US2254007A - Lock - Google Patents

Description

1941- I. J. FLETCHER 2,254,007

LOCK

Filed March 26, 1940 Patented Aug. 26, 1941 LOCK 7 Irving J. Fletcher, New Britain, Conn., assignor to The American Hardware Corporation,

New

Britain, Cnn., a corporation of Connecticut Application March 26, 1940, Serial No. 325,945

4 Claims.

My invention relates to the class of devices which are employed for securing doors as closures for various structures against unlawful entry, and an object of my invention, among others, is the construction of a lock that shall be suificiently strong to resist the methods commonly employed for breaking into structures for petty piliering.

Forms of locks embodying my invention and in the construction and use of which the objects herein set out, as well as others, may be attained are illustrated in the accompanying drawing, in which- Figure 1 is a face view of a portion of a metal door and door jamb having my improved lock secured thereto.

Figure 2 is a view in horizontal section through the same.

Figure 3 is a View from a point at right angles to the point of view of Fig, 1.

Figure i is a view on enlarged scale in section through the lock on a plane passing through the axis of the lock cylinder, the latter, however, being shown in full.

Figure 5 is a view in section on a plane denoted-by the broken line 5-5 of Fig. 4.

. Figure '6 is a similar view on a plane denoted by the broken line 66 of Fig. 4.

Figure 7 is an isometric view of the lock parts separated but in'their relative positions to be moved together for assembly.

Figure 8 is a face view of a portion of a door and of the lock showing a modification. 1

Figure 9 is an edge view of the same.

Figure 10 is a view in section on a plane olenoted by the broken line l0.l0 of Fig. 2.

Figure 11 is a View in section on a plane denoted by the broken line I of Fig. 10.

Figure 12 is a view illustrating a modified form of the invention as to the connection with the latch bolt.

A source of annoyance and loss results from cases of petty pilfering from trucks and similar vehicles for transporting merchandise, and especially trucks used for express purposes. These are commonly constructed of metal with latch bolt operating handles of horn shape and the lock structures in common use are of such character and the connection between the handles and the latch bolts is rigid so that entrance is readily gained by breaking the look by means of the handle on account of the leverage obtained by the handle. It is the purpose of the present invention to construct a lock of this type sulfiby the means related, such lock being shown in i the accompanying drawing in which the numeral ciently strong to resist efiorts to break it open I0 denotes a portion of a door, as of a truck or other structure, and II the jamb thereof, which parts are commonly composed of metal in various forms. 'An opening in the edge of the door for a lock structure contains a shell I2 through which the connection from thelock to the .latch bolt I3 extends, the latter engaging behind a striker [3' on the door jamb, or of an opening therein, to secure the door in closed position as shownin Fig. 2.

An escutcheon I4 is secured to the front face of thevdoor as by means of screws l5 threaded into the ends of rods [6 extending through to the opposite or back face of the door where they are secured in any suitable manner, not .shown herein. The escutcheon has a locking lip' ll projecting outwardly from one edge with a recess I8 therein for one end of a lock bolt. A handle [9 including a head 20 is secured to the escutcheon in a manner to be presently described. Said head has a recess 2| opening from its front side with a hole 22 extending from said recess into ahole 23 for a lock bolt,,the latter hole opening into a recess 24 cut into the backside of the head for the receptionof the head 25 of a latch bolt spindle 26, as shown in Fig.4 of the drawing. A lock cylinder 21 is secured in the recess 2| as by means of screws 28 extending into the cylinder from the back of the head, as shown in Figs. 4 and 7. A plug or barrel 29 of the ordinary pin tumbler or other type is .secured in the cylinder in a manner common to structures of thissort, a stud 30 on the end of the plug engaging in a slot in a locking bolt 3| as shown in Fig.4. Operation of the plug 'by turning a key in the usual manner will engage the lock bolt in the recess l8 or in a locking recess 32 in the head 25 of the latch bolt spindle. In this movement the bolt 3| simultaneously engages both of said recesses so that turning of the handle will not place the locking bolt out of alignment with the recess 32. This spindle is secured to the head 20 of the handle by a fastening plate 33 secured within a recess in the head by means of screws as shown in Fig. 7, two of these screws being the screws 28 hereinbefore referred to for securing the cylinder 21 in place. The head 25 of the latch bolt spindle is larger than its stem, thereby creatmg a shoulder against which the plate 33 rests, thereby securing the spindle to the head 20 just ment1oned. A spring 34 surroundingthe spindle within an opening in the door I0 is secured between two washers, the latter being held by'a pin 35 extending through the spindle, thereby creating a slight resilient anchorage for the head 20 and handle 19. The spindle 26 is squared at its inner end and is engageable in a square hole in a rollback 31 including a tongue 38 engageable With a lug 39 on the latch bolt l3 as shown in Fig. 10. To operate the latch bolt from the inside a handle 40 engageable with a shoulder 41 on the latch bolt is employed to retract the bolt, a spring 42 operating to engage said bolt with its keeper l3. With the modified form of structure shown in Fig. 12 the tongue 38 on the rollback has a lug 43 engaged in a groove 44 in the latch bolt 45 and the handle 49 operates against a shoulder 46 at one end of a recess in the latch bolt. With this form of inside latch bolt operating mechanism the latch bolt operates independently of the head 20 and the handle is by reason of the free connection between the head 25 of the spindle 26 and the head 20 of the handle, whereas in the form first described the latch bolt operates independently of all of the other parts of the mechanism.

From this description and illustration it will be readily seen that the handle I9 is rigidly held against turning movement by engagement of the lock bolt 31 with the escutcheon Hi and therefore no strain placed upon the handle Will be communicated to the latch bolt or its spindle. When it is desired to open the door a key is employed in the plug 29 in the usual manner, rotation of the plug disengaging the bolt 3| from the escutcheon and entering it into the recess 32 in the head of the spindle, thereby connecting the handle with the spindle and communicating turning movement thereof to the latch bolt [3 to. release the latter from its retaining member or keeper.

The modified, form shown in Figs. 8 and 9. is the same ashereinbefore described with the exception that lips 36 are formed on the head 20 of the handle to overlie the heads of the screws l5 and prevent access thereto when the mechanism is in. locked condition.

In accordance with the provisions of the patent statutes I have described the principles of operation of my invention, together with the device which I now consider to represent the best embodiment thereof; but I desire to have it understood that, the device shown is only illustrative and, that the. invention may be carried out by other means and. applied to uses other than those above set out.

I claim:

1. A look including anv escutcheon in the form of a flat plate with a hole therein and a thick lip on one side having a recess to receive a locking bolt and thereby resist turning movement of a handle, a handle rotatably mounted on said plate having an edge adjacent said lip and having a recess registering with said hole, a latch bolt operating spindle projecting into said recess and having a locking recess in its side, a lock bolt located in a hole extending between the recess in the handle and the outer edge thereof and engageable simultaneously with the locking recesses in both said spindle and lip while being moved from the looking to the unlocking positions, and means for operating said locking bolt.

2. A lock including an escutcheon in the form of a fiat plate having a hole therein and a thick lip on one side having a recess to receive a locking bolt and thereby resist turning movement of a handle, a handle rotatably mounted on said flat plate against said lip and having a recess registering with said hole, a latch bolt operating spindle having an enlarged head projecting into the recess in the handle and having a locking recess in the side of the head, a plate secured to the handle and having a hole therethrough, the

edges of which engage with the shoulder formed cess in its under surface, a latch bolt operating spindle having one end extending into said recess in said handle and having a recess in its side, a locking bolt carried by said. handle, and means for operating said locking bolt, for releasably securing said handle to said spindle for op-' eration of the latch bolt and also while being moved from locking to unlocking positionsv to simultaneously engage the bolt with the recess in the spindle and with the recess in, the lip on the support and thereafter to release the bolt from the lip on the support.

4. A look including a lipped support having. a flat bearing surface for a handle, a handle rotatably mounted on said support and having aflat bearing surface seated against that on the support, a latch boltv operating. spindle having one end entering into a. recess in the under surface of the handle, a locking bolt carried by said handle and engageable with said support to secure the handle against rotation thereon and also simultaneously engageable while being moved from locking to unlocking positions in a recess within said spindle. torotate the latter, and means for operating said bolt.

IRVING J. FLETCHER.

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