Closure fasteners – Keepers – With movable dog – catch or striker
Patent
1991-09-20
1993-03-23
Moore, Richard E.
Closure fasteners
Keepers
With movable dog, catch or striker
E05B 4700
Patent
active
051957922
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a locking device for doors and the like comprising a housing and ratchet means cooperating therewith to optionally retain the securing plate in locked position, the plate being pivotable about a spindle and arranged to be moved between open and closed position by the bolt and to remain in one or other of these positions. With previously known electrically operated securing plates the door lock must consist of a spring-loaded, descending bolt with angle-cut end face, which is not considered as reliable as a sliding bolt.
Assurance is also desired that the lock has assumed its final position and that the bolt has reached its innermost or outermost position, respectively, as there may otherwise be some uncertainty as to this. Sensing the status of the lock is thus desirable.
These and other similar problems are solved by the present invention which is characterised in that the device also includes an indicator in the form of a cam with a pin, designed to cooperate with the securing plate in sensing the position of the bolt and conveying this information to a limit breaker or the like when the securing plate is in closed position.
The securing plate is pivotable about a spindle, the closing and opening movements of the plate occurring during rotation about the spindle and the centre of rotation being so located that the securing plate is moved aside by pressure from the bolt, for instance, when the door is opening or closing.
According to a preferred embodiment of the invention the securing plate and a pivotable cam are journalled on the same spindle, a pin on the cam cooperating with the securing plate and transmitting information to a microswitch or the like as to whether the bolt inside the locking device is locked in the securing plate. This cam is also forcibly guided by the securing plate, the cam being pushed to its innermost position by the pressure of the securing plate against the cam pin when the door is opened.
This enables the bolt to enter the securing plate upon closing, without touching the cam.
According to another embodiment of the invention, the securing plate is also arranged so that the ratchet is unable to lock the plate when the plate is in open position, i.e. when the door is open.
The ratchet can only lock the securing plate when the door is closed, i.e. when the bolt has forced the securing plate to closed position and the ratchet falls by its own weight to its lowermost position in the recess in the securing plate.
To prevent unauthorized lifting or picking of the ratchet itself, said ratchet is provided with a link having an inclined groove for engagement with the lifting pin of the ratchet, said pin being designed so that if the upper, jointed part of the link is lifted by an electromagnet, for instance, the protruding portion of the link below the stop will be exposed first, thus permitting continued movement upwards (unlocking) of the ratchet. Furthermore, the inclined groove is arranged to effectively force the protruding part of the link to an end position against a stop if any unauthorized attempt is made to open the lock by lifting the ratchet itself, e.g. in the event of sabotage.
The invention will be described in the following with reference to the accompanying drawings in which
FIG. 1 shows a frontal view of a lock,
FIG. 2 shows a side view in the direction II--II,
FIG. 3 shows a cross section along the lines III--III in FIG. 2 (door closed, bolt inoperative),
FIG. 4 shows a cross section along the lines IV--IV in FIG. 1 (door closed, bolt inoperative),
FIG. 5 shows a cross section along the lines V--V in FIG. 3 (closed door, bolt inoperative),
FIG. 6 shows a cross section along the lines VI--VI in FIG. 3 (closed door, bolt inoperative),
FIG. 7 shows a cross section along the lines VII--VII in FIG. 11 (closed door, bolt in operation),
FIG. 8 shows a cross section along the lines VII--VII in FIG. 11 open door, bolt in operation),
FIG. 9 shows a cross section along the lines IX--IX in FIG. 11 closed door, bolt in operation),
FIG. 10 shows a
REFERENCES:
patent: 3325203 (1967-06-01), Moler
patent: 3521921 (1970-07-01), Miyazaki
patent: 3796452 (1974-03-01), Foster et al.
patent: 3861727 (1975-01-01), Froerup et al.
patent: 4026589 (1977-05-01), Hanchett
patent: 4302039 (1981-11-01), Dukel et al.
patent: 4406487 (1983-09-01), Stendal
patent: 4756566 (1988-07-01), Logas
patent: 4986584 (1991-01-01), Logas
Moore Richard E.
Stendals Elektriska AB
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