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Патент USA US2114454

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April 19, 1938.
Filed Oct. 28, 1935
4 Sheets-Sheet l
April 19, 1938.
Filed Oct. 28, 1935
4 Sheets-Sheet 2
. ‘
April 19, 1938.
Filed Oct. 28, 1935
4 Sheets-Sheet 3
April 19, 1938.
Filed Oct. 28, 1935
4 Sheets-Sheet 4
BY yd‘
Patented Apr. 19, 1938
Henry J. Perazzoli, Philadelphia, Pa.
Application October 28, 1935, Serial No. 46,992
4 Claims.» (Cl. 51-—178)
This invention relates to a novel grinding ma
chine. certain features of which are especially
suitable for use in a readily portable grinding
chine incorporating the features of this inven
machine particularly adapted to grind rails of
Figure 2 is an enlarged horizontal sectional
view taken substantially as indicated by the sec
a railroad or street car trackway.
tion line 2—2 on Figure 1;
One of the principal objects of the invention
is the provision of a machine or unit adapted
to receive power from a flexible driving shaft,
the latter being driven by any suitable motor
10 which, in the case of a portable machine, is han
dleable as a separate unit. For this purpose the
invention provides a readily separable drive con
nection adapted to cooperate with the ?exible
Another object of the invention is the provision
of a simple machine of this character, having
relatively few parts, the whole being arranged
Figure 3 is a further enlarged transverse sec
tional view taken as indicated by the section
line 3—3 on Figure 1;
Figure 4 is a side view of certain of the mem
bers employed, including abrasive blocks of some
what modi?ed construction as compared with the
arrangement shown in Figures 1 to 3 inclusive;
Figures 5 and 6 are top and sectional views, in
modi?ed form, of an abrasive device and its
and 6, but showing another modi?cation; and
in a manner to provide novel weight distribution
and balance. An important point in this con
nection is that the weight of the machine is so
distributed with reference to the abrasive mate
rial or blocks employed that the unit has certain
inherent stability or balance and need not, there
Figures 9 and 10 are also views similar to Fig
ures 5 and 6 illustrating a still further embodi
fore, be provided with means for supporting it in
upright position such as a laterally extending
being extended lengthwise of the machine and
being secured to the upper ends of uprights ii
arm carrying a roller adapted to ride on another
rail, as has been adopted in certain prior ma
In addition to the foregoing the invention pro
on which rollers l3 are mounted and adapted to
30 vides a compact arrangement of driving parts,
including reduction gearing between the means
for coupling the machine with the flexible drive
shaft and the abrasive elements.
According to another aspect of the invention,
35 a simple and yet effective abrasive carrier and
The general features of the mechanism, as will
best be seen from inspection of Figure 1, include
frame members, such as angle irons H, these
ride on'a rail 14 to be ground. U-shaped han
dles, portions of which are illustrated at Ha,
may conveniently be fastened to the framing il
toward opposite ends thereof.
An additional frame including angles 15 and
end pieces [6 serves to carry the working parts
of the machine by means of supports 11. The
frame members It are positioned adjacent to the
uprights l 2 and are provided with apertured pro 35
supporting mechanism is employed, this being
jections l8 extending through vertically elon
arranged so as to reduce the number of parts to
a minimum and also to accomplish a number of
other purposes which will appear more fully here
40 inafter.
gated slots is formed in the uprights l2. Rel
ative vertical movement of the framing com
prising members l5, Hi and H, with respect to
the main frame elements H and supports. I2, is
Another object of the invention is involved in
provided for by means of a threaded collar 26 at
the provision of a convenient mechanism for re
placing worn-out grinding elements, such as
_ bricks or blocks.
The invention also contemplates certain fea
tures of improvement in the mounting of the
abrasive elements and in the construction of
these elements or devices.
How the foregoing, together with other ob
jects and advantages, are secured, will appear
more fully from a consideration of the following
description making reference to the accompany
ing drawings, in which
Figure l is a side elevational view, with cer
" tain parts in vertical section, of a grinding ma
Figures '7 and 8 are views similar to Figures 5
each end of the unit, which collars are keyed
in the brackets I8 and receive the adjusting
screws 2!. Springs 20a are interposed between
the brackets l8 and the heads of the collars 20 45
so as to provide resilience in the pressure of the
grinding elements on the rail. The screws 2| are
journalled in members 22 wihch are carried by
the angles H and a worm wheel 23 is mounted
at the upper end of each screw 2! in position to 50
cooperate with a worm 24 mounted on shaft 25.
This shaft extends throughout the length of the
machine and is provided with a hand wheel 26
at one end thereof whereby adjustment of both
worms and worm wheels, and therefore of both 55
screws 2!, is effected simultaneously. Springs
28a are of especial advantage in preventing rais»
ing of the entire machine when a high spot on
the rail is encountered by the grinding elements.
The grinding portion of the mechanism is car
ried between the pairs of supporting plates IT at
each end of the machine and includes (see Fig
ure 2) side plates 27 and 28. These plates serve
to partially enclose and completely support all of
10 the operative parts for carrying and driving the
grinding elements.
As best seen in Figure 2, a transverse shaft
29, journalled by bearings 3ll—30, is mounted in
the frame plates ill and 28, one end of this shaft
15 being provided with a key arrangement 3! adapt
ed for ready connection and disconnection with a
?exible power shaft. The non-rotatable sleeve
32 surrounding this end of shaft 29 is threaded
as at 33 to cooperate with the sheath of the ?ex
20 ible drive shaft.
Gears 34 and 35 serve to couple shaft 29 with
an additional shaft 36 also carried by the frame
members 27 and 28, and in turn coupled by means
of gears 31, 38 and 39 with shaft 45, gear 38 be
ing an idler suitably mounted on the pin 41.
Shaft 40 takes the form of a sleeve mounted
on bearings 42-61 which in turn are supported
by the ?xed spindle 43. The cylindrical shaft 453
further carn'es a sprocket 44, this being a coun~
30 terpart of another similar sprocket 45 which is
by brackets 64 which are secured to the guides
65 so that upon adjustment, both guides move
With reference to Figure 1 it will further be
seen that the working edge of guides 60 are
tapered or inclined at their ends as at 65, this
being of importance in order to provide a gradual
change in the angular position of the abrasive de
vices during the time they are moving from a
curved run around the sprocket intov a straight 10
run between the sprockets, or vice versa. It will
also be noted that these guides thus provide for
movement of the abrasive elements in straight
runs between the sprockets which are slightly
out of tangency with respect to the sprockets.
Guide members 6|, however, are desirably
formed with straight working edges so as to ac
commodate the cocking or angling of the guide
extensions 59 of the carrier plates 56 as the
abrasive devices are moving from a curved run 20
into a straight run and vice versa.
By virtue of the foregoing guide construction
I have found that the abrasive elements are ef
fectively retained in a path of movement provid
ing a “planer” action on the rail in addition to 25
the rotary grinder action occurring at the points
where the abrasive elements move into and out
of a straight run. I have further found that
these guides materially reduce vibration and sub
stantially eliminate whipping during operation.
mounted toward the other end of the frame plates
21 and 28 on an additional cylindrical shaft 46
that the con?guration of the guides and the posi
which is constructed and arranged in a manner
tioning of the several parts are all such as to
essentially similar to that described in connec
tion with shaft 40. Shaft 45, however, is car
ried by blocks 4‘! (see Figures 1 and 2) adapted
to slide in slots 48 so as to provide freedom of
movement of the two sprockets (44 and 45) to
ward" and away from each other. Adjusting
40 screws 49 taking into threaded lugs 50 provide for
adjustment of the position of the blocks 41 in
slots 48.
The adjustment mechanism described just
above serves to take up slack in the chain carrier
for the abrasive elements, now to be described,
which chain surrounds the sprockets 44 and 45
and is driven by sprocket 44 of the drive mecha
nism already described.
provide access to the securing bolts 58 serving to
attach the abrasive elements to the carrier plates . ~
56. Replacements are thus facilitated.
Turning now io the construction of the abrasive
devices themselves, reference is made ?rst to the
arrangement shown in Figures 1, 2 and 3. In
this construction a plate 55 is provided, the same 40
having a pair of apertures into which the abrasive
material 61 is molded to provide dovetail inter
locks as shown at 68. It will be noted that the
abrasive block is elongate-d transversely of the
rail to be ground, the effective surface preferably 45
being slightly concave as at 59 to correspond with
the surface desired. The plate 66 further has
undercut projections 15 at the longer edges of
By reference to Figures 1 to 4 inclusive it will
50 be seen that the chain consists of pairs of alter
nate inside and outside links 5! and 52 coupled
by pintles 53. Each pair of links 5l—5l and
52——52 serves to carry an abrasive device, and for
this purpose it is provided with laterally project~
ing brackets 54 and 55, respectively (see particu
larly Figures 3 and 4). Each pair of brackets
54-54 and 55—55 carries a supporting plate 55,
suitable fastening screws 51 being provided for
this purpose.
By reference to Figure 1 it will further be seen
An abrasive device is in turn se
cured to the carrier plate 56 by means of studs
the block so as to provide a further interlock ‘N.
This latter interlock appears to best advantage 50
in Figure 4, which illustrates the same construc
tion as Figures 1 to 3 inclusive except that the
blocks 6? are formed of such width as to leave
spaces 72 between adjacent blocks for clearance
of grindings and the like. It will be noted, how
ever, that the plates 66 in the arrangement of Fig
ure 4 as well as of Figures 1 to 3 inclusive are of
such width as to abut each other in the straight
run of the chain between the sprockets, this being
of importance in maintaining rigidity during the 60
58, these being readily removable to provide for
grinding operation.
convenient replacement of worn grinding ele
In addition to serving as a means for carrying
with the abrasive block may take the form shown
in Figures 5 and 6. In this case the plate or
65 the abrasive devices, the plates 56 further serve
a guiding function, and for this purpose are pro
vided with extensions 59 at their outside ends
which ?t and slide between cooperating guides
or gibs 60 and BI. The guides 60 are provided
with recesses or slots 62 (see Figure 1) through
which fastening studs 63 ‘extend and take into the
side of the frame plates 21 and 28. By this
means the guides may be adjusted with refer
ence to the straight runs of the chain between the
75 two sprockets. Guide members 6! are supported
Alternatively, the bracket member associated
bracket 73 is provided with central apertures 14
similarly to the arrangement of Figures 1 to 4 in
clusive, the edges of these apertures being under
cut to provide an interlock when the abrasive is
molded. As best seen in Figure 6, however, this
form of grinding unit contemplates the provision
of undercut projections 15 along the ends of the
block instead of along the side edges thereof.
Still further, and as seen in Figures 7 and 8,
the abrasive block may, if desired, ?rst be molded
independently of any carrier plate. Such a block
appears at 76 and has a keystone head ‘H of
such size as to pass the bevelled edges 18 formed
around the large central aperture 19 in the car
rier member 853. After molding a block in the
shape already speci?ed, the block and the car
rier plate 3% are brought together and some mold
able material, such as lead, sulphur or the like
8|, is poured into the space surrounding the key
stone head ll in order to rigidly secure the block
10 76 to the plate 80.
The abrasive device of Figures 9 and 10 pro
vides a somewhat different and highly effective
means for keying the block to the supporting
plate. In this arrangement the abrasive material
82 is molded with a portion thereof projecting into
the large opening 83 in the plate 84, the plate
central carrier chain and sprockets, abrasive
blocks centralized with reference to the chain
and sprockets, and guides positioned in planes to
each side of the path of movement of the blocks.
I claim:-—
1. Apparatus of the character described includ
ing in combination with a plurality of abrasive
devices, a chain, links of which are. provided with
laterally projecting brackets, carrier plates ex
tended transversely of the chain and secured to 10
said brackets, means for securing said devices to
the carrier plates, and guide devices cooperating
with the carrier plates adjacent the lateral edges
thereof to ensure movement of the abrasive de
vices in a predetermined path.
2. A grinding machine including an endless
further being provided with transverse pins 85
carrier, means for supporting and driving the‘
which, of course, are embedded in the material
same, abrasive means mounted on the carrier,
during molding.
From the foregoing it will be seen that this
invention provides an unusually simpli?ed grind
ing machine or unit which may readily be trans
guide ?anges projecting laterally from the car
rier, and cooperating grooved guides adapted to
ported. In this connection, however, it is to be
engage said guide ?anges at both sides thereof and
provide for travel of the abrasive means and car
rier in a predetermined path, the guide ?anges
understood that numerous advantages of many
features of the invention, especially of the car
and grooved guides having interengagement pro
viding against cocking of the former during move
rier arrangement of the grinding elements, may
- also‘ be secured without utilizing the framing and
support structure herein illustrated.
It is further pointed out that by virtue of the
arrangement of the various parts described, the
center of gravity of the grinding unit per se (ex
cluzhng the frames) lies substantially in a ver
tical plane containing the rail to be ground.
This is of importance regardless of whether the
grinding unit is mounted in some. other frame
(such as a truck or car), or in framing of the
character herein illustrated. In the embodiment
shown in Figure 1, however, the framing for sup
porting the grinding unit is also arranged so
40 that its center of gravity lies substantially in a
vertical plane containing the rail to be ground,
and the weight distribution of the grinding unit
and of the framing in this way is of especial ad
vantage in a readily transportable unit as herein
contemplated. In operation, the machine may
readily be kept in upright position and the weight
thereof may all be utilized in securing the de
sired contact of the abrasive blocks and the rail.
Another important feature of the construction
is involved in the arrangement of parts which
appears most clearly in Figure 3, i. e., with a
ment in said path.
3. A rail grinding machine including means
for sup-porting the machine on a rail to be ground,
a pair of frame members disposed at opposite
sides of a vertical plane containing the rail axis, 30
a pair of spaced rotative devices mounted in the
frame members, an endless carrier chain riding
on said rotative devices, the chain and the rota
tive devices being located substantially in said
vertical plane, abrasive blocks carried by said 35
chain, for each block laterally projecting guide
?anges, and cooperating grooved guides project
ing from the frame members to engage the guide
4. A rail grinding machine including a frame, 40
Wheel means for supporting the frame on the rail
to be ground and providing for movement of the
machine along the rail, .an endless carrier with
support devices therefor mounted in the frame,
abrasive blocks secured to the carrier, flat plate
like guide devices projecting laterally at opposite
sides of the carrier, and grooved guides for re
ceiving said guide devices, the grooved guides be
ing carried by said frame.
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