Locks – Special application – For closures
Patent
1986-05-14
1987-10-06
Wolfe, Robert L.
Locks
Special application
For closures
70417, 292201, 292346, E05B 6508
Patent
active
046974423
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a lock mechanism for vertically sliding overhead doors, gates and similar. There are at present no satisfactory locking means for overhead gates because of the great play involved between the door and the door post sideways as well as backwards and forwards. A lock having a lock latch of conventional type can therefore not advantageously be used.
The invention solves this problem by a design of the locking device such that the stationary part of the lock, including a movable latch is provided with a tubular lock sleeve which is parallel with the direction of movement of the door, the movable part of the lock having a lock plunger or lock bar adapted to enter into the lock sleeve on closing of the gate for locking engagement with the latch.
In connection herewith the play between the lock plunger and the lock sleeve is sufficiently great to cover the lateral play occurring in vertically sliding overhead doors. Furthermore the free end of the lock plunger can be given a tapering shape for guiding the plunger into the sleeve, thus extending the lateral range of the sleeve for cathing up the plunger.
The latch is suitably operated by an electric magnet, and there may also be an electric limit switch mounted on the latch. The switch closes when the latch is in locking position if at the same time the plunger is inserted into the the sleeve, i.e. if the sliding gate is closed. The contact in the limit switch induces a signal which can be used for indicating purposes or for initiating a burglar alarm.
The lock mechanism is furthermore designed such that the door or gate can be closed independently of whether the lock magnet is under tension or not. For releasing the plunger and opening the gate is, however, normally required that the lock magnet is put under tension. The lock may as an alternative be provided with a manual key lock for mechanical releasing of the lock.
An embodiment of the invention is described more closely in the following specification with drawings showing the following.
FIG. 1, a view from above of a lock according to the invention with portions of the door and the wall included.
FIG. 2, a side view in the direction 2--2 in FIG. 1.
FIG. 3, a side view of the lock plunger with fastening seen in the direction 3--3 in FIG. 1.
FIG. 4, a vertical section on a larger scale on the line 4--4 in FIG. 1.
FIG. 5, a side view of the lock housing on the same scale as in FIG. 4 seen in the direction 5--5 in FIG. 6.
FIG. 6, a cross section on the same scale as in FIG. 4 on the line 6--6 in FIG. 4.
The lock according to the invention is shown in survey views in FIGS. 1-3 showing the position of the different parts of the lock in relation to a door or gate and the wall or the door frame in which the door is mounted. As always the lock comprises a stationary part mounted in the frame of the door and a movable part mounted in the door, said parts being adapted for mutual locking engagement. The stationary part of the lock comprises in the present embodiment a lock housing 10 which is carried by the wall 11 by means of a support 12, for instance the frame of the door. The movable part of the lock comprises a lock plunger or lock bar 13, which by means of a bracket 14 is attached to the door 15.
Closer details of the lock housing are shown in FIG. 4. The housing is composed of a cover 16 and a lock sleeve 17. In the cover there is a lock latch 18 pivotally mounted on a lug 19 and having a projection 20 adapted to protrude into the lock sleeve 17 when the latch 18 takes the position shown in FIG. 4. The latch is operated by means of an electrical magnet 21 Which can pivot on a lug 22. The anchor 23 of the magnet is connected to the latch by a joint 24. A spring 25, situated within a protective cover 26 and therefor shown by dashed lines, is adapted to act between the coil 21 of the magnet and a flange 27 on the anchor, so that the anchor is urged downwards in FIG. 4 and holds the latch in the position shown in the drawing. The proper weight of the latch 18 cooperates for this purp
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