Rotary clo~ure
The inventlon relatea to a rotary closure for adjustable and
releai~able drawing together of two closure elemente,i which
can be braced relatlve to one another, according to the
preamble to Claim 1.
Rotary closureii of the type set out ln the preamble to Clalm
1 are known from EP-B-393 380 and EP-A-412 290. The~e known
rotary closure~ are constructed particularly for use on
sport~ ~ho~s. The cloiure flaps of a sporti shoe can be
drawn together or released by windlng a traction cable onto
a winding pulley which i8 rotatably mounted ln a housing or
unwinding lt therefrom, and for this purpose this wlndlng
pulley has a tractlon cable receivlng groove in whlch at
least one end of the traction cable is fixed. So that a
corresponding sports shoe can be adapted to a user's foot,
accurate adJustment of these rotary closures le provided in
that a rele~able locking arrangement or r~tchet arrangement
18 disposed in the region between a rotary knob whlch acte
on a rotary actuatlng spindle and the wlnding pulley.
Further~ore, the rotary actuatlng spindle which is rotatably
mounted ln the centre of the houslng lc in drive connection
wlth the wlndlng pulley by way of a gearing arrangement, for
example a planetary gear.
The obJect of the invention is to make further improvement~
to a rotary closure of the type set out ln the preamble to
Claim 1 in such a way that it is distingulshed by parti-
cularly favourable arran~ement and guldlng of the tractlon
cable.
:
This obJect is achieved accordlng to the inventlon by the
featureis ln the characterlsing portlon of Clalm 1.
Advantageous embodlment~ and further developments of the
- 2 ~ 2~31 ~ g
invention are the sub~ect matter of the subordlnate clalm~.
Whereas in the known constructlons descrlbed above the
traction cable i8 fixed with one end or wlth both ends ln
one single traction cable receiving groove, the lnvention
proposes that ln the plane of or at the helght of at leaet
one tractlon cable recelvlng groove whlch runs around the
outer circumference of the windin~ pulley there is provlded
a hub bore which diametrally traverses a central hub re$10n
of this wlnding pulley and throu~h whlch the tractlon cable
18 loosely passed wlth a longltudlnal portion located
betwesn its two end~. Thus the tractlon cable, which co-
operate6 wlth two closure ele~ents whlch can be braced rela-
tive to one another, can be reliably dlsposed and guided ln
the assoclated tractlon cable recelvln~ ~roove, but ln an
extremely advantageous manner a free longltudlnal movabillty
of thls tractlon cable 1~ ensured at least at the beginnin~
of the tenslonlng or closure operatlon of the corre~pondlng
longitudinal portlon of tractlon cable wlthln the ~csociated
hub bore, receivlng groove and a~ociatad tractlon ~cable
holes in a hou~lng wall. At the beginnlng of the tensionlng
or closure operatlon thl~ free longltudinal movabillty of
the traction cable contributes to an extremely good centrlng
of the cable (self-centring) in the raglon of the winding
pulley, so that the closure elements which are to be drawn
together can be braced relative to one another in a manner
whlch i8 extremely well adapted to the indlvidual closure
elements.
One particularly advantageous embodlment of the inventlon ls
al~o to be seen ln the fact that the two outer mouth por-
tlons of the hub bore ln the wlndlng pulley are inçreasln~ly
wldened outwards in the radial dlrectlon in such a way that
- when con~ldered ln a top view of the windlng pulley and ln
the directlon of wlndlng thereof - they extend ~o that they
are curved backwards wlth the groove wldth remalnlng con-
-3- 21131~9
stant. A~; a result of these constructlons, durlng windlng
on of the tractlon cable ln the associated tractlon cable
recelvlng groove of the wlndlng pulley there are produced
somewhat smooth transltlon~; from the hub bore to the outer
clrcumferentlal wall of thi~; hub, that ls to say to the
lnner clrcumf~rentlal reglon of the clrcular tractlon cable
recelvln~ groove. Thus the correspondln~;S portlon of
tractlon cable ls deflected wlthout slgrliflcant buckllng
fitress into the tractlon cable recelvlnE~ groove.
Wlth regard to the lnstallatlon or replacement of the
tractlon cable, lt ls easy to lmaglne that wlth thls con-
~tructlon accordln~S to the inventlon a correcpondlng
tractlon cable can also be pa~i~ed easlly from the exterlor
through associsted tractlon cable hole~; ln a perlpheral wall
of the houslng and through an a~--soclated hub bore without
the rotary clo6ure havlng to be dlsmantled for thi~; purpose.
: ,'' ~:
In thls rotary closure accordlng to the lnventlon, lt 1
pos6ible for only one slngle tractlon cable recelvl~g groove
to be provlded on the outer clrcumference of the wlndlng
pulley, and accordlngly the two free ends of the tractlon
cable are euch fastened on one of the two closure elements
whlch can be braced relatlve to one another, wh116t a cen-
tral longitudinal portion of the traction c~lble 18 loosely
passed tXrough the hub bore.
Accordlng to a further advantageous embodlment of the lnven-
tlon, the wlndlng pulley can have runnlng round it6 outer
clrcumference two tractlon cable recelvlng grooves whlch are
correspondlngly machlned lnto thl~: outer clrcumference of
the wlnding pulley in two planes whlch ars ~xially spaced
and lle parallel to one another. In thls case, at least for
one tractlon cable recelvlng groove there 18 provlded ~
dl~metral hub bore for a central longltudlnal portlon of the
tractlon cable to be passed through, and two di~lmetrally
~s~
: ` ~
- 4 - 21 ~ 3 1 ~9
opposlng tractlon cable holes in the houslng wall are co-
ordlnated wlth both tractlon cable recelvlng grooves. Thls
constructlon permits an arrangement and guldln~ of at least
one tractlon cable ln two tractlon cable recelvlng grooves
which lle parallel to one another, ~o that the wlndlng
pulley can take up a maxlmum of double the quantity of
traction cable in comparlson wlth a wlnding pulley with only
one slngle traction cable recelvin~ ~roove, whlch
considerably increases the reclprocal braclng region of the
clo6ure elements whlch are to be drawn together and can also
be released from one another agaln.
Whereas the known constructlons descrlbed ln the intro-
duction are provlded for speclal use on sports ~hoe~, the
design of the rotary closure accordlng to the lnvention
facilitates use which is not confined only to sports ~hoes
but can also be ad~pted to many other advantageous possible
applicatlons, such a8 for example varlous ltems of clothing
<e.g. gloves, partlcularly baseball or other sport~ ~loves,
belts, outer garments>, safety helmets, bags, cases? quick
closures for fastenlng container~ or other parts to blcy-
cles, etc. In each case, wlth the aid of the rotary clo~ure
<rotary ten~ionlng closure) accordlng to the inventlon
closure elements whlch can be braced relative to one another
can be braced quickly, and thl~ bracing can also be released
agaln quickly.
The rotary closure according to the inventlon wlll be
explalned in greater detail below with the aid of some
embodlment6 which are lllustrated in the drawings, in which:
Flgure 1 shows a vertlcal cro~s-~ection (approxlmately along
the llne I-I ln Flgure 2~ through a flrst embodlment of the
rotary closure accordlng to the invention, in which the
assoclated wlndlng pulley only has one single tractlon cable
recelvlng groove.
- 5 - ~113149
Flgure 2 shows a somewhat slmplifled horizontal sectional
view through the rotary closure, approxlmately along the
line II-II ln Flgure 1, with the wlnding pulley ln lts
startlng position;
Fl~ure 3 shows a similar horlzontal sectlonal vlew to that
of Flgure 2, in whlch the wlnding pulley has already carrled ~ -
out a partial turn;
Flgure 4 ~hows a horizontal sectlonal view through the
rotary clo~ure ln a varlant in whlch the traction cable
holes in the peripheral wall of the housing do not lle ~ :
dlametrally opposite one another;
Flgure 5 shows a vertlcal sectional view (approximately
along the llne V-V ln Flgure 6) through a second embodiment
of the rotary clo~ure ln whlch the windlng pulley has two
tractlon cable receivlng ~rooves and each receivln~ groove
t~kes up a central longitudinal portlon of the tractlon
cable;
Flgure 6 shows a slmplifled horlzontal sectlonal view
approxlnately along the llne VI-VI ln Figure 5;
Flgure 7 shows a slmllar vertical sectional vlew to that of
Flgure 5 (sectlon approximately along the line VII-VII in ~ :
Flgure ô> explalnlng a further embodlment ln whlch one
tractlon cable recelvlng groove takes up ~ central longltu- :
dln~l portlon and the second tractlon cable receiving ~roove
takes up the ends of the tractlon cable; :~
Flgure 8 shows a slmpllfled horlzontal sectlonal vlew
approxlmately along the llne VIII-VIII ln Figure 7;
Flgures 9 and ll ~hows ~chematic top vlews of particular
varlant~ of the wlnding pulley with gener~l posslble appli-
- 6 - 21~ 3 1 ~9
cations of the tractlon cable ~uides;
Flgure 10 shows a slde view of the wlndln~ pulley, approxi-
mately along the line X-X in Flgure 9.
The ~eneral construction of the fir~t embodlment of thl~
rotary closure according to the ~nventlon will be explained
with the aid of Figure 1.
Thl~ rotary closure contains as an essentlal part a winding
pulley 2 which is rotatably mounted in a housing 1 and on
whlch - preferably, ln the present case - one ~lngle
traction cable 3 can be wound on and unwound, the traction
cable being passed through traction cable hole6 or bores 4,
5 whlch are provlded in the perlpheral wall la of the hous~
lng 1. The traction cable 3 co-operates wlth two closure ~;
elements, not shown ln greater detall ln Fi~ure 1, whlch are
drawn toyether ad~u~tably but releasably by the rotary
closure and can be braced relatlve to one another thereby.
The rotary clocure also contains a rotary actuatlng spindle
6 whlch ls rotatably mounted in the centre of the hou~lng l ~ ~:
and ls ln rotary drlve connection wlth the wlndlng pulley 2
by way of a gearing arran~ement, preferably by way of a
planetary gear 7 wlth a sun wheel 8, planet wheels 9 and an
lnner gear rlng lO. In thls ca~e it ls also advantageous lf
ln a manner whlch is known per se the rotary actuating
spindle 6 bears a dlsconnectable coupling element lla of a
coupling ll which is provlded ln the sald drive connectlon
and can be dl~connected by axlal pressure actuatlon (arrow
13) of the rotary actuating shaft which c~n be exerted
agalnst the force of a compresslon spring 12. In thls dls-
connected state the wlnding pulley 2 is then freely rota-
tably movable, thus facllitatlng a rapid unwindlng of the
wound-on traction cable 3 and thereby a rapid release of the
¦ brMcing of the clo~ure elements. The Fiaid lower end 6a of
,, .
21~31~9
-- 7 --
the rotary actuatlng shaft 6, together wlth the coupllng
element lla borne thereon, protrudes axlally lnto a central
axlal bore 14 in the central hub 15 of the wlnding pulley.
As ls also known per se from the constructlons accordlng to
EP-B-393 380 and EP-A-412 290 whlch are explalned ln the
lntroductlon, the rotary drlve of the wlndlng pulley 2 :
occurs ln such a way that the rotary actuatlng splndle 6 1
rotated ln the desired dlrectlon by way of a rotary knob 16
whlch i~ rotat~ble relatlve to the houslng 1 and which for
example cover~ the housln~ 1 on lts upper face llke a cap,
~o that the coupllng 11 rotates the central sun wheel 8
whlch ls ln toothed engagement wlth several planet wheels 9
which ln turn are ln toothed eng~gement wlth a statlonary
inner gear rlng 10 and are gulded so as to be freely rota-
table on trunnlons 18 whlch are constructed flxed on the :~
upper, first outer face 2a of the wlndlng pulley 2.
Furthermore, followlng the known construction accordlng to ~:
EP-B-393 380 at least one ~top element for ln~-tance in the
form of a stop arm 17, or al~o two stop arms 17, can be ~ :
rotatably mounted in the houslng 1 coaxi~lly with respect to
the wlnding pulley 2 and on the lower, ~econd outer face 2b
of this wlnding pulley 2 opposite the couplln~ 11. After at
lea~t approxim~tely two revolutlon~ of the winding pulley
thls stop element ~stop arm 17> comes to rest on the houslng
1, 80 that the rotary movement of the winding pulley 2 18
correspondlngly llmlted in order to prevent overstralnlng of
the tractlon cnble 3.
Wlth a preferably cyllndrlcal shape, the wlndlng pulley 2 is
uccommodated and gulded in a correspondlng portlon of the
houslng 1 (as can be seen from Flgure 1>. Furthermore, lt
can be advantageou6 lf a trunnion 17a of the stop element 17
protrudes from below from the lower, ~econd outer face 2b of
the wlnding pulley a 6hort dl6tance lnto the axlal bore 14
- 8 - '~113~
of the wlndlng pulley hub 15. In thls case the ~top element
17 or one of the two ~top ele~ent~ 17 al~o has a ~econd
trunnlon 17b wh~ch 1~ dlsposed coaxlally wlth the flr~t
trunnlon protrudlng lnto the axial bore 14 and opposlte
thereto and engages ln a bearlng bore 19 whlch 1~ suitably
provlded ln a base wall lb of the housing 1.
Flnally, wlth regard to the general con~tructlon of the ~ :rotary closure lt ~hould al~o be mentloned that - as ln the
two known con~tructlons mentioned above - the closure also
contaln~ a releasable ratchet arran~ement 20 which 18 con~
structed for fixlng the rotary actuatlng shaft 6 and the :
wlnding pulley 2 when an adJustment of the rotary closure is
carried o~t.
A clrcular traction cable recelving ~roove 21 ls machlned
around the outer circumference of the wlndlng pulley 2,
whereln the axlal dlmenslon <wldth> cf the sald groove 18 ~:
slightly greater than the diameter of the tractlon cable 3
and the radlal dlmenslon thereof ls sufflclently great to be
able to take up a sufficiently large longltudlnal portlon of
the tractlon cuble 2.
A slgnlflcant ldea of the lnvention i~ applled here, whereby
a hub bore 22 which dlametrally traver~es the central hub
reglon <hub 15) of the windlng pulley 2 18 provlded ln the ::
plane of or at the helght of thls clrcular traction cable
receivlng groove 21. The tractlon cable 3 18 loosely passed
wlth a longltudlnal portion located between lts two ends, . .
that 18 to say wlth a central longltudlnal portlon 3a,
through the hub bore 22, l.e. the diameter of the hub bore
22 18 accordlngly only ~ust ~llghtly greater than the
dlameter of the tractlon cable 3, but preferably ~omewhat
smaller than the axlal width of the tractlon cable recelvlng
groove 21 <as Flgure 1 shows). Thls sltuatlon 18 ~180
lllustrated ln the horlzontal sectional vlew of Flgures 2
9 2113149
and 3.
Flgures 2 and 3 also show that the two outer mouth portlons
22a, 22b of the hub bore 22 increaslngly widen in the radial
dlrection in such a way that - when considered in a top vlew
of the windln~ pulley 2 ~Fi~ures 2 and 3> and ln the direc-
tlon of winding thereof <arrow 23) - thsy extend so that
they are curved backwards wlth the groove width <axlal
dlmension wlth respect to the wlndlng pulley 2> remalnlng
constant, as can be seen partlcularly clearly in Flgure 2 at
22a' and 22b'. This permlts a relatlvely smooth wlndlng on ~ -
of the central longltudlnal portlon 3a of the tractlon cable
3 in the transition from the hub bore 22 to the outer clr-
cumferentlal wall of the hub 15. The latter is clear from a
comparlson between the stsrtin~ positlon of the wlnding
pulley 2 in Flgure 2 and the poeltlon of the wlndlng pulley
2 ln Figure 3, ln which the winding pulley 2 has carried out
a flrst part-turn after the startlng position.
In the embodiment accordln~ to Flgures 1 to 3 the t~o
trsctlon cable holes 4, 5 ln the perlpheral wall la of the
housing are dlsposed in the same plane as the tractlon cable
recelvlng groove 21 and the hub bore 22, and they lle
approxlmately dlametrally opposlte one another. Thls con-
structlon ls sultable for very varied posslble appllcations
of the rotary closure accordln~ to the inventlon.
One varlant of the prevlously descrlbed construction is
lllustrated in Figure 4. Accordlng to thl~ the two traction
cable holes 4', 5' are also disposed ln the same plane as
the tractlon cable recelvlng groove 21 and the hub bore 22,
although they do not lle diametrally cppo~ite one another
but have a perlpheral spacing UA of les6 than 180-, prefer-
ably approxlmately 90, from one another. Thls can be
advantageou~ above all ln sports shoes, particularly ~ki
boot~, lf the rotary closure ls to be flxed for instance on
, : " ~ , , ,. .",,, ,;; -, :r : ,
-- lo- 21131~9
a so-called spoller.
In the embodiment of the rotary closure which 18 de~crlbed
above, ln whlch only one 5ingle tractlon cable recelvlng
groove 21 is provlded on the outer circumference of the
wlnding pulley 2, the two free ends of the tra~tion cable 3
are each fixed on one of the two closure el~ments which can
be braced relatlve to one another - and are not shown in
greater detail - whll~t the central lon~itudinal portlon 3a
of the traction cable 3 i~ passed loosely through the hub
bora 22.
A further embodlment of the rotary closure will be explained
wlth the ald of Flgures 5 and 6. Slnce the yeneral con-
structlon of thls embodlment largely corre~ponds ln lts
essentlal part~ to the general con~tructlon explalned ln
detall wlth the ald of Fl~ure l, the same parts are ldentl-
fled by the same reference numerale, ~o that a repeated
explanatlon thereof 18 unnece~sary. Thus thls embodlment
accordlng to Flgures 5 and 6 al~o comprises a houslntg 1, a
wlndin~ pulley 2 rotatably mounted thereln for wlnding on
and unwlndlng preferably of one slngle traction cable 3, a
rotary actuatlng shaft 6 rotatably mounted ln the centre of
the houslng 1, a gearlng arrangement, preferably ln the form
of planetary gear 7 for drivlng the windlng pulley 2, a
coupllng ll between the rotary actuatlng shaft 6 and the
planetary gear 7 a~ well ~ a ratchet arrangement 20 and at
least one stop arm 17 to limlt the rotary movement of the
wlndlng pulley 2.
A speclal feature of thl6 embodlment of the rotary closure
whlch 18 lllustrated ln Flgures 5 and 6, but also wlth the
ald of Flgures 7 and 8, may be sean above all in the fact
the the wlndlng pulley 2 has two clrcular tractlon cable
receivin~ grooves runnlng around ltc outer circumference
whlch can both be constructed sub tantially the same slze
\
3 1 ~ 9
and ln the manner explained wlth the aid of Figure 1. These
two tractlon cable recelvlng grooves 21, 21a are - cf.
Flgures 5 and 7 - machlned lnto the wlndlng pulley 2 (from
the outer clrcumference thereof) in two planes or at two
height~ which are axially spaced and lie parallel to one
another. In the construction according to Flgures 5 and 6,
one assoclated dlametral hub bore 22 or 22c respectlvely ls
provided for each of the two traction cable receiving
grooves 21, 21a. In thls case central longltudlnal portlons
3a or 3b respectively of the tractlon cable 3 are passed
through the two hub bores 22, 22c in such a way that on the
one hand the two ends 3c and 3d of this traction cable 3
located outslde the rotary closure and on the other hand an
outer loop of traction cable 3e formed by a longltudinal
portlon of tractlon cable located outside the housln~ 1 are
in closing en~agement with the closure elements, as fihown
with the ald of Figure 9. In compari~on to the flrst
embodlment explalned with the ald of Figures 1 to 3 (with
only one traction cable receiving groove 21>, the windlng
pulley 2 according to Flgures 5 and 7 <with two traçtion
cabls recelving grooves 21 and 21a> can take up approxi-
I mately double the length of tractlon cable 3, l.e. this
~ wlnding puiley 2 with ln each case to tractlon cable
i receivlng grooves has double the capaclty to recelve the
! traction cable by comparison wlth the embodlment according
to Figure 1.
::
j ~ Thus in the embodiment according to Flgures 5 and 6 central
longltudinal portlons 3a, 3b of the traction cable 3 are
loosely pas~ed through the as~oclated hub bores 22, 22c, and
ln the sume plane or at the same helght as the tr~ction
cable recelvlng groove 21 and 21a on the one hand as well as
the hub bore 22 and 22c on the other h~nd two traction cable
holes 4, 5 can be disposed ln each case in the perlpheral
wall of the houslng la ~o as to lie diametrally opposite one
another; however, the diametrally opposing traction cable
- 12~ l3~9
holes 4, 5 can also be provided as approxlmately vertically
extending slots ln such a way that the two lon~ltudinal
portlons of tractlon cable 3a, 3b whlch run over one another
are passed to~ether in each case throu~h one slot. The
latter statement also applles approprlately to the embodi-
ment accordln~ to Fi~ures 7 and 8.
A substantlal difference between the two embodiments accor-
dln~ to Fl~ures 5 and 6 on the one hand and Flgures 7 and 8
on the other hand may be seen in the fact that accordlng to
Flgures 7 and 8 a diametral hub bore 22 for loose passa~e of
a central lon~itudinal portlon 3a i8 provided only for one
lower tractlon cable receivin~ ~roove 21, whereas the two
ends 3c and 3d of the traction cable 3 are flxed ln the
wlndlng pulley hub 15 ln the plane of or at the height of
the upper second tractlon cable recelvln~ ~roove 21. Thls
flxln~ can be achleved for example by provldin~ corres-
pondln~ bllnd bores and throu~h bores - as lndicated ln
Flgure 8 - in the wlnding pulley hub 15 whlch receive the
outermost end portlon~ of these two cable ends 3c ~nd 3d, so
that these outermost end sectlons can then be flxed in the
assoclated hub bores preferably by ultrasonlc welding, that
ls to say ln an extremely slmple manner, on the hub 15,
particularly when the tractlon cable 3 ls a correspondln~
pla~tlc cable and the windln~ pulley 2 or the hub 15 thereof
1~ a correspondlng plastlc part.
As can also be seen from Fisures 7 and 8, by the construc-
tlon chosen there out~lde the housln~ 1 two outer loop~ of
tractlon cable 3e and 3f are formed whlch - as lndlcated ln
Flgure 11 - can be ln enga~ement wlth the corresponding
closure elements, the points of appllcation whereof are
lndlcated at 24 and 25 (slmllar polnts of appllcatlon 24, 25
of correspondln~ closure elements are aleo shown ln Flgure
9> .
- 13- 21:1314~
Also the hub bores in the winding pulleys Z of the embodi-
ment accordlng to Fi~ures 5 to 8 can be shaped in the same
way 8S iS explalned in greater detail wlth the ald of
Figures 2 and 3.
Whereas in the embodlments according to Figures 5 to 8 the
longltudlnal portlons of tract~on cable <including the
correspondin~S ends> whlch are inserted lnto the two traction
cable recelvlng grooves 21, 21a lylng one above the other
run approximately parallel to one another in the starting
posltlon of the wlnding pulley ~cf. Figure ~>, Fi~Sures 9 to
11 show constructlons accordln~s to whlch the longltudlnal
portlons of tractlon cable ~e.~s. central lon~Sltudinal
portlons 3a, 3b ln Flgure 10> whlch are lnserted lnto the
two traction cable recelving grooves 21, 21a lylng one above
the other cross over one another in the startlng positlon of
ths wlndin~ pulley, and preferably run approxlmately at
rlght angles to one another. In thls case the con~i;tructlon
accordlng to Figures 9 and 10 le eubstantially ad~pted to
the example according to Figures 5 and 6, elnd the co~struc-
tion accordlng to Flxure 11 18 sub~;tantlally adapted to the
ex~lmple ~Iccordlng to Flgures 7 and 8.
Reference may be made again to the two embodlments accordlng
to Fi~5ures 5 and 6 on the one hand and Figures 7 and 8 on
the other hand.
If one conslders first of all the constructlon and ~rrange-
ment, ~:hown in Flgures 5 and 7 and aleo ln Fl~Sure 1, of the
coupllng 11 ln the transmis~lon connectlon between the lower
end 6a of the rotary actuatlng shaft 6 and the planetary
ge~r 7, then the dlsconnectable coupllnE~ element <e. g. z~
claw coupllng part) lla wlth the lower splndle end 6a pro-
Jects somewhat from the upper outer face 2~1 of the wlndlng
pulley 2 lnto the upper end portlon of the axi~l bore 14 of
the wlnding pulley hub 15. Between the underside of the
-14- 2113~9
couplin~ element la and the longitudinal portlon <3a ln
Figures 1 and 7 and 3b in Figure 5~ of the tractlon cable 3
l~medlately adJacent to thls couplin~ element lla there must
be an axial clearance (s ~n Figure 5) ln the axial bore 14
whlch ls so great that the lower shaft end 6a to~ether wlth
the coupling element lla can be pushed axlally downwards
lnto the axlal bore 14 sufflciently far for the couplin~ to
be able to be disconnected ln the deslred manner lf
necessary. Accordin~ly the axial length of the end portlon
of the axlal bore 14 whlch receives the lower ~haft end 6a
and the couplln~ element lla from the correspondln~ outer
face 2a of the wlnding pulley 2 to the nearest hub bore 22
or 22c - according to the arrow 13 - must correspond at
least to the maxlmum pressure actuiation piath ~correspondlng
to the clearance s~ plus at least the couplin~ element lla
or the thlckness thereof. Since in the embodlment according
to Flgures 5 and 6 two central longltudlnal portlons 3a, 3b
travsr~e the wlndln~ pulley hub, whereas in the embodlment
according to Flgures 7 and 8 only one single central lon~l-
tudlnal portion 3a traverses the windlng pulley hub 15, the
axlal dlmenslon or thlcknes~ of the w~ndlng pulley 2 ln the
example accordln~ to Fl~ures 7 iand 8 can be kept &maller
than ln the case of the example according to Flgures 5 and
6, ~8 a comparlson of the lllustratlons ln Figurei 5 and 7
makes clear.
Reference should also be ~ade ln this connectlon to the fact
that the trunnion 17a of the stop element 17 whlch protrudes
lnto the ~xlal bore 14 ln the windlng pulley hub 15 only
proJects lnto thls bore so far that ln each case the hub
bore 22 lylng nearest thereto or the lower hub bore 22 is
freed.
With regard to the construction of the tractlon cable holes
4, 5 lt should al~io be mentioned that - ~8 lndicated ln
Fl~ure 2 at 4a and 5a - these can have simllnr curved
~ ` - 15- 2 1 1 3 1 4 9
portions to the mouth portions 22a, 22b of the hub bores
(Fi~ures 2 and 3> in such a way that during the wlndln~
operation the traction cable 3 can be ~uided or deflected
along the curved hole portlons 4a, 5a lar~ely wlthout
klnkin~.
As can be deduced from the described embodiments, the use of
only one slngle tractlon cable in this rotary closure or
rotary tensionln~ closure is particularly preferred. How-
ever, in the descrlbed embodlments it is equally possible to
provlde at lest two tractlon cables ln a correspondinE
manner, and for example in the case of two tractlon cable
receivin~ ~rooves one tractlon cable can be co-ordlnated
wlth each of these recelvin~ ~rooves of the wlnding pulley.
Thls rotary closure accordlng to the lnventlon can be pro-
duced from any sultable materlal. Thus at least the
prlnclpal parts of thls rotary closurs can be made from
metal, preferably relatlvely wear-reslstant ll~ht metal.
However, ln a partlcularly preferred constructlon at least
the prlnclpal part6 of thls rotary closure are made from
pl-stlcs materlal, preferably from an impact-reslstant and
wear-res~stant plastlcs material.
In each case thls rotary closure accordln~ to the lnvention
can be adapted extremely well to very varled appllcatlons,
and it 18 a180 dlstln~ulshed by a partlcularly flat and
compact constructlon.
