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Патент USA US2411265

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Nov. 19, 1946.
J. HALL
2,411,265
MACHINE FOR MAKING CIRCULAR LATHE BRUSHES
Filed May 15, 1943
2 Sheets-Sheet l
NOV. 19, 1946.
J, HALL
2,411,265
MACHINE FOR MAKING CIRCULAR LATHE BRUSHES
Filed May 15, 1943
2 Sheets-Sheet 2
2,411,265
Patented Nov. 19, 1946
UNITED STATES PATENT OFFICE
2,411,265
MACHINE FOR MAKING CIRCULAR LATHE
BRUSHES
James Hall, Leeds, England, assignor to Kings
wood Manufacturing Co. Limited, Letchworth,
Herts, England, a company of Great Britain
Application May 15, 1943, Serial No. 487,173
In Great Britain May 26, 1942
7 Claims.
(C1. 300-.-3)
2
1
This invention relates to machines for making
circular lathe brushes, especially circular dental
lathe brushes, with rows of converging bristles,
i. e._. machines which drill the brush stocks and/or
?ll drilled stocks with bristles, Brushes of this
type comprise a cylindrical wooden stock which
is drilled all around its cylindrical face with two
inserting means 4, 5. Each of the stock holders
comprises a pair of side arms and a rear part
with a web between the arms carrying a rotatable
stock receiving pin 5. The forward ends of the
arms have resilient buffer means 1 associated
with the pivot pins 2 which support the holder
and the back face of the rear part has a cam
or more rows of holes, staggered in relation to
face 8 working against the rounded front endof
may be duplicated with a common control device
on a combined drilling and bristle inserting ma
chine.
track it which acts as a support for the rear of
the holders, The latter are tied together by a
cross bar 52 with a pendant arm is intermediate
the operating arm 9. In this manner a stock
one another and running parallel with the side
faces of the stock, into which bristles are inserted. ll) holder i can be moved about its pivots 2 with a
stock iii thereon and an even depth of hole will
The brush in use is rotated at high speed for
be maintained in the different rows in relation to
buf?ng dental plates or the like.
'
the straight stock face being tilted. The general
The main object of this invention is to improve
construction and arrangement of the machine
the machine stock holders and their control de
parts for operating the stock holders ! towards
vices, that is, each stock holder is pivoted to allow
and away from the means 4i and 5 are of known
a stock to be tilted or inclined for changing its
type and the only members shown are the arms
position so that different rows of holes can be
6 (which are tied together and slide horizontally
drilled at the correct angle and a supporting cam
in the machine frame) to which the carrier heads
track is furnished for enabling such movement
and angle of presentation to be effected at will by 20 3 are secured. The arms are reciprocated'tin
bearings by a rocking lever in known manner.
a single operative movement. This arrangement
The device for tilting the stock holders I about
is equally applicable to the stock holder which
their pivots 2 after the ?rst simultaneous drilling
supports a drilled stock during the bristle inser
and filling operations, comprises a stepped cam
tion operation. Furthermore‘ the stock holders
Another object is to advance automatically,
during the tilting movement of the stock holder,
the means which rotate the stock, so that the
holes of a subsequent row will be staggered in
relation to the holes in the previous row.
Referring now to the accompanying drawings,
an embodiment of the invention is shown by way
' of example and will be described as applied to a
combined drilling
bristle inserting machine,
wherein a pair of stock holders are adapted to be
advanced towards and away from the drill and
bristle inserting means.
.
Fig. .l is a part sectional side elevation showing
one of the stock holders and the control means;
Fig. 2 is a sectional side elevation of a stock
holder;
Fig. 3 is a plan view showing the general ar
rangement of the stock holders and mechanism;
Fig. 4 is a plan view,‘ from beneath, of the
mechanism for rotating brush stocks, and
Fig. 5 is a fragmentary view, partly in section,
oi the cam track and associated member for im
parting a step-by-step angular adjustment to the
stock holders.
A pair of stock holders l are pivoted at their
front ends by pins 2 to a pair of bifurcated car
rier heads‘3 arranged on the machine behind,
and in alignment with, the drilling and bristle
its ends having a roller iii (in two parts) at its
lower end working in a slot Ma formed in a hori
zontal member 65. rl‘he roller is divided at its
center (for mounting purposes) with end flanges
tic-b, i. e. like a transversely split bobbin.
In this .
manner although the member i5 is secured to the
top of a vertical cam rod is which rests on the
stepped cam track ii and is supported freely in a
stationary boss ll’ (?xed to the machine frame)
to have a rising and falling motion under the
control of the cam track, the ?anges Mb main
tain the relative positions of the roller Ill and
the guide member !5.' Also, the member 15,
which is merely the supporting link between the
arm island the cam rod I6, is slotted because
the arm is has a horizontal reciprocatory move
ment with the stock holders I whilst the rod [6
has a vertical reciprocatory movement in the
?xed boss ll. The cam track i! is extended for,
wardly in the form of a handle l8 which may be
supported by the machine frame and the cam
track itself is supported in the boss I‘! in which
the cam rod works. As the handle I3 is pushed
in, the cam rod l6 slips from the top step of the
cam track itself down an incline to the next step
so that the horizontal slotted member 15, the
pendant arm !3 and the cross bar l2 all fall caus
ing the stock holders l to tilt downwardly about
2,411,265
4
their pivots 2. The stocks ID are now at the cor
the pawls 26 are released temporarily by manual
operation of the trip member 29 and the cross
bar l2 pulled up by means of, say, a handle 35
rect level and angle in relation to the drilling
and ?lling means 4, 5, for a second row of holes
to be drilled and ?lled, The cam track can
again be operated for a further row (or rows) of
holes and is stepped to correspond with the num
ber of rows of holes it is desired to drill and ?ll.
To retain the cam track in each adjusted position,
the handle it is notched to receive a spring actu
ated lever l9.
_
To afford adjustment for varying the number
when the stepped cam track 3! can be pulled for
wardly its full extent.
It is to be understood the invention may be
applied to separate drilling and ?lling machines
and that it can be modi?ed in a variety of ways
without departing fromthe scope thereof,
10
What I claim is:
1. In a machine for making cylindrical brushes
of rows of holes in a stock, di?erent sizes of spac
of the dental lathe type, a stock holder, a pin
ing collars Fill may be inserted between the cross
rotatably supported on said stock holder for re
bar i2 and pendant arm is to pivotally lift or
ceiving a cylindrical brush stock, a carrier head
lower the stock holders with respect to the 15 having pivot means supporting the forward end
stepped cam track and so centralize the stocks
of said stock holder for angular movement to
with the drill and ?lling means. Other adjust
present the stock to work devices so that different
ing means may be employed. Make-up washers
rows of holes may be drilled or ?lled with bristles
2! are also used on the stock receiving pins 5 for
at the correct angle, means supporting said car
the stocks to rest on so as to allow for diilerent
rier head for reciprocatory movement with re
widths of stocks and a top and bottom clamping
spect to said work devices, and means connected
washer 22 grips each stock. To support Or brace
to the rear end of said stock holder to support
each of the pins 6 against the pressure of the
the stock holder for reciprocation with said car
drilling and bristle inserting means 4, 5, a pivoted
plate 23 has its bifurcated outer end dropped on 25 rier head, said supporting means being adjustable
vertically to effect the desired changes in the an
to the upper stock clamping washer 22 before the
gular presentation of the cylindrical brush stock.
nut 25! is located on the pin.
2. In a machine for making cylindrical brushes
To enable the distance between the rows of
of the dental lathe type, the invention as recited
holes to be adjusted, the head of the aforesaid
in claim I, wherein said supporting means in
pendant arm i3 is secured in a transverse slot 12a
cludes a cam rod engaging a stepped cam track,
in the cross bar I 2 so that the effective radial dis
a horizontally slotted member secured to said rod,
' tance between the roller M and the stock holder
an arm secured to the rear portion of said stock
pivots 2 may be varied at will by movingr the arm
l3 in said slot slightly nearer to or further from
said pivots for adjusting the actual arcuate move
ment of the stock holders.
The stock receiving pins t are rotated by
ratchet wheels 25, which are operated by pawls
holder, and a roller carried by said arm and co
35 operating with said slotted member to support
the rear end of the stock holder for reciprocatory
movement.
3. In a machine for making cylindrical brushes
of the dental lathe type, the invention as recited
26>carried by brackets 21, mounted freely on the
bosses of the ratchet wheels, linked together by 40 in claim 1 wherein said supporting means in
a cross rod 28 and a trip member 2% engaging a
stationary roller 36 each time the bifurcated
cludes a cam track, a cam engaging device having
a horizontal slot at its upper end, an arm secured
to the rear end of said stock holder and carrying
means cooperating with said slotted device to
heads 3 are retracted by the machine mechanism
(not shown) to a normal position. The arrange
ment is to advance the ratchet wheels 25 tWo 45 guide said stock holder during reciprocatory
movement thereof.
,
e
teeth each time during the operations on any one
‘i. In a machine for making cylindrical brushes
row of holes, and to start the next row (having a
of the dental lathe type, the invention as recited
in claim 1 wherein said supporting means in
from the'last hole of one row to the first hole of 50 cludes a cam track and means automatically
locking the same in each adjusted position.
the next row.
5. In a machine for making brushes, a stock
'
holes in adjacent circumferential rows
holder including a rotatable pin on which a cy
are thereby, staggered, and the falling move
ment of. the stock holders I is arranged auto
lindrical brush stock may be secured, pawl and ’
matically to rotate the stocks it] the required 55 ratchet. means for imparting angular movement
to said pin, a reciprocatory carrier having pivot
amount. As the stepped cam track ll lowers the
similar spacing for the‘ holes) after advancing the
ratchet wheels only one tooth during the change
stock holders, a member 3! secured on the cross
means mounting said stock holder for tilting
link rod 28 of the pawls 26 bears down on to the
movement about an axis normal to the axis of
nearest one of a series of ?xed pins 32 (whose
said pin, means including a cam track and cam
free ends are chamfered off to form downwardly 60 rod for imparting a step-by-step tilting move
inclinedv cam tracks), so that as the rod 28 is
ment to said stock holder, and means actuated by
capable of axial movement against the action
said stock holder during movement thereof to
of its return spring 33 (anchored to the adjacent
operate said pawl and ratchet means to impart a
stock holder I) the member 3! slips laterally and
downwardly off the pin 32, causes the rod 28 to
move axially which through the pawls 26 ad
' vances the ratchet wheels 25 one tooth and so
staggers the holes in the next row, As the mem
step advance to said pin.
7 ,
6. In a machine for making brushes, a stock
holder including a rotatable pin- on which a cy
lindrical brush stock may be secured, pawland
ratchet means for imparting angular movement
her 3! slips off the pin 32 (carrying the rod 28
to said pin, a reciprocatory carrier having pivot
with it) it’is immediately pulled back above the 70 means mounting said stock holder for tilting
next pin 32 by its return spring. A locking pawl‘
movement about a horizontal axis normal to the
its for each wheel 25 ensures correct engagement
axis of said pin, supporting means adjustably
between the operating pawls ‘and the ratchet
connected to said stock holder at a point spaced
from said pivot means, said supporting means
To raise the stock holders to a normal position 75 including a vertically arranged cam rod extend
wheels.
'
,
1
214112635
5
ing below said stock holder and resting upon a
cam track, whereby displacement of the cam
track imparts a tilting movement to said stock
holder, and means actuated by the stock holder,
during movement thereof to operate said pawl
and ratchet means to impart a step advance to -
said pin.
'7. In a machine for making brushes, a pair of
laterally arranged stock holders pivotally sup
ported on reciprocatory carriers for tilting move
ment about a horizontal axis, a pin journalled on
each stock holder ‘on which a cylindrical brush
stock may be secured, a cross bar connecting said
6
stock holders, means includinga cam track and
vertically movable cam rod coupled to said cross
bar for supporting said stock holders in di?erent
positions of adjustment about their axis of tilt
ing, pawl and ratchet means for imparting angu
lar movement to each of said pins, means opera
ble by reciprocatory movement of, said stock hold
ers for actuating said pawl and ratchet means
for imparting angular movement to said pins,
and means for actuating said pawl and ratchet
means upon displacement of said cam track to.
tilt said stock holders.
JAMES HALL.
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