Improvements in Screw Cutting and Pointing Machines.
Year: 1892

page_text: COME LEIE STECIFICATIVA.
Improvements in Screw Cutting and Pointing Machines.
A communication by EDWARD T. GILBERT and LOUIS SEVIGNE, both of the
City of Detroit and County of Wayne, State of Michigan, United States of
America.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E. of the Agency for
Foreign Patent Solicitors 6, Lord Street, Liverpool and 6, Bank Street.
Manchester both in the County of Lancaster and 323 High Holborn in the
County of Middlesex, Civil 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 invention relates to certain improvements in screw entting and pointing
machines, and more particularly to machines for cutting screw threads upon screw
bolts, where they are used as screw cutting machines.
Hitherto in the manufacture of screw bolts it has been found difficult to thread
the tapering point and the attendant has fed the bolts singly to the dies which
have necessarily had to travel along the bolt several times to cut the thread
deep enough. This has consequently been a slow and unsatisfactory process.
It is one of the main objects in this invention to provide a machine which
will cut threads upon both the body and the point of the bolt in one and the same
operation, and which will cut the threads of the required depth in both at a
single travel of the dies and cutters along the bolt. Another object of the
invention is to cut a conical point on a bolt or screw. The invention is therefore
calculated to greatly facilitate the manufacture of screw bolts and to reduce the
cost of manufacture.
With this object in view the machine is made automatically operative and of
such capacity as to point or thread the bolts rapidly. To this end certain
portions of the mechanism are duplicated to double its capacity and save hand
labour.
The invention may be understood from the following description, reference
being had to the accompanying drawings, in which,
Figure 1 is a plan view. of a machine embodying the invention;
Figure 2 a side elevation of the same;
Figure 3 an end elevation thereof;
Figure 4 a vertical cross section on the line, Figure 1 ;
Figure 5 a vertical cross section on the line - Figure 1;
Figure 6 a vertical longitudinal section of a portion of the mechanism on the
line, Figure 1 ;
Figure 7 a separate and enlarged view of a set of die heads and the under-
lying bed plates;
Figure
Figure 9 a side elevation of one of the lower die heads;
an elevation of one of the upper die heads;
Figure 10 a view in section on the line y-y in Figure 7;
Figure 11 a view ia perspective of one of the cutter heads;
Figure 12 a vertical section through the friction clutch;
Figure 13 a view of one of the carriages which carries the chuch;
Figure 14 a detail view in side elevation showing the locking and releasing
mechanism connected with said carriage;
Figure 15 a plan view of one of the guide plates;
Figure 16 a perspective view of a portion of the same;
Figure 17 an elevation of the end opposite Figure 3;
Figure 18 a plan view of the chuck;

page_text: Figure 21 a rear elevation of the same;
Figure 22 a horizontal section through the chuck and the shaft upon which it.
is mounted ;
Figure 23 a detail view of the feeding device showing the feeding arms in
position about to take a bolt from the feeding shute;
Figure 24 a view of the same from the opposite side in position about to deliver
a bolt to the chuck;
Figure 25 a front elevation of a portion of the feeding mechanism;
Figure 26 a cross section showing the gripping jaws engaged with the dog
Figure 27 a separate view of the guide lug on the under side of one of the
die heads;
Figure 28 a section across the gripping jaws and guide bar showing a bolt
engaged thereby ;
Figure 29 a separate view of the arm 16;
Figure 30 a view of a blank bolt to be threaded;
Figure 31 a view of a bolt when threaded by the improved machine;
Figure 32 a view in perspective of the dog e²;
Figure 33 a plan view of parts of the machine, and
Figure 34 a detail view of mechanism for holding the feeders to allow the bolt
to be threaded a desired distance.
In carrying out the invention,
A represents any suitable supporting frame, A' is the driving shaft suitably
journalled on the frame, provided with pulleys a, a, a, providing for the shifting
of the driving belts A and reversing the motion of the machine in a well-
known manner by crossing one of the telts. A is a belt shifting device which
will be more fully hereinafter described.
The driving shaft is provided with a pinion a³ meshing with a gear B, on a
shaft B' properly journalled on the frame. This latter shaft is provided with a
pinion meshing with a gear B2, the shaft which is provided with a pinion
meshing with a gear B³, the shaft of which is provided with a gear meshing
with gears B B to turn them in the same direction. B B7 are the shafts on
which the gears B* B* respectively are mounted. These shafts carry auto-
matically operated feeding arins CC for carrying the bolts to the dies and
cutters.
D is a chuck to engage the head of the bolt and hold it while it is being
threaded. This chuck is engaged upon the shaft . The shaft B' runs longi-
tudinally of the machine and is threaded to form a feed screw. At the end
thereof opposite the driving pulleys said shaft is provided with a pinion b*
meshing with a gear on the shaft 6 on which is engaged a chuck D¹ corre-
sponding to the chuck D forming a duplicate thereof. The special construction
of these chucks will be further referred to.
E E denote feeding shutes within which the bolts are placed by the
attendant, the shutes being open at their upper ends for their reception.
Through these shutes the bolts are fed to the feeding arms C C³ respectively.
Each shute is provided at its lower end with a spring actuated retaining arm E*
hinged thereto on the lower side as shown at e so constructed as to normally
close the base of the shute and hold the bolts therein. On the opposite side
from the arm E, the base of the shute is open to allow the feeding arms to
enter and pick out the lower bolt as at E. E is the support for the shute.
The feeding arms CC oscillate back and forth, and each consists essentially
of an arm C engaged upon one of the shafts B B', said arm at its outer
extremity being provided with a fixed beak or jaw C³ and with a spring actuated
pivoted beak or jaw C. The pivoted engagement of the latter is shown at c'.
The points of said jaws are so formed that the fixed jaw C, in operation,
enters the shute between the lower bolt and the one above, the bolt being

page_text: caught between the ends of the jaws in the downward throw of the arm C³,
the spring C engaged with the outer end of the beak C and with the arm C³
securely clamping the bolt between the jaws as it is carried from the shute to
the chuck below. In this operation, the arm E' springs back to allow the
feeding arm to pass, the upper surface of the jaw C serving to hold the
remaining bolts in the shute as the feeding arm passes along, until the arm E³
has opportunity to fly back into normal position.
E' is a guide bar lying adjacent to the path of the feeding arm to crowd the
bolts laterally in the gripping jaws to bring their heads into proper alignment
for their engagement by the chuck.
To more effectually bind and hold the bolts in the gripping arm, the gripping jaws
are so constructed and arranged in connection with adjacent parts that they cannot
be released from the bolt until the bolt is past the base of the feed channel or
shute. To this end, the jaw C4 is provided with a lateral flange c² at its outer
end, and the bar E is provided with an outstanding dog e to engage upon the
upper surface of said flange as the flange is carried downward. The effect, as
will be readily seen, will be to exert a strong leverage to force the corresponding
jaw upon the bolt and effectually prevent any unseasonable loosening thereof.
When the chuck has grasped the bolt, the feeding arm is retracted by the
reversal of the driving mechanism to its normal position.
On the shaft is located a friction clutch F' consisting essentially of an
inner head, F, provided with a hub F³ keyed upon said shaft. Thus this head
has a fixed engagement on the shaft and always rotates therewith. Over this
inner head is located a shell F made in two parts ff, having a movable or
loose engagement upon said hub, and which may be tightened upon the inner
head as desired by means of screws f uniting the parts ff. Between the shell F
and the inner head and on either side of said head are placed two washers f
of leather or other suitable material. As so constructed, it is evident that the
shell will slip when the strain overcomes the friction of the shell upon the inner
head. Upon this shell the gear is engaged which rotates the gear B³ actuating
the shafts B B' when the clutch is operative. To limit the movement of the
feeding arms, the shafts upon which they are engaged are provided with stops C³,
arranged to strike upon a corresponding stop C so located as to receive the
impact of the former stop on the downward movement of the arm when it has
reached the desired point. The consequence is to cause the slipping of shell F*
upon the head F' until the driving mechanism is reversed. G and G' are cross
heads having a reciprocatory movement upon the frame A by means of the
feed screw engaged therewith, the cross heads being duplicates one of the other
and carrying duplicate mechanism for holding and actuating the screw threading
discs and cutters.
Each cross head is preferably provided with a double set of die and cutter
mechanisms to facilitate the operation of cutting the threads.
G and G³ denote bed plates having a laterally movable engagement on the
underlying cross head to allow the dies and cutters to be retracted from and
advanced to the work. To this end, the bed plates may have a dovetailed engage-
ment on the cross head as shown at g.
H and H' represent a set of die heads mounted on said bed plates and having a
movable engagement thereupon. To guide the movement of the die heads, the
frame A is provided with guide plates J constructed with a guide way J¹, and
guide flanges J, J, J, said guide plate being preferably made with double
guide ways and flanges to operate each set of die heads at each end of the
machine.
It will be seen that the two cross heads G G are located between the two
chucks D D and that when they reciprocate they move in opposite directions to
carry the dies and cutters to the work. Consequently on the guide plates the guide
flanges and ways are correspondingly formed and arranged.
The die heads are each provided with a guide lug H constructed and arranged

page_text: guine way or the giae plate thereby to direct the
course of the die head as desired.
The guide flange J, it will be seen, constructed with an angular face adjacent
to the guide way, forces the corresponding die head inward as the cross head moves
longitudinally. The flange J holds the die head to the work while the dies and
cutters are doing their work.
The flanges J' direct the die heads away from the work.
Haud H represent a set of dies engaged with the die heads H H respectively
arranged to cut the threads on the body of the bolt. K and K' denote cutter heads
engaged upon the bed plates G G³ carrying cutters K' K³ arranged to cut the
threads on the bevelled point of the bolt.
These cutters are preferably removable to allow different kinds of cutters to be
employed. In this way, single or multiple threads can be cut upon the points
as may be desired. Ki denotes a set screw to hold the cutters in place in the
cutter head.
Accord-
It is found desirable to give to the cutter heads a yielding movement.
ingly they have each a jointed engagement with the corresponding die head
as shown at K, a spring K being provided to keep the cutter to its normal
position.
It is also found advisable to locate the die on the one side of the bolt so as
to cut above the horizontal centre of the bolt and the other die so as to cut on the
under side of the bolt. To this end the die heads H and H are arranged one as
an upper die head, and the other, the lower die head. So also the cutters are
arranged in a corresponding manner and the cutter heads are likewise arranged.
one as an upper cutter head and the other as the lower cutter head. In so arranging
the die heads and cutter heads, it will be convenient to have the jointed union of
the cutter heads with the die heads, the one above and the other below the bed
plates G² G³.
In Figure 8, therefore, the jointed union is shown above, and in
Figure 9 it is shown below, the two heads being formed with bracket arms hk, at
the extremities of which is the jointed union K³, to allow for the yielding of the
cutter head.
The cutter heads are provided at their outer ends with guide rollers K' to form
a movable contact with the side of the adjacent guide, plate, said plate at the side
being provided with a lateral guide strip J secured thereto and preferably
adjustable thereon. As the roller rides along the face of the guide strip, it will be
moved inward or outward thereby, and the movement of the underlying bed plate
may carry the roller outward and away from .contact with said strip. The die
heads are provided with jaws to engage the bolt on either side toward the
extremity to be threaded and hold it firmly. The cross heads G and G' are held
in suitable adjustment with each other so that each will move the required distance
by an adjusting screw G threaded in opposite directions, by rotating which the cross
heads will be moved nearer together or further apart as required to regulate their
position in accordance with the length of the bolt to be threaded. As so constructed
and arranged, it is evident that the dies and cutters feed back laterally to open
and release the bolt and feed forward to close upon the work. As shown, the
cutters are arranged so that their cutting edges lie at an angle to the dies so as
properly to engage the bevelled point. Moreover, the operation and relation of
the chuck and the cutting mechanism one to the other are such that, just before
the opening of the dies, the chuck springs back into normal position allowing the
bolt to drop. The dies are also so arranged that one cuts a little in advance of
the other.
L denotes the belt shifting bar provided with devices to engage the belts and
with movable collars l'engaged thereupon. By the proper adjustment of these
collars, the shifting bar is thrown a longer or shorter stroke. L' is a rod engaged
upon the adjacent cross head and provided with adjustable collars 1, the adjustment
of which determines the length of the threaded portion to be cut on the bolt. L³ is
a transverse rocker bar provided with weighted arms L, L. L is a slotted arm

page_text: on the rocker bar through which the rocker bar passes extending upward to be
engaged by the collars . It is clear that, when the cross head moves in one
direction, one of the collars will strike the slotted arm L and carry it toward a
vertical position and past the centre of gravity. When past the centre, the weighted
arm on the same side the centre will quickly rock the slotted arm over, causing
its extremity to strike the opposite collar on the shifting bar and thereby throwing
the shifting bar accordingly, reversing the motion. Upon this taking place, the
shifting mechanism will operate in like manner in the opposite direction, and so
alternately reverse the motion.
The chucks D D' each consist of a head D having a reciprocatory movement
upon the shaft b', said head constructed with an annular peripheral groove d, and
with jaws D pivotally engaged within the head as shown at d' and projecting
forwardly therefrom. The shaft upon which the chuck is mounted is channelled
as shown at 7, 8, the channels being bevelled at their forward ends as shown in.
Figure 22, and provided with a point to project forward between the front end
of the jaws to force the bolt out of engagement therewith, the shaft at the rear
end of the point constructed with bevelled faces 60. The jaws are also formed
with bevelled faces toward their forward ends as at and with recesses having
an annular form at the rear as shown in Figures 19 and 22. As so constructed, it
it evident that, as the head D2 is reciprocated on the shaft, the jaws will be opened
at their forward extremity, as the head is retracted, to allow the bolt to drop there-
from, the rear of the jaws being forced downward into the channels 7, 68. A
contrary movement will correspondingly contract the forward ends of the jaws.
ready to engage the head of the bolt. At their forward ends, the jaws are preferably
constructed with their proximal faces of annular form arranged as shown in Figure 20
to engage the square head of the bolt when the chuck is moving, whatever may be
the shape in which the head is presented to said jaws. The angular faces of the
jaws are provided with oppositely extended angles d' ds, against the faces of which
the head of the bolt engages and is thereby prevented from turning in the operation
of threading. In this manner, the jaws need not clamp the bolt rigidly, but are
open in the movement of the head to allow the head of the bolt to drop upon the
said ledges and be held thereby. The head is held upon the shaft from turning
independently thereof by grooving the sides of the shaft and constructing the head
with ribs entering said grooves as shown at d. The jaws on their proximal faces
are angular or each provided with a flat portion which extends inwardly upon one
side, an inwardly curved surface on the other side and an inclined straight surface
which joins the inner ends of said outer surfaces, the flat portion of one surface
being diametrically opposite the curved surface of the other jaw, and the inclined
surfaces being substantially parallel with each other. This construction of the
jaws permits of the article to be held being introduced from either side as well as
from the front, and even though the chuck be rotating at the time. If the chuck
be rotating, as soon as the article is engaged by the curved surface of either jaw,
it.is forced inward to the inclined surface, where, in connection with the corre-
sponding surfaces of the opposite jaw, it is held tightly by moving the jaws toward
each other. In other words, the inclined and curved surfaces of the jaws really
make two substantially V-shaped recesses, one arm or surface of each of which
extends from the apex to the outer side of the jaw and the other arm or surface
terminates at a point intermediate the apex and the opposite side of the jaw.
The head D is reciprocated in the following manner :-
I, denotes a carriage having a reciprocatory engagement with the frame A..
The carriage is provided with an upwardly extended shoulder I formed with
lateral arms ii, constructed to engage the annular groove d of the chuck. I* is a
locking bar constructed with a bevelled face and shoulder i at its forward end
and pivoted to the frame, as at . The cross heads G G are provided with a
lifting lug g', so arranged that, when the head has moved sufficiently toward the
carriage, the lug lifts the locking bar. M' is a shaft engaged upon the carriage,
provided with a retracting spring M³ to thrust the carriage back to its normal

page_text: position when the locking mechanism is released. This shaft M' has a sliding
engagement in the adjacent cross head G', as in an orifice, Figure 4. Two
rods N N¹ engage the carriage and have a sliding engagement in a cross beam A
of the frame, as shown in Figures 5 and 6. These bars prevent the chuck being
carried too far in the direction of the work.
Thus far, the invention has been described as adapted for a screw-cutting machine,
it will be seen that the same is adapted equally well as a screw or bolt pointing
machine.
By removing the cutters K and K³ and introducing into the cutter heads K K'
straight edged cutters, a conical point can be cut on the screw or bolt, and this
modification and use of the machine are designed as coming within the scope of the
invention. O, Figure 1, denotes an oil tank provided with oil ducts Of to lead
the oil to the dies.
To allow the dies to cut well up to the head of the bolt, the jaws /' may be
removed, in which case it will be necessary to hold the bolt until the dies have a
firm engagement therewith; to do this, means are provided whereby the feeders
may retain a longer hold upon the bolt after the chuck has taken hold thereof.
Thus, for example, the gears B4 B' may be loosely mounted upon their respective
shafts, and said shafts be provided with discs R rigidly engaged upon the shaft
provided with an arın . The gears B B are provided with lugs » against which
said arms may engage. It will be seen that the gears, as represented in connection
with the gear B in Figure 5, may have a loose motion until the lug » engages the
arm, when the disc and its shaft will be rotated. This permits the feeders to
remain at the point of delivery while the gears B B are making the rotation to
engage the lug with the arm. By that time, the dies have a firm engagement
with the work. The cross heads G G and the chucks and related mechanism are
preferably arranged to operate alternately, at the two ends of the machine.
In operation, the bolts are fed into the shutes E' by an assistant, where they slide
down as shown in Figures 23 and 25. The feeding arms then swing up, and each
takes a bolt from its respective shute and carries it down and deposits it in its
respective chuck. The die heads then move forward and their cutters cut the
threads, after which they move back and the chucks open and let the bolts fall out.
In the meantime, the feeding arms have returned to the shutes, and each has
received another bolt which it carries to the chuck and deposits as before, and the
die heads again move forward and cut the threads. In this manner, the only manual
labour required is to feed the bolts to the shutes, as the machine does the rest of the
work automatically.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me
by my foreign correspondents, I declare that what I claim is :-
1. In a screw cutting and pointing machine, the combination of a rotary chuck for
holding the work, a feeding device to deliver the work to the chuck, reciprocating
die heads and cutters and mechanism to actuate the chuck and feeding device,
substantially as described.
2. In a screw cutting and pointing machine, the combination of a chuck for
holding the work, a feeding device, and a rotatable shaft. carrying the feeding
device provided with a stop, a second stop for engaging with said stop, said
feeding device having a limited movement on said shaft, substantially as
described.
3. In a screw cutting and pointing machine, the combination of a rotatable chuck
to hold the work provided with movable jaws, a feeding device to deliver the work
to said jaws, and driving mechanism to actuate said chuck and feeding device, sub-
stantially as described.
4. In a screw cutting and pointing machine, the combination of a chuck to hold
the work, a feeding shute and a feeding device to take the work from said shute and
deliver it to said chuck, substantially as described.

page_text: 5. In a screw cutting and pointing machine, the combination of a chuck to hold
the work, and movable dies and cutters for threading the body and point of the
work in a single operation, substantially as described.
6. In a screw cutting and pointing machine, the combination of a chuck to hold
the work, and longitudinal and lateral reciprocatory dics and cutters to thread the
body and point of the work, substantially as described.
7. In a screw cutting and pointing machine, the combination of a chuck to hold
the work and longitudinal and lateral reciprocatory cross head and a pair of dies and
cutters movable on said cross head, substantially as described.
8. In a screw cutting and pointing machine, the combination, with a supporting
frame, of a chuck to hold the work, a reciprocatory cross head, a pair of die
heads located upon said cross head, each provided with a die to cut the threads on
the body of the work, and a cutter to cut the threads on the point of the work,
substantially as described.
9. In a screw cutting and pointing machine, the combination of a chuck to hold
the work, feeding devices to deliver the work to the chuck, dies and cutters to thread
the body and the point of the work, and reversible driving mechanism, substantially
as described.
10. In a screw cutting and pointing machine, the combination of a chuck to
hold the work, a lock for said chuck, and threading mechanism to cut the
threads on the body and point of the work in one operation, substantially as
described.
11. In a screw cutting and pointing machine, the combination of a reciprocatory
rotatable chuck to hold the work, and feeding devices to deliver the work to the
chuck, substantially as described.
12. In a screw cutting and pointing machine, the combination of a reciprocatory
rotatable chuck, suitable die heads and cutters for engaging with the work, said chuck
provided with movable jaws, said jaws constructed with angular proximal faces and
means for operating the jaws and for delivering the work to the chuck, substantially
as described.
13. In a screw cutting and pointing machine, the combination of a rotatable
reciprocatory chuck to hold the work, a reciprocatory carriage engaging said chuck,
a locking device to hold the carriage while the work is being threaded, and a
releasing device, substantially as described.
14. In a screw cutting and pointing machine, the combination of a supporting
frame, a reciprocatory cross head, a dic head movable on said cross head,
and a guide plate to direct the movement of the die head, substantially as
described.
15. In a screw cutting and pointing machine, the combination of a supporting
frame, a chuck to hold the work, longitudinally and laterally reciprocatory dies
and cutters, locking devices to hold the dies and cutters to their work, and
releasing mechanism to permit the retraction of the dies and cutters, substantially
as described.
16. In a screw cutting and pointing machine, the combination of a chuck to hold
the work, longitudinally and laterally reciprocatory heads, dies and cutters engaged
with said heads, said cutters set at an angle to the dies to thread the point of the
work, substantially as described.
17. In a screw cutting and pointing machine, the combination, with a supporting
frame, of chucks to hold the work located thereupon, a pair of movable cross heads
each provided with dies and cutters to thread the body and point of the work in one
operation, feeding devices to deliver the work to said chucks, and feeding arms and
driving mechanism to actuate the chucks, cross heads and feeding devices, sub>-
stantially as described.
18. In a screw cutting and pointing machine, the combination, with a supporting
frame, of movable cross heads, movable dies, and cutters located thereupon, and
a guide plate to control the movement of the dies and cutters, substantially as
described.

page_text: 19. In a screw cutting and pointing machine, the combination, with a chuck,
of a feeding device to deliver the work to the chuck, a stop to limit the move-
ment of the feeding device, the reversible driving mechanism set forth to actuate the
chuck and feeding devices, and a clutch connected with the driving mechanism to
throw the feeding mechanism out of gear when its movement is limited until the
driving mechanism is reversed, substantially as described.
20. In a screw cutting and pointing machine, the combination, with a supporting
fraine, of cross heads movable thereupon and the adjusting mechanisin set forth to
control the movement of said cross heads, substantially as described.
21. In a screw cutting and pointing machine, the combination, with a supporting
frame, of movable cross heads having dies and yielding cutters located upon said
cross heads, substantially as described.
22. In a screw cutting and pointing machine, the combination of a chuck to
hold the work, a feeding device to deliver the work to the chuck, a feeding
shute to deliver the work to the feeding device, and the means set forth located
adjacent to said shute to bind the feeding device upon the work, substantially as
described.
23. In a chuck, the combination of a rotatable shaft, a reciprocatory head mounted
thereupon and rotatable therewith, and jaws interiorly fulcrummed within the head,
the shaft being adapted to engage with the jaws on both sides of the fulcrum,
whereby they will be closed upon the work when the head is reciprocated in one
direction and opened to release the work when reciprocated in the opposite direction.
substantially as described.
24. In a chuck, the combination of a rotatable shaft, a reciprocatory head
mounted thereupon and rotatable therewith, and jaws fulcrummed within the head,
said jaws each constructed with an interiorly bevelled face toward its forward end,
with an annular recess toward its rear end and with a heel at its rear extremity,
said shaft constructed with recesses to receive said heels, substantially as
described.
25. In a chuck, the combination, with a rotatable shaft, of a reciprocatory head
mounted thereupon and rotatable therewith, and two jaws fulcrummed on the
interior of said head, said jaws constructed with angular proximal faces at their
forward ends and each formed with a substantially V-shaped recess, one arm or
surface of which extends from the apex to the outer side of the jaw, and the other
arın or surface terminates at a point between the apex and the opposite side of the
jaw, substantially as described.
26. In a chuck, a rotatable head and jaws fulcrummed on said head and projecting
forward on the head, the forward and projecting ends of said jaws having their
proximal faces angular, or each provided with a flat portion which extends inwardly
from one side, and inwardly curved surface extending inwardly from the other side,
an inclined surface connecting the inner ends of the outer surfaces, the flat portion
of the jaw being diametrically opposite the curved surface of the other jaw, and
the inclined surfaces being substantially parallel with each other, substantially as
described.
Dated this 16th day of February 1899
WM. P. THOMPSON & Co.,
Agents for the Applicant.