US2379810A - Latch bolt holdback - Google Patents

Description

July 3, 1945. c. LEDIN ET AL LATCH BOLT HOLDBACK Filed Feb. 1, 1944 2 Sheets-Sheet 1 m 3 m m y %R Fe o mwi w l I A. 0/.C m j Z" u 1 F M "Jr W m Q, I 2 v M/d 0 2 Patented July 3, 1945 UNITED ATES PATENT OF Charles: Ledin andPhilip'T. Krause; I Stamford, Conn. 1 y a Application:Februaryl, 1944.ser a.1 No.520.5901.

'eoiainls. (01.292469) This invention relates .toa. hold: back for" use with a latchbolt; More; particularly, thisinvena tionirelatesto a holdiback fOlTllSB" with amight latch.

Latches, and more particularly' night latches-,1

areegenerally' equippfi'dtwith latch bolts sthat are spring projectedzandzare adaptedutobe retracted" bya thumb turnzlor the equivalentthereof. Since tiveview of anight'latch towhich-our invention is applied. Fig. Z-isaview looking. at the back of theinig'ht latch ofFig. 1 with the. rear plate: removed. Fig. v3- is. a-sectiontaken.a1ong.lines:3-3-

fer to the drawings wherein Fig. .1. is .a perspec of.-Fig.-.2. Fig.4isasection.takenalonglines 4+4.

ofFig. 3. Fig. 5 is. a.-.view similar to Fig. .3 showingthe latch boltinitsholdback position Fig.

6 is. a view similarto Fig. 2 but illustrating amodq ified. .form of the. invention in. which the. holdback device. istmounted. within the thumb turn. that-is. used. to. retractthe latch bolt. Fig. .7 is. a section takenalong-lines 1-1.ofFig.. 6.1 Fig. 8 is a view similar; tmE'ig... 6 but ;showing. the parts in the hold back .position 015, the. latch -bolt.. 9 is. a

retractth-e latch bolt beyond its-hold bacjkposiview of certain parts of Fig. 7 showingthe latch boltinits hold back position. I l V Referring now more. particularly to. the. drawings, .andfespecially Figs. 1-5finclusive; the latch casing of our. invention isdesig-nated byweference numeral I!) while the latch bolt mounted-thereon. is .designatedb'y reference numeral! I. 'Ih'e latch.

boltis projected by a spring. I2 in. a conventionalmanner and. is. retracted ,by. the pin l3 extending. from a cam plate 14, that is secured as a part of athumb turn. 151' As those skilled in the. art will readily appreciate, the structure thus far. set forth is entirely.conventional and is not per. se our inventionclaimgd herein.

The hold. back forming, our invention may. various forms but "we preferto use that typetha t is. shown; in: Figs. 1-5; In. those 'figuresflthe hold back: is shown; comprising a" push. button I6- 50; p button and slides within. a bore 34 in a casting take. I

mounted in a compound bore l1 formed in-thecasi-ng l0, the-inner'end ofthe pushbuttonbei-ng plate riveted at [8 to a holdrback plate-(B and a spring 20-that arewithin the casing Ill.

.qAs isclearly shown in Fig. 4; the plate spring- 20 has its opposed ends 2| resting within slots-22 formed in the casing, and urgesthe push button.

I6" toiitsouterz release position of. Fi 3. In this position of. the parts adetent lug 23- thatis part of the hold back platel'fl; is located :belowanear 24 bent downwardly fromthe plate portion 25 of the latch bolt I I. With thelatchv bolt projected as ,in Figs. 1, 2 and3, it-may. be retracted. by rotation of the thumbturn-to-the. position oflFigl 5,-thereby bringing ear of the. latch boltintoY itsdottedjline. position of 5. In this position ofthe ear24, the push button 1-6 may be depressed from its dotted-1ine1position of Fig. 5 touitsiull line position,..and.the latchbolt then released i or projection. Thelatch. boltwill -move onlyuntil the ear 24 reaches itsiull lineaposition .of Fig. 5,

withthendetentlugzarthe hold .backplate is within the undercut n'otch 2fi-yformed: in the said ear. I H

It is now obvious that the latch bolt will be held in its-hold f back position bythe: push ibutton l 6 andits hold back platel fl, Itis also obviousthat the. latch bolt car 24 will hold. the push button I'fi againstmovement to its release position-byplate f spring 20, .due to. the interlocking engagement of the. detentlug .23 with notch 26m ear 24. I

If now it is desired to projectthe latch bolt to itsposition of Fig. 1, his not=necessaryto actu-w ate the push button lfimanuallyt Itis only necessary to rotate the. thumb turn. [5 whereby to :tion to bringthe ear 24 to its dotted line positionofiFig. 5L Springplate 20 will then project the push button I6 to its position of Figs. 3 and. 4

, away from ear 24, and upon releaseof the thumb turn lithe latchbolt will spring outwardly.

In that .form oflourinvention illustrated in Figs. .6-9 inclusive, .thevhold. back operatingnpush. 1 button is mounted .for sliding. movement within a thumb turn 30 rather than in a bore 0f the casing as in the first modification. In the modiiication of Figs. 6 -9, the push button is designated by reference numeral 3| and it is urgeditoan outward release positionby a spring 32jmounted aboutia guide pin 33 that isfi'xed-to the push 35forming part of the body of the thumb turn 30; as is well illustrated in the drawings.

The pushbuttonihhasa pin 36 extending.

1 therefrom into the castingllfla of the latch bolt,

FICEY and said pin 36 is formed with a, notch 31 adapted to interlock with the lug 38 of the plate 39 of the latch bolt 40. tracted by thumb turn 30 through its cam pin 30a, to bring the lug 38 beyond the end of the pin 36, the push button 3! ma be depressed to the position of Fig. 9. If the latch bolt is then released for projection by its spring I2a, the lug 38 will enter the notch 31 of the pin 36. This will efiectively block the movement of the latch bolt from its hold back position to its projected Thus, if the latch bolt is reposition and will simultaneously retain the push button 3| in its hold back position of Figs. 3

and 9.

If it is now desired to allow projection of ,the

latch bolt, it is only necessary to retract the latchv bolt beyond its hold back position of Figs. 8 and 9, withdrawing the lug 38 of latch bolt plate 39' v The pin 36 and push button 3! will then be spring projected to the from the notch 31 of pin 36.

release position of Fig. 7, and the latch bolt when released by thumb turn 30 will spring outwardly to its position of Figs. 6 and '7.

We believe that the operation" and constructionof our invention will now be apparent to those skilled in the art. 1

We now claim: I '1. In a lock of the-class described, a casing, a latchbolt slidable on said-casing from a projected to a retracted position, a spring urging said latchbolt to its projected position, a push button, means mounting saidpush button for inward and outward sliding movement relatively to said casing, a spring pressing said push button outwardly relatively to said casing, means movable with to a retracted position, a spring urging said latchbolt to its projected position, a hold back button, means mounting said button for movement relatively to said casing, a spring pressing said button into a release position, means movable with said button against the force of saidbutton spring into hold back position to prevent movement of said latchbolt by said latch bolt spring from a retracted hold back position to a projected position,

and a part of i said latchbolt engaging said means whereby said latchbolt holds said hold back button against movement to release position.

3. In a lock of the class described, a casing, a latchbolt slidable'onsaid casing from a projected to a retracted position, a spring urging said latch bolt to its projected position, a'hold back button, means mounting said button for movement relatively to said casing, a spring pressing said button into a release position, means movable with said button against the force of said button spring into hold back position to prevent movement of said latch bolt by said latch bolt spring from a retracted hold back position to a projected position, and a part of said latchbolt engaging said means whereby said latchbolt holds said hold back button against movement to releaseposition,the retractionof said latchboltbeyond its hold back position releasing said hold back button for movement by its spring to its release posi-- tion. a

4. In a lock of the class described, a casing, a latchbolt slidable on said casing from a projected to a retracted position, a spring urging said latchbolt to its projected position, a push button mounted for sliding movement in a bore in said casing with the head of the push button exposed on the outside of the casing, a spring pressing s'aidbutton outwardly of said casing ,into release position, means movable with said button against the force of said button spring inwardly of said bore into hold back position to prevent movement of said latchbolt by said latch bolt spring from a retracted hold back position to a projected position, and apart of said latchbolt engaging said means whereby said latchbolt holds said push button against movement outwardly of said bore to said release position.

5. ma lock of the class described, a casing, a latchbolt slidable on said casing from a projected to a retracted position, a spring urging said latchbolt to its projected position, a push button mounted for sliding movement in a bore in said casing with the head of the push button exposed on the outside of the casing, a spring pressing said button outwardly of said easing into release position," means movable with said button inwardly of said bore against the force of said button spring into hold back position to prevent movement of said latchbolt by said latchbolt mounted for rotation on said casing, means ro-,

tatable with said thumb turn for retracting said latchbolt, 'a hold back button, means mounting said hold back button on said thumb turn with a part of said button extending inwardy of aid casing, a spring pressing said button relatively to said thumb turn into a release position, means movablewith said button against the force of said button spring into hold back position to prevent projected position, and a part of said latchbolt engaging said means whereby said latchbolt holds said hold back button against movement to re lease position. j

7. In a lock of the class described, a casing, a latchboltslidable on said casing from a projected to a retracted position, a spring urging said latchbolt to its projected position, a thumb turn mounted for rotation on said casing, means rotatable with said thumb turn for retracting said movable with said button against the force of said button spring into hold back position to prevent movement of said latchbolt by said latchbolt spring from a retracted hold back position to a projected position, and a part of said latchbolt engaging said means whereby said latchbolt holds 2,379,810 t a i said hold back button against movement to release position, the retraction of said latchbolt beyond its hold back position releasing said hold back button for movement by its spring to said release position. v

8. In a lock of the class described, a casing, a latchboltslidable on said casing from a projected to a retracted position, a spring urging said latchbolt to its projected position, a thumb turn mounted for rotation on said casing, means rotatable with said thumb turn for retracting said latchbolt, a hold back button, means mounting said hold back button in a bore of said thumb turn for inward and outward sliding movement withv a part of said hold back button extending inwardly of said casing and the head of said hold back button exposed outwardly of said thumb turn bore for depression, a spring pressing said button outwardly of said thumb turn bore into release position, means movable with said button against the force of said button spring into hold back position to prevent movement of said latchbolt by said latchbolt spring from a retracted hold l back position to a pro'jectedposition, and a part ment to said release position.

latchbolt, a hold back button, means mounting said hold back button in a bore of said thumb turn for inward and outward sliding movement with a part of said hold back button extending inwardly of said casing and the head of said holdv back button exposed outwardly of said thumb turn bore for depression, a spring pressing said 'button outwardy of said thumb turn bore into release position, means movable with saidbutton against the force of said button spring into hold back position to prevent movement of said latchbolt by said latch bolt spring from a retracted hold back position to a projected position, a part of saidv latchbolt engaging said means whereby said latchbolt holds said hold back button against movement to said release position, the retraction of said latchbolt by said thumb turn releasing said button for movement to said release position. i

CHARLES LEDIN. I PHILIP T. KRAUSE.

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