Note: Descriptions are shown in the official language in which they were submitted.
The invention relates to a device f'or connecting
a hose end to a connecting sleeve, with - as an integral
part of' the connecting sleeve - a bush f'or pushing
on the hose end, with a hose clamp comprising at
least two shell parts which surrounds the connecting
sleeve, with a tension lever Lock, the tension lever
of' which is linked to one shell part and the spring
of' which connects the tension lever to an adjacent
shell part, and wi-th an external ring-shaped rim
on the connecting sleeve, wherein the shell parts
are provided on their one side with inwardly projecting
holding f'langes which engage over the ring-shaped
rim, and on their other side with clamping f'langes
which press the hose onto the bush.
With such a device until now the connecting sleeve
and the hose clamp were connected by a holder extending
in the radial direction, the one end of' the holder
engaging a hinge pin connecting the shell parts,
and the other end being placed on the connecting
sleeve next to the ring-shaped rim. To this end
the holder is provided with a bore, so that it can
be pushed over the bush up to the ring-shaped rim.
The securing on the side f'acing away f'rom the ring-
shaped rim takes place with the aid of' a spring
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ring.
Since it is important to connect -the hose clamp
to the connecting sleeve in such a way that it cannot
be detached, until now the technical ef'f'or-t involved
has been endured. However, this has made the manuf'ac-
ture and installation considerably more expensive.
I-t is proposed according to the invention that the
outside diameter of` the ring-shaped rim is adapted
to the inside diameter of' the holding f'langes in
such a way that, also when the -tension lever lock
is open, the hose clamp is prevented f'rom pulling
of'f~ the bush by means of' the ring-shaped rim.
A radial holder as a connection between the connecting
sleeve and hose clamp is now no longer required.
Also when the tension lever lock is open, the shell
parts, the tension lever and the spring f'orm a closed
ring. When according to the proposal of' the invention
the diameters are suitably adapted to one another,
also this ring cannot be pulled of~f' the connecting
sleeve over the bush. In the opposite direction
a pulling of'f' is anyway not possible, since the
connecting sleeve is generally provided, at its
~Ztji951~
end f~acing away f`rom the bush, with an external
hexagon, the outside diameter of' which at any rate
f`orms the largest outside diameter of' the connecting
sleeve.
Whereas, theref'ore, until now the ring-shaped rim
solely served, together with the holding f'langes,
to prevent the hose end positioned on the bush and
the hose clamp f'rom pulling of'f', now the ring-shaped
rim can ensure this f'unction also when the hose
clarnp is open, provided that the ring f'ormed by
the shell parts and the open tension lever lock
is closed. To keep this ring closed, -the connec-tion
between the spring and shell part may under no circum-
stances be an easily detachable connection. Such
a connection is known, for example, in the form
of~ahook f~ormed by bending over the end of' the spring
and hooking it into a slot in the shell part. Within
the f'ramework of' the invention a connection should
be used which is dif'f'icult to loosen, but pref'erred
is an undetachable connection.
According to a f'urther proposal of' the invention
the latter can be produced in an advantageous manner
in that the spring end engaging with the shell part
12~
is stuck f'rom the outside through a slot in the
shell part, and is dimensioned and shaped such that
also when the tension lever locLc is open it cannot
get out of' the slot.
This can be achieved, f'or example in that the spring
end is made suitably long and is introduced into
the slot bef'ore the other spring end is connected
to the tension lever. In that case, af'ter producing
the latter connection the overall length of' the
spring is too great to permit the spring f'rom getting
out of' the slot.
In a f'urther embodiment of' the invention it is proposed
that the inside diameter of' the holding f'langes
is smaller than that of' the clamping f'langes.
This means that the holding f'langes of' the hose
clamp extend radially particularly f'ar inwards,
so that the desired securing ef'f'ect can also be
obtained with a smaller outside diameter of' the
ring-shaped rim. A smaller outside diameter of' the
ring-shaped rim is advantageous, since as a result
thereof' the maximum outside diameter of' the connecting
sleeve can as a whole be reduced.
Generally, the bush of' such a connecting sleeve
is provided with a bead. The clamping f'langes on
the hose clamp must press the hose end onto the
bush, if' at all possible directly next to this bead.
As a result thereof' the hose is in a small section
def'lected f'rom the axial into the radial direction
and back again in-to the axial direction. This results,
however, in a considerable improvement in the sealing
ef'f'ect. However, this is dependent on the clamping
f'langes of' the hose clamp being positioned very
accurately, seen in the axial direction.
Until now this positioning also had to be ensured
with the aid of' a holder extending in the radial
direction.
However, according to a f'urther proposal of' the
lnvention this can be achieved in a f`ar simpler
manner when the connecting sleeve is provided with
an annular groove, which on its side f'acing the
bush is delimited by the ring-shaped rim, and when
the groove width is dimensioned such that the holding
f`langes engaging in the annular groove, and accordingly
also the hose clamp, are f'ixed in the axial direction.
Since now according -to the invention the ring-shaped
rim f~orms part of~ the annular groove, a f'ixing of
the hose clamp in relation to the bush becomes possible
in both axial directions. The axial position of
the clamping f'langes can accordingly be ensured
with particularly great accuracy.
Since this measure can also be applied advantageously
when a securing of' the hose clamp in relation to
the connecting sleeve does not take place by means
of' the ring-shaped rim and the holding f'langes,
pr,otection is claimed f'or this measure independent
of' the realisation of' the f'eatures contained in
claim 1.
Furthermore it is advantageous according to the
invention when the groove wall opposite the ring-
shaped rim is inclined towards the base of' the groove
and the ring-shaped rim. As a result thereof' the
outer region of the annular groove is broader, f`acili-
tating the entering of~ the holding f`langes intothe annular groove.
In the f'ollowing a pref'erred embodiment of' the invention
is described in greater detail with reference to
a drawing. Shown are:
Fig. 1 a cross-section through the device when
the tension lever lock is closed;
Fig. 2 a longitudinal section along the line
II-II ln Fig. 1;
Fig. 3 another longitudinal section along the
the line III-III in F:Lg. 1;
Fig. 4 a cross-section through the device
when the tension lever lock is open.
A bush 11, f`orming part of' a connecting sleeve 12,
serves to push on a hose end 10. At its end f'acing
away f'rom the bush 11 the connecting sleeve 12 has
a threaded bore 13, into which a piping piece or
another connecting part can be screwed. In this
area the outer periphery of' the connecting sleeve
12 f'orms a hexagon.
Between this area and the bush 11 the connecting
sleeve 12 has an annular groove 14, which on its
side f'acing the bush 11 is delimited by a ring-shaped
rim 15. Whereas the side wall of' the annular groove
14 f'ormed by this rim 15 lies in a radial plane,
the opposite groove wall is inclined in such a way
that the width of' the groove decreases in the direction
of~ the base of' the groove.
The connecting sleeve 12 is surrounded by a hose
clamp which is f'ormed by two shell parts 16 and
17. The latter are connected at one end by means
of' a pivot pin 18, while at the opposite end a tension
lever lock is provided. This consists of' a tension
lever 19 and a spring 20. The tension lever 19 is
f'astened to the shell part 17 by means of' another
pivot pin 21, whilst the one end of` the spring 20
is connected to the tension lever 19 by a pivot
pin 22. The shell part 16 has a slot 23 through
which the other end of' the spring 20 extends. This
end is bent roughly into a Z-shape. The spring 20
is dimensioned and.shaped such that, when installing
the device, it is f'irst of' all introduced with its
bent end into the slot 23, and only then it is f'astened
to the tension lever 19 by means of' the pivot pin
22. Then the ring f`ormed by the shell parts 16 and
17, the tension lever 19 and the spring 20 can no
longer be opened, provided that no undue f'orce is
applied.
The shell parts 16 and 17 are provided on one side
with the clamping f'langes 24 which, when the tension
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lever lock is closed, press the hose end 10 onto
the bush 11. This pressing on takes place directly
behind a bead 25 f'ormed on the bush 11.
On the opposite side the shell parts 16 and 17 have
holding f'langes 26 which, when 'the tension lever
lock is closed, engage in the annular groove 14.
Since the ends of' the shell parts 16 and 17 overlap
in the region of' the hinge pin 1~, and the hose clamp
has a rela-tively large axial dimension there, in
this region contact will f'irst of' all be established
against the inclined groove wall, which can be- noted
in particular f'rom Fig. 3. However, the same also
applies to the diametrically opposite region in
which the tension lever 19 is f'astened. In any case,
during closing of' the tension lever lock the holding
f'langes 26 are pressed in the direction of' the ring-
shaped rim 15 whilst they enter the annular groove
14. This ensures accurate positioning of' the clamping
flanges 24 in relation to the bead 25.
The inside diameter of' the holding f'langes 26 is
smaller than that of' the clamping f'langes 24. This
permits a corresponding reduction of' the outside
diameter of' the ring-shaped rim 15. Nevertheless,
;l
due to the adaptation to one another of' these diameters
it is ensured that the holding f'langes 26 also still
engage behind the ring-shaped rim 15 when the tension
lever lock is open, so that the hose clamp cannot
be pulled of'f' in the direction of' the bush.
As can be noted f'rom Fig. 1 and 2, the spring end
stuck through the slot 23 in the shell part 16 can
also be used f'or the f'ollowing: when closing the
tension lever 19 f'rom the position shown in Fig.
4, in the course of' this closing movement the spring
end will come to rest or be pressed onto the hose
end 10. Whereas until now the hose clamp could roughly
turn freely in relation to the connecting sleeve
12, there now occurs f'riction between these parts
which reduces the relative ability to turn. However,
as a result thereof' the closing of' the tension lever
19 during the last part of' -the closing movement
is f`acilitated, seeing that the hose clamp cannot
turn around the connecting sleeve 12, or can only
do so to a limited extent 9 SO that it of'f'ers greater
resistance to the closing movement of' the tension
lever 19.
