Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 1019 (1974): Specification For Rim Latches [CED 15: Builder Hardware]
Transcript
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 1019 (1974): Specification For Rim Latches [CED 15:Builder Hardware]
Saar Yt78171' Mow,.. M. C. Mowjee" Company Private Limited, Calcutta;""d Builder', Hardware Indultriea Aaaociatioaof India, Calcutta
M.mNrSS..I SAHIB SINGH ( AI'"..,. to
Shri YUluf Mowjee)SHRJ A.JOYBNDU PAULSHU D. ll. DAHL
S.BIP.K.S.TBI(~U~~)
SRBIJ. P. BA3AJ Institution of Engineen (India), CalcuttaS.al AIAY BIlABADWA.J Indian Institute of Architec\I, Bombay
SB81 B. D. K8SJ.8.0AB (.411",,111.)8..1 R. M. CIlAODIlBI Indian Aluminium Company Limited, calculta
S••I J. K.. AN.lifO (Altnut.)ConaOLLD 01' S '1' 0 B ••, Railway Board (Ministry oCRailwaya), New Delbl
EA."'''. R.AILWAYSBBJP.K.DBSR.I K. P.lA1.s••• v. s, RAMBO'S••I S. C. KAJIlOOa
De'. Lock IndUltri_, CalcuttaEDlineering AIIociation or India, CalcuttaJayna Tndinl CorporatioD, DelhiDirectorate General or Suppliel &. DilpOiaIs
(Miniltry orSupply ), New Delhi5.81 s. D. MAn1IIDAa National Test House. CalcuttaDa A. V. Il. RAO National Suildin.. Organization. New Delhi
SR.I o. P. RATa. (Al'''.',)S.... H. S. 58THJ it Everite Sale. Corporation, New Delhi
SRR. Y. D. 5B.GAL (~llfr.")8••1 T. C. SOLAKKI .. Sen-Harvie. Bombay
S••I N. K. RAaoowAxaiJ (~U...,..,.)S17BYllyoaO. WORK. (I ) Central Public Work. Department. New j).lbi5••1 D_ A~IT.A SIIIBA, Director Oeneral, lSI ( &-.. AI.... ~
Director (elY Boa )
""'-:1SJD&I S. P. MAGGV
AlltltaDt Director (Civ Baa) t lSI (c....-..,.,. 2 )
e e.",riPI 1975IURSAU OF INDIAN STANDARDS
TWa pabllcatloD II protected UDder the 1__~ Ad (XIV or 1957) aDd~.Ja wlaole.1a pan by&OJ ucept wllb writteD permiliiOD or thepUbJIahta"U be..... to be .. iD _t or copyript uDd. the IUd Act.
( C""i.,,~JI..,." I )
Locks and Latches Subcommittee, BOO 15: 3
e-.....MAl B. K. SINGR
Ill",,,,,,,.,DeCence Production OrrniaatioD (MiDiltry or
DeleDce) , New Delh
MMt""$S••I K. C. Mla.A (~ll"" to
Maj B. K. Smsh )SBBI MABA." ' ..eAD AGA&WA~ Gop.) Metal and Wood Worb, Aliprh;.d The
s••• S. S. ABLVWALIA Eutem Commercial • IDduatrial Eoterpri... Pri-vate Limited, Banplore
S••I P. K. DJI De'. Lock IDdUitriea, CalcuttaS8.1 S. F. DM.u Godrej & Boyce Mabufacturift, Compaa, Private
Limited, BombaySftl VI.OD K17JIA_JAIK P. P. Productl, AliprhSRBI I. C. K.B.1TJf... Directorate General of SuppU.. ... DilpOl&II
(Miaiatry or Supply), New DelhiS.al U. C. LALL Hemu Productions ( I.d. ), Aliprh
S8•• S. P. J_U."BVlnf'Ar,... (MImMU )SB~ R.. D. MARva Hapneer-in-ChieC'. Branch, Army H.adquarter.,
New DelbiS••I J. P. SAS... (MImta" )
8••1 s.Mi~ Directorate of Industries, Government or WenHeapl, Calcutta
SBaI Yuan Mow,.. M. C. Mowjee It Compaay Private Umited, Calcutta8018A8I. 8m-OR(~)
S••r K. K. SAal. Rajasthan HOUIiD, Board, JaipUl'Sau Lt.. B~17 SaAUIA H. R.. Produeta, A1iprb
AMENDMENT NO. 1 JUNE 1979TO
IS : 1019-1974 SPECIFICATION FORRIM LATCHES
(Second Revision)
Altentloa
( laKe 4, claUJe ~.l, Note) - Substitute the following for the e~istjDg
.ote:'N01'8- The si. or the rim latch shall be denoted by the overall length or the
body ....UIed from tbe outside raceof tbe fore end to the rear end.'
(BDC IS)~eprography Unit, 81S, New Delhi, India
IS.1019·1974
Indian StandardSPECIFICATION FOR RIM LATCHES
(Second Revision)
o. FOREWORD
0.1 This Indian Standard (Second Revision) was adopted by the IndianStandards Institution on 13 December 1974, after the draft finalized bythe Builder's Hardware Sectional Committee had been approved by theCivil Engineering Division Council.
0.2 The specification for rim latches was first published in 1957 andsubsequently revised in 1963. In the second revision zinc base alloypressure die casting has also been allowed for the manufacture of rimlatches.
0.3 This standard contains clause 4.2 which permits the purchaser to usehis option for selection to suit his requirements.
G.t In the rormulatioll of this standard due weightage ha~ been given tointernational co-ordination among the standards and practices prevailingin different countries i. addition to relating it to the practice in the fieldin this country.
0.5 This standard is _ of a series or Indian Standards on builder'shardware.
0.& FUl the purpose oddeciding whether a particular requirerqent or thlsstandard is complie4 with, the final value, observed ordalCulatedtexpressing the result of a test or-analysis, shall be rounded 0 in accordance with IS: 2-1960*. The number of significant places ret ned in therounded oft' value should be the same as that of the specified v~ue in thisItandard. ,.
1. ICon1.1 Thi. standard lays down the requirements regardlDf material,dim_lions, manufacture and finish of rim latches for genera use.
2.1 Handing of rim latches shall be determined by the handing of thedoor on which it is fitted, the latch is termed C left hand' if it is fitted on.: left hand door' and 'right hand' if it is fitted on 'right hand door'.For handing of doors reference is invited to IS : 1003 (Part I )-1966·.
3. TYPES
3.1 Rim latches shall be of the following two types: .
Type 1 -RiIll latches which open when the handle i~ turned in onedirection only.
Type 2 - Rim latches which open when the' handle is turned inany direction.
3.1.1 Type I rim latches shall be either 'lift hand' or 'right hand',
4. SIZES
-t.l The standard sizes of rim latches shall be 75, 100, 125 and 150 mrn.
~OTB - The size of a 10 1m latch shan be denoted by the length of the face acrossthe body in millimetres.
4.2 Rim latches of sizes other than those specified under 4.1 may besupplied by mutual agreement between the purchaser and the supplierbut the provisions laid down in this standard shall be generally followed.
5. MATERIAL
5.1 Materials used for different component parts of the latch shall complywith the requirements given in Table 1.
6. SHAPE
6.1 Tile shape, design and mechanism of rim latches and their partsindicatep in Fig. 1 and Fig. 2 are intended to be illustrative and forguidance only. The manufacturer may make rim latches of any shapeto suit his design.
7. DIMENSIONS AND TOLERANCES
7.1 The leading dimensions ofType I rim latches and tolerances thereonshall be as given ill Table 2 read with Fig. 1.
7.2 The leading dimensions of Type 2 rim latches and tolerances thereonshall be as given in Table 3 read with Fig. 2.
·Specification for timber· panelled and glazed .buttera: Part I Door .hutt..(/&r,' ,.IIi,••).
IS ,1019 -1974
8. MANUFACTURE
8.1 Rim latches shall be of mild steel, brass, aluminium alloy or zincbase alloy.
8.2 Type 1 Rim Latches -r-Se« Fig. 1 for illustration.
8.2.1 Body - The body shall be of mild steel sheet or cast brass unlessotherwise required to be of rolled brass sheet, or aluminium alloy castingor aluminium alloy sheet or zinc base alloy. When sheet is used, it shallbe pressed {Jut of a single sheet. Al ternatively, if it is cut andshaped, the joints shall be welded or brazed. The front portion of thebody shall have a circular hole in which the spindle shall work and arectangular slot in which the locking pin shall work, The circular holeshall be fitted with a brass bushing only in the case of steel rim latches.On the side plate there shall be rectangular slots to suit the latch headand the locking pin.
8.2.2 Back Plate - The back plate shall be of mild steel or cast brass,unless otherwise required to be of rolled brass sheet, or alurninium alloycasting or aluminium alloy sheet and shall have a hole for permitting thespindle to operate. Provision shall be made for its proper fixing to thebody.
8.2.3 Latcli Bolt - The latch bolt shall be ofcast brass or a combinationof brass bolt with a steel lath. When steel1ath is provided it shall beadequately protected against corrosion by galvanizing or cadmiumplating.
8.2.4 Follower - The follower shall be of brass, leaded tin bronze oraluminium alloy. It shall be suitably moulded and machined. It shallhave a 8-mm square hole at its centre to suit the spindle which operatesthe bolt.
8.2.5 ..~p,ing - The bolt shall be fitted with at least one flat or ftattendwire spring which shall be o£ either phosphor bronze or steel. The springshall withstand the test given below without showing any sign of perma-nent set:
'The spring shall be pressed down completely and then released.This shall be repeated six times.' ~
8.2.6 Locking Pin - The locking pin shall be of cast brass and shall beof suitable shape.
1.2.7 Spindl,-The spindle shall be 8 mm square in section and shallbe of mild steel. Towards one end it shall have a hole at a suitableposition for riveting the knob and on the other end there shall be atleast three holes at suitable distances, that is. 6 mm apart for adjustingthe position or the knob according to the thickness of the door shutter.
S
TA
BL
E1
RE
QU
IRE
ME
NT
SF
OR
MA
TE
RIA
LS
OF
BlM
LA
TC
HE
S
(C
l.us
,5.)
)
SL No.
MA
'rD
IAU
TY
PIC
AL
EX
AJl
PL
.o
rS
UIT
AD
LlC
Ga
AD
EIN
IND
IAIe
ST
AJi
DA
IUl
RI:
Ql:
UU
l;M
JU\'
1'S
OF
"IA
-rB
l\JA
L8
... •.. :; ... to • ... • ;;:
o
(I)
i)M
ildlt
ee)
(2)
(3)
Gra
de'O
'of
IS:
1079
-J96
8·
(4)
Fin
iehe
dce
mp
on
euts
shal
lsa
tisf
yth
ero
llow
inl
ben
dte
st:
•T
he
com
po
nen
tp
art
wh
enco
ldsh
all
wit
hIt
and
,wit
hout
deve
lopi
ngcr
acks
bein
gd
ou
ble
dov
erei
ther
by
pres
sure
orby
blow
sfr
omh
amm
eru
nti
lth
ein
tern
alra
diul
iseq
ual
toth
eth
ick
nea
ord
iam
eter
orth
eco
mp
on
ent
par
tan
dth
esi
dea
are
par
alle
lIt
ii)G
ahaa
iPd
mild
Itee
lw
ire
(fo
rri
vets
)
iii)
CU
tbr.
..
i.)
Br...b
eet
v)P
hosp
hor
bro
n.e
wir
e
ft)
Ste
elw
ire
(or
spri
ng
yjj)
Lead
edtiD
broD
ze
IS:
280·
1972
t
Gra
de
3or
IS:
292-
1961
:
Gra
de
Cu
Zo
40o
fIS
:41
0-19
6if
Gra
de
PC
uS
n4
of
IS:
1385
-196
8i1
Gra
de
2o
fIS
:44
34-1
9671
Qra
de2
errs
.318
-196
2··
Th
ew
ire
thal
lw
iths
tand
,w
ith
ou
tbr
eaki
ng.o
rsp
litt
ing
bein
gw
rap
ped
eig
htt
imes
rou
nd
itaow
nd
iam
eter
and
subs
eque
ntly
stra
ight
ened
Co
pp
erco
nte
nt
shal
ln
ot
bele
ssth
an60
per
cen
t.C
asti
ngsh
all
be(r
eefr
omb
low
hole
s,su
rfac
ean
do
ther
cast
ing
def
ects
Th
ebr
ase
shee
tsh
all
mee
tth
esa
me
ben
dta
tal
spec
ifie
dfo
rm
ild
stee
I
viii)
Alu
min
ium
a)
loy
prel
lW"e
die
cu
lm..
is)
Alu
min
ium
aIlo
yab
eets
s)Z
inc
bale
allo
yp
re
DW
'eel
iecu
tin
l
ISD
eaip
atio
nA
-SeM
orA
·6-M
of
IS:6
17-1
959t
t
ISD
esig
nati
onN
Sf
orN
S5o
fIS
:737
1974~t
IS:
7f2-
1966
11
--a
·Spe
cifi
cati
onro
rh
ot
roll
edca
rbon
stee
lsb
eet
and
stri
p(J
,e.t
lr'r
lisiO
ll).
tSpe
cifi
catiO
Dfo
rm
ild
Itee
lw
ire
for
gene
ral
engi
neer
ing
purp
oles
(s"
."d
rn;s
Unt
).~Specification
Corb
n.
iJllO
Clan
deu
tiap
(r.".~).
ISpe
cifi
cati
onCo
rro
lled
bra
.p
late
,she
et,s
trip
and
foil
(J,e
oruJ
,,,,
ilio
n).
USp
ecifi
catiO
D(o
rph
osph
orbr
onze
·rod
san
dba
".,
shee
tan
dst
rip
and
wir
e(f
irJ'
,lVis
itm).
'Sp
edfi
cati
oa
for
Itee
lw
ires
for
cold
form
edsp
ring
s-··
Spe
cifi
cati
onfo
rle
aded
tinbr
onze
ingo
tsan
dca
stin
gs(
r'Dis
,tI)
.tt
Spe
cifi
cati
OD
for
a)um
iDiu
mal
loy
inlo
tlan
dca
ltin
gs(o
rge
nera
len
gin
eeri
ngpu
rpos
es(
"vis
,Il)
.~~Speci&catioD
for
wro
ulb
tal
umin
ium
and
alum
iniu
maU
o)'.,
shee
tan
dst
rip
{fo
rge
nera
len
gine
erin
gp
urp
oH
l(.&
M~
,ft1i
sitna
)•I'
Spe
cifi
cati
onfo
rzi
ncba
aeal
loy
die
calt
ings
(fi'
$'
rnis
iola
).
fJ - ... o ... CO • :; ~
I .. ... S • • ... S ...
ttl
@F
OlL
OW
ER
@S
TR
IKIN
GB
OX
~-----,
l__
____
J..
.-$-
1IC
II
Tl~E£L
SPR
ING
G>B
AC
KP
LAT
E .DS
EC
TIO
NY
Y
'8J
N
@S
PIN
DL
E
~ •....
,I:..
L •.,S
EC
TIO
NX
X
@S
PR
ING
• Dzr
Ii,
I,-
@K
NO
Bif> iS~Y .'
~ (DL
OC
ICIN
GP
IN
Ire'---
.-,---.,
,
rA
t
\1
)•
t • • • I • • • • • • LL
:':-
..J
@@
VIE
WSH
OW
ING
wrT
HB
AC
KPL
AT
ER
EMO
VED
<Z>P
AR
TS~
BO
LT
ASS
EMB
LY
FlO
.1
TY
PIC
AL
DE
SIG
NO
FR
IML
AT
cH
-TY
PE
I
•
TA
BL
E2
DIM
EN
SIO
NS
OF
RIM
LA
TC
HE
S,
TY
PE
1
(C
ltlfls
,7.1
and
Fig
.1
)
All
dim
ensi
on
sin
mil
lim
etre
s.
a)&
Iild
S,.,Iu
t,h
SIZ
Eit
BC
DE
FG
'H
JK
LA
I.,\
.P
Q.
RS
TV
O~
RIM
(Ap
pro
x)
Mi"
Itti
"M
itl
LA
TC
:lI
(I)
(2)
(3)
(4)
(5?
(6)
(7)
(H)
{9i
(10)
(11
J(1
2)/f
3)
(14,
l(l5'~
(16'
,(l
i)(1
8)(1
9)(2
0)
7575
6014
lO·O
1620
8'0
8'[
1-~
GO95
'27
itj
40-r
:20
(j1·
606
1,1
13
~10
010
070
2010
'0H
i22
e-o
R'O
9,~
iO95
-r:
lti40
no20
b1-
606
..I
125
125
7020
11·2
20:l:
!8
'0ao
1~:l
7095
27If
)4(
J30
:!O6
16
06
150
150
7020
12·5
22'I.
lB
-Ug
,\!
ItS
709:
'27
Hi
40HO
2010
1·60
5
l·OI~ER·
±I
±1
±l
:t:O
'5~1
i1
.ru-
,~,±
I)'j
_~O
·~)-
:.=2
±1
~.,I
±l
~J..-2
:t
Ali
CE
S
b)B
'4SS
,Alu
mi"
ium
All
oyan
dZ
inc
Ba
.•eA
l"!,
'L
atch
es
Sam
e.1
for
mil
dst
eel
latc
h,
exce
pt
that
the
thic
knes
so
fb
od
ypl
ate
and
back
pia
u-sh
all
b(\
no
tle
ssth
an2:
5m
infi
nish
ed(o
rlO
Om
"1ft
-aftd
·t25-
-mm
"rim
fat(
"hes
and
no
tle
ssth
an3
mm
for
k50
mm
rim
latc
h.
... •.. .. o ... ca • .... ~ --.a ...
~S
EC
TIO
NY
Y
@S
TR
IKIN
GB
OX
@K
NO
B
~ •(i
)SPI
ND
LE
'-LJ:
.t~
SE
CT
ION
XX
VIE
WSH
OW
ING
WIT
HB
AC
KP
LA
TE
RE
MO
VE
D
FlO
.2
TY
PIC
AL
D.B
SIG
NO
PR
IML
AT
CH
-Ty
pE
2
J_
-.f~J
• - I-~-fJ
II •
~I
ace:::::
I-k
'1,
SEC
TIO
NB
BS
EC
TIO
NA
A<D
BA
CK
PL
AT
E(2
)BO
LT
ASS
EMB
LY
-tt.
.~.
c==@
@S
PR
ING
1.11
III
i.,
---'
"r
.......,
.~~JI
®FO
LLO
WER
@LO
CK
ING
PIN
@0
TA
BL
E3
DIM
EN
SIO
NS
OF
RIM
LA
TC
HE
S,T
YP
E2
(C
last
7_2
and'
Fig
.2
)
All
dim
ensi
ons
inm
illi
met
res.
a)M
ull
St.
,UkA
.....:
...
e:..
..~...
...-
Sit
,.A
BC
DE
FG
'H
]K
LM
NP
QR
T,
T.
01
'R
IM(A
ppro
x)M
inM
inL
AT
CH
(i)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
...75
7560
141
0'0
1620
8'0
S'O
7360
9527
1640
7520
1'6
01·
£0...
100
100
7020
10'0
1622
8-0
8'0
9870
9527
1640
8020
1'60
1-60
125
125
7020
11-2
2022
8'0
e-o
123
709
i27
1640
8020
1'60
1'60
150
150
7020
12'5
2222
8'0
8'0
148
7093
2716
4080
201'
602
'00
TO
LB
R-
:1:1
:1:1
:1±
O'5
±l
:!:l
±O
'5:i
:0'5
±O
'5-
=2
::i:l
±1
:1:1
:1:2
±I
~JlCS8
- b)B
,tlss
,AI
Ufn
inifl
mAl
lo,)
and
Zira
cB
as«
All
o.1u
tcM
s,
••-
t"
....
..~
....
....
....
.~
",:•
•~~
....
:••
••"'!
!-#~
(o;;
\;._
-"\"
'.•"
t'.
....
..
..
Sam
e8.
for
mil
dst
eel1
atch
,ex
cep
tth
atth
eth
ickn
ess
of
bo
dy
pla
tean
dba
ckp
late
shal
Jbe
no
tle
ssth
an2"
5m
mfi
nish
edfo
r10
0m
man
d125~mm
rim
latc
hes
and
no
tle
ssth
an3
mm
for
150
mrn
rim
latc
h.
.... en .. ... o ... \9 ,. ... • ~ ..
18.1019.1974
8.2.8 Knobs - Knobs shall be of brass or aluminium alloy and shallbe cast hollow in one piece, unless otherwise required to be made frombrass sheet or aluminium alloy sheet by the purchaser in which case thegrip shall' be secured to it by brazing. The knob shall fit on both theends of the spindle tightly and shall be fixed by means of a screw on thespindle in one of the adjusting holes at one end and riveted at the other.Alternatively, spring type lever handle conforming to IS: 4992-1968*may be used.
8.2.9 Disc -A disc of cast brass, sheet brass, aluminium alloy castingor aluminium alloy sheet shall be provided for fitting on the outside ofthe wooden door shutter. It shall have a central hole to suit the spindleand two small holes for fixing it to the door shutter.
8.2.10 Striking Box - Each rim latch shall be provided with a socket orstriking box which shall be pressed from mild sheet, unless required tobe of cast iron in the case of steel rim latch, cast brass unless required tobe of sheet brass in the case of brass rim latch, aluminium alloy castingor aluminium alloy sheet in the case of aluminium rim latch and zincbase alloy casting in the case of zinc base alloy latch. It shall have twocountersunk holes for fixing it to the door shutter.
8.3 Type 2 Rim Latches -See Fig. 2 Cor illustration.
8.3.1 Body - The body of Type 2 rim latches shall comply with therequirements laid down under 8.2.1. .
8.3.2 Latch Bol: - The latch bolt shall be of cast brass or a combinationof brass bolt with a steel lath. When steel lath is provided it shall beadequately protected against corrosion by galvanizing or cadmiumplating.
8.3.3 Spring - Spring shall be of either phosphor bronze wire or harddrawn seeel wire. Other wire or flat having similar properties may alsobe used with the approval of the purchaser. It shall be wound. round asuitable arrangement connecting the plate to the bolt such that the boltis normally in the locking position. When the bolt assembly is operated,the spring shall be compressed and as soon as the handle is released thespring shall throw the bolt back to the locking position. .
8.3.4 The back plate, follower, locking pin, spindle, knobs, disc, andstriking box shall comply with the requirements laid down under 8.2 forcorresponding components.
,. WOIUOlANSHlP AND FINISH
t.l The rim latches shall be 10 assembled as to function smoothly.
·Speci8catioa lor dow-baadl. (or mortice loeb ( Yel'acal type ).
12
IS.1019-lt7t
9.2 Braa latches shall have bright or satin finish, and aluminiumlatches anodized finish. The anodic coating shall not be less thanGradeAC 150f15: 1868-1968*. The anodic film may be either transparentor dyed as specified by the purchaser. The steel latches shall be blackjapanned, stove enamelled black, or copper oxidized as specified by thepurchaser.
10. PERFORMANCE REQ,UIREMENTS
10.1 The finally assembled rim latches shall be capable of satisfying theperformance requirements.
10.1.1 When the knob of the latch is turned, the latch bolt shall drawsmoothly into the body and shall be flush with the face of the body.
11. MARKING
11.1 Each rim latch shall be marked with the manufacturer's name ortrade-mark.
11.1.1 The rim latch may also be marked with the lSI CertificationMark.
NOTJI - The use of the lSI Certification Mark is loverned by the provilions of lb.Indian Standards Institution (Certification Marks) Act and the Rules and Relulation. made thereunder. The lSI Mark on products covered by an Indian Standardconvey. the a.uran(-e that they have been produced to comply with the requirement.of that Itandard under a weD-defined sYltem of inspection. testing and qualitycontrol which il devised aDd supervised by lSI and operated by the producer. lSImarked produclI are also continuously checked by lSI for conformity 10 that ltandardal. further .rt-guard. Detail. of conditions under which • licence (or the use oftbe lSI Certification Mark may be ""Dted to manuCacturen 01" procellOrl. may beobtained from the Indian $tandardl In.titudon.
12. PACKING
12.1 Each rim latch sball be wrapped in a paper and packed in a cardboard box. Each carclboard box 51'\al1 be marked with the followinginformation:
a) Manufacturer's name or trade-mark,b) The ( hand • of latch in the case of Type 1 latch;c) Type of latch, andd) Quantity in the package.
II. IAMPUNG
13.1 Sampling and inspection of. cODsignmen t of latches shall be carriedout in accordance with the provisiODllaid down in Appendix A.
especilcadoa r. aaodic caadDp OD alWDiDium (p,' ,..,. ).
IS
· ·18, IOI? "I".
APP'ENDIX A
( Claus, 13.1 )
SAMPLING AND CRITERIA FOR CONFORMITY
A·I. LOT
A-I.I In any cOllsignment, all the rim latches of the same type and sizeand manufactured at the same time shall be grouped together toconstitute a lot. .
A-l.2 Lot Size and Sample Size·- The number of rim latches to beselected fran} a lot' shall depend on the size of the lot and shall be inaccordance with col J and 2 of Table 4.
TABLE .. SCALE OF SAMPLING AND CRITERIAI'OR CONFORMITY
( Claus" .~·1.2 Gild .\-3.1 )
LoT SIZE
(I)
U.p to ;lOU201 to 31M-'SOl ,.500
501 ,t 800801 and above-
SAMPJ.R SIal:
(2)
1$
2U3040
55
P••MJUIBL. NUMluua01' 0 &J'BOTIVB8
(3)
o1
223
A-I.3 The rim latches for testing shall' be selected at random from atleast 10 percent of packages subject to a minimum of three, equal numberof rim latches being selected (rom each such package
.\-2. TESTS
&-2.1 AU the rim latches selected as in A-l.3 shall be checked fordimensional requirements (I" 'l), defects in manufacture (s" 8 ), work-manship and finish (It' 9), -and performance (ItI 10). Any rim latch,which fails to satisfy one or more of the characteristics shall be considered al defective rim 'latch.
A-S. CRITBIUA FOR CONFORMITY
.-'.1 A lot shall be considered as conforming to the requitements of!'~hisstandard if the number of defective rim latches .mong~those tested doesnot exceed the corresponding number given in col 3 or Table 4, otherWiseit Ihall be considered as not conforming to the requirements of thisltandard.
14~ .'.
BUREAU OF INDIAN STANDARDS
Regions' Office.:Central : Manak Bhavan, 9 Bahadur Shah Zat.r Merg,
NEW DELHI 110002-Eastern : 1/14 C. I. T. Scheme VII M, V. I. P. Road,
Maniktole. CALCUTTA 700064Northern : seo 445-448, Sector 35-C,
CHANDIGARH 160038
H••dquane,.:Manak Bhavan, 9 Behedur Shah Zaf., Marg, NEW DELHI 110002Telephonel: 331 01 31. 33113 76 Telegram.: Manek••nltha
( Common to .11 OHlc..)T.'.phtJn.
{331 01 311331 13 7&
38 2499
218433 16 41
41 2442Southern: C. I. T. Campus, MADRAS 600113 41 26 19
