Improvements in Machines for Repairing Valves and Valve-seats.
Year: 1896

page_text: Date of Application, 19th May, 1896-Accepted, 20th June, 1896
COMPLETE SPECIFICATION.
Improvements in Machines for Repairing Valves and Valve-seats.
I, FRANK EDWARD DEXTER, of the Athol Hotel, in the Town of Athol, in
the County of Worcester, and State of Massachusetts, United States of America,
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 invention relates to portable devices for repairing globe and similar valves,
the object being to provide an improved device of this class for repairing the
valve-seats and the valves thereof; and the invention consists in the peculiar
construction and arrangement of the several parts thereof, all as hereinafter fully
described and more particularly pointed out in the claims.
In the drawings forming part of this Specification,-
Figure 1 is a plan view, partly in section, of a valve repairing device constructed
according to my invention."
Figure 2 is a sectional view on line 2-2, Figure 1.
Figure 3 is a bottom plan view of the device, this figure showing a vise in
which the machine is held for operation.
Figure 4 is a perspective view of a portion of the device to be hereinafter
described.
Figure 5 is a side elevation and a sectional view, showing a valve-body attached
to the machine.
Figure 6 is a perspective view of a portion of the spindle of the machine and a
cutter-holder and cutters attached thereto.
In the drawings, A indicates a circular table, and B, a series of curved,
converging arms integral with, or firmly secured to, said table. C, is a screw-
threaded hub integral with the upper extremities of said arms B. D, is a sleeve
screwing into said hub C, and having a perforated border thereon, as shown,
whereby the said sleeve may be turned in the hub C, by the insertion of pins in
said perforations whereby the sleeve D, is adjusted to different longitudinal positions
in said hub. I, is the main shaft of the machine, said shaft extending through
said sleeve D, and through the said table A, as shown. The said shaft I, has a
longitudinal spline-groove 2, formed therein in which is fitted a spline 3.
A collar H, surrounds the shaft I, and the upper extremity of said spline 3, as
shown, and a screw 4, through said collar, secures the latter on the shaft, said collar
constituting an abutment for the adjoining end of said sleeve D.
A second collar J, is secured around said shaft and spline in a similar manner to
said last-named collar, below the said sleeve D, and a friction washer 5, is
placed on said shaft, between said collar J, and the adjoining end of said sleeve.
A friction shoe E, is placed in a recess in the inner wall of said hub C, for
frictional engagement with the screw-threaded surface of the sleeve D, by means
of a set-screw F, acting against said shoe. The purpose of said shoe and its
pressure against the sleeve D, being to hold the latter from rotary movement while
shaft, is being rotated, as below described.
The said sleeve D, by its engagement between the collars H and J, which are
secured on shaft I, serves as a means of adjusting said shaft to different longitudinal
positions and for feeding the same and a tool, or tools, connected with it, for the
purposes hereinafter set forth, which adjustment is operated by turning said sleeve,
as aforesaid, in said hub C.
A beveled gear K, has a spline connection with said shaft I, as shown in

page_text: Figure 1, whereby the said shaft may have a sliding motion through the hub of
said gear while the latter operates to rotate the shaft.
A crank-shaft L, has a bearing in one of said arms B, as shown, on one end of
which shaft is a beveled pinion M, engaging with said gear K. A crank N, is
attached to said shaft L, whereby, by the rotation of the shaft L, the said gear K,
and the shaft I, are given a rotary motion.
A suitable chuck P, is bolted, or otherwise suitably attached, (see Figure 1,) to
the underside of said table A, which chuck is provided with radial moving jaws R,
having projecting parts thereon for holding parts of the machine, or articles to be
operated upon by it.
The said table A, has a sleeve G, projecting from the underside thereof through
which the said shaft I, extends. Said sleeve D, serves to steady the said shaft
within it, while a cutter or cutters are being operated thereby, and prevent any
chattering movement of said shaft or cutters.
In Figure 1, a chuck V, of a similar construction to the chuck P, above.
described, is attached to the extremity of the shaft I, and said chuck is shown in
engagement with the spindle-socket in the hub of a valve 12, by its jaws 13.
For repairing objects similar to the said valve 12, the tool-supporting ring T, is
provided, which is attached to the machine by means of the said chuck P', the jaws
of which engage with the borders of the central opening in said ring T, as shown
in Figure 1.
The said ring T, is adapted to have a tool support W, bolted to the side thereof
and to have a bracket Y, secured in like manner to an opposite side. The bolts 21,
serve to secure the said parts W and Y, to said ring, said support or bracket Y,
having a slot therein through which said bolt 21, passes, whereby the same is
made adjustable on said ring, according to the description of the object that the
center-screw Z, in said bracket, must engage with.
The said tool-support W, is constructed as shown in Figure 3, whereby a tool-
holder X, is clamped thereto by means of a clamping-bolt 22. The said tool-
holder X, is of tubular form and contains therein a tool-carrier 7, which is moved
longitudinally in the holder by a screw 10, having the hand-wheel thereon.
A tool 8, is secured in said carrier 7, by a set-screw 9, in the lower extremity of
said carrier, said tool projecting through a slot in the side of the holder X, to the
end that while an object is being rotated opposite said tool, the latter may be
moved along the face thereof for cutting and dressing the same.
The said centering screw Z, in the end of the bracket Y, serves, together with
the shaft 1, to support an object such as said valve 12, rigidly, while it is being
rotated for the purpose of being operated upon by said tool 8.
In employing the within described machine to operate in the formation of a
concave or a flat-faced valve-seat, the said chuck V, in Figure 1, is moved from
the end of shaft I, and the tool-holder 14, Figure 5, is substituted therefor, as shown
in Figure 5. Said last-nained tool-holder is adapted to be screwed or otherwise
secured to the extremity of shaft I, as shown, and has on its under side suitable
recesses for the reception of cutting tools 15, which tools are secured on said
holder, each by a bolt 16, as shown.
The tools which are required for different surfaces with this machine and which
are secured to the holder, are obviously formed for the particular uses for which
they are designed.
The within described machine, when used for dressing a part of the surface of a
valve 12, as shown in Figure 1, is preferably supported by a vise 20, Figure 3,
which grasps a projection 19, on said ring T, and when so held the position which
the machine occupies most conveniently is a horizontal one, substantially as
represented in Figure 1.
The operation of the above described machine in dressing the bearing surfaces of
valves, one of which valves 12, is shown in Figure 1, is as follows:-
The chuck V, is attached to the end of the shaft I, as shown in said figure, and
the jaws of said chuck are caused to approach the center thereof closely enough

page_text: to permit of entering them within the spindle-socket in said valve, after which
the chuck is operated to expand the jaws of the chuck, whereby the said valve
becomes engaged thereby so that the valve may be rotated when the shaft is given
a rotary motion.
The center-screw Z, supported on the bracket Y, is turned up to engagement
with the center of said valve. The tool 8, is then adjusted through the tool-
support W, and the screw 10, to proper position to operate on said valve.
The shaft I, having already been properly adjusted longitudinally, by the
sleeve D, and being so held in position by the collars H and J, the crank N, is
then operated through the pinion and gear M and K, whereby rotary motion is
imparted to the valve 12, and during said rotary motion the tool 8, is caused to
move across the face of the bearing portion of the valve 12, which is to be dressed,
by turning said screw-rod 10, by means of the hand-wheel on the outer end
thereof.
Said valve having been properly dressed, as described, it is freed from the
machine so that it may be taken therefrom by operating chuck V, to move its jaws
centrally thereon and by unscrewing the screw Z, thereunder.
In operating the device for dressing the seat 18, of the valve-body 17, illustrated
in Figure 5, the said tool-holder 14, having the proper tools thereon, is attached to
the lower extremity of the shaft I.
Said .shaft is then adjusted longitudinally to carry the cutters 18, against the
surface of said valve-seat, as shown. The said adjustment of the cutters against
the valve-seat is effected by freeing the friction-shoe E, from its pressure against
the sleeve D, and then screwing down said sleeve against the collar J, which is
tightly attached to the shaft, thus adjusting the cutters, as aforesaid.
Then by turning the crank N, and shaft I, the cutters are rotated, and from time
to time, until the seat shall have attained a proper finish, the sleeve D, is turned
slightly to carry the tool more and more against the work. Should the work offer
a good deal of resistance to the action of the cutter, the sleeve D, is prevented
from so rotating in the hub C, by the upward pressure of collar J,'against its lower
end, by forcing said shoe E, against the sleeve D, and there holding it by the
screw F, each time that the shaft is adjusted to position to secure a proper operation
of the cutters upon the work.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a machine for repairing valves and valve-seats, a table having converging
arms secured to and extending from one side thereof, an internally screw-threaded
hub fixed between the extremities of said arms, and a centrally located sleeve
extending from one side of said table in a direction opposite to that of said arms,
combined with a longitudinally adjustable sleeve D, screwing into said hub, a tool
and work-carrying shaft having a spline-groove therein extending through said
sleeve, a collar adjustably secured on said shaft at each end of said sleeve D, a
spline engaging said spline-groove and said adjustable collars, and means for rotating
said shaft, substantially as described.
2. In a machine for repairing valves and valve-seats, a table having converging
arms extending from one side thereof, an internally screw-threaded hub fixed
between the extremities of said arms, and a centrally located sleeve extending
from one side of said table in a direction opposite to that of said arms, combined
with a longitudinally adjustable sleeve D, screwing into said hub, a tool-carrying
shaft extending through said two sleeves having a spline-groove therein, a collar
adjustably secured on said shaft at each end of said sleeve D, a spline engaging
said spline-groove and said adjustable collars, a device-supporting ring connected
to said table, a turning tool secured to said ring, and means for imparting a rotary
motion to said shaft, and for moving said tool against its work, substantially as set
forth.

page_text: 3. In a machine for repairing valves and valve-seats, a table having converging
arms extending from one side thereof, an internally screw-threaded hub fixed
between the extremities of said arms, combined with a longitudinally adjustable
sleeve D, screwing into said hub, a friction shoe in the inner wall of said hub, and
means for forcing said shoe against said sleeve, a tool-carrying shaft having a
spline-groove therein extending through said sleeve, a collar adjustably secured
on said shaft at each end of said sleeve D, a spline engaging said spline-groove
and said adjustable collars, and means for rotating said shaft, substantially as
.described.
4. In a machine for repairing valves and valve-seats, a table having converging
arms extending from one side thereof, an internally screw-threaded hub fixed
between the extremities of said arms, and a centrally located sleeve extending from
one side of said table in a direction opposite to that of said arms, combined with a
chuck having radially moving jaws secured under said table, a longitudinally
adjustable sleeve D, screwing into said hub, a tool-carrying shaft having a spline-
groove therein extending through said two sleeves, a collar adjustably secured on
said shaft at each end of said sleeve D, a spline engaging said spline-groove and
said adjustable collars, a device-supporting ring T, engaged by the jaws of said
chuck, the center-supporting bracket Y, attached to said ring having thereon the
center-screw Z, a chuck having radially moving jaws attached to the extremity of
said shaft in proximity to said ring, a turning tool secured to said ring, and means
for imparting a rotary motion to said shaft, substantially as set forth.
5. In a machine for repairing valves and valve-seats, a table having converging
arms extending from the sides thereof, an internally screw-threaded hub fixed
between the extremities of said arms, and the sleeve G, fixed to and extending at
right angles to the side thereof, combined with a longitudinally adjustable sleeve D,
screwing into said hub, a friction shoe in the inner wall of said hub, and means for
forcing said shoe against said sleeve, a tool-carrying shaft having a spline-groove
therein extending through said sleeves, a collar adjustably secured on said shaft at
each end of said sleeve D, a spline engaging said spline-groove and said adjustable
collars, means for rotating said shaft and a tool-holder 14, carried thereby, having
cutting tools secured thereon, substantially as described.
6. In a machine for repairing valves and valve-seats, a table A, having con-
verging arms B, and a centrally located sleeve G, thereon, combined with a
rotatable shaft I, having its bearings between the converging ends of sail arms
and within said sleeve, a chuck P, secured to said table, a device-supporting
ring T, engaged by said chuck, a support W, adjustably attached to said ring T,
a tool-case X, adjustably attached to said support W, a tool-carrier within said
case X, and a tool carried thereby, and means for adjusting said tool-carrier in its
support W, and moving said tool independently of said carrier, and for rotating
said shaft I, substantially as set forth.
7. The ring T, the tool-support W, attached thereto, the tool-case X, held by,
and longitudinally adjustable in said support, the tool 8, a movable carrier in said
case to which said tool is secured, and means for moving said carrier within its
case, combined with the shaft I, supported to rotate within said ring, a work-
holding chuck V, carried on said shaft, and means for rotating said shaft,
substantially as set forth.
Dated this 24th day of April 1896.
FRANK E. DEXTER.
Haseltine, Lake & Co.,
45 Southampton Buildings, W.C., Agents for the Applicant.