US1663572A - Notch bolt latch - Google Patents

Description

March 27, 192& 1,663,572

T. F. STUART ET AL NOTCH BOLT LATCH Filed Nov, 12. 1925 2 Sheets-Sheet 1 Q g '22 it 2.2 18 7V .4 0

1 16) Z YiO/QJ March 27, 192& 1,663,572

T. F. STUART ET AL uowcn sour LATCH Filed Nov 12. 1925 2 Sheets-Sheet 2 1/ 19/87 Q/.7f6or-e.

Patented Mar. 27, 1928.

mom E.- srmar ANDHE BY A. on. cams. m amscanmon a NQTQH. 3. 5 LATQE:

43.9131ication filed November 12 1925. Serial No. 68,564.

Our invention relates generally to door latches and more particularly to that type of; latch known as a notchbolt latch in that it includes a dead or looking bolt and the en-. tire latch assembly occupies a notch that is cut in the door instead of a mortise.

The. principal objects ofour invention are to generally improve upon and simplify the construction of the existing forms of generally used door latches and particularly those used upon interior doors;to provide a latch wherein the latching bolt and dead or locking bolts'are both under control; of the door knob, therebyd'oing away with thenecessity of a. key or turn button for actuating the dead or looking bolt; to; provide a latch wherein the latching bolt is reversible so that its bevelled face maybe turned toward either side of the door thus making the one latch applicable for all doors regardless of the manner in which they are hinged orthe direction in which they swing; to provide a latch having adjustable front or face plates.

thereby enabling one size of latch to be applied to. doors of differentthicknesses; further, to provide a safety trip or latching arrangement which when the door is open prevents the dead or looking bolt frombei-ng projected beyond the edge of the door, in which event the door casing or jainb would bemarred when an attempt is. made to close the door; and "further, to provide a latch that will permit of itsbeing assembled as a complete unit and consequently enabling the knobs to act more freely than in latches that are installed in mortises in the edge of; the door and which must be centeredfrom the sides for the. accommodation of the notches. With the foregoing and other objects in view, ourinvention consistsin certain novel features of construction and arrangement of parts that will hereinafter be more fully described and claimedand illustrated in the accompanying drawings, in which Fig. 1 is an elevational View of the edge of a door and showing a latch of our improved construction applied thereto. I Fig. 2 isLa vertical section taken approximately on the line 2-2 of Fig. 1.

Fig. 3 is an elevational :viewo f the latch with the side plate that serves as a cover for the latch housing removed.

Fig. 4: is-a vertical cross section taken on the line.4t of Fig. 3.

s Fig. 5is an enlarged detail section taken approximately on the line 5 5 of Fig. 1.

Fig. 6 is a verticalsection taken approximately on the line 6 -65 of Fig. 4. i

Fig. 7 is a'perspective view of a member that is carried by one of the knob spindles andwh fieh is effective actuating'the 1atchingbolt and the lockingbolt. b 1Ft ig. 8 18- a perspective view of the locking 0 I Fig. 9 is a perspective view of a dog or detent that is associated with the locking bolt and whichis actuatedto permit said bolt to be shiftedinto and; out ot l'ocking position; i

Fig. 10 is a perspective view of 'the memgefith at is utilized for actuating the 1 latching o n Fig.- 11 isperspective- VlQW of the latchingbolt andparts associated therewith.

Fig. '12 is; a horizontalsectioir taken approximately on the line 12-12 ofiF-igl 3. r Fig.- 13 is a. horizontal section taken on the line 1313 of 3. The housing of our improved latch is a substantially rectangular box-like structure and comprisesa sideplate 10, a rear end plate 1 1, a. frontor'facepl'ate12, a top plate 13, and a bottom platel l, all of which plates are areferably formed integral in orderto provide a strong and substantial structure, and secured to the edges of end plate 11 and top and bottom plates 13- and 14 by' means of screws 16 is a readily detachable side plate 17. i

This housing is adapted to occupy a substantiallyrectangularnotch N that is cut in the edge portion of a doorD-and the edge faceof'the door immediately above and below notch N' is provided with shallowrecesses R for the reception oi the end plate 12 and the extensionface plate members 18 that are adjustably arranged on the upper and lower edgesof said face plate. 7

Thesefaoe plate members 18*are slightly narrowerin width than the housing of the lock and the ends that are connected to the upper and lower edgesofplate N: are provided with dove-tailed"ribs 19 that occupy corresponding slots20 that are formed in the upper and lower edges of plate 12. As a result ofthisarrangemenuthe extension or auxiliary face plate members. 18 may be adjusted on theupper'and loweredges of plate '12 so as to beproperly centered on doors of different thicknesses. I Auxiliary plates-18 are'provided with apertures; 21 for the-receptionofscrews that secure the latch to the door.

Associated with the latch housing and arranged against the outer faces of plates 10 and 17 are face or finish plates such as 22, the edges of which extend beyond the corresponding edges of the housing and provide a finish between said latch housing and the door to which it is applied. One of these face plates is mounted for longitudinal adjustment upon the housing by means of inwardly presented lips 23 that overlie flanges 24 formed on the corresponding edges of the housing and the other face or finish plate is secured to the housing by means of a screw 25 that enters a threaded stud 26 and which latter is formed integral with and projects inwardly from side plate 10.

The reversible latching bolt of our improved latch comprises a head or'short bolt body 27 having a bevelled face 28 and said body being arranged to slide through a rectangular aperture 29 that is formed in end plate 12. Formed integral with and pro jecting inwardly from body 27 is a stem 30 to the inner end of which is applied a head or disk 31. This stem is arranged to slide freely through a sleeve 32 and the latter being arranged to slide in spaced bearings 33 that are formed integral with and project inwardly from side plate 10 of the housing.

The outer or forward end of sleeve 32 carries a disk or flange 34, and arranged on said sleeve between this flange and a washer 35 that bears against the inner one of the bearings 33 is an expansion coil spring 36.

Arranged on the projecting rear portion of stem 31 between the head 31 and the inner end of sleeve 32 is a compressionspring 37.

Depending from the inner end of sleeve 32 is a short arm 38 to the lower end of which is connected the inner end of a horizontally disposed arm 39, to the opposite end of which latter is connected a block and the latter being provided on its front face with a lug 41. Arm 39 and block 40 are arranged for sliding movement on the bottom plate 14 of the housing.

Associated with the latch are two knobs K and K which knobs are mounted in the customary manner upon spindles S which latter pass through suitably formed apertures in theface or finishing plates 22 and the plates 10 and 17.

As will be hereinafter more fully described, knob K is capable of manipulating the latching bolt 27 and also the looking or dead bolt, whereas knob K controls or is arranged to operate only the latching bolt 27. Therefore in applying the latch to the door of a particular room screen porch, or private ofiice, the latch is applied so that the knob K is on the inside ofthe door so that the looking or dead bolt may be shifted into locking position by a person within the room having a door to which the lock is applied.

The inner end of spindle S upon which knob K is mounted is made non-circular in cross section and it is mounted in a short sleeve 42 the outer end thereof having bearing in plate 17 and the inner end being mounted to rotate freely in the inner end of a short sleeve 43 that is carried by the inner endof a spindle S that carries the knob K Formed integral with and projecting radially outward from sleeve 42'is a plate 44 having at its outer end shoulders 45 and 46 and projecting rearwardly, from the outer portion of this plate 44 is a finger 47 that terminates adjacent to plate 10.

Pivotally mounted on a pin or stud 48 that is arranged in the corner ofv the cha1n ber within the latch housing that is formed between plates 11 and 13 is a bell crank member 49 and bearing against the underside of the horizontal arm 50 thereof is the free end of a flat spring 51, the outer end of whichis secured to :1 lug or bracket 52 that depends from top plate 13. The depending arm of bell crank me1nber 49 is provided on its inner face just below arm 50 with a curved bearing surface 53 that is adapted to be engaged by the upper edge of finger 47 when sleeve 42 is rotated toward the right hand and the lower end of the depending arm of said bell cranlr is provided with a head 54 that bears against lug 41 on block 40.

Thus knob K through its spindle and sleeve 42 when rotated toward the right hand swings bell crank member 49 on its fulcrum and the bearing of lug 54 against lug 41 moves the latching bolts 27 and parts associated therewith inwardly so as to retract said latching bolt and permit the door to which the latch is applied to be opened.

I In order that knob K which is on the outside of the door may retract the latching bolt, sleeve 43 that is carried by the inner portion of stem S that carries knob K is provided with a depending linger 55, the lower end of which occupies a position against the inner face of block 40. Connected to the lower end of this depending finger is one end of a retractile spring 56, the opposite end of which is connected to a pin 57- that projects inwardly from plate 10. Finger is limited in its swinging movement away from block'4O by a stud 58 that projects inwardly from plate 10.

As a result of the structure just described when knob K is rotated toward the right hand finger 55bears against block 40 to move the same and associated parts including the latching bolt inwardly thereby retracting said latching bolt and permitting the door to which the latch is applied to be opened.

The dead or locking belt of our improved latch and which is controlled only by knob K comprises a short bolt body 59 that is adapted to be projected through an opening 60 in plate 12 just above the latching bolt opening 29 and formed integral with or fixed to said bolt body and projecting inwardly within the latch housing just below top plate 13 is a bar 61 provided in its lower portion with a longitudinally disposed slot 62 through which projects a horizontally disposed lug 63. and the. latter being arranged on the lowor end of a short arm 64 that depends from topv plate 13.

Formed in the underside of the inner portion of bar 61 is a notch 65 and formed integral with and projecting forwardly from the lower portion of bar 61 below and to the sides of said notch 65 are lugs 66, the under faces of whichare curved or inclined as des ignated by 67.

Associated with bar 61 that carries locking bolt 59 is a latching member 68 having on one end a horizontally disposed pin 69 that isjournaledin an aperture 70 formed in bar 61. Carried by the end .of member 68 from which pin 69 projects is a spring 71, the free end of which bears against the underside of :1. lug 7 2 that projects forwardly from bar 61. This spring 71 exerts pressure to force the free end of member 68 downwardly onto the lugs 66. That portion of member 68 that overlies lugs 66 is provided on its front edge with a depending flange 7 8, the lower curved edge. of which extends lengthwise across the space between the curved bearing surfaces 67.

Formed in the lower edge of the central portion of member 68 are notches 74 and 7 5 that are adapted to receive lug 63 when the locking bolt is in its projected and retracted positions.

Depending flange 7 3 is in positionso that its lower curvededgeis adapted to be engaged by shoulder 45 on plate 44 carried by sleeve 42 and the curved bearing faces 67 on lugs 66 are arranged so as to be engaged by bearing shoulder 46 when sleeve 42 is rotated.

The automatically acting means for preventing the locking bolt from being projected when the door is open includes a small bolt' like member 76 having on its outer portion oppositely disposed bevelled faces77 and which member is arranged to move freely through a rectangular opening 76 that is formed. in plate 12 below the latch bolt opening 29.

that is arranged for sliding movement just beneath top plate 13. This latching bar is supported by a pin 86 and its free endiis adapted to. occupy a position, when the door to which the latch is applied is open and member 7 6 is projected, beneath a hook 87 that is formed on the upper end of a bell crankmember 88 and which latter is fulcrumed at 89 to plate 10. p

The lower portion of this bell crank member is formed: into a curved arm 90, the free end of which is adapted to be engaged by the rear end of finger 47 that projects rearwardly from plate 44 on sleeve 42.

The rearward movement of hell crank 88 is limited by a pin or stud 9i.

The operation of our improved latch is as follows:

lVl1en' the door to which our improved latch is applied is open spring 81 that is associated with stem 78 forces member 76 outwardly to its limit of movement from the latch housing, as illustrated in Figs. 3 and 1-8, and when the member 76 is thus positioned, lever 83 holds latch member 85 at its limit of movement toward the right hand and with the free end of. said member 85 engaged beneath hook 87 of hell crank member 88.

.Vith the parts so positioned it is impossible for bell crank member 88-to swing upon its fulcrum and consequently the engagement of arm 90' against the finger 47 carried by sleeve 42 prevents thev latter from being rotated toward the left hand to shift the locking bolt outwardly from the latch housing. Consequently as long as the door to which the latch is applied is open, it is impossible to project locking bolt 59 and parts associated therewith, andthus the door can always be readily closed and which result would not be possible if the locking bolt were accidently projected while the door is open.

When the door is closed the bevelled outer end of member 76 strikes against a blank the right hand and, as a result, bearing shoulder 46 on plate 44 that is carried by sleeve 42 will engage curved bearing case 53 on dependingarm 49., thereby swinging said arm upon its fulcrum or' pivot and causing head 54 to press against lug 41 and move block 40 and parts associated therewith including latch bolt 27 inwardly or toward the. right hand. Thus the pro Ijecting portion ofthe latch bolt is withdrawn from its recess or aperture in the striking plate on the door jamb and the. door may be. readily opened. Asisoon as knob, K

is disengaged the power stored in compression spring 36 and spring 51 will act to return the parts to their normal positions and with the latching bolt projecting from the locking housing.

Inasmuch as sleeve 41 rotates independently of sleeve 48, the actuation of knob K will in no wise aiiect knob K and parts associated therewith, and vice versa.

To retract latching bolt 27 and open the door from the outside, knob K is manually engaged and rotated a short distance toward the right hand and as sleeve 13 that is carried by the spindle of said knob K is rotated, depending arm 51 will be swung toward the right hand, thereby engaging and bearing against block so as to move the same and parts associated therewith,'and as a result, latching bolt 27 will be retracted or drawn into the latch housing so that the door may be opened.

As knob K is released, retractile spring 56 will return arm 55 to its'normal position and the latching bolt and associated parts are returned to their normal positions under the influence of spring 36.

As previously stated, the latch is applied to the door so that the knob K is on the inside of the room, for instance, a screened porch, a bath room, or a private otiice, and when a person within the room desires to positively lock the door against being opened from the exterior, knob K is engaged and rotated a short distance toward the left hand. Inasmuch as hook 87 is free, member 88 will be swung upon its pivot 89 by the pressure of linger 41-7 against arm 90 and bearing shoulder on plate 4 1 will engage the curved lower edge of flange 73 and thereby swing the free end of member 68 upwardly so that lug 63 is free from the notch 75 in which it has been engaged. It will be understood that lug 63' occupies notch 75 while the locking bolt is in retracted position and thus said locking bolt is positively held in such locking position until member 68 is moved upward to free lug 63.

Following the upward swinging movement of member 68 bearing shoulder 46 engages the left hand one of the bearing faces 67 and as the turning movement of the knob continues the locking bolt and member 68 carried thereby will be upwardly moved toward the left hand so as to project locking bolt 59 and the same will enter the aperture .or recess in the'striking plate on the door jamb.

At the end of this bolt projecting operation, shoulder will pass beyond the lowermost portion of flange 73, thereby permitting the free end of member 68 to move downward under the influence of spring 71 so that lug 63 will occupy notch 74 with the result that the locking bolt and bolt latching member 68 will be positively locked when moved outward into locking position. \Vith the door thus locked it will be impossible to unlock the same from the outside by reason of the fact that there is no mechanism associated with the outside knob and its sleeve 43 to actuate or retract the locking bolt.

To retract the locking bolt it is only necessary to reversely rotate knob K or rotate the same toward the right hand and as a result, latch member 68 will be first lifted and then bearing shoulder 46 will engage against the curved bearing surface on the right hand lug 66 and continued movement will draw the locking bolt and parts carried thereby toward the right hand so as to draw the projecting portion of said bolt into the lock housing.

The adjustment of the latch housing upon the face plate 22 that is applied to the outer face of the door enables said latch housing to be readily shifted a short distance longitudinally in either direction and thereby centered or positioned so as to receive the stems S that carry the knobs K and K when the latch is applied. to the door, and by making the auxiliary plates 18 adjustable upon plate 12, said auxiliary plates may be readily centered upon the door to which the latch is applied.

A. particularly valuable and advantageous feature of our improved latch is the reversible latching bolt 27, for by the provision of such a bolt the latch may be applied to doors that swing in either direction. I

To reverse the latching bolt it is only necessary to engage the projecting portion of said bolt and pull the same outwardly against the resistance of spring 37 and then turn the bolt half way round and permit the same to re-enter the aperture 29. This action reverses the position of the bevelled face 28 on said latching bolt and consequently enables the latch to be universally used on right hand or left hand hung doors or doors that swing in different directions.

Thus it will be seen that we have provided a notch bolt latch that is relatively simple in construction, capable of being readily installed and which is very effective in performing its intended functions.

It will be understood that minor changes in the size, form and construction of the various parts of our improved latch may be made and substituted for those herein shown and described without departing from the spirit of our invention, the scope of which is set forth in the appended claims.

We claim as our invention:

1. In a door latch, a housing, a latching bolt arranged for operation therein, a loclc ing bolt arranged for operation within said housing, a pair of independently operable knobs associated with said latch, means associated with each knob for retracting said latching bolt and means associated with one knob for projecting and retracting the locking. bolt.

2. In a door latch, a housing, a latching bolt arranged for operation therein, a looking bolt arranged for operation within said housing, a pair of independently operable knobs associated with said latch, means associated with each knob for retracting said latching bolt, means associated with one knob for projecting and retracting the locking bolt and automatically acting means for rendering the locking boltactuating means inoperative while the door to which the latch is applied is open.

3. In a door latch, a housing, a latching bolt arranged for operation therein, a locking bolt arranged for operationwithin said housing, a pair of. independently operable knobs carrying spindles arranged for opera tion within the housing, means carried by one spindle for retracting the latching bolt, means carried by the other spindle for retracting the latching bolt and means carried by one of said spindles for projecting and retracting said locking bolt.

4. In a door latch, a housing, a latching bolt arranged for operation therein, a locking bolt arranged for operation within said housing, a pair of independently operable knobs carrying spindles arranged for opera tion Within the housing, means carried by one spindle for retracting the latching bolt, means carried by the other spindle for 'retracting the latching bolt, means carried by one of said spindles for projecting and retracting said locking bolt and means associated with said locking bolt for latching it in both retracted and projected positions.

5. In a door latch, a housing, a latching bolt arranged for operation therein, a looking bolt arranged for operation within said housing, a pair of independently operable knobs carrying spindles arranged for operation within the housing, means carried by one spindle for retracting the latching bolt, means carried by the other spindle for retracting the latching bolt, means carried byone of said spindles for projecting and retracting said locking bolt and means movable into position when the door with which the latch is associated is open for rendering the locking bolt actuating means inoperative.

6. In a door latch, a housing, a latching bolt arranged for operation therein, a locking bolt arranged for operation within said housing, a pair of independently operable knobs carrying spindles arranged for operation within the housing, means carried by one spindle for retracting the latching bolt, means carried by the other spindle for retracting the latching bolt, means carried by one of said spindles for projecting and retracting said locking bolt, means associated with said locking bolt for latching it in both retracted and projected positions and means movable into position when the door with which the latch is associated is open for rendering the. locking bolt actuating means inoperative.

' 7. In a door latch, a housing, a latching bolt arranged for operation therein, a locking bolt arranged for operation within said housing, aknob carrying spindle arranged for operation within the latch, means carried by said spindle and associated therewith for retracting said latching bolt and a portion of which last mentioned means is adapted to project and retract said locking bolt.

8. In a door latch, a housing, a locking bolt arranged for operation therein, a knob carrying spindle arranged for operation in said housing, means carried by said spindle for projecting and retracting said locking bolt and automatically acting means operable when the door to which the latch is applied is open for rendering the spindle carried locking bolt actuating means inoperative.

9. In a door latch, a housing, a locking bolt arranged for operation therein, a knob carrying spindle arranged for operation in said housing, means carried by said spindle for projecting and retracting said locking bolt, automatically acting means operable when the door to which the latch is applied is open for rendering the spindle carried locking bolt actuating means inoperative and means for positively locking the locking bolt in both projected and retracted positions.

10. In a door latch, a housing for the locking mechanism, which housing includes an end plate and auxiliary end plates adjustably arranged on the upper and lower edges of said end plate.

11. In a door latch, a housing for the loci ing mechanism and auxiliary end plates mounted .for independent transverse adjustment at one end of said housing.

In testimony whereof we afiix our signatures.

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