US1712336A - Latch construction - Google Patents

Description

V May 7, 1929.

A., EKMAN LATCH CONSTRUCTION Filed June 22, 1928 INVENTOR Hman 2; i M l A TTORNE y ,.4 n mv ME@ 1 BY fzarew Patented May 7, 1929.

UNiTED STATES PATENTA OFFICE.

ANDREW ERMAN, er GRAND RAPIDS, MICHIGAN, AssIGNOR To `GRAND RAPIDS BRAss COMPANY, or GRAND RAPIDS, MICHIGAN, A CORPORATION OR MICHIGAN.

LATCH CONSTRUCTION.

Application filed .Time 22,

This invention relates to latch construc tion particularly suitable for use on ice b oX-` es, refrigerator doors, cabinets and the like. The main Objects of this invention are to provide an improved forni of latch or b olt which can be locked with a key and which remains securely locked until a particular forni of simple key is used for unlocking the same. j

An illustrative embodiment of this invention is shown in the accompanying drawing in which:

Fig. 1 is a plan view of my improverl forni of latch mounted on a door therefor. e

Fig. 2 is a bottom plan viev7 of the device showing the interior Construction, parts thereof being broken away to more clearly show the arrangement.

Fig. 3 is an enlarged fragnientarydetail partly in section showing the key inserted in the locking barrel.

Fig. 4 is a sectional view taken on the line 1 4 of Fig. 1.

F ig. 5 is an enlarged sectional vieiv takenon the line 5 5 of Fig. 1. e

Fig.` 6 is a medial vertical sectional View of the sleeve for surrounding and retaining the barrel of the locking device in the handle.

In the construction shoivn in the drawings my improved device comprises an Outer shell or casing 1 of pressed sheet metal or the like which is dome shaped in. character and provided at opposite sides With lateral flanges having holes 2 punched or otherwise suit-- ably formed therein adapted to receive screws 3 for attaching the shell to the device upon which it is used. lhemedial portion of the casing 1 is shaped with steeply sloping` side Walls which are punched or drilledin alignment for receiving and carrying a trans versely disposed pin ll. The pin 4l pivotally supports the head `end v5. of a handle G, the casing 1 being suitably slotted to snugly receive said head end 5 as shown most clearly in liig. a of the drawings.

The handle 6 is provided with an enlarged body portion 7; closely adjacent to the head 5, which has a hole 8, drilled transversely to the top plane thereof and substantially at right angles to the pin el. hole 8 through the head 7 is of uniform diameter until Closely adjacent the lower or underside thereof at which point it is of reduced and frame `registry therewith 192s. serial No. 237,359.

The outer end of `the sleeve 1() has an in# Wardly turned flange 11 `which fits over the` marginal peripheral face ofthe barrel 9 for retaining the barrel therein. The lower end ofthe barrel 9 is of reduced diameter to :tit Within the reduced inner end of the hole 8 and a. shoulder 12 is formed at the point Where the diameters of the barrel change,`

for resting upon the annularpledge' of the body hole 8; change dimension, so as"`to Irestrain portion Where the diameters of the the barrel from axial inovenientinthe body 7. l

` 'llheuaaeror relativel7 large ioi'tionof the barrel `9 is provided with a diamericallyI disposed slot .18 for slidably receiving a transversely `disposed. locking pin 14. which is normally urged upwardly by a helical conipression spring l5. The pin lll has an axial length slightly less than the diameter of the hole 8 and the opposite ends thereof protrude at each of the sleeve 10 being considerablyless than the depth of therelatively large portion of the hole 8 so that an annular space A16 is provided in which the protruding ends of the pin 14; may move.` Theinnei' end of 'the sleeve 10 is provided ivitha pairof f liametri; cally disposednotches `for reeeivingthe pro; trudiiig ends of the pin 1a when rotatedgin and urged theieinto by the spring lfor locking the barrel 9 against rotation relatively to the sleeve 10. `lhe sleeve 1() when finally assembled in the body 7 is die fit `or otherwise suitably secured to the body portion solas to preventrotation relatively thereto. j j

, The barrel 9 is also provided with a transversely disposed pin 18 rigidly mounted therein atright angles tothe slot 13 and in position to contact with the locking pin 14 Whensaid locking pin is in engagement lWith the notches 17 of the sleeve 10." j A key 19 `is provided for releasing the barn rel 9so that the same may rotate relatively to the sleeve 10. Said Vkeyis in a formof a relatively thin fiat elongated strip Ofinetal side of the barrel 9,the`y length K may be rotated.

i VTher inwardly disposedv annularflange 11 on the outer end of the sleeve 1() is provided With a pair of diametrically' disposed slots for allowing the insertion ot' the key 19, and a air of notches21 are formed in-opposite sides of the key and positioned so that when the key is inserted asuflicient distance to remove the locking pin 14 from its retaining Anotches 17 the notches 21 will be in registry with the inwardly turned annular flange 11,

thereby permittingk the key to be rotated relatively to the sleeve 10.

yThe lower or inner end of the barrel 9 carries a depending shank 22 which is slightly less thanv semi-circular in cross section. The

` lower end of the shank 22 )has an intevrally vformed head23 thereon which provi es an.

under-cut shoulder 24. Thecasing 1 is provided with an aperture 25 punched therethru which is of substantially the same shape as aplan ofthe head 24 to so that said head ,"thereth-ru for receiving the tip andV shank can *be passed therethru when turned toa certain position but which cannot be removed therefrom aiter being insertedtherein andthen turned to another position, the under cut shoulder 24 of the head 23 en aging the under surface of the casingl any preventing, such removal.

` The head end 5 of the handle 6 is provided with a finger 26`housedwithin the casing and which'is adapted to retract a bolt 27 mounted toA slide axially thru the lcasing 1. The

bolt '27 Vhas one end thereof of rectangular cross section and an aperture 28 extends end of the iin er 26. v fr 'he'upper surface of the boltadj acent the aperture 28 is notched out as shown at 29 for a depth suilicient to permit retraction of the bolt without contacting with thev end of the f 'finger 26. The outer end of the rectangular 4portion of the bolt 27 has a roller 30 jour- Cil naled therein in the usual manner for cooperating With a catch 31 rigidly mounted Y by screws or the like 32 to the door frame 33 of 'the article to 'which it is applied.

i' The lopposite yend of the bolt 27 is in the form of a round shank 34 which haszva stiif Vhelical compression spring 35 wound therearound. One end of the com ression spring 35 bears against the inner si e of the easing A1v and the other endthereof bears against the vrectangular portion of the bolt 27 as shown most' c early in Figs. 2 and 4.

Means are provided for preventing the retraction of the bolt 27 when the locking barrel has been turned so as to engage the shoulder 24 of the head 23 with the casing 1. Said means comprises a pawl 36 in a form of a bell crank pivoted at 37 on the under side of the casing 1. The other arm 38 of the bell crank extends out and is positioned closely adjacent to the head 23 and is normally urged to the position shown in Fig. 2 by a helical compression spring 39. \Vhen the head 23 has rotated a half revolution from the position shown in Fig. 2 it bears against the arm 38 and swings the bell crank on its pivot 37 so as to shift the paw] 36 toward the bolt 27 and swing the end of the pawl back of the shoulder 40.

In the operation of this latch when in an unlocked condition the handle 6 is grasped and raised upwardly causing the finger 26 to bear against the rear side of the aperture 28 and shift the bolt 27 against the action of the spring 35, which is to the right as viewed in Fig. 4 of the drawings. Upon release of the handle 6 the spring returns the bolt 27 to its normal locking position. If the door of the article to which this device is attached is slammed shut without regard to the handle 6 being raised, the bolt 27 is pushed to a retracted position by the roller 30 contacting with the inclined face of the catch 31 in the usual manner. Such retraction of the bolt however does not operate the handle 6 on account of the slot 29 in which the end of the finger 26 slides.

When it is desired to lock this device the key 19 is inserted into the slot 13 of the barrel 9 and pushed inwardly a sufficient distance to move the protruding ends of the locking pin 14 out of their respective notches 17, at the same time bringing thc notches 21 in the opposite sides of the key 19 into registry with the inturned flange 11 of the sleeve 10, thereby permitting the key 19 to be rotated relatively thereto. Rotation of the key 19 a halt revolution, rotates the barrel a half revolution thereby causing the undercut shoulder 24 of the head 23 to engage the underside of the marginal edge of the opening 25 in casing 1. Such rotation of the head also causes the arm 38 of the bell crank pawl 36 to be cammed on its pivot 37 a sufficient distance to move the pawl'36 back of the shoulder 4() thereby locking the bolt 27 against retraction.

Although but one specific embodiment of this invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without de arting from the spirit of this invention as defined Vby the following claims.

I claim:

1. A device of the class described comprising a casing, a bolt axially slidable on said casing, a handle pivoted on said casing for operating said bolt, loeiiing mechanism for preventing the operation of said handle, and a paivl actuated by said locking mechanism lor engaging said bolt to prevent the sliding movement thereof.` i

2. A device of the class described eom prising a casing, a bolt axially slidable on said casing, a shoulder on said bolt, a handle pivoted on said casing for retracting said bolt, locking mechanismior securing said handle to said casing to prevent pivotal n'ioviunent thereol", and a pavvl actuated by said locking' mechanism to engage said shoulder for preventing the retraction of said bolt when said handle is locked to said casing.

3. A device of the class described comprising a casing, a bolt axially slidable on said casing, a shoulder on said bolt, a handle pivoted on said casing for retracting said bolt, locking mechanism mounted on said handle for securing said handle to said casing to prevent pivotal movement thereof, and a paivl actuated by said locking mechanism to engage said shoulder :tor preventing the retraction of said bolt when said handle is locked to said casing.

Il. A device of the class described comprising a casing, a bolt axially slidable on said casing, yielding means for normally urging said bolt to one position, a handle for retracting said bolt, a lock for securing said handle in inoperative position, and a paivl actuated by said lock for preventing the retracting of said bolt When said handle is locked in inoperative position. y

5. A locking mechanism of the class de scribed comprising a barrel having a transverse slot therethru, a transversely disposed pin slidable in said slot axially of said baia rel, the opposite ends of said pin protruding beyond the sides of said barrel, a collar surrounding the outer end of said barrel, the inner end ot said collar having diametri cally opposed notches for receiving the pro truding ends of said pin, a compression spring bearing against said pin for normally urging said pin toward said collar, said barrel having an annular opening around the inner end of said collar for permitting said barrel to be rotated on :its axis relative to said collar when said pin is out of engagement with said notches.

G. A device of the class described comprising a casing, a bolt axially slidable on said casing, yielding means i'or normally urging said bolt to one iosition, a handle pivoted on said casing, a inger on said handle for engaging and retracting saidbolt against the `action of said yielding means, said bolt having an aperture therethru for receiving the end of said linger and a slot communicating With said aperture for permitting the end o'l' said finger to slide therein Without moving said handle.

In testimony whereof I have hereunto set my hand at Grand Rapids, Michigan, this 14th day of June, 1928.

ANDREW EKMAN.

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