Improvements in Apparatus for Drilling Brooms and Brushes.
Year: 1890

page_text: Date of Application, 22nd Dec., 1890
Complete Specification Left, 21st Sept., 1891-Accepted, 24th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Drilling Brooms and Brushes.
WC, GEORGE HAROLD KENT, ARTHUR BARTON KENT. and ERNEST NEILD
KENT, trading together as G. B. Kent & Sons, of 15 Robinson Road, Victoria
Park, in the County of Middlesex, Manufacturers, and HYPPOLITE BESSON of
46 Bonner Road, Bethnal Green, in the said County of Middlesex, Mechanical
Engineer, do hereby declare the nature of this invention to be as follows:-
-
This apparatus is of the class in which a number of drills having equal cranks at
their ends are carried in bearings in a plate, the crank pins working in bearings in
another plate every point of which is caused to move in a circle so that all the
drills are rotated simultaneously.
According to this invention this second plate is driven by a single crank and is
prevented from turning about the crank pin by being so guided that at any time all
points in it move parallel to each other. Preferably we guide the plate by means
of a number of cranks equal in throw to the driving crank but which are not
driven; these cranks carry counterbalance weights to balance their weight and the
weight of the moving plate; by this means a very steady motion even at high
speeds is obtained.
In cases where the drills, in place of being parallel to each other, are all directed
radially towards a common point cach plate is a portion of a sphere having this
point as its centre. The crank pins of the drills also radiate to the same point.
In the case of parallel drills the moving plate may also be guided by being
mounted in rectilinear guides on a plate which in its turn is free to move in fixed
rectilinear guides at right angles to the first.
For producing holes which are inclined to each other but do not radiate to a
single centre similar arrangements may be adopted, motion being given by a moving
plate to a number of cranks whose axes work in bearings in a fixed plate as above
described, but in this case the motion must be conveyed from the axes to the drills
through universal joints or flexible shafts.
Difficulty is experienced in accurately boring the long small holes in the fixed
plate which form the bearings for the drills. In order to obviate this difficulty we
build up the fixed plate with a number of thin parallel plates, it being more easy
to bore the holes truly in a thin than a thick plate, and even if some of the
holes in some of the plates are slightly inaccurate this error is corrected by the
other plates, the plates being capable of adjustment relatively to each other by set
screws or other means.
n
7
COMPLETE SPECIFICATION.
Improvements in Apparatus for Drilling Brooms and Brushes.
We, GEORGE HAROLD KENT, ARTHUR BARTON KENT, and ERNEST NEILD
KENT, trading together as G. B. Kent & Sons, of 15 Robinson Road, Victoria
Park, in the County of Middlesex, Manufacturers, and HYPPOLITE BESSON, of
46 Bonner Road, Bethnal Green, in the said County of Middlesex, Mechanical
Engineer, 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 apparatus is of the class in which a number of drills having equal cranks at

page_text: place between the inclined surfaces of the jaws and is secured by bolts gl g'. The
face of the plate y is perforated with holes 2 which accord in arrangement with
the holes to be bored in the brush back. When a change is to be made in the
pattern of the work the plate g is replaced by another plate in which the arrange-
ment of the holes is suitable. The pattern journal is changed simultaneously.
hare the drills, their stems are bent to form cranks corresponding in throw to
the cranks which actuate and control the driving plate. The rear ends of the drill
stems are inserted into the holes g². The plate y has a cavity ³ within it which is
intended to contain grease and there is a movable back or lid g which serves to close
the cavity in rear. 9 is a thin plate of hardened steel within the cavity ³ and on
this plate the stems of the drills abut. The pattern journal consists of a box i in
which are a series of plates . . These plates are bored with holes for the passage
of the drills and the plates are kept in place by front and back cover frames ² 12
and by pressure screws ³ ³ which press the plates together. For the more accurate
adjustment of the plates screws kk are provided in the ends of the box i, these
screws act upon strips within the box and press them forward causing them to
bear upon alternate plates. The interior of the box i may when the machine is at
work be charged with grease. is a perforated plate supported at the front of the
box i by coiled springs. When the work is pressed up towards the drills the
plate yields freely and when the work is withdrawn the plate comes forward
again and clears the wood dust or debris formed in the boring operation away from
the points of the drills.
The pattern journal is mounted upon a saddle which is clamped down to the bed
of the machine but which when necessary can be adjusted in its position to and
from the head stock. m mare standards rising from this saddle. The box i is
made with four lugs and tee headed bolts n n pass through elongated holes in
these lugs. The heads of the bolts are held in cavaties prepared for them in the
standards m. oo are adjusting screws for adjusting the position of the box i
laterally and p are other screws by which it is supported at the right height.
When it has been accurately set the pattern journal is clamped fast to the
standards mm by tightening the nuts on the bolts n .
Any suitable arrangements may be made for presenting the brush backs to be
operated upon by the drills; preferably we arrange another saddle upon the bed of
the machine and on the saddle, a slide which automatically or otherwise is made to
advance to and recede from the drills. The slide is provided with clamping jaws
to nip and hold the work and adjusting screws are employed to set it accurately so
that the holes may fall in the positions desired.
In Figures 10 and 11 the drills radiate from a central point and instead of being
cranked or bent in themselves, they are fixed into cranked drill stems to which
they are locked by means of set screws. 7 are plates in which are holes serving
as bearings for these drill stems. The driving plater has a face of spherical form
into which the cranked ends of the drill stems are also inserted and the plate
receives a spherical movement; that is to say every point in the face of the plate
is made to move in a path lying on the surface of a sphere and about the common
centre. The path in each case is circular and corresponds with the throw of the
cranked drill stems. The driving plate is actuated by the crank s on the axis s³ ;
there are also bell pulleys s² 2 on the axis s. The controlling cranks t t also
engage with the driving plate as the drawing shews. The axes of these cranks
and the axis are all set radially to the cominon centre. In order to ensure
smooth running at high speeds we provide cone pulleys fastened on the axes ¹;
they are arranged to be in light contact with another cone pulley which is
mounted so that it can revolve freely on the axis »'. is the pattern journal, it is
similar in its construction to that already described.
じ
The pattern journal is mounted on a slide on the saddle which slide also carries
the work holder was seen in Figure 10. This work holder is provided with
clamping jaws and adjusting screws as before stated.
A cam advances the work slide and holder towards the drills and withdraws it

page_text: when the drills have penetrated sufficiently deeply. The cam has on its axis a
worm wheel with which a worm y engages. The worm is loose upon a shaft geared
as shewn with the axis s' and it can be made fast with the shaft by a clutch when
the work is ready.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. Drilling apparatus. in which a number of cranked or bent drills are simul-
taneously rotated by means of a driving plate into which the cranked ends of the
said drills are inserted; such driving plate receiving circular movement from a
single driven crank and being guided by a number of freely rotating guiding cranks
substantially as described.
2. In combination with the subject matter of the preceding claim; counterbalance
weights upon the freely rotating guiding cranks compensating the weight of the
driving plate substantially as described.
3. Drilling apparatus in which a number of drills are carried in a compound
bearing or pattern journal consisting of a box or holder containing a series of plates
with holes for the passage of the drills and with suitable appliances for holding the
plates in position substantially as described.
4. Drilling apparatus in which a number of cranked or bent drills are set radially
and are simultaneously rotated by means of a driving plate into which the cranked
ends of the said drills are inserted; such-driving plate where-it-receives the drills
having a face of spherical form and receiving a spherical movement from a driving
crank and guiding cranks on radial axes substantially as described.
5. Drilling-apparatus-substantially as described and shewn.
Dated + 10+1001
G. HAROLD KENT.
ARTHUR B. KENT.
ERNEST N. KENT.
H. BESSON.
G. HAROLD KENT.
ARTHUR B. KENT.
ERNEST N. KENT.
H. BESSON.