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Патент USA US2399923

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May 7, 1946.
F. HARRIS
2,399,923
‘SANDING DRUM
Original Filed Feb. 11, 1942
'
INVENTOR
F'onjs Z 1-63 rris
ATTORNEYS
Patented May 7, 1946
2,399,923
"UNITED; STATE s
' ,
v
PATENT ' OFFICE’
2,399,923‘v " l
SANDING DRUM
‘
. .Forist Harris, Merced, Calif.
" original application Fbbruary,11‘,'1942,§seria1 ‘No;
430,374, now PatentNo. 2,375,102, ‘dated May 1,,
ivided‘and this application February 17,
> >1945,Serial1N0.'5!78','388
,
5 Claims.
(01. 51-4194) '
This invention relates" in‘ general to ‘?oor
naled in the sanding machine, and which end
sanding machines, and in particular“ the in
shafts carry drive pulleys 3._ The ‘drum l is cir
vention is directed to, and itis an object to
‘cumferentially faced from endfto' end thereof
provide, a“ sanding drum‘ including ‘unique
means for readily and quickly attaching an ini,e
tially separate sanding ‘strip to ' the drum in
helically wound relation whereby said strip is
continuous circumferentially ‘ of the drum and
from end to end thereof,“
’
,
‘
"
‘
with a semi-resilient‘material, such as a thick
‘ felt pad 4.
“The-sanding ‘strip is indicated generally at 5
and tojenablethis sandingvstrip to extend con—_
tinuously about‘ the circumference of the drum
without anyv break it is wrapped spirally or heli-'
They present application is‘ a ‘division as to
all‘ common‘ subject matter of. copending“ ap
plication, Serial No. 430,374, ?led February 11,
1942, on Floor sand machine, now Patent, No.
cally‘t‘hereabout from one: end to the‘other, as
2,375,102, issued ‘May 1, 1945.
strip ‘beingiindicated at‘ 6 and'l, respectively.
‘
shown‘. ‘ 'I'hestrip S'tapers to a point at each end
in order not to project," beyond corresponding
ends of thejldrum l;‘.said pointed'ends of 'the '
Another object of the present invention is to
At one end of the drum the pointed end 6 is
embody, in a ?oor sanding machine drum,
secured to said drum by a removable pin or the
means for maintaining the helically wound
like, as indicated at 8. At the other end of the
sanding strip under tension and taut about the
drum the pointed end 1 of the strip 5 is Secured
by a headed pin 9 to a plunger I0 slidable in a
drum at all times; such means including a
spring arranged to constantly exert a pull on the 20 cylinder ll embedded in the pad 4 just under
the sanding strip and disposed parallel to the
strip from one end thereof, the other end of
the strip being attached to said drum.
slope or pitch of the spiral or helix; the pin
riding in a longitudinal slot S formed in the top
A further object of the invention is to pro
of said cylinder. The cylinder II is attached
duce a simple and inexpensive device, and yet
one which Will be exceedingly effective for the 25 to the drum l by cars I2 having screws l3 pass
ing therethrough into said drum.
purpose for which it is designed.
The head of pin 9 is disposed slightly inwardly
These objects are accomplished by means ofv
of the outer face of the pad 4, and the adjacent
such structure and relative arrangement of
pointed end 1 of strip 5 has an aperture l4
parts as will fully appear by a perusal of the
following speci?cation and claims.
In the drawing similar characters of refer
ence indicate corresponding parts in the sev
eral views:
Figure 1 is a plan view of a sanding drum,
detached, embodying the present invention.
Figure 2 is an enlarged fragmentary plan
view, partly in section, and with the sanding strip
partly broken away, to show the strip tension
30 therethrough adapted to engage about pin 9 be
neath the head of the latter.
The plunger is normally urged outwardly or
toward the adjacent end of the drum by a spring
I5 in the cylinder behind the plunger, so as to
, always maintain a tension on the strip 5 and to
take up any slack in the latter as the same be
comes more tightly wrapped about the drum with
driving rotation of the same.
In order to enable the plunger to be positively
ing device as in use.
Figure 3 is an enlarged fragmentary plan view 40 retracted in the cylinder preparatory to engage
ment of the pin 9 through the aperture M in the
of the end of the sanding drum which carries
adjacent pointed end 1 of the strip 5, the outer
the tensioning device; the adjacent end of the
end of the cylinder II is tapped, as at l6, for en
sanding strip being turned back, and the ten
gagement with a screw or bolt ll, whereby the
sioning device being shown in its retracted po
advance of this screw will retract the plunger
tion preparatory for engagement with said adja
to the desired extent. When connection of the
cent end of the sanding strip.
Figure 4 is a fragmentary cross section on line
‘pin 9 with the pointed end ‘I has been made, the
screw I1 is withdrawn and thereafter the plunger,
4-4 of Fig. 2 showing the tensioning device as
and the strip secured thereto, are subject to the
connected with the adjacent end of the sanding 50 tension of spring l5.
strip.
From the foregoing description it will be read
Referring now more particularly to the char
acters of reference on the drawing, the numeral
l indicates the drum of a sanding machine,
which includes end shafts 2 adapted to be jour
ily seen that I have produced such a. device as
substantially ful?lls the objects of the invention
as set forth herein.
While this speci?cation sets forth in detail the
2
2,399,923
present and preferred construction of the device,
still in practice such deviations from such de
tail may -be resorted to as do not form a depar
ture from the spirit of the invention, as de?ned
by the appended claims.
Having thus described my invention, what is
claimed as new and useful and upon which Let
ters Patent is desired is‘:
1. In a sanding machine drum, a sanding strip
from end to end, means to secure the strip at
one end on the drum at one end thereof, a cyl
inder mounted on the drum at the other end
under the strip adjacent the corresponding end
thereof and substantially parallel to the slope of
the helix, a plunger slidable in the cylinder, a
spring behind the plunger tending to force the >
same out, and means securing; the; adjacent end
of the strip to said plunger. '
Wrapped helically about the drum from end to 10 4. In a sanding machine, a sanding drum, a
sanding strip wrapped helically about the drum
end thereof, means to secure the strip at one
end on the drum in a ?xed position, a spring-V
advanced plunger, means mounting the plunger
. from end to end, means to secure the strip
at one end on the drum at one end thereof, a
on the drum guided longitudinal movement‘sube
‘cylinder? mounted on the drum at the other end
stantially parallel to the pitch of the helix of
, under the strip adjacent the corresponding end
the strip and attached adjacent the
of" . thereof and substantially parallel to the slope of
‘the helix, a plunger slidable in the cylinder, a
the latter, and means to secure- the, plunger-to
said other end of the strip;' said plunger‘func '
behind the, plunger tending to force the
tioning to exert a continuous pull on said strip.
same out, and means securing the adjacent end
in a direction to closely wrap the same about 20 of- the strip to said plunger; the drum including
the drum.
.
av semi-resilient facing of substantial thickness
and the cylinder being fully embedded in said
2. In a sanding machine, a sanding drum,‘ a
facing, said securing means comprising a headed
sanding strip wrapped helically aboutfthe. drum
from end to end, means to secure thev strip at
pin. projecting outwardly from; the plunger with
one end on the drum at one end thereof, a cyl
the head of said pin disposed inwardly of the
periphery of said facing.
inder mounted on the drum at the other end ‘un
der the strip adjacent the corresponding end
thereof and substantially parallel to thelslope of
5, A sanding drum, as in claim 2 in which the
outer end of the cylinder is exposed to the cor
responding end of the drum; the outer end por
the helix, a plunger slidable in the cylinder, a
spring behind the plunger tending to. force the 8.0 tion of said cylinder being tapped for the re
ception of a screw adaptedto engage and retract
same out, and a securing pin projecting through
the strip and into the plunger.
the plunger against the. action of the spring.
FORIST HARRIS.
3. In a sanding machine, a sanding drum, a
’ sanding strip wrapped helically about the drum
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