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Патент USA US2112114

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March 22, 1938.
K_ D_ RAlNBoLT
2,112,114
ROOFING CALCULATOR
Filed Oct. 22, 1955
2 Sheets-Sheet l
fl: B. ?aiiz?ali
March 22, 1938.
K. D. RAINBOLT
2,112,114
ROOFING CALCULATOR
Filed 001:1 22, 1935
2 Sheets-Sheet 2
Swarm/Km.
2,112,114
Patented Mar. 22, 1938
UNITED STATES PATET
2,112,114
ROOFING CALCULATOR
Katherine D. Rainbolt, Bloomington, Ind.
Application October 22, 1935, Serial No. 46,191
1 Claim. (Cl. 33-70)
This invention relates to a device designed for
use by an operator while standing on the ground,
to accurately calculate the amount of material re
quired in covering the roof of a building.
An important object of the invention is to pro
vide a calculating gauge including a body por
tion and plumb line, the body portion having cer
tain indicia cooperating with indicia provided in
a book of charts, whereby the square feet of a.
10 roof may be readily determined.
With the foregoing and other objects in view
which will appear as the description proceeds, the
invention consists of certain novel details of con—'
struction and combinations of parts hereinafter
more fully described and pointed out in the
claim, it being understood that changes may be
made in the construction and arrangement of
parts without departing from the spirit of the in~
vention as claimed.
20v
Referring to the drawings:
Figure l is a diagrammatic view indicating the
manner in which the gauge is used.
Figure 2 is an elevational view of the gauge in
its active or extended position.
Figure 3 is a view showing the gauge in a closed
position.
Figure 4 is a sectional view taken on line 4-—4
of Figure 3.
Figure 5 is a sectional view taken on line 5—5
charts that cooperate with the gauge in complet
ing a calculation.
7
The reference character 12 designates a plumb
line which is secured to the bar 5 near the free
end thereof, the opposite end of the plumb line 5
carrying the weight I3 so that when the gauge is
in use as shown by Figure 1, and the upper edge
of the bar 5 is held so that it will aline from the
eye of the user, with one of the inclined edges of
the roof being measured, the line 12 will be 10
moved to a position where it will fall directly
over one of the letters of the elongated plate H.
One of the charts containing indicia corre
sponding with indicia of the plate H, is shown
by Figure '7 of the drawings.
'
In the use of the device the gauge is held in
a position as shown by Figure 1 of the drawings,
and it will be seen that when the gauge is in this
position, the line 12 falls over the letter H on the
plate I 1. Since the width of the building includ 20
ing the overhang is thirty feet and the length of
the building is forty feet, the chart H is consid
ered, and the column of ?gures indicated by the
numeral 30 at its upper end is considered. The
numeral in this column 30 opposite to the num 25
ber 40 in the adjacent column will give the ac
curate number of square feet in the roof.
While this is one example of the use of the cal
culator it will of course be understood that other
calculations wherein a roof having a greater or 30
of Figure 3.
Figure 6 is a fragmental elevational view of
less pitch than that shown, is to be measured, the
oneof the bars, indicating the pivoted brace bars
calculations are made in a similar manner.
of the gauge; and
Figure '7 is a view illustrating one of the charts
with which the gauge is used.
As shown, the weight I3 is connected to the
line I2, by the means of the spring l4 so that
when the gauge has been moved to its closed
Referring to the drawings in detail, the gauge
embodies a pair of bars 5 and 6 which bars are
pivotally connected at "I so that the bars may
swing with respect to each other, the free ends
40 thereof being spaced apart an appreciable dis
tance as shown by Figure 2. Connected with the
bars 5 and 6, are pivoted brace bars 8, one of the
bars having a notch 9 to engage the pin 10 car
ried by the opposite bar, so that the bars 8 will
be held against breaking, in one direction, when
the bars 5 and 6 havebeen moved to their ex
position, the weight may be moved under the
bracket I5, whereupon the tension of the spring
14 will act to hold the weight in this position.
What is claimed is:
A roof measuring instrument comprising a pair 40
of bars, means for pivotally connecting the bars,
said pivot means including a member adapted to
normally hold the bars in parallel spaced rela
tion with each other, the inner surface of one of
the bars being graduated, a plumb line secured to ‘ 1
gated plate H which is formed with suitable
graduations dividing the plate I! into spaces.
the inner surface of the opposite bar and adapted
to align with graduations on the inner surface
of the ?rst mentioned bar according to the an
gle at which the device is held while using the in
strument, and means for holding the bars in their 50
These spaces are formed with letters or indicia
extended positions.
tended positions.
Secured to the side face of the bar 6 is an elon
corresponding to letters or indicia indicating the
KATHERINE D. RAINBOLT.
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