of an actuator 20 in the main body 2, such that the blocking member 30, in the closed position, forms a stop for the latch pivot arm 25. It will be apparent that the blocking member 30 is positioned to the left behind the latch pivot arm 25, in order to prevent pivoting the latch pivot arm 25 (in the figure in the counterclockwise direction) in the direction of the back wall of the main body 2 opposite the open accommodating space. Thus, the door opener latch 3 cannot be displaced into the open position.

[0098] FIG. 15 illustrates a side view of the door opener 1 of FIG. 14 in the closed position. It can be seen that the door opener latch 3 protrudes slightly from the face of the open accommodating space. However, this is optional and not mandatory. The pivot axis S5 for the latch pivot arm 25 is also illustrated.

[0099] FIG. 16 illustrates a front view of the door opener 1 of FIG. 14 in the closed position with blocked door opener latch 3. Here it is apparent that there are two latch pivot arms 25 spaced apart from each other that are each integrally connected to the door opener latch 3 at their respective ends. The door opener latch 3 extends at a distance to the pivot axis S5, to which the latch pivot arms 25 are pivotally mounted, between the two latch pivot arms 25. Thereby, a lock bolt may reach under the door opener latch 3, such that the door opener latch 3 forms a stop for the lock bolt.

[0100] In the illustrated example embodiment, a torsion spring (also known as torsional spring) is disposed on the pivot axis S5 to form the latch return spring 26. One spring arm of the latch return spring 26 is in positive lock with an associated latch pivot arm 25, such that the latter is pivoted into the closed position by the spring force. Optionally, a plurality of latch return springs 26 may be provided, for example, another torsion spring connected to the other latch pivot arm 25.

[0101] An actuator 20 is disposed within the main body 2. Here, the technology illustrated in FIG. 10 may be employed, for example. The actuator 20 is connected to a slide 27, which supports the blocking member 30 on at least one side. By linearly moving the slide 27 (in the horizontal direction in the viewing direction of FIG. 16), the blocking member 30 may be positioned behind the associated latch pivot arm 25 to form a stop preventing a pivot into the open position, or may be moved outside of the range of motion of the associated latch pivot arm 25.

[0102] FIG. 17 illustrates a partial sectional front view of the door opener 1 of FIG. 16 in the closed position with blocked door opener latch 3. This shows the example design of the actuator 20 in more detail. The actuator 20 comprises an electric motor which drives a drive shaft having a worm thread 15. A first end portion 14b of an actuator spring member 13 is in positive lock with the worm thread 15, such that the end portion 14b is horizontally displaced upon rotation of the worm thread 15. With the movement (in the illustrated viewing direction to the left), the actuator spring member 13 is tensioned and exerts a force onto the slide head portion 28 of the slide 27 that is coupled with the second end portion 14a of the actuator spring member 13. The slide head portion 28 may, for example, protrude into the interior space of the actuator spring member 13, which thereby encloses the slide head portion 28 in its front portion. The actuator spring member 13 tensioned by the spring force now exerts a force onto the slide 17 through the slide head portion 28, which linearly displaces the slide 27 with its at least one blocking member 30, once the force exerted by a lock bolt via the door opener latch 3 onto the latch pivot arms 25 and the blocking members 30 abutting thereto becomes smaller than the spring force of the actuator spring member 13. The biasing of the actuator spring member 13 for opening the door opener latch 3 prepares the linear movement of the blocking members 30, in order to enable the door opener latch 3 to be pivoted into the open position. The linear motion requires an instance, where force is no longer applied onto the door opener latch 3, that is, where the door locked with the lock bolt is not being pushed or pulled.

[0103] Once the stop is released by moving the blocking members 30 out of the range of motion of the latch pivot axes 25, the door opener latch 3 may be pivoted into the open position against the spring force of the latch return spring 26. This may be achieved by pivoting a door to open it, the door being in the locked state with a protruding lock bolt. In doing so, the lock bolt exerts a force onto the now freely movable door opener latch 3, which moves the door opener latch 3 into the open position. After opening the door, the door opener latch 3 pivots back into the closed position under the force of the latch return spring 26. The lock bolt may be pushed back by an inclined face facing the door opener 1 in the usual manner when closing the door when said face hits the door opener latch 3 in the closed position, such that the bolt is guided past the door opener latch 3. After overcoming the door opener latch 3, the lock bolt snaps out again in order to engage under the door opener latch 3.

[0104] FIG. 18 illustrates a partial sectional top view of the door opener of FIG. 16 in the closed position with blocked door opener latch 3. It will now be apparent that the blocking members 30 are positioned in the pivot space of the associated latch pivot arms 25 to form a stop for the latch pivot arms 25. This prevents that the latch pivot arms 25 pivot into the open position together with the door opener latch 3.

[0105] FIG. 19 depicts a sectional side view of the door opener 1 of FIG. 14 in the open position. It will be apparent that the latch pivot arms 25 are now pivoted towards the back of the main body 2 (in the Figure in the counterclockwise direction). Thereby the door opener latch 3 is displaced away from the open accommodating space at the front of the main body 2, in order to clear an upwards path for a lock bolt. In the sectional view, the blocking member 30 is disposed in the cutout area at the front in the direction of view for the visible latch pivot arm 25, such that the blocking member is not shown. However, it will be apparent that the slide 27, at the end of which the blocking member 30 is disposed, passes between the backside of the main body 2 and the latch pivot arm 25. The slide 25 is displaced linearlyin the view of FIG. 19 in the direction of viewby means of the actuator 20.

[0106] The latch return spring 26 is also visible, which is disposed on the latch pivot axis S5 with one spring arm engaging with a lateral groove of the associated latch pivot arm 25. This realizes a positive lock between the latch pivot arm 25 and the latch return spring 26.

[0107] FIG. 20 illustrates a side view of the door opener 1 of FIG. 19 in the open position. Here, the main body 2 with the latch pivot axis S5 is visible. The door opener latch 3 is pivoted towards the backside of the main body 2 in the open position and therefore no longer visible.

[0108] FIG. 21 depicts a front view of the door opener 1 of FIG. 19 in the open position with blocked door opener latch 3. It will be apparent that the blocking members 30 disposed on the slide 27 are displaced linearly (to the left in the Figure). Therefore, the blocking members 30 are positioned laterally adjacent to the pivot range of the associated latch pivot arms 25, such that the latch pivot arms 25 may be freely pivotedagainst the force of the latch return spring 26.

[0109] FIG. 22 illustrates a partial sectional front view of the door opener 1 of FIG. 21 in the open position with blocked door opener latch 3. For the design of the actuator reference may be made to the embodiments of FIGS. 10 and 17. It will be apparent that the first end portion 14b of the actuator spring member 13 on the worm thread 15 is displaced linearly, by its rotation, away from the electric motor along the drive shaft 16. The spring force of the actuator spring member 13 embodied as a compression spring pushes the slide head portion 28 attached at the second end portion 14a away from the electric motor and linearly displaces the slide 27, such that the blocking members 30 connected thereto move outside the pivot range of the latch pivot axes 25.

[0110] FIG. 23 illustrates a partial sectional top view of the door opener 1 of FIG. 21 in the open position with blocked door opener latch 3. Here, reference may essentially be made to the embodiments of FIG. 18. It will be apparent that the blocking members 30 are positioned laterally adjacent to the associated latch pivot arms 25. Here, the latch pivot arms 25 are pivoted into the now cleared pivot range into the open position towards the backside of the main body.

LIST OF REFERENCE NUMERALS

[0111] 1 door opener [0112] 2 main body [0113] 3 door opener latch [0114] 4 latch lever [0115] 5 biasing spring member [0116] 6 locking member [0117] 7 second biasing spring member [0118] 8 plunger [0119] 9 groove [0120] 11 electric line [0121] 12a, 12b adjusting screws [0122] 13 actuator spring member [0123] 14a second end portion [0124] 14b first end portion [0125] 15 worm thread [0126] 16 drive shaft [0127] 17 actuation portion/actuation surface [0128] 18 cover member [0129] 20 actuator [0130] 21 actuator housing [0131] 22 grooves [0132] 23 electric motor [0133] 24 guide pin [0134] 25 latch pivot axe [0135] 26 latch return spring [0136] 27 slide [0137] 28 slide head portion [0138] 29 door sensor [0139] 30 blocking member [0140] S1 pivot axis [0141] S2 latch lever axis [0142] S3 pivot axis [0143] S4 axis [0144] S5 pivot axis for latch pivot arm