GB2159571A

GB2159571A - Door lock

Info

Publication number: GB2159571A
Application number: GB08513477A
Authority: GB
Inventors: Naveda Mariano Gomez-Olea
Original assignee: Individual
Current assignee: Individual
Priority date: 1984-05-29
Filing date: 1985-05-29
Publication date: 1985-12-04
Also published as: ES279548Y; ES279548U; GB8513477D0; DE3519229A1; FR2565284A1

Abstract

A door lock comprises a lever 2 pivoted at 3 for movement against a bias spring 8. A rod 9 is pivoted to the lever 2 and carries a roller 10 which runs in a slot 14 of a fixed cam 11 and into a slot of a pivoted cam 12 so as to prevent the cam 12 from pivoting. A key-operated mechanism 5 or solenoid 7 urges the lever 2 against the bias of the spring 8 so as to move the rod 9 such that the roller 10 is moved out of the slot 15. The cam 12 can now pivot and release a tooth 18, so as to permit a door to which the lock is fitted to be opened, while the roller 10 runs on a surface (17) of the cam 12. <IMAGE>

Description

SPECIFICATION Improvements in or relating to closure devices The present invention refers to a fixed toothed closure device which is housed in a lock casing preferably located in the door frame, on which a tooth provided in the door leaf acts.

The device of this invention is comprised of a lever oscillating about a shaft fixed between two opposed walls of a lock casing which is capable of adopting various angular positions when driven by the rod of a key-operated mechanism or of an electromagnet incorporated in the casing, said lever recovering its original position by means of an antagonical spring. The said lever is hinged on the end of a small connecting-rod which at its free end has a transversal roller which, in the displacement of the small connecting-rod, is guided at its ends in grooves made in two cams, one of which is fixed to the casing whereas the other can turn about an axis perpendicular to its plane and likewise fixed to the lock casing.

The groove of the fixed cam is made in a longitudinal direction to the displacement of the roller, whilst the groove of the movable cam adopts a profile to support the said roller constituted by a straight section, parallel to that of the fixed cam, prolonging into another curvilinear section concentric with that of its axis of rotation. With this arrangement, the movable cam can only turn when the guide roller is supported on the curvilinear profiled section, whereas if the said roller is encountered on the radial section of its groove, it is blocked without any possibility of turning.

The movable cam also has a notch at a point of its periphery, the sides of which contact the fixed tooth located in the door leaf, with the operation thereof, the said tooth being fastened therein. The lock casing comprises a window facing the movable cam to facilitate access of the tooth in the notch, both for opening and closing the door.

When the key-operated mechanism of the lock is not activated, or the electromagnet is not energized, the spring acting on the oscillating lever places it in a position at which the roller included in the grooves of the cams, is in the blocked position of the movable cam, whereas when the key-operated mechanism or electromagnet is activated, the roller is supported on the curvilinear profile of the movable cam, wherefore the tooth can be displaced leaving the notch, the movable cam consequently turning to permit it.

Upon closing the door, the tooth can pass into the notch of the movable cam since it is in the position which permitted the tooth to be released, until it butts against the rear side of the notch causing the movable cam to turn until the roller is blocked, the door being blocked as long as the key-operated mechanism or the electromagnet is not activated.

The oscillating lever can also be fixed at an angular position which maintains the roller supported on an inclined recess made in the joining of the straight sections and arched profile of the groove of the movable cam, thereby permitting the door to be locked but not blocked.

The oscillating lever can also be hinged to another lever bearing at its free end a pin guided in the lock casing and capable of occupying an emerging or retracting position with respect thereto, being housed in a hole made in the door leaf, wherefore there is a second blocking.

For a better understanding of this specification a set of drawings is accompanied. forming an integral part thereof, wherein illustratively but not limiting the following is represented: Figure 1 is a perspective view of the lock casing incorporated in the closure device of the invention.

Figure 2 is a perspective view of the tooth fixed to the door leaf, complementary of the closure device of the invention.

Figure 3 is a longitudinal section of the lock casing including all the elements of the device.

Figures 4 and 5 are views of the movable cam, in the blocked and unblocked position, respectively, of the fixed tooth.

Figure 6 is a view similar to that of figure 4 illustrating that blocking of the movable cam can be obtained even though a clearance exists between the frame and the door, that is, the tooth fixed to the leaf acts at the radially furthest point of the notch of the movable cam.

Figures 7 and 8 are respective views similar to those of figures 1 and 2, with the lock casing positioned in the door leaf and the fixed tooth in the door frame.

Referring to the drawings, it can be seen that the fixed closure device of the invention incorporates a lock casing 1, preferably fixed to the door frame, a lever 2 oscillating about a fixed shaft 3 on which the rod 4 of the keyoperated mechanism 5 or the rod 6 of the electromagnets 7 acts, overcoming the resistance of a spring 8. The oscillating lever 2 is hinged to a small connecting-rod 9 bearing at its free end a roller 10 whose ends slide, guided in grooves made in two cams 11 and 12, cam 11 being fixed to the casing 1 whereas cam 1 2 oscillates about a fixed axis 13, perpendicular thereto and parallel to the roller 10.

The grooves of both cams 11 and 1 2 can clearly be seen in figures 4 and 5. The fixed cam 11 is provided with a groove 1 4 in a radial direction to the movable cam 12, whereas the groove of the movable cam 1 2 is determined by a radial groove 15, one of whose sides 1 6 prolongs into an arched profile 17, concentric with the axis of rotation 1 3 and on which the roller 10 of the small connecting-rod 9 is supported.

At the position of figure 4, the turn of the movable cam 1 2 about the axis 1 3 is blocked, since the roller 10 is located at the bottom of the grooves 14 and 1 5 of both cams. In figure 5, the movable cam 1 2 is allowed to turn, since the roller 10 is supported on the curvilinear profile 1 7 of the movable cam, which position is promoted because the keyoperated mechanism 5 or the electromagnet 7 has been activated, so that the oscillating lever 2 can be displaced to the position indicated with dotted lines in figure 3.

The turn of the movable cam 1 2 is achieved by means of a tooth 1 8 fixed to the door leaf 19, which is capable of contacting the movable cam 1 2 through a groove 20 made in the casing 1 and in a faced position, as can be seen in figure 1. The contact between the fixed tooth 1 8 and the movable cam 1 2 is established since said cam 1 2 is provided with a notch 21 made at a point of its periphery, preferably at the zone opposite to that of the groove 15, this notch having corresponding sides, anterior 22 and rear 23, on which the tooth 1 8 presses when the door is opened and closed respectively.

In the arrangement illustrated in figure 4, the fixed tooth 18 cannot cause the cam 12 to turn and, therefore, the door is blocked in the closed position. Upon operation of the opening means 5 or 7, the roller is displaced to the position shown in figure 5, wherefore the fixed tooth 1 8 can be displaced towards the left of this figure, pressing against the side 22 of the notch 21, thereby permitting the door to be opened and the movable cam 21 adopts the position indicated in figure 5.

When closing the door, the fixed tooth 18 is capable of contacting the rear side 23 of the notch 21, causing the movable cam 12 to turn in a clockwise direction, whilst the roller 10 presses against the arched profile 1 7 and reaches the radial groove 16, occuping the bottom of this groove due to the action of the spring 8, thereafter preventing the displacement of the fixed tooth 1 8.

According to figure 6 and in order to effect blocking of the door, even though a nondesired clearance exists between the frame and the door, that is the tooth 1 8 contacts the rear side 23 of the notch 21 at a radial point furthest from the axis of rotation 13, wherefore the fixed tooth 1 8 would not cause the cam 1 2 to turn sufficiently so that the roller 10 can enter the radial groove 1 6 and effect blocking, the invention proportions an inclined recess 24 as a joining of the straight section 1 6 and curvilinear profile 1 7 for supporting the roller 10 on the movable cam 12.In this manner, even though the complete turn of the movable cam 1 2 is not produced, the roller 10 previously reaches the inclined plane 24 and by the action of the spring 8 is inserted in the bottom of the groove 15, blocking the fixed tooth 1 8.

Furthermore, according to the invention, the oscillating lever 2 can be fixed at an angular position which maintains the roller 10 supported on the inclined recess 24, thereby obtaining a locking but not a blocking of the door. This position of the lever 2 is achieved by an eccentric butt 25 (figure 3), which is activated by means of a control element 26 on the outside of the lock casing 1, as can be seen in figure 1.

To further guarantee the security of the closure device, the invention proportions a pin 27 activated by the oscillating lever 2 itself and capable of being housed in a hole 28 made in the door leaf 1 9. This pin 27 is guided in the lock casing 1 and secured by means of a pin 29 to the end of a lever 30 hinged, in turn, at its free end to the oscillating lever 2 by means of the corresponding pin 31.

In the event such security pin 27 is provided, it can constitute the only blocking element of the door, the profiles of the movable cam being designed to determine the faced position of the closure device, thereby permitting the diameters and thicknesses of the other elements, such as shafts, articulations, cams and teeth, to be reduced.

Figures 7 and 8 illustrate the device of the invention with the lock casing 1 mounted in the door leaf 1 9 and the fixed tooth 1 8 coupled in the frame 32, inversely to that represented in figures 1 and 2, the same anchoring effect being achieved.

The groove 1 5 of the movable cam 1 2 determined by the radial groove 16, the inclined recess 24 and the curvilinear profile 1 7 concentric with the axis of rotation 13, on which the roller 10 is supported, could likewise have been disposed occupying an inner zone of the cam surface, by means of a closed radial groove which will be prolonged in a curvilinear groove concentric with the same axis of rotation 1 3, made at its end closest to the axis of rotation. In this case, the oscillating lever 2 will be hinged at a central point and the spring 8 will pull the lever 2 to house the roller 10 in the furthermost end of the groove, this position corresponding to that of blocking of the cam.

Claims

1. Fixed toothed closure device, characterised by a lever oscillating at an inner point and about a shaft fixed to the lock casing, one of the sides of which is activated by the rod of a key-operated mechanism or of an electromagnet which causes its other end to be pushed against a small connecting-rod hinged therein, this latter bearing an end transversal roller capable of being displaced when its ends are housed in grooves made in two cams, one of which is fixed to the casing whilst the other oscillates about a fixed axis perpendicular thereto, the groove of the fixed cam being radial to the movable cam and the groove of this latter is parallel thereto, prolonging at one of its ends perpendicularly into another arched profile concentric with the axis; a spring which maintains the small connecting-rod with the roller at a radial point furthest from the arched profile, the turn of the movable cam being blocked as long as the key-operated mechanism is not activated to position the roller in correspondence with the arched profile of the movable cam; the movable cam is provided with a notch at a point of its periphery in which can be housed the fixed tooth provided in the door leaf which accedes thereto through a faced opening made in the lock casing when the movable cam is in a turning position. at which the roller is placed on the curvilinear profile and the anterior side of the notch is tangential to the linear path of the far end of the fixed tooth when closing the door, butting of the fixed tooth against the rear side of the notch of the movable cam is produced at the progressive closure position by turning this until the roller reaches the straight groove and due to the action of the spring it is separated, blocking the turn of the cam and, therefore, the door.

2. Fixed toothed closure device according to claim 1 wherein the groove of the movable cam has an inclined recess in the joining of the straight and curved sections of the roller support surface.

3. Fixed toothed closure device according to claims 1 and 2, wherein the oscillating lever can be fixed at an angular position which maintains the roller supported on the inclined recess of the groove of the movable cam, thereby allowing the door to be locked but not blocked, by a control element on the outside of the lock casing which activates the eccentric butt.

4. Fixed toothed closure device according to claims 1 and 2, wherein the oscillating lever is hinged at its free end to that of another lever joined, in turn, in an oscillating manner and its other end to a pin guided in the lock casing and capable of occupying an emerging or retracting position, to be housed or not in a blocking hole made in the door leaf.

5. Fixed toothed closure device according to the preceding claims, wherein the groove of the movable cam does not support the roller, thereby causing the free turn of the cam with the opening or closing of the door, since the fixed tooth rests on its sides, the turn of the cam being utilized to pull the roller which involves the blocking or releasing of the pin.

6. Fixed toothed closure device according to the preceding claims, wherein the fixed tooth is located in the door frame and the lock casing is located in the door leaf.

7. A closure device comprising a lever which is pivotable between first and second positions and which is biased toward the first position, release means for pivoting the lever to its second position, a rod pivoted to the lever and constrained for substantially longitudinal movement, a projection at a free end of the rod, and a pivotable cam having a first recess for receiving the projection when the lever is in the second position and a second recess for receiving a tooth of a cooperating closure member.

8. A closure device substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.