U.S. patent number 3,837,196 [Application Number 05/349,102] was granted by the patent office on 1974-09-24 for key changing lock for safe deposit boxes.
This patent grant is currently assigned to Sargent & Greenleaf, Inc.. Invention is credited to Klaus W. Gartner, Eldon C. Higgins, Randall Edward Van Ryne.
United States Patent |
3,837,196 |
Gartner , et al. |
September 24, 1974 |
KEY CHANGING LOCK FOR SAFE DEPOSIT BOXES
Abstract
A changeable combination key lock for safe deposit boxes and the
like, wherein a guard key is insertable into a rotatable guard key
plug to set guard key tumblers to permit retracting movement of a
bolt, and a renter's key is insertable into a rotatable renter's
key plug for engagement with normally coupled segmented tumblers to
aline them to permit retraction of the bolt. A cam member is
provided to be actuated by a change key which is inserted into the
guard key plug when the guard key has been removed and the bolt is
retracted, to disengage gating portions of the segmented tumblers
from the remaining portions of such tumblers, whereupon a new
renter's key may be inserted and the segmented tumblers set for the
key configuration of the new renter's key.
Inventors: |
Gartner; Klaus W. (Rochester,
NY), Van Ryne; Randall Edward (Rochester, NY), Higgins;
Eldon C. (Cedar Rapids, IA) |
Assignee: |
Sargent & Greenleaf, Inc.
(Rochester, NY)
|
Family
ID: |
23370913 |
Appl.
No.: |
05/349,102 |
Filed: |
April 9, 1973 |
Current U.S.
Class: |
70/339; 70/383;
70/355 |
Current CPC
Class: |
E05B
35/125 (20130101); Y10T 70/7548 (20150401); Y10T
70/7734 (20150401); Y10T 70/7458 (20150401) |
Current International
Class: |
E05B
35/00 (20060101); E05B 35/12 (20060101); E05b
035/12 () |
Field of
Search: |
;70/337,338,339,340,341,342,343,355,382,383,384 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Wolfe; Robert L.
Attorney, Agent or Firm: Mason, Fenwich & Lawrence
Claims
What is claimed is:
1. A changeable combination key lock for safe deposit boxes and the
like, comprising a lock case, a locking bolt movable between
projected and retracted bolt positions, a plurality of pivoted
guard key tumblers having gating recesses for accommodating
retraction of said bolt, a plurality of pivoted segmented tumblers
having body segments and gated segments releasibly coupled
therewith at variable positions, said tumblers normally occupying
positions barring retraction of the bolt from projected position, a
first rotatable key plug for insertion of a guard key therein to
aline the guard key tumblers for retraction of the bolt, a second
rotatable key plug for insertion of a renter's key therein engaging
said segmented tumblers and adjusting them to aline their gating
recesses for retraction of the bolt and including means for moving
the bolt between said positions upon rotation thereof, said tumbler
body segments having cam follower surfaces, and a cam rotatably
supported in the lock case adjacent said cam follower surfaces to
be rotated between couple and release positions by a combination
change key inserted in said first key plug, the cam having cam
surfaces engageable with said cam follower surfaces upon rotation
of the cam for decoupling the body segments from their companion
gated segments to free the body segments to assume new positions
corresponding to a new renter's key selectively positioned in said
second key plug.
2. A changeable combination key lock for safe deposit boxes and the
like, comprising a lock case, a locking bolt movable between
projected and retracted bolt positions, a plurality of pivoted
guard key tumblers having gating recesses for accommodating
retraction of said bolt, a plurality of pivoted segmented tumblers
having body segments and gated segments releasibly coupled
therewith at variable positions, said tumblers normally occupying
positions barring retraction of the bolt from projected position, a
first rotatable key plug for insertion of a guard key therein to
aline the guard key tumblers for retraction of the bolt, a second
rotatable key plug for insertion of a renter's kay therein engaging
said segmented tumblers and adjusting them to aline their gating
recesses for retraction of the bolt and including means for moving
the bolt between said positions upon rotation thereof, and a cam to
be rotated between couple and release positions by a combination
change key inserted in said first key plug for decoupling the body
segments from their companion gated segments to free the body
segments to assume new positions corresponding to a new renter's
key selectively positioned in said second key plug, said gated
segments having copuling teeth, said tumbler body segments
including teeth on a first end thereof releasibly intermeshed with
the teeth of said gated segments and including integral extensions
at the opposite end thereof defining cam follower surfaces and said
cam having a cam surface thereon for concurrently engaging said cam
follower surfaces of said body segments upon rotation of the cam
and retracting said body segments from intermeshed relation with
the gated segments by movement in a direction corresponding to bolt
retracting movement.
3. A changeable combination key lock as defined in claim 1, wherein
said guard key tumblers and segmented tumblers are pivotally
mounted on a common tumbler post, said body segments having
elongated slots receiving said post and accommodating decoupling
retracting movement of the body segments codirectional to
retracting movement of the bolt, the body segments having curved
follower surfaces remote from the gated segments forming said cam
follower surfaces partially encircling the axis of rotation of said
cam at diametrically opposite zones about said axis, and said cam
having a surface moveable into contact with said follower surfaces
to a first position for retracting said body segments to a
decoupled position relative to their companion gated segments and
to a second position for returning the body segments to coupled
relation with the gated segments.
4. A changeable combination key lock as defined in claim 1, wherein
said segmented tumblers are arranged in side-by-side stacked
relation collectively defining a tumbler stack, said cam member
having an arm transversely spanning the whole stack of tumblers
eccentric to the axis of rotation of the cam to concurrently engage
portions of said body segments upon rotation of the cam to
decoupling and recoupling positions.
5. A changeable combination key lock as defined in claim 2, wherein
said segmented tumblers are arranged in side-by-side stacked
relation collectively defining a tumbler stack, said cam member
having an arm defining said cam surface transversely spanning the
whole stack of tumblers eccentric to the axis of rotation of the
cam to concurrently engage the cam follow surfaces of said body
segments upon rotation of the cam to decoupling and recoupling
positions.
6. A changeable combination lock key as defined in claim 1, wherein
said segmented tumblers are arranged in side-by-side stacked
relation with said guard key tumblers interleaved in alternation
between each successive pair of segmented tumblers collectively
defining a tumbler stack, said cam member having an arm
transversely spanning the whole stack of tumblers eccentric to the
axis of rotation of the cam to concurrently engage portions of said
body segments upon rotation of the cam to decoupling and recoupling
positions.
7. A changeable combination key lock as defined in claim 2, wherein
said segmented tumblers are arranged in side-by-side stacked
relation with said guard key tumblers interleaved in alternation
between each successive pair of segmented tumblers collectively
defining a tumbler stack, said cam member having an arm defining
said cam surface transversely spanning the whole stack of tumblers
eccentric to the axis of rotation of the cam to concurrently engage
the cam follow surfaces of said body segments upon rotation of the
cam to decoupling and recoupling positions.
8. A changeable combination key lock as defined in claim 1, wherein
said bolt and cam have confronting shoulder portions restraining
said cam against movement from said couple position when said bolt
occupies said projected position and freeing said cam for movement
to its release position only when the bolt is retracted.
9. A changeable combination key lock as defined in claim 2, wherein
said bolt and cam have confronting shoulder portions restraining
said cam against movement from said couple position when said bolt
occupies said projected position and freeing said cam for movement
to its release position only when the bolt is retracted.
10. A changeable combination key lock as defined in claim 1,
wherein said bolt includes an elongated bolt plate portion spanning
the major portion of said lock case and having an opening therein
accommodating said cam, said cam having peripheral interruptions
defining oppositely facing shoulders, and said bolt plate portion
having stop formations substantially abutting said shoulders when
the bolt occupies said projected position to prevent rotation of
the cam from said couple position, said stop formations being
displaced from adjacent the cam when the bolt reaches retracted
position to free the cam for rotation to release position.
11. A changeable combination key lock as defined in claim 2,
wherein said bolt includes an elongated bolt plate portion spanning
the major portion of said lock case and having an opening therein
accommodating said cam, said cam having peripheral interruptions
defining oppositely facing shoulders, and said bolt plate portion
having stop formations substantially abutting said shoulders when
the bolt occupies said projected position to prevent rotation of
the cam from said couple position, said stop formations being
displaced from adjacent the cam when the bolt reaches retracted
position to free the cam for rotation to release position.
Description
BACKGROUND AND OBJECTS OF THE INVENTION
The present invention relates in general to key locks, and more
particularly to key locks for safe deposit boxes and the like,
wherein both a guard key and a renter's key having a proper
configuration on the key bit must be inserted to effect retraction
of the bolt.
It will be appreciated that safe deposit boxes in bank vaults and
similar installations are successively leased to different parties,
to whom the lessor furnishes a renter key adapted to open a given
safe deposit box when the lock is partially operated or armed by a
guard key in the position of the lessor. Often, lessees fail to
return the renter's key at the expiration of their lease, or the
lessee may lose the renter's key, and it becomes necessary in such
cases to change the tumbler lock so that it can be operated by a
renter's key bit having a different configuration. Also, even if
the lessee returns the renter's key at the expiration of his lease,
it is desirable to change the key bit configuration to which the
lock is responsive whenever the lessee of the box is changed, to
prevent the otherwise possible use of an unauthorized duplicate of
the renter's key which may have been made before the renter's key
was returned.
For this reason, certain safe deposit box locks have been made in
such a manner that the position of the gatings in the tumblers
operated by the renter's key is changeable, so that it may be
adjustably set to be opened by different renter's keys. The typical
practice in this regard has been to provide a change key in the
form of a non-round cross-section rod which is insertable into an
opening in the safe deposit lock case or rear cover wall and
through shaped openings in the renter's key tumblers, when the safe
deposit box has been activated by the old renter's key. The
combination change key interfits into shaped openings in one of two
pivoted companion tumbler sectors for each of the renter's key
tumblers, all of which tumbler sectors are pivoted on a fixed
tumbler post, to decouple the normally mated tumbler sectors of
each of these tumbler and permit them to be recoupled in a position
corresponding to the configuration of the bit of a new renter's
key.
An object of the present invention is the provision of a novel
construction of a tumbler lock for safe deposit boxes and the like,
having a first group of tumblers to be set by a guard key, and a
second group of tumblers to be set by the renter's key, and wherein
a change key may be inserted in the key bushing for the guard key
to decouple the gated portions of the renter's key tumblers from
the remaining portions thereof for resetting the renter's key
tumblers to appropriate angular positions by a new renter's key
upon insertion of the latter and operation of the same in a
selected manner.
Another object of the present invention is the provision of a novel
key lock of the tumbler type for safe deposit boxes and the like,
having a plurality of renter's key operated tumblers each having a
gating section and a body section which may be selectively
decoupled upon operation of a special cam by a combination change
key inserted in the lock and operated in a special manner.
Other objects, advantages and capabilities of the present invention
will become apparent from the following detailed description, taken
in conjunction with the accompanying drawings illustrating a
preferred embodiment of the invention.
BRIEF DESCRIPTION OF THE FIGURES
FIG. 1 is a front perspective view of a changeable lock for safe
deposit boxes, embodying the present invention;
FIG. 2 is a horizontal longitudinal section view taken along the
line 2--2 of FIG. 1;
FIG. 3 is a front elevation view of the safe deposit box lock, with
the cover removed;
FIG. 4 is a vertical transverse section view taken along the line
4--4 of FIG. 3;
FIG. 5 is a fragmentary, exploded perspective view of a portion of
the locking bolt and portions of two adjacent tumbler levers
employed in the safe deposit box lock;
FIGS. 6 and 7 are elevation views of a typical guard key, and
change key, respectively, for use in the lock of the present
invention;
FIG. 8 is a perspective view of the bolt of the safe deposit box
lock; and
FIG. 9 is a view similar to FIG. 3, showing the bolt in retracted
position, with portions of tumblers shown in phantom lines.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT
Referring to the drawings, wherein like reference characters
designate corresponding parts throughout the several figures, the
key operated, tumbler type, changeable lock for safe deposit boxes
of the present invention is indicated generally by the reference
character 10 and comprises a lock case 11 and a cover plate 12
removable therefrom. In accordance with conventional practice, the
lock case is a generally rectangular housing in the form of a
forwardly opening box-like configuration to be forwardly closed by
the cover plate 12, and comprises parallel top and bottom walls 13,
14, a rear wall 15, and end walls 16 and 17, the latter being
inclined slightly relative to the plane normal to the rear wall 15
and having an opening therethrough, indicated at 18, through which
the locking bolt 19 projects. The front cover plate 12 comprises a
front panel or wall 20 having a plurality of openings by which the
cover plate is fastened by screws or the like to the case 11 in
forwardly closing relation to the case. The cover plate 12 has a
pair of forwardly projecting horns or annular bosses 21, 22 one of
which serves as the renter horn, or horn for the renter key, and
the other of which serves as the horn for the guard or preparatory
key, and for the combination change key when the latter is used. In
the illustrated embodiment, the horn 21 is the renter horn and the
horn 22 is the guard horn. These horns 21 and 22 serve as outwardly
surrounding tubular bearings for the hubs or plugs, to be later
described, for the keys, and extend through the customary circular
openings provided therefor in the door of the conventional safe
deposit box cubicle or chamber. The corners of the lock case 11 are
provided with customary holes 23 extending therethrough for
fastening bolts projecting into tapped openings in the conventional
safe deposit chamber door to mount the assembled case and cover
plate against the inner surface of the door.
The bolt 19 for the safe deposit box lock, illustrated best in FIG.
8, includes the usual heavy bolt portion 19a which projects from
the lock case into a conventional keeper, and is guided by sliding
engagement along its upper and lower edges with guide surfaces 18a
bounding the opening 18, and includes a relatively thinner plate
portion indicated at 19b extending from the thicker nose portion
19a rearwardly through the major portion of the mechanism chamber
24 of the lock casing and terminating in a yoke or bifurcated end
portion defining vertically spaced upper and lower arms indicated
at 19c and 19c'. Openings 19d and 19e are provided in intermediate
portions of the locking bolt, and an integral fence 25 projects
rearwardly from the thicker bolt nose formation 19a at
substantially the vertical center or mid region of the bolt. A
tumbler mounting post 26 projects integrally forwardly from the
rear wall 15 of the case 11 through a slot extension 19f of the
opening 19g between the arms 19c and 19c' of the bolt, permitting
relative sliding movement of the bolt through its reciprocative
path between projected and retracted positions. Two types of
tumblers are mounted for pivotal movement on the tumbler posts 26
in interleaving or alternating relation. One type of tumbler is
referred to herein as guard key tumblers or pre-set tumblers 27,
having apertures in their mid-regions which fit about the tumbler
mounting post to pivot the tumblers 27 thereon. The tumblers 27
include a rearward tail portion 27a disposed in the zone of
operation of the guard key, a front gated portion 27b provided with
a gating recess 27c opening through the front edge of the tumbler,
and an arcuate recess 27d opening through the top edge of the
tumbler. The gating recesses 27c of the pre-set or guard key
tumblers 27 are designed to be alined in registry with the fence 25
of the bolt 19 when the proper guard key is inserted in the guard
horn 22 and is rotated, for example counterclockwise through
90.degree. from the 3 o'clock position, as viewed from the front of
the lock, to the 12 o'clock position to angularly position the
guard key tumblers about the tumbler post 26 to aline their gates
with the fence. The arcuate slots 27d in the guard key tumblers 27
are concentric with the axis of the tumbler posts 26 and slidably
receive an arcuate lug 28 which projects forwardly from the rear
wall 15 of the case.
The other type of tumbler if herein referred to as a renter tumbler
or segmented tumbler and is indicated by the reference character
29. The segmented tumblers 29 are interposed between successive
pairs of the pre-set or guard key tumblers 27, so that the two
types of tumblers occur in alternation, as will be apparent from
inspection of FIG. 2, and the segmented tumblers each comprise a
front gated section 30 having a gate recess 30a therein of
substantially the same configuration as the gate recesses 27c in
the pre-set tumblers 27, also designed to receive the fence 25 when
all of the gating recesses are alined with each other and in the
retraction path of the fence 25. The gated section of each
segmented tumbler also includes an arcuate slot 30b similar to the
slot 27d in tumbler 27, which slot 30b opens through the top edge
of the front tumbler segment 30, and follows an arcuate path
concentric with the axis of the tumbler post 26. The segmented
tumbler 29 also includes a rear body section 31 which includes a
medial portion 31a having a forwardly opening slot 31b therein, and
includes a rearwardly projecting, downwardly curved tail portion
31c and a forwardly extending arm 31d terminating in an arcuate set
of serrations or teeth 31t which intermesh with rearwardly
projecting teeth 30t on the rear edge of the front gated section 30
of the segmented tumbler. The slot 31b in the medial portion 31a of
the body portion 31 of the segmented tumblers receives the tumbler
mounting post 26 which defines a pivot axis for pivotal movement of
the segmented tumblers 29 while also permitting rearward
translational movement of the rear body section 31 of each
segmented tumbler under appropriate circumstances.
The center bores in the renter horn 21 and guard horn 22, and
alined circular apertures 15a and 15b in the rear wall 15 of the
case 11 form the journal openings for the rotatable key plugs or
hubs 33 and 34, each of the key plugs having a slot therein
extending from substantially the axis of the plug radially through
one side thereof to define the key way for the plug, indicated by
the reference characters 33a and 34a. A conventional annular insert
or bushing 35 may also be provided in the guard horn 22, as can be
seen in FIG. 2.
Fixed to the rear end portion of the key plug or cylinder 33 for
the renter's key, immediately inwardly of the interior surface of
rear case wall 15, is an actuator or drive cam 36 in the form of a
ring surrounding and fixed to the key cylinder 33, for example by
being keyed in a slot thereof, and having a radially extending
projection or tang 36a which normally occupies the opening 19e, and
which, after the guard key has been inserted and rotated to the 12
o'clock position in the key cylinders 34, is rotated clockwise from
the 9 o'clock position, as viewed from the front or in FIG. 3, by
the renter's key to bring the projection 36a into engagement with
the rear edge 19e' of the opening 19e and force the bolt to the
unlocking position of FIG. 9 withdrawing the bolt from locking
relation with the keeper surface (not shown). However, rotation of
the tang 36a beyond about a 1 o'clock position is prevented, as the
surfaces 19h of the bolt plate portion abut the change cam arcuate
surface 37a in the normal position of the cam 37, as shown in FIG.
9, preventing full retraction of the bolt.
The change cam member is rotatably journaled on the rear end
portion of the guard key cylinder 34 immediately adjacent the
interior surface of the rear case wall 15 and has a cam body
portion 37' provided with a forwardly opening eccentric slot 37b in
a constricted rectangular portion 37d thereof and having a
forwardly projecting arm member 37c which is diametrically opposite
the slot and extends forwardly through the full thickness of the
entire bank of tumblers at the arcuate portion 37a of the cam. A
spring ball detent 38 is also provided in the body portion of the
cam 37 from which the arm 37c extends and is resiliently biased
into restraining relation in either of two recesses 39 in the rear
wall 15 of the case to resiliently restrain the cam 37 in the
normal, inactive position shown in FIGS. 2 and 3 or in a key change
position displaced 180.degree. therefrom.
The pre-set or guard key tumblers 27 are normally biased to a
misalined, somewhat fanned position, for example as illustrated in
FIG. 3, by a guard tumbler spring member 40 having a concave
portion 40a which interfits onto a cylindrical mounting post of the
case and has a plurality of spring fingers 40b separated from each
other by narrow slots, pre-set to lie along slightly different
inclined axes and bearing against the lower edges of the guard
tumblers 27 to normally bias them to the position illustrated in
FIG. 3 wherein their gating recesses 27c are out of alinement with
each other and are spaced above the level of the fence 25.
Similarly, a spring member 41 for the segmented tumblers has a
concave base 41a interfitted about another cylindrical mounting
post of the case 11 and having curved spring finger portions 41b
separated laterally from each other by narrow slots and bearing
against the upper edges of the body portions 31 to urge the
segmented tumblers 29 to positions misaligning the gating recesses
30a relative to each other and spacing them out of alinement with
the fence 25.
In the following description of operation of the lock, the key
positions are indicated as viewed from the front of the lock or as
viewed in FIG. 3. In the operation of the safe deposit box lock,
the guard key, such for example as the key illustrated in FIG. 6
and indicated by the reference character 42, is inserted into the
key cylinder or plug 34 in the guard horn 22 and is rotated from
the 3 o'clock position to the 12 o'clock position disposing the bit
of the key in a vertical plane with the shaped edge of the bit
extending upwardly and bearing against the tail portions 27a of the
guard tumblers 27. This insertion and movement of the guard key 42
rocks the guard tumblers 27 about the tumbler post 26 to a position
alining each of the gating recesses 27c therein with each other and
with the fence 25 to accommodate retracting movement of the fence
and bolt. The proper renter's key is then inserted in the key
cylinder 33 of the renter's horn 21 and is rotated from a
horizontal 9 o'clock position clockwise to the 12 o'clock position
to bring the key bit into engagement with the inclined lower edges
31f of the body portions 31 of the segmented tumblers to rock the
segmented tumblers 29 about the tumbler post 26 to a position
disposing their gating recesses 30a in registry with each other and
in alinement with the fence 25. Additional rotation of the renter's
key clockwise from the upwardly extending 12 o'clock position
rotates the tang 36a of drive cam 16 into engagement with the
vertical bounding surface 19e' in the bolt plate, forcing the bolt
plate to the right, as viewed in FIG. 3, to retract the bolt to
normal unlocking position, which is the point where movement is
stopped by the change cam 37 by abutment of bolt surfaces 19h with
cam surface 37a. The drive cam 36 is therefore stopped by the bolt
at about the 1 o'clock position, preventing the renter key from
reaching the 3 o'clock key exit position. The end portions 19c and
19c' of the bolt have been moved out of their holding relation with
the constructed rectangular portion 37d of change cam 37 at this
unlocking position of the bolt. The spring ball detent 38 in the
body portion of the change cam 37 in recess 29 prevents
unintentional change cam movement.
When a renter key combination change is desired, the lock will have
to be brought to the normal unlocking condition shown in FIG. 9.
The guard key 42 will be rotated clockwise to the 3 o'clock key
exit position and removed without returning the renter's key to
exit position, the guard tumblers 27 being held in alined,
unlocking position by the fence 25 interfitting in the gates. A
guard change key 43 is then inserted into horn 22, fitting key
tongue 43a into slot 37b of the change cam 37. Rotation of the
change key 43 counterclockwise from 3 o'clock to 9 o'clock position
will effect rotation of the change cam 37, pushing spring ball
detent 38 out of recess 39. A complete rotation of 180.degree. will
bring change cam arm 37c into contact with cam follower surface 31c
separating segmented lever body 29 from segmented gated portion 30.
The spring ball detent 38 will go into recess 39A. When the
segmented lever portions 29 and 30 are decoupled and the change cam
37 is out of the holding relation with the bolt 19, (because the
midregion of its constricted portion 37d is radially shorter than
portion 37a) the drive cam 36 can move the bolt a sufficient
distance to reach the 180.degree. key exit position in renter horn
21. The old renter key can then be removed from the lock since it
can reach the 3 o'clock position, letting segmented lever body
portion 29 with spring pressure applied by spring 41 fall and rest
on renter plug 33. The segmented lever portion 30 remains in
unlocking position with its gating recess 30a receiving the fence
25.
A new renter key is inserted into the renter horn 21 at the 3
o'clock position and rotated counterclockwise to the 12 o'clock
position bringing the curved end portions 19c and 19c' of the bolt
into contact with the change cam 37. The new renter's key
combination provides lift on segmented lever body portions 29. The
guard change key 43 can now rotate change cam 37 clockwise out of
the spring ball detent recess 39A, bringing change cam arm 37c into
contact with the cam follower surfaces of segmeted lever body
portions 29 to the left of the guard plug 34, coupling segmented
lever portion 29 with segmented lever portion 30 at the new key
combination and coming to rest in the spring ball detent recess 39.
The renter key combination change is thus completed.
It will also be appreciated that in accordance with standard
practice, a set up key is provided by the manufacturer which is a
neutral key to which all changeable locks are set when shipped from
the factory and when not in use by the customer or renter, so that
the purchaser can initially set the safe deposit box locks to the
proper setting for the initial renter's keys. The insert 35 in the
guard key horn has a 90.degree. relieved sector in its inwardly
projecting rib to accommodate 90.degree. rotation of the guard key.
However, full rotation of the change key is permitted due to its
second notch in its shank as shown in FIG. 7.
* * * * *