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Патент USA US2404105

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Juäy 16, 1946.
R. H. sMlTH
Filçd July 1, 1944
2 Sheets-Sheet 1
„Fuäy E6; 1946.
R. H.
Filed July 1, 1944
2 Sheets-Sheet 2
Patented July 16, 1946
Rohley Hume Smith, The Dalles, Oreg.
Application July‘l, 1944, Serial N0. 543,125
1 claim. (Cl. 51-187)
completing the tool, said sections described in de
'I‘he object of this invention is to supply a sat
isfactory tool for holding sandpaper securely
tail hereinafter.
while being used to roughen or smooth surfaces,
Section 1, the sandpaper matrix, in a general
whatever the contour, that require recoating with
sense is composed of Va dual series of` light sheet
.metal units and resilient fabricunits strung in al
enamel, varnish, paint or similar material.
A further object of this invention is the provi
ternation on a pair of rods 8 in aY manner to be
known as loose-fitting and tight-ñtting, respec
sion of a tool which does not overreach the ñexi
ble limitation of sandpaper by a thoughtless dis
tively. The metal units as shown Yin vFigure '7,
designated numerically as I, 2 (implied „in the
union of grit, glue and paper incident to a too 10 break-away but shown in Figure 5), L5 and ,6,
while the fabric units are designated as 1V and 26,
sharp a curve at the holders or to the use of ser
regard of disrupting the cohesive strength in the
rated clamps.
said dual units either metal or fabric easily rec
ognized, independent of numerical notationsVby
A further object of this invention is to obtain
a mere glance at the drawings shown as Figures
greater economy in the use of sheet abrasive.
Other advantages will be apparent from the 15 1, 3, 4, 5, 6, 7 and 8.
Moreover, section 1, the sandpaper matrix,'in
a specific sense, has its various parts and ele
In the drawings:
I i
Figure 1 is a perspective viewof my new and
ments described in detail now, eachin the order
of its assemblage, starting with the metal strip 5,
improved sandpaper holder.
specification and drawings.
Figure 2 is a perspective View of one of an iden 20 Figure 1, known as a splint per se and shown as
isolated in Figure 4 and meant to be placed (in
tical pair of sandpaper locking devices. \
the assemblage) in close contactwith a fabric 1
Figure 3 is a perspective-view of one of several
as inFigure 3, said fabric known as av felt pad
identical felt pads.
(being composed of twofold fourply pieces of
Figure 4 is a perspective view of one of several
identical metal elements for helping to hold the 25 felt) . sewed 1A for holding the folds together
felt pads in alignment.
while punching the holes 9 and creating the
Figure 5 is a perspective view of two main
frame elements that, considered as a pair, or sep
arately, are duplicated.
vFigure -6 is a sectional view of the tool take
curves at each end, said curves within .thelimit
(by design) of the flexibility of the sandpaper for
taking the said curves Without a disruption of
grit, glue and paper, said splint per se helping to
on line 6_6 of Figure 7,
keep the felt pad in alignment, being aided Vin
that function by having its lower line coincident,
Figure 7 is a, plan view of the tool, partially
broken away for convenience of illustration.
Figure 8 is a sectional view of the tool, taken
on line 8_8 of Figure '7.
« «»
With regard to the drawings, as identified,
they are to a certain extent freehand illustrations
' of the shapes, sizes and positions of the standard
« ized or implement parts of the invention, hence
said‘drawings are not altogether precise, nor in- >
tended to be any other than approximations-_a
principle, I would have it understood, suggestive
-of anticipated modifications within reason, of
course, and in accord with the >scope and spirit
of my invention.
, »'
>or practically so, with the broken line 1A,> mean
ing close to, not upon the folds of the felt pad;
(glance at Figure 8 at the multiple folds of as
many felt pads for easy comprehension of the
reference to folds) .
And now follows in the as
semblage a fabric unit 26 consisting of a onefold
twoply piece of felt (not exactly a preferable ma
terial because of a war priority) known as a
guardrail used as a protective appurtenance for
avoiding the creation of a blemish from anabrupt
inoautious approach to surfaces that must not be
scratched by sandpaper, citing chrome `strips on I
automobile bodies, for example. This guardrail
Figure 1 shows a complete embodiment of the
tool loaded with sandpaper IS and ready for use,
26 is a shallow border of felt adjacent to thellat
eral edges of the sandpaper I6. In making use
comprising three divisions; namely, the handheldV
of the guardrail, the operative needs definite in
struction, for he might not even guess its signifi
24 (section 3) indicated in Figures 6 and 8, the
pair of identical sandpaper locking devices Il 50 cance or the method of using it to an advantage
except for enlightenment to be given presently
t (section 2), onev clearly illustrated in Figure 2,:
both indicated as emplaoedin Figures 6, 7 and 8,
under the title “Using the tool.”
and the sandpaper matrix (section l) minus a
Section 1 containing next in the order of as
semblage a pair of main frame elements l and 2
shown in Figure 5 as isolated and in Figure 8 as
numerical designation in the drawings but con
taining-all’the remaining parts and elements for-
combined with other elements, each of said main
frame elements I and 2 having along its rec
tilinear top line a ninety degree crimp with a
depth the thickness of a felt pad, Figure 3, where
as, the said element I, Figure 5, is provided with
holders having a twofold gripping value, one oi
which ascribed to a frictional contact of the sand
paper I6 with the lips III and I5 when the nuts
a pair of sawtooth crimps on its lower line, one
tool), the other gripping value ascribed to the
curve of the clamps. But notice that the lips
are pendent, meaning that they swing beyond
at each end, by means of which, in combination
with its own top line crimp and that of its
fellow element, the elements I and 2 as shown in
23 are tightened (always by the fingers, not a
wrench, as in the case of all other nuts in the
the ends of the main frame elements I and 2.
Figure 8 are held apart and parallel preventing 10 So, .inasmuch as the jaws I2 and I3 straddle the
upper opposite main frame elements <I as shown
thereby a possible pinching of the metal inem
in Figure '7, a thin sheet of sandpaper with its
ber I2 (see Figure 2) shown in Figures ’7 and 48
fine-bolted grit cannot be clamped securely,
as inserted between the top line crimps of the
hence the need of the pendent lip and a second
said main frame elements. In such a position,
the metal member I2 must have a freedom of 15 ary molecular spring in the upper jaw I3, said
spring pivoted along the line of contact of the
movement as the need requires and gets it as a
lower edge of parallelepiped ñgure (in the upper
shuttle in a pair of perfect races.
jaw) with the topmost main frame elements, a
Let it be noted now that the main frame ele
provision that solves the problem of clamping
ments I and 2, Figure 8, are apparent splints,
one on each side of afelt pad, each of said ele 20 thin sandpaper. The lower jaw I2 described al
ready in section 1 asa shuttle (though for a
ments to be known as a resolved splint in the ap
moment only) provided with proper races which
pended claim, as distinguished from a splint per
are the crimps of the paired main frame ele
se, Figure 4, so named, first, because its lower
ments I and 2 as shown in Figure 8, and denoted
iline has the form and the position, hence the
function, .of a splint per se. and because, second, 25 as a counterpart to a complement in section l,
has a molecular spring pivoted at the lines where
the said main frame elements have other func
the flanks ofthe jaw break away from the races
tions, vas complements to counterparts, noted
as shown in Figure '7, said molecular spring de~
hereinafter in the novel act of combining in
termines the strength in the snap of the pawl
stantly the three sections of the tool into an in
tegrated whole. So far ñve units have .been 30 into a ratchet notch 28 as shown in Figure 6 for
holding section 1 to section 2, said flanks of the
strung on Vthe rods 8 and described. On the op~
jaw when thernuts It are tightened on the rods
posite ,side of >the tool are duplicate units as
8 as shown to be done as yet in Figure 8, act as
shown in Figure 7 or 8 and in reversemaking the
stabilizers of the tool when brought in close con
original group and the duplicated group of units
tact with the sides of the outer opposite main
represent so called rights and lefts, as it were. .
frame elements I.
Between said groups of units, as shown in the
plan view of the tool, Figure 7, Aare by .actual
count ten fabric units 1 ,and nine metal units 5.
The central metal unit 6 Yas >shown in Figure. 6
clearly illustrated as a ratchet plane 21 with
its notches 28 and manifestly a complement, in
Underneath the lower jaw I2 ofthe mouth II
, as shown in Figure 8 is a bolthead. locking de
vice, one of an identical four in the tool, said
locking device consisting of a rectangular strip
2I of light sheet metal bent to slip into the groove
duplicate, to its counterpart readily> recognized
22 of the bolthead for holding it fastwhen the
nut 23 of the bolt 2B is used. The hole in the
Vasa pawl, completes the assemblage and, like the
metal strip 2I has the diameter of the bolt 29,
main frame elements, is to be known .as a re
solved splint also. But notice further in ’this 45 said strip with the bolt thrust through it is held
close up to the jaw I2 through which the bolt
section 1 .that the top Ylines of the two opposite
protrudes in a tight ñt and extends thro-ugh the
and vduplicate main frame elements 2 are in an
upper jaw I3 vwith the hole in it designedly loose
imaginary plane vabove the common level of the
ñtting, thence the bolt 29 is passed through a
feltpads and the splints per se, allowance being
made thereby for the yneeded space required by 50 pearshaped hole 25, one of four and identical, in
the shell-like handhold 24 indicated in the Fig
the bolthead 2l and its 1ock22 as indicated in
ures 1 and 8, and shown ñnally with its end pro
Figure 8, said bolthead locking device placed di
truding for the reason that the said boltend, in
rectly beneath the so-called shuttle member I2
company with three others of its kind, is to be
inserted between the top line crimps of the two
opposite pairs of main frame elements I and 2, 55 known as a bitching post -in the nature of a com
plement to a counterpart when section 2 is
shown likewise in Figure 8 and later amplified.
hitched to section 3.
SectionZ, an .identical pair of sandpaper lock
Section 3, the handhold 24, with its position
ing devices, shall vbe `called a square-j awed mouth
illustrated in Figures »1, 6 and 8, consisting of a
II with pendent lips I4 and I5, referring to one
of the pair indicated in Figure 2. The lower jaw 60 rectangular piece of light sheet metal in the
shape of a shell the whole of which forming a
I2 is stationary; the upper jaw I3, movable. As
molecular Yspring pivoted on the boltends 20 next
illustrated, the mouth II is agape and held thus
to the nuts 23 by by means of four pearshaped
by a full lengthmolecular spring pivoted at I3A.
,holes created from overlapping circles, the small
accounting for the upward movement of jaw I3,
while the use of the nuts 23 on the bolts 2B eX 65 er ends of such composite holes being -semicircles
having the diameter of the bolts 20, said molec
hibits the force for a downward movement of the
ular spring in all the illustrations is active, not
jaw which in moving describes an arc unham
inert, and therefore the force for holding the
pered by the threads of the vertical bolts 29 inas
four semicircles jam against the troughs in the
much as the holes in said upper jaw through
which the bolts 20 are thrust are large enough 70 threads adjacent to the nuts 23 as illustrated and
hereinafter described more fully when the mo
to permit the freedom of movement along the
lecular spring is inert at the moment for at
predetermined arc with no obstructive entangle
taching the section 3 to section 2.
f ment of Vthe light sheet metal jaw in the troughs
As `to joining (or disjoining) the three'sections
of the threads. ‘The lips I4 and I5 are the
sandpaper I6 holders as shown in vFigure 6, said 76 of the tool into an integrated whole almost in a
ñash, note Figure 7 in which the pair of sand
paper locking devices II, known as section 2,
at the opposite end of the tool and taking up
the slack in the paper for a ñnal fastening, using
are attached to the sandpaper matrix known as
section 1. In separating section 2 from section 1,
I loosen the nuts III on the rods 8 the least bit,
ñrst, an act for disengaging slightly the hold
the outer main frame elements I at the opposite
sides of the tool has on the flanks of the lower
jaw l2 Figure 2 more clearly shown; second, I
lift the pawl I3A, Figure 2, or shown more clear
ly in Figure 6 as occupying a notch 28 in the
Take note that the lips I4 and I5 are curved
and represent arcs that are a prolongation cf
the original arcs shown at the ends of feltpads
over which the sandpaper is passed, in being
loaded and used, with no sign of having reached,
disastrously, beyond the limitation of flexibility.
In using the tool bear in mind that the sand
paper has a background of several folds of felt,
ratchet plane 21, and in the lift overcoming the
said folds resembling nodes and loops, said loops
force of a molecular spring located in the jaw
equivalent to waves the crests of which bring
manifold lines of sandpaper to bear on the sur
15 face to be abraded, whether the tool in use
moves in transverse, oblique or horizontal direc
ward from the tool (or section 1) and off. In
tio-ns. The idea is to multiply the cutting lines
a reverse procedure the section 2 is back again,
I2 of the mouth II ; then, third, push the sand
paper locking device known as a smouth out
locked securely to section 1.
In Figure 1 the handhold 24 known as sec
of the sandpaper indeñnitely, consuming its en
tire value available, except the remnants in the
tion three is fastened to the pair of sandpaper 20 clamps, said remnants being used later in the
miniature tools each known as an individual
locking devices Il known as section 2 which,
sandpaper locking device, Figure 2. In feather
in turn, is attached to the sandpaper matrix
known as section 1.
To remove the handheld
edging use the curved ends of the tool as a means
of avoiding too large a range of feather edging
hold of the shell at its sides, exert a lateral pres 25 with a consequent waste 0f abrasive material.
In using the guardrail of felt as a protective ap
sure on the shell until the larger ends of the
purtenance for saving strips of chrome orna
pear-shaped holes 25 swap places with the small
mentation, for example, from incautious
er semicircular ends which the molecular spring
scratches, bring the lateral side of the tool close
held tight in the troughs of the threaded bolt
ends and jam against the nuts 23. Having 30 to the ornament, press down on the tool and slide
it, tilted, close up to the ornament. Such a
brought the shell into that position, lift it off,
maneuver forces the guardrail under the sand
whereupon the molecular spring is inert. To re
paper at its edge, permitting necessary abrading
place the handhold, then, reverse the procedure;
close to the strip-_and no harm done from
that is, exert a lateral pressure on the shell,
having brought it into a position in which the 35 scratching.
Having given a detailed description of my in
composite holes 25 are above the boltends 20,
vention, supplemented by drawings, what I claim ‘
until the larger ends of the composite holes 25
are directly above, or nearly so, the boltends 20,
A device of the class described comprising a
and while in that new position above the metal
shell down and jam against the nuts 23 as in 40 body member having curved ends and being
adapted to support a strip of abrasive material,
Figure 8. Now release the molecular spring.
said body member consisting of a plurality of
Thereupon, the metal shell takes hold of section
layers of felt and narrow metal reinforcing strips
2 in a semicircular grasp and holds fast to its
interleaved between the felt layers adapted to
assigned troughs.
24 from the sandpaper locking devices II, take
In loading the tool with sandpaper I6, ilrst
remove the handhold to get at the nuts 23. Fig
ure 6 indicates that the sandpaper is loaded al
ready, but imagine that the lips I4 and I5, be
tween which the sandpaper is shown, are open.
Then above the one end of sandpaper I6 be- '
tween the lips I4 and I5 up against the bolts
20 which are called endstops, thereupon tighten
the nuts 23 slightly, relying largely on a mere
frictional engagement of the'- sandpaper with
the lips for a momentary clasp-a tenuous hold
‘ reinforce and sti?íen the felt layers, narrow side
members on each longitudinal side having right
angle beads formed at the tops thereof and ex
tending partly across the top of the body mem
ber, spring jaw member at each end of the body
member having ñange members extending be
neath the beads on the side members and clamped
to the 4body member thereby, means engaging the
jaw members to force the gripping of the jaw
members together, a pair of felt guard rails along
each longitudinal side of the body member and
extending beyond the abrasive supporting face
and after that procedure the sandpaper is brought
thereof, bolt members adjacent each end of the
to the second clasp at the opposite end of the
body member passing through the side rails and
tool, having kept the lateral edges of the paper
body securely clamping the rails and body mem
parallel to the so-called guardrail of felt while
placing the unattached end of the paper between 60 bers together and a strip of abrasive material
having each end clamped in a jaw member and
the second pair of lips I4 and I5 (endstops not
being snugly supported by the body member. f
of use here) and making the paper fast by tight
ening the nuts 23, thereafter loosening the nuts
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