US1370681A

US1370681A - Door-latch

Info

Publication number: US1370681A
Application number: US305022A
Authority: US
Inventors: Arthur E Bloxsom
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-06-18
Filing date: 1919-06-18
Publication date: 1921-03-08
Anticipated expiration: 1938-03-08

Description

A. E. BLOXISOM.

DOO R LATCH.

APPLICATION FILED JUNE I8, 19I9.

1,370,681 Patented Mar..8, 1921.

' 2 SHEETS-SHEET I.

INVENTOR. A5 5.1. oxsoM.

QLL/c g ATTORNEY.

A.'E. BLOXSOM.

DOOR LATCH.

APPLICATION FILED JUNE 18, 1919.

'1 370,681, Patented Mar. 8, 1921.

2 SHEETS-SHEET 2.

INVENTOR. A 5. BL 0 X6 0M.

A TTORNE Y.

UNITED STATES.

.PT T OFFICE.

ARTHUR E. BLoXsOM, or PUEBLO, COLORADO.

DOOR-LATCH.

Specification of Letters Patent.

' Patented Mar. 8, 1921.

Application filed June 18, 1919. Serial No. 305,022.

2' 0 54% whom it may con-0cm:

Be it known that I, ARTHUR E. BLoxsoM, a citizen of the United States, residing at Pueblo, in the county of Pueblo and State of Colorado, have invented certain new and A further object of my invention is to provide a device of the type referred to, the operating mechanism of which is contained within a pocket of the door frame, and still another object is to provide a locking mechanism for the latch bolt which is normally inoperative and which becomes effective only by contact with the door during its closing movement. j 4

\Vith the above and other objects in view, all of which will fully appearin the course of the following description, my improved door latch which is particularly designed for use on automobiles, consists of the construction and combination of parts shown in their preferred form in the accompanying two sheets of drawings in the several views of which like parts are similarly designated and in which Figures 1, 2 and 3 represent horizontal sections of a door-frame to which the invention is applied, showing the operating mechanism of the same in its normal posi-. tion and in two distinctive operating positions in which it is placed by the closing movement of the door;

Fig. 4, a vertical section through the door-frame and the latch on the line 47- 1, Fig. 1, and

Fig. 5, a vertical section through the. frame and the latch taken on the line 5-5, Fig. 1.

Referring to the drawings, the reference numeral 2 designates thedoOr-frame preferably provided with a stop '3, and 1 the hinged door which in its edgehas a tapering metal-lined socket 5 to admit the sliding latch-bolt of the mechanism the operating parts of which are contained in their entirety in a casing 6 fitted within a pocket of the frame.

'l'helatch mechanism consists Of a bolt 7 which has a curvilinear sliding movement through an aperture 8 in the edge of the amb plate9 of the casing to gradually enter the socketof the door during its closing movement. 7

A bent bolt-actuating lever '10-has a long arm 12 which in the normal condition of the mechanism projects into the door openlng through an aperture 13 in the jambplate of the casing, and a short arm 14 which has a movable connection with thebolt 7.

The bolt is guided in its operative movement by a pin 15 extending through a lon- 'git'udinal slot 16 of its body portion and it has at the inner edge of its said portion a series of ratchet shaped notches 17 for c0- operation with a locking pawl 18 which for convenience in construction is pivoted on the pin 19 which constitutes the fulcrum of the lever.

A double-action spring 20 yieldingly holds the lever in its projecting position when the mochanism'is in its idle condition, and maintains the pawl in engagement with the notches of the bolt when the latter extends into the socket of the door.

The shortarm 14 of the lever projects loosely into a socket 21 in the end of the latch bolt andit has curved cam faces which are engaged by anti-friction rollers 22 at the outer end of the socket of the bolt.

The curvature of the short arm of the operating lever is such that when the lever is moved about its fulcrum by contact with the closing door as will hereinafter be more fully described, its points of contact with the locking bolt will gradually recede from the fulcrum so that as the door nears its closing position the movement of the bolt is' accelerated to cause it to fully occupy the socket 5 when the door is closed.

"Vhen the door is in the open position, the pawl is held free from the notches of the latch-bolt by a keeper 23 which projects slidingly through an opening in the bottom of a shallow recess 24in the jambplate of the lock casing. The keeper has a rounded head 25 adapted to enter the recess and it has at its opposite end a longitudinal slot through which the pawl loosely extends.

A coiled spring 26 fastened at its ends to the keeper and to the part of the casing through which the keeper extends serves to pull the latter tothe position 'in which its head projects into, the door openingand the pawl is held free from the notch inthe locking bolt, when the door is open and the locking IRBChaIHSIn is accordingly 1n anlnactive condition. r

The key or releasing member which the boltis released for its Withdrawal from the socket in the door may be of. any suitable construction. In the form illustrated in the drawings, it consists of a longitudinally movable headed stem 27 provided end of the long arm of the operating lever projects under the influence of-the spring 20, into the door opening, and the spring 26 holds the keeper 23 in the position in which its head projects into the door opening, the pawl is in consequence. separated from the notches in the latch-bolt, and the latter is withdrawn from the door-opening and extends in its entirety within the casing in which the latch mechanism isassembled.

It will be noticed that with the parts thus relatively positioned, the lever 10 may be moved about its fulcrum without looking the bolt so that if by accident or in play the projecting end of the lever is pushed intoits casing. the operative condition of the lock is not affected and the parts will be automatically returned to their normal relative positions, by the spring 20 as soon asthe lever is released. i-

When the door is moved to its closed posi-' tion, it first of all engages the head of the keeper and presses it into the recess. of the door jamb against the pulling action of the spring 26, with the result that the pawl 18 15 released andpermitted to move into en-' gagement with the notches of the locking bolt by the pressure of the spring 20, as shown in Fig. 2. a w

Upon further inward movement of the door its forward side engages the projecting end of the lever 10 and moves the latter about its fulcrum,fthereby causing the bolt 7 to beproj ected into the door opening.

" I The socket 5iin theedge of the door is at this. time in register with the aperture of the j amb-plate through which the latch-bolt has its movement so that when the bolt isshot movement.

opening in by the initial motion ofthe lever it imme diately enters the socket of the door and thusprevents the latter from backward The continued closing movement of the door causes the bolt to move farther into its socket until at the time the door has reached its full' closed position in engagement with the stop 3. as shown in Fig. 3, the end of the lever is entirely retracted from the door-- opening and the bolt is fully projected into the socket. Y I l The parts are. secured in this position by the engagement of the spring-press'ed-pawl with a notch of the bolt and can-be released only by operation of the key which separates the pawl from the bolt as hereinbefore described.

. The last part of the movement'of the bolt into the door-socket isaccelerated by the decreased leverage of the lever so that all play between the end of the bolt and the shoulder of the socket is taken up when the door reaches its closed position.

It will be seen that bythe use of my in-' vention a door may be securely locked by moving it to its closed position without slamming and without the manipulation of bolt-retracting parts, and that for these reasons the lock is of particular value foruse onmotor driven vehicles to secure the doors in the body thereof. I 7

Having thus described my improved latch mechanism .in the best form at present known to me. I desire it understood that variations in the form and arrangement of its component parts may be resortcdito within I thespirit of the invention as set forth in the appended claims:

What I claim and desire to secure by Let ters-Patent is: c

The combination with a socketed swing in}; door and a frame having an opening into which the door closes, of a lever nor mally projecting into the opening and adapted to be retracted by the door in its closing movement. a-notched bolt adapted to be proiected into the door opening by movement of the lever, to. enterthesocket of the door a awl adapted to engaqe a notch in the bolt, to lock the latter ingits projected position, and a key adaptedto disengage the pawl from the bolt.

2. The combination witha vsocketed door and a frame having an opening into which the door closes, of a lever normally project'- ing intothe'opening to, be engaged by the door in its closing movement, a notched bolt adapted to be projected into the door opening by movement. of the: lever to enter a socket of the door, a pawl adapted to move.

into engagement with'anotch in the bolt to lock the latter in its PIOjQCtGdPOSltlOH, a movable keeper controlling the movement of the pawl l and proje cting normally into.

the opening to be moved by contact of the door, and a key adapted to disengage the pawl from the bolt.

The combination with a socketed door and a frame having an opening into which the door closes, of a lever normally projecting into the opening to be engaged by the door in its closing movement, a notched bolt adapted to be projected into the door opening by movement of the lever, to enter a socket of the door, a pawl adapted to move into engagement with a notch in the bolt to lock the latter in its projected position, a sliding, spring-actuated keeper controlling the movement of the pawl and projecting normally into the opening to be moved by contact of the door, and a key adapted to disengage the pawl from the bolt.

7 i. The combination with a socketed swinging door and a frame having an opening into which thedoor closes, of a springpressed lever normally projecting into the opening and adapted to be retracted by the door in its closing movement, a notched bolt adapted to be projected into the door openby movement of the lever, to enter the socket of the door, a spring-pressed pawl adapted to engage a notch in the bolt to lock the latter in its projected position, and a key adapted to disengage the pawl from the bolt.

5. A door-latch comprising in combination, a casing having an apertured jambplate, a lever normally projecting through an aperture of the plate, a notched bolt adapted to be projected through another aperture of the same and having a movable connection with the lever, a pivoted pawl adapted to move into engagementwith a notch of the bolt to lock the latter in a projected position, a keeper movable in an aperture of the plate and controlling the move ment of the pawl, and a key adapted to disengage the pawl from the bolt.

6. A door-latch comprising in combination, a casing having an apertured jambplate, a lever normally projecting through an aperture of the plate, a notched bolt adapted to be projected through another aperture of the same and having a movable connection with the lever, a pivoted pawl adapted to move into engagement with a notch of the bolt to lock the latter in a projected position, a keeper movable in an aperture of the plate and controlling the movement of the pawl, a spring yieldingly resisting the inward movement of the keeper, and a key adapted to disengage the pawl -from the bolt.

7. A door-latch comprising in combination, a casing having an apertured jambplate, a notched bolt adapted to be projected through an aperture of the plate, a lever having a long arm normally projecting through another aperture of the plate and adapted to operate the lever by the contact of a door swinging across the jambplate, and a short arm in impellant contact with the belt, a pivoted pawl adapted to engage a notch in the bolt to lock the latter in a projected position, and a key adapted to disengage the pawl from the bolt.

8. A door-latch comprising in combination, a casing having an apertured jambplate, a notched bolt adapted to be projected through an aperture of the plate, a lever having a long arm normally projecting through another aperture of the plate, and a short arm having a curved cam of varying leverage in impellant contact with the bolt, a pivoted pawl adapted to engage a notch in the bolt to lock the latter in atrolled member adapted to lock said one member in its projected position, and a member normally projecting into the opening and controlling the action of the keycontrolled member.

10. A door-latch comprising in combination with a swinging door and a frame having an opening into which the door closes, a member normally projecting in the opening and adapted to be retracted by contact of a door moving into the same, a second member connected with the other member to be projected into the opening by the retraction thereof, and key-controlled means automatieally locking the projected member against retraction when the door is closed.

In testimony whereof I have ailixed my signature.

ARTHUR E. BLOXSON.