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Патент USA US2411085

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NOV- 12, 1946-
D. DOHERTY
2,411,085 '
DOUBLE BELT SANDER
Filed June 8, 1944
4 Sheets-Sheet 1
Inventor
' [JAN/£4
00/1512 7')’,
Nov. 12, ‘1946.
D. DOHERTY
2,411,085
DOUBLE BELT SANDER
Filed June 8, 1944
By
A.»
WW
4 Sheets-Sheet 2
NOV. 12, 1946.
D_ DOHERTY
2,411,085
DOUBLE BELT SANDER
Filed June 8, 1944
4 Sheets-Sheet 5
l?
Inventor
406%
B, QM
Mk!
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Aftomqys
Nov. 12, 1946.-
D. DOHER'TY
2,411,085
DOUBLE BELT SANDER
Filed Juné 8, 1944
4 Sheets-Sheet 4
/9
2/
Inventor
Patented Nov. 12, 1946
2,411,085
UNITED STATES PATENT OFFICE
2,411,085
DOUBLE BELT SANDER
Daniel Doherty, Los Angeles, Calif.
Application June 8, 1944, Serial No. 539,247
7 Claims.
1
This invention relates to a double belt wet
sander which is expressly, but not necessarily,
adapted for properly and accurately sanding
plastic blocks and the purpose of the invention
is to provide a feasible and practicable motor
driven parallel belt assemblage susceptible of
achieving desired aims with reliability and ex
pediency.
In carrying out the principles of the invention
I provide a suitable frame structure, this to ac
comrriodate motor-driven upper and lower parallel
belts, there being means for bodily moving the
belts toward and from each other in parallelism
and‘ an arrangement between the adjacent ?ights
of the belts to accommodate an especially con
structed work holder which deploys the work in
effective sanding relation to said belts.
u
Another phase of the invention has to do with
spray nozzles for spraying jets of water against
the ends of the belts, this for purposes of keeping
said belts s‘u‘f?ciently wet and moist to achieve the
desired abrading and surfacing results.
Novelty is also predicated upon the adoption
(01. 51-440)
2
reference numerals it will be seen that the main
frame structure comprises suitable supporting
legs 6 and vertical end panels or uprights ‘l and
horizontal connecting rails 8 at the top, the latter
being sufficiently open to permit access to be had
to the upper portion of the structure.
The upper and lower belt assemblies are de
noted by the numerals 9 and I0, respectively.
Each is the same in construction and the descrip
tion of one will suffice for both. Reference being
had to the upper unit or assemblage 9, this com
prises a substantially U-shaped frame having a
longitudinal connective or bight portion H and
transverse ends [2. The end members are pro
15 tided with feed nuts [3 through which the vertical
feed screws [4 extend. These feed screws are
properly mounted and the upper ends extend
above the frame structure and are provided with
beveled gears 15 coacting with beveled gears IE
on the ‘ends of the horizontal adjusting shaft 17.
This shaft is provided at its center with beveled
pinions l3 coacting with an associated pinion
I9 on the shaft of the hand wheel 29. As seen
in Figure 4 this hand wheel and‘ shaft is mounted
belts, this to trap the water and to thereafter 25 for operation in an appropriate ?xture or bracket
drain it off as conditions require.
2!. Thus, the frames which accommodate the
Additional novelty has to do with the provision
units 9 and I!) are adjusted up and down in
and’ use of a vertically or perpendicularly adjust‘
parallelism. The threads on the feed shafts or
able shelf, this to accommodate the work while it
screws M are oppositely arranged to accomplish
30
is being taken out of the work holder and also
, this method of moving the units 9 and Ill toward
to assist in placing the work in said holder‘ before
and from each other.
the holder is slid in between the active flights of
At the left (see Figure 3) the frame is provided
said belts.
with a lateral arm 22 terminating in an adapter
. Further novelty is predicated upon the provi
23 having a bearing to accommodate the shaft
sion of a specially constructed work holder, this 35 24 of the drum 25. At the opposite end I provide
being a simple clamp such as expedites insertion
a ?xed‘ yoke 26 which serves to support the rela
and removal of the work.
tively slidable yoke 21, the latter serving as a
and use of a collection receptacle underneath the
Other features and advantages will become
hanger for the right hand drum 28. The yoke 27
more readily apparent from the following descrip
is adjusted by the set screws 29 to thus tauten
tion and the accompanying illustrative drawings.’ 40 the endless sanding belt’ 3!} the latter trained
In the drawings, wherein like numerals are
over said pulleys. In Figure 1 it will be seen
employed to designate like parts throughout the
that appropriate parallel platens 3| serve to
same:
properly sustain and support the upper and lower‘
Figure 1 is a side elevational view of a twin
?ights of the belt.
belt wet sander constructed in accordance with 45
As seen in Figure 1, each belt is provided with a
the principles of the instant invention.
Figures 2 and 3 are horizontal longitudinal sec
tional views taken approximately on the planes
water supply nozzle or pipe 32 fed by an appro
priately controlled delivery or supply hose 33.
The jets face the belt and the water is controlled
of the lines 2-2 and 3-3, respectively, of
to wet or moisten the belt to the desired degree.
Figure 1, looking downwardly in the direction of 50 The shafts and the belts are provided with ap
the arrows.
‘
.
propriate ‘pulleys 34 to accommodate motion trans
Figure 4 is a central vertical section.
mitting belts 35 which, in turn, connect with
igure 5 is a perspective View of the clamping
pulleys 36 on the shaft of themotor 31. This
type work holder.
motor
‘is supported on a- platform 38 having an
Referring now to the drawings by distinguishing 55 adjusting
slot 39 to permit movement of the motor
2,411,685
3
the receptacle.
'
drawings. Therefore, a more lengthy description
is regarded as unnecessary.
Minor changes in the shape, size and arrangement of details coming within the ?eld of inven
tion claimed may be resorted to without depart
ing from the spirit and scope of the invention as
claimed.
10
‘
will be seen that the aforementioned work-ac
commodation shelf is indicated at 44, this being’ I
mounted on the shaft 45 adjustably held‘ in place
. --
.~
'
Having described the invention,_what is claimed
I direct attention again to Figure 4, where it
by a set-screw arrangement 46.
4
sidering the description in connection‘ with the
toward and from the main frame structure. The
part 49 is a stabilizing link for the motor.
As seen in Figure 4, 4! denotes a receptacle or
pan which is located at the bottom of the frame
structure and underlies the belt assemblage to
trap the water. This has a suitable drain 42.
Also, at the front it is provided with a chute 43
which traps water which drips from the work
holder and returns the same to the main part of
as new is:
‘
I‘ 1
~
'f_
1. In a work sander of “the class described, a
relatively stationary main frame having a pair
of feed screws vertically mounted for rotation
therein, an adjusting shaft mounted for rotation
atop said frame, operating means for said shaft.
.715 and operating connections between the ends of
Coming now to the work holder reference is had
to Figure 5 where it will be seen that this is de-,v I
noted as a unit by the numeral 41. It is .a slid- V
able frame and includes end members 48 which
slide in guideways 49 on the track rails 50. The 20
work holder also includes an abutment 5| and a
said shaft and said feed screws, an auxiliary sub
stantially U-shaped frame having a longitudinal
connective portion and transverse ends within
the limits of the ?rst-named main frame having
means adjustably mounted on said feed screws
whereby to raise and lower said U-shaped frame,
drums mounted in said U-shaped frame, an end
less belt trained over said drums, and a water
the stem 55 is connected with the clamping bar 25 spraying nozzle mounted in said frame to coact
with one end of the belt, in the manner and for
52 and said stem is, in turn, provided with a han
dle 56, the stem operates through guides 51, these
the purposes described.
located between the spaced parallel rails 58. An
2. In a work sander of the class described, arel
other bar 58 in the frame structure serves to com
atively stationary main frame structure, upper
plete the frame and to accommodate the han 30 and lower horizontally disposed and spaced belt
units, eachbelt unit comprising a frame located
dle 60.
spring-pressed clamping bar 52, this being pressed
in place against the work 53 by coiled springs 54.
A T-shaped handle arrangement is provided and
The work holder 4‘! is bodily removable from
the sustaining and guiding track devices and it
within the marginal limits of the aforementioned
frame structure, drums mounted for rotation ‘in
said frame, and an endless sanding belt trained
out over the chute 43 so as to facilitate handling 35 over the drums; a motor supporting platform
of said work holder. In practice, the work 53 is
projecting from one end of said frame structure
and located in aplane representing an imaginary
simply clamped between the abutment rail 5| and
the spring-pressed clamping bar 52, this by con
line between the upper and lower belt units, a mo
tor shiftably mounted on said platform, and indi
venient operation of the handle means 56. Usu
ally the block of work is placed on the table or 40 vidual operating connections between the motor
shelf 44 so that it is bodily supported and the
shaft and the respective adjacent drums of said
frame is then aligned with the shelf and the Work
upper and lower units, said operating connections
being adjusted by the shifting of the motor on the
is clamped between said parts 5| and 52. The
table serves to uniformly place the block or work
platform.
>
~
in place so that one-half extends above the frame 45
3. In a work sander of the class described, a rel
atively stationary main frame structure, upper
and the other half below.
~
and lower horizontally disposed and spaced belt
The work clamped in the holder is positioned
units, each belt unit comprising a frame located
between the inner ?ights of the belts and the belts
within the marginal limits of the aforementioned
are set into operation to accomplish the job in
an evident manner. The water as before ex 50 frame structure, drums mounted for rotation in
said frame, and an endless sanding belt trained
plained is sprayed from the nozzles 32 on the belts
over the drums; a motor supporting platform pro- ’
and the belts sand the work with expediency and
jecting from one end of said frame structure and
convenience. Of course, it is necessary to adjust
located in a plane representing an imaginary line
the belt assemblies toward and from each other
into desired spaced relation to accommodate the 55 between the upper and lower belt units, a motor,
shiftably mounted on said platform, and individ
type of work which is placed in said holder. The
ual operating connectionsv between the motor
holder acts somewhat like a drawer and can be
will be noted in Figure 4 that these devices extend
conveniently slid in or slid out.
When it is slid
out, the job being ?nished, the work is deposited
on the shelf 44 where it can be thereafter con
shaft and the respective adjacent drums of said
upper and lower units, said operating connections
60 being adjusted by the shifting of the motor on the
veniently removed.
platform, together with a link pivotally connected
It is evident too, that the top belt can be used
individually. That is to say, in certain hand jobs
where it is desired to‘ press the work by hand,
at one end with the motor and pivotally con
nected at its opposite end with one of the adja
cent drums.
maneuvered in a well known manner.
,
4. In a work sander of the class described,
against the belt, the work is placed in through the 65
a relatively stationary main frame provided with
open top of the structure and is manipulated and
However, and as a general
a pair of vertical feedscrews mounted for rota
tion, an adjusting shaft mounted for rotation
atop the frame, operating means for said shaft
proposition the top is left open to permit access
and operating connections between the ends of
to be had to the top belt when it is used individu
said shaft and said feed screws, an auxiliary’
In practice, it is intended to enclose the belt
‘ units and other parts.
ally.
It is thought thatpersons skilled in the art to
which the, invention relates will be able to obtain
a clear understanding of the invention after con
substantially U-shaped frameHhorizontally ar
ranged and positioned within the limits of the
?rst named main frame, said U-shaped frame
75 being provided with parallel vertically spaced
2,411,085
platens, and having adjustable devices at outer
ends connecting same with said feed screws for
raising and lowering the U-shaped frame, drums
mounted in said U-shaped frame, an endless
belt trained over said drums and said platens,
the platens serving as backing elements for the
upper and lower ?ights of said belt, a water
spraying nozzlev mounted in said main frame to
coact with one end of the belt, and a water
6
relatively stationary frame structure, upper and
lower parallel endless sanding belts adjustably
mounted in said frame structure and in super
posed relationship, means for spraying water on
the ends of the belt, a water collecting pan
mounted in the frame beneath said sanding belt
and also beneath said water spraying means, this
for trapping and collecting water, a pair of hori-.
,zontally disposed and aligned guide tracks
trapping and collecting receptacle mounted in 10 mounted in said frame and located between the
said main frame beneath said U-shaped frame
adjacent opposed ?ights of said sanding belt,
and belt also beneath the water spraying nozzle.
said guide tracks being of lengths to determine
5. In a work sander of the class described, a
within the marginal limits of said water col
relatively stationary main frame provided with
lecting receptacle, a clamping frame-like work
a pair of vertical feed screws mounted for rota 15 holder adjustable in said guide track and mov
tion, an adjusting shaft mounted for rotation
able in drawer-like fashion in and out in respect
atop the frame, operating means for said shaft
to the adjacent ?ights of the respective belt.
and operating connections between the ends of
7. In a work sander of the class described, a
said shaft and said feed screws, an auxiliary
relatively stationary frame structure, upper and
substantially U-shaped frame horizontally ar 20 lower parallel endless sanding belts adjustably
ranged and positioned within the limits of the
mounted in said frame structure and in super
?rst named main frame, said U-shaped frame
posed relationship, means for spraying water on
being provided with parallel vertically spaced
the ends of the belt, a, water collecting pan
platens, and having adjustable devices at outer
mounted in the frame beneath said sanding belt
ends connecting same with said feed screws for
raising and lowering the U-shaped frame, drums
and also beneath said water spraying means, this
for trapping and collecting water, a pair of hori
mounted in said U-shaped frame, an endless belt
zontally disposed and aligned guide tracks
trained over said drums and said platens, the
mounted in said frame and located between the
platens serving as backing elements for the
adjacent opposed ?ights of said sanding belt, said
upper and lower ?ights of said belt, a water 30 guide tracks being of lengths to determine within
spraying nozzle mounted in said main frame to
the marginal limits of said water collecting re
coact with one end of the belt, and a water
trapping and collecting receptacle mounted in
ceptacle, a clamping frame-like work holder ad
justable in said guide track and movable in
said main frame beneath said U-shaped frame
drawer-like fashion in and out in respect to the
and belt also beneath the water spraying nozzle, 35 adjacent ?ight of the respective belt, and Work
and a work placement and removal shelf verti
placement and removal shelf means vertically
cally and adjustably mounted within the limits
and adjustably mounted within the limits of said
of said water collecting receptacle and arranged
receptacle and adapted for coaotion with said
in a position to coact with work holding means
tracks, as well as said clamping frame-like Work
such as is adapted for disposition beneath the 40 holder.
lower ?ight of the belt.
DANIEL DOHERTY.
6. In a work sander of the class described, a
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