IMPROVEMENTS IN SURFACE GRINDING MACHINES
Year: 1889

page_text: We, ELWIN RUFUS HYDE, Manufacturer, and RICHARD CHEW HORNER, Mechanical
Engineer, both of Springfield, Massachusetts, United States of America, do hereby
declare the nature of our invention for "IMPROVEMENTS IN SURFACE GRINDING
MACHINES," 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 surface grinding machines in which a revolving
grinding wheel or disk is mounted in suitable bearings projecting from or connected
with a bed or table for receiving and supporting the work to be surfaced, the essential
features of the present invention consisting in the means employed for securing a
reciprocatory movement of the grinding wheel transversely of said bed or table, in
addition to its revolving movement, and in certain details of construction presently to
be described.
In the accompanying drawings, illustrating the invention,
Figure 1 is a side elevation of the machine.
Figure 2 is a partial front elevation thereof, the lower portion of the supporting frame
being omitted.
Figure 3 is a plan view of the machine, shaft H and bevel gears hh kk, being omitted
to more clearly show the parts beneath them.
Figures 4, 5 and 6 are detail views of parts hereinafter referred to.
The machine herein illustrated as embodying the features of the invention, comprises
a bed A suitably supported upon legs B, said bed being provided with V-shaped ways
extending longitudinally thereof, in which a reciprocating table C is guided, said
table being operated by the engagement with a rack upon its under side of a gear
wheel b, mounted in suitable bearings of the bed, said wheel being driven through
intermediate gearing from the main shaft D, as is common in planer beds. Projecting
upwardly from bed A, at one end thereof, are the uprights E E, which are provided
upon their front side with vertical dove-tail ways dd, on which are guided slide-
blocks GG, having similarly shaped grooves in their rear sides to receive said ways.
Said slide-blocks G G are provided with the usual threaded nut or projection, indicated
by broken lines at g in Figure 1, which engage the vertical screw-shafts KK mounted
1 PS11

page_text: in bearings in the uprights, said screw-shafts being each provided, at its upper end,
with a bevel gear h, with which gears the bevel gears kk of a horizontal cross-shaft H
mesh, said cross-shaft being mounted in bearings in brackets projecting from the
uprights, as shown, and being provided at one end with a hand wheel or other means
for manually rotating the same. By rotating the cross-shaft, therefore, the slide-
blocks GG can be raised and lowered in unison.
Each of the slide-blocks G G is provided with a horizontal way 10 upon its front
face, upon which ways are movably mounted carrier-blocks 12 12, having therein
bearings for a shaft 13, which is free to revolve therein but is prevented from endwise
movement by collars 14 mounted upon said shaft at cach side of the blocks 12,
whereby also said carrier-blocks are caused to move in unison upon their horizontal
ways, upon motion being imparted to either of them.
The means for imparting a transverse reciprocatory movement to said carrier-blocks
and the shaft 13, consist of a pitman rod 15, connected at one end to one of the
blocks 12 and at its opposite end to an adjustable crank-pin 16 of a crank-plate 17,
mounted upon the lower end of an arbor 18, which is mounted in bearings in a
bracket-arm or extension 19 of one of the vertically movable slide-blocks G. The
arbor 18 also carries a gear 24, with which meshes a gear 25 on a vertical shaft 26,
which is mounted at its lower end in said bracket-arm 19, collars 27 on said shaft,
located respectively above and below said arm, compelling the shaft to partake of the
vertical movements of the slide-blocks G. The shaft 26 is provided with a longitudinal
spline-groove, and at the upper part of the machine it has bearing in the bifurcated
end-portion 28 of a bracket 29, between the members of which end-portion is confined
a worm-gear 32, through which the shaft 26 passes, a feather 33 projecting from said
gear within the spline-groove in said shaft, and forming a sliding connection between
the gear and shaft. A worm-shaft 35, mounted in bearings in brackets 36, at the
upper ends of the uprights E, carries at one end worm 34 which meshes with said
worm-gear 32, and carries, between its ends, a speed-pulley 37, by which motion is
transmitted thereto from a suitably disposed counter-shaft.
Between the carrier-blocks 12, said shaft 13 carries the grinding wheel or disk 20,
about which for the greater portion of its periphery and sides is disposed a hood 21,
which is supported by arms 22 from the carrier-blocks 12. At the front side of said
hood and extending transversely across it, is a pipe 40, provided through its wall
toward the grinding wheel with a series of perforations 41, see Figure 4, said pipe
being closed at one end, and having connected to its opposite end a flexible hose-
pipe 42, leading from a suitable pump and tanks, whereby water is forced into said
pipe 40 and, by the perforations therein, is uniformly distributed upon the face of the
grinding wheel.
With the article to be ground placed upon the reciprocating table C, and a
revolving movement being transmitted from any convenient source of power to worm-
shaft 35, said shaft through its worm connection with shaft 26 will revolve the latter,
and said shaft 26 will, through gears 24 25, transmit its movement to arbor 18
and crank-plate 17. By means of pitman-rod 15 the carrier-blocks 12 receive a
reciprocatory movement from said crank-plate, and transversely of the direction of
movement of tablo C. The grinding wheel is revolved by means of a band-pulley P
mounted upon shaft 13, and such compound movement of said wheel, combined with
the movement of the work itself with table C, secures a most effective, accurate and
speedy surfacing of said work. The water being conveyed to the face of the grinding
wheel and thence to the article being ground, serves to prevent any expansion of
said article whereby an inaccurate or uneven surfacing would result.
The gears 24 and 25 will preferably be enclosed within a suitable casing to protect
them from dirt.
The spline connection between shaft 26 and worm-gear 32 enables the slide-blocks G
and the parts carried thereby to be raised and lowered, by means of shafts H
and K K, without interrupting the driving connection from worm-shaft 35.
Provision is thus made for operating upon work of different heights, as well as for
lowering the grinding wheel as the surface of the work is reduced by grinding,

page_text: Provision is made for securing a longer or shorter reciprocation of the grinding
wheel, by making the crank-pin 16 of the crank-plate adjustable toward and away
from the center of said plate, and as shown in Figure 5, which is a vertical section
of said crank-plate, the latter is provided with a transverse groove within which is
5 fitted to slide a block 52, which carries the pin 16. A headed and collared scrow 53
passing through a shoulder 54 of the plate and within said groove in the latter
engages said block 52, whereby said block can be moved toward or away from the
center of the plate by turning said screw in the proper direction.
We prefer to employ as the bearings for shaft 13 split, tapered sleeves 60, see
Figure 6, which sleeves embrace said shaft, within the blocks 12, and are exteriorly
threaded at their smaller end to receive nuts 61, whereby said sleeves can be adjusted
to take up any lost motion between the sleeves and shaft caused by wear.
bearings of said shaft 13 can thus be continually kept in perfect alignment.
The two
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is:
1. In a surface grinding machine, the combination with a table and one or more
suitably supported horizontal guide-ways, of a support for a grinding wheel mounted
upon said guide-ways, a rotatable grinding wheel carried by said support, and means,
such as the crank-plate and pitman-rod herein shown, for imparting a reciprocatory
movement to said grinding wheel support, substantially as set forth.
2. In a surface grinding machine, the combination with a work support of a
rotatable grinding wheel mounted in bearings adjacent to said support, a hood partly
enclosing said wheel, and a pipe for conveying water to the periphery of said wheel,
substantially as described.
3. The combination with a bed, a longitudinally reciprocating table mounted
thereon, and suitably supported horizontal guide-ways, of a rotatable grinding wheel
mounted in hearings which are movably supported upon said guide-ways, a crank-
plate carrying a crank-pin, and a pitman-rod connecting said crank-pin with the
bearings of said wheel, substantially as described.
4. The combination with a bed, a longitudinally reciprocating table thereon, the
uprights having horizontal guide-ways thereon, a rotatable grinding wheel mounted
in bearings which slide upon said guide-ways, shaft 35 carrying worm 34, shaft 26
baving a worm-gear engaging said worm and gear 25, crank-plate 17 and gear 24
carried by shaft 18, said gear meshing with gear 25, and pitman-rod 15 connecting
said crank-plate with one of the bearings of said grinding wheel, substantially as
described.
5. The combination with a bed, a horizontally reciprocating table thereon,
uprights E E and screw shafts K K, of slide-blocks G G engaging said screw-shafts
and having horizontal guide-ways thereon, carrier-blocks 12 12 mounted upon said
ways and carrying a rotatable grinding wheel, shaft 35 carrying worm 34, shaft 26
having a spline groove therein and carrying gear 25, a worm-gear confined against
axial movement, said gear meshing with worm 34 and having a feather projecting
within the groove in said shaft 26, a bracket carried by one of said slide-blocks G in
which the lower end of said shaft 26 bears, shaft 18 having its bearing in said
bracket and carrying gear 24 and crank-plate 17, and pitman-rod 15 connecting
said crank-plate with one of said carrier-blocks 12, substantially as set forth.
6. In a surface grinding machine, the combination with the carrier-blocks 12 and
grinding wheel carried thereby, of a crank-plate carrying a radially adjustable
rank-pin, and a pitman-rod connecting said pin with one of said carrier-blocks,
ubstantially as set forth.
7. The crank-plate 17 having the groove therein as described and having shoulder 54,
lide-block 52 located in said groove and carrying pin 16, and screw 53 passing
hrough said shoulder and engaging said block, substantially as and for the purpose
escribed.

page_text: 8. The combination with carrier-blocks 12, of shaft 13 carrying a grinding wheel
and having its bearings in said blocks, tapered sleeves 60 surrounding said shaft
within said blocks, and nuts 61 for adjusting said sleeves longitudinally of said shaft,
substantially as and for the purpose described.
J.
ELWIN RUFUS HYDE.
RICHARD CHEW HORNER.
Haseltine, Lake & Co.,
45, Southampton Buildings, London,
Agent for the Applicant.