MULTI-POINT LOCK

Abstract: A multi-point lock comprises a draw bar (7) which can be moved between a locking position (Fig. 5) and an unlocking position (Fig. 3), by rotation of a draw bar drive (3). This drive is moved when a driver (2) is shifted in one or the other direction by turning a rotary part (1) by means of a handle, the rotary part engaging a recess in the driver through a guide pin. The recess of the driver (2) for the guide pin is designed in such a way that the driver is shifted when from a neutral starting position the rotary part (1) is turned through a predetermined angle (45<o>) and is returned when from the neutral starting position the rotary part (1) is turned through another predetermined smaller angle (26<o>) in the opposite direction.

Description: MULTI-POINT LOCK The present invention relates to a multi-point lock of the type described in the introduction to the claim. Such multi-point locks are known to have the unlocking and locking movements controlled by equally large, but oppo- sitely acting handle motions from a neutral position which is, normally, horizontal. The most natural handle position at the moment of unlocking is known to be 26°. In prior art locks the result is that the handle position at the moment of.locking is also 26°, but, of course, in the direction opposite to the neutral position. The result is handle operating problems because the forces to be used to make locking rollers engage with the relevant striker plate are hard to overcome by rotating the handle through 26° only. The objective of the invention is to show a lock of the said type where the optimum angle at the moment of unlocking (26°) is obtained without the handle rotation for overcoming the locking forces becoming too small. This is obtained according to the invention by the design specified in the claim. In the following the invention is explained further in con¬ nection with the drawing where Fig. 1 shows an "X-ray picture" of a multi-point lock. according to the invention, as seen from one side, Fig. 2 the lock viewed from one side in neutral condition after locking; in addition to which four movable main components are also shown in the correct angular positions outside the lock casing. Fig. 3 the same view, but after unlocking, Fig. 4 the same view, in the neutral condition after unlocking. Fig. 5 the same view, after locking. Fig. 6 the four movable main components of the lock, viewed in perspective and mutually separated, and Fig. 7 illustrates the connection between locking movement and rotation of the lock handle. The multi-point lock shown on the drawing comprises a lock casing 11, not specified further, which is designed for insertion in a door leaf. The lock casing contains a main guide - " rotary part 1 - which can turn on an axis at right angles to the plane of the drawing, the axle of which part can also turn in a recess in a main driver 2 and in a latch • lever 4. The rotary part 1 has two pins, one of which interacts with the said recess of the main driver 2, while the other interacts with the latch lever 4. The lock casing also contains a draw bar drive 3 which can turn on another axis at right angles to the plane of the drawing, which draw bar drive turns on the said axis by shifting of the main driver 2 which has a hole engaged by a pin projecting from the draw bar drive 3. The draw bar drive 3 has a serration engaging a draw bar 7 so that the latter part reciprocates when the draw bar drive 3 is turned. The latch lever 4 is connected to a latch bolt 5 projecting from the lock casing 11 which, when the latch lever 4 is turned, can be drawn into the lock casing counteracting the force of a spring 6. At one end or both ends of the axle of the main guide/rotary part 1 a handle (not shown) is located which operates the lock. The main guide/rotary part 1 is affected by a main spring 10 which tries to hold the rotary part in the neutral condition shown in Figs. 2 and 4. in Fig. 2 the rotary part 1 is in the neutral condition after locking of the lock. The lock is unlocked by turning the rotary part 1 through 26° as shown in Fig. 3. This turn will make the guide pin of the rotary part force the main driver 2 upwards. The pin of the draw bar drive 4 engaging the driver will then cause the draw bar drive to turn clockwise so that the draw bar is moved upwards. The lock is then unlocked. The other pin of the rotary part 1 will at the same time fetch up against the latch lever 4 and turn it clockwise. The latch bolt 5 is then drawn into the lock casing opposing the effect of the spring 6. When the handle is released, the main spring 10 will move the rotary part 1 to the neutral condition as shown in Fig. 4, and the spring 6 will press the latch bolt 5 outwards. The latch bolt 5 can be drawn in again by the rotary part 1 being turned through 26° again (Fig. 3). The guide pin on the rotary part will thus only be shifted ineffectively in the recess 2 of the driver. Locking is carried out by the rotary part 1 being turned through 45° in the opposite direction. During this turn the guide pin will move the main driver 2 downwards. This down¬ ward movement is transmitted to the draw bar 7 via the draw bar drive 3. When the handle is released, the rotary part 1 will be moved to the neutral condition shown in Fig. 2 by the main spring 10. Fig. 7 is a graphic representation of the relation between the movement of draw bar 7 and the turn of the rotary part - 1 during locking. The attraction itself will take place when the draw bar has moved through 64% of the total movement. With a normal prior art lock it corresponds to a 28° rotation of the rotary part 1 as shown on curve I. With the prior art lock completion of the locking movement requires an extra turn through 45° - 28° = 17°. Because of the increased ratio during the locking phase of the lock shown (curve II) a draw bar movement of 64% is obtained already after the rotary part 1 has turned through 21°. To complete the locking movement the rotary part 1 of the lock in question, therefore, has to be turned through another 45° - 21° = 24°. The result is an easier movement of the handle and a higher attraction.

Claims: C A I M A multi-point lock comprising a draw bar (7) which can be moved between a locking position (Fig. 5) and an unlocking position (Fig. 3) by rotation of a draw bar drive (3) which is moved when a main driver (2) is shifted in one or the other direction by rotation in one or the other direction of a rotary part (1) provided with a handle, the rotary part (1) having a guide pin engaging a recess in the driver (2), characterized in that the recess of the driver (2) for the guide pin of the rotary part (1) is designed so that the driver (2) is moved from one extreme position to the • other when from a neutral starting " position the rotary part (1) is turned through a predetermined angle (45°) and from its opposite extreme position when from the neutral starting position the rotary part (1) is turned in the opposite direction through another predetermined angle (26°) which is considerably smaller than the first- mentioned predetermined angle.

Inventors: BORUP-NIELSEN LARS, BORUP-NIELSEN, LARS
Applicants: MILA BESLAG AS
Application year: 1986
Main classification: E05B63
IPC codes: E05C9