Improvements in Circular Metal-cleaning Brushes.
Year: 1895

page_text: Date of Application, 2nd May, 1895-Accepted, 8 h June, 1895
COMPLETE SPECIFICATION.
Improvements in Circular Metal-cleaning Brushes.
I, GUSTAV HEINRICH RENDEL, of The Hanptbahnhof, Frankfort on the Main,
in the Empire of Germany, Manager in the Royal Railway Works, do hereby
declare the nature of this invention and in what manner the same is to be
performed to be particularly described anu ascertained in and by the following
statement:-
This invention relates to circular brushes having metallic bristles such as are
used for cleaning and burnishing metal castings and the like, and it consists
essentially of two couvex pressing discs mounted on a hub adapted to grip a ring
of metallic bristles mounted on an insertion piece or core, of extension dises adapted
to reinforce or stiffen the bristles and allow them to be used up to the end, and of a
body part to support the ring of bristles, the object being to provide a more perfect
brush than at present exists, and of one which will allow of a gradual and uniform
wearing away of the bristles.
In the accompanying drawing which illustrates this invention,
Figure 1 is a view in side elevation, the four quarters of which show the
brush in its various stages of construction.
Figure 2 is a view in transverse section of the brush on line r, r, Figure 1, and
Figure 3 is a view in transverse section showing a modification of the construction
of the brush.
Throughout the views similar parts are marked with like letters of reference.
Referring to the drawings, the brush consists essentially of a hub N having a
fixed flange at one end and a threaded nut N¹ at the other end, of two convex
pressing discs P, P, which are swelled or bulged at their outer edges as shown by
Figures 2 and 3, of two extension discs a, g, adapted to be fixed to the discs P, P,
by suitable screws, of a body part F preferably formel in two pieces, and of a ring
of bristles B mounted on a circular core R. The bristles are formed of metal either
in the form of single bristles or pairs of bristles, in the former case the bristles have
an eye and in the latter case-as shown by the drawing-they have a loop whereby
they are mounted on the circular core R which may be either of a round section as
shown by Figure 2 or of a square section as shown by Figure 3. The core R
may either take the form of a complete ring or it may be split to allow of a slight
mobility.
The requisite pressure for holding the bristles in their place is produced by
means of the nut N' screwed on the hub N pressing the discs P, P together. The
swelled portions of the discs P, P,-which are preferably provided with fine radial
serrations--are further secured together by means of rivets n, n, passing
transversely through the bristles. The pieces forming the body part F also
exert a wedge like action on the root ends of the bristles in consequence of the
tightening of the nave N.
up
As the bristles wear away the extension discs are removed and others of a smaller
diameter substituted until the bristles are so worn away that the extension plates are
not required.
The extension dises do not exert any pressure on the bristles, but merely serve
to prevent any lateral movement of their outer ends and to keep the brushing
surluces close together.
By reason of the rigid connection of all the parts of the brush and of the
concentration of all of the forces coming into operation upon the root ends of the

page_text: bristles, the brush becomes as it were on single piece whereby an increased
efficiency and durability is insured.
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 I
claim is
(1) A circular metal-cleaning brush, constructed substantially as hereinbefore
described and illustrated by the accompanying drawing.
(2) A circular metal-cleaning brush, consisting essentially of metallic bristles
formed in single or double lengths mounted round a ring-shaped core, of two
pressing or clamping discs mounted on a suitable nave or hub either with or
without extension discs, and of a body part formed in two pieces, all combined,
arranged and adapted to operate as and for the purpose set forth.
Dated this 2nd day of May 1895.
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.