US 2669474 A
Description (OCR text may contain errors)
T. KANELL DOOR LOCK Feb. 16, 1954 5 Sheets-Sheet l Filed Dec. 24, 1949 l. l. :l
M /f/Lm/ @Tra/@MEX Feb. 16, 1954 T KANELL 2,669,474
1 DOOR LOOK Y Filed Dec. 24, 1949 5 Sheets-Sheet 2 if?. e.
BY Mg/w 4Filed Dec. 24, 1949 Feb. 16, 1954 T. KANELL 2,669,474
DOOR LOCK 5 Sheets-Sheet 3 soa@ MA1/5U.
TTOQMEX T. KANELL DOOR LOCK Feb. 16, 1954 5 sheetsheeefl 4 Filed DeC. 24, 1949 f ZMEQQQE INVENTOR.
Hmm/@NEVI- T. KANELL Feb. 16, 1954 DOOR LOCK Filed Dec. 24, 1949 'EODOQE KANELL .Zvl/ENTOQ. j// @Trae/Vey.
Patented Feb. 16, 1954 DOGR LOCK Theodore Kanell, West Haven, Conn., assigner,
by mesne assignments, tc Alexandria Kompaniez, Los Angeles, Calif.
Application December 24, 1949, Serial No. 134,963
This invention relates to door latches and locks.
Doors are equipped with latch bolts that extend into a recess in a door jamb, the recess being framed by a striker plate. Such latch bolts are commonly urged by spring pressure into latching engagement with the striker plate. A knob or handle provides means for retracting the latch when it is desired to open the door.
It is now quite common to lock the door by preventing the latch from being withdrawn from the striker plate. In this type of lock, one of the principal advantages resides in the simplicity of installation. No intricate pattern nor deep slot need be cut in the door to provide a recess for a lock; instead simple drilling operations usually suice for the installation of this type of door lock.
It is one of the objects of this invention to provide a combination door latch and lock of this character that is simple and inexpensive, and that is readily assembled for use in a door.
It is another object of this invention to make it impossible to remove the lock parts by disassembly of the mechanism unless the key is first used to unlock the door. In this way, access by an unauthorized person to the lock mechanism is effectively prevented.
Usually, removal of the lock mechanism from the door is effected by first removing one or both of the knobs or handles from the spindles. This can be done by urging a spring-pressed pin inwardly for releasing the knob. It is another object of this invention to prevent disassembly of the lock mechanism by ensuring that the pin cannot be moved to unlatching position until a key is used and moved to unlocking position.
in order to lock the door so that a key must be used exteriorly of the door to open it, a push button locking bolt operable from the inside is provided, which prevents operation of the knob on the exterior side of the door. 1t is another object of this invention to provide a simplied mechanism operating in this manner.
This invention possesses many other advantages, and has other objects which may be made more clearly apparent from a consideration of several embodiments of the invention. For this purpose there are shown a few forms in the drawings accompanying and forming part of the present speeincation. These forms will now be described in detail, illustrating the general principles of the invention; but it is to be understood that this detailed description is not to 'oe taken in a limiting sense, since the scope of the invention is best dened by the appended claims.
Referring to the drawings:
Figure 1 is an elevation of a door locking mechanism embodying the invention, and shown as installed in a door, the door being shown in horizontal section;
Fig. 2 is a horizontal sectional View, on a somewhat enlarged scale, of the mechanism shown in Fig. 1;
Fig. 3 is a vertical section, taken along a plane corresponding to line 3-3 of Fig. 2;
Fig. 4 is a vertical section, taken along a plane corresponding to line 4 4 of Fig. l;
Fig. 5 is a View similar to Fig. 4, but showing the latch grip and door latch in retracted or opening position;
Figs. 6, '7, 8, and 9 are vertical sectional views, on an enlarged scale, taken along planes corresponding to lines 6-6, 1 1, 9 8, and 9-9 of Fis. 3;
Fig. 10 is a fragmentary view similar to Fig.` 2, but illustrating the latch bolt in locking position;
Fig. ll is a fragmentary View of the latch bolt operating button in connection with the inner spindle, the button being shown in latch bolt releasing position;
Fig. l2 is a View similar to Fig. l1, but illustrating the latch bolt button in locking position;
Fig. 13 is a sectional view, taken along a plane corresponding to line I -IS of Fig. 11
Fig. 14 is an exploded pictorial view of the door latching mechanism;
Fig. l5 is a fragmentary View, similar to Fig. 2, of a modiiied form of latch bolt mechanism, the bolt being shown in released position:
Fig. 16 is a view similar to Fig. 15, illustrating the latch bolt in locking position and Fig. 1'7 is a sectional View, taken along a plane corresponding to line l l-I'l of Fig. 16.
The door l (Figs. l, 2, 3, and 4) is indicated as having a sloping edge Z intended to cooperate with a door jamb opening formed by the door frame 3. A door latch structure has a cylindrical casing 4 (see, also, Fig. 14) which is accommodated in the usual manner in a horizontal bore 5 extending from edge 2 into the door l. The latch bolt proper 8 is slidable within the casing 4. In this instance the latch bolt 8 carries a deadlatch ila that ensures against opening of the latch by urging the latch inwardly. The deadlatch structure is made the subject matter of another application.
Intersecting horizontal bore 5 is a transverse horizontal bore 6 which passes completely through the door l, and which is large enough to accommodate a housing structure 1 (see Figs.
y and l'I.
3 1, 2, 3, 4, and 14). This housing structure accommodates substantially all of the operating parts of the mechanism, as will be described hereinafter.
Latch bolt casing t is insertable into the bore 5, so that its inner end extends into the bore 6, as shown most clearly in Fig. 4. The lefthand end of the latch bolt casing carries a flange 8 which serves to support a plate It that is screwed to the edge of the door, as shown most clearly in Fig. 4.
When the door I is closed, the latch bolt 8 is projected through an aperture I8 formed in a striker plate I9 (Fig. 2). The striker plate I5 overlies a relatively deep recess 2i) in the vertical edge of the door jamb 3. The latch bolt 8 and the striker plate I9 cooperate in the usual conventional manner, except for the deadlatch which engages the inner side of the plate I9 and is released only When the latch bolt is retracted.
After the latch bolt casing 4 is installed in the bore '5, the housing 1, with its operating parts, can be slipped into the bore 6 from the left-hand side, as viewed in Fig. I. This housing 'i has a slot II at its left-hand side (Figs. 2, 4,75, and 6) cutalmcst to the right-hand end of the housing, as shown most clearly in Figs. l, 2 and 14.,
The casing i for the latch bolt 3 has its inner end interrupted, to form the segments I2. On the exterior of these segments there are opposite slots I3 within which the edges of the slot I! in the housing are accommodated as the housing I is moved toward the left, as viewed in Fig. 14. Thus the casing i and the housing 'I are kept in appropriate relative position.
The latch bolt proper 3 has an inner T-head I4 by the aid of which the latch bolt s may be retracted. The retracted position is indicated in Fig. 5. The mechanism for retracting the latch bolt 8 is enclosed in the housing 1.
As shown most clearly in Figs. 2, 4, and 5 the casing 4 has inwardly turned portions I5 that serve to hold the end Wall for the casing in place.
YIn order to simplify the assembly and structure of the mechanism, the housing 1 is formed of two substantially semi-cylindrical parts It and i1 (Figs. 4 and 5).
Each of the sections I 6 and I'I- is provided with oppositely directed half hubs. Thus, section I6 has half hubs 2I and 22, While section I'I has the cooperating hubs 23 and 24. When the sections are placed together, these half hubs serve as bearings for operating spindles. These halves are held in cooperating position by the Vaid of a pair ofcylindrical sleeves 25 and 26.
As hereinabove stated, the latch bolt proper E is retracted by the aid of the T-head I4. This T-head Ill is engaged by the latch grip 2'I (Figs. 3, 4, and 14). This latch grip may be conventionally formed of sheet metal having oppositely.
directed jaws 2S that engage the head I4. In the inactive position of Fig. 4, these jaws extend through the slot l i of the housing section I5.
The remainder of the latch grip 2 is formed in a rectangular box-like manner. Its side Walls are guided by the projections integrally formed onV the end walls of the housing members IS These projections are shown to best advantage in Figs. 4; 5, 6, and 7.
Thus, the housing section I6 is provided with the integrally formed bosses 29 and 3D opposing the outer side of the wail of the latch grip 21. An integrally formed guide '3| is opposed to these two guides 28 and 3D to cooperate with the inner surface of the latch grip.
Similarly arranged integral guides 32 and 33 are disposed on the section at the opposite side of the latch grip. The guide 34 on section I'I cooperates with these guides 32 and 33 to form a guide for the opposite wall of the latch grip 2'I.
The latch grip 2l' is adapted to be urged resiliently toward the position shown in Fig. 4, in which the latch bolt s in locking position. For this purpose, the inner wall 35 of the latch grip has an aperture guided on a stationary post 36 (see, particularly, Figs. 2, 4, 5, and 14). This post has a head 3l against which the outer wall of the latch grip is urged by the compression spring 33. This compression spring surrounds the post 33.
The post 36 may be conveniently attached to the housing section H, as, for example, by the aid of the screw 39.
The mechanism for moving the latch grip 2'I to the opening position of Fig. 5 may now be described. Stamped out Vof the opposite sides of the latch grip 2 are the inwardly directed projections 4Q. These extend toward each other and are spaced sufficiently apart so that the head 3'I of post 3E will not interfere with the inward movement of the latch grip 2l'.
An outer spindle il is rotatably supported Within the half hubs 2l and 23 (see, particularly, Figs. 2, 3, and 14). Radial projections 42 extend externaliy oi this spindie and engage the end wall oi the housing i to prevent outward movement of the spindle ai I. inward movement is prevented in a manner to be hereinafter described.
The spindle fl! is hollow, and a part of it is removed at the inner ,endV in order to iorm a segmental conguration, closed by the end iange or segmental wall 43.
The edges 44 (Figs. 4 and 14) of this end overlie the inwardly directed projections 35. In the normal position of Fig. 4, the spindle 4I is in the inactive position. Now, by turning the spindle 4I in either direction, either one or the other edge fifi of the segmental portion 43 operates on one or the other of the inwardly directed 40 of the latch grip 2i. Thus, as shown in Fig. 5, if the spindle ii be rotated in a counter-clockwise direction, as viewed in that gure, the lower cor- .er of the segmental wall 43 engages the lower projection urging the latch grip toward the right and compressing the spring 33. This causes retraction of the head ifi and corresponding retraction of the latch bolt 3. Obviously, a similar action is produced when the spindle LiI is rotated in a'clockwise direction.
spring attached to the spindle 4I near itsY inner end. Normally this spring holds the coupling pin in projected position.
The spindle t! has a slot 49 at its upper side. This slot lig is widened at its outer end to form Aan outer slot 55. This slot, as shown most clearly in Fig. 3, accommodates a vane `5 I. This vane 5I serves to position a cylindrical locl; 52 at the end of the spindle al. This lock 52 carries an operating member 53 that can be rotated only when a key, such as 56 (Fig. 1)is inserted into a keyhole in the end of the cylindrical lock 52. Otherwise, as will be explained hereinafter, turning of the key 54 will serve to move the latch grip 21 to opening position.
Thus, the operator 53 (see, especially, Figs. 6 and 8) is accommodated in a slot 55 formed in the outer end 56 of the key spindle 51. This key spindle is rotatable within the outer spindle 4| and is spaced from the outer spindle 4| bythe aid of the spacer projections 58 formed on the inside of the spindle 4|. When the key 54 is inserted in the lock 52, the operator 53 is turned. In turning, this operator causes the inner segmental end 59 of the spindle 51 to depress the projections 4i] of the latch grip 21. This inner segmental end 59 of the key spindle 51 extends to the segmental end wall 43 of spindle 4|. As shown most clearly in Fig. 2, it overlies the inwardly directed projections 40. This inner key spindle 51 is also shown in Fig. 10.
When the key 54 isused, the knob 45 may remain stationary, since only the operator 53 is moved by operation of key 54. However, when the knob 45 is turned without use of the key 54, the lock 52 is bodily turned, due to the coupling between vane 5| and slot 50. In this way, the segment 59 of the key spindle 51 will be rotated by operator 53, and will permit outer spindle 4| to open the latch.
The inner spindle 6o is rotated similarly to spindle 4| within the half hubs 22 and 24. It is provided with the outwardly directed projections 5| engaging the inner surface of the wall of casing 1 to prevent outward movement of the spindle 6l). As shown most clearly in Figs. 2 and l0, the inner ends of the spindles 4| and 6D approach quite closely together substantially at the center of the housing |1. Thus, these ends prevent material inward movement of the spindles.
The inner end 52 of the spindle 60 is cut away to form a segment. This segment is adapted to engage the projections 4U of the latch grip 21. Accordingly, by rotation of the inner spindle 611 in either direction, the latch 8 may be retracted.
A knob structure 63 telescopes over the spindle 55 and may be held detachably in place by the aid of a coupling pin B4 (Figs. 2 and 9). This coupling pin 54 is carried by a iiat spring 65 attached near the outer end of the spindle 5|).
The assembly of the parts, as thus far described, is apparent from the foregoing. The cuter and inner spindles 4| and 6!) are placed between the halves i5 and I1 of the housing 1. The rings 25 and 26 are then slipped over the hubs 2|-23 and 22-24- of the housing 'l to hold the two parts of the housing together. Before the knobs 45 and 63 are disposed over the spindles, the rosettes 66 and 61 are passed over these rings. These rosettes carry the attaching plates B8 and 69 overlying the bore 6 in the door. As shown most clearly in Figs. 3, 4, 5, and 6, spacer posts 1l! are attached to the attaching plate 68 and pass through the housing sections I6 'and |1. These posts are internally threaded for the accommodation of the screws 1| passing through the attaching plates 69. Rosettes 63 and G1 serve to conceal these screws. As the axial length of the housing 1 is substantially less than the width of the door spacers may be introduced between the attaching plates and the outer wall of the housing 1.
The cuter knob 45, as heretofore stated, is held in place on the outer spindle 4| by the; aid of the coupling pin 41. It is possible, of course,
rto disassemble to the entire lock structure by urging the pin 41 `inwardly against the resilience of the spring 48 by an appropriate instrument, and thereafter removing knob 45 and operator 53.
By the present arrangement, inward movement of the pin 41 is prevented, thereby preventing such removal of the knob 45 unless the key 54 is in the opening position. For this purpose, the spring 48 carries an inwardly turned end 12 (Figs. 2 and 8). This inwardly turned end 12 closely approaches the edge of the operating member 53. While this operating member 53 is in the locking position, the pin 41 cannot be urged inwardly. When the operating member 53 is turned, by aid of the key in the lock 52,` the spring 48 is unimpeded and the parts may be disassembled.
Provisions are made for locking the outer spindle 4| against rotation, thereby making it necessary to use key 54. This locking eiect can be such that the key spindle 51 can nevertheless be operated by thekey.
The locking mechanism for the spindle 4| is shown to best advantage in Figs. 2, 3, and l0. As shown most clearly in Fig. 4, the head 31 of the post 36 is slotted. The slot in this head is in alignment with a slot 13 of the segmental wall 43 of spindle 4|. Accordingly, in order to prevent rotation of the spindle 4|, a locking bolt can be moved so as to be interposed between these two slots. Such a locking bolt 14 is arranged to be slidable Within the inner spindle E0. It has a projection 15 that is in continual guiding relation with the slot in the head 31. This bolt 14' has a wider portion 16 which extends downwardly so as to be engaged in the slot 13 when the bolt 14 is moved toward the left, as shown in Fig. 10. In this position, the bolt 14 now acts as a lock to prevent rotation of spindle 4| with respect to the head 31. This bolt does not engage the key spindle 51 and, therefore, there is no restraint against opening of the door by the use of the key 54.
The sliding bolt 14, as shown most clearly in Fig. 7, is quite flat and extends in a horizontal direction. It is provided with a shank portion 11 (see, also, Fig. 9) to which is rotatably connected a push button 18 that is slidable in the open end of the spindle 60 (Figs. 11, 12, and 13). A washer 19 surrounds thestem 11 and is abutted against an interrupted flange formed on the inner surface of the spindle 60. In the assembled position of Figs. 2 and 10, the washer 19 serves asv an abutment for the left-hand end of a compression spring 8|. In the unlocked position of Fig. 2, the push button 18 is urged by the spring 8| to its extreme right-hand position, indicated in Fig. l1. When it is desired to lock the outer spindle 4| the push button 18 is urged inwardly to assume the position of Fig. l0. The corresponding inward movement of the bolt 14 operates to lock the spindle 4|.
The push button 18 may be retainedin the locked position by the aid of a projection 82 (Figs. 1l, 12, and 13) which is accommodated in a slot 83 at the end of the spindle. This slot 83 extends in an axial direction and connects with Aan arcuate slot 84 formed in the spindle 60. At
the end of this arcuate slot, as shown most clearly in Fig. 11, a seat 85 is provided for the projection 82. In this way the button 18 may be rotated so as to bring the projection 824 into the seat 85 to retain the lock.14'in lockingA position.
Spring 8| urges projection 82 into the seat 85.-Z
In order to release the lock, the push button 18 may be pressed slightly inwardlytoraise the projection '82 from the seat, yand then itmay be turned to the position of Fig. 1l. The spring 8l then urges the push button 18 outwardly and also urges the lock 1liv tothe-releasing position of Fig. 2. 4
The button 18, of course, is so mounted that it is freely rotatable with respect'to the stem 'i1 of lock 14. 4
Since the push button 18 must be urged inwardly to a position where it may drop into seat 85, the bolt 14 must travel somewhat past its locking position. In order to permit the bolt to pass temporarily to that position, the inner end of the key spindle 51 has Ia slot 86. v
The bolt 14, with the washer i9, spring 8 I, and push button 18 may be rst assembled with the spindle BD before the spindle 60 is assembled with the housing 1. The bolt i4 has a wide portion -81 which engages the flange 89, limiting expansion of the spring. Removal of the'lcck 14 is also prevented with respect to spindle Gil. However., by turning the lock 'M through a ninety de- '15, 16 and 17, the locking bolt 90' is assembled with a push button 9i which does not need to be turned in order to hold the locking bolt in locked position. For this purpose, a hairpin' spring 92 is provided which, as shown in Fig. 17, straddles the locking bolt Sil. The ends of this hairpin spring are formedinto loops for theaccommodation ofl attaching rivets which pass through the locking bolt S0. Y
The free upper end of the hairpin spring is urged resiliently against the inner wall of the inner spindle 93. When the button 9| is urged inwardly, this upper free end of the spring slips into a restraining aperture 94. .The end of the spring 92 is thus retainedV in place in the locking position.
The bolt 92 may be permitted to return to the unlocked position by the aid of aslight rotation l of the inner spindle 93. yThe end edges of the elongated aperture 94 act as Acams upon rotation Y of the spindle 93 to urge the hairpin spring 92 inwardly. As soon as a slight rotation is effected,
the hairpin spring is urged out of the opening 94, and the spring 8| urges the locking member 90 to theopen position.
The inventor claims:
l. In `a device of the character described: a,
2. In a device of the character described: a pair ofV hollow generally half-cylindrical members, said members cooperating to form a pair ofhollow bearinghubs on opposite ends of said members, each of saidv members: -forrning one opposed half respectively .of eachl bearing hub;
8 an inner spindle rotatable in one hub; another spindle rotatable in the other hub; and sleeves respectively engaging the hubs for maintaining the members in assembled position.
3. In a door latch structure cooperable with a latch grip: a housing formed of a pair of hollow generally half-cylindrical members, said members ,cooperating to form a pair of hollow bearing hubs on opposite ends of said housing, each of said members forming one opposed half respectively of each bearing hub; means detachably securing the members together; an inner spindle rotatable in one hub; and an outer spindle rotatable in the other hub; said members including parts providing a sliding guide for said latch gr1p.
4. In a door lock mechanism: a housing; a latch grip movably mounted in the housing; a first rotatable spindle extending into one side of the housing for operating the latch grip; a sec-ond rotatable spindle extending into the housing at'the opposite side thereof; a lool: bolt longitudinally movable in the second spindle cooperating with the iirst spindle to restrain said rst spindle from rotating; meansV urging the bolt in releasing direction; and a spring detent carried by the bolt and having a projection adapted to engage a recess in the second spindle for holding the bolt in locking position; said spring detent being urged to disengaging position by the edge of the recess when the said second spindle is rotated.
5. In a door lock mechanism: a housing; a latch grip movably mounted in the housing; a rst rotatable spindle extending into one side of the housing for operating the latch grip; a second rotatable spindle extending into the housing at the opposite side thereof; said rst spindle having a slot; a lock bolt longitudinally movable in the second spindle; a stationary guide for the bolt; said bolt when moved inwardly being engageable in said slot for locking said iirst spindle; means urging the bolt in releasing direction; and a spring detent carried by the bolt and having a projection adapted to engage a recess in the second spindle for holding the lbolt in locking position; said spring detent being urged to disengaging position by the edge of the recess when said second spindle is rotated.
5. In a door lock mechanism: a housing; a latch grip movably mounted in the housing; a rst rotatable spindle extending into one side of the housing for operating the latch grip; a second rotatable spindle extending into the housing at the opposite side thereof; said rst spindle having a slot; a lock bolt longitudinally movable in the second spindle; a stationary guide for the bolt; said bolt when moved inwardly being engageable in said slot for locking said first spindle; means urging the bolt in releasing direction; and a spring having legs straddling the lock and fastened thereto, said spring also having a. free end engageable in a recess in the second spindle for holding the bolt in locking position; said spring being urged to disengaging position by the edge of the recess when said second spindle is rotated. Y
7. In a door latch mechanism: a housing; a headed post extending transversely of the housing and fixed to a wall of the housing; a latch grip slidable in said housing, said latch grip having a guiding aperture accommodating said post, the-head of the post limiting movement of the latch grip in one direction; a spring surrounding .the post and urging the latch grip against said head; a rotatable spindle having a part engaging the latch grip for urging the latch grip away from the head; said part and the head of the post having aligned slots when the latch grip is in engagement with the head; and a lock bolt carried by the housing and selectively movable to engage both said slots to prevent rotation of said spindles.
8. In a door latch mechanism: a housing; a headed post extending transversely of the housing and fixed to a wall of the housing; a latch grip slidable in said housing, said latch grip having a guiding aperture accommodating said post, the head of the post limiting movement of the latch grip in one direction; a spring Surrounding the post and urging the latch grip against said head; a rst rotatable spindle having a part engaging the latch grip for urging the latch grip away from the head; said part and the head of the post having aligned slots when the latch grip is in engagement with the head; a lock bolt for engaging said slots; and a second rotatable spindle extending in a direction opposite to the rst spindle, said lock bolt being supported in said second spindle.
9. In a door latch mechanism: a two-part generally cylindrical housing; a headed post attached to the interior of one of the parts of the housing and extending toward the other part; a latch grip guided by the housing for sliding movement from one cylindrical wall to the other, and having a guiding aperture accommodating said rst post, the head of the post limiting movement of the latch grip; a compression spring surrounding the post and urging the grip against said head; a first rotatable spindle extending axially of the housing and into the housing, said spindle having projections limiting outward movement of the spindle; said irst spindle also having an inner end engaging the latch grip which upon rotation of the first spindle serves to move the latch grip away from the head; a second rotary spindle extending axially of the housing in a direction opposite to the direction of the rst spindle, said second spindle having projections limiting outward movement of the spindle; said second spindle having a latch grip operating inner end serving upon rotation of the second spindle to move the latch grip away from the head; the ends of the spindles being closely spaced to limit inward movement of the spindles with respect to the housing; the end of the iirst spindle and the head having aligned slots when the latch grip is in engagement with the head; and a lock bolt slidable in the second spindle for engaging said slots.
10. In a door latch mechanism: a housing; a post extending transversely of the housing and xed to a wall of the housing; a latch grip slidable in said housing, said latch grip having a guiding aperture accommodating said post; means forming an abutment limiting movement of the latch grip in one direction; a spring surrounding the post and urging the latch grip against said abutment forming means; a rst rotatable spindle having a part engaging the latch grip for urging the latch grip away from said abutment forming means; said part and said post having slots that are aligned when said latch grip is in engagement with said abutment forming means; a lock bolt for engaging said slots; and a second rotatable spindle extending in a direction opposite to the rst spindle, said lock bolt being supported in said second spindle.
11. In a door latch structure: a hollow generally cylindrical housing split along an axial plane and provided with bearing hubs on. opposite ends of said housing; spindles respectively rotatable in said hubs and extending outwardly of the housing; said spindles each having radially extending parts preventing removal of the spindles from the housing; and a pair of sleeves telescopingly received by the hubs respectively for maintaining the members in assembled position.
THEODORE KANELL. References Cited in the ille of this patent UNITED STATES PATENTS Number Name Date 626,341 Phelps June 6, 1899 1,489,675 Schlage Apr. 8, 1924 1,691,528 Schlage Nov. 13, 1928 1,755,434 Ellingson Apr. 22, 1930 1,829,815 Schlage Nov.. 3, 1931 1,876,079 Schlage Sept. 6, 1932 1,876,885 Ellingson Sept. 13, 1932 1,971,580 Schlage Aug. 28, 1934 1,991,031 Schlage Feb. 12, 1935 2,007,350 Schlage July 9, 1935 2,038,907 Schlage Apr. 28, 1936 2,062,765 Schlage Dec. 1, 1936 2,293,856 Schlage Aug. 25, 1942 2,299,180 Schlage Oct. :20, 1942 2,301,751 Schlage Nov. 10, 1942 2,611,635 Cerf, Jr Sept. 23, 1952