IMPROVEMENTS IN METALLIC BELTS OR BANDS FOR A communication by Vital Daelen,er, of DRIVING MACHINERY
Year: 1880

page_text: LETTERS PATENT to Johann Heinrich August Bleckmann, of Vienna, Austria,
for an Invention of "IMPROVEMENTS IN METALLIC BELTS OR BANDS FOR
A communication by Vital Daelen, Engineer, of
DRIVING MACHINERY."
Berlin, Prussia.
PROVISIONAL SPECIFICATION left by the said Johann Heinrich August
Bleckmann at the Office of the Commissioners of Patents on the 1st June
1880.
JOHANN HEINRICH AUGUST BLECKMANN, of Vienna, Austria.
IN METALLIC BELTS OR BANDS FOR DRIVING MACHINERY."
by Vital Daelen, Engineer, of Berlin, Prussia.
"IMPROVEMENTS
A communication
These improvements relate to parts of the Invention described in the Specification
of the Letters Patent, Number 4091, in the year of our Lord One thousand eight
hundred and seventy six, granted to Carl Pieper, as a communication from the
aforesaid Vital Daelen, of Berlin, Prussia.
I now employ for the transmission of rotary motion from one pulley to another
pulley simple bands or strips of metal. These belts are of steel carefully hardened
Instead of turning
and afterwards tempered according to well-known methods.
up the circumferences or working surfaces of the pullies to a curved or barrel shape,
as is habitual with pullies upon which common leather belts are employed, I turn
them to a cylindrical shape. The said working surfaces, either of the belt itself,
or of the pullies, or of both, are merely faced with a suitable varnish in order to
increase the adhesion between them. I find that a suitable varnish for this purpose
may consist of resin, or of shellac dissolved in turpentine, or also of so-called
asphalt lac, but several other well known varnishes of this kind may be used with
good effect. This varnish may be renewed from time to time.
In order to be able to use my steel bands on pullies with curved peripheries I
may apply thereto a cement or other suitable substance. The surface thus formed
is afterwards ground, or turned, or filed to a cylindrical shape.
I am aware that sundry attempts have been made from time to time in order to
substitute metallic bands or strips for the ordinary leather belts or straps used in
driving machinery. These attempts have however, as far as I am aware, failed.
ו...מr

page_text: The cause of these failures is to be found in the defective means employed to join
the ends of the metallic bands, whether at the beginning or whenever such a band
got broken during wear.
Now I have invented several forms of fasteners for steel bands, which said forms
differ in construction, but are all alike in one particular constructive detail or
feature to be more fully explained later on.
The form of fastener I prefer to employ consists of a strip of steel or other
sufficiently tough metal, which may be of the same thickness all through, and of
or about the same width as that of the band the ends of which are to be united.
The two ends of this strip are bent back forming a double hook and leaving an
intermediate space.
Into this space the ends of the steel band are inserted after
being suitably softened, and are also bent back in the contrary direction. The ends
of the band are kept tight by means of a couple of keys or wedges.
These keys
may be further kept from loosening by means of small set-screws.
The ends of the double hook are curved upwards from the strap in such wise
that the said ends cannot come into contact with the band, even when the said
band is pulled out straight.
A second form of joint may consist of two strips of steel, each made with a
suitable slot, and each rivetted or otherwise fixed to one end of the belt. Into
these slots is inserted a separate piece of steel with hooked ends coupling the two
ends together. In this case the ends of the two strips are so shaped as to be curved
upwards from the strap in such wise that the said ends cannot come into contact
with the band.
A third form may be constituted of a single piece of steel put in the middle,
and to which the two ends of the bands are rivetted,
The ends of this fastener are also curved upwards from the strap in such wise
that the said ends cannot come into contact with the band.
A further modification of my fastener may be formed out of a single piece of
steel plate, in the centre of which is cut a slot. Into this slot are inserted the
ends of the band which are then bent back, and they are held by set-screws.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Johann Heinrich August Bleckmann in the Great Seal Patent Office
on the 1st December 1880.
st
JOHANN HEINRICH AUGUST BLECKMANN, of Vienna, Austria. IMPROVEMENTS
IN METALLIC BELTS OR BANDS FOR DRIVING MACHINERY." A communication
from abroad by Vital Daelen, Engineer, of Berlin, Prussia.
These improvements relate to parts of the Invention described in the Specifi-
cation of the Letters Patent, Number 4091, A.D. 1876, granted to Carl Pieper as a
communication from the aforesaid Vital Daelen, of Berlin, Prussia.
I now employ for the transmission of rotatory motion from one pulley to another
pulley simple bands or strips of metal. These belts are of steel carefully hardened
and afterwards tempered according to well-known methods. Instead of turning up
the circumferences or working surfaces of the pullies to a curved or barrel shape, as
is habitual with pullies upon which common leather belts are employed, I turn
them to a cylindrical shape; the said working surfaces, either of the belt itself or
of the pulleys, or of both, aro merely faced with a suitable varnish in order to
increase the adhesion between them. I find that a suitable varnish for this purpose
may consist of resin or of shellac dissolved in turpentine, or also of so called
asphaltlac, but several other well known varnishes of this kind may be used with
good effect. This varnish may be renewed from time to time.
In order to be able to use my steel bands on pullies with curved peripheries, I
may apply thereto a cement or other suitable substance. The surface thus formed
is afterwards ground or turned or filed to a cylindrical shape.
I am aware that sundry attempts have been made from time to time in order to
substitute metallic bands or strips for the ordinary leather belts or straps used in
driving machinery. These attempts have however, as far as I am aware, failed.
The cause of these failures is to be found in the defective means employed to join
the ends of the metallic bands, whether at the beginning or whenever such a band
got broken during wear.
Now I have invented several forms of fasteners for steel bands, which said forms
differ in construction but are all alike in one particular constructive detail or
feature to be more fully explained later on.
The form of fastener I prefer to employ consists of a strip of steel or other
sufficiently tough metal, which may be of the same thickness all through, and of or
about the same width as that of the band the ends of which are to be united. The
two ends of this strip are bent back forming a double hook and leave an inter-
mediate space. Into this space the ends of the steel band are inserted after being
suitably softened, and are also bent back in the contrary direction.
The ends of the band are kept tight by means of a couple of keys or wedges.
These keys may be further kept from loosening by means of small set-screws.
The ends of the double hook are curved upwards from the strap in such wise
that the said ends cannot come into contact with the band even when the said
band is pulled out straight.
A second form of joint may consist of two strips of steel, each made with a
suitable slot, and each rivetted or otherwise fixed to one end of the belt. Into
these slots is inserted a separate piece of steel with hooked ends coupling the two
ends together. In this case the ends of the two strips are so shaped as to be
curved upwards from the strap in such wise that the said ends cannot come into
contact with the band when at work.
A third form may be constituted of a single piece of steel bent in the middle, and
to which the two ends of the band are rivetted. The ends of this fastener are also
turned upwards from the strap in such wise that the said ends cannot come into
contact with the band.
A fourth modification of my fastener may be formed out of a single piece of steel

page_text: plate, in the centre of which is cut a slot. Into this slot are inserted the ends of
the band, which are then bent back and they are held by set-screws.
I will now proceed to describe by means of Drawing some of the different forms
of fasteners that I have invented, reference being had to the accompanying Sheet.
On this Figs. 1 A, 2 A, 3 A, 4 A, and 5 A show respectively side elevations of my
different forms of fastener at work on the pulley or drum, and Figs. 1B, 2B, 3B,
4 B, and 5 B, plans or views from above of the same. On Figs. 1A and 1B the
double hook or main part of the fastener or clip is indicated by C, and it consists
of a metallic plate preferably of equal thickness throughout. The end elevation
shows the shape I prefer; it is somewhat bent in the centre and the ends E, E¹, are
curved upwards; D, D', are the keys driven into each hook, and firmly holding the
bent back ends of the steel-band. These keys may be themselves kept from
loosening by means of small set screws s, s¹.
Figs. 2 A and 2B show respectively a side elevation and plan of another form
of fastener I apply to my steel bands. C, C¹, are two separate strips, each made
with a slot somewhat narrower than the band itself. These strips are rivetted to
the band by rivets, ¹, and into these slots are inserted the hooked ends of the
coupling piece P. The strips C, C¹, are shaped to radii about equal to the radius of
the smallest pulley over which the fastener has to run. The ends E, E¹, are curved
or bent backwards and upwards, as shown.
Figs. 3A and 3B show an elevation and plan respectively of a similar but
somewhat modified form of fastener, in which the ends of the bands instead of
being rivetted are bent back over the strips C, C, and held down by set screws 8, 8'.
Figs. 4 show a fastener of one single piece of steel, the outer ends E, E', of which
are bent back as usual, the ends of the bands being rivetted to the fastener by
means of rivets 7, 7. Figs. 5 indicate a fastener also of one piece cut out with
slot H for the insertion of the ends of the band, which are held down by
screws 8, 8¹.
Now in the above cited Specification, No. 4091, A.D. 1876, metallic bands were
proposed as substitutes for leathern straps, but I am not aware that metallic bands
have ever previously been used in combination with a varnish applied either to the
band itself or to the working surfaces of the pulleys, or to both, nor am I aware
that fasteners, such as described, have ever been applied to any kind of belt,
whether of leather or of metal. I now therefore declare that what I claim and
desire to secure to me by the present Letters Patent are,-
1. The transmission of rotary motion from one pulley to another by means of an
endless belt consisting of a band of hardened and tempered steel provided with a
varnish on its working surface, as and for the purposes described.
2. The transmission of rotary motion from one pulley to another by means of an
endless belt consisting of a band of hardened and tempered steel, such pulleys being
shaped to a cylinder and provided with a varnish on their working surfaces, or
both cylindrical pulleys and the steel belt being provided with a varnish on their
working surfaces, as and for the purposes described.
3. The construction of the fasteners for steel belts, substantially as described and
illustrated by means of the Drawings.
4. Shaping the two outer ends of fasteners for steel belts in such wise, or curving
them upwards to such an extent, that the said ends cannot come into contact with
the belt when stretched out straight while at work or otherwise.
In witness whereof, I, the said Johann Heinrich August, Bleckmann, have
hereunto set my hand and seal, this Twenty sixth day of November, in the
year of our Lord 1880.
JOHANN HEINRICH AUGUST BLECKMANN. (L.S.)