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Gene Or Protein
(1/ 1)
Number GB402303A
EN Title Improvements
Drawings to Specification.
[Class 89 (i).] In a rigid bolted joint between mechanical parts, the
meeting faces of the parts are sprinkled or covered with a layer of
hard finegrained powder such as emery or carborundum , and pressure is
applied between the parts to maintain them in contact.
The powder penetrates the meeting surfaces and increases the friction
between the two parts.
To facilitate application, the powder
plastic material, e[[g]] lubricating-oil.
may be mixed with liquid or
7 ' -/
Convention Date (Germany): March 19, 1932.
Application Date (in United Kingdom): March 17, 1933 No 8080/33.
Complete Accepted: Nov 30, 1933.
Improvements in or relating to Mechanical Joints and Connections.
1, P 1 A Ir L 3 IEYL El, a German Citizen, of 17, Heemskerkstraat,
Delft, Holland, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described
I and ascertained in and by the following statement:It is known-to reduce slipping of fabric driving belts or to replace
the worn surfaces of brake or clutch linings by providing the gripping
surfaces of the driving belts or the said linings with a coatinlg of
an abrasive material and to apply said abrasive in the form of a
suitable filuid composition.
In contradistinction thereto my invention relates to rigid frictional
coninections between mechanical or constructional parts.
The strength of such rigid frictional connections was hitherto limited
by the natural co-efficient of friction of the contacting surfaces.
According to the present invention, a A rigid frictional connection
between mechanical or constructional parts is obtained by applying
hard fine-grained powder to one or both surfaces of said parts which
are to interengage, and then applying the surfaces to one another
under pressure.
The said powder may consist of emery or corhorunduin and may be mixed
with a liquid or plasti'e material.
I have found by tests that in this way t 5 the coefficient of
friction, which otherwise is as low as 0,25 for instance in the case
of steel bearing against steel, may be in. creased to about 0 65 so
under conditions otherwise unchanged, the strength of a
connection is more than doubled.
MY invention may be applied to any rigid connection of parts in
machinery as obtained 'by friction, and is also particularly suited
for surfaces to be pressed against each other or to be subject to
pressure after having 'been assembled, as e g. for cranks to be shrunk
on shafts or for hurbs to be forced or pressed on shafts.
When a crank or the like is forced on to a shaft whilst cold, by the
application of axial pressure, the powder may be preliminarilv applied
to the shaft and forced jino thse surface of the shaft by means of
lPrice 1/-l rolls or the like before application of the crank thereto
55 In order to obtain that the powder can be applied also to surfaces
other than horizontal, it is preferably or advantageously mixed with
any suitable liquid or plastic material, e g lubricating oil or 60 the
like, so as to result in an ointment or paste adapted to be spread
over the surfaces concerned.
Only a very thin layer of such ointment or paste is required,, and
only on one of 65 the surfaces to be brought into contact with each
otherThe increase of the coefficient of friction as obtained according
to my inveniion also affords the advantage that Conl 70 nections of
equal strength can be secured in spite of lower pressure exerted on
the surfaces and of smaller dimensions of the same.
Moreover, my invention lends itself 10 75 connections by riveting or
in a similar manner For a satisfactory riveted connection it is
essential that the frictional resistance between the plates is so high
that under normal load the rivets cannot 80 be subject to shear Above
anl it is, in the case of alternating load, very important that the
transmission of load is done by friction, since a movement would occur
unless the rivets completely fill out their 85 holes.
According to my invention, the hard fine-grained powder is brought
between the plates, prior to assembling, so as to increase the
frictional resistance produced go by the plates being pressed against
each otier by riveting This method affords the possibility of more
than doubling the coefficient of friction With equal dimen. sions of
the parts connected this results in 95 a frictional resistance
increased in the same degree, and this, by itself, ensures the
of the connection to be so much increased that the
cross-section of the rivets can be reduced as compared 100 with that
and tbat at the same time the plates are
correspondingly less weakened by the rivet holes.
When the plates are not pressed against each other by rivets but 'by
bolts, screws, 105 wedges or the like means, the advantages, less than
and -\ 402,303 m l:j (-j Rl-' 1 -1 m 3'd u, " _J, A t -, 1 obtained
are about the same.
The powder may be simply strewn on the surfaces concerned but it is
advantageous also in this embodiment of my invention to mix it with a
suitable liquid or plastic material and to then apply it to the
surfaces as a paint or coating In this case the surfaces need not be
brought into a horizontal position.
In the accompanying drawing, my
exanmple, in several embodiments.
way of
Figs 1 and 2 show a longitudinal section and a front elevation of a
built-up crank shaft, Figs 3 and 4 show a side elevation and a front
elevation of a lever or crank clamped on a shaft, Figs 5 and 6 show a
front elevation and a longitudinal section of a pulley clamped on a
shaft, and Figs 7 and 8 show
section of a riveted connection.
a top plan view and a longitudinal
As to the crank shaft shown by Figs I and 2, the crank weba 1 are
shrunk on the shafts 2 and the crank pin 3 Prior to shrinkine, the
surfaces to be shruiik on each other are provided with the liard
fine-grained powder spread over, which may be mixed with a liquid or
plastic material so as to better stick to the round surfaces.
In the embodiment shown by Figs:) and 4, the lever or crank web 4 is
fastened to the shaft 5 by the lever being split at 6, and, after
assembling, the two win Rs 6 of the lever 4 are pressed on the shaft
by means of the bolt 7 so that the said. lever 4 is held on the shaft
5 by friction onlv In this instance, the frictional resistance is also
increased by applying a hard fine-grained -powder, mixed with a
material rendering it more adhesive to 43 the surfaces to be clamped
on one another.
In the embodiinent shown by Figs 5 and 6, a pulley composed of the two
parts 81 and 8 il is fastened to te shaft 9 in such a way that the
jaws 101 and Mi O l of the said two pulley halves are pressed together
and against the circumference of the shaft 9 by means of the bolts 11
and 12 so that the pulley is secured to the, said shaft by friction
only In this ease, the surfaces to be-clamped against one another have
also had previously applied thereto a hard flue rained powder intended
for increasing the frictional resistance and said powder having been
so preliminarily mixed with a liquid or plastic material rendering the
powder more adhesive.
As to the riveted connection shown by Figs 7 and 8, the two plates 14
and 15 t) he connected to each other are pressed together by the
rivets 16 In order to obtain by an increased degree of friction that
the' two said plates 14 and 15 are prevented from sliding, a hard
Ilnegrained powder increasing the frictional 70 resistance produced by
the plates being pressed against each other has been:broun ht between
the said plates prior to assembnling Also in this instance, the powder
to be applied may be mixed with 75 a suitable liquid or Dlastic
material so as to be susceptible of being applied as a coating or the
In all figures, the surfaces provided with hard fine -grained powder,
mixed with 80 a material rendering it more adhesive, have been marked
bv lines thicker than the other lines.
Having now particularly described and ascertained th 1 e nature of my
said inven 85 tion and in what manner the same is to be performed, I
declare that what I
claim is:1 A method of forming a rigid friciional connection between mechanical
r 80 constructional parts, consisting, in applying a hard fine-grained
powder to one or both surfaces of said parts which are to interengage
and then applying said surfaces to one another -under pressure 95
2 A method as claimed in Claim 1 in which the hard fine-grained powder
is mixed with a liquid or plastic material.
3 A method as claimed in Claim 1 for forming riveted and like rigid
connections -00 or joints in which prior to assembling the parts to be
riveted together, a hard finegrained pounder is brought between she
surfaces of said parts in order to increase the frictional effect
which is produced i O when the said parts are secured to each other.
4 A rigid joint between mechanical parts in which the meeting faces or
the parts are sprinkled or covered with a layer li 1 of hard 'finegrained powder and pressure is applied between the parts to maintain
them in contact.
5 A built up crank shaft according to Claim 4, consisting of crank
webs shrurir 115 o IL shafts with thne interposition of hard
fiiie-grained powder between the intereneaning surfaces of said webs
and shafts.
6 A torque transmitting X assembly 120 accordino' to Claim 4
comprising a shaft or spindle and a p Dulley wheel, hub, craink or the
clamped thereon in which a hard fine-grained, nowder is
interposed between the intrengawinw surfaces 125 of the part forming
the assembly.
7 A riveted connection according to 0 Claim 4, in which a fine-grained
pow"der is interposed between the interen-gaging surfaces of the
riveted joints 130 402,303 402,303
8 Assemb Lies consisting of mechanically and rigidly connected parts
described with reference to the accompanying
9 Methods of forming a rigid connection between two or more mechanical
or constructional parts, substantially as described. Dated this 16th
day of March, 1933. W P THOMPSON and Co, 12, Church Street, Liverpool,
1, Chartered and Registered Patent Agents. Redbill: Printed for His
Majesty's Stationery Office, by Love and 'Vlalconisoni, Itd 1933. I
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