US2262284A - Combined door latch and lock - Google Patents

Description

NOV. 11, 1941. J R U 2,262,284

COMBINED DOOR LATCH AND LOCK Filed Sept. 22, 1939' 2 Sheets-Sheet l IN V EN TOR.

ATTORNEYS.

Nov. 11, 1941. J, R, HULL COMBINED DOOR LATCH AND LOCK Filed Sept. 22, 1939 2 Sheets-Sheet 2 /0 d IN V EN TOR.

ATTORNEYS.

Patented Nov. 11, 1941 UNITED STATES PATENT OFFICE COMBINED DOOR LATCH AND LOCK John R. Hull, Detroit, Mich.

Application September 22, 1939, Serial No. 296,137

3 Claims.

This invention relates to combined door latch and lock construction, the primary object of the invention being to provide a door latch wherein the spindle thereof is constructed to operate the sliding bolt or latch of the lock, in a horizontal plane by pushing or pulling the handles or knobs secured to the ends of the spindle.

An important object of the invention is to provide a door latch of this character having means whereby the spindle may be locked against movement to prevent the operation of the latch and opening of the closure on which the latch is mounted, by unauthorized persons.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein described, may be made within the scope of what is claimed, without departing from the spirit of the invention.

Referring to the drawings:

Figure 1 is a sectional view through a latch and door lock constructed in accordance with the invention.

Figure 2 is a sectional view taken on line 22 of Figure 1.

Figure 3 is a sectional view taken on line 3-3 of Figure 1.

Figure 4 is an enlarged sectional view taken at right angles to Figure 3.

Figure 5 is an enlarged sectional view through a portion of the combined lock and latch, illustrating the locking cone as moved to its inactive position.

Referring to the drawings in detail, the latch housing is indicated generally by the reference character 5 and the reference character 6 designates the keeper plate of the latch, which is provided with the usual sliding bolt opening to receive the sliding bolt, which in the present showing is indicated by the reference character I. Secured to the sliding bolt 1 and extending inwardly from the inner end thereof, is a bolt 8 on which the coiled spring 9 is mounted, one end of the coiled spring engaging the inner end of the sliding bolt T, while the opposite end thereof engages the washer III that bears against the bifurcated end I I of the lever I2, which is pivotally mounted within the housing. Connected with the lever I2, at a point above the pivot thereof, i a link I3 that has one end thereof connected to the upper arm of the bell-crank lever I I, at

I5. The opposite arm of the bell-crank lever I 4 extends rearwardly within the latch housing where it engages the sliding spindle I6 or spindle of the latch. The spindle I6 is formed with a cut-out portion defining an inclined surface I! against which the inner end of the bell-crank lever I4 engages. A coiled spring indicated at I8 is mounted within the sliding spindle I6, and bears against the pin I9 that extends transversely through the slot 20 formed in the spindle. Thus it will be seen that due to this construction, the sliding spindle l6 will be normally urged to the position as shown by Figure 2 of the drawings.

A coiled spring indicated at 2| is connected with the lever I2, near the bifurcated end thereof, the opposite end of the spring being anchored to the plate 22 that is secured within the latch housing 5. This spring 2I acts to return the lever I2 to its normal position as shown by Figure 3, after it has been actuated to unlock 0r unlatch the door.

The locking means for holding the sliding bolt 1 against movement, includes the substantially cone-shaped head 23 which is carried at the inner end of the rod 24 which in turn extends through the escutcheon plate 25, where it connects with the handle 26 carried at the inner end of the sliding spindle I6, through the medium of the pin 24' that moves in the groove 25 formed in the rod 24. Due to this construction, the rod 24 is free to rotate within the handle 26 but is secured to the handle to slide therewith. The connections between the handle 26 and sliding spindle I6 is such that the handle 26 is permitted to move slightly with respect to the sliding spindle I6. A pin indicated at 21 extends through an elongated opening formed in the sliding spindle I6 and connects with the handle 26, as clearly shown by Figure 2 of the drawings. A coiled spring indicated at 28 is fitted within an opening at one end of the sliding spindle I6 and bears against the pin 21 normally urging the handle 26 inwardly towards the door or closure on which the latch is used.

The cone-shaped head 23 is provided with a flattened portion 29 which is so disposed that when the cone-shaped head has been moved to a predetermined position, the flattened portion will lie directly opposite to the inner end of the link I3, permitting of slight movement of the link I3, for purposes to be hereinafter more fully described.

As clearly shown by Figure 5 of the drawings, the cone-shaped head 23 is formed with a rectangular opening for the reception of the lock bar 30 which is also rectangular in cross section to closely fit within the opening but at the same time permit of movement of the cone-shaped head 23 with respect to the bar.

The bar 30 extends into the lock barrel 3| which is actuated in the usual manner, by the I In the operation of the lock or latch, when the sliding bolt and bell-crank lever with its connected parts, are in the positions as shown in full lines in Figure 3 of the drawings, and the head 23 is in a position to be engaged by the inner end of link l3, the sliding bolt 1 is in its locked position. In other words, with the elements in this position, it would be impossible to move the outer handle to slide the spindle 16 to operate the bellcrank lever." In order to allow for movement of the bell-crank lever and its connected parts, it is necessary to rotate the lock bar-3|] to move the head 23 until the flattened portion thereof is directly opposite to the inner end of link l3. With the flattened portion in this position, there is sufflcient clearance to allow the link l3 to move towards the head 23. It is obvious that upon further sliding movement of the sliding bar 30, the head 23 will be moved to the position as shown by Figure 5 of the drawings, allowing clearance to permit the movement of the bell-crank lever 14, link l3 and lever I2, to the positions shown in dotted lines in Figure3, whereupon the sliding bolt 1 is retracted from the keeper plate opening.

It is obvious that when the handle 33 is released, the handle together with its spindle l6, as well as the head 23, will be returned to their normal positions.

Should it be desired to operate the sliding bolt by means of the handle 26, which is, the inner handle of the latch, it is only necessary to pull the handle 26 towards the operator. As'the handle is moved, the rod 24 and head '23 are moved out of the path of travel of the inner endof the link; l3, allowing the inclined surface of the spindle it to move over the lower arm of theibellcrank lever M, to actuate the elements'of the latch.

f bolt operating within the latch housing, a slid- In view of the foregoing detail disclosure, a further description as to the operation of the device is believed unnecessary.

What is claimed is:

1. In a door latch, a latch housing, a sliding bolt operating within the housing, pivotally connected levers connected with the bolt and adapted to operate the sliding bolt, a slidable rotary locking member. disposed within the path of travel'of said levers preventing movement of said levers and bolt, means for sliding the locking member to disengage said levers, and means for moving the levers and sliding bolt to their unlocked position.

"2. In a door latch, a latch housing, a sliding ing spindle movable through the housing, levers operated by said spindle and adapted to operate the sliding bolt, 2. head movable within the housing and engaging one of the levers preventing movement of said levers and sliding bolt, means at one side of the housing for sliding the head out of contact with said levers, said head having a reduced portion, and means at the opposite side of the housing for rotating the head, whereby the reduced portion of the head rests'opposite to said levers providing a clearance for said levers permitting movement of the levers and sliding bolt.

3. In a door latch, a latch housing, a sliding bolt movable through the latch housing, a plurality of connected levers mounted within the housing, one of said levers being connected to the sliding bolt, a sliding spindle having a cam suriace adapted to move over one of said levers operating the levers and'sliding bolt when the spindle is moved in one direction, means for locking the levers and sliding bolt against movement, said means embodying a head having a tapered inner end, said head normally engaging one of said levers preventing movement of the levers .and sliding bolt, said head having a flattened portion providing a clearance, means at one side of the housing for rotating said head whereby the flattened portion thereof. is moved opposite to the levers permitting a clearance allowing movement of the levers and sliding bolt, and means at the opposite side of the housing for sliding the head away from said levers permitting movement of the levers and bolt.

JOHNR.

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