Locks – Parts – attachments – accessories and adjuncts – For key-operated mechanism
Patent
1985-07-01
1986-06-17
Wolfe, Robert L.
Locks
Parts, attachments, accessories and adjuncts
For key-operated mechanism
70423, E05B 1718
Patent
active
045948666
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is an international phase application corresponding to the Patent Cooperation Treaty international application PCT/EP 82/00240 filed Nov. 6, 1982 and based in turn, on the French national application No. 81/21348 of Nov. 12, 1981 under the International Convention.
FIELD OF THE INVENTION
My present invention relates to a lock cylinder with a pivotable closure.
BACKGROUND OF THE INVENTION
A lock cylinder can have a pivotable closure which is located behind the cylinder cover and which consists of a closing flap which closes the insertion orifice of the key channel, the flap being pivotable about an axis at right angles to the longitudinal axis of the cylinder, one end of a torsion spring resting against the face of the closing flap directed towards the interior of the key channel.
Known lock cylinders of this type are difficult to assemble, especially because a torsion spring is used. A torsion spring of this type has to be tensioned when the closing flap is installed in the cylinder, and the entire unit has to be held in place during the fastening of the cylinder cover, which retains the unit as a whole. The quality of protection achieved by means of a pivotable closing flap necessitates making assembly simpler, thus allowing mass-production at a competitive price.
OBJECT OF THE INVENTION
It is an object of this invention to provide an improved closure assembly for a lock cylinder obviating the aforementioned drawback.
SUMMARY OF THE INVENTION
In a lock cylinder of the type mentioned in the introduction, this object is achieved, according to the invention, when, before assembly, the second end of the torsion spring projects above the outer surface of the lock cylinder and, after being bent round, interacts with a stop connected to the cylinder.
The lock cylinder according to the invention therefore allows the torsion spring, the closing flap and the cylinder cover to be assembled without the spring being tensioned; the spring is tensioned only after assembly and after the cylinder cover has been fastened.
BRIEF DESCRIPTION OF THE DRAWING
The invention is explained in more detail with reference to the drawing, in which:
FIG. 1 shows an exploded persepctive view of a lock cylinder according to an exemplary embodiment of the invention;
FIG. 2 shows a perspective view of the cylinder illustrated in FIG. 1, after assembly, but before the spring is tensioned; and
FIG. 3 shows a view of the cylinder similar to FIG. 2, but with the spring tensioned.
SPECIFIC DESCRIPTION
The lock cylinder 1, especially a cylinder core, has a widened head 2 in which is formed an axial recess 3 which opens into the key channel (not shown). Located in the recess 3 is a closing flap 4 with two lateral lugs 5 which are pivotable in two clearances 6 in the head 2 of the cylinder. One end 8 of a torsion spring 7 rests against the face of the closing flap 4 directed towards the key channel. This helical cylindrical torsion spring 7 lies with its axis parallel to the axis of rotation of the closing flap and, like the latter, at right angles to the longitudinal axis of the cylinder.
A cylinder cover 9 which has an orifice 10 for the insertion of the key and which retains the closing flap 4 and the spring 7 in the recess 3 is mounted on the cylinder head 2 by bending over a fastening plate or tab 11.
When the lock cylinder is assembled, the second end 12 of the spring 7 is introduced into an outward-opening axial slit 13 in the front end of the cylinder head 2; this slit opens at one end into the recess 3 and at the other end onto the periphery of the head 2. The length of the end 12 of the spring 7 is such that this end projects above the periphery of the head 2 approximately radially or parallel to a radial line (FIG. 2). Assembly can therefore be carried out by means of the successive insertion of the spring 7 until it stops, the closing flap 4 and the cylinder cover 9 parallel to the longitudinal axis of the lock cylinder 1.
After the cylinder cover 9 has been fas
REFERENCES:
patent: 2680965 (1954-06-01), Jacobi
patent: 2690071 (1954-09-01), Jacobi
patent: 2747397 (1956-05-01), Jacobi
patent: 3705508 (1972-12-01), Fritsch et al.
patent: 4006616 (1977-02-01), Rubner et al.
Dubno Herbert
Illich Russell W.
Neiman S.A.
Ross Karl F.
Wolfe Robert L.
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