Improvements in Polishing Discs, Laps, and Bobs.
Year: 1889

page_text: Date of Application, 20th Dec., 1889
Complete Specification Left, 19th Aug., 1890-Accepted, 4th Oct., 1890
PROVISIONAL SPECIF ATION.
Improvements in Polishing Discs, Laps, and Bobs.
I, TIMOTHY POTTER Bricklayer 120 Prescott Street Brookfields Birmingham in the
County of Warwick do hereby declare the nature of this invention to be as follows :-
My invention relates to improvements in discs, laps, and bobs to be used for
polishing steel iron brass and other metals. 1 make said discs, laps or bobs of small
scrap leather and use the same with emery, trent sand, lime, crocus tripoli and rouge
composition.
TIMOTHY POTTER.
COMPLETE SPECIFICATION.
Improvements in Polishing Discs, Laps, and Bobs.
TIMOTHY POTTER of 32 Farm Street, Hockley, Birmingham in the County of
Warwickshire, Bricklayer do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:—
My invention relates to improvements in discs, laps and bobs to be used in polishing
all kinds of metals, glass and other substances and material sufficiently hard to admit
of being polished and has for its object a means for and method of constructing said
discs, laps and bobs of such substances as have hitherto been partly considered waste
material.
Although I do not confine myself to any particular shape or design in cross section
of the laps bobs or discs made and constructed according to my invention, I have
furnished the accompanying sheet of drawings that it may be understood by reference
thereto in what shape or shapes I have in practice found the most useful for
general use.
Figs. 1, 2, 3, 4 and 5, are cross sectional views of laps or discs made and constructed
in such shapes for external polishing generally as in my opinion would be most
needed. Figs. 6, 7, 8, 9, 10 and 11 are cross sectional views of different forms of
bobs for internal polishing.
In carrying my invention into effect I procure pieces of scrap or waste leather such
as the trimmings from boot and shoe making, leather bag and portmanteau manu-
facturing and the like, and cut them up into very small pieces, and when so cut up
I put them into a boiling solution prepared by intimately mixing together, gutta-
percha, india rubber, pitch, shellac. and oil or other grease, in sufficient quantities to
form a hard substance when cold. I allow the before mentioned scraps or small
pieces of leather to remain in the hot solution long enough to become sufficiently
impregnated thereby and incorporated therewith, to ensure perfect adhesion with the
mass when cold. When partially cooled and sufficiently plastic to be manipulated
I place the mixture into moulds prepared to receive them, which may be of any
design shape or conformation that I may consider suitable for the purpose. While
yet hot, each disc, lap or bob to be made is put under heavy pressure until cold, they
are then ready for use.
Or I may in certain cases prepare the boiling mass before referred to by the mixing
together of glue and shellac, or glue and shellac and any suitable greasy substance, or.
gutta percha, glue and shellac, or glue gutta perch, pitch and oil or other grease, or
in any other way to attain the best result for certain and particular purposes, or I
may mix with either of the above mixtures, or any form of mixture made therefrom,
emery powder, trent sand, lime, crocus tripoli, or rouge composition. Or I when
may

page_text: the mixture adopted is nearly cold in the moulds under pressure remove it therefrom
and sprinkle or spread upon one or either or all of the rubbing faces or surfaces of
the lap, disc or bob so prepared any one of the last mentioned powders or ingredients
or any admixture to be made therefrom to produce a special rubbing surface therefor.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what 1
claim is.
First—In the construction of improved discs laps and bobs for polishing purposes,
the use and application of strips or small pieces of leather intimately mixed with
gutta percha, india rubber, pitch, shellac, oil or other grease and glue, or any
admixture that can be made therefrom, and pressed into any desired shape or shapes
substantially as and for the purposes herein described, and shewn by the accompanying
drawings.
Second-In the construction of improved discs, laps and bobs for polishing purposes,
in combination with the method of and means for producing these as set out in the
preceding claim, the use and application of emnery powder, trent sand lime, crocus
tripoli or rouge composition, either mixed therewith or placed thereupon substantially
as and for the purposes herein described.
Dated this 19th day of Anenet 1900.
GEO. THOS. HYDE,
4, Moorfields, London, E.C., Agent for the Applicant.