US3337252A - Locking-unlocking controls in latch face - Google Patents

Description

Aug. 22, I967 F. .1. RUSSELL ETAL 3 2 LOCKING-UNLOCKING CONTROLS IN LATCH FACE 5 Sheets-Sheet 1 Filed April 23, 1965 O S FEED Jl sgLz. R0652 J; Nam/v ATTORNEYS .A g- 22, 6 F. J. RUSSELL ETAL 3,337,252

LOCKING-UNLOCKING CONTROLS IN LATCH FACE 3% .g d m/Y ATTORNEYS United States Patent Filed Apr. 23, 1965, Ser. No. 450,447 2 Claims. c1. 29z 224 The invention here under consideration has reference to door locks which employ a latch bolt, operating means associated with the latch bolt to retract the latch bolt, and means located either above and/ or below the latch bolt which control whether the hand-hold is blocked or released to retract the latch bolt. Although a mechanism of this kind may be used in any one of a number of different types of door locks, it is found particularly useful in a mortise type lock; namely, one which fits into a recess which has been cut int-o the door from the free edge of the door.

Mortise locks often are selected when a rugged, high quality type of lock is needed. Typical installations for a high quality mortise type lock are installations for hotels, hospitals, and schools.

In locks which make use of a latch bolt, a great variety of expedients have been employed to block the hand-hold against retracting the latch bolt. Many of these expedients make use of accessory mechanisms which complicate the construction and add to the cost. In some instances, the mechanism used for blocking the hand-hold has not been sufiiciently obvious to make it easy for all kinds of persons to easily use the expedient. In other instances, where attempt has been made to have the operating mechanism particularly obvious, the mechanism has been objectionable because of being too large and unsightly or because it may be in the way of other lock operation. Some expedients are objectionable because they are not sufiiciently secure.

It is therefore among the objects of the invention to provide a new and improved door lock incorporating a simple, reliable, but relatively inexpensive expedient for blocking a hand-hold against retracting the latch bolt.

Another object of the invention is to provide a new and improved and relatively simple, secure expedient for blocking or unblocking'a hand-hold and one which subsequently cannot be disturbed by unauthorized means.

Still another object of the invention is to provide a new and improved door lock, particularly a lock of the mortise lock type, wherein the mechanism already present in the lock for other purposes may be taken advantage of in providing a dependable, positive acting means for blocking the hand-hold against rotation, thereby to lock the door by preventing retraction of the latch bolt by the hand-hold.

Still another object of the invention is to provide a hand-hold blocking mechanism which cannot be unblocked after the. dooris closed. I

Also included among the objects of the invention is to provide a relatively simple slide member accessible at the edge of the door, when the door is open, for blocking operation of one hand-hold or the other, and which is obvious and easy to operate without at the same time being such as. to interfere with other portions of the operating mechanism. The invention further contemplates a construction such that the lock can be changed by a simple,

easy expedient so that either the inside hand-hold or the outside hand-hold can be preventedvfrom retracting the latch bolt.

With these and otherob'jects in view, the invention consists in the construction, arrangement, and combination of the various parts of the device, whereby the objects contemplated are attained, as 'hereinafter set forth,

pointed out in the appended claims, and illustrated in the accompanying drawings.

In the drawings:

FIGURE 1 is a fragmentary view of a door, showing a typical mortise lock installation incorporating the invention.

FIGURE 2 is an end elevational view of the installation of FIGURE 1.

FIGURE 3 is a fragmentary vertical sectional view showing the lock mechanism in unlocked condition and as it would appear with the door opened.

FIGURE 4 is a fragmentary vertical sectional view similar to FIGURE 3, but with the parts in the position they would have with the door closed.

FIGURE 5 is a fragmentary vertical sectional view similar to FIGURES 3 and 4, but showing the position of the parts in locked condition. I

FIGURE 6 is a cross-sectional view taken on the line 66 of FIGURE 3.

FIGURE 7 is a crosssectional view taken on the line 7-7 of FIGURE 5.

FIGURE 8 is a fragmentary cross-sectional view taken on the line 88 of FIGURE 5.

FIGURE 9 is a fragmentary vertical sectional view taken on the line 99 of FIGURE 5.

A lock construction especially well adapted to the invention here under consideration is shown and described in copending applications, Ser. No. 450,446, filed Apr. 23, 1965; Ser. No. 450,450, filed Apr. 23, 1965; Ser. No. 450,- 460, filed Apr. 23, 1965; Ser. No. 450,461, filed Apr. 23, 1965; Ser. No. 450,462, filed Apr. 23, 1965; Ser. No. 450,- 472, filed Apr. 23, 1965.

In an embodiment of the invention which has been selected as one for showing a typical arrangement of structural parts involved in the invention, there is shown a mortise type lock indicated generally by the reference character 10, substantially all of which is housed within a case 11. An inside wall 12 and an outside wall 13 overlie at front end wall 14, a rear end wall 14', a top wall 15, and a bottom wall 15, and contain within them an appropriate chamber. Although a lock such as this customarily makes use of a dead bolt 16, the invention is here concerned more particularly with a latch bolt 18 reciprocatably mounted in the case 11 and extending outwardly through a hole 17 in the front end wall 14 and an aligned hole 17 in a front plate 21. A reciprocatably mounted auxiliary bolt 20 extends outwardly through a hole 19 in the front end wall 14 and an aligned hole 19" in the front plate 21. The case 11 is mounted in an appropriate recess 22 which extends inwardly from an end edge 23 of a door 24. The front plate 21 extends over a cutout portion of the end edge 23 and is secured by screws 25 to the front end wall 14. The front end wall 14 in turn, is secured to the end edge 23 by means of screws (not shown).

The lock 10, mounted as described upon the door 24, is adapted to cooperate with a frame 26 provided with a recess 27 containing a box 28 for a strike plate 29, secured to the frame 26 by screws 30. In the strike plate 29 is an opening 32 to accommodate the latch bolt 18. An extension 33 of the strike plate 29 serves to depress the auxiliary bolt 20 when the door 24 is .in closed position as shown in FIGURE 4. i

For customary locking and unlocking, the lock 10 is provided on the insidewith a turn mechanism 46, which may make use of a handle 49. On the outside is an appropriate key-actuated mechanism 47. These mechanisms are arranged so asto manipulate the dead bolt 16 through means not shown nor forming part of the present invention. The turn mechanism 46 and key-actuated mechanism 47, however, may be so arranged that they can, when needed, withdraw the latch bolt 18. For this purpose,

there is provided an actuator link 70 connected by appropriate means (not shown) to the key-actuated mechanism 47 which is provided with a flange 72 cooperating with a flange 73 on a rollback link 74. The rollback 74 is pivotally mounted on a pin 74' in the case 11, so that when the rollback link 74 is moved in a clockwise direction, as viewed in FIGURES 3, 4, and 5, by action on the actuator link 70, the action can move a head 75 of a latch bolt rod 76 in a direction from left to right, as viewed in FIGURES 3, 4, and 5, thereby to withdraw the latch bolt 18 against tension in a coiled spring 79. A pivot connection 77 attaches the latch bolt rod 76 to the latch bolt 18.

customarily, the latch bolt 18 is adapted to be withdrawn by operation of either an inside knob 85 or an outside knob 87. For this purpose, the inside knob 85 is provided with an inside spindle 86 which nonrotatably engages an inside rollback 88, the inside spindle 86 and inside rollback 88 being shown to good advantage in FIGURES 6 and 7. The outside knob 87 is provided with an outside spindle 86' nonrotatably attached to an outside rollback 88'.

When, for example, the outside knob 87 is to be operated to withdraw the latch bolt 18, the outside knob 87 and its attached outside spindle 86' is turned either clockwise or counterclockwise, as viewed in FIGURES 3, 4, and 5, so that either the end 98 or the end 91, as the case may be, may be moved against the adjacent end of a laterally reciprocating block 92, thereby to move it in a direction from left to right, as viewed in FIGURES '3, 4, and 5, against tension in a spring 78. The movement described impresses a cam 93, which is part of the block 92, against an adjacent portion of the rollback link 74, causing it to rotate in a clockwise direction about the pivot pin 74'. The movement described acts against the head 75 of the latch bolt rod 76 to withdraw the latch bolt 18 in the same manner as has already been described.

The auxiliary bolt 20, already referred to, is employed to block the latch bolt 18 from withdrawal when the auxiliary bolt 20 is depressed, as it would be with the door in closed position as shown in FIGURE 4. To accomplish this, the auxiliary bolt 20, guided in part by an auxiliary bolt lever 100 and in part by a slideway 120, presses a coiled spring 121 against a bell crank 117, which is pivotally mounted in the frame by means of a pin 119. As the bell crank 117 is thus rotated in a clockwise direction, as viewed in FIGURES 3, 4, and 5, a blocker 122, forming part of the bell crank 117, is tilted upwardly, to the position of FIGURE 4, against a stop 123 which is part of case 11. When the blocker 122 is in the position of FIGURE 4, it lies in the path of movement of the latch bolt 18 and, except for a permissive lost motion movement, blocks further movement outwardly of the latch bolt 18 from its engagement with the strike plate 29. It is by this means that the latch bolt 18 is prevented from being pried back whenever it is extended into the opening 32 of the strike plate 29. The latch bolt 18, however, can always be withdrawn by operation of the rollback link 74 or the actuator link 70 whenever either of these links can be manipulated in the manner heretofore described.

As the parts are assembled in the chosen embodiment, the outside knob 87 can be blocked against rotation and in this fashion prevented from withdrawing the latch bolt 18, while at the same time the inside knob '85 is unaffected. In this Way, the latch bolt 18 can be used to lock the door in closed position. To accomplish this, use is made of the outside rollback 88 in the circumference of which is provided a slot 127. The slot 127 is in transverse position when the outside rollback 88' is in the position shown in FIGURES 3, 4, 5, 6, and 7.

To make use of the slot 127, there is provided a holdback slide member 130 mounted to be moved in a vertical direction in the case 11. The hold-back slide member 130 extends outwardly through an opening 131 in the front end wall 14 and through an aligned opening 132 in the front plate 21, where it is accessible for manipulation when the door 24 is in open position, as in FIGURE 2. A crank 133 is pivotally mounted in the case 11 by use of a pin 134. An arm 135 of the crank 133 is pivotally secured to the hold-back slide member 130 by a pin 136. A second arm 137 of the crank 133 extends through an opening 138 in a blocking slide 139. As shown in FIG- URES 6 and 7, a tab 140 on one side of the blocking slidt 139 is reciprocatably mounted in a horizontal slot 141 in the outside wall 13. On the other side, a tab 142 is reciprocatably mounted in a horizontal slot 143 in the inside wall 12. In accordance with the foregoing description, when the hold-back slide member 130 is moved from the lower position of FIGURE 3 to the upper position of FIGURE 5, the crank 133 is rotated in a clockwise direction, as viewed in FIGURES 3 and 4, thereby moving the blocking slide 139 from the leftmost position of FIG- URES 3 and 4 to the rightmost position of FIGURE 5, where it enters the slot 127 in the outside rollback 88'. After this has been accomplished, the outside knob 87 and its attached outside spindle 86 can no longer be rotated. Consequently, the lat-ch bolt 18 cannot be withdrawn by manipulation of the outside knob 87, and the door 24 is effectively locked on the outside. Since there is no extentension and corresponding slot 127 on the inside rollback 88, the inside rollback 88 and, correspondingly, the inside knob remain unaffected by manipulation of the hold-back slide member 130.

To guard against prying of the hold-back slide member from its locked position when the door is closed and the latch bolt 18 locked in extended position, the hold-back slide member 130 is provided with shoulders 144 and 145, between which is a passage 146. A plate 147, carried by and forming part of the auxiliary bolt 20, is adapted to slide into the passage 146; and shoulders 148 and 149, respectively, on opposite sides of the plate 147, underlie the respective shoulders 144 and 145. As a consequence, the hold-back slide member 130 cannot be pried downwardly from outside the door 24, thereby to disengage the blocking slide 139 from engagement with the slot 127 in the outside rollback 88'. This is the solid line position of the auxiliary bolt 20 in FIGURE 5.

When the door 24 is open, the auxiliary bolt 20 can extend to the broken line position 20' of FIGURE 5. This moves the plate 147 out of engagement with the passage 146. Thereafter, the hold-back slide member 130 is free to be moved downwardly, thereby to withdraw the blocking slide 139 from engagement in the slot 127 of the outside rollback 88', and the outside knob 87 then becomes free to rotate and to manipulate the latch bolt 18 in the usual fashion. In the manner described, therefore, the outside rollback 88' and the auxiliary bolt 20, already installed in the lock 10 for other purposes, are made use of, when the door 24 is closed, to both deadlock the latch bolt 18 and prevent the hold-back slide member 130 to be moved to the position which would withdraw the blocking slide 139 from the above described engagement which blocks the outside knob 87 against rotation.

While the invention has herein been shown and described in what is conceived to be the 'most practical and preferred embodiment, it is recognized that departures may be made therefrom within the scope of the invention, which is not to be limited to the details disclosed herein, but is to be accorded the full scope of the claims, so as to embrace any and all equivalent devices.

Having described the invention, what is claimed as new in support of Letters'Patent is:

1. In a door lock, a case having an end wall at one edge, a latch bolt reciprocatably mounted in said case and extending outwardly through said end wall, a handhold assembly mounted on the casein operative engagement with the latch bolt, a slide stop mechanism movably mounted in the case, said slide stop mechanism including a single slide member having a vertically reciprocating sliding mounting in said end wall of said case, said mechanism having one position in blocking engagement with the handhold mechanism when the slide member is at one end of its vertical movement whereby to block movement of said handhold assembly and another position out of engagement with said handhold assembly, said end wall having an access opening therein in alignment with said slide member whereby to enable movement of said slide member and said slide stop mechanism from one of said positions to the other of said positions, an auxiliary =bolt mechanism reciprocatably mounted in said case for movement between an extended position outwardly of said end wall and a retracted position inwardly of said end wall, and interlocking means respectively on said auxiliary bolt mechanism and said slide stop mechanism, said interlocking means including a slot on one of said mechanisms and a projection on the other of said mechanisms, said projection being in engagement with said slot when said auxiliary bolt is in retracted position, whereby to prevent unauthorized movement of said slide stop mechanism to said other position While the auxiliary bolt is in retracted position, said projection being out of engagement with said slot when the auxiliary bolt mechanism is in extended position.

2. In a door lock, a case having an end wall at one edge, a latch bolt reciprocatably mounted in said case and extending outwardly through said end wall, a handhold assembly mounted on the case in operative engagement with the latch bolt, a slide stop mechanism movably mounted in the case, said slide stop mechanism having one position in blocking engagement with the handhold assembly whereby to block movement of said assembly and another position out of engagement with said handhold assembly, said end wall having an access opening therein in alignment with said slide stop mechanism and said slide stop mechanism including a vertically slidable member in said access opening exposed to the exterior and substantially flush with said end wall, whereby to enable movement of said slide stop mechanism by said slidabe member from one of said positions to the other of said positions, an auxiliary bolt mechanism reciprocatably mounted in said case for movement between an extended position outwardly of said end wall a retracted position inwardly of said end wall, and interlocking means respectively on said auxiliary bolt mechanism and said slide stop mechanism, said interlocking means comprising a slot on one of said mechanisms having respective complementary overhanging shoulder means, said projection being in engagement with said slot when said auxiliary bolt is in retracted posisition whereby to prevent movement of said slide stop mechanism to said other position while the auxiliary bolt is in retracted position said projection and said slot being out of engagement when the auxiliary bolt is in extended position to permit sliding movement of said slide stop mechanism to said other position out of engagement with said handhold assembly, and a blocker movably mounted in the case and in operative engagement with said auxiliary bolt,

said blocker having one position in blocking relationship 7 with said latch bo-lt when said auxiliary bolt is in retracted position and another position out of blocking relationship and said latch bolt when said auxiliary blot is in extended position.

References Cited UNITED STATES PATENTS 932,730 8/1909 Voight 151 X 938,444- 10/ 1909 Voight 70l51 X 980,180 1/1911 Arens et al 7 0151 3,159,994 12/1964 Schulz 292-207 X MARVIN A. CHAMPION, Primary Examiner.

EDWARD C. ALLEN, Examiner.

I. R. MOSES, Assistant Examiner.

Claims (1)

1. IN A DOOR LOCK, A CASE HAVING AN END WALL AT ONE EDGE, A LATCH BOLT RECIPROCATABLY MOUNTED IN SAID CASE AND EXTENDING OUTWARDLY THROUGH SAID END WALL, A HANDHOLD ASSEMBLY MOUNTED ON THE CASE IN OPERATIVE ENGAGEMENT WITH THE LATCH BOLT, A SLIDE STOP MECHANISM MOVABLY MOUNTED IN THE CASE, SAID SLIDE STOP MECHANISM INCLUDING A SINGLE SLIDE MEMBER HAVING A VERTICALLY RECIPROCATING SLIDING MOUNTING IN SAID END WALL OF SAID CASE, SAID MECHANISM HAVING ONE POSITION IN BLOCKING ENGAGEMENT WITH THE HANDHOLD MECHANISM WHEN THE SLIDE MEMBER IS AT ONE END OF ITS VERTICAL MOVEMENT WHEREBY TO BLOCK MOVEMENT OF SAID HANDBOOK ASSEMBLY AND ANOTHER POSITION OUT OF ENGAGEMENT WITH SAID HANDHOLD ASSEMBLY, SAID END WALL HAVING AN ACCESS OPENING THEREIN IN ALIGNMENT WITH SAID SLIDE MEMBER WHEREBY TO ENABLE MOVEMENT OF SAID SLIDE MEMBER AND SAID SLIDE STOP MECHANISM FROM ONE OF SAID POSITIONS TO THE OTHER OF SAID POSITIONS, AN AUXILIARY BOLT MECHANISM RECIPROCATABLY MOUNTED IN SAID CASE FOR MOVEMENT BETWEEN AN EXTENDED POSITIONS OUTWARDLY OF SAID END WALL AND A RETRACTED POSITION INWARDLY OF SAID END WALL AND INTERLOCKING MEANS RESPECTIVELY ON SAID AUXILIARY BOLT MECHANISM AND SAID SLIDE STOP MECHANISM, SAID INTERLOCKING MEANS INCLUDING A SLOT ON ONE OF SAID MECHANISMS AND A PROJECTION ON THE OTHER OF SAID MECHANISMS, SAID PROJECTION BEING IN ENGAGEMENT WITH SAID SLOT WHEN SAID AUXILIARY BOLT IS IN RETRACTED POSITION, WHEREBY TO PREVENT UNAUTHORIZED MOVEMENT OF SAID SLIDE STOP MECHANISM TO SAID OTHER POSITION WHILE THE AUXILIARY BOLT IS IN RETRACTED POSITION, SAID PROJECTION BEING OUT OF ENGAGEMENT WITH SAID SLOT WHEN THE AUXILIARY BOLT MECHANISM IS IN EXTENDED POSITION.

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