Note: Descriptions are shown in the official language in which they were submitted.
The present invention relates to a telescopic belt con-
voyeur comprising a plurality of above each other arranged and
into and out from a supporting housing extendible and retractable
and slid ably mounted belt conveyor portions.
Such a type of belt conveyor can have a housing which
is fixed positioned and the outmost conveyor end can be slimed
out from the house into the cargo compartment of a vehicle to
enable an easy loading and unloading of parcels or other objects
of confined dimensions in-to or from such a cargo compartment.
The housing can also be mounted on a cart foe. hinged at the rear
end unto a supporting stand upon the cart and supported upon the
cart by a pneumatic or hydraulic cylinder means at the front end
of the housing thus enabling the telescopic belt conveyor to
establish an oblique loading respectively unloading pathway unto
or from a higher or lower positioned cargo compartment of a cargo
vehicle, etc.
The present invention provides a telescopic belt con-
voyeur which being of very sturdy nature also is comparatively cheap to manufacture and within which the number of movable parts
is kept very low.
The present invention also provides a telescopic belt
I conveyor which besides possessing the above-mentioned advantages
also, in a cheap manner, effectively can be controlled from the
front end of the belt conveyor thus enabling a manipulation of
the belt conveyor by a person being situated deep within a large
cargo compartment, foe. of a vehicle, or deep within a store
room, etc.
Furthermore, the present invention provides a tote-
scopic belt conveyor in which the main connecting and mounting
parts with a minimum of rearrangement can be utilized for tote-
scopic conveyors comprising different numbers of slid able belt conveyor portions.
According to the present invention there is provided a
telescopic belt conveyor comprising a plurality ox slid ably
mounted belt conveyor sections arranged above each other, said
sections being extendible and retractable from and into a sup-
porting housing and sharing a guide means for a common conveyor belt which in each section comprises at least two conveyor belt
guiding rolls, of which one roll is positioned farther out in the
section than the at least one other roll which is positioned at a
length at least equal to the section extension length behind the
first-mentioned roll or the section; a common drive means for
driving a driven tackle means, said driven tackle means including
at least one tackle guide direction changing means and being
drivable connected with an extendible and retractable belt con-
voyeur section which is above an intermediate section of said belt
conveyor sections and with the supporting housing driving the
extension and retraction of said extendible and retractable belt
conveyor sections; a second undriven tackle means having one end
connected to the inner end of the outermost of said belt conveyor
sections and another end connected to -the supporting housing, the
common drive means for the driven tackle means being positioned
at the rear end portion of said intermediate section of said
extendible and retractable belt conveyor sections, and each of
said tackle means comprising at least one flexible portion and at
least one drive direction changing means whereby at least two
belt conveyor sections can be provided and can be extended and
retracted by said common drive means, said driven tackle means
and said undriven tackle means.
Thus, in the telescopic conveyor according to the pro-
sent invention the belt conveyor sections comprise one common
conveyor belt or along a common pathway run conveyor belts being
within each belt section led over two conveyor belt guiding
rolls, of which one is positioned at the front end and the other
in spaced relationship at least with the extension length behind
the first of the two rolls within each conveyor belt portion and
a common drive unit for the performing of the extending and
retracting telescopic movements is positioned behind the conveyor
belt rolls of the telescopic movable portions of the telescopic
belt conveyor.
A drive unit within such a telescopic conveyor which
fulfill the purpose of simplicity and possibility of application
in connection with more such slid able mounted belt conveyor sea-
lions comprises two or more lengths of belt or chain portions of
which at least one length has one end connected to the inner end
of the outmost belt conveyor portion and the other end connected
to the outer end of the inmost of the belt conveyor portions and
which length is driven by a belt or chain drive unit positioned
at the rear portion of one of the intermediate extendible and
retractable belt conveyor portions and which length is led over
guide direction changing means respectively positioned at the
opposite ends of the belt conveyor units if more such are present
below and above the drive unit carrying belt conveyor portion to
achieve said fastening of the drive belt or chain for the tell-
scopic movements and in that at least one further length of belt
or chain undriven at its two ends is connected as the just-men-
toned drive belt or chain length unto the same or in the vial-
nit of the connecting positions Hereford and being led over
guide direction changing means positioned at, compared hereto,
opposite ends with regard to the corresponding means for the
aforesaid drive belt or chain length.
In one embodiment of the present invention the conveyor
comprises activating circuit means associated with the drive
means for the telescopic movement of the conveyor, and locally
operable means positioned at the outmost end of the outermost
extendible and retractable belt conveyor section for activating
the circuit means. Suitably the supporting house has a free
spaced lower and rear end portion comprising at least one tension
roll for the common conveyor belt. Desirably said driven tackle
means is drivable connected with the outermost extendible and
retractable conveyor section and with the supporting housing for
I
driving the extension and retraction of said extendible and
retractable belt conveyor sections.
Further advantages according to the present invention
become evident from the following more detailed description of a
preferred embodiment according to the invention under reference
to the accompanying drawing, in which:-
jig. l illustrates in perspective a telescopic belt
lo conveyor having two ~xtendable and one fixed belt conveyor port
lions embodying the present invention;
Fig. 2 shows the same as Fig. 1, but in a modified
embodiment;
Fig. 3 illustrates a vertical lengthwise cut through
any of the embodiments according to Fig. 1 or Fig. 2 showing the
essential internal elements within the conveyor;
Fig. 4 illustrates the same as Fig. 3, but shows only
the arrangement of the common belt for the three belt conveyor
portions; and
Fig. 5 illustrates the same as Fig. 3, but shows only
the arrangement of the drive unit for driving the telescopic
movements within the conveyor.
Fig. l and Fig. 2 of the drawing illustrates in the
perspective two embodiments of a telescopic belt conveyor accord-
in to the present invention, namely comprising an outmost belt
conveyor portion 1 carried by an intermediate belt conveyor port
lion 2 which again is carried by a belt conveyor portion housed
within a fixed housing 3. The housing can thus be fixed, but can
as earlier mentioned also be arranged on a supporting cart, etc.
The front end 4 of the telescopic belt conveyor carries a box 100
which can house switches for the operations of the belt end of
I
5~9
the telescopic movements of the telescope. The switches can thus
be placed in series or in parallel or be switched, by a switch
panel positioned anywhere else, out or in, in proportion to the
control circuit for drive motors of conventional type used to
drive the belt or the
- 3b -
drive unit for driving the telescopic movements and itch
drive means are described in more detail as foliages. The
box 100 of fig. 1 or fig. 2 can via a cable housed upon
a cable reel positioned in the conveyor housing 3 stay in
connection with the mentioned control circuits. The cable
can be as well an electric cable or a pneumatic or hydra-
fig connection cable or other well known cable typos to be
used for the purpose.
The conveyor carries an endless belt 5 which can be
driven by any roller carrying the belt. In case of the em-
bodiment shown in lengthwise cross section in fig. 3 and 5
the belt is driven by roll 6, within which a drive motor of
well known type is positioned. The main feature of the con-
voyeur is that one common belt is used for all the telesco-
pie belt conveyor portions 1, 2 and 3. Further such belt
conveyor portions can be added as earlier mentioned as two
additional rolls are added each time or the carrying of
the common belt I namely two additional rolls per belt
conveyor portion. Only two rolls are thus required, but
in case of especially heavy cargo to be handled by the
conveyor evidently further belt supporting rolls may be
added, but for general use the remarkable is that no more
rolls than indicated have to be used.
The drive unit for the performing of the telescopic
movements is illustrated in fig. 3 and fig. 5. The ad van-
tare according to the invention is that the drive unit mow
ion for these movements also is common for all the employed
belt conveyor portions, the drive motor is designated 31.
It may be an electric motor just as well as the drive motor
for the belt may be it. But use of other motor types such
as pneumatically or hydraulic motor types is without further
modification generally possible. The motor 31 drives
through some kind of transmission foe. via a chain 33 and
sprockets 32 and 34 a drive wheel or sprocket 10 a drive
belt or drive chain 9 having in case of the shown embody-
mint three sub lengths PA, 9B and 9C together forming the
/ 5
complete necessary drive length which in the hollowing
without further reference is designated 9. An other undoer-
Yen length of belt or chain in complete also without fur-
then reference designated 8 comprises according to fig. 3
and fig. 5 ox the drawing two sub lengths PA and 8B. The
one end of the lengths 8 and 9 in general are connected to
the housing portion 3 of the belt conveyor as shown at the
front end of the housing 3, whereas the other end of the
lengths 8 and 9 not too far from each other are connected
unto the outmost extendible belt conveyor portion 1. When
the motor 31 rotates the one or the other way round the
intermediate belt conveyor portion 2 shown carrying the
drive motor 31 slides itself out or in in proportion to
the housing 3, and whenever the friction sliding friction
not is too high between the belt conveyor portions 1 and 2
the belt conveyor portion 1 is extended or retracted in
proportion to the belt conveyor portion 2 simultaneously.
A sprocket 90 or other suitable guiding means situated upon
the intermediate belt conveyor portion 2 may be comprised.
It serves the purpose of maintaining the operational guide-
directions of the two sub lengths PA and 9C in proportion
to the telescopic movements whereby the drive belts or
chains 8 and 9 are kept reasonably tight during the tote-
scopic movements and therefore also during periods of use
and rest of the conveyor.
According to fig. 3 and fig. 4 the common transport-
lion belt 5 is run over rolls 6, which is the drive roll,
and rolls 12, 13, 14, 15, 16, 17 and 18. The rolls 12 and
13 are situated upon the belt conveyor portion 1, the rolls
14 and 15 upon the drive motor carrying belt conveyor port
lion 2 and the rolls 16, 17 and 18 inclusive roll 6 are
situated within the housing portion 3. Theoretically the
rolls 17 and 18 could be omitted, but they serve -the pun-
pose as tension keeping means for keeping the belt 5 in a
suitable stretched condition, thus 29 designates a screw
means to adjust the position ox roll 17.
The mechanical spacing between the two rolls of each
belt conveyor portion, i.e. between rolls 13 and 14 and
between rolls 14 and 15 of -the movable portions, should be
so that the spacing is larger than the maximum extension
travel of each of the single belt conveyor portions. With a
roller arrangement as shown the belt 5 remains suitably
stretched irrespective of the actual extension position of
the outmost belt conveyor portion 1.
The drive motor 31 may be supplied by a cable connect
lion wound upon a cable reel, and by means of the shown
structure according to the present invention the two men-
toned cable reels may be positioned foe. on the same reel
axis positioned in the housing 3 at the rear of the drive
motor 31 and in front of the drive roller 6.
The single extendible belt conveyor portions 1 and 2
may slide in simple guide rails. The mounting and friction
may be achieved for better performance by inserting sup-
port rollers 20, 21, 22 and 23 and possibly also foe. by
rollers on the axis common with the guide means 80.
To enable a possibility of adjusting the tension of
the belt 5 from both ends of the conveyor tensioning screws
27 acting in connection with roller 12 might be mounted.
To safeguard that the drive motor 31 not overtrains
the drive belt or drive chains 8 and 9 two end stop swim-
ekes can be inserted at I and 25 for the switching off no-
spectively possible reversal of the drive direction of mow
ion 31. The end stop switches are shown positioned upon it-
ration rails so that their positions may be adjusted.
The foremost conveyor belt roll may consist of an
inner rotary roll having a somewhat oversize diameter and of
two shorter fixed positioned rolls with smaller diameter
with one such shorter roll positioned at either side of the
rotary conveyor belt roll all mounted having acom~on~eometrical
axis. Hereby the front end becomes more finger touch proof
and therefore more safe to use for the persons during foe-
ding and unloading of the conveyor.
