US2655027A

US2655027A - Door latch

Info

Publication number: US2655027A
Application number: US58050A
Authority: US
Inventors: Thomas L D Lynxwiler
Original assignee: Mills Ind Inc
Current assignee: Mills Industries Inc; Mills Ind Inc
Priority date: 1948-11-03
Filing date: 1948-11-03
Publication date: 1953-10-13
Anticipated expiration: 1970-10-13

Description

Oct. 13, 1953 T. l.. D. LYNXWILER DOOR LATCH Filed NOV. 5, 1948 Patented Oct. 13, *1953 DOOR LATCH Thomas L. D. Lynxwile to Mills Industries, I

a corporation of Illinois Application November 3, 1948, Serial No. 58,050

(Cl. Z- 208) 8 Claims.

This invention relates to devices for securing doors in closed position and more particularly to a door latch of a type suitable for use, for example, on the door of a refrigerated cabinet or the like.

An object of the invention is to provide a door latch which, when moved to latching position, will produce a strong clamping action drawing the door into tightly closed position.

Another object of the invention is to provide in a door latch of the above character, a simple and reliable means for locking the same in latched position A further object of the invention is to provide a door latch of the aforesaid kind having, as an integral part thereof, a member which may be disposed in a position ilush with the exterior surface of the door when the latch is in latching position, and which will be automatically exposed to serve as a door handle upon the unlocking of said latch.

Other objects and advantages of the invention will be apparent from the following description of a preferred embodiment thereof, taken in connection with the accompanying drawing, in which:

Fig. 1 is a fragmentary elevational view of the front of a refrigerated cabinet or the like showing a door latch of my invention mounted in a door on the cabinet, said latch being shown in its latching or closed position;

Fig. 2 is an enlarged sectional View, taken substantially on the line 2-2 in Fig. 1, showing in solid lines the position of the parts of the latch when the latter is locked to hold the door closed, and showing in broken lines the position of the parts when said latch is unlocked; and

Fig. 3 is a detailed elevational view showing the shape of a rotatable cam which serves to move a spring-loaded bolt to releasing position to unlock the latch.

In the drawing the numeral II) indicates a door which is mounted, as by hinges (not shown) upon the front of a cabinet or the like having a side II. ySaid door may be of the type commonly used on refrigerators and refrigerated cabinets, for example, and may have rounded side edges I2 which add to the appearance of the cabinet when the door is closed.

Flush with the external surface of the door I0 is a handle member, shown generally at I3, which comprises a body portion I4, from one side of which extends a handle I5 which may be of a shape conforming to the rounded edge I2 of the door. A flange I6 is formed on the inner side of the body portion I4 and extends horizontally inwardly therefrom. The handle member is disr, Ingleside, Ill., assignor ncorporated, Chicago, Ill.,

2 posed within a slot Il provided therefor in the door and is pivotally mounted therein by means of a pivot post I8 which is xed in a vertical position, in any suitable manner, to an inner surface I9 of said door and extends upwardly through a central portion of the flange I6.

A pivot pin 29 is xed on the upper surface of the flange IB and is adapted to ride in a slot 2l in a leg 22 of a catch member shown generally at 23. Said catch member is pivotally mounted upon a pivot post 24 which is fixed rmly, in any desired manner, upon the inner surface I9 of the door. A leg 25 on the catch member 23 has a pin 26 fixed thereon adjacent an extremity thereof and a roller 21 is mounted on the pin.

A strike member 28 is mounted upon the inner surface of the side I I adjacent a front edge 29 thereof, as by a plurality of bolts 3|] threaded into said side. A hook portion 3I is formed on the forward side of said strike and extends forward to a position opposite that of the catch member 23 when the door IIJ is in the closed position shown in the drawing. As will be seen in Fig, 2, the hook portion 3l is adapted to be engaged by the roller 21 on the leg 25 of the catch member 23. A tension spring 32 is attached at one of its ends to the leg 25 on the catch member 23 adjacent the roller 2l and is fastened at its other end to a pin 33 which is xed in any suitable manner to the door Il). The spring 32 tends to rotate the catch member 23 in a counter-clockwise direction about the pivot post 24, as seen in Fig. 2.

A cylinder-type lock of a well-known construction, shown generally at 33, is mounted in the body portion I4 of the handle member I3 and is rotatable as `by a key 34 which may be inserted into a keyhole 35 in said lock. Fixed upon the inner end of a rotatable portion 3B (Fig. 3) of said cylinder lock is a cam 37 which is disposed within a slot 38 provided therefor in the body portion I4 of the actuating member I3.

To the left of the body portion I4 of the handle member I3, as seen in Fig. 2, a guide frame 39 is fixed horizontally on the inner surface I3 of the door on a level with said body portion. A bolt 43 having a beveled outer edge 4I is supported by the guide frame and is arranged to be moved therein in reciprocating motion. A compression spring 4i is disposed in the guide frame between an inner end 39 thereof and the inner end of the bolt 40, thus tending to move the bolt to the right, as seen in Fig. 2, to cause said bolt to protrude from the guide frame and occupy a position immediately behind the body portion I4 of the handle member I3 and opposite the cam 3l.

The position of the parts of the above-described device, when the door is closed and latched, is shown by the solid lines in Fig. 2. In this position the bolt 40 protrudes from the guide frame 39 to the above-described position immediately behind the body portion I4 of the handle member I3 and prevents the latter from being pivoted about the pivot post I8. The handle member is thus retained in its locked position in which the handle I of said member is disposed in the slot I1 in the door in a position flush with the external surface of the door, and the catch member 23 is held with the roller 21 in engagement with the hook portion 3l of the strike 2-8 to hold the door in closed position.

To open the door I9, the key 34 is inserted into the keyhole 35 and the cylinder lock 33 is turned. Turning of the lock rotates the cam 31 to the position shown by the broken lines in Fig. 3 wherein said cam engages the outermost end of the bolt il), and depresses the same into the frame 39 against the compression spring 4I. When the -cam 31 has moved the bolt 43 to a position clear of the adjacent end of the body portion I4 of the handle member I3, the latter is free to pivot, whereupon the force of the tension spring 32 will pivot the catch member 23, in a counter-clockwise direction, to the position shown by the broken lines in Fig. 2, to disengage the roller 21 from the `hook portion 3| of the strike 28 and release the door. Pivotation of the catch member 23 about the pvot post 24 will pivot the handle member 'I3 in a clockwise direction (as seen in Fig. 2) about the pivot post I3 to the position shown by the broken lines, wherein the handle I5 will be exposed and may serve in the normal capacity of -a handle for the manipulation of the door. As soon as the handle I5 has been exposed as aforesaid, the key 34 may be further turned in the lock 33 to return the cam 31 to its normal position, shown by the solid outline thereof in Fig. 3, whereupon said key may be removed from the lock, if desired.

To close and lock the door said door is rst moved to closed position and the handle I5 is then pressed inwardly toward the door to pivot the handle member I3 about the pivot post I8 in a counter-clockwise direction. The edge of the body portion I4 engages the beveled surface `III of the bolt 40 to depress the latter to allow the .returning movement of the handle member. Through the articulation of the catch member 23 with the handle member I3, the returning movement of the latter pivots the catch member in a clockwise direction to re-engage the roller 21 with the hook portion 3| of the strike 28. As said roller engages said hook portion 3I, it will be seen that by reason of the pin-and-slot connection between the members I6 and 22 and the leverage resulting from the distance between the pivot points I8 and 24 thereof continued movement of the handle I5 toward its normal locked position ush with the surface of the door will exert a strong clamping action between the parts of the device and the hook portion 3I of the strike, thereby drawing the door into a tightly closed position. This feature of my device is one of the objects of the invention and its advantage, when employed on the door of a refrigerator or the like, for example, will be evident to those acquainted with the art.

When the handle I5 has been returned to its position flush with the surface of the door I0, the end of the body portion I4 of the handle member I3 will have cleared the bolt 40 and the latter,

due to the force of the compression spring 4I', will snap outwardly to its locking position behind the said body position, whereupon all of the parts will have been returned to their normal locking positions and the door I0 will be held tightly closed.

The foregoing detailed description has been given for clearness of understanding only, and no unnecessary limitations should be understood therefrom, for it will be apparent that various changes may be made in the form and construction vof the device of my invention without departing from the spirit and scope of the invention.

Iclaim:

1. A door latch for a cabinet, comprising: la handle member pivotally mounted on said door; a catch member articulately connected to said handle member and pivotally mounted on said door, said catch member being moved into clamping engagement with a strike on the cabinet in the pivotation of said handle member to locking position, thereby holding said door in tightly closed position, a bolt movably mounted on said door and engageable with said handle member to retain the latter in said locking position; a rotatable cam on said handle member engageable with said bolt for disengaging the latter from said handle member; and biasing means operable to pivot said handle member from said locking position upon disengagement vof said bolt 'therefrom to thereupon disengage said catch member from said strike and thereby unlatch said door.

2. A door latch for a cabinet, comprising: a handle member pivotally mounted on said door; a catch member articulately connected to said vhandle member and pivotally mounted on said door, said catch member being moved into clampn'ing engagement with a strike on the cabinet in the pivotation of said handle member to locking position, thereby holding said door in tightly closed position; a bolt movably mounted on said door and engageable with said handle member to retain the latter in said locking position; a rotatable lock in said handle member; a cam 'op- -erated by said lock and engageable with said bolt for disengaging the latter from said handle member; and biasing means operable to pivot said handle member from said locking position upon disengagement of said bolt therefrom to thereupon disengage said catch member from said strike and thereby unlatch said door.

3. A door latch for a cabinet, comprising: a handle member pivotally mounted on said door; 'a catch member articulately connected to said hanfdle member and pivotally mounted on said door, said catch member being moved into clamping engagement with a strike on the cabinet in the pivotation of said handle member to locking position, thereby holding said door in tightly closed position; a bolt movably mounted on said door and engageable with said handle member to retain the latter in said locking position; a rotatable cam on said handle member engageable with said bolt for disengaging the latter from said handle member; and spring means operatable to pivot said handle member from said locking position upon disengagement of said bolt therefrom, thereby disengaging said catch member from said strike and unlatching said door.

4. A door latch for a cabinet, comprising: a

lhandle member pivotally mounted on said door and having an inwardly extending iiange thereon; a catch member pivotally mounted at another point on the door and having a leg portion articulately connected to said flange by a pin-and-slot connection, said catch member being movable into engagement with a strike on the cabinet by pivotal movement of the handle member, the pivot points of said handle member and said catch and the connection between said handle ilange and said leg portion of the catch being so related that said handle member has a further motion after engagement of the catch with the strike to thereby firmly clamp the catch into the strike and hold the door in tightly closed position; a lock for holding said catch and handle members in locked position, said lock including a slidable bolt; a cam operable by the lock to cause movement of said bolt to unlocking position when the lock is unlocked, said handle being then movable to unlocked position and said bolt being movable back to locking position if said cam has been returned to the position occupied by it when the lock is locked; and means independent of said cam and operable by the handle upon movement thereof to locked position for temporarily moving said bolt to its unlocking position to provide clearance for the handle member in its movement to said locked position, the bolt being thereafter again movable to its locking position.

5. A door latch for a cabinet, comprising: a handle member pivotally mounted on said door and having an inwardly extending ange thereon; a catch member pivotally mounted at another point on the door and having a leg portion articulately connected to said ila-nge by a pin-and-slot connection, said catch member being movable in one direction into engagement with a strike on the cabinet by pivotal movement of the handle member in the opposite direction, the pivot points of said handle member and said catch and the connection between said handle flange and said leg portion of the catch being so related that said handle member has a further motion after engagement of the catch with the strike to thereby firmly clamp the catch into the strike and hold the door in tightly closed position; a lock for holding said catch and handle members locked in closed position; and means normally tending to move said members to unlocked position whereby they are moved to such position upon unlocking of said lock, the handle in the latter position being projected from the door whereby it may be grasped for opening the door.

6. A door latch for a cabinet, comprising: a handle member pivotally mounted on said door and having an inwardly extending flange thereon, said handle member when in closed position being flush with the external surface of the door; a catch member pivotally mounted at another point on the door and having a leg portion articulately connected to said ange by a pinand-slot connection, said catch member being movable into engagement with a strike on the cabinet by pivotal movement of the handle member, the pivot points of said handle member and said catch and the connection between said handle flange and said leg portion of the catch being so related that said handle member has a further motion after engagement of the catch with the strike to thereby rmly clamp the catch into the strike and hold the door in tightly closed position; a lock for holding said catch and handle members locked in closed position; and means normally tending to move said members to unlocked position whereby they are moved to such position upon unlocking of the lock.

7. A door latch for a cabinet, comprising: a -handle member pivotally mounted on said door and having an inwardly extending ilange thereon; a catch member pivotally mounted at another point on the door and having a leg portion articulately connected to said flange by a pinand-slot connection, said catch member being movable into engagement with a strike on the cabinet by pivotal movement of the handle member, the pivot points of said handle member and said catch and the connection between said handle flange and said leg portion of the catch being so related that said handle member has a further motion after engagement oi the catch with the strike to thereby firmly clamp the catch into the strike and hold the door in tightly closed position; a bolt movably mounted on said door and engageable with said handle member to retain it and said catch member locked in said closed position; means for moving said bolt to unlocking position; and means normally tending to move said members to unlocked position whereby they are moved to such position upon such movement of said bolt.

8. A door latch for a cabinet, comprising: a handle member pivotally mounted on said door and having an inwardly extending ange thereon; a catch member pivotally mounted at another point on the door and having a leg portion articulately connected to said flange by a pin-and-slot connection, said catch member being movable into engagement with a strike on the cabinet by pivotal movement of the handle member, the pivot points of said handle member and said catch and the connection between said handle flange and said leg portion of the catch being so related that said handle member has a further motion after engagement of the catch with the strike to thereby rmly clamp the catch into the strike and hold the door in tightly closed position; a bolt movably mounted on said door and engageable with said handle member to retain it and said catch member locked in said closed position; a spring normally urging said bolt to handle-engaging position; and means normally tending to move said handle and catch members to unlocked position upon unlocking movement of said bolt.

THOMAS L. D. LYNXWILER.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date '781,272 Dalrymple Jan. 31, 1905 2,255,418 Fletcher Sept. 9, 1941 2,461,393 Paxton Feb. 8, 1949 FOREIGN PATENTS Number Country Date 15,768 Norway Apr. 10, 1906 83,363 Sweden Mar. 7, 1935 187,646 Switzerland Feb. 16, 1937