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Патент USA US3079630

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March 5, 1963
Filed March 18, 1959
United States Patent O??ce
Patented Mar. 5, 1963
so that when the plow is presented with its leading point
L in the apex of a three-sided corner of a plastered room,
Roger A. Smyers, 486 W. South St., Akron 7, Ohio;
Leonard D. Varrecchia, 837 Dan St., Akron 10, ()hio;
John R. Varrecchia, 484 W. South St., Akron 16,
and with the apex edge 14 of the plow at a substantial
angle, say about 10°35’, to the corresponding corner
apex line 17, the leading edges 15 of plow sides 11 will
‘be in position to coincide with the other two right-am
gularly disposed corner apex lines 18 and 19, as shown
in FIGURE 3.
Filed Mar. 18, 1959, Ser. No. 809,230
3 Claims. (Cl. 15——235.7)
In other words, considering the relative position of the
This invention relates to an angle plow for plasterers. 10 plow 10 shown in FIGURE 4, with the apex edge 14
Heretofore, tools referred to as plasterers’ plows and
thereof at a relatively slight angle D (see FIGURE 1)
trowels have been provided for smoothing and shaping
of 5° to the apex line 19, for example, the e?ective
wet plaster in corners de?ned by adjacent walls of a room.
wall-engaging angle between the edges 15, 15 will be
The prior tools, however, have not been satisfactory, be
90°. When, however, the plow is held at a relatively
cause they were dif?cult to operate and produced inac 15 greater angle D of 10°35’, corresponding to the angle
curate or non-uniform results, particularly in corners
A of 10°35’, the effective wall or corner-engaging angle
de?ned by three adjacent plastered surfaces. In use of
between the edges 15, 15 will be less than 90°, or 88°30’.
such prior tools, moreover, there often resulted an excess
This last-angular position of the plow is used for recess
of white plaster in the corners, which was required to
ing the brown plaster layers in the corners, in accord
be scraped out after it dried, in order to provide a smooth, 20 ance with known practice for subsequent reception of
square corner ?nish.
the white plaster layers, in a manner and for the purposes
to be described later. It will be seen, therefore, that
the angles A, C and D, cooperate to produce at least two
One object of the invention is to provide an improved
angle-forming tool for plasterers, which can be used with
ya. minimum of manual effort to square the plastered
predetermined plaster-forming angles, depending upon
corners, accurately, and in a manner which eliminates the 25 the angle D maintained during plaster-forming strokes.
aforementioned scraping operation after the plaster has
To a certain extent, other accurately predetermined com
binations of angles A, C and D may be utilized to pro
Another object of the invention is to provide an angle
duce substantially similar results, but the speci?c angles
plow which will reach to the full extent of the apex
set forth above have been found to produce satisfactorily
of three right-angularly disposed wall surfaces, and in 30 accurate results.
In use of the improved plow, for angle shaping plas
cluding substantial extents of the two corner portions de
?ned by the adjacent right angularly disposed surfaces.
tered corners, it may be started with the point L of the
plow in the ceiling corner apex as shown in FIGURE 3,
for example, while the plow is held at said angle D of
These and other objects of the invention will be mani
fest from the following brief description and the accom
panying drawings.
10°35’, initially to make the leading edges 15, 15 coin
of the accompanying drawings:
cide with the two corner lines 18 and 19.
FIGURE 1 is a side elevation, on a reduced scale, of
of the usual white plaster coat the plow is manipulated
from this position downwardly to shape the corner sub
stantially to an 88°30’ angle. As the plow is drawn
‘an angle plow embodying the features of the invention.
FIGURE 2 is an end elevation as viewed from the left
of FIGURE 1.
FIGURE 3 is a perspective view, illustrating the man
ner in which the plow reaches the apex of three right
angularly disposed wall surfaces and including substan
In the case
downwardly in this angular relationship accomplished by
inward pressure on the handle 13, the angle D toward
corner line 20 may be lessened to approximately 5° (see
relative position of FIGURE 4), whereby the effective
tial extents of the two adjacent corner apex lines.
angle formed between the two adjacent wall surfaces, by
FIGURE 4 is a similar perspective view, on a larger 45 the edges 15, 15, will be increased to 90°. In other
scale, illustrating use of the tool for shaping a plastered
words, the combination of the angles A and C are effec
corner portion between two right angularly disposed wall
tive to produce a wall angle of 90° when handle 13 is
held and moved at a convenient and comfortable angle.
Referring to FIGURES 1 to 4 in general, and to FIG
Moreover, as best shown in FIGURE 1, because the vec
URES 1 and 2 in particular, the numeral 10 designates 50 tor focal point P of the axis of handle 13 is ahead of the
an angle plow formed V-shaped from a sheet of thin,
point L of the plow, a mechanical advantage is gained
relatively rigid, but somewhat springy material, such as
to apply a greater degree of pressure at point L than
stainless steel approximately .024 inch thick, for exam
would result if point P were the same as point L. Ac
ple. The two ?at sides 11, 11 of the plow may ‘be in
cordingly, the plow is operable for smoothly forming
planes at an angle C slightly greater than 90°, such as 55 corners with a minimum of effort. All corner angles
90°30’, for a purpose to be described. The given an
may be similarly formed.
gle C is maintained by means of a triangular shaped
In the case of the usual previously applied brown plas
back 12 of the same material, formed with opposite
coat, upon which the white plaster is applied, as de
?anges 13a, 13a, which are attached to the plow sides
11, by welding or other means. A handle or hand grip 60 scribed above, the plow is held at the relatively greater
angle D of 10°30’ for forming shallow recesses in the
13, is attached to the back 12, in a manner to provide a
wall surfaces adjacent the apex formed by three wall
tool which requires a minimum of manual effort to use.
surfaces, through reduction of the effective angle between
Accordingly, the back 12 is arranged at a forwardly and
the edges 15, 15 to 88°30’, as described above. When
outwardly inclined angle B of 10°35’ to the apex edge
14 of the plow sides 11, so that the axis of the hand 65 the white plaster is applied in the recessed corner por
grip intersects the extension of an imaginary line through
tions the normal tendency for the same to leave pro
apex edge 14, at a point P substantially in advance of
truding portions when the plaster hardens will be obvi
the leading point L of the plow (see FIGURE 1).
ated, and no scraping will be necessary to provide smooth
Straight leading edges 15, 15 of the plow sides 11 are
accurately angled surfaces.
arranged to lie within a plane which is at a rearwardly
Modi?cation of the invention may be resorted to with
and outwardly inclined angle A, such as 10°35’, to a
out departing from the spirit thereof or the scope of
plane at right angles and normal to said apex edge 14,
the appended claims.
spect to said apex edge of the body to a focal point on
What is claimed ‘is:
an imaginary line extension 9f said apex edgssubsianr
,l- A plastererfs angle P19W f9; farming inside acorner
tially forwardly of the body-to minimize the amount of
manual etfort required to operate the plow for forming
the plaster, the space between said ?at sides being free
angles in angula-rly disposed plastered walls de?ning cor
nering apex lines, comprising a body formed of rela
tively thin sheet ‘material to have opposite ?at sides ex:
tending laterally V-shaped at a uniform given angle from
an apex edge thereof and having straight forward and
and unobstructed.
2. An angle plow as set forth in claim 1, said angle of
said rearwardly. and outwardly inclined plane approxi
rear edges, a substantially ?at back plate: rigidly 'af?xed
a?ixed onsaid
and a hand
the rear
side thereof, said straight forward edges of said sides ‘be
mating 10°-3,5'.
ing within a plane rearwardly and outwardly inclined
from said apex edge, and the plane of said back plate
V the walls, said handv grip having an axis thereof nerrnal
to the plane‘olf said back plate and conyergin'gwith, re
said forwardly and outwardly inclined planeof the back
plate ‘being 10°35’.
References Cited in the ?le of this vpatent
rbeing forwardly and outwardly inclined from said apex
edge, said given angle being slightly greater than 90°
and bearing a relationship to said rearwardly and’ out
wardl-y inclined plane whereby said body is adapted to
be held at di?erent angles with respect to said angularly
disposed walls to vary the‘ effective angle between said
forward edges in relation-to the cornering apex lines of
3. An angle plow as set forth in claim '2, the angleof
Streeter _.._>____,__,__..__,_ Nov. 8_, 1870
' 1,321,532
Campbell ____________ __ ‘Mar. 18,‘ 1919
Mann ______________ __'Nov. 11, 1919
-S‘chrepper _., __________ __ Sept. -2, 1952
Schields _..___. _____ _,_..__.. Nov‘. 4,‘ 1952
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