US2575465A - Locking device for sliding doors - Google Patents

Description

New 20, 1951 J. w. PATTQN LOCKING DEVICE FOR SLIDING DOORS Filed Jan. 25, 1948 2 SHEETSSHEET l m2 7 V I20 mi ORNEY V INVENTOR John M. Paflbw BY Nov. 20, 1951 J. w. PATTON LOCKING DEVICE FOR SLIDING DOORS 2 SHEETS-SI-IEET 2 Filed Jan. 23, 1948 INVENTOR Jbim WPaflon ATTO EY I Patented Nov. 20, 1951 2,575,465 LOCKING DEVICE FOR SLIDING Dooits ''-John W. Patton,- Philadelphia, Pa assignor to American Car and Foundry Company, New York, N; Y., a corporation of New Jersey Application January 23, 1948, Serial No. 4,030

- 2 Claims.-

1 This invention relates to sliding door locking devices of the type in which latch mechanism normally engageable to yieldably hold the door closed is positively retained against disengageemergency.

duced to a minimum.

taken on the line 2-2 of Figure 10.

Figure l.

ing device.

. 2 I Figure' 7 is a view similar to Figure 5, but showing a slightly modified form of the invention.

Figure 8 is a view similar to Figure 6 of the ment by a slidable dogging bolt to lock the door. 5 modification shown in Figure 7.

This type of locking device is adapted for use Figure 9 is a view taken on the line 99 of generally on sliding doors, including sleeping car Figure 7. room doors. It is especially important in the Figure 10 is an end View of the door taken case of sleeping car room doors to avoid poson line I 0-40 of Figure 1 showing the locking sible injury to passengers and their clothing or 10 device applied thereto; and luggage by parts of the locking device projecta Figure 11 is a detached perspective view of ing into the doorway when open. Further, it is the slidable dogging bolt used with the modifidesirable that such devices be of simple concation shown in Figures 7, 8 and 9. struction, easy to operate and as nearly as pos- Referring now more in detail tothe drawings, sible failure proof. However, in the event of 15 the locking device is shown as applied to a door failure, quick and easy access to the-interior of A adapted to slide to closed position against a the device should bepossible in order to permit door jamb B. The door jamb is cut away as operation from outside the room in cases of indicated at I2 to receive a casting 4 having i a recess l6 formed with an inclined wall [8 and It is an object of the invention to provide a an abutment 20 Pivotally mounted on a pin 22 locking device of the type described which will within the recess 16 is a hook-shaped latch memmeet the aforementioned requirements. ber 24 formed with a shoulder 26 normally bear- Another object of the invention is the proviing against abutment 20 of the casting l4 to limit sion of such a device which is located substandownward pivotal movement of the latch so as to tially entirely within the edge outlines of the retain it in operative position shown in Figure 1. door and door frame to prevent injury to persons The latch 24 is resiliently held against moveor objects passing through the open doorway. ment from its operative position by a compres- A further'object of the invention is to provide sion spring 28 held in place between a spring a locking device of the kind described, of simseat 30 formed in the recess wall I8 and a boss ple construction and operation and in which the 30 32 provided on the latch. The latch 24 is thus possibility of failure of the parts has been repivotally mounted to swing downwardly by gravity, its movement in that direction being limited A still further object ofthe invention is the by abutment 20 and shoulder 26 acting as stop provision of such a locking device provided with means while its upward movement is limited by an easily removable cover plate affording quick the inclined wall It and top wall 33 of the reaccess to the interior of the device to permit cess l6. This arrangement assures that the latch emergency operation from outside of the door. 24 will always be retained in operative position These and other objects of the invention will even though the spring 28 should fail or be rebe apparent to those skilled in the art to which moved for any reason. The casting I4 is seit appertains from a study of the following decured by screws 34 to the door jamb, which is scription and accompanying drawings in which: grooved as Shown at 6 o e e the tongued Figure 1 is a broken sectional side view of the edge portion 38 of the sliding door A, thus formlocking device with the door in open position. ing a seal between the door and jamb. Figure 2 is a sectional plan view of the device The sliding door A is cut out as shown at 40 to receive a casting generally indicated at 42 Figure 3 is a view taken on the line 3-3 of having a side wall 44, front wall 46, short rear wall 48 and top and bottom walls 50 and 52, Figure 4 is a detached perspective view of the respectively. The casting 42 is fitted in place slidable dogging bolt forming part of the lockwith its side wall 44 on the inside or room side 50 of the door and forming the inside finish plate Figure 5 is a view similar to Figure 1, but for that part of the locking device on the door. showing the device in door locking position. Formed integral with or otherwise secured to the Figure 6 is a side elevational view showing'the front wall 46 of the casting 42 is a hoop-shaped door in open position, a portion of the door bolt 54 of the proper size and shape to cooperate 55 with and engage the pivoted latch 24 to yield'ably jamb being removed to more clearly disclose other parts of the device. 1

hold the door A in closed position. When the door A is closed against the jamb B the bolt 54 will be engaged under latch 24, the weight of the latch and pressure of spring 28 acting to hold the (1001 closed but yielding upon opening force being applied to the door.

The latch 24 and bolt 54 are locked against disengagement to hold the door in locked position by a slidable doggingbolt 55 shown detached from the device in Figure 4. The dogging bolt is formed with an elongated slot 58 through which extends a pin 60 carried by the side wall 44 of the casting 42, and a reduced end portion -62 extended through an opening 54in front wall 46 of casting 42. The dogging boltisthusslidably supported by pin 60 and iront wall 46 'of the casting, being movable between a withdrawn position and a position extending into the recess I6 of the door jamb B when the dooris closed for engagement with the flat top surface 66 of latch '24 to lock it in-engagement with the :bolt 54. Pivotally mounted-onpin-Gil is acheck plate 68 formed with an opening of such shape as to provide a depending wedge-shaped detent l engaging a similarly shaped lug I2 projecting from the clogging bolt 56 through the opening in plate 68. The detent Ill and lug I2 are resiliently retained in operative engagement by a spring 14 having one end anchored to .plate 68 and its other end portion restrained under a ledge 16 formed on the dogging bolt 56. It will be'seen that duringmovementof the dogging bolt between withdrawn and extended positions the detent it will ride on lug I2 against the'action of spring T4,'the detent III being engageable with opposite faces of the wedge-shaped lug 12 to releasably retain the dogging bolt in either .of its positions. The outer side of the casting 42 is closed by a removable cover plate 18 secured in place by screws 80 against ribs 82 and inset bearing portions 84 formed integral with the casting 42. The detent plate 68 is retained against displacement from operative position by a projection 85 formed on the plate and maintaining it in spaced relationto thecover plate 18.

The device as shown in Figures 1, 2, 3, -andr6, in which n used the type of dogging boltcshown in Figure 4, is operated from the inside or room side of the door A bya rotatably'mounted knob 8-8. The knob has a shank -90 screw'threaded into the side wall 44 of casting 42 and a square stem 92 non-rotatably engaged with a sleeve:94 journalled in cover plate 1.8. The sleeve 94 is formed with a radially-extending cylindrical portion-96 received in a curved groove 98.formed.in the-dogging bolt 55. It will thus bezseen that-the dogging bolt 56 may be moved from one position to the other byturning the knob 88.

The device as shown in Figures 7, 8 and 9 is the same as previously described except'that a different type of operating means is :used, requiring a dogging bolt as shown-in Figure .11. In this slightrnodification of the invention the dogging bolt 56 is actuatedby a slidableknob I00 having a shank I62 slidably arranged .in an elongated slot IE4 formedin side wall 44 of the casting 42. A stem H16 projectingfromtheshank extends through a hole I08 in the dogging bolt and issecuredthereto by a screw H0. The dogging bolt may thus be moved to and from door locking position by sliding of the knob Illil.

'Both types of dogging bolts as-shown in Figures 4 and 11 may be-unlocked'from outside of the door by use of a key through the key hole 'il2iormed in the coverplate 18. The key is inserted over a stud H4 secured toside wall =44 of casting 42 and turned until it engages the notch H6 formed in the dogging bolt. Further turning of the key will then withdraw the bolt from looking position.

A removable finish plate H8 is applied to the outside of the door A by screws I20 extending through the door and connected in any suit- -.able.manner :to the side wall 44 of casting 42. The side wall of the casting serves as the inside l finish plate for the locking device and since this is secured by the screws I20 to the removable iinishplate I fBthe casting or casing 42 housing the locking device is firmly held in position in the door. The :i'inish plate H8 is of course also formed with a 'key hole aligned with the key hole I12 in cover plate 18, and which is enclosed by 'the'keyhole plate I22. The sliding doorenisopened and closed from inside the room by a handle [24 and from the outside by the hand grips I26.

It will be seen that a locking device for sliding .doors has been provided which is of strong yet simple construction, easy to operate, andin which the partsare located substantially entirely within the edgeoutlines of the door and ,jamb, thus reducing to a minimum the likelihood of injury to persons or objects passing through the open doorway. The mounting of latch 24 with its downward pivotal movement limited by engagement of shoulder 26 with abutment 20 assures that the latch will be retained in operative position even though the spring 28 shouldiail. In addition, should it be necessary to quickly unlock the door from the outside, as incaseof emergency, andthe key-is .unavailableor fails to operate, the finish plate I I8 and cover plate .18 are easily removable, to permit direct manual withdrawal from looking position of the dogging bolt 56.

While the invention has been described more or less in detail,.it will be obvious to those skilled in the art that various modifications may be made, and all such modifications are contemplated as will .fall within the scope of the appended claims defining my invention.

What is .claimedis:

1. .In alocking device for sliding doors, means forming twoseparable ;casings, a rigid bolt fixed within oneof said casings, a pivotally mounted latch housed within the other :casing, said :rigid bolt and latch having cooperating surfaces so formed as to be engageable to yieldably hold the door closed and -.disengageable by opening movement of the door,:an abutment in the casing that houses the .latch "located below-the pivotal axis thereof, a shoulder on saidlatch engageable with said abutment to prevent the latch from dropping below its operative position, resilient meansseated in a wall of the casin above .the latch ,constantly urgin the latter towards operative position, a-dogging-bolt slidably mounted .in said one casing horizontally movable between a withdrawn position therein and a position where it extends into "the other of said casings when the door is closed toengage over the top of said latch, a check plate pivotally mounted on an inner wall :of said one casing and associated withthe-dogg'ing :bolt and .:having an opening to provide a depending wedge-shaped detent, a wedge-shaped lug projecting from said dogging bolt through the opening in said check plate for slidable and 'oooperable engagement with the lug tovreleasably retain the doggin ibolt in :either of its saiii positions, :said .detent riding over said lug during movement'of the dogging bolt from one position to the other to lift the check plate for selectively positioning the detent on either side of the lug, and resilient means constantly urging said detent and projecting lu into cooperative engagement.

2. A locking device for sliding doors comprising, means forming two separable casings, a rigid bolt located within one of said casings, a latch pivotally mounted in the other casing, said bolt and latch being adapted to engage upon closing movement of the door to yieldably hold the latter in closed position and to be disengaged by opening movement of said door, a dogging bolt mounted for horizontal sliding movement from a withdrawn position within said one casing to a position extending into the other casing when the door is closed to engage over said latch and lock it against movement, a check plate pivotally mounted on an inner wall of said one casin and being formed with an opening providing a depending wedge-shaped detent, said dogging bolt having a wedge-shaped lug projecting therefrom through the opening in said check plate to cooperatively engage said detent and formed with a ledge, said projecting lug sliding underneath said detent during movement of the dogging bolt from one position to the other to raise the check plate for selectively engaging said detent on opposite sides of the lug to releasably retain the doggin bolt in either of its respective positions, and a compression spring having one end anchored in said check plate and its other end engaged beneath said ledge on the dogging bolt for constantly urging said detent and lug into cooperative engagement.

JOHN W. PATTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 165,847 McClymonds July 20, 1875 913,459 Bily Feb. 23, 1909 922,675 Day May 25, 1909 1,482,788 Freysinger Feb. 5, 1924 1,596,242 Dunn Aug. 17, 1926 2,044,622 Michauka June 16, 1936 2,190,485 Rossman Feb. 13, 1940

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