Year: 1888

page_text: Date of Application, 25th Jan., 1888
Specification Accepted, 6th July, 1888
like Operations.
I, AMOS WHITNEY, a citizen of the United States of America, and resident of the
City of Hartford, in the County of Hartford, and State of Connecticut, Superintendent,
do hereby declare the nature of the said 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 that class of drilling machines which are used for centering
work previous to turning, and which are provided with one spindle to carry a drill and
another spindle to carry a reamer.
In the drawings, Fig. 1 is a front elevation of a drilling machine embodying my
improvement. Fig. 2 is a top view of same. Fig. 3 is a right-hand end elevation
of same. Fig. 4 is a vertical section of the rocking spindle head and part of the bed,
in line a a Fig. 3. Fig. 5 is a horizontal section of said head in line bb Fig. 3.
Fig. 6 is an enlarged front elevation partially in section of the vise for holding the
piece to be drilled. Fig. 7 is an enlarged top view partially in section of the rest slide.
Fig. 8 is a vertical section on line cc Fig. 7. Fig. 9 is a diagram illustrating the
action of the belts which drive the spindles. Fig. 10 is a section of a part of head H
in line d d Fig. 3. Fig. 11 is a view similar to Fig. 10 illustrating a modification of
the mechanism shown in said Fig. 10. Fig. 12 is a sectional view further illustrating
said modification.
Similar characters designate like parts in all the figures.
The frame or the bed of the machine may have any construction suitable for carrying
the several parts thereon. In the drawings, such a bed is designated in a general way
by B. Said bed has bearings 38 and 39 for the shaft or pivot-bolt 37 on which the
spindle head H swings. Said bed has a bottom 51 sloping to a well or pipe 52, which
is provided to lead off the oil used on the cutting tools; it is supported on legs Nand M,
the latter of which has a bearing 2 for driving shaft O. On shaft O, there is the driving
pulley. A, having face 53 on which runs the belt (not shown) furnishing the motive
power, face 54 from which is a belt 57 to pulley 33 on rear spindle D, and face 55
from which is a belt 56 to pulley 34 on front spindle C.
The spindle head H is so hung on pivot 37 that it may be swung from the position

page_text: shown in Figs. 1, 2, and 3, with the axis of the front spindle C concentric with the
axis of a piece of work held in the vise and rest, to the position shown by the broken
center lines 58 and 59 with the axis of the rear spindle D çoncentric with the axis of
said work. Said head has bearings 60 and 61 for spindle sleeves E and F respectively;
also bearings 62 and 63 for the sleeves of pulleys 34 and 33 respectively. Said head
has bearings 64 and 66 for lock-bolt 28, bearings for lock-bolt 29, and guide slots,
as 68, for the projections 46 on the dogs 40 and 41 respectively. Rotation of the
sleeves E and F is prevented by suitable keys, as 70, and 72 fast in their respective
sleeves, and sliding in ordinary keyways in head H. The spindles C and D are
advanced and retired by a gear G meshing with racks 32 and 31 on sleeves E and F
respectively. Gear G is secured to shaft 13 and is actuated by the handle 24 of
lever Q, which is fixed on the upper end, 25, of said shaft.
Lock bolts 28 and 29 have springs 42 and 43 respectively, which hold the
projections 46 (one only being shown) of dogs 40 and 41 against the ends of
keys 70 and 72, and hold said bolts in their places. Pulley 34 has flanges 36, and
pulley 33 has flanges 35 to hold the belts on the faces of said pulleys. Said pulleys
are held in their respective bearings 62 and 63 by the collar nuts 78 and 79, respectively.
Power is communicated from said pulleys to spindles C and D through the
keys 74 and 75 respectively, secured in their respective pulleys 34 and 33 and sliding
in the keyways 76 and 77 in said spindles. Spindles Cand D are held in their places in
sleeves E and F by collars 48 and 49 fixed to their respective spindles. Spindle C
has a chuck 84 for holding the center drill, 86, and spindle D has the reamer 85 fixed
therein. It does not matter, however, which spindle carries the reamer. The vise
base S best shown in Fig. 6, has formed thereon a T-shaped way, 10, on which the
vise slides 8 and 9 are fitted to move. Fixed to slide 8 is the double vise jaw 5 and
fixed to slide 9 is the single vise jaw 6. Motion is transmitted to jaws 5 and 6
from hand-wheel K through the screw 7 having a left-hand thread in a position of
its length engaging with a corresponding thread in vise slide 8, and having a right-hand
thread in another position of its length engaging with a corresponding thread in vise
slide 9. The horizontal position of the axis of a piece of work held in vise jaws 5 and 6
can be adjusted by means of the threaded sleeve 11 in the threaded clamp 12 formed
on slide S. The vise screw 7 is held in its normal position in sleeve 11 by a shoulder
on the screw and the hand-wheel K. Said hand-wheel is or may be secured to said
screw in the customary manner. By loosening clamp-screw 90, the clamp 12 is
allowed to open sufficiently to permit the externally-threaded sleeve 11 to be screwed
in or out as may be required in any particular case. Base S is held firmly in position
on bed B by means of the ordinary gib 3, and clamp screw 4.
The rest base or
slide T best shown in Figs. 7 and 8 has a projection or boss 22, through which passes
the threaded stem 23 of rest R. Said rest has thereon a crotch or V, for supporting
the work to be operated upon; it has an angular opening of about 122 degrees between
the faces, this being a proper angle for a 7 per inch thread on stem 23.
nut 16 is divided into 4 equal angular divisions, and screw 23 has 7 per inch; one
division on the nut now represents 1-16 inch in diameter of the round bar 30, being
drilled. Rest R is prevented from turning by the key 17 fast in slide T, and which
slides in slot 18 of the stem 23. Said rest is raised and lowered by nut 16 turning on
said stem, the vertical adjustment of the rest imparted by each quarter turn of the nut.
corresponding with 1-16 inch in diameter of the supported rod or shaft. Slot 18 is
graduated, as at 91, Fig. 8, corresponding to the thread on the stem 23, so that the
upper end of key 17 marks the elevation of the rest in turns of the nut 16; these
divisions being further graduated by means of the graduations of said nut, as above
referred to, and as shown in Fig. 7. Slide T is held fast to bed B by means of the
gib 19 and screw 20 turned by lever 21.
The face of
The diagram, Fig. 9, illustrates the peculiar arrangement of the axis 0, of the driving
pulley, the spindle-head pivot 37, and the working position and the idle positions of
the spindles, whereby the respective driving belts are each tightened, when the spindle
driven thereby is shifted from its idle to its working position. One position of the
spindles C and D, with their driving pulleys is shown in solid lines, and one in dotted

page_text: lines.
C denotes, also, the working position of each spindle, which position is
substantially in line with axis 0 and 37. But as point 37 is between C and 0, it is
evident the movement of the spindle away from C, on are 102, will bring said spindle
nearer shaft O, and consequently will slacken the belts, as clearly illustrated in the
diagram by the curved lines representing said belts. Figs. 11 and 12 illustrate a
modification of the devices for limiting the lateral stroke of the spindle head H, and
for detaining the same at one end or the other of its stroke. In this arrangement,
(See Fig. 11) the plate L has a stop, 94; the stop screws 95 and 96 in head H, one at
a time bear against this stop, and also furnish a means for accurately adjusting the
stroke of said head. Below said stop, there is a detent pin, 97, (see Fig. 12) held out
by spring 98, against the beveled detent-faces 99 or 100, as the case may be. The
bearing surfaces being properly inclined, the detent does not positively hold the head H
in position, but in practice does so with a sufficient force.
The operation of my improved centering machine is as follows: The several parts
of the machine being at rest in the positions shown in Figs. 1 and 2, with the spindle
head swung to its rear position and the spindles furnished with a drill and reamer and
the work to be centered securely held in the vise, the pulley A is started revolving in
the direction shown by the arrow on belt 57 Fig. 1 thereby rotating through
belts 56 and 57 the spindles C and D. Spindle C carrying drill 86 is now moved
toward and into the work by moving handle 24 of lever Q in the direction shown by
arrow 50, Fig. 1. Said movement of handle 24 turns the gear G, which meshes with
rack 32 in sleeve E and rack 31 in sleeve F, in the direction shown by the arrow on
said gear in Fig. 5, as sleeve E and spindle C goes forward spring 42 pushes lock
bolt 28 into hole 26 in lock plate L, thereby locking head H firmly in place.
(See Fig. 4.) In feeding spindle C forward, spindle D is moved back from the
position in Figs. 1 and 2, through a distance equal to the distance through which
spindle C is moved forward. After drill 86 has been fed to a sufficient depth, the
movement of handle of 24 is reversed and continued in the opposite direction thereby
withdrawing spindle C and advancing spindle D. This movement is continued until
the position shown in Figs. 1 and 2 is again reached, and the lock bolts are both
removed from the lock plate L as shown in Fig. 10, when said handle is pressed down,
thereby swinging head H to its forward position with spindle D in the position
previously occupied by spindle C. Continuing the backward movement of said
handle 24 the reamer 85 is now carried forward and into the work by spindle D in
sleeve F. As said sleeve goes forward spring 43 pushes lock bolt 29 into hole 27 in
lock plate L thereby locking head H firmly in place. Reamer 85 having been fed to
a sufficient depth the direction of the movement of handle 24 is again reversed, being
now in the direction indicated by arrow 50. The movement in this direction is
continued until both lock bolts are again removed from lock plate L, when the operator
lifts the handle, thereby swinging head H back into the position shown in Figs. 1 and 2.
The several parts of the machine are now in their original position ready for a
repetition of the whole operation.
It will be understood that the use of my improved machine is not limited to centering
work, for the spindles C and D may be supplied with a drill and counterbore, or with
other tools of a similar character, for making screw holes, and like work.
It will also be understood that this machine is capable of modification in various
ways and degrees, after the manner of machines in general, within the scope and limits
of my invention.
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 in a drilling machine, of a latterally swinging head carrying two
revolving and sliding spindles, a lever pivotally mounted on said head, whereby the
head may be swung latterally on its pivot, and connecting gearing substantially as
described whereby the spindles are both operated from said lever, all substantially as
ent fouth

page_text: 2. The combination in a drilling machine, of a vise holding the piece to be drilled
in a fixed position, a latterally-movable head carrying two revolving and sliding
spindles, a lever connected to actuate said spindles, and serving at the same time to
shift said head, and a lock or detent temporarily holding the head at one or the other end
of its stroke, all substantially as set forth.
3. The combination in a drilling machine head, of spindles, C, D, sleeves E, F,
gear G, and a handle described and constructed to operate said gear, substantially as
set forth.
4. The combination with the head H, and lock-plate L, of the sliding sleeve E,
carrying the spindle, bolt 28, sliding in said head, and fitting into said plate, a spring
acting on the bolt and arm 46 adjustably fixed on said bolt and operated in one
direction from said sleeve, all substantially as set forth.
•
5. The combination in a drilling machine of the class specified, and with a spindle-
head swinging on a pivot, of two pulley provided spindles carried by said head above
said pivot, driving pulleys below said pivot, and belts connecting each of, said driving
pulleys with the corresponding spindle pulleys, the whole being organized and arranged
to tighten either belt on shifting the spindle driven thereby from its idle to its working
position, as shown and described.
6. The combination with the vise base, and with slides 8 and 9 sliding thereon, of
the right-and-left screw 7, the externally-threaded sleeve.11; and the clamp 12 on said
base, the sleeve being adjustable longitudinally by the turning of it, in said clamp, and
the screw being journaled in said sleeve, substantially, as described."
Dated this 24th day of December 1887.
AMOS WHITNEY..
Day, Davies & Hunt,
321, High Holborn, London, W.C.,
Patent Agents.