Note: Descriptions are shown in the official language in which they were submitted.
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The lnvention relates to pre.ss frames and more particularly to
portable vulcani~er presses used for the repairing, or for joining of the
ends of endless conveyer belts and the like. Such frames have an upper
pressure transverse member or girder, a lower pressure transverse member or
girder, with through bolts ~oining the two members at their ends,'and a
row of power cylinder piston assemblies disposed in the upper member.
Presses which are the subject of this disclosure,even though "Vulcanization"
may not strictly be involved are alsa those, not only for rubber conveyer belts
but also for plastic conveyer belts. In general all vulcanizer presses of these
types are furnished with two press frames of the construction described i'
which act upon uninterrupted press plates (cf. German Auslegungsschrift,
DT-AS 2,029,853). The pressure girders are thus stressed in operation,as
end beams'supported on two supports,and statically, therefore, they can be
regarded as beams.
In known press frames of the type described (cf. also German
Offenlegungsschrift DT-OS 2,2~5,525) each transverse member or pressure ¦
girdèr is made up essentially of two U-profiled beam sections with a long U- ~
bottom and short U-sides. In thè assembled condition the U-bottoms are }
arranged vertically with the U-sides directed outwards. Threaded bolts
join the two U-beams to form a pressure girder, which beams, in general
have s~eps against which, for the upper pressure'girders, the press cylinder
piston assemblies are supported. The press cylinder piston assemblies
themselves possess pressure feet, and the pressure feet cooperate with a
continuous pressure rail, which ls an independent structural part which is ~ ~
not fixedly joined to the press frame. Known press frames, therefore, are ~ ''
expensive to manufacture and assemble, and moreover have static disadvantages.
Although the two U-profile beams of every pressure girder are joined by
threaded bolts, these two U-beams function statically only as two indepen-
dent beams, and not in functional combination. Consequently, such pressure 1 '
girders in known press framas must be of comparatively heavy design in
order to withstand the stresses involved, although in the art of statics, '~
especially in bridge construction, so-called box girders are also known
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(these are girders possessing a box-shaped cross-section). The design of
press frames of the type herein considered has not previously been influ-
enced by the existence of such box girders.
The present inventors have addressed themselves to the problem of
simplifying a press frame of the type described, both from the standpoint
of manufacture and assembly, and9 of developing a superior structure for
resisting the stresses involved in use of such frames.
As here described in a press frame of this type the pressure
members are designed as unit profiled beams with a box girder structure,
and with each profiled beam comprising two side walls with outwardly bent
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stiffening flanges joined to the beams, and with two box webs joined to
said side walls on the insides situated at box distance from one another
- The side walls each possess an extension
part projecting above and below the box webs, and between the lowex exten-
sions of the side walls is disposed a continuous pressure rail, of which
the press cylinder piston assembLies associated therewith pass through ',
holes in the box webs. It has been determined that in a press frame of
this type a box girder structure can be used for the pressure girders,
provided the side walls of the box have the described extensions and these
stiffening flanges. There is then no operable detriment in the face of
operational stresses from the static viewpoint that the box webs possess
holes in which the press cylinder piston assemblies are accommodated.
Because the girders are formedof box cross section as units with favourable
strength and stability behaviour, even under extreme stresses, the girders
can be made up in comparatively light weight material. The girders may
be welded together from the described structural parts. However, they also -'
may be constructed (with side walls, stiffening flanges and box webs) from
a light metal alloy if desired by extrusion. ~egardless of the material -
employed, or the method by which the box girder structure is produced, the
stressabil~ty in a press frame will be optimized if the stiffening flanges
have about twice the thickness of the side walls, and if, moreover, the
extensions of the side walls upwards aFe equal to about half the distance
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apart of the box webs. The size of the downwards extensions of the side
walls is chosen so that the integration of the pressure rail to the press
cylinder piston assemblies is possible~ For this purpose the downward
extension of the side walls should, at a maximum, be about a distance equal
to the distance apart of the box webs. In general, an arrangement is
preferred in which the continuous pressure rail is fitted in the upper
pressure girder between the side walls - with sufficient clearance for
movement. Under extreme bending stress of the pressure girders, supporting
of the side wall extensions against the pressure rail can take place, thereby
enhancing the stability. The side walls may bulge laterally in the region
between the box webs.
Expediently, the pressure rail itself may comprise a foot section
of extruded, light metal alloy and a compression resistant, bar-shaped head
section resting thereon, which the press cylinder piston assemblies in turn
engage. In order to save weight, the foot section may possess longitudinal
tunnels and sloped upper sides. The head section may be made, for example,
as a strip of flat-bar steel riveted to the foot section. In a preferred
embodiment, the head section is attached directly to the pistons or the
piston rods of the press cylinder piston assemblies with suitable connecting
means, such as in the form of bearing cradles.
Specific embodiments of the invention will now be described with
reference to the accompanying drawings in which;
Figure 1 is a perspective drawing which shows two press frames with
cooperating press plates; I -
Figure 2 is a section along the line A-A of Figure 1, substantially
enlarged;
Figure 3 is a cutaway plan view of Figure 2; and
Figure 4 ~s an alternative embodiment similaE to Figure 2.
The press frames represented in Figure 1 are incorporated in a
vulcanizing press which serves for the repair of, or for Joining the ends of,
endless conveyer belts. The frames have a lower press plate 1 and an upper
press plate 29 between which the conveyer belt 3 to be processed is placed.
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Each individual press frame comprises an upper pressure girder 4, a lower
pressure girder 5 and connecting bolts 6 between the girders 4, 5.
A row of press cylinder piston assemblies 7 is situated in the
upper pressure girder 4.
Further details are apparent from Figures 2 and 3. It will be seen
that the pressure girders 4, 5 are fabricated as unit profiled beams of box
girder structure. Each beam comprises two separated side walls 8 with
attached outwardly bent upper and lower stlffening flanges 9. Box webs 10
are attached on the inside of side walls 8, separated from each other at
box distance and joining walls 8. In addition, side walls 8 each possess
upper and lower extensions lI, 12 projecting upwardly and downwardly past
box webs 10. Between downwardly projecting extensions 11 of side walls 8
there ls a continuous pressure rail 13. Press cylinder piston assemblies 7
cooperating with the rail 13 are accommodated in holes 14 of~box web 10.
It is preferred that the box profile beams with side walls 8,
stifening flanges 9 and box webs 10 constitute a unit produced by extrusion,
and preferably made of light metal alloy. Stiffening flange 9 has about
twice the thickness 15 of side walls 8 and box webs 10. The top extension 12
o side walls 8 has a height of about half the distance apart 16 of box webs
10, and hence is about half the height of the box. The lower extension 11 1 -
of side walls 8 has a height, at a maximum, of about the distance apart of
box webs 10. In the upper beam 4, continuous pressure rail 13 fits between
side walls 8 with only a slight clearance for movement. Figure 4 indicates ¦
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;~ that side walls 8 are furnished with lateral bulges 25 between box webs~10.
In the embodimen~ represented, bulge 25 corresponds in thickness to that of
side walls 8.
In Figures 2 and 4~ pressure rail 13 comprises a foot section 17 and ~;
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a head section 18. Foot section 17 is formed by extrusion from a light
- metal alloy. The head part 18 is compression reslstant, and consists, for I -~
3û example, of a strip of flat-bar steel. Foot part 17 absorbs all stressesadequately if it possesses the hollow structure as formed by the tunnels 19
and upper sloped sides 20 shown in ~igure 2. The head section 18 is
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connected directly to pistons 21 or piston rods 22 of the press cylinder
piston assemblies by way of suitable connecting means in the form of bearing
cradles 23. Pressure rail 13 is slung with the aid of springs 24 from the
lower box webs 10.
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