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Патент USA US2404917

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July 30, 1946.
E. c. MURDOCK
2,404,917
ABRADING MACHINE
Filed July 2'7, l\945
4 Sheets-Sheet l
July 30, 1946.
2,404,917
a c. ‘MURDOCK
ABRADING MACHINE
Filed July 27, 1945
4 Sheets-Sheet 2_
“mgm ;
July 30, 1946.
2,404,91 7
E. c. MURDOCK
I ABRADING MACHINE
Filed July 27, 1945
4 Sheets—Sheet 3
/
4/
m”6/
64
6:3
July 30, 1946.
E. c. MURDOCK
ABRADING MACHINE
Filed July 27, 1945
viQ.v|a
4 Sheets_sheet 4
Patented July 30,1946
2,404,917
‘UNITED STATES PATENT OFFICE
2,404,917 _
ABRADING MACHINE
Elmer Conda Murdock, Statesville, N. C.
Application July 27, 1945, Serial No. 607,392
4 Claims. (Cl. 51-140)
1
2
This invention relates to a machine for abrad
ing or sanding or polishing objects such as the
backs and seat slats of a wooden chair. These
seat slats are usually not only curved but some
times provided with reverse curves and it is quite
a manual operation to hold these pieces of wood
against an abrading wheel for removing the
roughness therefrom and dressing the same so
and in spaced relation, by means of suitable
straps l1 and I8 and cross straps I9, 20, 2|, and
22.
that they are ready for use in the manufacture
At one end of the machine there is provided an
electric motor 25 having a small V-pulley 21 hav
ing V-belts 26 thereon. These V-belts 26 are also
mounted on a V-pulley 28 disposed on a shaft 29
which is mounted in a suitable bearing 30 slid
ably mounted between the upper and lower side
10 angle bars II and I2 on one side, and I3 and I4
on the other side.
There is a suitable bridging member 3| dis
machine whereby the slats can be fed through
of a chair.
It is an object of this invention to provide a
posed between these angle bars, and an adjusting
screw 32 is mounted in these vertical bridging bars
wheels, providing elongated endless belts covered
with abrading material, whereby the slats after 15 3 l, by means of which the position of the bearing
3| can be adjusted relative to the upper and lower
being inserted into the machine will be automati
the machine and instead of having abrading
cally fed therethrough and both sides of the slats
angle bars II and I2, or l3 and I4. This shaft
29 has a smaller V-pulley 5:34 aflixed on its other
will be dressed and polished and all roughness
end on which a V-belt 35 is mounted, which
removed therefrom. Also, instead of having a
conventional abrading wheel, by having an elon 20 V-belt is also mounted on a larger V-pulley 36
?xed on a transverse shaft 31 mounted in suit
gated belt, a much greater length of time will
able bearings disposed between the upper and
occur between the times when a new abrading
surface must be provided.
lower angle bars on each side of the frame; these
bearings are held in position by means of suitable
It is another object of this invention to provide
an abrading machine having a pair of rollers on 25 bolts 38. This shaft 31 has a sprocket wheel 40
on its other end on which is mounted a sprocket
each of which is disposed an endless abrading belt
chain 4| which is also mounted on a sprocket
with spring means for pressing the rollers to
wheel 42 on a feed shaft extension 43, the feed
wards each other and feeding rollers disposed
shaft 43 being corrugated. This feed shaft 43 is
above and below the abrading rollers for feeding
30 slidably mounted in slots 44 in channel bars 45
the slats through the machine.
which are mounted for swinging movement of the
Some of the objects of the invention having
upper end of links 46 and 4‘! which are pivoted
been stated, other objects will appear as the de
at their ends in the upper channel bar II or I 3
scription proceeds when taken in connection with
the accompanying drawings in which:
as the case may be. This channel bar 45 is held
in swinging resilient position by means of com
Figure 1 is a side elevation of the machine;
pression springs 59 and 5| pressing against the
Figure 2 is a top plan view of the machine;
ends of the channel bar 45 and being anchored
Figure 3 is a vertical sectional view on an en
against angle irons 52 and '53 secured on the
larged scale and taken along the line 3-—3 in
Figure 2;
upper surface of the upper channel bars II and
Figure 4 is a vertical sectional view taken along 40 63. This shaft 43 at each side is mounted in a
slidably mounted bearing 54 clearly visible in Fig
the line 4—4 in Figure 3;
ures 3 and 4. The bearing 54 is also pressed to
Figure 5 is an enlarged side elevation of the
wards the right in Figures 3 and 5 by means of
central portion of Figure 1;
a compression spring 55 being disposed between
Figure 6 shows a form of slat or chair back
the closed end of the member 45 and the bearing
which can be operated upon by this machine;
54.
Figure 7 shows a form of slat having its endss
On the lower surface of the lower angle bars
reversely curved and which is adapted to be used
l2 and I4, respectively, a structure similar to that
in the manufacture of a chair seat.
described is also present. It comprises a pair of
Referring more speci?cally to the drawings,
numeral l0 indicates uprights and between these " links 60 and GI projecting downwardly, the lower
ends of which are pivoted to a channel bar 62
uprights Hi there are mounted two pairs of angle
identical in all respects to channel bar 45. This
bars H and I2 on one side and angle bars l3 and
channel bar 62 has slidably mounted therein a
H! on the other side. These are spaced apart
bearing 63 in which a second feed roller 64 is
from each other by suitable plates l5 welded
mounted, there being a member 62 at each side
thereto. They are held apart from each other,
2,404,917
3
4
of the frame and a bearing 63 at each side of the
thereon and this belt is also mounted on a
frame, This bearing 63 is resiliently pressed to
rubber roller I03 mounted at its ends in suitable
bearings HM sliding between the upper and lower
angle bars II and I2, and I3 and I4, respectively.
the right in Figures 3 and 5 by means of a com
pression spring 65 being disposed between the
bearings 63 and the closed end of the channel bar
62. Also a spring 66 presses against the left hand
end of the member 62 and tends to swing it to
the right in Figures 3 and 5.
The left hand end of this compression spring
Fixed on the upper angle bars II and I3 is a
pair of drive members I95 and IE6 which guides
the work piece 99 between the two feed rollers.
The two rubber rollers may be pneumatically in
?ated rollers, but they are shown as plain rub
ber rollers in the drawings. The roller I83 nor—
mally tends to move to the left in Figures 3 and
5 due to the force of a compression spring I01
which is loosely mounted around a rod I08 which
is ?xed in the bearing which‘ has its other end
sion spring 63 to thus balance the member 52 at
all times.
15 slidably mounted in a vertically disposed bridging
gap I59. On the shaft ‘I9 there is ?xed another
The lower roller 64 has a sprocket wheel ‘H
pulley III} on which other another abrasive belt
thereon. The sprocket chain 4! passes down
H is mounted, this belt being mounted also on
wardly and engages this sprocket wheel‘ ll be
a rubber roller II 3 the ends of the roller being
fore returning to the sprocket wheel 4%. This
causes both of the rollers 43 and 64 to rotate in 20 suitably mounted in bearings H4 at each end
thereof slidably disposed between upper and lower
a clockwise direction in Figures 3 and 5. 7
angles II and I2, and I3 and I4, respectively, and
At the other end of the machine there is an
is forced to the right in Figures 3 and 5 by
electric motor 75 having a small V-pulley ‘E5 on
66 is anchored by means of an angle bar 61 at
the left end and an angle bar 68 at the right
end while a compression spring 69 is at the right
hand end and counteracts the force of compres
means of a compression spring II5 surrounding
its motor shaft and on which is mounted a pair
of V-belts TI which are mounted on a V-pulley 25 a rod H6 one end of which is ?xed in the bear
ing H4 and the other end slidably mounted in
‘I8 affixed on a transverse shaft ‘I9 mounted in
suitable bearings 80 disposed between the hori
zontal angles H and I2, and I3 and I4, respec
tively.
A vertical bridging bar BI is provided between ;
the upper and lower angles on each side and a
set screw 82 is threadably mounted therein for
engaging the bearings 80 for adjusting the posi—
tion of the bearings relative to the angle bars
II and I2, and I3 and I4, respectively. The shaft
19 has mounted on the other end thereof 9, V
pulley 83 on which a V-belt 84 is mounted which
is also mounted on a \/-pulley 85 secured on one
end of a transverse shaft 86 and on the other end
of this shaft 86 is mounted a sprocket wheel 8?.
The shaft 86 is mounted in suitable bearings 88
disposed between the upper and lower angle bars
H and I2, and I3 and Id, respectively. The
sprocket wheel 8'! has mounted thereon a sprocket
chain 89 which is also mounted on a sprocket
Wheel 90 ?xed 0n the end of corrugated feed shaft
9! which extends through the machine and is
mounted in bearings 92 near each end thereof.
These bearings 92 are slidably mounted in the
channel bars 45 at each side of the machine and
they are pressed towards the other bearing 54
therein by means of a compression spring 93
being anchored between the closed ends of the
bars 45 and the bearings 92.
Also mounted in each of the lower channel
members 52 are bearings 95 in which the ends
of lower feed roller 96 are mounted. The lower
feed roller 56 has a sprocket wheel 91 ?xed on
the end thereof and sprocket chain 89 after pass
ing over sprocket wheel 96 passes over sprocket 60
a vertically disposed bridging bar I IT.
The belt I-JI is tensioned by means of idler
roller I26 being mounted between the free ends
of arms I2I which are pivoted at their ends to
vertical bridging bars I 22 secured between the
upper and lower angle bars II and I2, and I3
and Ill, respectively. The belt III is also ten
sioned by means of a roller l25 mounted between
the free ends of links I26 whose other ends are
pivotally secured to upright bridging bars I5 as
previously described.
In the drawings and speci?cation there has
been set forth a preferred embodiment of the in
vention, and although speci?c terms are em
ployed, they are used in a generic and descrip
tive sense only, and not for purposes of limita
tion, the scope of the invention being de?ned in
the claims.
I claim:
1. An abrading machine comprising a frame,
a pair of rollers mounted in the frame, spring
means for pressing the two rollers toward each
other, a pulley mounted in each end of the frame,
an endless abrasive covered belt mounted on the
rollers and their associated pulleys, means for
imparting rotation to the pulleys for imparting
rotation to the belts, the proximate surfaces of
the rollers moving in the same direction, means
on each side of the rollers for feeding a work
piece between the rollers in a direction opposite
to the direction of rotation of the proximate sur
face of the rollers, the means for feeding the
workpiece between the rollers comprising a piv
oted frame disposed on each of the opposite sides
of the rollers, resilient means for restraining
wheel 91 before returning to sprocket wheel Bl.
each pivoted frame against endwise movement in
The above-described arrangement allows the
both directions, each frame having a pair of feed
upper and lower sets of feed rollers to run in
rollers mounted therein, means for driving the
opposite directions, that is, with their top por
tions running towards each other so that they 65 proximate surfaces of the feed rollers in the same
direction to feed the workpiece between the roll
tend to feed the work pieces through the ma
ers having the abrasive belts thereon, and guid
chine by rotation of the same. The lower mem
ing means disposed between the rollers having
ber 62 in which bearings 63 and 95 are mounted
the abrasive belts thereon.
has pivoted on these bearings a pair of members
2. In an abrading machine for abrading the
518 and 98a having sloping surfaces. These mem 70
surfaces of a wooden workpiece such as chair
bers 98 and 98a rest on the feed rollers 64 and
96, respectively, and tend to guide the lower end
slats and the like, a main frame having a pair
of a work piece 99 through the lower feed rollers.
of resilient rollers mounted approximately mid
Mounted on the shaft 29 is a pulley Iilil which
way of the main frame, a pulley mounted near
has a belt I III of abrasive material mounted 75 each end of the main frame, a pair of endless
2,404,917
6
abrasive belts, th'ere being a belt mounted on
each feed roller and a pulley near the end of the
main frame, means for driving the belts and. the
rollers so that the proximate surfaces of the roll
ers move in the same direction, means for resil
iently pressing the two rollers toward each other,
a swinging frame member mounted on each side
of the main frame opposite the rollers, resilient
means for permitting endwise movement of the
swinging frame members relative to the main
frame but normally tending to hold the frame
members in a given position, a pair of feed rollers
mounted in each of the frame members, there
being a pair on each side of the rollers on which
the abrasive belts are mounted, means for driv
ing the abrasive belts and for driving the feed
rollers so that the feed‘ rollers have their proxi
mate surfaces moving in the same direction and
in an opposed direction to the direction of rota
tion of the proximate surfaces of the rollers on 20
urging the proximate ends of the belts towards
each other so that a workpiece can be passed
therebetween to finish the same, a pair of resil
iently mounted feed rollers disposed on each side
of the rotatable means on which the proximate
ends of the abrasive belts are mounted for feed
ing a workpiece between the proximate ends of
the abrasive belts and means for driving the feed
rollers so that their proximate surfaces move in
the same direction and for also driving the abra~
sive belts so that their proximate ends rotate
in the same direction but in a direction opposite
to the direction of rotation of the proximate sur
faces of the feed rollers.
4. An abrading machine comprising a pair of
resilient rollers, a pair of power driven pulleys
rotatably mounted remotely from each roller, a
pair of endless belts having an abrasive covering,
there being a belt mounted on each roller and its
remotely associated pulley, a swinging resiliently
mounted frame disposed on each of the opposite
which the abrasive belts are mounted, and
sides of the rollers and each frame having a pair
means for guiding the end of the workpiece after
of driven feed rollers for pushing and pulling a
the piece goes through one set of feed rollers and
workpiece between ‘the resilient rollers, and
between the abrasive belts into a position be
tween the next set of feed rollers.
25 means for driving the feed rollers at a low rate
of speed and for driving the rollers carrying the
3. An abrading machine comprising a pair of
belts at a faster rate of speed.
endless abrasive belts, a pair of rotatable means
ELMER CONDA MURDOCK.
for supporting the belts for rotation, means for
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