US3774420A

US3774420A - Interlocking dead bolt lock and strike

Info

Publication number: US3774420A
Application number: US00149714A
Authority: US
Inventors: J Orr
Original assignee: Keystone Consolidated Industries Inc
Current assignee: AMERICAN BUILDERS HARDWARE Corp; Keystone Consolidated Industries Inc
Priority date: 1971-06-03
Filing date: 1971-06-03
Publication date: 1973-11-27
Anticipated expiration: 1990-11-27
Also published as: CA959089A

Abstract

An interlocking dead bolt lock and strike assembly having a lock housing enclosing a rotatable actuator for a lock bolt reciprocable between a retracted and a dead-locked position, an idler cooperating with the actuator for a key-operated lock actuation, and an extension on the housing acting to enclose the strike and cover the lock bolt in its projected dead-locked position. The housing may also include a reciprocable flag indicating when the bolt is projected, and an interior tumbler lock mounted on the housing which, when turned to one position allows the bolt to be operated by an exterior tumbler lock, and when rotated to a position 180* therefrom, prevents the exterior tumbler lock from operating the lock bolt.

Description

United States Patent 1191 Orr NOV. 27, 1973 [54] E E EE DEAD BOLT LOCK AND FOREIGN PATENTS OR APPLICATIONS 14,480 4/1912 Great Britain 292/ 140 [75] Inventor: John L. Orr, Rockford, Ill. 636,763 2/1962 Canada 70/432 [73] Assignee: Keystone Consolidated Industries,

Inc Peoria [IL Primary ExamznerMarv1n A. Champ1on Assistant Examiner-Lawrence J. Staab Flled: June 1971 Attorney-A. W. Molinare et al.

[21] Appl. No.: 149,714

[57] ABSTRACT [52] US. Cl 70/104, 70/ 131, 70/432, An interlocking dead bolt lock and strike assembly g 292/ 169.14 having a lock housing enclosing a rotatable actuator [51] Int. Cl. E05b 63/00, E05b 65/06 for a lock bolt reciprocable between a retracted and a [58] Field of Search 70/ 104, 129, 131, dead-locked position, an idler cooperating with the ac- 70/ 134, 142, 147, 152, 153, 432, 438; tuator for a key-operated lock actuation, and an ex- 292/ 140, 169 165, 182, 169.14, 169.17 tension on the housing acting to enclose the strike and I 1 cover the lock bolt in its projected dead-locked posi- [56] References Cited tion. The housing may also include a reciprocable flag UNITED STATES PATENTS indicating when the bolt is projected, and an interior 1,280,993 10/1918 Hammer 70 104 tumbler lock f f the housing which when 309 181 12/l884 woodrich at 70/l34 turned to one position allows the bolt to be operated 3,623:344 11 1971 Wartian 70/134 y an exterior tumbler lock, and when rotated to a P 1,177,152 3/.1916 Teich 70/438 sition therefrom, prevents the exterior tumbler 308,885 12/1884 Eames et al. 292/182 lock from operating the lock bolt. 963,632 7 1910 Nefllen et al.... 70 134 1,482,298 1/1924 Greenison 70 134 18 Chums, 35 Drewmg Flgul'es I 1 I I g .46 I 59 H11 1 I I Y\ 1 i, H I v i x l w 1 1 1 1 61 -Ll 76 1 l 2 \l-: 4 T #8 7' m 0 1 A l v/ J/O/ 4,20,, 93 l y F I I ag I l I i 66 '1 Q 0 t 4561 I I l l V a I I INTERLOCKING DEAD BOLT LOCK AND STRIKE The present invention relates to a novel interlocking dead bolt lock and strike assembly, and more particularly to a lock assembly having a lock housing with an extension to cover the strike and projected lock bolt, as well as a system involving both an interior and an exterior tumbler lock.

With the present alarming increase in robberies, theft and breaking and entering into business buildings, stores and homes, the problems of security have emerged as a national concern, thus increasing interest in security locks of the dead bolt and anti-picking types. In numerous installations, a dead bolt lock is uti lized along with a normal lockset incorporated in the door knob for an exterior entrancedoor or closure. Such a dead bolt lock is normally actuated by an interior knob or an exterior tumbler lock, and the lock usually has an interior slide button or lever to block movement of and dead lock the lock bolt to preventactuation from the exterior. However, many of these locks have lock bolts which can be retracted from the exterior by an unauthorized person using a thin metal or plastic sheet or plate which engages the inclined camming surface of the lock bolt through the opening between the door and the frame. The present invention provides a novel lock structure that prevents unauthorized retraction of the lock bolt and/or unauthorized operation of the exterior tumbler lock.

Among the objects of the present invention is the provision of a novel dead bolt lock assembly having an interlocking strike member. The strike member includes a plate secured to the door frame and a hasp receiving the outer end of the bolt when projected to its dead locked position. The lock housing has a cover extension beyond the end of the housing through which the bolt extends to enclose the strike hasp and form an interlocking assembly. 7

Another object of the present invention is the provision of a novel .dead boltlock assembly having a reciprocable lock bolt movable between a retracted and a dead-locked position. A rotatable actuator operates the lock bolt and is positively retained in either of the two bolt positions by detent means cooperating with the lock housing. The actuator positively engages the lock bolt so as to prevent forcible unauthorized retracting of the lock bolt by pressure at the exposed end of the bolt. An idler also cooperates with the actuator to provide rotation thereof upon operation of an exterior tumbler lock.

A further object of the present invention is the provision of a novel dead bolt lock assembly having a reciprocable flag in the lock housing operated by rotation of the actuator to project the flag when the lock bolt is advanced and thus provide a visual indication .that the bolt is in its dead-locked position.

The present invention also comprehends the provision of a novel dead bolt lock assembly having an interior tumbler lock cooperating with the actuator and idler and having two plug positions spaced by an arc of 180. In one plug position, the interior lock allows actuation of the lock bolt by the exterior tumbler lock while, in the other plug position, the tumbler lock prevents actuation of the bolt by the exterior lock.

The present invention further comprehends the provision of a novel dead bolt lock assembly with an interior tumbler lock acting to block exterior actuation of the lock bolt where the tumbler lock includes a rotatable plug having a keyway and pin tumblers therein and a lock cylinder having two sets of drivers and springs spaced apart to provide for two actuation positions of the lock plug.

Further objects are to provide a construction of maximum simplicity, efficiency, economy and ease of assembly and operation, and such further objects, advantages and capabilities as will later more fully appear and are inherently possessed thereby.

In the drawings:

FIG. 1 is a perspective view of the interlocking dead bolt lock and strike.

FIG. 2 is a rear elevational view of the lock assembly.

FIG. 3 is a cross sectional view of the lock assembly taken on the line 33 of FIG. 1.

FIG. 4 is a rear elevational view of the lock assembly with the rear plate removed and the strike hasp shown in cross section.

FIG. 5 is a view similar to FIG. 4 but with the parts rotated to project the bolt to dead-locked position.

FIG. 6 is a rear elevational view of the lock housing.

FIG. 7 is a partial vertical cross sectional view taken on the line 77 of FIG. 6.

FIG. 8 is a front elevational view of the rotatable actuator.

FIG. 9 is a vertical cross sectional view of the actuator taken on the line 99 of FIG. 8.

FIG. 10 is a rear elevational view of the reciprocable lock bolt.

FIG. 11 is a top plan view of the lock bolt.

FIG. 12 is a perspective view of a second embodiment of lock assembly having an indicator flag cooperating with the actuator.

' FIG. 13 is a rear elevational view of the lock assembly of FIG. 12 with the back plate removed and showing the bolt in retracted position.

FIG. 14 is a view similar to FIG. 13 but with the bolt and flag in projected position.

FIG. 15 is a front elevational view of the actuator showing the tabs for actuation of the flag.

FIG. 16 is a horizontal cross sectional view taken on the line l6-l6 of claim 15.

FIG. 17 is a rear elevational view of the flag.

FIG. 18 is a side elevational view of the flag taken from the right-hand side of FIG. 17.

FIG. 19 is a rear elevational view of the lock bolt for this embodiment.

FIG. 20 is a horizontal cross sectional view taken on the line 20-20 of FIG. 19.

FIG. 21 is a partial front elevational view of a third embodiment of the lock assembly with an interior tumbler lock replacing the rotatable knob.

FIG. 22 is an enlarged exploded perspective view showing a portion of the housing and the interior tumbler lock, the shifter and the actuator.

FIG. 23 is a rear elevational view of the interior tumbler lock.

FIG. 24 is a top plan view of the interior lock of FIG. 23 and showing the shifter in dotted outline.

FIG. 25 is a front elevational view of the bolt, the flag and the actuator, with the shifter shown in vertical cross section, and showing the position of the shifter and the actuator to block movement of the actuator with the bolt in dead-locked position.

FIG. 26 is a view similar to FIG. 25, but showing the position of the shifter and the actuator to block movement of the actuator with the bolt retracted.

FIG. 27 is a horizontal cross sectional view taken through the lock of FIGS. 25 and 26 assembled onto door. I

FIG. 28 is a horizontal cross sectional view taken through the interior lock.

FIG. 29 is a front elevational view of the actuator.

FIG. 30 is a vertical cross sectional view of the actuator taken on the line 3030 of FIG. 29.

FIG. 31 is a top plan view of the shifter.

FIG. 32 is a view similar to FIG. 31 with the shifter rotated 90.

FIG. 33 is a front elevational view of the shifter.

FIG. 34 is a rear elevational view of the shifter.

FIG. 35 is a vertical cross sectional view of the shifter taken on the line 35-35 of FIG. 34.

Referring more particularly to the disclosure in the drawings wherein are shown illustrative embodiments of the present invention, FIG. 1 discloses a dead bolt lock assembly and strike 11 to be secured to the door and frame, respectively, of an entrance or passageway to lock the door against entry by unauthorized persons. The strike 1 1 includes an L-shaped strike plate 12 with openings 13 in both flanges 14 and 15 to suitably secure the plate to the door frame (not shown). A U-shaped strike hasp 16 is staked to one flange 15 so as to extend inwardly from the frame and provide a passage or opening 17 to receive a bolt of the lock assembly.

The lock assembly 10 includes a lock housing 18 with a front or exterior wall 29,

side walls

21,21, anouter end wall 22 and an inner end wall 23 having an opening 24 for a reciprocable lock bolt. The housing 18 is provided with an extension 25 beyond the end wall 23 having a front wall 26,

side walls

27,27 and an end wall 28; the extension being open at the rear side at 29 to fit over and receive the strike hasp 16 therein. A removable rear wall or base 31 fits within a recess 32 in the housing to cover the rear open side of the housing 18 and enclose the lock components. The housing 18 is adapted to be secured to the interior surface ofa door (not shown) by conventional securing means through openings 33 in the housing 18 and in the rear wall 31.

The front wall 19 has an opening 34 (FIG. 7) therethrough providing an inwardly extending annular flange 35.acting as a bearing surface. A knob 36 (FIGS. 1 and 3) with an enlarged flange 37 adjacent the wall 19 of the housing 18 is provided with a bearing surface 38 and an inwardly extending cylindrical portion 39 adapted to be headed at 41 to be secured to a rotatable actuator 42. The actuator (see FIGS. 8 and 9) has a circular opening 43 receiving the portion 39 of the knob and is counterbored at 44 to receive the headed end 41. The actuator 42 is provided with a pair of substantially diametrically oppositely extending arms 45 and 46, with the arm 45 recessed at 47 to receive the inner end of a detent 48 (FIGS. 4 and 5) biased outwardly by a compression spring 49 positioned in the recess.

The detent 48 has a recess 51 in the inner end .to receive one end of the spring 49 therein and the outer end 52 of the detent is rounded. The outer end .wall22 of the housing 18 has an arcuate inner surface 53 provided with a pair of detent recesses 54 and 55 at the ends of the surface 53 spaced apart by an arc of approximately 90; each recess adapted to receivev the rounded end 52 of the detent 48 to provide the. limits of rotation of the actuator 42.

The opposite arm 46 terminates in a curved forward actuating surface 56, with the arm extending rearwardly, as seen in FIG. 4, to a narrow retracting end surface 57; the surfaces cooperating with a dead bolt 68. The actuator also has an enlarged arcuate recess 58 formed in one face extending over an arc of slightly greater than 90 with end surfaces or

shoulders

59,59 limiting movement of the idler 61. As seen in FIGS. 3 and 4, the idler 61 has a generally cylindrical body with one end 62 received in the counterbore 44 and the opposite end 63 received in an opening 64 in the rear wall 31. A radially extending partial flange 65 on the idler 61 has a radial car 66 received in the arcuate recess 58 to provide both for lost motion of the idler relative to the actuator 42 and to actuate the actuator by an exterior key-operated tumbler lock, such as shown in FIG.

' 27. The idler is provided with a slot or cross-shaped opening 67 therethrough to receive the tailpiece conventionally used on a tumbler lock.

A dead bolt 68 (see FIGS. 4, 5, l0 and 11) is reciprocably mounted in the housing 18 and has a locking body 69 terminating at the rear end in a lateral arm 71 having an offset rearward extension 72 received in an elongated guide recess 73 (FIG. 6) formed in the interior surface of the front wall 19. The extension has a recess 74 providing a rear retracting surface 75, an inclined camming surface 76 and a vertical locking surface 77 are formed at the rear edge of the bolt body 68.

Now considering the operation of the lock, the lock assembly 10 is secured onto the interior surface of a door and the strike 11 is secured onto the interior surface and edge of the door frame; the door having a conventional knob which may include a locking arrangement in the knob assembly. As seen in FIG. 1, with the dead bolt retracted, the door may be freely opened and closed and the extension 25 receives the strike hasp 16 therein to completely enclose the hasp when the door is closed.

FIG. 4 discloses the position of the lock when the dead bolt 68 is retracted into the housing 18. The actuator 42 is rotated with the detent 48 received in the lower recess 54 to retain the dead bolt in retracted position. The bolt 68 is projected to its deadlocked position, shown in FIG. 5 by manually rotating the knob 36, which simultaneously rotates the actuator 42 in a clockwise direction so that the actuating arm 46 and actuating surface 56 engage the inclined camming surface 76 to cam the bolt 68 to its projected position shown in FIG. 5. In this position, the detent 48 is received in the recess 55 to yieldably prevent rotation of the actuator 42, and the curved surface 56 on the arm 46 is positioned behind the vertical rear surface 77 of the bolt with the arm 46 being in an over-center position to deadlock the bolt in its projected position with the bolt body 69 received in the opening 17 defined by the strike hasp 16.

To retract the bolt 68, the knob and actuator are rotated in a counterclockwise direction, as shown by the arrow in FIG. 5, with initial rotation moving the surface 56 from behind the vertical bolt surface 77. Then the retracting end surface 57 engages the retracting surface on the bolt 68 to cam the bolt rearwardly, as guided by the rearward extension 72 in the elongated slot 73 in the housing 18, until the parts reach the position shown in FIG. 4.

, A key-actuated tumbler lock, such as shown in FIG.

v2 7, on the exterior of the door can also actuate the bolt the door and into the slot 67 in the idler 61. The recess 58with its

end walls

59,59 in the retractor 42 allows approximately 90 of lost motion for the idler 61 relative to the actuator 42 to return the key to its inactive position in the tumbler lock after actuation of the bolt in either direction.

The idler 61 is shown in its normal position in FIG. 4, and clockwise rotation of the idler by actuation of the tumbler lock causes the radial ear 66 to engage the adjacent wall 59 of the recess 58 to rotate the actuator 42 and project the bolt 68 to the position of FIG. 5; after which the idler 61 can be rotated in the opposite direction for 90, to the idlerposition-shown in FIG. 5 due to the lost motion arrangement, to return the key to a vertical position in the tumbler lock so the key can be removed therefrom. Rotation of the idler 61 in a counterclockwise direction from the position of FIG. 5 retracts the bolt to the position of FIG. 4.

FIGS. 12 through 20 disclose a second embodiment of the present invention having a lock assembly with a housing 18 and extension 25", a lock bolt 68, an actuator 42", an idler 61, and a strike having a hasp 16; with these parts being substantially identical to those shown in the first embodiment and carrying the same reference numerals as the embodiment of FIGS. 1 through 11 with the addition of a superscript a.

The difference in this embodiment is the addition of a flag 78, clearly shown in FIGS. 17 and 18; the flag eral arm 82, and a curved upright flange 83 on the body 79 and the arm 82; the flange terminating in a downturned end 84. The body 79 has an upper narrow end 85 defined by a shoulder 86 having a laterally projecting tab 87 thereon.

The housing 18 is provided with the opening 88 receiving the depending flag end 81 and a generally vertically aligned channel 89 perpendicular to and intersecting the guide slot 73. The actuator 42", as seen in FIGS. 15 and 16, is modified by the addition of a radially extending ear 91 spaced from the arm 46 and an annular extension 92 on the front wall 19 of the housing 18, which has a pair of arcuately spaced

radial tabs

93 and 94. The tab 93 is generally aligned behind the ear 91, and the tab 94 is generally aligned with the rear edge of the arm 46. The detent has been replaced by a detent ball 48" biased by the detent spring 49.

The actuator 42 also has a counterbore 95 formed in the rear surface (see FIG. 16) to receive the idler 61, and the idler 61" has an enlarged flange 65 extending over an arc of approximately 180 with the cylindrical end 63 extending therefrom. The flange 65 has the radial ear 66 integral therewith, and the counterbore 95 aids in defining the axis of rotation for the idler 61 along with the opening in the back plate (not shown).

Considering the operation of the lock with the flag 78 therein, FIG. 13 discloses the lock with the bolt 68" and flag 78 in their retracted positions. Rotation of theactuator 42 by either the knob 36 or the idler 61 in a clockwise direction causes the arm 46 on the actuator 42 to engage the inclined surface 76 of the bolt 68 and cam the bolt towards its projected position. As the actuator is rotated, the flag 78 will either drop by gravity or the car 91 acting on the flange 83 on the lateral arm 82 and the tab 94 acting on the shoulder 86 cams the flag 78' to project the depending end 81 from the opening 88 inthe housing and provide a visual indication that the bolt is in its dead-locked position, as seen in FIG. 14. With both the bolt 68 and the flag 78 projected, the tab 94 on the actuator 42" engages the shoulder 86 on the flag 78 to prevent retraction thereof unless the bolt is actuated to retracted position.

To retract the bolt and the flag, the actuator 42 is rotated in the counterclockwise direction so that the arm 46 engages the retracting surface to cam the bolt inwardly. After an initial rotation of approximately 60, the tab 93 behind the ear 92 engages the lateral tab 87 to retract the flag into the housing until the parts again reach the position of FIG. 13.

FIGS. 21 through 35 disclose a third embodiment of a lock assembly 10 where the knob on the exterior of the housing 18" is replaced with a novel tumbler lock 96 suitably secured to the front wall 19". Within the lock housing 18 are the actuator 42", the lock bolt 68", the flag 78 and the idler 61"; all of these parts, with the exception of the' actuator being identical to those shown in the second embodiment of lock.

The actuator 42", as shown in FIGS. 25 and 26, has the oppositely extending arms 45" and 46", a detent ball biased by a compression spring as shown in FIGS. 13 and 14, a radial ear 91, an annular extension 92" with the radial tabs 93" and 94", and the counterbore 95 in the rear face thereof. Within the extension is a radially inwardly extending stop 97 positioned intermediate the spaced tabs 93" and 94 and generally aligned with the forward edge of the arm 46". This stop 97 cooperates with a shifter 98 actuated by the tumbler lock 96.

The tumbler lock 96 differs from conventional keyoperated pin tumbler locks in providing two sets of spring-biased drivers 123 on opposite sides of the cylinder body 99, which cylinder body is generally square with diametrically oppositely extending

driver housings

101 and 102. The cylinder body 99 partially extends into an opening 103 in the wall 19" having axially extending grooves 104 to receive and position the corners of the cylinder body in the housing. A generally rectangular cover 105 has a recess 106 generally conformably receiving the cylinder 99 therein, and a pair of threaded openings 107,107 in the rear wall of the cover are aligned with openings 108,108 in the wall 19" to receive suitable securing means, such as the screws 109,109, to secure the lock 96 onto the housing.

The cover 105 has a central opening 1 1 1 to rotatably receive the enlarged face 113 of a lock plug 1 12 (FIGS. 22, 23 and 24), which extends through a generally cylindrical passage 114 in the cylinder body 99 with the inner end 115 projecting beyond the cylinder into the opening 103. The rotary plug 112 has an axially extending keyway 116 to receive a suitable key (not shown), and a plurality of lateral passages 188 intersect the keyway 116 and receive suitable tumbler pins 119. The

, cylinder body 99 has two sets of passages 121,122 in the

housings

101 and 102 to receive two identical sets of drivers 123 biased inwardly by compression springs 124.

The inner end 115 of the plug has an axial groove 125 (FIGS. 23, 28) formed in the exterior surface generally opposite the keyway to conformably receive a rib 126 on the shifter 98. The shifter, as seen in FIGS. 31-35 has a generally cylindrical body 127 with an enlarged cylindrical end 128 separated by a radial flange 129. A

cylindrical passage 131 extends axially through the shifter, with the enlarged end 128 being counterbored at 132 to receive the inner end 115 of the rotary plug 112. The radially inwardly extending longitudinal rib 126 is formed in the counterbore 132. Also, a radially extending ear 133 is formed on the cylindrical body 127 with the outer end of the ear being flush with the periphery of the radial flange 129 and longitudinally aligned with the rib 126.

With the lock 96 secured to the housing 18 and the shifter 98 positioned with its rib 126 in the groove 125 in the plug for simultaneous rotation, the actuator 42 is placed over the shifter 98 with the annular extension 92 receiving the cylindrical body 127 and the radial flange 129 thereof. The stop 97 in the actuator will now cooperate with the ear 133 on the shifter as will next be described.

In operation, the idler 61 actuated by the tumbler lock 134 and tailpiece 135 mounted in a door 137 operates the actuator 42" through the cooperation of the radial ear 66 and the shoulders 59" in the same manner as in the previous embodiments. As seen in FIGS. 21 and 22 the cover 105 has the inscription YES generally aligned with the driver housing 101 and the inscription NO generally aligned with the driver housing 102, and the plug 112 has an arrow 136 inscribed thereon diametrically opposite the open edge of the keyway l 16. The inscriptions refer to whether the tumbler lock 134 and the idler 61 are blocked from actuating the actuator 42" and the lock bolt 68".

As seen in FIG. 26, the stop 97 in the actuator is normally positioned adjacent the rear edge 77 of the lock bolt 68 when the lock bolt is retracted but slightly above the center line XX horizontally through the housing 18". With the rotary plug 112 rotated so the arrow 136 is opposite the NO inscription, the ear 133 on the shifter is generally aligned with the horizontal axis XX of the lock and positioned below the stop 97. With the arrow pointing to YES, the ear 133 is positioned 180 from the above mentioned position away from the stop and to the left as viewed in FIGS. 25 and 26.

Insertion of a proper key into the keyway 116 will raise the tumbler pins 119 so that the plane of abutment of the tumbler pins 119 and the associated set of drivers 123 will coincide with the shear line between the periphery of the plug 112 and the cylindrical surface of the passage 114 in the cylinder 99 to allow simultaneous rotation of the plug 112 and the shifter 98. Whether the plug is in the YES or NO position, the plug is rotated in a counterclockwise direction as seen in FIG. 26, so that the ear 133 is moved around to engage the upper edge of the stop 97 and rotate the shifter 98 to project the lock bolt 68" to its dead locked position previously described (FIG. 25).

When the bolt is in its projected position and the flag 78" is projected from the housing 18, the plug 112 is in the position with the arrow 136 pointing to NO, the ear 133 is positioned toward the bolt on the axis XX, and the stop 97 is below the axis XX and below and abutting the ear 133 (FIG. 25). If the key is then removed to lock the plug in the described position, the tumbler lock 134 (FIG. 27) can rotate the idler 61" until it engages a shoulder 59", but the interaction of the stop 97 with the now immovable ear 133 prevents the idler 61 from rotating the actuator 42 to retract the bolt 68".

Rather than leaving the plug 1 12 with the arrow 136 pointing to NO, the key may rotate the plug 112 in the opposite direction for to the YES position without affecting the position of the actuator or bolt where the ear 133 will be generally opposite the stop 97. Removing the key retains the plug in this position and, as the stop 97 is now spaced from the ear 133, rotation of the idler 61 will now cause rotation of the actuator 42 to retract the lock bolt 68 to its unlocked position.

With the bolt 68 in its projected dead locked position, rotation of the key, plug 112, and shifter 97 in the clockwise direction brings the ear 133 around underneath the stop 97 and, abutting the stop, causes rotation of the actuator 42" and retraction of the lock bolt 68 to the position of FIG. 26. The final position of the shifter 98 has the ear 133 adjacent the rear surface 77" of the bolt 68 with the stop 97 thereabove and the arrow 136 pointing to the NO inscription. Withdrawal of the key retains the plug 1 12 in the NO position so the exterior tumbler lock 134 cannot rotate the actuator 42" through the idler 61". Insertion of the key and rotation of the plug 112 to the YES position removes the ear 133 from abutment with the stop 97 and allows actuation of the actuator 42" by the exterior tumbler lock after removal of the key.

Thus, this third embodiment of lock provides a key actuation of the lock bolt by either an interior or an exterior tumbler lock, with the interior lock 96 providing a blocking position which will block actuation of the bolt by the exterior tumbler lock 134. The stop on the actuator and the ear on the shifter are so dimensioned in arcuate extent to provide for the actuation and positioning as above described.

I claim:

1. A dead-locking lock assembly for a door hingedly mounted in a door frame therefor, comprising a housing secured to the interior surface of the door adjacent the free edge thereof and having an opening in an end wall adjacent the free edge, a strike mounted on the door frame edge and having a passage therein, a lock bolt mounted in said housing for reciprocable movement between a retracted position and a projected position where the bolt partially extends through said opening into the passage in the strike, a camming surface on the rear edge of the bolt, an actuator having a camming arm cooperating with the bolt camming surface and a detent arm with detent means cooperating with an end wall surface of said housing opposite the wall facing the strike, said end wall surface including an arcuate interior surface with recesses therein to receive said detent means and maintain said bolt in at least a retracted or a projected position, said means to rotate the actuator to actuate the bolt, said camming arm being in an over-center position when the bolt is projected to deadlock the bolt in a projected position.

2. A dead-locking lock assembly as set forth in claim 1, including an extension of the housing at the end thereof having the opening for the bolt to cover the projected end of the bolt and the exposed position of the strike.

3. A dead-locking lock assembly as set forth in claim 2, in which said strike includes an L-shaped strike plate secured to two adjacent surfaces of the door frame and a strike hasp secured to the interior portion of the plate and forming the passage to receive the bolt.

4. A dead-locking lock assembly as set forth in claim 1, in which said rotating means is a knob mounted on the exterior of the housing and having an inwardly extending portion secured to said actuator.

5. A dead-locking lock assembly as set forth in claim 1, in which the end wall arcuate interior surface terminates at each end in a recess to receive the detent means in either of the two bolt positions.

6 A dead-locking lock assembly as set forth in claim 1, including an idler rotatably received in said housing and an ear on said idler, said actuator having an arcuate recess therein cooperatin with the ear to allow limited lost motion of the idler relative to said actuator.

7. A dead-locking lock assembly as set forth in claim 1, including a reciprocable flag mounted in said housing and having a depending visual indicating end, said housing having an opening in a side wall through which the indicating end projects when the bolt is in deadlocked position.

8. A dead-lockinglock assembly as set forth in claim 7, in which said flag and said actuator have cooperating means to reciprocate. said flag between the projected and retracted positions.

9. A dead-locking lock assembly as set forth in claim 8, in which said cooperating means includes a lateral ear on the flag adjacent one end and a lateral arm adjacent the indicating end to limit outward movement of the flag, and arcuately spaced tabs on the actuator cooperating with the lateral ear on the flag to reciprocate said flag between projected and retracted positions.

10. A dead-locking lock assembly as set forth in claim 9, including an upstanding flange on said flag body and the lateral arm; and a camming ear on the actuator adapted to cooperate with the flange to cam the flag to projected position.

11. A dead-locking lock assembly as set forth in claim 1, including a key-actuated interior tumbler lock, a rotary plug in said tumbler lock, a rotary shifter mounted in said housing and operatively connected to the plug, and means on said shifter and actuator to rotate the actuator and project or retract the bolt upon rotation of the plug by a proper key.

12. A dead-locking lock assembly as set forth in claim 1, including a key-actuated interior tumbler lock mounted on the exterior surface of said housing, a rotary plug in said tumbler lock, a rotary shifter mounted in said housing and operatively connected to said plug, an ear on the shifter and a stop on the actuator cooperating to rotate the actuator and project or retract the bolt upon rotation of the of the plug by a proper key.

13. A dead-locking lock assembly as set forth in claim 12, in which the ear is formed on the outer periphery of the shifter, and said actuator has a recess receiving the shifter and ear, and the stop is formed on the inner periphery of the recess.

14. A dead-locking lock assembly as set forth in claim 13, in which tumbler pins are positioned in said plug,.a lock cylinder receiving said plug and having two sets of oppositely disposed pin passages, a set of resiliently-biased drive pins for each set of passages so that the plug can be rotated to and the key removed at two oppositely disposed positions.

15. A dead-locking lock assembly as set forth in claim 14, in which one position of key removal positions the ear on the shifter adjacent to and abutting the stop on the actuator to prevent rotation of the actuator and, in the other position, the shifter ear is removed approximately from engagement with the actuator stop to allow rotation of the actuator, and second means to rotate the actuator when not blocked by the shifter ear.

16. A dead-locking lock assembly as set forth in claim 14, in which said second means includes an idler cooperating with said actuator for limited lost motion of the idler relative to the actuator and to rotate the actuator, and exterior lock means operatively connected to said idler to rotate the same.

17. A dead-locking lock assembly for a door hingedly mounted in a door frame therefor, comprising a housing secured to the interior surface of the door adjacent the free edge thereof and having an opening in an end wall adjacent the free edge, a strike mounted on the door frame edge and having a passage therein, a lock bolt mounted in said housing for reciprocable move ment between a retracted position and a projected position where the bolt partially extends through said opening into the passage in the strike, a camming surface on the rear edge of the bolt, an actuator having a detent arm and a camming arm cooperating with the bolt, detent means in the detent arm cooperating with said housing to hold the actuator and bolt in either the retracted or the projected position, means to rotate the actuator to actuate the bolt, said camming arm being in an over-center position when the bolt is projected to deadlock the bolt in projected position, and reciprocal flag means mounted in said housing, said flag means having a depending visual indicating end, said housing including an opening through which said visual end projects whenever said bolt is in the deadlock position, said actuator including cooperating means to reciprocate said flag between the projected and retracted position.

18. A dead-locking lock assembly for a door hingedly mounted in a door frame therefor, comprising a housing secured to the interior surface of the door adjacent the free edge thereof and having an opening in an end wall adjacent the free edge, a strike mounted on the door frame edge and having a passage therein, a lock bolt mounted in said housing for reciprocable movement between a retracted position and a projected position where the bolt partially extends through said opening into the passage in the strike, a camming surface on the rear edge of the bolt, an actuator having a detent arm and a camming arm cooperating with the bolt, detent means in the detent arm cooperating with said housing to hold the actuator and bolt in either the retracted or the projected position, means to rotate the actuator to actuate the bolt, said camming arm being in an over-center position when the bolt is projected to deadlock the bolt in projected position, and key actuated interior tumbler lock means mounted on the exterior surface of said housing with a rotary plug in said tumbler lock means, a rotary shifter mounted on said housing and operatively connected to said plug, an ear on the shifter and a stop on the actuator cooperating to rotate the actuator and project or retract the bolt upon rotation of the plug by a proper key, said ear being formed on the outer periphery of the shifter, and said actuator having a recess receiving the shifter and ear, the stop being formed on the inner periphery of the re-

Claims

6. A dead-locking lock assembly as set forth in claim 1, including an idler rotatably received in said housing and an ear on said idler, said actuator having an arcuate recess therein cooperatin with the ear to allow limited lost motion of the idler relative to said actuator.

7. A dead-locking lock assembly as set forth in claim 1, including a reciprocable flag mounted in said housing and having a depending visual indicating end, said housing having an opening in a side wall through which the indicating end projects when the bolt is in dead-locked position.

8. A dead-locking lock assembly as set forth in claim 7, in which said flag and said actuator have cooperating means to reciprocate said flag between the projected and retracted positions.

10. A dead-locking lock assembly as set forth in claim 9, including an upstanding flange on said flag body and the lateral arm, and a camming ear on the actuator adapted to cooperate with the flange to cam the flag to projected position.

14. A dead-locking lock assembly as set forth in claim 13, in which tumbler pins are positioned in said plug, a lock cylinder receiving said plug and having two sets of oppositely disposed pin passages, a set of resiliently-biased drive pins for each set of passages so that the plug can be rotated to and the key removed at two oppositely disposed positions.

15. A dead-locking lock assembly as set forth in claim 14, in which one position of key removal positions the ear on the shifter adjacent to and abutting the stop on the actuator to prevent rotation of the actuator and, in the other position, the shifter ear is removed approximately 180* from engagement with the actuator stop to allow rotation of the actuator, and second means to rotate the actuator when not blocked by the shifter ear.

17. A dead-locking lock assembly for a door hingedly mounted in a door frame therefor, comprising a housing secured to the interior surface of the door adjacent the free edge thereof and having an opening in an end wall adjacent the free edge, a strike mounted on the door frame edge and having a passage therein, a lock bolt mounted in said housing for reciprocable movement between a retracted position and a projected position where the bolt partially extends through said opening into the passage in the strike, a camming surface on the rear edge of the bolt, an actuator having a detent arm and a camming arm cooperating with the bolt, detent means in the detent arm cooperating with said housing to hold the actuator and bolt in either the retracted or the projected position, means to rotate the actuator to actuate the bolt, said camming arm being in an over-center position when the bolt is projected to deadlock the bolt in projected position, and reciprocal flag means mounted in said housing, said flag means having a depending visual indicating end, said housing including an opening through which said visual end projects whenever said bolt is in the deadlock position, said actuator including cooperating means to reciprocate said flag between the projected and retracted position.

18. A dead-locking lock assembly for a door hingedly mounted in a door frame therefor, comprising a housing secured to the interior surface of the door adjacent the free edge thereof and having an opening in an end wall adjacent the free edge, a strike mounted on the door frame edge and having a passage therein, a lock bolt mounted in said housing for reciprocable movement between a retracted position and a projected position where the bolt partially extends through said opening into the passage in the strike, a camming surface on the rear edge of the bolt, an actuator having a detent arm and a camming arm cooperating with the bolt, detent means in the detent arm cooperating with said housing to hold the actuator and bolt in either the retracted or the projected position, means to rotate the actuator to actuate the bolt, said camming arm being in an over-center position when the bolt is projected to deadlock the bolt in projected position, and key actuated interior tumbler lock means mounted on the exterior surface of Said housing with a rotary plug in said tumbler lock means, a rotary shifter mounted on said housing and operatively connected to said plug, an ear on the shifter and a stop on the actuator cooperating to rotate the actuator and project or retract the bolt upon rotation of the plug by a proper key, said ear being formed on the outer periphery of the shifter, and said actuator having a recess receiving the shifter and ear, the stop being formed on the inner periphery of the recess.