Improvements in Machines for Dressing and Resurfacing Valve Seats and Disks.
Year: 1896

page_text: Date of Application, 15th Sept., 1896-Accepted, 19th Dec., 1896
COMPLETE SPECIFICATION.
Improvements in Machines for Dressing and Resurfacing Valve
Seats and Disks.
I, ROYAL HENRY BENTON, Manufacturer, of 320 West 29th Street, New
York City in the County of New York and State of New York, United States
of America, do hereby declare the nature of my invention for Improvements
in Machines for Dressing and Resurfacing Valve Seats and Disks, 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 machines for dressing and resurfacing the seats and
disks of steam and water valves, faucets and the like, and has for its object the
provision of a machine of this class which will be simple and cheap of construction,
and yet capable of efficient and thoroughly satisfactory work; and to these ends,
the invention consists in the machine having the features of construction hereinafter
specified and claimed.
In the annexed drawings:
:-
Fig. 1 is a vertical section of my machine, applied to a valve for resurfacing the
seat thereof;
Fig. 2 is an end view of the machine as shown in Fig. 1, removed from the
valve;
Fig. 3 is a horizontal section on the line of Fig. 1 ;
Fig. 4 is a bottom view thereof;
Fig. 5 is a side view of the machine arranged for dressing a tapering valve
disk,
Fig. 6 a detail view of the disk or work holder shown in Fig. 5;
Fig. 7 a detail view of the disk cutting or dressing tool;
Fig. 8 a horizontal section on the line z-z of Fig. 5;
Figs. 9 and 10 are detail views of the seat cutting tool.
In the drawings A designates a straight, horizontal bar having at its longitudinal
centre a vertical opening through which passes and which journals a spindle B.
that at its lower end is threaded for connection with a cutting tool or a work
holder, and at its upper end is provided with a crank or handle C by means of
which it may be revolved. To afford an extended bearing for the spindle the
bar A has on its upper side an integral tubular extension a and on its lower side a
like, but shorter extension a¹.
The two sides of the bar A are inclined downwards and outwards, and
upon the same are placed two blocks D and D that are respectively on
opposite sides of the spindle B. Said blocks are slidingly connected with the
bar by means of a way in the upper side of each that has dovetailed or inclined
sides that engage the inclined sides of the bar.. Between one of the sides of each
block and the adjacent side of the bar I place a gib E, that may be adjusted by
means of screws e and e to prevent any looseness of the block whatever on
the bar.
Upon the underside of each block is a series of parallel, segment shaped
steps, F and F, preferably three, receding towards the spindle, and the curved
face of each being screw threaded in correspondence with the threads of valve
casings, which said steps are designed to engage. The inner sides of the blocks
below the bar extension a¹ are each provided with a semicircular cavity of the

page_text: same diameter as the spindle B, so that when the two blocks are brought
together the two cavities will enclose and afford a bearing for the spindle at such
point.
To simultaneously slide the two blocks along the bar A. and to give to both
exactly the same amount of movement, I employ a rod or shaft G placed parallel
with the bar and having right and left threaded portions H and H, that respectively
engage correspondingly threaded openings in the blocks. One or both ends of
the shaft are squared to receive a key or other device to revolve it, and to
prevent it moving endwise the shaft is provided at its longitudinal centre with a
circumferential groove g into which projects a lug or stud on the bar A. By
revolving the shaft in one direction the blocks will be simultaneously moved
towards each other, while by moving it in the reverse direction they will be
moved simultaneously away from each other.
For dressing valve seats, I employ a cutter in the form of a bar I that has a
central threaded opening i by which it may be attached to the lower end of the
spindle B, and has two, diametrically extending horizontal cutting edges, J and J
for operating on flat seats, and two inclined cutting edges, K and K, at its ends,
for work on inclined seate. The cutting edges J are arranged on tangential, not
radial lines to give a draw or sweeping cut, and the edges K are properly inclined
for a like reason.
Said cutting edges extend in straight lines and hence they
can be easily sharpened, and ample clearance may be given, so that no difficulty
from clogging arises even in cutting wet metal. By reversing the position of
the cutter bar on the spindle, one pair of cutting edges or the other may be put in
working position.
To feed the spindle B downward, I provide a feed yoke consisting of two disks L
and L that are connected by two vertical arms and 7 the upper disk having an
opening for the passage of the spindle and the lower disk an interiorly threaded
opening for engaging the externally threaded upper end of the bar extension a.
Between the disks there is a collar M on the spindle B that is adapted to be fixed
thereto by a set screw m, and which is engaged and moved downward by the upper
disk when the yoke is revolved to feed downward.
The use and operation of my machine for dressing valve seats, is as follows:-
A cutter I of suitable size is screwed on the lower end of the spindle B with the
appropriate cutting edges arranged for work according as the seat is flat or inclined,
and the lower end of the spindle and such portions of the blocks D and D inserted
in the valve as will go therein. The blocks are then moved by the screw-shaft to
place such steps thereof in engagement with the valve casing as nearest approach
in width the diameter of the casing opening. The cutter being on the valve seat,
the dressing is done simply by revolving the spindle, and, through the feed yoke,
feeding it downward as the cutting progresses, and by means of said yoke, applying
the requisite pressure to the cutter.
"It is to be noted that when a pair of steps engages a valve casing the under
sides of the steps next above rest on the top of the casing, thus insuring accurate
horizontal adjustment, since the underside of the steps lie in a plane at a perfect
right angle to the spindle, and consequently parallel to the cutting tool.
the topmost steps engage the interior of the casing, a function such as that just
described is performed by the underside of the blocks D.
When
Each succeeding pair of steps is wider laterally as well as longitudinally than
the one below it and the segment thereof is of a larger circle than the one below,
thus giving a wider surface for contact with the valve casing and giving a stronger
connection, proportionately, for larger valves.
By the described form of slide connection between the blocks D and the. bar A
any play of the parts by reason of looseness of the connections between the blocks
and bar can be absolutely avoided and the blocks and bar held relatively immovable
whatever be the position to which the blocks may be adjusted along the bar.
In Fig. 5 I show my machine arranged for dressing a tapered valve disk. The
latter is secured to a work holder that is screwed on the lower end of the spindle B

page_text: in place of the cutter I, said work holder has essentially the same general
construction as the valve casing clamping device, that is to say, it has a pair of
jaws D and D slidingly mounted on a bar A and adjustable by a right and left.
threaded shaft G, and each jaw has on its underside a curved projection threaded
interiorly and exteriorly, and adapted to engage the threaded projection on the
top of the disk.
The cutters for the disk are on the inner, opposite edges of a V-shaped bar N
that is supported by two vertical arms O and O extending from its upper ends,
that respectively pass through openings o and o near the en is of the bar A, and in
which they are secured by set screws P and P. Said cutters may be formed by
milling out the edges of the bar N, but preferably, I employ for each a blade
that is attached to the bar by means of screws q, that pass through slots in said
bar and thus permit of adjustment of the cutters.
It will be seen that the use of the bar N as a support for the cutters, or
blades Q is advantageous in that the latter by being located, as shown, on the sides
of said har, have their cutting edges presented on lines tangential and not radial
to the axis of the valve being ground. The result of this is that the cutting
edges do not catch or unduly bite into the valve and hence objectionable
chattering is avoided and a smooth, easy and free cut is produced. This arrange-
ment also renders. possible an ample range of adjustment of the angle of the cutter
to suit the inclination desired to be given the side of the valve.
My V-bar, besides being a very light and cheap forin of support for the cutters
is of advantage as exposing the work so that the operator can at all times see
exactly how much he is taking off the valve.
To dress or resurface a tapering valve disk with the machine arranged as just
described, the disk is removed from the valve stem and the work holder is attached
to that part of the disk which screws on the stem, by manipulating the screw shaft
until the jaws engage the sides of said part. The set screw of the spindle collar M
is now released which allows the spindle to which the work holder is attached, to
drop down until the disk rests upon the cutting edges of the dressing tool. Said
collar is then secured to the spindle at a point where it will be engaged by the
upper disk of the feed yoke, and the disk is dressed by revolving the spindle and
feeding the same downward precisely as with the dressing of the valve seat. As
the inner or cutting edges of the disk dressing tool are inclined to the same angle,
as the cutting edges of the inclined seat cutting tool it will be readily seen, that when
the two parts of the valve are again brought together after being operated upon,
they must of necessity form a perfect fitting.
By the employment of the V-shaped cutter it will be obvious that disks of
varying diameter may be dressed without any adjustment of the cutter, to com-
pensate for various diameters. Vertical adjustment of the cutter when necessary,.
is possible by moving the supporting rods up or down through the opening therefor
in the bar A, and the angles of the cutters may be changed by means of the set
screws and slots heretofore described. The wide range of vertical adjustment of
the V-bar renders unnecessary any vertical adjustment of the spindle, and the
obvious advantage of this is that the spindle can at all times, whether large or
Emall valves are being dressed, be kept with its lower part supported by the
bearings in the jaws. If, for instance small valves were being dressed, and the
vertical adjustment were obtained only by moving the spindle, it will be seen that
a large portion of the latter would be below the jaws, and hence unsupported.
With my vertically adjustable cutter bar, the vertical position of the spindle can
remain the same whatever the diameter of the valve being dressed. For holding:
or supporting the tool while dressing a disk, a rib or flange R is provided upon one
of the members of the V-bar N, which is adapted to be clamped in a vise.
When a disk is to be dressed, the blocks D and D are moved together so that
the semicircular cavities in the lower parts thereof, embrace and journal or
support the spindle at such point, and thus firmly hold the cutter from vibration or
chattering.
:

page_text: By employing but the two blocks or jaws D and D, I not only have a simpler
and cheaper machine than where a greater number, as four, is employed, but I am
enabled to employ the double thread feeding device, and the take-up or wear
compensating gibs.
It is to be understood, that while the particular specific features of construction
of my machine, as shown and described, are considered the most desirable, the
scope of my invention is not limited thereto, as changes in many respects can be
made which will not involve change of principle.
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
111.
1. In a valve dressing machine, the combination of the rotatable spindle, the
bar, the two clamping blocks slidingly mounted on the bar on opposite sides of the
spindle, and the shaft having right and left threaded portions that engage
correspondingly threaded openings in the blocks, substantially as specified.
2. In a valve dressing machine, the combination of the rotatable spindle, the
bar journalling the same, the two blocks slidingly mounted on the bar on opposite
sides of the spindle and having each valve engaging projections on its underside,
and the shaft having right and left threaded portions that respectively engage
correspondingly threaded openings in the blocks, substantially as specified.
3. In a valve dressing machine, the combination of the rotatable spindle, the
bar having inclined sides the two blocks slidingly mounted on the bar having
inclined portions to engage the sides of the bar, the adjustable gib between each
block and the bar side, and the shaft having right and left threaded portions to
engage, respectively, correspondingly threaded openings in the blocks, substantially
as specified.
4. In a valve dressing machine, the combination of the rotatable spindle, the
bar through which the same passes having a tubular extension, the spindle
feeding yoke comprising connected upper and lower disks the lower disk having a
threaded opening to engage the threaded upper end of the said extension, a collar
on the spindle beneath the upper disk, and the clamping blocks adjustably mounted
on the bar, substantially as described.
5. In a valve dressing machine, the combination of the rotatable spindle, the bar
through which the same passes having tubular extensions above and below, the
two blocks on the bar having valve engaging projections on their under sides and
having each on its inner face a cavity to engage and journal the spindle, the
double threaded shaft for moving the blocks along the bar, and the adjustable gib
between each block and the bar side, substantially as described.
6. In a valve dressing machine the combination of the rotatable spindle the bar
through which the same passes having tubular extensions above and below, the
two blocks having each valve engaging projections on its underside and having
each on its inner face a cavity adapted to engage and journal the spindle, and
means for sliding the blocks on the bar, substantially as specified.
7. In a valve dressing machine, the combination of the clamping device, the
rotatable spindle, and the cutting tool on the end of the latter, composed of a bar
having cutting portions that consist of straight edges on diametrically opposite
sides of the spindle, substantially as specified.
8. In a valve dressing machine the combination of the clamping device, the
rotatable spindle, and the cutting tool on the end of the latter composed of a
reversible bar having two pairs of straight cutting edges, one pair being horizontal
and the other inclined, substantially as specified.
9. In a valve dressing machine, the combination of the clamping device, the
rotatable spindle, a work holder detachably mounted on the spindle, and a disk
dressing appliance consisting of an open V-shaped frame having a cutter or
cutters whose cutting edges engage the disk on lines tangential and not radial to
the disk axis, substantially as specified.

page_text: 10. In a valve dressing machine, the combination of a clamping device, the
rotatable spindle, a work holder on the spindle, the bar with inclined cutters on
its sides extending in lines tangential to the spindle axis, and the parallel
vertical extensions of said bar adapted for vertical adjustment, substantially as
specified.
11. In a valve dressing machine, the combination of the clamping device, the
rotatable and vertically movable spindle, a work holder detachably mounted on
the lower end of the spindle, a disk dressing appliance, comprising a V-shaped bar
having on its inner sides oppositely facing cutting edges, and detachably connected
to the clamping device, substantially as specified.
12. In a valve dressing machine, the combination of the bar, the clamping
blocks thereon, the rotatable and vertically movable spindle passing through the
bar, a work holder on the lower end of the spindle, and a disk dressing appliance
comprising a bar bent to V shape, and having vertical arms entering openings in
the bar of the clamping blocks, set screws on the latter to engage said arms, and
cutters on the inner sides of the V, substantially as specified.
13. In a valve dressing machine, the combination of the bar, the clamping
blocks thereon, a rotatable and vertically movable spindle, a work holder on the
lower end of the spindle, and a disk dressing appliance, consisting of a bar bent
to V form and having its extremities attached to the bar of the clamping blocks,.
and having on the inner edges of the V two longitudinally extending cutters
detachably and adjustably secured to opposite sides of the V by sct screws,.
substantially as specified.
Dated this Sixth day of August 1896.
ROYAL H. BENTON.
Boult & Wade,
Agents for the Applicant.