Improvements in Apparatus for Boring Brush Blocks and similar Articles.
Year: 1893

page_text: Date of Application, 28th Apr., 1893
Complete Specification Left, 10th Nov., 1893-Accepted, 16th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Boring Brush Blocks and similar
Articles.
I, ANDREW COVENTRY WRIGHT of 6 Greenside Place in the City of
Edinburgh, Brush Manufacturer, do hereby declare the nature of this invention to
be as follows:-
This invention which relates to apparatus for boring brush blocks and other
articles in which perforations are to be made at various inclinations has for its
object the provision of improved means for holding or guiding the brush block or
other article in presenting its face to the boring tool so as to ensure the boring of
the holes in the block at regular and suitable inclinations to its face without
employing skilled labour.
The improved apparatus comprises a bracket piece which is secured adjustably
to the sole plate or bed of the usual brush boring machine or lathe and which is
provided with longitudinal guide rods or V-guides whereon is fitted a sliding frame
carrying a swivel joint. Through the swivel joint is passed a rod or spindle having
adapted to its forward end a sliding plate or holder to which the brush block or
other article to be bored is secured. The attachment of the sliding plate or holder
to the spindle is made by a disc on the latter fitted in a circular guideway or
sliding block which is fitted to slide on guide rods or grooves ou the back of the
plate or holder for the brush block. This arrangement provides for both circular
and lateral or endwise movement of the holder in boring the brush block whilst the
sliding frame carrying the swivel joint permits of the brush block being brought
up to the boring tool. The rod passing through the swivel joint and carrying the
work holder is in line with the horing tool and a central row of perforations
normal to the face of the block whilst it is held vertically may be bored by moving
the holder in its guides to the desired extent between each action of the boring
tool, but the remaining rows of holes which are all bored radially towards the
centre of oscillation of the swivel joint will be bored at various degrees of
inclination depending on the extent of inclination of the face of the brush block to
the vertical plane which depends upon the distance at which the brush block is
situated from the swivel joint this distance being adjustable by clamping the rod or
spindle in the swivel joint by a pinching screw or otherwise.
The swivel joint may be secured adjustably in the sliding frame which carries it
so as to be elevated or depressed by means of a screw or like device to provide in
small compass for presenting the face of the brush block at greater degrees of
inclination to, the boring tool or the bracket may be made in parts so as to be
capable of vertical adjustment.
For the purpose of securing the brush block at its ends on the holder I employ
swivelling clamps which are each jointed to a screw bolt or pin passing through a
slot in the holder and retained by a nut or like means.
Dated this 27th day of April 1893.
CRUIKSHANK &. FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Boring Brush Blocks and similar
Articles.
I, ANDREW COVENTRY WRIGHT of 6 Greenside Place in the City of
Edinburgh, Brush Manufacturer, 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 :-
This invention, which relates to apparatus for boring brush blocks and other
articles in which perforations are to be made at various inclinations has for its
object the provision of improved means for holding or guiding the brush block or
other article in presenting its face to the boring tool so as to ensure the boring of
the holes in the block at regular and suitable inclinations to its face without
employing skilled labour.
In the accompanying drawings
Figures 1 and 2 are side and end elevations and Figure 3 is a plan of one
modification of the apparatus for carrying the brush block to be bored.
Figures 4, 5 and 6 are similar views shewing another modification and
Figures 7, 8 and 9 are views in detail of a modified form of the block holder.
As represented in Figures 1, 2 and 3 the improved apparatus comprises a bracket
piece A which is secured adjustably to the sole plate or bed of the usual brush
boring machine or lathe and which is provided with longitudinal guide rods A¹ or
V-guides whereon is fitted a sliding frame B carrying a swivel joint C. Through
the swivel joint C is passed a rod or spindle D having adapted to its forward end a
sliding plate or holder E to which the brush block or other article to be bored is
secured. The attachment of the sliding plate or holder E to the spindle D is made
by a disc D' on the latter fitted in a circular guideway or sliding block E' which is
fitted to slide on guide rods F or in grooves on the back of the plate or holder E
for the brush block. This arrangement provides for both circular and lateral or
endwise movement of the holder E in boring the brush block whilst the sliding
frame B carrying the swivel joint C permits of the brush block being brought up to
the boring tool. The rod D passing through the swivel joint C and carrying the
work holder E is in line with the boring tool and a central row of perforations
normal to the face of the block whilst it is held vertically, may be bored by moving
the holder in its guides to the desired extent between each action of the boring tool
but the remaining rows of holes which are all bored radially towards the centre of
oscillation at c of the swivel joint C will be bored at various degrees of inclination
depending on the extent of inclination of the face of the brush block to the vertical
plane which depends upon the distance at which the brush block is situated from
the centre c of the swivel joint C this distance being adjustable by clamping the
rod or spindle in the swivel joint by a pinching screw C' or otherwise.
The swivel joint C may be secured adjustably in the sliding frame which carries
it so as to be elevated or depressed by means of a screw or like device to provide
in small compass for presenting the face of the brush block at greater degrees of
inclination to the boring tool or the bracket may be made in parts so as to be
capable of vertical adjustment.
For this purpose the arrangement shewn at Figures 4, 5 and 6 is most convenient.
The swivel joint C is connected to the sliding frame B through a jointed frame-
work composed of links or levers B₁ pivoted at a which may be when desired fixed
at any inclination to the sliding frame by means of a pinching screw and
links B B the one B connecting the links B₁ and the other B connecting an
arm C fixed on the swivel joint to a beam lever B' centred on an arm B' secured to
the sliding frame. The arrangement is such that on the operator turning the
brush block through any angle up to 90° the inclination of the levers B¹ is varied
through the action of the arm C' and connecting links B* B* B*.
°

page_text: When it is desired to use the machine in its simpler form the link B' can be
disconnected and the levers B¹ fixed at any position by means of the pinching
screw b¹.
In some cases and to permit of bringing the brush block in as close proximity as
possible to the centre of oscillation of the swivel joint I employ a block holder
constructed as represented at Figures 7, 8 and 9 in which the holder E instead of
being connected through a disc to the spindle is directly. secured thereto whilst the
spindle D is fitted to turn freely in the swivel joint for which purpose it is
formed with a series of grooves & wherewith the pinching screw C¹ engages.
For the purpose of securing the brush block at its ends on the holder I employ
swivelling clamps F¹ which are each jointed to a screw bolt or pin ƒ passing
through a slot G in the holder E and retained by a nut or like means.
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 combination of parts constituting the improved apparatus for use in boring
brush blocks and similar articles substantially as described under several
modifications with reference to the annexed drawings.
2. In apparatus used in boring brush blocks and like articles the combination of
the sliding frame B swivel joint C spindle D and block holder E substantially as
described.
3. In apparatus used in boring brush blocks the block holder E adapted to a
Swivel joint so as to be capable of presenting the brush block at any desired
inclination to the boring tool substantially as described.
Dated this 9th day of November 1893.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.