Closure fasteners – Bolts – Sliding
Patent
1996-05-21
1997-09-09
Lindsey, Rodney M.
Closure fasteners
Bolts
Sliding
292DIG15, E05C 104
Patent
active
056648120
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a mechanism for locking a door or door leaf made of glass--in particular prestressed glass--by means of a vertically displaceable latch disposed in a housing mounted to the bottom of the inner surface of the door or door leaf.
Such a mechanism for locking a door is known from the U.S. Pat. No. 1,436,892.
In particular doors and door leaves made of prestressed glass necessitate spaces (air gaps) between their lower edges and the floor. A burglar can insert a tool from outside into such a space in order to lift the latch and, thus, to unlock the door or door leaf.
Prior art designs to avoid this risk require a rotatable operating handle or expensive construction.
It is an object of the invention to provide a mechanism of the type mentioned above which rules out unlocking from outside by a burglar, or renders such unlocking extremely difficult, while being easy to operate and simple in design.
To achieve this object, the mechanism is characterised in that the latch (3) is fixed to a slide block (16) vertically displaceable in the housing (14), the slide block (16) bearing a mounting pin (20) for an operating handle (22) projecting inwardly, the mounting pin (20) being pivotable in a limited range about a horizontal first pivot axle (18) arranged parallel to the door or door leaf, that the slide block (16) further bears an bell crank lever (26) pivotable about a horizontal pivot axle (24) disposed perpendicular to the door (2) or door leaf, a first arm (28) of the bell crank lever (26) extending beyond the mounting pin (20) and being biased downwardly by a spring (30), while the other arm (32) extends downward and is provided with a hook (34) oriented laterally for releasably engaging a latch recess (36) in the housing (14), the bell crank lever (26) being so arranged that, in operation, upon lifting the mounting pin (20) in order to raise the latch (3) from its locking position, the resultant pivoting of the mounting pin causes the bell crank lever to pivot, thereby releasing the hook (34) from the latch recess (36).
In the design according to the invention, the latch can be unlocked by simple linear lifting of the operating handle, and locked accordingly by simple linear lowering of the operating handle. In the locked state, the latch is positively held by the hook engaging the latch recess and cannot be raised from outside, resulting in a safety lock arrangement.
In order to allow the mounting pin of the operating handle to extend horizontally in the locked state, the mechanism is preferably characterised in that the mounting pin extends from a central or lower portion of a vertically elongate base member, the upper part of which is pivotable about the first pivot axle. In order keep the mechanism compact, it is preferably characterised in that the slide block is formed with cavities for receiving the bell crank lever, the spring and/or the base member.
The invention will be explained in conjunction with an exemplary embodiment making reference to the accompanying drawings.
FIG. 1 is a perspective view of the mechanism in the locked state, with its front side open,
FIG. 2 shows the mechanism of FIG. 1 in the unlocked state (or during unlocking),
FIG. 3 is a detailed front view of the mechanism, and
FIG. 4 is a sectional view taken along line IV--IV in FIG. 3.
The mechanism of the exemplary embodiment serves to lock a door 2 (or door leaf) made of prestressed glass to the floor. Adjacent to a lower edge 4 of door 2, cheek plates 10, 12 are attached to the inner surface 6 and outer surface 8 of the door, and coupled to each other by screws 68, 70 penetrating holes 64, 66 formed in door 2. The inner cheek plate 10 confines a housing 14 for a slide block 16. The slide block 16 bears a mounting pin 20 for an operating handle 22 projecting inwardly, the mounting pin 20 being pivotable in a limited range about a horizontal first pivot axle 18 arranged parallel to the door. The slide block 16 further bears a bell crank lever 26 pivotable about a horizontal pivot axle 24 disposed perpendicul
REFERENCES:
patent: 357116 (1887-02-01), Coultaus
patent: 423109 (1890-03-01), Austermuhl Jr.
patent: 776946 (1904-12-01), Ruppman
patent: 1287080 (1918-12-01), Newman
patent: 1436892 (1922-11-01), Morse et al.
patent: 2065615 (1936-12-01), Schlage
patent: 3239261 (1966-03-01), Byson et al.
patent: 4050723 (1977-09-01), Papadatos
Lindsey Rodney M.
Societa Italiana Progetti S.R.L.
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