Schlage Cylindrical Locks: Keying Wafer Locks

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The Sc hla ge w a fe r ke yw ay u ni t, a ft e r ye ar s o f res ea rch an d de ve lo pm en t, wa s fir st m ar ke te d in 19 2 7 . Eleve n hu nd re d an d tw e n ty s toc k keys can be c om bi na te d in this ke yw ay a nd fo u r hu nd re d an d ei gh ty d if fe re n t ch an ge s ar e po ss ibl e w ith a sin gle m as te r ke y. It can als o be g ra n d m as te r ke ye d.

D IS A S S E M B L IN G

A N D

R E M O V IN G

K EYW A Y

S te p 1 De pre ss ca tch (A 1) th ro ug h the ho le in the sh an k o f ins ide kn ob (A) w ith a sc re w dr iv er to re lea se in sid e kn ob fr o m sp in dl e (E).

S te p 2 W it h kn ob re m ov ed , po si tio n sc re w dr iv er in to sm all

not ch (B I) us ua lly lo ca te d on the bo tt om ed ge o f in ­ sid e ro se tte (B) a n d , w ith pr yi n g m ot io n, sn ap o ff the in sid e ro se tte .

S te p 3

Rem ove the t w o m ac hin e scr ew s (C) a nd in sid e m ou nt ­ ing p la te (D) w il l sl ip o ff ov er th e in sid e sp in dl e (E). The loc k w ill no w sl ip o ut o f ho le.

Co py rig ht 195 9 by Sc hla ge Lock Co mp an y, Form No . 755 Lit ho gr ap he d in U .S .A

The loc k ho us ing (F) is a tt a c h e d to th e loc k b y sm all c ot te r pin (G ) or by tw is te d lug s. Rem ove co tt e r pin (G ) or st ra ig ht en ou t the lug s. Lif t ho us ing a b o ve lug s a n d , w ith sl ig ht tu rn , ro ta te ho us ing (F) V4 inc h an d re m ov e. W it h ho us ing re m ov ed , the loc k fr a m e is no w e x ­ po se d. H ol d loc k in bo th ha nd s, po si tio ni n g fin ge rs as sh ow n in ill u st ra ti o n . (W he n p e rf o rm in g thi s o p e ra ­ tio n, ho ld pa lm s o f ha nd s c a re fu ll y a ro u n d lo ck to p re ­ ve nt sp rin gs fr o m es ca pi ng the re tr a c to r sl id e. ) To re ­ mo ve th ru st p la te (I), pres s fo rw a rd w ith th um bs ag a in st fr a m e ta bs ( H l) , push u p w a rd w ith in d e x fin ge rs ag a in st t hr us t p la te . This w il l d is en ga ge p la te . In o rd e r to fr e e the pl u n g e r un it (L) as yo u re m ov e as se m bl y, it is ne ce ss ary to push the sli de (J) a ll w a y to the re ar a g ai ns t the co m pr es sio n o f the sli de sp rin gs (K) an d ho ld do w n on th e sl id e w ith th um b.

this the tw o th e

A ft e r the ins ide sp in dl e (E), t hr us t p la te (I), an d p lu n g ­ er as se m bl y (L) ha ve be en re m ov ed , le t the sl id e (J) an d tw o sl id e sp rin gs (K) eas e fo rw a rd g ra d u a ll y a nd re m ov e the m fr o m the loc k fr a m e (H). To re m ov e w a fe r ke yw ay un it (N ) fr o m lo ck , push in on fa ce o f the w a fe r ke yw ay un it fr o m th e ou ts id e kn ob (M ). Un it w il l the n sli de in w a rd , w he re it ca n be re m ov ed fr o m th e kn ob as se m bl y. To fa c il it a te re as se m bl y, re m ov e ou ts id e kn ob (M) fr o m loc k fr a m e by ro ta ti n g kn ob 3A o f a tu rn w h ile p u lli n g ou t.

THE W AFER

K E Y W A Y U N IT

D e s c r ip tio n a n d T e r m in o lo g y In wo rk in g wi th the w a fe r ke yw ay un it, ho ld it in the le ft han d w ith th e “ V ” g ro ov ed di vi di ng str ip (N 1) fa ci ng y ou . In this po sit ion , t he sp rin g com b is on th e un de rne ath side a nd ca nn ot be seen. The pro tru sio n at th e ex tre me le ft is the k ey wa y ca m (N 2). The mos t com mon fo rm o f this ca m is illu st ra te d be lo w. To th e rig ht is the plu ng er sp rin g (N 3) . N ex t to this is the ke yw ay f ra m e (N4 ) wh ich inc lude s the e nti re steel ar ea fro m the plu ng er s pri ng to the fin ish ed ca p o f the ke yw ay uni t. In th is steel fra m ew or k are lo ca ted th e w af er s w hic h are ac tiv at ed by the ins erti on o f the key. The fir st colu mn (N 5) to the rig ht o f the plu ng er s pr ing , co nta ini ng t wo slots is the loc ati on o f the ma ste r w a fe r. No tic e th at t he slots in this colu mn have a di ffe re nt p ro po rti on th an do the rest o f the colum ns in th e ke yw ay f ra m e. In the rem ain ing c olum ns, the to p slo t is sh ort er tha n the bo tto m slot in this pa rt ic ul ar uni t. In some units , t he re lat ion sh ip o f t hese slots is rev ers ed, the long on to p an d the sho rt on bo tto m. On the reve rse side o f the ke yw ay u nit, not ice th at the re is a me tal sp rin g rac k (N6 ) ill us tra te d be lo w, wh ich look s like a com b an d upo n wh ich ar e sea ted the w a fe r spr ing s (N 7) .

4

W AFERS To mor e ea sily re co gn ize the thr ee typ es o f wa fe rs , alw ay s ar ra ng e them so t ha t the small pro tru sio n is u pw ar d an d the op en ing is to the rig ht. No tic e th at each o f the thr ee typ es has a de fin ite sil ho ue tte . The ma ster w a fe r (N5 ) has a notch cut ou t a t the base o f the pro tru sio n just ins ide o f the spr ing seat . The co mb ina tio n w a fe r (N8 ) has a pro tru sio n on th e rou nd ed s ho uld er op po sit e the spr ing seat loc ati on . The series w a fe r (N9 ) has th e pro tru sio n at th e to p o f the w a fe r, close to the spr ing sea t bu t does not have th e sma ll not ch, as does t he ma ster w a fe r (N 5). Each o f these wa fe rs pe rfo rm s in a di ffe re nt m ann er an d it is mo st im po rta nt to rec og niz e each ty pe be fo re it is in ser ted in th e ke yw ay u nit.

O P E R A T IO N

OF THE

M ASTER A -5 O 5 8

C O M B IN A T IO N A -S O 6 O

S E R IE S A -S O 5 9

K E Y W A Y U N IT

Here are tw o w a fe r ke yw ay units set to the same co m bin at ion . Figu re 1 is in the re la xe d pos ition or wit h the key o ut o f the ke yw ay . Figu re 2 has th e pr op er ke y in se rte d. No tic e in F igure 1, the re are f ou r pro tru sio ns o f th e w af er s, on e a t the bo tto m an d thr ee at th e to p. The fi rs t pro tru sio n to the rig ht o f the plu ng er s pri ng (N 3) is t he ma ster w a fe r (N 5). This re main s out ex ce pt whe n it is re tra cte d by th e uncu t po rti on o f the tip o f the key , w hic h is de sig na ted in red . The cut po rti on o f the tip is n eces sary to a llo w fu ll ins erti on o f th e key int o the ke yw ay . The thr ee pro tru sio ns (N9 ) at the to p o f the ke yw ay a re the series w af er s. W he n the key is ins ert ed , the uncu t po rtio n op po sit e the pro tru sio n (in dic ate d in red) acts upo n the series w af er s t o pul l th em in to the ke yw ay . The rem ain ing fo ur w af er s (N 8) in th e ke yw ay are co mb ina tio n wa fe rs . Both in the re lax ed pos itio n (Figu re 1) an d wi th the key inse rted (Figu re 2), these wa fe rs lie wi thi n the conf ines o f the ke yw ay uni t. Th er efo re , cuts on the key ad ja ce nt to th ei r pro tru sio n are re qu ire d to pre ve nt them fro m be ing push ed out i nto th e loc kin g po sit ion . An im pr op er key w ill fa il to d ra w b ack all the pro trus ion s o f the ma ster and series wa fe rs an d wi ll ex ten d some or all o f the pr o tr u ­ sions on the co mb ina tio n wa fe rs . 5

TYPES

OF

K E Y W A Y U N IT S

Schlage w af er key way units are made in t wo d istin ct types , typ e 1 and t yp e 2. To dis tingui sh betwe en these tw o types , look firs t a t the master w af er column. In t ype 1 the elo nga ted slot wi ll be at t he top . Type 2 key way has the elo nga ted slot of the master w af er column bel ow the " V ” gr oov e.

TYPES

OF KEYS

As there are dif fer en t types of keyw ays, there a re also dif fe re nt types of keys. These can be re cog nize d b y lo okin g a t the tip to see which por tion abo ve or be low the “ V ” gro ove has been cut aw ay when t he key is orien ted with the “ V ” groo ve poin ting aw ay from you. If the port ion abo ve the “ V ” groo ve has been cut aw ay , this is a typ e 1 key. If the por tion bel ow the “ V ” groo ve has been cut aw ay i t is a typ e 2 key. If the tip is uncut it is a typ e “ 0 ” key, usuall y used as a master or g ran d master key.

6

T Y P E "O " 92O A

K E Y W A Y C O D IN G As exp lain ed be for e, the firs t column to the righ t of the plu nge r spr ing is the m aster w af er column. Its p ro ­ port ions give a clue as to the typ e of key way with which we are de ali ng . In illu stra tion < A = a t righ t, you notice the long er sl ot is be low the " V = gr oov ed d iv id ­ ing stri p, ind ica ting a typ e # 2 key way . The 14 slots t o the righ t o f the master wa fe r column are assigned code numbers corr esp ond ing to the place men t o f the com bina tion wa fer s (N8 ). The fi rst slot to the righ t of the master w af er column and lo­ cate d ab ove the d ivid ing s trip is given the des igna tion code # 1 .

Al l fa cto ry cut keys have a com bina tion numbe r stam ped on t he bow wh ich indica tes the notchi ng on the key.

203823

The slot dir ec tly bel ow this is given the desi gna tion code # 2 . The c ode numbers alte rna te betwe en od d and even, contin uing to the righ t of the key way . All odd numbers are on to p— 1, 3, 5, 7, 9 and the last two numbers are 1' and 3' (read as 1 prime and 3 prime) . Al l the even num bers are loc ate d bel ow the d i­ vid ing str ip— 2, 4, 6, 8, 0—2 ' 4' .

In illust rati on < B= at the rig ht, t he key c arr ied the num ­ ber 20 38 23 . The firs t di gi t indica tes a typ e # 2 key with its tip cut aw ay , as exp lain ed on pag e 6. The second di git , in this case 0 , indica tes a stock key not rela ted to a ny ma sterk eyed system. The las tfo ur di gi ts ind ica te the loca tion of the notches cut in the key. These same fo ur digit s (38 23 in the illus trat ion) also ind ica te the positio n of the com bina tion w afe rs in the key way since these wa fer s must rest with in the cut aw ay por tions o f the key. If a key is not stam ped with a fa cto ry com binat ion numb er, take a n emp ty wa fe r key way a nd insert the que stio nab le key to dete rmin e its com bina tion n umber. In illu stra tion < C= , at the righ t, the shank of the key may b e seen th roug h th e slots in the key way exc ept at those co de locatio ns wh ere the ke y has been notche d. Looking firs t a t the master w af er column, the slot be­ low the di vid ing st rip is uno bstru cted ind ica ting the tip o f the key has been cut a wa y a t the bot tom . This key is a t ype # 2 (see p. 6). Th ere fore , the firs t d ig it o f the com bina tion numbe r w oul d be 2. The second di gi t of the code numb er is not rela ted t o a ny cuts on th e key and is alw ays 0 fo r stock (non-m asterk eyed) keys. Ot he r numbers are used as the second di gi t t o d esig ­ nate maste rkeye d systems, as e xpl ain ed on p. 13. Ne xt look at the 14 co de slots in the rema ining seven columns to loca te the fo ur cut aw ay portio ns of the key. In illu stra tion < C= at the righ t, these cuts occur at code positions 3, 8, 2', 3 '. The com plete com bin a­ tion numbe r which wo uld be stam ped on this key should be 20 38 23 . 7

S E T T IN G

UR

STOCK

W AFER

KEYW AY

Using the com bina tion numbe r 10 14 50 , the firs t di gi t designates a type #1 keyw ay. Select such a key way and into this, inse rt a ma ster w af er in the fir st or master column with the protr usio n poi ntin g up. The second di gi t being 0, indica tes this w ill be a stock keyw ay unit and should be set up in ac cord anc e with t he fol low ing proc edur e.

Takin g fou r com bina tion wa fers , insert them in the po ­ sitions indi cate d by the last fou r d igits o f the c om bina ­ tion . The com bina tion wa fe r is u nique in tha t i t ma y be insert ed w ith the protru sion poin ting eithe r u p or dow n in the seven com bina tion columns. The code number designa tes in which of the 14 slots the pro trusio n s hould’ be inserted. For exa mpl e, #1 wo uld be inserted point-

U N IT S

B Y C O M B IN A T IO N

ing up wa rd in the first column af te r the master wa fe r co lum n. — 4 w o u ld po in t d o w n w a rd in th e se co nd co l­ um n. # 5 w ou ld be po in tin g u p w a rd in th e th ir d co m b i­

nation column and the 0 w ould be poin ting dow nw ard in the fif th com bina tion column. Af te r the fou r com bi­ na tio n w a fe rs ha ve be en po si tio ne d, the re m ai ni ng th re e em pt y co lum ns sh ou ld be fi ll e d w ith the seri es

NUM BERS

w a fe rs . N o te th at the pr ot ru si on o f th e seri es w af er s ca n be in se rte d on ly in the lo ng er slo t o f the em pt y co l­ umns . The pr ot ru si on o f al l th e seri es w a fe rs , th e re fo re , w ill po in t in the sam e d ir e ct io n w ith in an y on e ke yw ay . W he n sp rin gs ha ve be en p ro p e rl y at ta ch e d to al l w af er s (see pa ge 1 2), the ke yw ay un it is th en re a d y to

be op er at ed by a key cut to co mb ina tio n 101 450 .

K E Y IN G

A L IK E

W AFER

K E Y W A Y U N IT S

Frequ ently it becomes necessary to alt er the com binat ions of one or m ore stock key way units to exa ctly match tha t of a noth er. The p roc edu re used to accom plish this is terme d “ keying al ik e’ ’ a nd should not be confused with “ ma ste rke yin g’ ’ which is discussed on pag e 13.

rnnn 1. i ■

~|----- -w---- «-----------

2 0 4 5 8 3

OB

□ 1 1

.

Fir st C ol um n—no cha nge is necessary.

Ji—■

'

— Se co nd C ol um n—inve rt com bina tion wa fe r so tha t protr usio n extend s thro ugh the #3 code slot.

nim i Fi fth Co lu m n— no ch ange is necessary.

S ix th C ol um n— repl ace series wa fe r with com bina tion w af er — prot rusio n to ex­ tend t hrou gh #2 ' code slot.

I I One of the simp lest method s o f k eying alik e a g rou p of stock wa fe r key way units of the same typ e, eith er t ype #T or t ype # 2, is to p ut one aside as a con trol , e mpt y the series and com bina tion wa fers from the others, then < set up = these units to the c ode com bina tion of the cont rol keyw ay, using the pro ced ure exp lain ed on page s 8 a nd 9 . An alt ern ate metho d invo lving few er ope ratio ns consists of rea rra ng ing only those series an d com bina tion wa fer s in the rando m keyway s wh ich di ffe r in positio n from those loca ted in the cont rol keyw ay. Illus trati ng this meth od, we firs t select two keyw ay units of the same t yp e—typ e # 2 in this exa mp le. The k eyw ay code d 20 38 23 wi ll be used as the co ntro l. Ne xt, exam ine th e seven com bina tion columns to dete rmin e wh at rea rran gem ent of the wa fers is necessary to match the rando m key way uni t to the c ontro l keyw ay.

Th ird C ol um n—repl ace com bina tion wa fe r with t he series w af er .

Fo ur th Co lu m n— no c hang e is necessary.

In this typ ica l exa mp le, illus trat ing the al te r­ nate m ethod of keyin g a like two ke ywa y units, only three rearra ngem ents o f the w afe rs were necessary.

11

on o

The fir st op er at io n no rm al ly pe rfo rm ed on a 9 2 0 A key bl an k is to cut aw ay a po rti on o f the tip to co rre sp on d to the ty pe o f ke yw ay un it wi th wh ich it is t o be use d. (N ot e: key bla nk s ma y be pu rch ase d wi th this not ch a lr e a d y cut by sp ec i­ fy in g 92 0A 1 bla nk s fo r ty pe #1 ke yw ay units , or 92 0 A 2 bla nk s fo r typ e #2 ke yw ay units .) A ll ot he r cuts on the key ar e ma de to the same de pth o f .0 6 0 " an d hav e the same w id th .0 6 0 " at the bo tto m o f the no tch . A ll o f the an gle s in the cuts sho uld hav e a mini mum o f 90 de gre es .

.0 6 0 "

1=® .2 52 "

Keys ac cu ra te ly cut fro m ge nu ine Sc hla ge # 9 2 0 A key bla nk s ins ure smo oth op er at io n if the dim en sio ns o f t he no tch in g, as sh own on the a cc om pa ny in g illu s­ tra tio ns , ar e clo se ly ob se rv ed .

.0 6 0 "

It is bes t to use ei th er a fa c to ry cut key as the basi s fo r the du pl ic at e, or f u ll cut pa tte rn keys a va ila b le f ro m the fa ct o ry . W ith fu ll cut pa tte rn keys it is n ece ssa ry to sele ct on ly tho se notc hes co rr es po nd in g to the sp ec ific co m bi na tio n num bers to be cut. A ft e r the keys ar e cut, dress them lig h tly w ith a fil e to rem ove sh arp ed ge s an d che ck the keys in the ke yw ay un it to ma ke sure the y op er at e p ro p ­ er ly. A ll the pro tru sio ns on the w af er s sho uld be flush w ith the ke yw ay w he n the pr op er key is i ns er ted .

As in ill us tra tio n “ H” , alw ay s ho ld the ke yw ay un it in the le ft ha nd wi th the ke yw ay cam (N2 ) to the le ft an d the “ V ” gr oo ve d d iv id in g str ip fa ci n g y ou . Then as y ou ins ert th e w af er s (see “ I” ) you w ill fin d the serie s w af er s w ill on ly go in the el on ga te d slo t o f the col um n. The y sho uld no t be fo rc ed as the y w ill no t fi t in to the in co rre ct po si­ tio n. A ll w af er s sho uld be ins ert ed in the slots wi th the pr ot rus ion firs t. This pr ot ru sio n pro jec ts be tw ee n the tw o sid e sect ions o f the stee l ke yw ay fr am e. W he n al l o f t he w af er s hav e bee n ins ert ed in to t he ir pr op er l oc at io n, ho ld the fi nis he d ca p o f t he ke yw ay u nit wi th the ri g h t ha nd (see “ J” ) an d tr an sf er the le ft ha nd so th at the firs t tw o fin ge rs co ve r the wa fe rs an d ho ld them in po sit ion as y ou ro ta te the ke yw ay un it (see “ K” ) to ex po se the sp rin g ra ck (N 6). If these w af er s ar e no t he ld in po sit ion as y ou ro ta te t he ke yw ay , th ey m ay d ro p ou t an d caus e y ou to re wo rk the setu p. A ft e r the ke yw ay un it has bee n ro ta te d, ho ld it tig h tly ag ai ns t the fin ge rs wi th pres sure by the thu mb an d the n ex er t fo rc e do w nw ar d ag ai ns t the w af er s wi th the in de x fin g e r to op en the dis tan ce be ­ tw ee n the sp rin g rac k in the ce nte r o f the ke yw ay an d the sp rin g sea t on the w af er s, to pr ov id e spa ce fo r the in se rtio n o f the w a fe r sp rin gs. The eas ies t w ay to ins ert a w a fe r sp rin g is to use a p a ir o f fin e ne ed le- no se tw ee ze rs (see “ L” ) an d gr as p the sp rin g at the sec ond co il ba ck fro m on e en d. H ol di ng it in this po si tio n, you can gu id e the fr ee end o f the sp rin g ov er the sp rin g rac k sea t an d use the ne ed le- no se twe eze rs to gu id e the ot he r end ov er t he s pr ing se at on the w a fe r. W he n all sp rin gs hav e bee n ins ert ed in the bo tto m o f the ke yw ay , ex er t pres sure up w ar d ag ai ns t the w af er s wi th the m id dl e fin g e r an d op en the dis tan ce be tw ee n the sp rin g rac k an d the sp rin g sea t on the w af er s. A ga in ins tal l the sp rin gs , as ex pl ai ne d ab ov e (see “ M ” ). Tak e the key (see “ N ” ) an d run it in an d ou t o f the ke yw ay se ver al time s as it is im po rta nt th a t all sp rin gs ar e fu lly sea ted be ­ fo re the ke yw ay un it is rea sse mb led in to the loc k.

12

Frequ ently it becomes necessary to pro vid e a gro up of locks with key way units, each havin g a dif fer en t and non -int erch ang eab le key, but all having in com­ mon one mast erkey ca pa ble o f o pe rat ing each of the locks in the gro up .

M A S T E R K E Y IN G

Com bina ting locks in this mann er is ter med < master ­ key ing = and is quite e asily accomp lished with Schlag e wa fe r key way units. To il lus trat e the p rinc iple o f mas­ terk eyi ng, cons ider firs t, tw o stock key way units hav­ ing co mbin ation numbers 20 38 23 an d 20 48 23 . These units, in common with all othe r stock key way units, cont ain one maste r wa fe r, fo ur com bina tion wa fers and three series wa fer s. Their code numbers ind ica te tha t these units are ide ntic al exc ept fo r the positio n of the com bina tion w af er in t he second column. This diff ere nce is sufficie nt to prevent int erc ha nge ab ility of th eir keys bu t a thi rd key c ould b e cut w hich wo uld ope rat e both of these key way units by pro vid ing it with notches fo r both the #3 and #4 com bina tion tum ble r position s. In othe r wor ds, the ir maste rkey wo uld b e cu t wit h f ive notches corr esp ond ing to code positions 3 ,4 , 8, 2 a nd 3. This prin cip le of mas terke ying can be exp an ded to includ e many more comb inatio ns. Howe ver, as the numb er increases, it wi ll become necessary to elim ­ inat e one o r tw o series waf ers fr om the key way units. Series wafe rs cann ot b e used in any column fo r which the key has been notched since it is the unnotch ed por tion of the key wh ich retrac ts the series w af er . At no time should a key way unit be set up wi tho ut any series wa fer s, as this decreases the securit y of the maste rkey system.

13

One meth od of lay ing out a maste rkeye d system involves five basic steps: St ep 1

70 /o to /o fo 70 70 70 /o iO

236 0 3702' 74-70 /360 /30/' Z36 9 739/' 24-69 779/' 77 2'4

Select the req uire d number o f ke yw ay units, all o f which should be eith er ty pe #1 o r ty pe # 2. (If more than 24 0 ke yw ay units ar e re qu ire d, re fe r to pa ge 18 unde r "Ex ten ded Ma ste rke y Systems” .)

S te p 2 O f the seven columns av ail ab le, a rb itr ar ­ ily select eith er 3, 2 or at least 1 column which wi ll be reserved in al l key way units fo r the place men t of series wa fer s. 16 maste rkeye d units are av ail ab le with 3 columns reserved fo r series wa fer s. 80 maste rkeye d units are av ail ab le when 2 columns are reserved fo r series wa fer s. 24 0 ma sterke yed units are av ail ab le when 1 column is reserved fo r a series w af er . St ep 3

List the code numbers o f a ll the slots in the rema ining columns. These slots are av ai l­ ab le fo r the plac eme nt of the fo ur com­ bina tion wa fer s. These code numbers also repre sent the cuts in the maste rkey which wi ll ope rate all the key way units having com binat ions dete rmin ed by the proc edu re given in step #4.

St ep 4

Util izin g the dig its ob tai ne d in step #3, ta bu lat e a list of fo ur di gi t com bina tion numbers. Alth oug h each column contains two code slots, it can acco mm oda te onl y one w af er . Th eref ore, be c are ful to select not more than one di gi t from any av ai l­ ab le column.

S te p 5 Usin g the co de num be rs de te rm in ed abo ve, fo llo w the proc edu re given on pages 8 and 9 and set up the masterkeyed ke ywa y units, p laci ng series wa fers only in those columns reserved in step # 2.

66044 3 0

There is an alte rna te meth od of mas terke ying which is pa rtic ula rly useful when ther e is at hand a numb er of assembled stock key way units, or a sup ply o f fa cto ry numbered stock keys. The fol low ing seven basic steps illus trat e this meth od: S te p 1 Select ap pr ox im ate ly one -thi rd more keys or key way units ( all o f on e typ e) th an y our a nti ci­ pat ed needs and list the ir com bina tion code num be rs as ill u str a te d to t he le ft . (Illu st ra tra tio n A). St ep 2 In this meth od, onl y one series w af er is used, so in or de r to dete rmin e which column should be re served fo r its pl acem ent to best ut iliz e the maxim um numb er o f listed keys or key way units, repre sent the key way u nit by dra win g a rect ang le and ind ica te the 14 slots by w riti ng in the ir ap pr op ria te cod e numbers (see illust ra­ tion B). S te p 3 Ab ove and be low t he rect ang le and opp osit e each slot code numb er, wr ite th e f igu re which indica tes the freq uen cy o f occurr ence of the pa rti cu lar c ode numb er in the list of c om bin a­ tions (see i llus trat ion B). S te p 4 M en tal ly ad d the two figur es in each column outsid e the rect ang le ob tai ned in st ep # 3 and dete rmin e the column havin g the lowes t sum. This column wi ll be the best loca tion fo r the plac eme nt o f a series wa fe r in all k eywa ys se­ lected t o be mas terke yed. In t he illu stra tion B, the 7th column with a sum o f one is the most des irab le loca tion fo r the series w af er . S te p 5

Review the list of com bina tion code numbers and strike out as imp rac tica l all comb inatio ns which cont ain dig its corr esp ond ing to code slots whi ch are loca ted in the column selected in step #4. In the illus tra tion , a com bina tion 10 17 24 w ou ld be elim inat ed since it contain s the d ig it 4 ', the c ode slot fo r whic h is in the 7 th column.

S te p 6 The req uire d qu an tity of key way units to be mast erkey ed should now be selected f rom th e rema ining gro up o f com bina tion code num­ bers. Remove from each o f these selected units, the tw o series wa fer s which are not loc ate d in the column reserved in s tep #4. Each of these key way units may s till be op era ted by its ow n key, but now, in a dd itio n, the y al l ca n be op er­ ate d by a maste rkey. S te p 7 The mas terke y whic h w ill op era te these units is made by notchi ng the key only at each loca tion whe re a com bina tion co de numb er occu rs. The rem aind er of the key must b e le ft unno tche d. In the illu stra tion C, the mast erkey wo uld be notche d a t co mbin ation co de l ocati ons 1 ,2 , 3, 4, 6, 7, 9, 0, V , 2'.

M ASTERKEY S T A M P IN G

Some specific d esig nat ion, such as the lette r < M = , should be stamp ed on the bow of the mas terkey . Factor y cut masterkeys are stamp ed with a regis try number pre fixe d with the lette r < R= . This numbe r is an ind ex to the fac tor y records which contain de tai led in fo r­ mati on, such as the job name, loca tion and the com binat ions con trol led by this maste rkey. Factor y cut chang e keys which ope rate the ind ivid ual key­ wa y units in a m asterk eyed system are st am pe d w it h a c o m b in a tio n nu m ­ ber. This numbe r has the same m ean­ ing as tha t st ampe d on stock keys (see pag e #7). The 2nd di git , alwa ys < 0 = on stock keys, now assumes the number of the column in the key way which contains the series wa fe r. Stock keys whose key way units have been conve rted into maste rkeye d units should reflec t this ch an ge by ov e rs ta m p in g th e 2n d di gi t with the ap pr op ria te numbe r 1 thro ugh 7.

Oc cas ion ally it becomes necessary to pro vid e two or more group s of mas terke yed key way units with each gro up having its o wn maste rkey and , in ad dit ion , a key cal led a gra nd masterkey which wo uld op era te the ke ywa y units in al l the grou ps. One m ethod of l ayi ng out a g ran d maste rkey system involve s seven basic steps. St ep 1 Select eith er typ e #1 or typ e #2 key­ wa y with whic h to bu ild the system. St ep 2

O f the seven columns a va ila ble , a rb i­ tra ril y s elect one colu mn whi ch w ill be reserved in a ll key way units fo r a se­ ries waf er .

S te p 3

If only two mas terke yed grou ps are desir ed und er the gra nd maste rkey, a r b it r a r il y se le ct a n o th e r co lu m n which wi ll pro vid e tw o slots, each of which wil l be assigne d excl usive ly to a m as te rk ey e d g ro u p an d is th e means f or s epa rati ng the two group s and prev enti ng int erc ha ng ea bil ity of the ir keys.

St ep 4

List the code numbers o f the slots in the rema ining five columns.

S te p 5 Tab ula te a list of fo ur d ig it com bina ­ tion numbers , each o f which must con­ tain one of the uniqu e s lot code num­ bers selected in step #3. The r ema in­ ing three dig its may be dra wn from the av ail ab le code nu mbers obt ain ed in step # 4, but r emem berin g to select not m ore th an one d ig it fro m any one av ail ab le column. This list of com bi­ nation numbers represent s one mas­ terk eye d gro up .

16

St ep 6

Repeat step #5. Howe ver, substitu te the ot her uniq ue slo t cod e numbe r fo r the one prev iousl y used. This list of com bina tion numbers represents the second mast erkey ed gro up . Wh ile these two gro ups may ap pe ar sim ilar, the ir ma sterkeys ar e not in terc han ge­ ab le since one w ill not have th e notch which is necessary to op era te tha t com bina tion wa fe r which is used ex ­ clusive ly in th e ot her gro up .

St ep 7

The gra nd maste rkey has all of the notches fou nd on both masterke ys and wi ll, the ref ore , o pe rat e a ll of the key way units in both grou ps. This illu stra tion represents but one of a lar ge va rie ty of possible gra nd mas­ terk eyin g arran gem ents . Mor e com­ p le x sys tem s or th os e in vo lv in g a gre ate r numbe r o f m asterkeys sho uld be ref err ed to th e f ac tor y.

GRAND

STEP

7

STEP

3

135791

SEVENTH FOR

COLUM N S E R IE S

RESERVED

W AFERS

ONE

SLOT

IN

RESERVED

T H IS

M ASTERKEYED

STEP

M A S T E R K E Y IN G

STEP

6

COLUM N

FOR

EACH GROUP

4

1 2 3 4 5 6 7 8 1' 2 '

STEP

5

SEC OND MAS TER KEY ED GR OU P

FIRST MA STE RKE YED GR OU P

1350 1360 1370 1380 130 1' 130 2' 2350 2360 2370 2380 230 1' 23 02 '

1359 3579 1369 3589 1379 35 91' 1389 359 2', 1391 ' 4579 1392 ' 4589 2359 45 91 ' 2369 45 92 ' 2379 47 91 ' 2389 47 92 ' 23 91' 57 91 ' 57 92 ' 239 2' Etc. Continuing To a Maximum of 80 Combinations

3570 3580 35 01' 35 02 ' 4570 4580 45 01 ' 45 02 ' 47 01 ' 47 02 ' 57 01 ' 57 02'

Etc. Continuing To a Maximum of 80 Combinations

EXTEN D ED

M A STER K EVED

A ND

G RAND

M as te rk ey ed or g ra n d m as te rk ey ed syst ems m ay be d o u b le d si m pl y by u ti liz in g bo th ty p e ke yw ay s (ty pe #1 an d ty p e # 2) a nd p ro v id in g a ke y c a p a b le o f o p e r­ a ti n g bo th . In such an e x te nd e d sys tem al l ke yw ay s mu st be p ro v id e d w ith a seri es w a fe r in the m as te r co lu m n. This do es no t, in an y w a y , im p a ir the o p e ra ­ tio n o f an y ex is tin g key s. H ow ev er , it do es m ak e po s­ sib le the use o f an a d d it io n a l ke y (ty pe “ 0 ” — see pa ge #6 ) c a p a b le o f ac tin g as a m as te r, gr a n d m a st e r or g re a t g ra n d m a st e r ke y. W he n a ty p e #1 ke yw ay un it is set up w ith a seri es w a fe r re pl ac in g th e m as te r w a fe r, bo th the ke yw ay un it an d its ke y ar e re de si g­ na te d as ty pe #3 . S im ila rl y, a ty p e #2 ke yw ay un it an d its ke y ar e re de si gn at ed as #4.

R E A S S E M B L IN G

LO CK

M E C H A N IS M

S te p 1

G ra sp w a fe r ke yw ay un it (N) in ri g h t ha nd . In ot he r ha nd , ho ld ou ts id e kn ob (M) w ith slo t ( M l ) fa ci n g yo u. Ins ert w a fe r ke yw ay un it (N) in to ou ts id e kn ob sp in dl e, a lig n in g ke yw ay cam as ill u st ra te d in fi g u re #1 . De pre ss w a fe r pr ot ru si on s be tw ee n th um b an d fo re fi n g e r w hi le pu sh ing in the ke yw ay un it un til it is b ot to m e d .

S te p 2

Ins ert kn ob th ro ug h ou ts id e ro se tte an d fr a m e , pu sh ing an d ro ta tin g si m ul ta ne ou sl y un til fu ll y as se m bl ed . The ke yw ay cam an d sp in dl e ea rs sh ou ld be po si tio ne d at the op en en d o f the loc k fr a m e .

S te p 3 Pla ce sp rin gs (K) in to the sli de (J) a nd as se m ble bo th in to the

fr am e lo ca tin g the fr ee end s o f the sp rin gs on the ea rs (H2 ) o f the loc k fr a m e . Be sure the b ri d g e o f the sli de is fa ci n g yo u, as ill u st ra te d .

Re pla ce th ru st p la te (I) w ith its cu rv ed sid e ov er th e sp rin gs (K) by in se rti ng the bo tto m sid e be tw ee n the bo tto m ta bs o f the loc k fr a m e an d by pre ss ing do w n sn ap in to po si tio n b e ­ tw ee n to p ta bs ( H l ).

S te p 5

W it h the th um b de pr es s the sli de a ll the w a y ba ck a g ai ns t the sp rin g te ns ion . Ins ert em pt y sp in dl e (E) as il lu st ra te d . Re­ lea se sli de an d sp in dl e w ill loc k in to po si tio n.

S te p 6

Sl ip pl u n g e r (L) ins ide em pt y sp in dl e, m ak in g sur e th a t the ta b (L I) on tur n bu tto n al ig ns w ith lo ck in g slo t (E l) . A g a in de pr es s the sli de an d w or k pl u n g e r in al l th e w a y. Rele ase sli de an d the pl un ge r w ill loc k in to po si tio n.

S te p 7

Re pla ce ho us ing ov er loc k as se m bl y w ith its op en in g in lin e w ith the jaw s o f the sli de an d re pl ac e co tt er pi n. Lock is no w re a d y fo r in st al la tio n in the d o o r.

■Hi

S te p 4

19