US1101253A

US1101253A - Screen-door latch.

Info

Publication number: US1101253A
Authority: US
Inventors: John K Champ
Original assignee: Individual
Current assignee: Individual
Priority date: 1913-10-11
Filing date: 1913-10-11
Publication date: 1914-06-23
Anticipated expiration: 1931-06-23

Description

J. K. CHAMP. SCREEN DOOR LATCH. APPLICATION IILBD own, 1913.

1,101,253. Patented Juhe 23, 1914.

4 it w WY JOHN K. CHAMP, OF PARIS, KENTUCKY.

SCREEN-DOOR LATCH.

Specification of Letters Patent.

Patented June 23, 1914.

Application filed October-11, 1913. Serial No. 794,727.

To all whom it may concern:

Be it known that I, JOHN K. CHAMP, a citizen of the United States, and a resident of Paris, county of Bourbon, and State of Kentucky, have invented a new and useful Improvement in Screen-Door Latches, of which the followin is a full, clear, and exact description, re erence being had to the accompanying drawings, forming a part of this specification.

My invention relates to a latch for screen doors, and has for its object the Provision of such a latch of simple and inexpenslve construction and one which has provision for independent looking on the inside so that it is secure from outside manipulation.

With this and other objects in view my invention consists in details of construction hereinafter particularly described and disclosed in the accompanying drawings, in which Figure 1 is a perspective of my new latch as applied to a door; Fig. 2 is a plan view of the operating parts of my new latch, the back of the casing having beenremoved; Fig. 3 is an edge view of the latch with the end of the casing removed; Fig. 4 is a horizontal section of an overlapping door and jamb, showing the attachment of my new latch.

The numeral 1 indicates the casing of my new latch; said casing is of metal preferably and is adapted to be secured to the upright of a screen door. Pivotally mounted on a stud 2 in said casing is an arm 3 which carries a laterally projecting bolt 4 adapted to enter, for the purpose of locking the door, into a recess 5. Operatively connected with said arm 3 is a stud 6 which projects through a slot 7 in the back plate 8 of the casing; by means of this stud the bolt 4 may be operated to lock or unlock the door as will be readily apparent and the slot 7 will be at all times closed by the backward extension of the arm 3 as shown. In order that the bolt may be secured in either looking or free position, the arm 3 is provided with a finger 9 which is adapted to operate during the movement of the bolt 4 over a hump 10 on a pivotally mounted arm 11; the mounting of said arm being on a stud 12 attached to the casing. The arm 11 is held in tension by means of a spring 13, which engages a notch 14 in the side of the arm opposite the hump 10, the opposite end of said spring bearing in a notch in an arm 15, which arm is pivotally mounted on a stud 16 in the casing and is maintained against the tension of spring 13 in the manner hereinafter described. Itotatably mounted in the casing is a shaft 17 which extends outwardly through the upright of the door and has attached to its free end a knob 18 by means of which the shaft maybe rotated from the outside Secured to said shaft is an arm 19 similar in all respects to arm 3, and having a bolt 20, operating stud 21 and finger 22 also similar to the like parts on arm 3. The bolt 20 is adapted to engage a notch 23 to lock the door. Pivotally mounted-in the casing is an arm 24, simllar to arm 11, which carries a hum 25 adapted to operate in conjunction with finger 22 in the manner of the operation of finger 9 and hump 10. The arm 24 is maintained under tension by means of a spring 26, which engages said arm, and also the arm 15 opposite the engagement of spring 13 therewith. The

springs

13 and 26 being thus opposed, the pivotally mounted arm 15 will be held in balance, so to speak, between them, and the

arms

11 and 24 will thus at all times be under equal tension.

The ends of the locking bolts 4 and 20 are rabbeted, as shown in Figs. 1, 3 and 4 so that the projecting ends are thinner than the bolts proper, as shown at 27. Thus when the latch casing is secured to the upright of a screen door, as shown in Fig. 4, the bolt is adapted to engage the notch 5 on the jamb, a substantial thickness of metal 28 of the plate being between the bolt and the inside of the door.

From the foregoing description the operation of my latch will be apparent. To look the door from the inside the bolt 4 is thrown into the recess 5 in the manner above indicated by means of the stud 6; to unlock, the bolt is thrown back by means of the reverse operation of the stud 6. In either position it will be maintained by the tension of arm 11. The operation of bolt 20 is effected from the outside by means of knob 18 and from the inside by stud 21. One bolt may thus be operated from the outside or inside of the door, and the other bolt from the inside only, thus effectively locking the door against outside manipulation. By this construction also an effective and equal tension is at all times maintained for the two bolts by means of the opposed bearing of

springs

13 and 26 on the pivotally mounted arm 15.

Having thus described my invention,

what I claim as new and desire to secureby Letters Patent, is:

1. A screen door latch comprising a casing, a locking bolt pivotally mounted. in said casing, a slot in the back wall of said casing, a stud on said bolt and projecting through said slot for the operation of said bolt, an extension back of said bolt at all times to close said slot, a tension arm piv otally mounted in said casing and adapted to engage said bolt to hold the same in either looking or unlocked position and a spring to maintain said arm under tension.

2. A screen door latch comprising a casing, two locking bolts pivotally mounted in said casingand adapted to engage recesses in the jamb of a door, tension arms pivotally mounted in said casing and provided with means to hold said bolts in either looking or unlocked position, means for the operation of said bolts, an arm ivotally mounted in said casing between said tension arms, vand springsbearing between said last mentioned arm and said tension arms whereby equality of tension of the latter may be automatically maintained.

In witness whereof I have hereunto set my hand this8 dayof :Ootober, 1913.

JOHN K. CHAMP. Witnesses:

GEORGE B L RZ W. M. B-YABS.

' Copies of this patent may be obtained for five cents each, by addressing-the Commissioner of Eatents Washington, D. G.