US1723063A

US1723063A - Door latch

Info

Publication number: US1723063A
Application number: US603650A
Authority: US
Inventors: Fredrick M Nelson
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-11-27
Filing date: 1922-11-27
Publication date: 1929-08-06
Anticipated expiration: 1946-08-06

Description

Aug. 6, 1'929. F. M. NELSON i DOOR LATCH Filed Nov. 27, 1922 2 Sheets-sheet 1 6/ s J4 55 JF 7'@ f6 62 65 f8 62 Z9 5 d 5a Q3 6/ 'je 64 ,f 5 5o MM a 32 44 76- 27 2*65 77 60 i E J5 56 'oq 60a' 66 a 1 J/ 4o 47 66 \f-.\ 67 5a /F 9 gj 62 59a 59o 69 /4 2/ r62)" /7/3 @if Of'ny.

"Aug.6, 1929. 4 t .EM-'NELSN K 1,723,063

DOOR LATCH Filed Nov. 27. 1922 2 sheets-snm 2 j 3 /0 l /QZ /05'v 9 6 /7 9 v his Attorney.

. there are no unsightly Patented Aug. 6, 1929i FREDRICK AM. NELSON, OF LOS ANGELES, CALIFORNIA.

DOOR LATCH.

Application filed November 2*?, 1922.

The present invention relates generally to door latches, and particularly it pertains to a mechanism, in combination with a standard type of door-lock, whereby a door may be leftv ajar and securely held against further openino. In use it is for the purpose of locking the door ajar, such as for admitting a greater circulation of air to a room, and so limiting its opening movement as to prevent the unauthorized entrance l,of intruders.y I

The invention is particularly characterized by a mechanism. which may be automatically connected with a door, to limit r its opening movement, or disconnected therefrom, merely by turning the door knob which throws the main bolt; and after being thus connected it cannot be disconnectedto furthe-r open the door-while the door is open.

The parts are so designed and constructed and the arrangement is such that pract-ically all of the parts are concealed from view.; so

attachments exposed to mar the finished appearance of the door -rnd its casing.

The details of the mechanisms and their arrangement, together withtheir mode of operation, will be more fully set forth in the following specification; reference being made therein to the accompanying` drawings, which form a part thereof, and in which:

Fig. 1, is a fragmentary perspective view showing the invention in use;

Fig. 2, is a fragmentary side elevation of the typical door lock with its side removed Fig. 3, is a fragmentary View similar to Figure 2, only showing the parts in different position;

Fig. 4, is a fragmentary sectional elevation illustrating my device in use and showing the cooperative parts in disconnected relation;

F 5, is a view similar to Fig. 4, only showing the cooperative parts in connected relation Fig. 6, is a fragmentary transverse vertical section taken as indicated by the line 6-6 of Fig. 5;

Fig. 7, is a fragmentary plan view, taken as indi ated by the line 7 7 of Fig. 4: l

Fig. 8, is a sectional plan-view, taken as indicated by the line 8&8 of Fig. 5; and,

cover plate Serial No. 603,650.

of hinges 11, within a door casing, consistY ing of vertical side rails 12, and a top rail 13. The numeral 14 designates generally a typical mortise lock, set into the swinging edge 15 of the door 10; this lock having a knob 16 for withdrawing the main bolt 17; the knob 1G having a bearing 18 in a cover plate 19, secured to the surface of the door 10. The view shown in Fig. 1 is taken from the inner side of the door showing the latter swinging inwardly, and being limited in its opening' movement by my improved device.

Before proceeding to a detail description of the construction and operation of my improvement, I will first describe the construction and operation of the lock 14, with vwhich my mechanism is cooperatively connected, in order that a clearer understandin may be had of the whole arrangement.

The lock 14 is not claimed as a part of Vmy invention, except only in so far as it forms a cooperative element by means of which my device is actuated. While the type of door lock .to be hereinafter described will preferably be used; it is to be understood that my invention is not to be limited toV use in connection with this specific type of lock, but may be used in connection with other types of locks which are suitable and applicable to the purpose. VReferring first to Figs. 2 and 3, the numeral 20 designates a casing in which the moving parts of the lock are housed; this casing being mounted upon a front relatively thick plate 21, by means of which the lock casing is rigidly mounted upon the door 10 (Fig. 1), as by means of screws 22; the casing 20 extending into a recess 23, (Figs. 4 and 5) cut inwardly from the edge 24 of the door. The main bolt 17 comprises the usual bevel sided head 25, slidably mounted in an aperture 26 in the front plate 21 and adapted to engage the vusual complementary locking plate (21) set into the adjacent face of side rail 12 of the door frame; and a rearwardly extending shank 27. The shank 27 has a bearing between a pair of outwardly extending lugs 28, carried upon the side plate 29 of the'casing 20; and an expansible helical y.

and 47, of the spring 30, confined between the lugs 28 and head 25, holds the bolt normally in its outward position, as illustrated in Figs. 2 and 3. A transversely disposed bar 31 is rigidly secured to the inner end of the shank 27; which bar engages a lug' 32 upon an arm 33 J4 the latter' being pivotally of a plat-e o4, t mounted upon a pin 35 carried by theside plate 29 of casing 20. An arm 36 is pivot- Yand it is upon the outer end of this shaft 41 that the inner door knob 16 is rigidly secured. An arm 43, of the bell crank 39, has a face 44 which engages the lug 32, upon the arm 33 of plate 34; and the other arm 45 has a face 46 which engages the shoulder 38 upon the lower end of the arm 36. The seeral previouslyv described parts are held in their normal positions, as illustrated in Figs. 2 and 3, by the action of the spring 30, and faces 44 and 46 of arms 43 and 45 engaging lug 32 and shoulder 38, respectively, and also by reason of the bar 31 engaging lug 32 and a face 47 upon arm 43.

The bolt 17 is withdrawn within the plate 21, by rotation of the knob 16 in either direction, which, through t-he medium of shaft 41, rotates the bell crank 39. Rotation of the knob 16 to the right, which will throw the bell crank 39 to the right in Fig. 2, will Y effect a withdrawal of the bolt 17, within the case 20, by the engagement of faces 44 arm 43, with lug 32 and bar 31. This effects a rearward movement, (to the right in Fig. 2) of arm 33 and a raising of the arm 36 and consequently a separation of the

faces

38 and 46. The bolt 17 is in a like manner withdrawn by rotation of the knob 16 to the left; throwing the bell crank 39 to the left in Fig. 2, t-he face 46 of arm engaging the shoulder 38 and moving the arm 36 upwardly; and, by means of its pivotal connection on the pin 37 rotating the plate 34 tothrow the arm 33 to the right, which carries the bolt with it by the lug 32 engaging the bar 31.

In the present type of lock the door knob onthe outside of the door (not shown) operates independently of the inner door knob 16. The outer door knob is mounted upon a shaft 48, which has no connection with the shaft 41, and rotates independently thereof; a cam 49 being mounted upon the shaft 48 whichis adapted to engage and raise a block 50. The block 5() is mounted vertically slidable between a wall 51, of the case 20, and

a boss 52 formed on the rear plate 29. The block is limited in its downward movement by its bottom face 53, engaging a shoulder 54, on the case 20, and an extension 55, engaging the top edge of the wall 51. The center of the block is recessed, as at 56, to admit of its being' raised and its upper extremities extended on either side of the hub 40. The top face of the extension 55 is adapted to engage a face 57, on the bottom of the arm 36, below the shoulder 38, to withdraw the bolt 17 through the medium of arm 36, plate 34, arm 33, and lug 32, engaging bar 31, when the block 50 is raised by the cam 49, through rotation of the shaft 48 by the outer door knob. The action of spring 30, through the various connecting media operates to hold the block 5() down upon and in cont-act with its seat as above described.

A latch (known as a night latch) is thrown upon the lock 14 to prevent the bolt 17 being' withdrawn by turning the knob from the outside, yetnot interfering with its being drawn by rotation of the knob 16 from the inside, by means of a pair of manually

operable push pins

58 and 59 operatively connected by means of a lever 60. Each of the

pins

58 and 59 have reduced ends 61 slidingly supported in bearing apertures 62 in front plate 21. The outer ends of the apertures 62 are reamed out to form enlarged depressions to admit of the finger being' inserted therein when pushing the pins inwardly. The reduced ends 61 form shoulders 63 which abut against the inner face of plate 21, to limit the outward movement of the

pins

58 and 59. The inner end of the pin 58 is pivotally connected to the upper end of the arm by means of pivot pin 64; while the` lower end of the arm 60 is pivotally connected to the pin 59 by means of a pin 65, carried by the latter, sliding-ly engaging in a slot 66 in the former. The arm 60 is pivotally mounted on the plate 29 by means of a pin 60a.

The inner end 67, of the pin 59, is slidingly supported between bearing lugs 68, formed upon the inner face of the case plate 29. This inner end 67 of the pin 59 is also adapted, when the pin is moved to the right in Fig. 2, to ride over an extension 69, upon the block 50, to hold the latter against upward movement by rotation of cam 49. In this connection it might also be mentioned that the lugs 68 also hold the pin 59 against upward movement, so that when it is in proper position it will rigidly hold the block 50 against similar movement. Thus when the

pins

58 and 59 are in the position shown in Fig. 2 the bolt 17 may be withdrawn by rotation of either of the inner or outer knobs upon the

shafts

41 and 48, respectively; but when they are moved to the relative posiloo tions illustrated in Fig. 8, with the end 67 overriding the extension 69 the bolt may bc withdrawn only by rotation of the inner knob 16, the outer knob being held against movement to raise the block 50.

The

pins

58 and 59 are yicldingly held against movement by means of a leaf spring 59a engaging a V shaped extension 59b on the bottom edge of the pin 59.

Proceeding now to the detailed description of my improvement, an arm 70 is rigidly mounted upon the inner knob shaft 41, and is so positioned thereon that when the bol is in the position illustrated in Figure 2, that is, its normal latching position, the arm 70 will extend in the position illustrated in dotted lines in Figs. 4 and 5. A pin 71 in the outer end of the arm 70 engages in an arcuate longitudinal slot 72 in the lower end of a bar 73; the latter being separably and adjustably connected at its upper end to a rod 74 extending downwardly from the lower end of a bolt 75. For convenience of description I will hereinafter refer to the bolt 17 as the main lock bolt and. the bolt 75 as the secondary bolt. A pin 76 is carried by the bar 73 which ext-ends through a vertically disposed slot 77 in the case plate 29; which pin is adapted to engage in a notch 78 in the lower edge of the pin 58, when the latter and the bar 73 are moved to proper positions, the object of which will be hereinafter explained.

The upper end of the bar 7 3 is adjustably and removably connected to the lower end of the rod 74, by bending the former over, as at 79, and extending the rod 74 through an aperture in this bent over portion, and then inserting pins 80 through perforations 81 in the rod 74, on either' side of the portion 79.

The bar 73, and rod 74, extend through a channel 82 cut in the edge 24 of the door 10, and extending upwardly from the recess 23 to the top edge 83; a guide casing 84 con# taining the secondary bolt 75, being set into this channel, so that its top edge will be flush with the top edge 83 of the door.

The guide casing 84 may be secured in the channel 82 in any suitable manner. Its front face 85 preferably lies flush with the edge 24 of the door 10; a plate 86 being provided to enclose the front open side of the channel 82. The plate 86 may be secured in place by having an off-set upper end 87 extending to a transverse slot 88 in the bottom 89 of the guide casing 84; the opposite end of this plate beine' also off-set, as at 90, to extend behind and be retained in place by the front plate 21 of the lock 14, as shown in Figs. 4 and 5.

The secondary bolt 75 preferably has a square body portion 91, which forms a close sliding fit in the guide casing 84, and of such length as to have adequate bearing surface. The rod 74 may be attached to the body portion 91 in any suitable manner, as, for instance, by screw threaded engagement. The guide casing 84 is slightly larger than the body portion 91 on one side, to form a space 92 for the introduction of a leaf spring 93; the latter being held against longitudinal movement by engagement with the bottom 89 and top 85% rlhe spring 93 has a transversely disposed outwardly extending rib 94 adapted to engage in a complementary notch 95 in the bodyportion 91, to yieldingl y retain the latter in its uppermost position.

The guide casing 84 has an aperture 96 in its top end through which the upper end of the secondary bolt 75 extends when moved from the position shown in Fig. 4 to that shown in Fig. 5. The upper end of the bolt 75 is reduced to form a neel; 97, preferably cylindrical, on the upper end of which is a transversely disposed T-head 98, of substantially the same length as the corresponding dimension of the body portion 91.

An arm 99 is pivotally mounted at one end, by means of a pivot piny 100, in a bearing frame 101, clearly illustrated in Figs. 1, 4, 5, and 8. The frame 101 comprises a top plate 102, by means of which it is secured in a recess 103 cut in the bottom face of the top rail 13 of the door frame, and a downwardly extending back portion 104, which acts as a stop for the arm 99. A bottoni plate 105, preferably formed integral with the top plate 102 by means of an end portion 106, extends inwardly from one end and is spaced from the plate 102 to form an intel'- stice 107, which constitutes a bearing for the pivotal end of the arm 99, as shown in n 4 and 5. This bearing end of the frame 101 is set into a recess 108, cut in the side rail 12 of the door frame; and is so positioned that the inner end 109 of the plate 105 will be flush with the inner face of the rail 12, and the bottom face 110 of the arm 99, will, when in its normal position within the frame, illustrated in solid lines Fig. 8lie flush with the bottom face of the top door frame rail 13. The arm 99 is adapted to swing outwardly from the frame 101, upon its pivot, as illustrated in Fig. 1 and in dotted lines in Fig. 8.

The arm 99 has a longitudinal slot 111; so positioned that when the arm is in its normal closed position, within the frame 101, as shown in F ig. 8, and the door 10 is closed, this slot will lie directly over the T-head 98 and necl- 97, of the secondary bolt 75; the head 98 being so mounted as to extend in direction longitudinal of door 10 and of the slot 111 when the door 1.0 is closed, as shown in Figs. 4 and 5. The slot 111 may be of any length, depending upon the distance it is desired to open the door, and is of a width slightly greater than the diameter of the neck 97 on the secondary iso the top edge of the bolt 75; the bottom face of the T-head 98 being spaced from the top tace 112 ot the body portion 91, a distance slightly greater than the thickness of the arm 99; so that when the tace 112 engages the bottom tace of the arm 99, the bottom tace oi' the E`head will be tree to swing over its top tace when the door 10 is moved to the position as shown in Fig. 1, and in dotted lines in Fig. 8.

The mechanism is shown in its normal inoperative position in Figa, and in its operative position in Fig. 5 g being yieldingly held in the last mentioned position by spring 93. The slot 72, in the lower' end of the bar 73, is of such length that after the bar has been moved either upwardly or downwardly, by the arm 70, through rotation oi the door knob 16, the arm 7 0 may be tree to return to its normal central position, illustrated in dotted lines in Figs. l and 5 which is the position it assumes when the lock bolt 17 also in its normal position, as illustrated in Figs. 2 and 3.

In operation the arm 99 will normally lie in its position in the frame 101, as illustrated in solid lines in Fig. 8, and as shown in section in Figs. et and 5, and the secondary bolt 75 and its actuating` mechanism will be in the position illustrated in Fig. 4:. Bv rotating 'the inner door knob 16, and its shaift 4:1, to the right in Figs. 1 and el, the lock bolt 17 may be withdrawn to disengage it :trom its complementary latching` plate to open the door, without moving the bar 73; as in this operation the arm will move 'from the position shown in dotted lines in Fig. 4 to that shown in solid lines, the pin 71 moving` in the slot 72, without effecting movement of the bar 7 3. Assuming the parts to be still in their normal positions, as illustrated in Fig. 4f, rotation of the knob 16 to the left in Figs. 1 and 5, to withdraw the bolt 17 from its complementary locking plate, will move the arm 70 from the position shown in dotted lines in Fig. 5 to that shown in solid lines, thereby causing the pin 71 to engage the top of the slot 72, raising the bolt through the medium of bar 73 and rod 75, from the position shown in Fig. i to that shown in Fig. 5. rIhis will raise the bolt 7 5, causing` the l"head 98 to be extended through the slot 111, as illustrated in Figs. 5 and 6, so thatwhen the door 10 is open the neck 97 will carry the arm 99 with it, swinging it about its pivot 100 to the position illustrated in Fig. 1 and in dotted lines in Fig. 8. The F-head 98 is always extending parallel with the plane of the door 10 and when the door is opened it will swing to a position transversely of the slot 111, so vthat the two cannot be again disconnected until the door is closed. The bolt 75 may be disconnected from the arm 99 merely by closing the door 10, which returns the arm 99 to its'normal position, and turning the knob 16 to the right, in Figs. 1 to 5, which will move the parts from the position shown in Fig. 5 to the position shown in Fig. 1i.

The front tace of the arm 99 has a beveled notch 113 cut in it, and the head 98 and the neck 97 are bevelled on their rear sides, as at 11e, so that if the parts are in the position shown in Fig. 5, when the door 10 is open they will be moved to the position shown in Fig. et, when the door is closed, by reason of the surface 11.4 engaging the surface 113..

ln order that an unauthorized entrance may not be gained from the outside I provide the notch 78 in the pin 58, so that when these bars are moved to the position shown in F 3 and the bolt 75 raised to the posi- 'tion shown in Fig. 5, to hold the door open as shown in Fig. 1, the pin 76 upon bar 73 will engage in the notch 78, thereby preventing the shitting of either ot the

pins

58 or 59 to remove the end 67 from its position over the lug extension 69, to permit the knob to be turned to open the door from the outside.` As the bolt 75 cannot be disengaged trom the arm 99 while the door 19 is open, this will prevent anyone 'trom reaching in zhrough the open door and actuating either et the

pins

58 or 59 to permit the door toy be opened troni the outside after it has been closed to withdraw the bolt 75 'from the arm 99. ln the type of lock hereinbetore described, wherein the inner and outer door lne-bs operate entirely independent of each other, thel bolt 75 could not be withdrawn by rotation et the outer knob on shaft 48, but as this type of lock is also made with the inner and outer knob shafts 41 and Li8 operating in conjunction with each other to withdraw the bolt 17, the pin 76 and notch 78 will be effective to thus prevent unauthorized opening of the door.

l,While I have herein shown and described the prefer 'ed specitic embodiment ot my invention, I nevertheless reserve the right to make such changes or moditications in structure as will properly come within the scope o't' the appended claims.

Having described my invention, l claim:

1. The combination with a doei.' having a main bolt and means to actuate it, and a door casing, of a member carried by the door and a member carried by the casing, said members being adapted to interengage only when the door is closed to limit its opening movement, means in connection with said members to prevent their disengagement when the door is open, and means operatively connecting the bolt actuating means with one of said members to selectively etlect their interengagement or disengagement.

2. The combination witha door having a main bolt, means to actuate said bolt, and a door casing, of an arm carried by the door llO casing, a secondary-bolt carried by the door adapted to interengage with said arm to limit the opening of the door; said secondary bolt and arm being adapted to interengage only when the door is closed; and means operatively connecting the main bolt actuating means with the secondary bolt to selectively effect the interengagement of said secondary bolt and arm.

3. The combination with a door having a main bolt, means to actuate said bolt, and a door casing, of an arm carried by the door casing, a secondary bolt carried by the door adapted to interengage with said arm to limit the opening of the door; said secondary bolt and arm being adaptedto interengage only when the door is closed and having means to prevent their disengagement when the door is open; and means operatively connecting' the main bolt actuating means with the secondary bolt to selectively effect the interengagement of said secondary bolt and arm.

4. The combination with a door having a main bolt means operable in opposite directions to withdraw said bolt, and a door casing, of a member carried by the door casing, a member carried by the door, said members being adapted to interengage to limit the opening of the door; and means operatively connecting the main bolt actuating means and one of said members to positively effect their interengagement and disengagement by the bolt withdrawing means; said last mentioned means being arranged to permit selective interengagement or disengagement of said member by moving the main bolt withdrawing means in one direction or the other.

5. The combination with a door having a main bolt, means operable in opposite directions to withdraw said bolt, and a door casing, of an arm carried by the door casing, a secondary bolt carried by the door, said secondary bolt and arm being adapted to interengage to limit the opening of the door; andmeans operatively connecting the main bolt actuating means and said secondary bolt to positively effect its interengagement with said arm; said last mentioned means being arranged to permit selective interengagement or disengagement of said secondary bolt and arm by moving the main bolt withdrawing means in the proper direction.

6. The combination with a door having' a main bolt, means operable in opposite directions to withdraw said bolt, and a door casing, of an arm carried by the door casing, a secondary bolt carried by the door; said secondary bolt and arm being adapted to interengage to limit the opening of the door and having means to prevent their disengagement when the door is open; and means operatively connecting the main bolt actuating means and said secondary bolt to effect its interengagement with said arm; said last mentioned means being arranged to permit selective interengagenient or disengagement of said secondary bolt and arm by moving the main bolt withdrawing means in the proper direction.

7. The combination with a door having a main bolt, means operable in opposite directions to withdraw said bolt, and a door casing, of an arm carried by the door casing, a secondary bolt carried by the door, said secondary bolt and arm being adapted to intergage only when the door is closed to limit the opening of the door and having means to prevent their disengagement when the door is open; and means operatively connecting the main bolt actuating means and said secondary bolt to positively effect its interengagement with said arm; said last mentioned means being arranged to permit selective interengagement or disengagement of said secondary bolt and arm by moving the main bolt withdrawing means in the proper direction.

8. rIhe combination with a door having a main bolt, means operable in opposite directions to withdraw said bolt, and a door casing, of an arm carried by the door casing, a secondary bolt carried by the door, said secondary bolt and arm being adapted to interengage to limit the opening of the door; and means operatively connecting the main bolt actuating means and said secondary bolt to effect its interengagement with said arm; said last mentioned means being arranged to permit selective interengagement or disengagement of said secondary bolt and arm by moving the main bolt withdrawing means Y in the proper direction and to withdraw the main bolt without actuating bolt.

9. The combination with a door and its casing of a main bolt on the door; inner and outer knobs on the door rotatable to withdraw said bolt; latching means in connection with said main bolt and knobs to selectively prevent withdrawal of the bolt by rotation of the outer knob; an arm pivotally mounted on the casing; a secondary bolt carried by the door adapted to engage said arm to limit the opening of the door; means operatively connecting the inner knob with said secondary bolt to effect its engagement with and disengagement from said arm; and means to prevent operation of the latching means to permit rotation of the outer knob to withdraw the main bolt while the secondary bolt is in engagement with the arm.

lO. The combination with a door and its casing of a main bolt on the door; inner and outer knobs on the door rotatable to withdraw said bolt; latching means in connection with said main bolt and knobs to selectively prevent withdrawal of the bolt by rotation of the outer knob; an arm pivotally mounted said secondary on' the casing; a secondary bolt carried by the door adapted to engage said arm, only When the door is closed, to limit the opening of the door, and having means to prevent its disengagement therefrom When the door is open; means operatively connecting the inner knob With said secondary bolt to eiect its engagement with and disengagement from said arm; and means in connection With said connecting means to prevent operation of the latching' means to permit rotation of the outer knob to Withdraw the main bolt while the secondary bolt is in engagement With the arm.

11. The combination with a door and its casing of a main bolt on the door; inner. vand outerknobs on the door rotatable to Withdraw said bolt, the inner knob being operable to Withdraw the bolt by rotation in opposite directions; latching means in connection with said main bolt and knobs to selectively prevent Withdrawal of the main bolt by rotation of the outer knob, said latching means being positioned to be inaccessible for operation When the door is closed; an arm igvaaoes:

pivotally mounted on thecasing; asecondary bolt carried by the door adopted to engage said arm, only When,tlie door is closed, to limit the opening of the door, and having means to prevent its disengagement therefrom When the door is open; means 0peratively connecting the inner knob 'With said secondary bolt to effect its engagement With and disengagement from said arm; means in connection with said connecting means to prevent operation of the latching means to permit Withdrawal of the main bolt by rotation of the outer knob While the secondary bolt is in engagement With said arm; the said connecting means being arranged to permit selective engagement or disengagement of said secondary bolt with said arm simultaneously With the Withdrawal of the main bolt by rotation of the inner knob in the proper direction.

ln Witness that I claim the foregoing I have hereunto subscribed my name this 2nd day of November, 1922.V

FREDRICK M. NELSON