|Publication number||US3815390 A|
|Publication date||Jun 11, 1974|
|Filing date||Oct 30, 1972|
|Priority date||Oct 30, 1972|
|Publication number||US 3815390 A, US 3815390A, US-A-3815390, US3815390 A, US3815390A|
|Original Assignee||Boston Lock & Safe Co Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Referenced by (21), Classifications (13)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States atent [1 Stoia 1 June 11, 1974 LOCK FOREIGN PATENTS OR APPLICATIONS 352,419
4/1922 Germany 292/140 r- 1 1- l //a //0 Primary ExaminerAlbert G. Craig, Jr. Attorney, Agent, or Firm-Wolf, Greenfield & Sacks  ABSTRACT The deadbolt of a lock mechanism is operable from either side of the door by means of a pair of independently operable cams controlled, respectively, on the inside by a knob and on the outside of the door by a key-cylinder arrangement. The lock may also be operable and controlled from the inside by a key-cylinder arrangement. Each of the cams is arranged to release a detent mechanism which normally restrains the deadbolt from movement from either of its effective length of the key-cylinder which is unique and adjustable to accomodate a range of door thicknesses. The lock also includes an arrangement by which the outside cover plate cannot be tampered with to gain forceful entry.
14 Claims, 10 Drawing Figures m nnow n 1914 38151390 SHEH 10$ 2 r LOCK SUMMARY OF THE INVENTION As shown in FIGS. 1 and 2 the lock is intended to be My lock includes a deadbolt which normally is re- 5 mounted on the interior side of a door l and it in strained between its unlocked or locked positions by a channel which slidably receives the bolt and which cooperates with a detent secured to the bolt. The detent and channel are arranged so that the detent will abut either of the opposite ends of the channel when the deadbolt is in either of its locked or unlocked position. The channel is movable transversely of the deadbolt to enable the detent of the deadbolt to be aligned with a slot formed in the channel parallel to the deadbolt. When the channel has been moved to a transverse position aligning its slot with the detent, the deadbolt then may slide to its other position with the detent passing freely through the slot in the channel. The channel movement is controlled by either of a pair of independently operable cams, one cam being operable from inside the door and the other being operable from the outside with an appropriate key. Each of the cams also includes means for urging the bolt to either of its positions. The lock also includes a key-cylinder arrangement which cooperates with 'one of the cams in the manner to enable the lock to be fitted to any of a number of doors of various thicknesses. The tamper-proof characteristics of the lock are enhanced further by a special outside cover plate which reduces the likelihood of th lock being effectively tampered with from the outside. 4
It is among the object of my invention to provide an improved heavy duty tamper-proof lock mechanism.
Another object of the invention is to provide an improved lock mechanism which is of relatively simple construction.
A further object of the invention is to provide a lock mechanism which issubstantially jam-proof.
Still another object of the invention is to provide a lock mechanism which reduces the possibility of malfunction.
A further object of the invention is to provide a lock which is adjustable to fit a range of doors of varying thicknesses without requiring special modification either to the door or the lock.
DESCRIPTION OF THE DRAWINGS The foregoing and other objects and advantages of the invention will be understood more clearly from the following detailed description thereof, with reference to the accompanying drawings wherein:
FIG. 1 is an illustration of the lock and keeper as mounted on a door with the deadbolt in a locked configuration;
FIG. 2 is an illustration of the lock shown in FIG. 1 as seen along the lines 2 2 of FIG. 1;
FIG. 3 is an elevation of the look as seen from the front side thereof without the door and with part of the outside cover plate being broken away;
FIG. 4 is a section taken through the lock as seen along the line 4 4 of FIG. 3;
FIGS. 5 8 show the interior of the lock in various stages as the lock is operated to shift the deadbolt;
FIG. 9 is a view of the interior of the lock housing cover; and
FIG. 10 is an illustration of that of the cams which is operable from the outside of the door.
cludes a hollow casing 12 having appropriate holes formed therethrough to receive fastening screws 14. A deadbolt 16 is slidable along lts longitudinal axis so that it may be engaged or disengaged with a keeper 18 secured to the door jam 20. Appropriate openings are formed in the sidewalls of the casing 12 to enable the opposite ends of the deadbolt 16 to pass therethrough.
The deadbolt may be operated either from the inside by either a knob or key, or from the outside by the key. In some instances it may be desirable to employ a key operated device on the inside as well as the outside of the door. The knob 22 and cylinder arrangement 26 are constructed so that they may be-employed to throw the deadbolt in either direction independently of each other. This is accomplished by employing either a pair of cams 28, 30 disposed within the casing 12 and which are operated respectively by'the knob 22 and cylinder arrangement 26. As described below, rotation of either of the cams is effective to release the detent which restrains the bolts and thereafter cause the bolt to be moved in the desired direction.
The deadbolt 16 is restrained in either of its locked or unlocked positions by means of a detent pin'or screw 32 which is secured to the bolt. The detent pin 32 is located along the length of the bolt 16 so that when the bolt is in either the lockedor the unlocked position the detent will be disposed adjacent either ofthe ends of a channel shaped member 34 (see FIGS. 5 and 8). Abutment of the detent pin 32 with either end of the channel precludes movement of the deadbolt 16 in the intended direction. The interior of the casing 12 also includes a cutout portion which defines a pocket 36 within each side of the casing to receive the pin 32 when the bolt is in either the locked or unlocked position.
The channel 34 which includes inside and outside walls, 38 40 normally rests on top of the deadbolt 16 with the deadbolt being received within the channel between the walls 38, 40. Means, such as the compression spring 42 are provided to bias the channel 34-towards the bolt 16 in the configurationshown in FIGS. 4 and 5. When the lock parts are in this position, the deadbolt 16 is unable to move and it is securely locked.
In order to release the deadbolt 16 for movement to the opposite position, aslot 44 is formed at the interior surface of one of the walls 40 of the channel-34 and on th same side of the lock as the detent pin 32. The bolt 16 is released by moving the channel 34 transversely and away from the bolt 16 (upwardly as seen in FIG. 4) to bring the detent pin 32 into alignment with the slot 44. Once the pin 32 and slot 44 have been aligned the bolt 16 is then free to be moved. The transverse movement of the channel 34 is effected by either of the knob cam 28 or key cam 30. Each of these cams is of circular configuration except for a flat chordal segment 46, 48, formed onthem, respectively. The chordal segments 46, 48 of the cams 28, 30 are intended to bear against the lower ends of the walls 38, 40 of the channel 34 when the lock is in either the locked or unlocked configuration (FIGS. 4 and 5).
g The earns 28, 30 are supported with the casing 12 for rotation along a common axis which extends centrally through the earns, the knob 22 and the cylinder assembly 26. As illustrated in FIGSJS and 6, when one of the cams is rotated from its normal position its chordal segment engages the end of its associated channel wall and urges the channel transversely of and away from the deadbolt l6 (upwardly as seen in the drawings). The diameter of the cams and the other dimensions of the parts of the lock are such that when the end of one of the channel walls is engaged by the circular part of the cam the channel will have been moved to the position shown in FIGS. 6 and 7 inwhich the slot 44 in the channel is in alignment with the detent pin 32 on the deadbolt 16. As described below, further rotation of the cam'is effective to thereafter urge the bolt to the other position. The slot 44 is maintained in alignment with the detent pin 32 during movement of the bolt by the circular shape of the cam which maintains the channel in the proper position during rotation of the cam and movement of the bolt.
In order to shift the deadbolt from one position to another, the bolt includes a pair of transverse slots 50, 51 disposed in spaced relation at the midportion of the deadbolt 16. The slots 50 receive and cooperate with drive pins 52, 53 which are mounted to the inner surfaces of the cams and are spaced radially from the central axis of the cams. The slots 50, 51 and drive pins 52, 53 are arranged so that as either of the cams is rotated its drive pins will successively enter into andengage the posite sides of the aligned pin and slot. The lowe end of each of the slots may be flared to facilitate entry of the pins.
Thus, as shown in FIG. 6 as one of the cams is rotated the channel 34 is raised and simultaneously the pin 52 is rotated upwardly into the slot 50 of the deadbolt 16. When the channel has been raised to a height in which its slot 44 is aligned with the detent pin 32 continued rotation of the cam maintains the channel at that position while the drive pin 52 urges the bolt-l6 to the right as shown in FIG. 6. As shown in FIG. 7 as the rotation of the cam is continued, the pin 52 withdraws downwardly from the slot 50 while the other pin 53 moves upwardly into engagement with the slot 51 to continue advancement of the bolt to the right. FIG. 8 shows the parts just before the cam has completed one complete revolution with the bolt in its fully shifted position in which the drive pin 53 has withdrawn from the slot 51 I and with the channel 34 moving downwardly to its original position as permitted by engagement of the chordal surface of the cam with the lower end of the channel wall. Returnof the channel 34 is assisted by the com-- locks into position, with the bolt in either locked or unlocked position. After the channel has been returned to its original position with its slot 44. out of alignment with the dedetent pin 32 the bolt is then restrained in its shifted position. The bolt may be returned by rotating either of the cams in the opposite direction with the operation of the parts merely being reversed.
In the illustrative embodiment of the invention, the cams 28, 30 and channel 34 are guided in their respective movements by the shape of the hollow interior of the casing 12. In this embodiment the inside of the easing is of oblong configuration with parallel sidewalls 54 to guide the channel 34. The lower end of the hollow area is circular to receive and guide the circular cams 28, 30. The other, upper end of the hollow interior is shown as also being of circular shape although other shapes could be employed. l-Iere, however. it should be noted that the upward movement of channel 34 is limited by the circuiar shape of the upper portion of the hollow interior. Other arrangements may be employed to limit the extent of upward travel of the channel.
My invention also includes an arrangement by which the locks may be attached to a variety of doors of different thicknesses. This is achieved by the key-cylinder arrangement 26 which can be threaded into the lock to the extent desired so as to vary the distance between the lock casing 12 and the front cover plate 56 which bears against the outside surface of the door. In this regard, the interior of the casing I2 is enclosed by a casing cover .58 which is secured to the casing 12 by screws 60 threaded into holes 62 formed in the casing 12. The casing cover 58 has a threaded opening 64 in alignment with the axis of the cams. The opening 64 receives the threaded end of a barrel 66, the other end of the barrel 66 threadably receiving the front cover plate 56. Means are provided for locking the barrel 66 in place after it has been threaded into the casing cover 58 to the desired extent. This includes a longitudinal slot 68 formed along the exterior of the barrel 66 which receives a movable key 70. The key is biased downwardly (see FIGS. 3 and 4) by a spring arrangement 72 and is guided for movement toward and away from the barrel by a slot 74 formed in the casing cover.58. In order to remove or adjust the axial position of the cylinder arrangement 26 the key must first be raised out of the slot 68 to enable the barrel 66 to be rotated. Raising of .the keys 70 is facilitated by'a serrated surface 76 on the key .70.
In order to enable the key cam 38 to be operated by the key 24, the cylinder arrangement 26 includes a tumbler mechanism 78 rotatably mounted within the barrel 66. The tumbler mechanism 78 is of the type which is freely rotatable within the barrel 66 and the key24 only after the key has been inserted into the tumbler mechanism 78. In order to transmit rotation of the tumbler mechanism to the key cam 30 a hollow extension 80 is secured to the inner end of the tumbler mechanism 78 for rotation therewith within the barrel 66. The extension 80 is connected to the key cam 30 by a square or other irregularly shaped plunger 82 having one end slidable within the hollow extension 80 and the other extending out of a square opening in the other end of the extension. The outwardly projecting end of the plunger 82 is received within a complementary depression 84 formed in the surface of the key cam 30. It is biased into the depression 84 by a spring 86 disposed within the extension 80. The spring-plunger arrangement insures that the end of the plunger 82 will be in firm engagement with the key cam 30 in all the adjusted positions of the cylinder arrangement 26.
In order to enable the cylinder arrangement 26 to be securely threaded into the casing cover 58 the interior of the cover is provided with a boss 88 having a threaded interior to receive the end of the assembly 26. Because of the boss 88 the arrangement for mounting the key cam 30 is somewhat different than that for the knob cam'28. The key cam 30 includes a circular ridge 90 which 'isrotatably received within a shoulder 92 formed at the inner surface of the boss 88. Cooperation of the circular ridge 90, shoulder 92, and the engagement of the circular periphery with the circular hollow of the casing and engagement of the inwardly facing surface of the key cam 30 with the side of the bolt 16 effective to retain the cam 30 in its proper position. The knob cam 28 is retained in its proper position and alignment.
A further aspect of the invention relates to the manner in which the front cover plate 56 is attached to the lock assembly to enhance the tamper-proof characteristics of the lock. The front cover plate 56 has a central threaded hole 96 which is adapted to be screwed onto the end of the assembly 26 which projects through the front of the door. Embedded within the cover plate 56 is a radially extending pin 98 which is slidable within a radially extending-cavity 100 in the plate 56. The pin 98 is biased radially inwardly by a spring 102 and'is retained within the cavity by a flange 104 at its outer end. After the lock mechanism has been attached to the door and front cover plate 56 is screwed onto the front end of the assembly 26 by first depressing pin 98 to enable the threads on plate 56 to engage the threaded end of the assembly 26. The front cover plate 56 then can be rotated until the pin 98 becomes aligned with a longitudinal slot 104 formed along the surface-of the barrel 66. The pin 98 then snaps into the slot 106 which precludes further rotation of the cover plate 56. The parts are dimensioned so that when the pin 98 snaps into its locking position the front face of the cover plate 56 will be flush with the front end of the cylinder assembly 26. The front cover plate 56 as well as the exposed parts of the cylinder assembly 26 are made from a hardened steel to resistdrilling through parts of the lock.
When the lock is attached to the door it can only be removed by first removing the front cover plate 56. This in turn can be done only from inside the door and by using a slender probe 108 to disengage the pin 98 of the slot 106 and enable the front cover plate 56 to be backed off. In order to provide access for the probe from the inside of the door, the casing 12, cams 28, 30 and casing cover 58 are each provided with holes 110, 112, 114, 116 respectively which are arranged in alignment when the lock parts are either in a locked or unlocked position. In order to remove the lock from the door the inside knob 22 is first removed by backing off the set screw 118 to expose the aligned holes 110, 112, 114, 116. The probe 108 then can. be inserted through these holes and into and along the slot 106 to slide the end of the probe through a hole 102 formed in the backside of the front cover plate 56 and into engagement with the inwardly extending end of the pin 98. The end of the probe 106 is wedge-shaped to cooperate with the convex inner end of the pin 98 to urge the pin radially outwardly from the slot 106. The front cover plate 56 then can be backed off. The screws 14 then can be removed and the lock mechanism can be withdrawn inwardly from the door. The tamper-proof plate also prevents unauthorized removal of the lock case from the back of the door preventing entry to the outside, other than with the key. (This applies only to double-key-cylinder arrangement wherein another keycylinder is utilized on the inside or back of the lock case instead of the knob.)
In addition to the security afforded by the heavy duty construction and tamper-proof characteristics of the lock, further feature of the lock is that it may be installed in any attitude such as with the bolt being movable vertically or in an attitude inverted from that shown in the drawings. This enhances the versatility of the lock and makes it adaptable for use with practically any type of door arrangement. The lock may be installed without opening the casing which eliminates possibility of improper installation The lock construction also includes a fail-safe feature in that regardless of the attitude in which the lockis installed it can always be opened from the inside by turning the knob irrespective of the attitude which the lock was installed.
It should be understood that the foregoing description of the invention is merely to be illustrative thereof and that other embodiments and modifications may be apparent to those skilled in the art without departing from the spirit.
Having thus described the invention what I desire to claim and secure by Letters Patent is:
l. A lock mechanism comprising:
a deadbolt slidable along an axis within said casing, said deadbolt having an end thereof extending throughian opening formed in said casing;
a detent member within said casing and being mounted therein for movement transversely of the axis of said deadbolt;
said detent member having a surface thereof facing a surface of said deadbolt, said surface ofsaid detent member having a slot formed therein which extends along a direction parallel to said axisv of said deadbolt;
means forming a projection on said deadbolt extending from said face thereof, said projection being alignable with said slot in said detent member when said detent member is moved to a predetermined position in relation to said deadbolt;
a first cam mounted with said housing, said first car'n being operable from one side of said casing for moving said detent member to said predetermined position to enable said deadbolt to move along said axis, said first cam further including means for thereafter moving said deadbolt along said axis;
a second cam disposed within said housing and being operable from the other side of said housing for moving said detent member to said predetermined position to enable said deadbolt to move along said axis, said second cam means including means for thereafter moving said deadbolt along said axis;
said first and second cams being dently of each other.
2. A lock as defined in claim 1 further comprising;
said member being in the'form of a channel having a pair of spaced walls, said deadbolt extending through said channel between said walls with said walls straddling said bolt;
each of said channel walls being operably engageable by one of said cams.
3. A lock as defined in claim 1 wherein said means on said first and second cams for moving said deadbolt comprises:
means forming at least one slot in said bolt;
at least one pin mounted to each of said cams, said pins being disposed in relation to said slot in said bolt so that when each of said cams is operated,
operable indepensaid pin wili engage said slot after said detent member has been moved, said cam pin and slot being arranged so that continued movement of said cam will urge said deadbolt along said axis thereof.
4. A lock as defined in claim 1 further comprising:
means biasing said member transversely towards said dead-bolt.
'. A lock as defined in claim 2 further comprising:
each of said cams being circular in shape and being mounted for rotation within said casing on the opposite side of the dead-bolt and that on which said channel is disposed, each of said cams being mounted in alignment with the free ends of one of said channel walls, each of said cams having a flat chordal portion adapted to engage its associated end of its associated channel wall.
6. A lock as defined in claim 5 wherein said cams are mounted for rotation along a common axis.
7. A lock as defined in claim 5 wherein said means mounting said cams for rotation comprises: the hollow interior portion of said lock casing defining. circular surfaces on that side of said bolt in which said cams are mounted, said circular surfaces receiving said cams.
8. A lock as defined in claim 2 further comprising:
the interior of said casing defining a hollow portion which extends transversely of said deadbolt, said hollow portion defining wall surfaces in sliding engagement with the ends of said member to guide said member in said movement thereof.
9. A lock mechanism comprising:
a deadbolt slidable along an axis within said casing, said deadbolt having an end thereof extending through an opening formed in said casing;
detent means within said casing engageable with said dead-bolt for precluding movement of said deadbolt along saidaxis;
a first cam mounted within said housing, said first cam being operable from one side of said casing for moving said detent means to a position in-which said deadbolt is free to move along said axis, said first cam further including means for thereafter moving said deadbolt along said axis;
a second cam disposed within said housing and being operable from the other side of said housing for moving said detent means to a position in which said deadbolt is free for movement along said axis,
said second cam means including means for thereafter moving said deadbolt along said axis;
said first and second cams being operable independently of each other;
a barrel having a key-circular disposed therein at one end thereof, said key-circular being rotatable within said barrel in response to insertion of a key into said key-cylinder;
means threadably mounting the other end of said barrel to said casing along an axis which is coaxial with at least one of said cams;
means connecting said key-cylinder to said one of said cams;
said threadable mounting means for said barrel being constructed to enable saidbarrel to project from said easing into a variable extent to enable the effective barrel length to be adjusted to accomodate doors of varying thickness; and
means for locking said barrel to said casing.
10. A lock as defined in claim 9 wherein said means connecting said key-cylinder to said one cam comprises;
a plunger connected to the other end of said keycylinder for rotation in unison therewith; means biasing said plunger awayfrom said cylinder and toward said one cam; and said one cam including socket means receptive to said plunger for engagement therewith to enable said one cam to be rotated in unison with said keycylinder. 11. A lock as defined-in claim 9 wherein said means for locking said barrel to said casing'comprises:
means forming a longitudinal keyway exteriorly of said barrel and intersecting the threaded end thereof adapted to be screwed into said casing; and
a key mounted to said casing for movement toward and away from the threaded end of said barrel and means biasing said key toward said barrel to normally engage said keyway.
12. A lock as defined in claim ll further comprising:
said key being exposed through said casing at the same side thereof from which said barrel extends, said side being adapted to bear against the inside surface of a door whereby said key is hidden when said lock is mounted on said door.
13. in a lock mechanism including a casing a bolt slidable along an axis extending through a casing and means inside said casing operable to slide said bolt along its axis, an improved arrangement for securing said lock to a door or the like comprising, in combination:
a barrel having a key-cylinder disposed therein at one end thereof, said key-cylinder rotatable within said barrel in response to insertion of a key into said cylinder;
means threadably mounting the other end of said bar rel to said casing;
means connecting said key-cylinder to said bolt operating means;
said threadable mounting means for said barrel being constructed to enable said barrel to extend from said casing to a variable extent to enable the effective barrel length to be adjusted to accomodate doors of varying thickness;
means for locking said barrel to said casing in said adjusted position including means forming a longitudinal key-way exteriorly of saidbarrel and intersecting the threaded end thereof adapted to be screwed into said casing and a key mounted to said casing for movement toward and away from the threaded end of said barrel and means biasing said key'toward said barrel to normally engage said keyway.
14. In a lock adapted to be mounted on a door including a lock mechanism secured to the interior of said door and a key-cylinder arrangement mounted to said lock mechanism and extending through an opening in said door with the end of said cylinder arrangement being exposed at the front of said door, an improved cover plate comprising:
said cover plate having threaded hole formed therethrough adapted to be screwed on to the outwardly exposed end of said cylinder arrangement;
a pin mounted within said front cover plate and extending radially thereof, said pin being movable between a locking position in which the inner end thereof extends radially into said hole and an unlocked position which said pin is retracted into said cover plate;
means biasing said pin radially inwardly;
means forming a slot on the exterior threaded end of said cylinder arrangement, said slot being constructed and arranged as to receive said pin when cept through said passage.
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|U.S. Classification||70/134, 292/140, 292/150, 70/370, 70/461, 70/381|
|International Classification||E05B9/00, E05B9/06, E05B63/00|
|Cooperative Classification||E05B63/0056, E05B63/006, E05B63/0017|