Improved Methods of and Means for Attaching Rubber Coverings to Parts of Machinery.
Year: 1897

page_text: Date of Application, 4th Dec., 1897-Accepted, 29th Jan.,
1898
COMPLETE SPECIFICATION.
Improved Methods of and Means for Attaching Rubber Coverings to
Parts of Machinery.
I, HEINRICH TRAUN, Doctor, of 60, Meyer Strasse, Hamburg, in the Empire of
Germany, do hereby declare the nature of my said invention and in what manner
the same is to be performed to be particularly described and ascertained in and
by the following statement:-
The present invention consists of a method of securing rubber coatings or
coverings to shafts and other parts of machinery, and more particularly to electrical
machinery, so that the said coating will be able to withstand the necessary friction,
expansion and contraction, owing to variations of temperature, and pressure and
tension, without getting loosened, or otherwise displaced.
The method may be carried out in two ways, viz. either by securing the rubber
in unvulcanised condition to the part of machinery in question and then vulcanis-
ing the said rubber together with the part to which it is attached, i.e. exposing the
part to which the rubber is attached to the vulcanising process, or by attaching
soft rubber in a vulcanised condition to the parts of the machine. In both cases
similar means for securing the said rubber are employed. In the case of shafts
collars may be employed, having annular shoulders formed thereon the cross
section of which increases inwardly, said collars being slid over the shaft. If it
is required to attach rubber to flat surfaces, frames may be employed having
similar grooves or being undercut in a similar manner and said frames may be
screwed down on the rubber as herein after set forth.
And in order to render the present specification more easily intelligible reference
is had to the accompanying drawing in which similar letters of reference denote
similar parts throughout the several views:
Fig. 1 is a longitudinal section through a shaft provided with a rubber covering,
Fig. 2 a similar section through a modified form of the invention,
Fig. 3 a similar section but through the collar only, of another form of applying
the invention,
Fig. 4 a modified form of the device shown at Figure 3,
Fig. 5 a cross section through a frame for securing a sheet of rubber to a flat or
partially or slightly curved surface and
Fig. 6 a plan of Figure 5.
The arrangements shown in Figures 1 and 2 may be termed "chemical attach-
ments" whilst those shown at Figures 3 to 6 are what would be termed
mechanical attachments. Both methods of carrying out the invention offer
perfect security against slipping or displacement of the sheet or sleeve of rubber,
and the employment of one or other of the methods depends entirely on circum-
stances, since vulcanisation of the rubber together with the particular part of the
machinery to which it is attached, means subjecting such part to a heat of at least
120 to 150 degrees, Celcius, which would not be necessary if the mechanical
attachment" is employed.
Fig. 1 shows a shaft having two end plates a having their adjacent sides or

page_text: surfaces under cut, so as to form annular rings c which grip the rubber sleeve b.
The soft rubber is first arranged on the shaft between the gripping rings c and
the whole is then subjected to the vulcanising process, by which means the rubber
sleeve is vulcanised, whilst on the shaft. In Figure 2 the rubber sleeve b is first
pressed underneath the gripping surface of the rings d and e, which form with
the shaft an annular space having an inwardly increasing cross section, so that
the rubber is firmly gripped by the rings or collars. The rubber sleeve is then
subjected to the vulcanising process together with the part of the machine to
which it is attached. In Figure 3 a collar having an annular recess which is
slightly conical inwardly, is passed over the end of the sleeve b which is soft and
previously vulcanised. The collar f securely holds the sleeve b on the shaft a.
According to Figure 4 the cross section of the annular recess h is considerably
enlarged inwardly. Fig. 5 shows a frame i which is screwed or rivetted to the
part at n and is provided with an undercut inner recess m having its cross section
enlarged interiorily. By means of this frame the sheet of rubber o is secured to
the part of the machine.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
1: The method of attaching rubber coverings to parts of machinery, which con-
sists in first pressing the unvulcanised rubber into the securing device such as
covered by Claim 3 and then vulcanising the rubber together with the part of
machinery to which it is attached substantially as described.
2: The method of affixing rubber to machine parts, which consists in attaching
vulcanised soft rubber by means of the devices covered in Claim Three, said parts
being either wedged or screwed or rivetted to the part in question substantially
as described.
3: Means for attaching rubber to machine parts consisting of collars or frames
having annular undercut recesses or undercut grooves as specified, with interiorily
increasing cross section, which former may be wedged or otherwise attached to
the parts whilst the latter may be screwed, rivetted or otherwise affixed, sub-
stantially as described.
1
100%
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.