US1970757A - Lock mechanism - Google Patents

Description

Aug. 21, 1934. A, Q LYQNSr 1,970,757

LOCK MECHANI SM Filed March 3, 1932 2 Sheets-Sheet l Q27 h if M7 13;"

ATrgRNEYs.

Aug. 21, 1934. A G, LYONS 1,970,757

LOCK MECHANISM Filed March 5, 1932 2 sheets-sheet 2 INVENTOR. ArTT-Lur [-3.1:3 m15 i A fated plugiof the cyl .y 45 possession of the oor y() designate the improve Patented Aug. 21, 1934 UNITED STATES PATENT OFFICE f Reading Hardware C a corporation VApplication March 3, 1 claim.`

` This invention relates to improvements in lock mechanisms.

Thel primary object of this inventionis the provision of an improved lock mechanism forV guest room corridor doors-having a dead bolt and a latch bolt, both of which may be operated by an emergency key from the corridor; the oor-maids key and guest key being constructed so that they may only actuate the latch bolt when the 4dead bolt is retracted.

Other objects and advantages of this invention `will be apparent during the course of the following detailed description.

In .the accompanying drawings, forming a part of this specification, and wherein similar reference characters designate corresponding parts throughout the several views, Y

.I Figure lis a fragmentary View, partly in section, showing the lock mechanism with bot-h the ead `and latch bolts in locking positions, and showing. that the guest key and oor-maids key `undersuch circumstances are inoperative to retract either ofthe bolts from the corridor side of the door. i, VFigure 2.is a vie wshowing ,the lock parts of Figure 1, butwith the bolts retracted, and showing the: manner in lock ,may actuate same. 4 Figures 3 and 4 are cros .respectively on their re and 3cr the drawings.

Figure 5 is ca. view of proved lock showing the l a portion of the emerge flockand in position tov st y.dead bolt.V Y ,Figure 6 isa perspective view of the key actuinder lock.vv `i-Figure '7 is a sectional view similar to Figure 1.4, but showing the emergency key inl the plug of thel cylinder lock.

' Figure 8 shows the type of key which is in the y -maid and guest.

Figure 9 'shows the emergency key. In the drawings, whereinfor the purpose of `illustration is shown only a preferredembodiment of the invention, the letter A may generally which the throw-back. of the the latch bolt to retract the s sectional views taken spective lines in Figures 1 the details of the imatch bolt extended and ncy key in the cylinder art the projection of the orporation, Reading, Pa.,

1932, serial No. 596,621 (cx. .7o-29) actuated to this end by means of an emergency key F and a guest and maids key IG.

The lock case B may include a face plate 10, opposite side walls and 16, and marginal boundary walls 17. Of course the structural features and nature of the case B may Vary widely, although in the mainit will be of the mortise type.

fThe dead bolt mechanism C includes a reciprocating lframe mounted in the lock case, and having the dead bolt proper 21 aixed therewith. Suitable means are of course provided in the case to guide the movement of the frame 20. A tumbler 22 is pivotally carried at 23 by the dead bot frame 20, being spring urged at 24 so that its cam engaging shelf 25a is in normal 4position to be engaged by the cam 25 of the cylinder lock'E. A fence 27 is carried bythe case B against which a portion 280i the tumbler 22 engages to lock the dead bolt 21 in retracted or projected position,

as is shown in Figures 1 and 2 ofthe drawings. A spring actuated lever 30 is pivoted on the dead bolt frame 20, the same having a heel 31 which forms the forward part of the cam engaging Vthroat of the lock; the bolt frame 20 itself having 'a rear heel 32." These parts are more particularly described in Patent #1,678,994, July 31, 1928, 'and their operation will be well understood.

Since in this lock mechanism both the dead bolt and latch bolt are adapted to be actuated by the cam or rollback 25, the latch mechanism is substantially the same as that set forth in the patent above mentioned. The latch bolt mechanism D includes the latch bolt proper 35 upon the fore end of a slidable stem or frame 36; a spring 37 normally actuating the latch boit proper 35 into a"shot position. The latch bolt mechanism further includes a lever 38 pivoted at 39 upon the dead bolt frame 20, and engageable at its free end with a shoulder or cross head 40l on the frame `of the latch bolt mechanism. This lever has Va, lug 42 near its pivoted end engageable by a movable end of a cam actuated lever 44, which is pivoted on the dead bolt frame at 45.

If desired, the tumbler 22 may be of a type actuated by a thumb piece at the inside of the door, under control of the guest, in order to throw the bolt mechanism without the use of the key. However, in the drawings the dead and latch bolts are shown as solely actuated by the keys.

The operation of the dead and latch bolts will be understood from the foregoing. If both the deadand latch bolts are projected in locking posi- Figure 1, it will be necessary to tion, asrshown in Vthrow the cam 25 from the position shown in Vdisposed inwardly of casing 50.

Figure 1 to the position shown in Figure 2 for complete retraction of both the dead and latch bolts. This movement of the cam 25 takes placev through substantially one complete turn of the cylinder lock plug, as can well be understood. Of course the dead bolt is retracted first, and subsequently rwhen the dead bolt frame has been moved to position the cam engaging end oi the lever 44 in the path'of the cam 25 the said lever 44 is depressed, as shown in Figure 2, to retract the latch bolt.

With the general features of the bolt mechanism as above described it is the principalobject of this invention to enable either the guest or maid from the corridor side of the door tothrow the cam 25 in order to retract the latch bolt when the dead bolt is retracted. This is effected by limiting the angular movementv ofthe vcaml25, suiiicient only to retract the latch bolt proper 35 when the dead bolt proper 21 is in a retracted position. Y

Referring tofeatures of the cylinder lock E the same includes `a cylindrical shaped casing 50 which is externally screw threaded for connection in the walls 15 or 16 of the oase Bin usual manner. This casing 50 is provided with an eccentric circular bore 51 vtherethrough' wit-hin which the usual cylindrical shaped plug 52 is rotatably mounted. n The plug 52 is provided at its outer end with the annular ange 53 which -seats in a countersunk relation in the face oi the casing'50, as shown in Figure 3. The end of the plug 52 which projects beyond the inner end of the casing 56 is provided with a diametrically disposedshank 55 which fitsinto the slotted end of the-cam 25; the latter being held in place upon the inner end ofthe plug 52 by means or" screws 56 which detachably connect in suitable screw threaded openings 57 on the inner end of the plug. This arrangement assembles the plug in place in the cylinder casing 50. The plug 52 is provided vwith the key shank receiving slot 60 therealong, and conventional pin tumbler mechanism 62 is provided in proper association with the casing 50 and plug 52 in order to control rotation of the plug 52, and consequently ang-ular-v movement of the can125.

The plug 52 adjacent to its outer end is provided with an annular groove 65. The cas-ing 56y is provided with oppositely disposed members 66 and 67, which in the form of invention illustrated are screws, threaded iordetachable seating screw threaded passageways 68 and 69 respectively provided in the casing. 50. These screws when. properly seated in their openings 6.8v and 69 have the keried head ends thereof the outer surface of the Their inner ends are respectively provided with semispherical projections 70l and 71 which areA in positionto extend into the bore 51 of the casing 50, and more particularly into `the groove of the plug 52 so as to interpose obstructions to an ordinary key inserted into the key slot 6in 'Ihe key F includes a shank 70 having the upper edge 7l thereof providedv with indentations 72 into: which. the pin tumblerss of. the cylinder lock 50 t in a relationy which will enable the plug 521v to be. rotatedby the key F, in a manner which isperiectlyf apparent. Itwill be noted that the shank170-asythekey is slid into place,` intersects the annular-groove 65 of the plug 52. For the key F the opposite edge 73 is provided with `a notch or indentation 74 which,. when ythe* key is fully in place inthe` cylinder lock. lies iiush with the groove 65 so that as the plug 52 is rotated by the key F the key shank will not prove to be an obstruction against the ends and 71 of the pins 66 and 67. Thus with the key F one is able to complete the rotation of the plug 52 for operating the cam 25 of the cylinder lock against the tumbler 22 of the dead bolt ymechanism C, and also against the operating lever 44 of the latch bolt mechanism D, so that the dead bolt and latch bolt may be projected or retracted by the key F.

vThe key G is of identically the same construction asA the key F except for the fact that no notch is provided inwardly of the rear edge 73a thereof. Thus, 4during rotation of the plug 52,

with the key G in the slot, the back of the shank of the key `G will' hit against the projecting ends 7i) kandlV of Athe cylinder lock pins 66 and 67, limiting the angularity of movement of the plug 52 sothat it will be totally impossible to operate the tumbler 42v as is clearly shown inFigure 1 'of the drawings. In fact' the `latch'bolt Dmay only be operated when the dead bolt C 'isl retracted, sincethen the operating end' oi'V the lever 44 will lie in position'to be engaged by the cam 25 at a time immediately prior to the time that-the shank of the keyG hits against the pin end 71, as can be understood from Figures land 2 of the drawings. This interposition of the shank of the key G across the groove 65 is well shown in Figure 4 of the drawings, and in con? tradistinction thel alignment of -the notch-74 `with the groove 65 is shown in Figurel 7 ofthe drawings. i

l It is to be understood that the maidskeyand the guest key are identically the same as shown for the' key G in Figure 8 of the drawings. The corridor side of the door would have 4a rigid knob so that lthere would be no lock operation by means of the knob. If the guest is out of his or her room it is vquite apparent that the Adead bolt will' be retracted and of course the noormaid with her key G may enter the room because in this position of the lock the dead' bolt is retracted and the latch bolt parts are impositionto be operated and retracted by means of the maids;Y key. When the guest enters from the `corridor' side of his door to his room, andgfor of thef manager or owner of the hotel who can at all times unlock the guests door. This is sometimes necessaryY in event the guestbecomes ill in his or her room andv is unable to arise' in' The key F can also order to' unlock the door. be used. by the management inV order to lock the door from the corridor side, thus preventing the guest from entering. his or her room. without consulting the manager. Y

Various changes in the shape, size, and arrangement' ofv parts may be made to the form of invention herein shown and described, without departing from the spirit of the invention or the scope of the claim.

I claim:

The combination with a mortise lock mechanism having a latch bolt and an operating member therefor. a dead bolt and an operating member therefor, a cylinder lock including a casing, a. rotaryxfplug mountedin thee-easing having a assuredof' privacy. The emergency key F is of courseA under control lock operating cam for engaging with said operating members, pin tumbler means normally in position to lock said plug against rotation in said casing, said plug having a key slot therein for receiving the shanks of master and other keys, said plug having a continuous groove thereabout, a stop projection xed on the casing of the cylindeiand projecting into said groove so as to lie directly in the path of a predetermined type of key other than the master key to limit the angular rotary movement of the plug in the casing, said stop projection being so positioned relative to the operating member of the latch ARTHUR G. LYONS.

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