US1685998A - Double-acting door latch - Google Patents

Description

Oct. 2, 1928.

c. J. HAGSTROM DOUBLE ACTING DOOR LATCH Filed May 20, 1927 141$ I .7 M: fixg IPELi: m

Patented (let. 2, 1928.

UNlTiiE v 'p I I cam. JOHN nAesrnomor G EN] cove, NEW YORK. 1

DOUBLE-ACTING noon LATCH.

I Application filed May 20, .1927. S.eria1'No.-192,823.

This invention relatesto builders hard-.

ware and has particular reference to'catches or latches for a plurality of doors orother similar openings.

where a pair of doors are provided for passage ways from one room or space to another,

. and one of the objects of the invention is to render it imposslble for bothof such doors to be opened at the same time, or for either door to beopened while theother is open. In placessuch as hospitals, laboratories, or the :may not be opened or be open at" the same time.

With the foregoing and other objects in view the invention consists in the arrangement and combination of parts hereinafter described and claimed, and. while the invention is not restricted to the exact details of construction, disclosed or suggested: herein, still for the purpose of illustrating a practical embodiment thereofreference is had: to theaccompanying drawings 1n whlch like reference characters deslgnate the same parts,

in the several views, andin which' Figure 1 is a side elevation of; a preferred embodiment of the invention, both doors be ing shown as being held normally, locked closed.

Fig. 2 is a similar view-showing the posi tion. of the parts with one of the doors open,

and with the other locked positively from being opened until the previously open door is returned tonorma-l locked position.

. Fig. 3'is a diagram indicating a suggestion of a pair or group of doorssuch as arereferred to herein.

mechanism.

It will :be understood thatthe doors maybe variously designed as to their construction and direction or mode of operation, butea ch of the doors carries a catch 10 which when the door is being closed has. wiping contact at '11 with a'catch bolt 12 slidable against the force ofa spring 13 in a direction transversev to the direction of movement of the catch-1G;

In numerous instancesv there are places end having a similar tooth connection at 28 tween the catches they are .closed.

Fig. 4 is a view of a modification of keeper The bolt 12 is provided with a14 within which; is housed the spring 13, the spring having abutment at one end against one end 1 of the slot'and at the other endagainst a fixed guide pin 15 carried by atumbler or actuator 16 pivoted at 17. A. strong leaf spring 18 is s anchored at 19 and 20 and exert'sa normal tendency to'keep the tail piece 16 of the tumbler against a sto'p or abutment 21 fixed to thecasing.

' 22 indicates amember slidable along a pair of fixed guide ways 23 carried by the casing,

, the ends of which in normal position lie'ad jacent to and slightly overlap the path of movement of the ends 16 of thetumblers 16.

The adjacent ends 16 of; the tumblers and 22? of the keeper 22 are beveled or' rounded so that either of theends 1.6 when iswung downward or away from the abutment 21-may l I cause, by wiping contact with. thekeeper, the" endwise movement of the keeper along the guides 23. The amount of overlap or eccentricity of the two ends 16 and 22 is suflicient during such movement .of one of the tumblers to cause the opposite endof the keeper22to' assume a position well beneath the end 16 of the oppositetumbler as shown at 22 in Fig. 7

2,.rendering it impossible for the opposite At 24 I show a link having one end or tooth door tobe opened untilthe keeper is restored Y i v again to its normalv position as in Fig. 1. 1

25 fitted in a notch 26 in the keeper 22. This link is pivoted at 27 adjacent toits opposite in a notch 29 of a trip bar 30 slidable parallel to. the keeper 22 in guides 31 fixedto the cars ing. The length of the bar 30 corresponds approximately to the normal space or gap be- 10. of the two doors when 1 Having thus set forth the mechanical constructionthe. mode of operation may be briefly summarized as follows: With the.

doors ,closed and held closed by thecatches as shown inFig. 1, either door may be opened by direct pull or push as, forinstance, as shown at theleft end of 2.. The, catch 10 .carriedby said door will cause, by its cooperation with the parts 11 jand12, the rock ing of the tumbler 1'6 in'a clockwise movement as above described, the end 16 thereof wiping "against the end22i of the keeper causing'the enclwise bodily projection of the keeper to the] V 'positionof Fig. 2. This movement of the:

izeepergaeting through the 15.13.111 24 causes ar no] i similar movement in the opposite direction movement of the keeper.

' is caused in this manner to lie in thepath of toswmg away from each other around hinges the catch 10 when the open door again comes shut. The movement of thekeeper 22 in the manner just described bringing its end 22 positively beneath the end 16 of the opposite tumbler, constitutes .a positive stop orbarrier preventing the opening of the second door, while the first door is open. When, however, the open door is returned to closed position, the catch 10 thereof impinging against the end of the bar 30, will cause through the rocking of the link 24,-, the return to normal position of the keeper .22, making it then possible for either door to be opened in the regular way. It will be noted, however, .that should itbe undertaken to open both doors at the same time, the ends of the 1 keeper will both bar the movement of the tail pieces 16 of the tumblers and render it impossible for either of the doors to be opened at such time. When an open door is returned to closed position, the surface 11 of its keeper 10 wi esagainst the beveled end of the bolt 12 an causes the bolt to pass outjof the way of the catch, but the spring 13 promptly returns the bolt to normal holding position as soon as thecatch 11 passes the point thereof.

The descri tion of construction and operation of the atching mechanism for either door will be understood as applicable to both because as shown herein the mechanismis symmetrical asto both doors.

Fig. 3 represents two doors A and Bzhinged 32 and each carrying a catch 10. From what has been set forth above it will be understood that any person a proaching the door A for opening it towar him may do so freely in order to enter the space C between the doors,

or pass subsequently'through the door B, provided that the door B is closed when the person opens the door A. Likewise any person.

approaching the door B for opening-it toward him may do so freely if the door A is latched, but neither door can be opened when thel'other is open.

h In the modification of Fig. 4, thetrip. bar 30J'is similar to the bar 30 above described in so far as its length, location, and actuation are concerned, but instead of having av single notch v29, it is provided with two notches 29" inaeach of which is fitted a link or strut 24 pivoted at 27, the upper endof'e'ach vof the links or struts co-operating with the tail end 7 p swinging of the tumbler when the door is being opened, means co-operating "with each 1690f the tumbler. The operation'is the same against the upper end of the strut 24* will cause the endwise movement of the bar 30,

thereby bringing the other strut into positive latching position with respect to the opposite tumbler.

I claim 1. In a device of the class set forth, the combination with two members adapted to be moved as toopen position, of catch mecha nism co-operating with said members, permitting either of the members to be moved, said catch mechanism having means actuated by.

means actuated by said actuator to lock the second member.

2. In a device of the class set forth, the combination of apair of doors adapted to be severally opened, of catch mechanism normally holding the doors closed to permit either of them to be openedindependently of the other, said catch mechanism including means to ositively lock a. door from being" opened while the other is open, said means including a plurality of actuators, a catch on each door engaging one of said actuators to .movethe same on openinga door, means operated by the actuator moved to lock the other actuator against movement, and means to return said last mentioned means to init al pos tionon closing said door.

.3. In a double acting door latch, the com-.

bination of a pair of movable tumblers, akeepor acting between the tumblers and serving. 1

normally to prevent positively the movement ,of both of them at the same time, the keeper,-

however, permitting the movement of either tumbler to the exclusion of the other and being movable at such time so as topositively prevent the movement of the other tumbler,

means for attachment to a pair of-doors for severallymoving the tumblers, and m'eans actuated by the last mentioned means for the purpose of restoring the keeper to normal position when the doors are both shut.

' '4. In, a double acting door' latch of the character set forth, the combination of a pair of tumblers pivoted for swinging movement in spaced relation to each other, a keeper bridging the space between the tumblersand preventing normally the movement of both of them atthe same time, but permitting the movement of either to the exclusion of the other, a spring actuated member carried by each tumbler, a member for attachment to a door and co-operating with the catch member of each tumbler and serving to cause the tumbler to restore'its normal position after being moved, the catch member on the tumbler and the meanscarried by the door cooperating to restore the catch means to normal position when the door is being shut, and means actuated by the door While closingtorestore the keeper to normal'position.

5. In double acting latch means for a pair of doors, the combination of a pair of tumblers pivoted for swinging movement severally in opposite directions and spaced from each other, a. slidable keeper bridging the space between the tumblers, said keeper being'movable freely endWise When either door is openedand the tumbler'pertaining thereto is swung around it spivot, a trip bar slidable parallel to the keeper,a pair of catch v members for connection to the pair of doors j and between which the trip bar normally I spans the space, andmeans to cause slidable movement of the keeper andtrip bar severally V each from the other, substantially as setforth'.

In testimony whereof I aflix my signature.

CARL JOHN HAGSTROM.

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