US1867244A - Lock - Google Patents

Description

July 12, 1932. ANDREWS I 1,867,244

LOCK

Filed 001;. 14, 1930 2? 1& Pa

//vve- To B Patented July 12, 12932 stares ime-1 rn nnr-nronnenonn ANDREWS, or TAIEAPE? new ZEALAND, ASSIGNOR ro BROOKS, orwnnnmeron, znnnnnn I v 7 Applicatien filed Octoberll, 193a. Seria1 1q'o.88,613.

This invention relates to locks for door-s and tlie -likeand' particularly to that type of lock in which a bolt is given a reciprocating niovenient by means of a key adapted to engage-within anextended portion in which an: opening" is formed, and having inclined top'and'lower edges against which the key engagesforinoving the bolt.

The-object of the present invention is to add I greater securityto such locks andat the same time to reduce the cost of manufacture thereof. a

iiccording to the present invention levers pivoted on pinsin their casing have their 'rea-r ends ex -tended to traverse the curve'd'or V inclined edges I of the opening and their for-- ward ends en gaging-thetailsof locking pawls also pivoted on pins in the casing and adapted .to-be brought together by'a' spring so that their tront'en'ds will engage behind a shoulder on thebolt' and normally retain the bolt in-its locked 'or shot position As the rear ends-'o'Pt-helevers are 'operaited' by the key,

their front ends will depress-'thelocking pawls "andihrin them out of'engagernent'with the bolt'tlie-reoy permitting'the bolt to return to its retracted position when the key engages ani'nclined edge of the opening.

The levers have extensions, one of which 'has'a pin passing in the slot of the other en'- tension so that'if one lever is operated by the key the opposite lever will also be opened. The invention will now be described with the aid of the accompanying drawing, where- Figure 1 is aview of th'el'ock with the cover of the casingrerhoved, and the locking boltin its retracted position Figure 2 7 in a=shotor locked position. In this view for simplicity the latch is not included} 'Figure'?) isa cross section along line33 Figure 2. V

Referring to-the drawing; the usual locking; bolt 1 is provided with its extended plate 2 having an opening 3 therein. The upper and lower edges of the opening have respectively inclined or curved edges 4 and 5 a ainst which the key will be adapted to; strike for the purpose of placing the bolt in a shot or reis a similar view showingthe bolt.

tracted: position. The; sliding rnovement of the bolt islirnited by'a pin'G fiXe'd to the'casin' and passing through: a slot 7 in the plate' Levers S and 9 pivoted on pins 10 and ll respectively have theirfrespective 'rear ends 12 3 and 13 extending across theinclined edges 4: and 5 of the plate 2.; The frontjends; 14 and 15 of the levers 8 and'9 bear uponthe' tails-16' and 17 of thepawls'18 and 19 pivoted" on pins. 20 and 21 respectively and have-theirfront ends 22 and 23Ibearing. upon the side of the bolt 1. A coilspring 24 connects these two pawls and normally retainsthe levers" 8 and9 in an inward position as in Figure'l, Ar1ns26 and 27'resp'ectivelyon the levers 8 and 9 are connected 'by a 'p in 28 on the arinr 27 passing through a slot'29 o-fthe'arni 26 so that IIIlOVQITlGHtS of one lever are. transmitted to the other lever. V V v The key hole 30 has two pivot holes, one each end, so that when the'key'fal is insert- 7 ed in position in the upperpivot hole and rotated to the positionshownlin,Figure- 1,

the end 12 of the lever 8 will 'enter the slot 32.073 the key and, as .thelr'evis continued to be rotated, its outer edge will strike the.

curved edge at. of the opening 3. shoot the bolt forward in the usual manner to the position shown in Figure 2. Irnmedifatelyi this occurs the levers 18 an'dl9 being 'd'rawni towards each other by the spring 24, Will cause the front ends 22 and23 to engage behindthe shoulder 38 ofitheboltjL thereby locking the bolt? in its shot position.

To bring the bolt .to' its retracted" position, the kev, .being 1n the position'shown in Figure '2, may now beturned in; the opposite; direce V ,tionuntil. the slots 32 of the hey again en gageithe end 12 or the'leverS, pushing'the lever back to the'position' shown in dotted lines 1 in Figure 2; which corresponds" to the position sh'ownlin' Figure 1, and" depressing the paw-ls '18 and '19; thereby disengagingth e front'end 22 and 23 froni the shoulderpt the bolt. ,By continu-edrotation theouter" edge of the keywill strike thecurvedfedge 1 andreturn -the b oltirto its retractedposition, as shown in nigureqll Similarly, the key is insertedintlle lowerprvo'tihole; it would operatei the lever- 135i'1ras1mr1ar manner, and the movements being transmitted to the opposite lever bymeansof the arms 26 and 27. a I

A latch member 40 has a spindle 41 on which is located a vcoil spring 42 in compression between the head of the member and a guide stop 43 fixed to the casing, the rod being extended and having a downwardly depending end 44 operable'from the latch spindle 50. 7

- The lever 8 is shown with a slot. 45 into which-projects a pin 46 from the plate 2. In

the position shown in Figure 1 the pin lies ina notch 47 so that the bolt cannot be shot until the lever 8" is disengaged. When the position shown in Figure 2 is reached the pin enters a notch 48 which will prevent the bolt beingretracted even although the pawls 18 and 19 are clear of the bolt. A further notch 49 from the slot 45 will engage the pin 4'6 shouldthe lever be raised beyond the redifferent key is required to correspond to.

'qui'red position; thus, 'shouldany'keybe used that will raise the lever 8 so that the notch 49 engages thepin 46 the bolt cannot, belretracted.

The opening 3'can be varied and also the width and thickness ofthe levers so that a each variation of lock/ Thus, if the levers .S'and 9 extend slightly more or less over the opening? then a key with a different i depth of slot would be required, or the thick- 'thebolt.

"the required amount by a key of the correct depth any variation of the notch 48 prevents the lock being operated except by a key made ness of the leversimay be varied, in which case the width of the key slot is also varied. 7 If the lever. 8 above is used without the pawls 18 and 19, then the slot 45-a-nd pin 46' will, provided thelever is under the tension of a spring, give an effective looking to Since the lever 8 must be raised for the particular variation. This arrangement makes the lock very difiicult to pick since the lever must be lifted exactly clear of the notches 48 and 49 before the bolt can be retracted.

hat I claim is g p 1. A lock including a casing, a locking bolt, a plate from said locking bolt having key contacting edges, levers pivoted to said casing and traversing the key. contactingedges of said plate in order to be actuated. by the key, spring operated pawls pivoted to said'casing one upon each, side of said locking bolt and normally resting thereon and conhasjbeen shot'said pawls will under their spring 'tension engage and retain said lock-- ing bolt in its shot position.

2. In the lock as claimed in claim 1, le-

vers pivoted on pins projecting from the v lockica'sing, the rear end of said levers traversing the opening in said'plate, the front end 7 j ofjsaid levers bearing upon the rear ends of,

said spring operated pawls, said levers ari edges of said plate in order to be actuated by the key, said lever havingits front end 7 formed soas to pass over said locking bolt and having a slot formed in its front end, a pin fixed to said locking bolt and passing through the slot at the front end of said lever, the rear end of said lever having a slot with a notch forming part of the slot, a pin projecting from said 7 plate) and passing the said pin on the'plate adapted to engage through the slot in the rear end of said lever, 3 V

the notch when the bolt is in its shot position thereby retaining it in that position, and

spring means controlling said lever to retain it 111 engagement on said pin.

7 w I 4. In the lock as claimed in clai'm3, the.

rear end of the said lever containing the slot 1 formed with a further notch from the slot whereby shouldthe said lever .be operatedbeyond the required position bythe key the said pin will engage. the notch and prevent further movement of thelever and the looking bolt, V

5 In the lock as claimed in claiin 1, a coil sprlng attached to the said pawls todrawsaid pawls in engagement with the locking bolt and also retain said levers in their normal.

position acrossthe key contacting edgeseof the plate from said locking bolt.

6. A look including a casing, a lockingv bolt, a plate from said locking bolt having key contacting edges, a leverpivoted to said caslng and traversing the .key contacting edges of said plate in order to be actuated by the key, a pawl pivoted to saidcasing and normally resting upon the side of the locking bolt, a shoulder on said locking bolt. an end. of 521d pawl adapted to engage said shoul-' der when the bolt is in its shot position, a

spring normally to hold'the said pawl in. engagement with said shoulder, the other end of said pawl engaged bythe end of said lever I wh ch when moved by the contact of the key said pawl is disengaged from said shoulder and the bolt enabled to be moved to a retracted position. trolled by the said levers, but when sald bolt I ln-tes'timony whereof I havesigned my 7 name to this specification.

FREDERICK HAROLD ANDREWS.

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