Improvements in and connected with Machinery for the Multiple Boring of Brushes, Brooms, or other Artioles.
Year: 1893

page_text: Date of Application, 31st Jan., 1893
Complete Specification Left, 31st Oct., 1893-Accepted, 16th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in and connected with Machinery for the Multiple
Boring of Brushes, Brooms, or other Artioles.
I, ALFRED FOSTER, of The Saw Mills, Boxmoor, in the County of Hertford,
Timber Merchant, do hereby declare the nature of this invention to be as
follows:-
This invention relates to improvements in and connected with that class of
machines by which a number of holes can be drilled at one time and which are
known as multiple boring machines.
According to my invention in boring upright or parallel holes in brush blocks I
use a number of drills cranked at one end as hitherto, which drills are revolved
simultaneously by an improved construction of plate in which the cranked end of
each of the drills takes a bearing and of which plate all points are kept moving in
a circle equal to the throw of the cranks of the drills. For imparting the
necessary motion to my improved plate, however, I employ a novel arrangement of
mechanism comprising a headstock in which are mounted two parallel shafts at a
suitable distance from each other. 1 affix on each shaft and opposite to each other
three eccentrics placed in such a position that three pairs or groups are formed, the
eccentrics of each pair being secured to thoir respective shafts at precisely the
same angle to each other, but each pair being set at such an angle to the others
that the highest points of the three pairs correspond with the points of an
equilateral triangle. Each pair of eccentrics is connected together by the plate or
frame (or it may be by rods) carrying at each end a bearing or journal to fit the
cccentric to which it corresponds and to which it is attached. One of the shafts
being driven, motion will be given by the occentrics on this shaft through tho
plates or frames to the corresponding eccentrics on the other shaft and each of the
three plates or frames will be caused to move in a true circle. To either of
the outer of these three plates or frames may be attached a movable driving-plate
for carrying and revolving the cranked ends of the drills.
Either more or less than three pairs of eccentrics may be used on this principle.
In the case of one pair only being employed for instance the two shafts must be
connected together by suitable gearing.
For boring the slanting holes in brush or broom blocks I use a driving plate
perforated to receive the drill journals and I employ in place of the usual bits or
drills cranked at one end drills which are doubly cranked or bent; or I use single
cranked drills working in combination with single cranked rods or stems of similar
diameter. In the latter case the cranked ends of the drills and the cranked ends of
the rods or stems meat or come together in the journals of the driving plate being
simultaneously revolved thereby and are capable of freely moving forwards or
backwards therein, as will be the case also in using drills with double cranked
stems.
The drills may be made to advance to thoir work in the true line of the holes to
be bored by pressure exerted on the ends opposite to the cutting ends or in the case
of single cranked drills working in combination with single cranked stems by
pressure being exerted in a similar manner on the straight ends of the drill stems.
The drills are advantageously caused to retire or recede from the holes when bored
by means of spiral springs embracing the drill and adjusted between the cranked
portion of the drill and the form plate or by other suitable moans.
Hitherto considerable difficulty has been experienced in truly drilling the form
or bearing plates which hold in position and direct the points of the drills in this

page_text: class of multiple boring machines. These have hitherto been bored in a single
metal or wooden plate or in a series of thin plates fastened together.
According to my invention I make my form or guiding plates in the following
manner. Taking any article, say a brush block which has already been bored to
the pattern required I insert firmly the pointed end of a drill (or a piece of straight
wire or other material of similar size) in each liole of the pattern, the whole being
accurately adjusted. I then place the pattern block with the drills inserted therein
in a suitable box or receptacle forming a mould and pour into the same molten lead,
white metal, gutta-percha or any other suitable metal or material which is pliable
and is capable of being afterwards hardened; so that the spaces between the drills
or dummies and 'the spaces between the drills or dummies and the mould will be
filled up to the required thickness of the form plate. I may adopt this means either
near the points of the drills by allowing the pattern block to represent the bottom
of my casting box or mould, or by first filling up the spaces between the drills or
dummies and between the drills or dummies and the mould with any suitable
material (moulder's sand for instance) and may produce my form plate at any
required distance from the points of the drille.
also make in a similar manner the driving and guiding plates for the drills,
also, in the case of double cranked drills, a plate which it is necessary to place at
the rear of the driving plate to carry the ends of the drills or drill stems on which
pressure is to be exerted to give them the required forward motion.
Where desirable I place on the drill or dummy a thimble or piece of metal or
other tubing of the proper size and of suitable length to form the bearings, tho
said thimble or piece of tube being surrounded by and embedded in the metal.
Dated this 31st day of January 1893.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and connected with Machinery for the Multiple
Boring of Brushes, Brooms; or other Artioles.
I; Alfred FostER, of The Saw Mills, Boxmoor, in the County of Hertford,
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 :—
This invention relates to improvements in and connected with that class of
machines by which a number of Loles can be drilled or bored at one time (as for
instance in brush blocks) and which are known as multiple boring machines.
In the accompanying drawings,—
Figure 1 is a plan partly in section of a horizontal multiple boring machine
constructed according to my invention; and,
Figure 2 is a central longitudinal section of the same :
Figures 3 and 4 are diagrams hereinafter described; and,
Figure 5 is a modification hereinafter described.
Similar reference letters indicate similar or corresponding parts throughout the
drawings.
In carrying out my invention I provide a bed or frame a upon which is mounted
a headstock a' and a work-holder or support a³.
The drills or bits b, are revolved simultaneously by a driving plate c in which
the crank of each of the drills has a bearing and of which plate all points are kept
moving in a circle equal to the throw of the cranks of the drills in a well known
mauner. This plate c is advantageously constructed in the manner hereinafter
described. I also employ the usnal form or guiding plate d for supporting and

page_text: guiding the points of the drills or bits, the said plate ₫ being advantageously
constructed in the manner hereinafter described.
For imparting the necessary motion to the plate c 1 employ a novel arrangement
of mechanism comprising two parallol shafts, el mounted in bearinge f,, 8, 9 in
the headstock a¹ at a suitable distance from each other. I mount on each shuft e, e'
three eccentrics h,h', h³ (or cranks) placed in such positions that throe pairs or
groups h, h, h', and ', are formed, the eccentrics (or cranks) of each pair boing
in line with each other and secured to their respective shafts at precisely the same
angle, as clearly indicated in Figure 3 which represents a diagram of the
arrangement of the said eccentrics.
The eccentrics (or cranks) on each shaft are set at such angles that their centres.
are equidistant or correspond with the points of an equilateral triangle as shown.
The pairs of eccentrics (or cranks) h, h, h', h', h², lare connected by frames or
plates (or by rods) having bearings to fit the corresponding eccentrics (or
cranks). The frame i connecting the eccentrics h, h carries the driving plate o
which is attached to the said frame by screws as shewn. Driving plates
corresponding to different patterns of blocks to be bored can be employed as
required. The shafte is arranged to be driven by means of a pulley so that
motion will be given by the eccentrics (or cranks) on this shaft through the plates
or frames i,i,to the corresponding eccentrics on the other shaft e. By this
arrangement of eccentrics or cranks am enabled to impart the power from ovo
shaft to the other in a regular manner without employing gearing as heretofore and
I can also drive the drills or bits at a much higher speed than when gearing is
employed. In practico I advantageously attach to the two connecting frames i, i
at the rear of the machine a plate equal to the weight of the movable driving
plate e so as to balance the parts.
Either two or more than three pairs of eccentrica or cranks may be usod. When
two pairs are used I arrange the eccentrics (or cranks) on each shaft at right angles
and when more than three pairs are used the eccentrics (or cranks) in each shaft
are arranged so that thoir contres are equidistant.
For boring slanting holes in brush or broom blocks I use the movable driving
plate perforated at the required angle to receive the drill journals and I employ in
place of the usual bits or drills cranked at one end (as is the case with drills used
for parallel work) drills which are doubly cranked or bent, the rear ends of the
drills being supported in an additional form or guiding plate k. For convenience
I may use the double cranked drills in two parts, that is to say, single cranked
drille working in combination with single cranked rods or stems of similar
diameter. In this arrangement, as shewn clearly in Figures 1 and 2, the cranked
ends of the drills b and the cranked onds of the rods or stems ¹ meet or como
together in the perforations of the movable driving plate c, are simultaneously
revolved thereby and are capable of freely moving forwards or backwards therein.
The drills may be made to advance to their work in the true line of the holes to
be bored by pressure exerted on the ends opposite to the cutting ends, or when the
drills are in two parts by pressure exerted in a similar manner on the ends of the
cranked stems. This arrangement is shewn clearly in Figures 1 and 2, 7 being
a plate sliding upon the shafts e, e and adapted to press the whole of the drills
forward by means of forked levers m, m engaging with grooves in bosses l', l' on the
said plate and actuated by a counterweighted foot-lever n.
The pressure may also be applied on the ends of the single cranked drills but I
do not prefer this on account of the reciprocating movement of the cranks of the
drille. This method of feeding the drills forward is also applicable to parallel
drills, the crauks of the said drills being allowed to pass through the driving plate
and be pressed upon by the plate 1. When- the cranks of parallel drills extend
only partly through the driving plate c, as indicated by the dotted lines in Figure 1,
the feed is effected by moving the work-holder towards the drills in the usual
manner.
•
The drills are advantageously caused to retire or recede from the holes when

page_text: "
bored by means of spiral springs a³ embracing the drill and adjusted betweon a
collar a on the drill and the form plate d.
When arranging the drills to work vertically with the drill points uppermost the
weight of the said drills assists in withdrawing them from the work.
Instead of the springs a I sometimes arrange the drills to bo withdrawn by
the plate in its backward movement. This arrangement is shown in Figure 5,
cach drill being provided with a spherical head o embraced by a cup or socket o
on a rod o³, the latter being connected to the plate by two nuts p, p' provided
with rounded faces bearing against concave recesses. By this construction the
rod o' is enabled to vary its angle during the feeding movement of the drills. The
double cranked drills when made in two parts are each connected together where
divided by means of a forew-coupling y so as to withdraw the points of the drills
when the plate moves back, and in order that the said couplings can be easily
applied I advantageously form the driving plato e with a recess or opening o¹ in
which the couplings g are located. It will be obvious that the arrangement just
described for connecting the drills to the plate is equally applicable to parallel
drills.
Hitherto considerable difficulty has been experienced in truly drilling the form
or bearing plated which holds in position and directs the points of the drills in this
class of multiple boring machines. These have hitherto been bored in a single metal
or wooden plate or in a series of thin plates fastened together. According to my
invention I make my form or guiding plates d in the following manner. Taking
any article, say, a brush-block, Figure 4, which has already been bored say, for
spread work, insert firmly the pointed end of a drills (or a piece of straight wire
or other material of similar size) in each hole of the pattern, the whole being
accurately adjusted. 1 then place the suid pattern block with the drills or
wires inserted therein in a suitable box or receptacle forming a mould and pour
into the same molten lead, white metal, gutta-percha or any other suitable metal or
material which is capable of assuming a liquid condition and afterwards of solidi-
fying so that the spaces between the drills or dummies and the spaces between the
drills or dummies and the mould will be filled up to the required thickness of the
form plate. I may make the plate oither near the points of the drills by allowing
the pattern-block ŕ to represent the bottom of my casting box or mould, or by first
filling up the spaces between the drills or dummies and between the drills or
dummies and the mould with any depth of suitable material (moulder's sand for
instance) and thus produce my form plate at any required distance from the points
of the drills. The dotted lines t, represent the thickness of the form plate.
"1
I also make in a similar manner the driving and guiding plates c and k, the
lines, and v, v representing the thickness of the said plates respectively, the
spaces between the said pairs of lines being filled up with moulder's sand or
the like.
Where desirable I place on each drill or dummy a thimble or piece of metal w
or other tubing of the proper size and of suitable length to form a bearing for the
drills, the said thimble or piece of tube being surrounded by and embedded in the
metal or other material.
When making the driving and guiding plates for parallel drills it will be obvious
that the dummies or drills must be arranged parallel with each other in the pattern
block.
Although I have described the machine as being horizontal it will be obvious
that it may be arranged vertically also that threo driving shafts may be employed
operated one from another by eccentrica or cranks as described for the two shafts.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. In a multiple boring machine for boring brush and broom-blocks and other
articles, such machino having shafts for revolving the drills, operating one shaft from

page_text: another by means of eccentrics (or cranks) arranged and connected together
substantially as hereinbefore described.
2. In a multiple boring machine for boring brush and broom-blocks and other
articles feeding the drills into and withdrawing them from the work by means of a
plate common to all the drills, substantially as hereinbefore described.
3. In a multiple boring machine for boring brush and broom-blocks and other.
articles, such machine having drills operated by a common driving plate arranging
the drills for spread work so that they can be fed forward in the direction of their
length, substantially as described.
•
4. In a multiple boring machine for boring brush and broom-blocks and other
articles, the use of double oranked drills for spread work formed in one or more
parts and adapted to be fed forward into the work by pressure applied at the rear
of the drills, substantially as described.
.
5. In a multiple boring machine of the kind described the arrangement whereby
the drills are connected to the plate for pressing them forward, substantially as,
and for the purpose, described with reference to Figure 5 of the accompanying
drawings.
6. The combination of parts forming the improved multiple drilling machine
operating substantially in the mannor hereinbefore described and illustrated in the
accompanying drawings.
7. The method of constructing the form and driving plates for multiple drilling
machines for drilling brush and broom-blocks or other articles substantially as
described with reference to Figure 4 of the accompanying drawings.
Deted this 21st Any of Untahan 1802
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.