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The invention refers to a door or window locking device intended for installation into a door wing frame or window wing frame, and in particular into a narrow frame made, e.g., of aluminum or plastic profiles, or into a door wing itself, said locking device comprising a translational bolt displaceable with a bit of a lock cylinder through corresponding linkage into a door or window post, and vice versa.
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A locking device mentioned in the foregoing is generally well known, cf. e.g. catalogues of the companies WELKA or CORBIN. In this case a bolt is driven directly by a bit of a lock cylinder. Closing stroke and opening stroke of the bolt, respectively, are here achieved by one or several rotations of a key, and the stroke of the bolt does not exceed 22mm in any case. When the locking device is locked by one rotation of the key only, the stroke of the bolt does not even exceed 17mm. There is, however, a need for a bolt to have a stroke of at least 25mm, said stroke is to be achieved by one rotation of the key only.
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Known are solutions where a stroke of the bolt greater than 22mm is achieved. In one of such solutions the bolt is swung about the axis of rotation inside a device; hence, the motion thereof is not a translation. In another solution the translational bolt is driven over an intricate set of gear wheels. Solutions of such a kind need greater clearance between a lock cylinder and a bolt, which results in relatively greater proportions of locking devices.
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The aim of the invention is to create such a door and window locking device, respectively, of the above mentioned kind that the necessary, relatively great stroke (at least 25mm) of the bolt is achieved by a single rotation of the key.
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According to the invention the task as set is solved by a bolt, which is slidingly movably arranged between a flat slider and a coupling link, said slider, to which presses one leg of a return spring, is guided so as to be moved only perpendicularly to the direction of the path of the bolt, and the coupling link is guided in a manner so as to move only in the same direction as the bolt itself, and the bolt is articulated with a swing arm arranged between the flat slider and the coupling link.
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Said bolt is formed in the area of its front end, i.e. the end which projects out of the housing of the locking device by a rectangular blocking notch extending transversely, said notch being intended for mating with a tooth of a sliding bar. In the area of its other end the bolt is formed with an oblong hole extending in the direction of motion of the bolt. On one hand, the latter is guided in the housing by means of a through hole in a head-on bar, and on the other hand it is guided by a pilot arranged perpendicularly to the housing and, rigidly connected therewith, said pilot cooperates with the oblong hole. In this second area and under the notch there are arranged perpendicularly to the bolt both a pivot and a through pin. Said through pin penetrates the bolt and projects through to the other side. A swing arm is allowed the access to the thinner area of the bolt where there are arranged the pivot and the through pin and a part of the notch.
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The slider is essentially formed by two diagonally running oblong holes extending perpendicularly to the direction of motion of the bolt and by a U-shaped cutout the legs thereof extending in the same direction as said oblong holes. On one hand, the slider is guided by two pilots set perpendicularly to the housing and rigidly connected therewith, said pilots mating with the oblong holes and, on the other hand, it is guided by the through pin of the bolt mating with the U-shaped cutout. A return spring mounted on the pilot and arranged under the swing arm presses with one of its legs onto a top edge of the slider, and with the other leg it rests against the wall of the housing.
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In the area of each end thereof the oblong swing arm comprises an oblong hole, one for each end, said notch extending alongside the direction of the shape of the swing arm, and in the middle part said arm comprises a through bore. The swing arm is three-point guided, i.e. by the pilot cooperating with the first oblong hole, the pivot of the bolt cooperating with the second oblong hole and the pivot of the coupling link cooperating with said through bore. The longitudinal axis of the oblong hole of the swing arm cooperating with the pivot is out of alignment with the system axis, i.e., the longitudinal axis of the swing arm; it is rather swung out of the course of said system axis so that the intersection of the longitudinal axis of the second oblong hole and the system axis of the swing arm is located on that end of the swing arm averted towards the bolt.
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In the area under a pivot the coupling link is formed by an oblong hole and below said notch it is formed by an oval-shaped pivot. Lengthwise, spaced from the latter, there is formed another oval-shaped pivot, both pivots being arranged on the same flat side of the coupling link, and the pivot is formed on the other side. The bottom edge of the coupling link is formed with a groove intended for cooperation with a bit of a lock cylinder.
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The coupling link is guided by the oval-shaped pivots in the cutout of a cover of the housing and by the oblong hole on the pivot of the bolt.
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In the device according to the invention the coupling link is driven directly by a bit of a lock cylinder where movement of the bit is transmitted to the bolt by means of a linkage having a relatively high leverage ratio. Therewith, an essentially greater stroke of the bolt is rendered possible than is the one of the coupling link driven by the bit of a lock cylinder.
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The invention is further described on the basis of the example shown in the accompanying drawings where
- Fig. 1
- shows a locking device according to the invention in open, i.e. unlocked state, with partially removed cover of a housing;
- Fig. 2
- shows a section along the line II-II of Fig. 1;
- Fig. 3
- shows the locking device as in Fig. 1 but in closed, i.e. locked, state;
- Fig. 4
- shows a bolt of the locking device according to the invention;
- Fig. 5
- shows a plan view of a slider of the locking device according to the invention;
- Fig. 6
- shows a plan view of a swing arm of the locking device according to the invention;
- Fig. 7
- shows a coupling link of the locking device according to the invention.
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A locking device according to the invention has a housing 1 comprising two mechanisms arranged practically in a plane. The first one is a mechanism known per se for closing and opening, e.g. a door, generally placed in the upper part of the housing 1. Said first mechanism comprises a latch bolt 2 which is translationally moved by operating a handle, not shown, by means of a follower 3 and a flat lever system 4.
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The second mechanism, i.e. the mechanism for locking and unlocking, e.g., a door, which in present case is the object of the invention, is generally placed in the lower part of the housing 1. Said second mechanism comprises a bolt 5 shaped essentially as a rectangular plate and slidingly movably arranged between a flat slider 6 and a coupling link 7. In Fig. 1 the slider 6 is shown with a dashed line and is arranged under the bolt 5, said slider 6 sliding over one of the flat walls of the housing 1 when operating the device, the coupling link 7 being arranged above the bolt 5. Said second mechanism further comprises a swing arm 8, a return spring 9 being placed thereunder pressing by one of its legs onto a top edge 6' of the slider 6. Thereby the swing arm 8 with one of its ends projects into the area between the slider 6 and the coupling link 7.
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The housing 1 is equipped with several pins formed with an internal thread onto which a cover of the housing is fastened by means of a screw set (in Figs. 1 and 3 shown as a cutaway part of a cover 1' and a head of a screw). Moreover, in the lower half and in the area of said second mechanism the housing 1 is formed with three pilots 10, 11,12 arranged perpendicularly to said wall and the cover 1'. In the area of the lowermost end the housing is formed with a through hole 13 adapted and intended for accommodation of a lock cylinder not shown.
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As is evident from Fig. 4, the bolt 5 is in the area of its front end, i.e., the end projecting out of the housing 1 of the locking device, formed with a rectangular, transversely extending blocking notch 14. A tooth, not shown, of a sliding bar 15 grips into the blocking notch 14 when the locking device and the bolt 5, respectively, are in position open. When the locking device and the bolt 5, respectively, are in position closed, said tooth of the sliding bar 15 abuts against the bottom front surface of the bolt 5, consequently, unlocking of the locking device is rendered impossible. In the area of its second end the bolt 5 is formed with an oblong hole 16 extending lengthwise, i.e., in the direction of motion of the bolt 5. In the housing 1, said bolt 5 is, on one hand, guided by a through hole (not shown) in the head-on bar 17 and, on the other hand, guided by the pilot 10 cooperating with the oblong hole 16. In the same area, but under the notch 16, there are perpendicularly to the bolt 5 also arranged a pivot 18 and a through pin 19. The latter penetrates the bolt 5 and projects out on the other side. The area of the bolt 5 where there are arranged the pivot 18 and the pin 19 and part of the notch 16 comprises approximately half of a thickness of said bolt when observed along its thickness, therefore, the swing arm 8 is allowed access into this area.
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Fig. 5 shows the slider 6 formed essentially by two diagonally running oblong holes 20, 21 extending perpendicularly to the direction of motion of the bolt 5, and by an U-shaped cutout 22 the legs thereof extending into the same direction as said notches 20, 21. On one hand the slider 6 is guided by two pilots 10, 11 arranged perpendicularly to the housing 1 and rigidly connected therewith, said pilots 10, 11 mating the notches 20, 21 of the slider, and on the other hand by the through pin 19 mating with the U-shaped cutout 22. The return spring 9 mounted onto the pilot 12 and arranged under the swing arm 8 presses with one of its leg onto the top edge 6' of said slider and abuts against the wall of the housing 1 with its other leg.
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Fig.6 shows an oblong swing arm 8 comprising in the area of its each end an oblong hole 23, 24, one at each end, and a through bore 25 in the middle area. The swing arm 8 is three-point guided, i.e. by the pilot 12 cooperating with the oblong hole 23, the pivot 18 of the bolt cooperating with the oblong hole 24 and the pivot 26 of the coupling link cooperating with through bore 25. The longitudinal axis of the oblong hole 24 of the swing arm 8 cooperating with the pivot 18 is out of alignment with the system axis, i.e. the longitudinal axis of the swing arm; it is rather swung out of the course of said system axis. Thereby the intersection of the longitudinal axis of the oblong hole 24 and of the system axis of the swing arm 8 is located on that end of the swing arm 8 averted towards the bolt 5.
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Fig. 7 shows a coupling link 7. It is in the area under the pivot 26 formed with an oblong hole 27 and thereunder formed with an oval-shaped pivot 28. Lengthwise, spaced from the latter, there is formed another oval-shaped pivot 29, both pivots 28, 29 being arranged on the same flat side of the coupling link 7, the pivot 26 being formed on the other side. The bottom edge 7' of the coupling link is formed with a groove 30 intended for cooperation with a bit of a lock cylinder not shown. The coupling link 7 is guided by the oval-shaped pivots 28, 29 in the cutout 31 of a cover 1' of the housing and by the oblong hole 27 on the pivot 18 of the bolt.
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The mechanism according to the invention is assembled as follows. First, onto the pilots 10, 11 in the housing 1 there is mounted the slider 6, said pilot 10 inserted into the oblong hole 20 and projecting out of it, said pilot 11 being inserted into the oblong hole 21, but not passing through out in any case. Afterwards the return spring 9 is mounted onto the pilot 12 abutting against the wall of the housing 1 with the first leg thereof and pressing onto the top edge 6' of the slider with the second leg thereof. Subsequently, the bolt 5 is inserted so as to abut against the slider 6, the oblong hole 16 mating with the pilot 10 and the through pin 19 mating with the U-shaped cutout 22 of the slider 6. Further, the swing arm 8 with the oblong holes 23, 24 is mounted onto the pilot 12 and the pivot 18 of the bolt. On one hand, the swing arm 8 abuts against the return spring 9 and, on the other hand, it abuts against the bolt 5. The step of the bolt 5 and the thickness of the swing arm, respectively, are formed so that the top faces of the bolt 5 averted towards the cover 1' and the swing arm 8 are in alignment regarding the face, i.e., they lie in the same plane. Over the bolt 5 and the swing arm 8 the coupling link 7 is placed in a manner that the pivot 26 thereof rests against the oblong hole 27 of said coupling link, and the oval-shaped pivots 28, 29 rest against the cutout 31 of the cover 1' of the housing when said cover is fixed to the housing.
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In present case, the bolt 5 is made of bent sheet metal, both bent shanks abutting against each other and permanently fixed by cold press method. Said bolt could be made of one piece, e.g., it could be forged or cast. The slider 6, the coupling link 7 and the swing arm 8 are either made of sheet metal, are forged or cast.
The door and window locking device, respectively, according to the invention operates in the following way. Rotating a key in a lock cylinder brings about shifting of the bolt 5 from the position open (Fig. 1) into the position closed (Fig. 3). When rotating the lock cylinder, a bit thereof at first reaches the bottom edge 6'' of the slider 6, which is pushed by means of the bit of the lock cylinder at continuing the rotation into the longitudinal direction of the device, i.e., the direction parallel to the sliding bar 15 and head-on bar 17. The slider 6 is guided in this motion by the oblong holes 20, 21 thereof on the pilots 10, 11 and is shifted from the position in which the through pin 19 mates with the first leg of the U-shaped cutout 22 of the slider. The bolt 5 can, consequently, move in transverse direction of the device, i.e., in direction perpendicular to the sliding bar 15 and the head-on bar 17. The bit of the cylinder must overcome the strength of the return spring 9 pressing onto the top edge 6' of said slider.
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By further rotation of the key the bit of the lock cylinder comes into mesh with the groove 30 of the coupling link 7, which is hereby shifted into transverse direction of the device. Such direction of movement is ensured by two oval-shaped pivots 28, 29 guided in the cutout 31 of the cover 1' of the housing. Since the coupling link 7 is pinjointed with the through bore 25 of the swing arm 8, the latter moves simultaneously with the coupling link 7. Therefore, the translatory shift of the coupling link 7 is with coincident movement of the swing arm 8 transmitted to the bolt 5, however, the translatory movement of the bolt 5 is essentially greater than that of the coupling link 7. This difference is due to the leverage ratio of the system consisting of the center of rotation of the swing arm 8 about the pivot 26 of said coupling link and the point of application of the pivot 18 of said bolt into the oblong hole 24 of said swing arm.
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When the bit of the lock cylinder is placed by means of rotation of the key into the position in which it no longer meshes with the groove 30 of said coupling link, a translatory movement of the coupling link 7, the swing arm 8 and the bolt 5 stops and the position closed is achieved. Rotating the key further, the thrust of the bit to the slider 7 is gradually decreased so that in the end position said slider is forced by the return spring 9 back into the starting position. Here the through pin 19 meshes with the second leg of the U-shaped cutout 22 of the slider blocking therewith any movement of the bolt 5.
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The bolt 5 is carried over into the position open by rotating the key in the opposite direction.
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At a device described in the foregoing, the bit of the lock cylinder drives the coupling link 7 directly, not driving the bolt 5 as is common according to the state of the art. The movement of the bit is transferred to the bolt 5 by means of a linkage with such a leverage ratio that an essentially higher stroke of the bolt 5 is rendered possible than the stroke of the coupling link 7 driven by the bit of the lock cylinder. In such manner a relatively great stroke of the bolt is achieved applying only a single rotation of the key.
