Note: Descriptions are shown in the official language in which they were submitted.
F RO~ O c ~ ~ n~ i t. .l r ~ d ~ U I T g~ X ~ n~ 9.~ 12~ F, 7
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Curtain rail and method of it~ manufacture.
he lnvention relates to a curtnin ri~11 con~istir.g o~ a
proile provided wlth a sllt for allowing pa~sage eO
,~ curtaln hanglng device~, and next to ~aid s~t a space f~r
receiving slldlng or rolling parts of the curtaln hanginq
devicen.
Such curtain rai1s are known in many embodimont~.
The 6hapq o~ the profile i9 dependent on the curtain
lo hanging devices u~ed. Snid devloes may bc prov~dcd with ~:
rollinq part6 ln thG ~hape of running wheels, often -~ :~
referred to as runners, or with 61iding devices, often made
of synthetic material.
15 Further~ore, there are curta~n hanging d~vice~ that are to ::
be inserted at the end ~lde of the rail, in no way being
allowed passaqe through the alit, and c~lrtain hangins
device~ that can be inserted through the sllt. Of the .~ - :
latter kind there exist two main variant~, i.e. those that . -:
are reoillent whon pa~ed throug~ the ~lit, and the
e~bodi~ont which prov.;des that thc curtAin hanging devicee
can be lnserted into the elit in one position only and,
a~tcr havlny been turned, ucually at a right angle, obtain
the operatlng positIon whicn preYentc pa~sage throuqh the '-~
sllt.
lt is not unu~u~l that at the part which extrudeY the sli.t,
ourtain hanging device~ are fitted with a restraining or
~toyplng part that prevents the hanginq device fro~
enterlng the 61it too deeply, as a result of which it n~ay
take an uncontrolled position, which m~y lead to
lrrequ1aritie~
Tho way a curtain iFi drawn alon~ a curta1n rall often
conei~t~ o~ grabhin~ the cu~taln lt~el~ or else t~e curtal.n
cord. In that ca~e the force exerted on the curtain i~
often not parallel to the curtain ~uIface, tran~ver~e
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forces belng exerted instead.
8~metlmel- n oure:aln hanglng d~vlc~ b~comQs out of
allgnment, as a result of which it gets more or le9~ stuck.
~he aforementioned efrects nay give cause rOr ~riction when
the various types of curtain h~nging devicee are u~ed. ~nce
frictlon ha~ occurred, it ~ay lead to the first hanglng
device taklng a wrong positlon, re~ulting ln an increa6e of
10 the resistlng force already experienced. Due to the ;~
re6i~ting force and the norm~l reactlon thereto, belng
tugging, not only the curtain oan be damaged, like a
hanging devlce tecomlng dl6engaged, but abra6ion of the
rail may also occur, ln particular abra~lon of a possible
coat of varnish. In ~ractlce thls ~hortens the life of the
rail, because r-palntinq with ~ mechanlcally ~uf~iclently
~trong paint i~ very dirflcult, in whiCh case it should be
~ept in mlnd that the original coat of varnish often is
obtsined by applylng powdor, for lnstance by mean~ of ~:;
electrostatlc spraying, followed by heating the rail
carrying the coat of powdor untll the latter i~ burned in,
areatlng a tightly ~ealed layer.
The lnventlon alms at elloinating the aforementioned
disadvantage~ Or friction, lncluding the abra~ton mentioned
above, or at any rate
at reduclng them.
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A friction reduclng layer for a curtain rail as mentioned
above, i5 per ee known rrom the Netherl~nd~s p~tent
appllcation NL-A-7603170 or the corresponding Austrlan
patent ~peclrlcatlon AT-~3 350~11, in which on an extruùed
profile of synthetic mat~rial, such as, amongst other,
things~polyvinyl chlorld-, slmult~neously wlth the
35 extruslon of the profil- a coat with high ~lldinq -
propertien of polyester, poly~ide - 11, poLyamlde - 12,
chlorlnated poly-ethyl-ne or ahlorinated polypropylene le
extruded as well.
~orl nclrooi~u~ d~ ~11 B'J ~ O~ B9B~l '9~ 28 D, 4
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From Week 8622, april 19, 1986, Derwent Publlcation~ Ltd ,
Iondon, Great Rrltaln AN 86 140 89a L JP, A, G 1075 594
(KITAMURA~ ls rurthermore known the friction roduc~ion of
the ~urface of a moulded pla~tlc product, which can be
made, amongst other thlng~, of polyvinyl chloride, by
applyinq an aq dlsper~ion of an F- containing resin,
optionally ln the peesenco of sllicone, and ~y removing
sald layer by washlng or wiping
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o ~he lnvention alm~ at provldlnq a frlction reduclng layer,
whlch can be oaolly applied, al~o on metal or a mufflod
layer, wlthstandE ab-aslon and doe~ not affect the exterior --
or colour of tbe rall
15 To this end the lnvention provldes that the antl~riction
layer consist~ of one of the materials belonging to the
group polyvlnyl chloride, a sllicone and
polytetrarluoro-thylene ~ ~;
20 A surrace layer 18 deflned a~ a layer that i~ located on -
the out~ide o~ tho proflle, but ~190 around and in the
~pace to whlch the ~lit gives acce~s The layer is
pre~erably made Or polyvlnyl chlorlde, which, when warm,
can be oa~ily applied in a sutficlently thln layer ~hus
very good results have been achlevod wlth polyvlnyl
chlorlde, namely ~uch a thln layer that it ls virtually
lmisible~ and~ moreove~, a cle~rly noticeable reductlon oE
frlction Curtain rail- are usually located diroct over
heatlng radiators, th~s in the warmest place~ of a room or
lo spacQ lt has been round, how-v-r, that even under those ~-
olraumJtanaes the layer remalns smooth and does not become
~ticky An other group of synthetlc material~ with frlction
reduclng propertle~ ls constituted by sllicones The~e,
howev~r, may become somewhat ~ticky in a war~ place
~ ~ory trong and hlghly rrlctlon reduclng ~ynthetic
material ls polytetrafluoro-thylene It ls more expe~si~Jo
and ~ore difricult to apply than polyvinyl chlorlde and ie,
thers~ore, in the ~lrst place to be consldered for 'heavy
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duty' cases, such as a hea~y curtain th~ f4r7quently has to .~
~ be drawn. 210~
The invention i~ particularly of use when, in a way known
per se, the profile wall ad~acent to t~e slit has been
rounded off and has been slightly bent inward. In that case
the weight of the curtain will be entirely on the rounded
edges adjacent to the sl.it, thus on a small surface.
It has been ob6erved that also in that case a polyvinyl
layer ~s highly abrasion-resl~tant and friction reducing.
.
A curtain rail is preferably provided with reinforcing - ~.
ribs. When, however, 9uch ribs come into contact with the
: curtain hanging device~, this may easily lead to abrasion
. 15 and thereafter to increas~ng friction. In applying the
invention this disadvantage is reduced to a high degree.
further embodiment of the invention accordingly provides
that the profile has inward stick~ng ribs acro~s the slit
that are positioned in the wldth direction beside the slit.
An effective method of ~an~ufacturing a curtain rail in
accordance with the invention i9 con~tituted in that the :~ .
r~il i8 vertically immorsed into thin liquid thermoplastic .
synthetic material, li~te~ out of the liquid, made to drlp
dry at or approximately at the temperature of the liguid
and ie cooled down aft-rward~. :
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In practice this can be effected by hanging the rail
lengthwise in a deep container fllled with liquid
thermoplastic 6ynth~tic materIal and 6ub~equently by
withdrawing it relatively 510wly. The part that has ~ust
left the liquid is sti.ll warm and is therefore capable of ~ :
dripping dry ~atlsfActorily. When the entire rail has been
Ilifted out of the liquid, only the bottom part is left to
35 drip dry, wherea~ the upper part has already cooled down. m- -
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A rail thus coated wit~ polyvlnyl chloride has a layer of
~aid synthetic material that ls 80 thin (in quantities of .:~
tenths of millimetres) that little material i5 used, which
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limlts the cost aB well. These cost are certainly low
compared to the cost of the finishlng procesB ~ which i~
us~ally carried out prlor to Applying the ~o~ ln
accordance with the invention. For a rail made of alu~inum -
the finishing consi6ts of hardening the str~ngpressed rail,
degreasing it, chromatizing it ~s a protection again6t
oxidation and to prevent depo61t in moist surroundings,
applying a powder coating at the inside and outside of the
rail by ~eans of electroetatic spraying and muffling it.
Such a ~uffled layer may be smooth, but considerably less
80 than, for instance, a layer of~polyvinyl chloride. -~
The invention will hereinafter be further explained, -
reference being ~ade tot t~e drawing where: -
fig. 1 shows a cross section of a curtain rail according to
the invention; and
fig. 2 schematically showc the layering structure thereof.
In fig. 1 a cross section of a curtain r~il is shown with a
body 1 and upright legs 2. The legs are bent inward at
their ends and thus form f langes 3 which have a bending and
thlckening 4 at their endc ad~acent to the sl$t 8, which
form supporting ridges 5 at the inside of the profile.
Reinforcing ribs 6 reinforce the body 1, in which case it
25 is irrelevant whether they come lnto contact with runners ~ ~
or ~liding devices that are not drawn, because said ribs ~ -
are coated with a protecting, friction reducing ~ayer. The
thlckenings 7 between the body 1 and the legs 2 likewise
serve a~ r~inforce~ent.
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In fig. 2 the aluminum of the rail is lndicated by 9, the
chromatized ~ilm by 10, the muffled layer by 11 and the
layer according to the invention by 12. For the sake of
clarity lo and 12 are proportionally drawn too wide.
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