U.S. patent number 3,899,907 [Application Number 05/370,934] was granted by the patent office on 1975-08-19 for cylinder lock assembly.
Invention is credited to Herman Prahl.
United States Patent |
3,899,907 |
Prahl |
August 19, 1975 |
Cylinder lock assembly
Abstract
A cylinder lock assembly is provided having a cylinder lock
including an externally threaded housing, an internally threaded
adjustable extension for mating with said housing and adjusting the
combined length of said housing and extension to the width of the
door in which said assembly is to be installed. The assembly is
further provided with a door plate and end plate for mounting the
assembly to the door.
Inventors: |
Prahl; Herman (Woodside,
NY) |
Family
ID: |
23461794 |
Appl.
No.: |
05/370,934 |
Filed: |
June 18, 1973 |
Current U.S.
Class: |
70/370; 70/452;
70/451 |
Current CPC
Class: |
E05B
9/084 (20130101); Y10T 70/7655 (20150401); Y10T
70/8568 (20150401); Y10T 70/8541 (20150401) |
Current International
Class: |
E05B
9/00 (20060101); E05B 9/08 (20060101); E05B
009/08 () |
Field of
Search: |
;70/370,451,373,374,372,452 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
366,680 |
|
Jan 1923 |
|
DD |
|
1,376,584 |
|
Sep 1964 |
|
FR |
|
Primary Examiner: Wolfe; Robert L.
Attorney, Agent or Firm: Zeller; Harvey
Claims
What is claimed is:
1. A cylinder lock assembly, comprising:
a cylinder lock having an externally threaded housing having front
and rear surfaces and having a key plug extending through said
housing, said key plug having a key slot therein and a key hole
exposed at the front surface of said housing;
adjustable extension means having an internally threaded aperture
therein for threadedly mating with said externally threaded housing
for adjusting the combined length of said cylinder lock and
extension means to approximately the width of a door in which said
cylinder lock assembly is to be installed;
a plurality of threaded bores in said rear surface of said
housing;
a plurality of screws of a length greater than the difference
between the length of said housing and said combined length for
securing said assembly to a door; and
end plate means having a plurality of apertures therein in
alignment with said threaded bores in said rear surface of said
housing for receiving said screws and securing said assembly to a
door.
2. A cylinder lock assembly as defined in claim 1 further including
a door plate covering said front surface of said housing and having
an aperture therein in alignment with said keyhold permitting
insertion of a key in said keyhold and rotation of said key; means
projecting from said door plate in the direction of said cylinder
lock having internally threaded bores therein; apertures in said
end plate means alignment with said internally threaded bores in
said door plate; and screws passing through said apertures and
threadedly mating with said projecting means to secure said end
plate means and said door plate to the door.
3. A cylinder lock assembly as defined in claim 2 further including
a plurality of recesses in said face of said cylinder lock and
protrusions on said door plate in alignment with said recesses for
mating therewith to prevent rotation of said cylinder lock with
respect to said door plate.
4. A cylinder lock assembly as defined in claim 1 wherein said
adjustable extension means is an internally threaded cylindrical
sleeve.
Description
BACKGROUND OF THE INVENTION
The present invention relates to cylinder lock assemblies and more
particularly to cylinder lock assemblies of a universal nature
whereby such assemblies may be used in doors of varying widths.
Cylinder locks are generally utilized in metal doors having front
and rear sheets of metal and a space therebetween. The cylinder
locks have a cylindrical housing which extends part of the way
between the front and rear sheets of metal and are secured within
the door by screws which extend from the rear sheet to the threaded
bores in the rear surface of the cylindrical housing in order to
prevent rotation of the housing relative to the door. In securing
the cylinder lock in this manner, the metal sheets are deformed to
provide the necessary counter forces to the screws to hold the
cylinder lock firmly in the door. While securement of the cylinder
lock to the door in this manner provides initial firm securement,
due to fatigue of the metal sheets, the cylinder lock eventually
becomes loose requiring continual retightening.
The present invention avoids the above problem by providing a
cylinder lock assembly which is adjustable during installation to
the width of the door whereby the cylinder housing is secured
within the door without the need to substantially deform the metal
sheets of the door. Thus, the possibility of loosening by eventual
metal fatigue is substantially eliminated and the need for
retightening is substantially eliminated.
The above feature not only eliminates loosening of the cylinder
lock within the door but also enables more effective usage of a
door plate to cover the face or front surface of the cylinder
housing. In particular, the same metal fatigue which causes
loosening of the cylinder lock within the door also causes
loosening of the door plate enabling the insertion of a prying tool
between the door and the door plate. Through the use of the present
invention, such metal fatigue is substantially eliminated and the
door plate remains securely and firmly pressed against the door to
prevent the insertion of a tool between the door and door
plate.
It is thus an object of the present invention to provide a cylinder
lock assembly having extension means for adjusting the combined
length of the cylinder lock housing and extension to approximately
the width of the door.
It is a further object of the present invention to provide means
for securing both a cylinder lock and door plate to a door whereby
these elements remain tightly secured to the door in spite of the
passage of substantial time which would otherwise result in metal
fatigue of the metal door and loosening of the cylinder lock and
door plate.
SUMMARY OF THE INVENTION
The above objects are accomplished by means of the present
invention which briefly includes a cylinder lock having an
externally threaded housing and an internally threaded cylindrical
extension for mating with the housing and adjusting the combined
length of the housing and extension to approximately the width of
the door in which the lock is to be installed. A door plate is
provided together with an end plate for securing the lock, door
plate and end plate as a single unit to the door not moveable
relative to the door.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is an exploded perspective view of the cylinder lock
assembly of the instant invention; and
FIG. 2 is a cross-sectional view of the cylinder lock assembly of
the instant invention as installed omitting the tumbler
arrangement.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will next be described with respect to the
drawings herein. The present invention utilizes a cylinder lock 10
of the rim lock type having a rod 12 extending from the key plug of
the cylinder lock 10. The cylinder lock 10 may include either a
single row of tumbler elements or multiple rows of tumbler elements
for added protection against picking.
Cylinder lock 10 is mounted between the two sheets of metal 14 and
16 of a hollow metal door. Since metal doors may be of varying
thickness, an adjustment member 18 is provided in the form of an
internally threaded cylindrical sleeve which threadedly mates with
the external threads on cylinder lock 10 and may be rotated for
adjustment of the combined length of the cylinder lock and
adjustment sleeve to the thickness of the door.
The cylinder lock 10 and adjustment sleeve 18 are mounted to the
metal sheets 14 and 16 of the door through utilization of a door
plate 20 and an end plate 22. Specifically, adjustment sleeve 18 is
placed upon cylinder lock 10 and rotated such that the combined
lengths of these elements is adjusted whereby rim 24 engages sheet
14 to align the face of the lock in the same plane as sheet 14 when
the combined unit is inserted into the door such that sleeve 18
engages sheet 16. Screws 26 and 28 are inserted through apertures
30 and 32 of end plate 22 and corresponding holes in sheet 16 to
threadedly engage bores 34 and 36, respectively, in the end surface
of the cylinder lock 10. These screws are then tightened to
securely retain the cylinder lock 10 in the door. Since the
combined length of the cylinder lock 10 and adjustment sleeve 18 is
substantially equal to the thickness of the door, sheets 14 and 16
are not deformed to a substantial extend during the tightening.
Thus, metal sheets 14 and 16 do not lose this elasticity after the
lock has been installed for a substantial period of time and the
lock does not become loose in the door.
After the lock has been secured to sheets 14 and 16, door plate 20
is placed over the face of the lock with aperture 38 in alignment
with the key plug 40 of the cylinder lock. Door plate 20 has a pair
of projection lugs 42 and and 44 thereon which enter corresponding
apertures in sheet 14 and a pair of projections 46 and 48 which
mate with corresponding detents in the face of cylinder lock 10 to
prevent rotation of the cylinder lock 10 relative to the door plate
20. Lugs 42 and 44 have threaded bores therein for receipt of
screws 50 and 52, respectively, which pass through apertures 54 and
56, respectively in end plate 22 to secure the door plate 20 to the
door. Since screws 50 and 52 are outside sleeve 18 while screws 26
and 28 are inside sleeve 18, the tightening of screws 50 and 52
serve to further tighten the securement of the lock within the
door. Furthermore, the fact that the combined length of sleeve 18
and lock 10 is substantially equal to the width of the door,
substantially prevents deforming of sleeves 14 and 16 in the event
that an effort is made to pry plate 20 from the door. Bevelled edge
58 of plate 20 additionally prevents prying and grasping by a
tool.
Rod 12 extending from the key plug extends through an aperture in
sheet 16 as well as aperture 60 in end plate 22 to operate a bolt
operating mechanism (not shown).
Additional apertures 62,64,66 and 68 are shown in end plate 22.
These apertures may be needed for alignment purposes of where
additional lugs are provided on door plate 20 or where additional
threaded bores are provided in the end surface of the cylinder lock
10.
It is seen from the above that the present invention enables the
assembly of a cylinder lock in metal doors of varying thickness
such that the locks do not loosen after time and having a door
plate and end plate which cooperate with an adjustment means to
retain the lock secure to the door and prevent prying of the door
plate.
While the present invention has been described with respect to a
preferred embodiment thereof numerous modifications will now become
apparent therefrom such as various arrangement of the number and
locations of the fastening means. It is therefore desired that the
scopes of the present invention not be determined by the foregoing
illustration but rather by the appended claims.
* * * * *