Locks – Special application – For closures
Reexamination Certificate
2001-08-31
2003-05-27
Knight, Anthony (Department: 3676)
Locks
Special application
For closures
C070S37900R, C070S380000, C292S067000, C292S114000
Reexamination Certificate
active
06568226
ABSTRACT:
BACKGROUND OF THE INVENTION
a) Field of the Invention
The invention is directed to a rotating-lock closure provided with a traction unit, which comprises a closure housing that has a socket key opening on one outside end and a rotating lock on the other, inside end; which can be inserted with one end through a passageway matching the outside cross-section of the housing and which is in a wall, for example, a door leaf; and which can be fixed in position; with a first bearing area which is open to the outside end and coaxial with the housing axis and which is intended for the socket key receiving head, as well as a second bearing area open toward the opposite end of the housing that connects with the first bearing area and which is intended for the rotating-lock driving support that supports said rotating lock and is mounted so as to be capable of axial and sliding displacement and of rotation in the second bearing area, wherein a coupling device is to be provided between the key receiving head and the rotating-lock, and wherein the closure is to be provided with a cam pin/cam track device for the rotation and/or axial displacement of the rotating-lock relative to the key receiving head and a limited angular play/freewheeling exists between the key receiving head and the rotating-lock.
b) Description of the Related Art
Such a rotating-lock closure is already known, cf. DE 35 04 691 C2.
Furthermore, the closure arrangement according to DE 35 02 418 C2, which is of a similar design, should also be referred to.
U.S. Pat No. 2,269,264 is also of interest.
All three known closures work like this: when the lock or sash lock is operated for the purpose of closing, it is at first rotated into the door-closing position. This normally means a rotation of 90 degrees. If the operating handle is rotated further after this, a traction movement takes place by means of which the lock is pulled towards a surface behind which it engages (rear engaging surface) so that a force of pressure is attained between, for example, the door and the door frame. This combined rotating and axial movement is attained by means of a cam pin/cam track device; in the case of DE 35 02 418 C2, this is arranged in the handle levering area, while for DE 35 04 691 this has been moved into the inside of the lock housing and is in the shape of a sleeve arranged between the lock housing on the one side and the shaft holding the lock on the other side; in it, slits are arranged that run axially and diagonally in which the ends of a cam pin, realized as a transverse pin inserted in the shaft bearing the lock, slide. U.S. Pat. No. 2,269,264 does not have this housing. Instead, an operating shaft
21
with an operating head
22
is held so that it can rotate inside a holding plate
15
which is riveted to a flap
13
that can be hung on the frame
10
. The holding plate
15
forms back stops
18
and guides
16
for a lock (sash lock)
23
which is supported by a sleeve
24
provided with cam tracks
28
. The end of the operating shaft
21
facing away from the operating head
22
support cam pins
28
sliding in cam tracks
28
while under pressure from a spiral spring
29
arranged between the holding plate
15
and the lock
23
.
The disadvantages of prior art lie in the complicated construction which results in increased production costs and laborious assembly. For example, the closure according to DE 35 04 691 C2, cf. its
FIG. 2
, comprises a closure housing with a flange, which can be mounted in a wall with two screws (or alternatively with a union nut); a key receiving head held in the housing by a retainer ring; a rotating-lock driving support mounted in this so as to be capable of axial and sliding displacement which supports the rotating-lock, the lock being fixed to this support by means of two nuts; a pin which goes transversely through the support and the ends of which are guided in the cam tracks of a sleeve that needs to be produced separately in a complicated punching process and which in turn is arranged inside the housing and coupled to the receiving head in a manner that permits rotation. Finally, there is a pressure spring which pushes the shaft towards the outside, that is towards the open position.
This means that the arrangement known from DE 35 04 691 CS consists of ten parts, some of which have to be produced in a complicated manner.
The closure known from U.S. Pat. No. 2,269,264 needs a lot of space, is not protected against dirt, since it has no housing, and mounting the holding plate on the flap requires laborious riveting.
OBJECT AND SUMMARY OF THE INVENTION
It is the primary object of the invention to create a rotating-lock closure of the type mentioned in the beginning which is made of significantly less parts that are simpler to produce and which therefore is cheaper to produce and easier to assemble.
This object is met by the fact that a shaft having a rounded cross section and extending from the key receiving head protrudes beyond to the rotating-lock driving support and has a transverse opening at its protruding end for receiving a cam pin. A cam track, on which the pin is guided against the force of a spring, is formed by the side of the lock facing away from the housing. The outer periphery of the lock driving support has a non-rounded cross section and is capable, in a passageway also having a non-rounded cross section, of axial and sliding displacement in a first portion of the second bearing area and of limited rotation in a second portion of the second bearing area. Such an arrangement has significantly less parts, for example only six parts. This makes it cheaper to produce and easier to assemble. The cam track is on the outside and can be injection-molded in simple injection molds. The coupling device is protected inside the housing and is of a particularly simple construction because the bearing area portions are smaller than, for example, the arrangement in U.S. Pat. No. 2,269,264. The rotation capability is preferably to be restricted to about 90 degrees.
It is advantageous if the non-rounded cross section of the lock driving support is a parallelogram with rounded corners.
The non-rounded cross section of the passageway in the second portion of the second bearing area could consist of two opposing segments of a circle connected with each other by two parallel side walls or by lug areas projecting into the lumen of the passageway.
With regards to the housing, it is advantageous if the housing is divided into the first and second bearing area by a dividing or partition wall, this dividing wall having a circular passageway for the passage of the shaft which starting at the key receiving head penetrates the lock driving support. In this manner, the use of a retainer ring is avoided.
According to another, different development, the key receiving head supports itself by a rear ring shoulder on the dividing wall and in the first bearing area.
In the second bearing area, a spiral pressure spring supports itself on the dividing wall on one side and on the face of the of the lock driving support on the other side.
It is particularly advantageous if the rotating-lock forms a reinforcing wall which encloses the cam track in a circle and which stops the cam pin from sliding out. By means of this, fixing the cam pin by means of an interference fit is no longer necessary, which makes disassembly as well as assembly significantly easier.
The rotating lock could form a constriction which is directed towards the housing and which permits the insertion of the tongue of the rotating lock and also of the assembled housing, meaning the completely assembled closure, through an opening in a thin wall (and, if necessary, the pushing-on of a union nut). This is also a feature which makes mounting a lot easier, since rotating-lock closures can be mounted in a thin wall ready-assembled.
Such a rotating-lock is particularly advantageous when the rotating-lock closure consists of a closure housing which has a flange on the one, outside end and which can be passed through a passageway matching the outside cr
Knight Anthony
Kyle Michael J.
Reed Smith LLP
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