US2580237A - Latch - Google Patents

Description

Dec. 25, 1951 F. MGCONNELL LATQH 2 SHEETS-SHEET 1 Filed May 8 7 47 TOR. FRANK M CONNELL FIG. 2

ATTORNEY$ Dec. 25, 1951 Filed May 8, 1947 F. MCONNELL LATCH FIG. 4.

2 SHEETS-SHEET 2 FRANK M CONNELL ATTORNEYS.

INVENTOR.

Patented Dec. 25, 1951 V UNITED STATES OFFICE LATCH Fr'ahk McConnell; New Britain; Count, assigiior to The American: Hardware Corporation, New Britain, Conn-., a corporatioiia of Go'ririecti'ut Applicatiori May s, 1947, Serial No". 7461768 My invention relates to latching devices and;

in particular to those are adaptable to" a door or the like.-

It is an object of m invention'to provide animproved device of the character indicated.

It is another object to provide an improved:

dogging mechanism tor a latch device or are character indicated; I

It is a general object to'provide a simple, less expensive;- and more reliable construction for a latching device or the character indicated.

Other objects and various filrther featuresof the invention will be pointed out or will occur tothose skilled in the are; from a reading o'fi' the following specification conjunctionwith the drawings" included herewith. In said drhwingsf Fig. 1 endvi'ew of a latchingdevi W cording to the invention, shown assembled position on a door;- 7

Fig. 2 is a side View of the latch of Fig. 1,

shown with the ecverfcf latch ease retrieved:-

7 Fig. 3 is a sectional view taken substantially in the plane 3--3'of Fig; 2; V Fig. 4 is a view similar to Fig. 2, but with parts in'- adiffererlt r-ela-tio" illilstla't runeum ing means. The dogging mechanism in aweferre'd form comprises ap'ivoted 1evef'havifig a dog and a cam-actuated'p'art; In the formto'be' described, the dog is at one end of the lever',--the pivot is centrally located, and the cam-actuating means is an eccentric engaginga'circulanopening at the other end of the lever; Other features of; the invention include resilient meanssfor main-- taining theeccentrie mechanism in one of two: selected positions and for disengaging thedog uponstrike-plate actuation of the latch bolt. Referring to the drawings, my invention is shown in applieat'iofi to a latch mechanism In contained within a generally rectangular latch case I I, to be inserted within a suitable opening in the door I2. The. front of the latch case may comprise a plate I 3 having projecting ends which may be secured by screws l4 into the door I2 Knobs I5-l6 may be journalled in rosettes I1-I8' mounted on opposite sides of the. door I2 and each knob may be secured to a spindle, I9, which in; turn may engage a part; oi the;

5: Ciaims: (01. 292169) latch a'ctuating mechanism 20. A further knob 21 may be mounted on one side of the door I2 to'actuate a part of the dogging mechanism 22 for dogging the latch-actuation mechanism 20. A la tch bolt 23 may slidably' project beyond the latch front or plate I3 and be resiliently urged in the extended position shown in Fig. 2, as by means of a spring 24, In the form shown, the latch bolt 2-3 is formed with an elongated central opening 25', the walls of which may serve as" guides in their engagement with a stud or boss 26 carried by the latch case II. The spring 24' is shown compressibly engagingthe boss 26 o that the extended position of the latch bolt 23." is determined by? atutifient or the boss 2-6 with the Bach end of the opening 25.

In the form shown, the latch-actuating mechanism 20 comprises a roll-back having two parts 21-28, both of which include hubs such as the hub 29. If ide'siired each'of-these hubs 29 may be eng'aged by a separate spindle I9 so that one of the knobs, say the ki-iob fi, may control the roll-back part 2 8 while the other of the knobs [6 may control the roll-backeleinent 21. In the form shown, no matter which oft-he knobs I'5-I6- is actuated, the generauy radio" projections of either one of the roll-back ele; en 21-28 may engage one of two lugs 30-41 forihedin the end of a latch plate 32 (see 4 The latch plate 32 may be longitudinall'y s'lidable to actuate the latch bolt 23, as by means of adog? or 1ug33 which may abut a projection 34 the latch bolt 23. The latch plate 32' is preferably always resiliently urged to the right (in the sense of Fig. 2), as by means of a compression spring 35 between a stop or abutment li omthe latch case and an upturned projection or lug 31 onthe latch plate. The rightward motion of the plate 32 will be understood to be limited by abutment of the roll-backengaging lugs 30 3I, with the roll-back ele- In accordance a feature of the invention, I provide a novel dog mechanism for selectably locking, aridthl'is disabling, the roll-back mech anism 20; In a preferred form this dogging mechanism; comprises essentially a dogging lever or plate 38fha'ving at one end a dog 39 toen'gage a dog-receivingrecess "411 formed in the roll-back eminent ZTj'for the outside knob Hi. The dog gi'fig plate 38 may prvo-taily supported, as by.

slotted engagement with the boss 26 which, it will be recalled, is carried by the latch case II. The other end of the dogging lever or plate 38 may be formed with an opening 49', which may be Oval er even an open fork but which in the form shown is circular so as to embrace cam means in the form of an eccentric surface 4L.

The eccentric 4| may be integral with the actuating element 42 of the dogging mechanism 22. It will be clear that upon a rotation of the dogging control knob 2| the actuating member 42 may be rotatably displaced from, say, the position shown in Fig. 1 to the position shown in Fig. 5. This displacement causes a corresponding displacement of the eccentric 41 with a result that the dogging lever or plate 38 may be shifted from the solid-line position of Fig. 6 to the dotted-line relationship of Fig. 6. In the latter position it will be seen that the dog 39 is in engagement with the roll-back element 21, in which position the roll-back element 21 will be understood to be effectively disabled so that latch operation by way of the knob 16 may be completely prevented.

In accordance with a feature of the invention, resilient means such as a spring 43 may compressibly abut a part of the latch case H and a projection 44 formed on the dog-actuating element 42. The spring 43 preferably engages one side of the projection 44 for a first adjusted retrol knob 2| in the wrong direction, abutment means may be provided to engage the dog-control element 42. In the form shown, the element 42 carries a projection 45 to engage a lug 45 formed as an upturned portion of lever 38. The other limiting position (as in Fig. of the actuating member 42 may be determined by abutment of a part 41 of lever 38 with the inside of the latch case, as when further rotation (counterclockwise in the sense of Fig. 5) of member 42 causes the eccentric 4| to attempt to raise part 41 further than the position shown in Fig. 5.

In accordance with still another feature of the invention, the dogging mechanism 22 may be disabled upon a depression of the latch bolt 23, as when the bolt 23 engages a strike plate upon a closure of the door [2. This function may be accomplished by abutment means cooperating between the latch bolt 23 and the actuating member 42 and tending to rotate member 42 clockwise. In the form shown, the inner end of the latch bolt may carry a projection 48 which may engage the projection 45 on the dog-actuating member 42. It will be clear from an inspection of Fig. 5 that even though the dogging mechan sm 22 be in locked position, that is, with the dog 39 engaging the roll-back element 3l, the projections 48-45 may be forcibly engaged when the latch bolt 23 itself is resiliently depressed as by a strike plate. This abutment may provide a clockwise turning moment sufiicient to over come the holding force of spring 43 and to displace the actuating. member 42 to a position in which it may be resiliently thrown into the Fig. 2 relationship of parts. The dog 39 will then be understood to be disengaged from the roll-back mechanism 20, so that operation ofdoor [2 by means of either knob -46 is again pos;ible.

It will be appreciated that I have described a relatively simple mechanism for dogging a latchactuating mechanism. The improved dogging construction may be fabricated of a single stamping of sheet material and yet they be completely positive in its action. Although the pivot of the dogging lever or plate 38 has been described as a slotted engagement as at 49, it will be understood that this arrangement was dictated by the nature of the eccentric construction for actuating the dogging lever 38.

While I have described my invention in detail for the preferred form shown, it will be understood that modifications may be made within the scope of the invention as defined in the appended claims.

I claim:

1. In a lock, a latch case, a latch bolt, actuating means for said latch bolt, and dogging means for locking said actuating means, said dogging means including a lever having an eccentric-engaging opening at one end and a central pivoted portion, an eccentric member journalled in said latch case and having an eccentric portion engaging the opening of said lever, abutment means cooperating between said eccentric member and said lever for determining a limiting rotary displacement of said eccentric member, and further abutment means cooperating between said latch bolt and said eccentric member when said eccentric member is in a position rotatably displaced from engagement with said first abutment means, wherebya forcible direct actuation of said latch bolt as by a strike plate may serve to actuate said eccentric member and said dogging lever.

2. In a lock, a latch case, a latch bolt, actuating means including a roll-back having a dog-engaging means, a lever having a dog to engage said dog-engaging means and pivotally supported by said latch case, said lever having an eccentricengaging opening, an eccentric member journalled in said latch case and including an cecentric to engage said opening.

3. In a look, a latch case, a latch bolt, actuating means including a roll-back having a dogengaging means, a lever having a do to engage said dog-engaging means and pivotally supported by said latch case, said lever having an eccentricengaging opening, an eccentric member journalied in said latch case and includin an eccentric to engage said opening, abutment means engaging said eccentric member to determine a first limiting rotary position thereof, said dog being out of engagement with said roll-back when said abutment is in near engagement with said eccentric member, and further abutment means cooperating between said latch bolt and said eccentric member in a second position of said eccentric member, said dog engaging said rollback for said second position of said eccentric member.

4. A device according to claim 3, in which said roll-back includes two parts, one of which has said dog-engaging means, whereby said dogging mechanism may be effective to lock said latch bolt against actuation when one of said roll-back elements is rotated, and whereby said dog may be ineffective to lock said latch bolt when the other of said roll-back elements is rotated.

5. In a device of the character indicated, a latch bolt, actuating means for said latch bolt, dogging means for said actuating means, said dogging means including a single lever doggingly engageable with said actuating means, eccentric actuating means for moving said lever into and out of engagement with said actuatin means, and throw-off means for said dogging means and including an abutment on said latch bolt in actuating relation with said eccentric actuating tion.

FRANK MCCONNELL.

REFERENCES CITED The following references are of record in the file of this patent:

Number 6 UNITED STATES PATENTS Name Date Andersen Dec. 16, 1924 Rightmyer Fen. 11, 1936 McCarter July 13, 1937 Gasstrom Sept. 27, 1938 Hurd June 27, 1939

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