Year: 1895

page_text: =
Date of Application, 3rd July, 1895
Complete Specification Left, 7th Apr., 1896-Accepted, 16th May,
1896
I, ALFRED FOSTER, of
Herts, Timber Merchant, do
follows:-
or Stocks.
Boxmoor Saw Mills, Boxmoor, in the County of
hereby declare the nature of this invention to be as
My invention relates to improvements in machines for boring brush boards or
stocks.
According to my invention I employ a series of drill spindles, each of which is
mounted in pivoted sockets near the upper and lower ends, the said sockets being
carried by suitable bars the upper of which is fixed whilst the lower one is made
movable to permit of varying the angle of the said spindles relatively with the
table or surface upon which the boards or stocks are supported during the boring
operation.
In order to permit of the points of the drills being maintained at a practically
uniform distance above the table, notwithstanding the angle of the drill spindles, I
provide an additional bar carrying a series of pivoted sockets in such a manner
that by altering the position of this third bar relatively with the other bars the
said drill spindles may be raised or lowered. This third bar also serves for driving
the drills forward into the work.
In practice I find it advantageous to employ toggle arms for effecting the
adjustment of the drills.
My drills, arranged as hereinbefore described, may be driven by any suitable
means but I find it very advantageous to employ driving mechanism such as
described in the Specification of former Letters Patent granted to me No. 2156
of 1893.
The table upon which the boards or stocks are supported is adapted to pivot in
the direction of the length of the boards, and the pivots which support the said.
table are made adjustable so that the curvature of the are through which the table
moves may be varied to suit the desired angles of the holes to be drilled.
I sometimes joint the table to the arms to which it is pivoted in order that it
may be canted for certain kinds of work.
To permit of laterally adjusting the table according to the angle of the holes to
be drilled (from the centre to the sides of the boards) in such a manner that the
position of the table shall always correspond with the angle of the drills I connect
the said table to a pivoted bar which is also connected to the lower and inter-
mediate bars carrying the pivotal sockets, whereby when the table is moved laterally,
for instance by means of a rack and pinion, the drill spindles will be moved to the.
proper extent.
To ensure the uniform drilling of the boards or stocks to pattern, I arrange on the
table adjacent to the blocks to be drilled a drilled templet working in conjunction
with a dummy drill.
To permit of readily clamping the boards in position upon the table and of
releasing them therefrom I provide at one side of the table a clamping bar notched
to receive one end of each board and at the other side of the table I arrange a
umber of notched blocks corresponding with the number of notches in the clamping
These notched blocks have arranged in connection with them springs which
bar.

page_text: will compensate for any slight irregularities in the lengths of the boards, the said
springs pressing at one end against a bar common to all the blocks, which bar is
made adjustable for the purpose of varying the pressure.
Dated this 3rd day of July 1895.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
Improvements in Machines for Drilling or Boring Brush Boards
or Stocks.
I, ALFRED FOSTER, of Boxmoor Saw Mills, Boxmoor, in the County of
Herts, Timber Merchant, 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 machines for boring broom and brush
boards or stocks.
According to my invention. I employ a series of drill spindles, each of which is
mounted in pivoted sockets near the upper and lower ends, the said sockets being
carried by suitable bars the upper of which is fixed in so far as vertical movement
is concerned whilst the lower one is made to move horizontally to permit of varying
the angle of the said spindle relatively with the table or surface upon which the
boards or stocks are supported during the boring operation.
In order to permit of the points of the drills being maintained at a practically
uniform distance above the table notwithstanding the angle of the drill spindles
and also raised and lowered, I provide an additional bar carrying a series of
pivoted sockets in such a manner that by altering the position of this third bar
relatively with the other bars the said drill spindles may be raised or lowered.
This third bar also serves for driving the drills forward into the work.
In practice I find it advantageous to employ toggle arms for effecting the
adjustment of the drills.
My drills, arranged as hereinbefore described, may be driven by any suitable
means but I find it very advantageous to employ driving mechanism such as that
described in the Specification of former Letters Patent granted to me No. 2156
of 1893.
The table upon which the boards or stocks are supported is adapted to pivot in
the direction of the length of the boards, and the pivots which support the said
table are made adjustable so that the curvature of the arc through which the table
moves may be varied to suit the desired angle of the holes to be drilled.
To permit of laterally adjusting the table according to the angle of the holes to
be drilled (from the centre to the sides of the boards) in such a manner that the
position of the table shall always correspond with the angle of the drills I connect
the said table to a lever which is also connected to the lower and intermediate bars
carrying the pivotal sockets, whereby when the table is moved laterally, for
instance by means of a rack and pinion, the drill spindles will be moved to the
proper extent.
To ensure the uniform drilling of the boards or stocks to pattern, I arrange on
the table adjacent to the blocks to be drilled a drilled templet working in conjunction
with a dummy drill.
To permit of readily clamping the boards in position upon the table and of
releasing them therefrom, I provide at one side of the table a clamping bar notched
to receive one end of each board, and at the other side of the table I arrange a
number of notched blocks corresponding with the number of notches in the clamping
bar. These notched blocks have arranged in connection with them springs which

page_text: will compensate for any slight irregularities in the lengths of the boards, the said
springs pressing at one end against a bar common to all the blocks, which bar is
made adjustable for the purpose of varying the pressure.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which :-
Figure 1 is a sectional elevation of a boring machine constructed according to
my invention; and,
Figure 2 is a vertical section of the same on the line 2-2, Figure 1:
Figures 3 and 4 are sectional views shewing the table in different positions
relatively with the drills:
Figure 5 is a plan view of the table upon which the stocks are clamped:
Figures 6 and 7 are details hereinafter described.
"P
a is the framing of the machine, and b, b are the cranked drill spindles, which
spindles are directly carried by the bar e (hereinbefore referred to as the additional
bar) in pivoted bearings d, d arranged between collars e, e on the spindles, in such a
manner that the vertical movements of the bar c cause the corresponding and
down movements of the drill spindles. f, g are the bars at the upper and lower
ends respectively of the drill spindles and which carry bearings in which the said
spindles rotate, the said bearings being pivoted in order that they can accommodate
themselves to the angle at which the drills are working but at the same time being
so arranged that they will allow of the drill spindles sliding within them. The
bar fas shewn in the drawings forms one of a series of bars operated by eccentrics
or cranks as described in the Specification No. 2156 of 1893 before referred to and
serves to communicate rotary movement to the drill spindles.
his the table upon which the stocks i are supported whilst being drilled, the said
table sliding upon a bed ¹ having two downwardly extending arms * pivoted to
the side bars j, j of a stirrup frame by means of pins which frame in its turn is
pivoted by means of pins to the side bars k, k of a second stirrup frame k the
said side bars of which slide in the grooved uprights k¹, k¹.
As shown several sets of holes are provided for the pins j¹ and to permit of
shifting the said pins according to the curvature of the stocks and of the angle of
the holes to be bored. 3,3 are pius which serve to lock the table rigidly with the
frame or the frame with the frame k.
is a bar arranged to move horizontally upon rollers l', on the frame a and
carrying two guide-rollers m, m which enter grooves m', m² formed in the
sides of the table, the said rollers being arranged in the vertical plane
passing through the drill spindles 6 so that notwithstanding any angle to which
the table may be tilted according to the angle of the holes to be drilled, for
instance to the position indicated in Figure 3, the surfaces of the blocks immediately
beneath the points of the drills will be constantly in the same vertical position.
The bar advantageously serves as a support for the bar g which is guided thereon
by guide-rollers g', g', antifriction balls being arranged between the two bars as
shown in Figure 2.
To permit of the movements of the table upon the pivots j, j or, the
shanks m³ of the forks carrying the rollers m, m are pivotally connected to the
bar 1. When the table is tilted, for instance as shown in Figure 3, so that the ends
of the stocks are beneath the drills, the pivots will be farther from the points of
the drills than when the latter are drilling at the central portions of the stocks_as
in Figure 2, the sides of the stirrup frame k sliding in the uprights k¹. To render
the up and down movements in these uprights as easy as possible I arrange beneath
the second stirrup frame k a counterbalance, which, as shewn, consists of two lever
arms n carrying rollers at one end which bear against the underside of the said
frame k and are at their other ends connected by links n', n' to a counterweight n².
With this arrangement it will be readily understood that as the table is moved
from its upright position to an inclined position or vice versa the necessary vertical
movement will be provided for.
The movement of the table to feed the blocks along so that they can be

page_text: properly presented to the drills as the holes are successively drilled is effected
by means of a pinion o mounted on a spindle o' on the underside of the bed h¹ and
engaging with rack teeth o on the underside of the table h, and in order that
after the drilling of one set of holes the angle of the drills shall be correspondingly
altered 'to suit the next set of holes to be drilled I connect the bar l' which
traverses with the table (owing to the rollers m running in the grooves m¹) with
the barse and g hereinbefore described. The connection is advantageously effected
through the medium of a lever p pivoted to the frame a at p on a line passing
through the centres of the drill spindle bearings in the barf and at its free end
engaging with a slotted army on the bar I. The said lever p is also connected
with the bars g and c so that when the bar is moved the bars g and c will be
correspondingly moved. It will of course be understood that the connection
between the lever p and the arm q and the bars g and c are slotted or sliding to
permit of the oscillatory movement of the said lever p.
In order to maintain the parallelism of the bars g, c and f there is arranged at
the ends of the same opposite to that at which the lever is connected a lever r
which is jointed to the bars g and c and to the framing a in the same manner as the
lever p.
It will be obvious that when after one set of holes has been drilled and the table
is moved by the pinion to vary the angle of the drill spindles it will be necessary
to traverse the table a further distance corresponding to the distance between the
last hole drilled and the next hole to be drilled and that therefore the table has to
move a greater distance than is necessary for the simple alteration of the angle of
the holes. This movement is provided for by the arrangement of the arm
herein before described and to permit of adjusting the distance which the table
traverses relatively with the drills (according to the width of the stock to be drilled)
the said army is slotted so as to permit of arranging the pivot or bolt connecting
the said arm with the lever p nearer to or farther from the centre of oscillation
of the lever p.
To effect the feeding of the drill spindles into the work and the lifting of the
same from the work when the holes are drilled, I provide for moving the bar c
(by means of which the weight of the drill spindles is carried as herein before
described) relatively with the bar g, and for this purpose, I arrange between the
said bars the pairs of toggle levers s, & connected by a rod t. It will be obvious
that by altering the angle of the toggle levers s, s the distance between the bars c
and will be correspondingly increased or diminished.
is a lever mounted upon a pivot on the bar y and connected with the rod t, the
said lever having a hand wheel formed in conjunction with it so as to permit of
readily moving the said lever for raising and lowering the drills.
•
To render the movement of this bar t as easy as possible the weight of the bar c
together with that of the drill spindles b, bis counter-balanced by weights v, v
connected to sleeves w, w which form a sliding connection between the bar c and
the levers and r.
is the notched clamping bar fixed upon the table and serving for holding the
stocks at one end and ', ' are the series of notched blocks which hold the stocks
at the other end, 2, 2 are springs arranged to press these blocks into contact with
the stocks to hold the latter tightly. is a bar against which the springs also
bear and which can be adjusted backwards or forwards by means of screws *, it
and hand wheels according to the lengths of the stocks to be drilled.
y is the drilled templet and the dummy drill which I employ for ensuring the
uniform drilling of the blocks.
The operation of the machine is as follows:-
The required number of stocks being fixed upon the table and the drills set in
motion the operator moves the lever u to lower. the drills to their work the dummy
drill at the same time entering the hole in the templet, as shewn in Figure 1.
The holes being drilled the operator lifts the drills out of their work by means of
the lever and then oscillates the table to the desired extent to bring the stocks in
26

page_text: position for drilling the next set of holes and so on, until a row of holes along each
stock has been drilled. The operator then moves the table by means of the rack
and pinion o, o' in order to alter the inclination of the drill spindles and to move the
boards the required distance to suit the position of the next set of holes, another
row of holes is then drilled along each stock as hereinbefore described and then the
table is again shifted, the dummy drill and templet at all times being made to
correspond before the drills are allowed to enter the work. In the case of rows of
holes which take a curvilinear form, it will be obvious that the table must be
oscillated and moved laterally, thereby simultaneously altering the inclination of
the drill spindles.
When the holes have to be drilled at a greater inclination than can be attained
by merely oscillating the table upon the pivots 2 as herein before described I
oscillate the table upon the pivots j. as shewn in Figure 4.
In this case
the pins,, which normally lock the table relatively with the stirrup frame 1º,
are removed and employed to lock the said stirrup frame relatively with the
stirrup frame k so that the table can be oscillated upon the pivots j' as shewn in
Figure 4.
In using a drill of the kind bereinbefore described it is found that although the
throw of the eccentrics which drive the bar may be suitable for operating the
drill spindles when more or less upright, nevertheless, when the drill spindles are
more or less inclined a slightly greater throw is necessary. As, however, it is
difficult to provide for altering the throw of the eccentrics I provide the arrange-
ment shewn in Figure 1 wherein it will be understood that each of the drill
spindles 6 is made in two parts the upper of which is provided with a socket into
which the upper end of the lower part enters as clearly shewn at 6'.
By thus allowing the two parts to slide relatively with one another I obviate
the inconveniences which would arise owing to any variations of the throw of the
cranks.
The machine herein before described is especially adapted for drilling stocks
wherein all the holes are practically radial with a common centre as shewn in
Figure 6; in some brushes, however, it is requisite (especially those designed to
have a stale or handle fixed thereto) that the bristles or the like should cover the
hole for the stale or handle and for this purpose the central bristles, instead of
being inclined away from each other as would be the case with the brush having a
stock of the kind shewn in Figure 6, are inclined towards each other, the result
being that the holes in the stock have practically to radiate from two centres as
shewn in Figure 7. To adapt my machine for drilling stocks of this kind I make
the table so that it can be moved laterally at right angles to its present direction
of movement, that is to say, in the direction of the arrows, Figure 2. This
arrangement permits of bringing the centre of each half of the brush immediately
beneath the drills when the table is horizontal.
Having now particularly described and ascertained the nature of my said inveu-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a machine for drilling or boring brush boards or stocks a series of drill
spindles mounted in pivoted sockets in three parallel bars one of which serves for
communicating movement to the drill spindles another for effecting their angular
movment and the third for effecting the vertical movement of the said spindles all
substantially as described.
2. In a machine for drilling or boring brush boards or stocks the combination
with a series of spindles mounted in bearings in three bars substantially in the
manner referred to in the preceding claiming clause, of a table capable of moving
in a horizontal plane and of being oscillated and of means for causing the said table
to move to correspond with the angular position of the drills, substantially as
described.
J
.
3. In a machine for drilling or boring brush boards or stocks whereiu an

page_text: oscillating table is employed mounting the said table upon a stirrup frame sliding
in guides and acted upon by a suitable counter-balance substantially as described.
4. In a machine for drilling or boring brush boards or stocks means for clamping
the stocks while being drilled comprising a notched bar fixed to the supporting
table and movable notched blocks adapted to be pressed against the stocks by a
bar actuated by screws, springs being interposed between the bar and the blocks
substantially, as and for the purpose, described.
5. The improved machine for drilling or boring brush boards or stocks consisting
of the parts constructed and combined substantially in the manner hereinbefore
described and illustrated in the accompanying drawings and operating as and for
the purposes set forth.
Dated the 7th day of April 1896.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant