Try Gravity Level Page: 2 of 3
This patent is part of the collection entitled: Texas Patents and was provided to The Portal to Texas History by the UNT Libraries Government Documents Department.
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Patented November 15, 1904,
UNITED
STATES
PATENT OFFICE.
JOHN A. DREW, OF ROCKLAND, TEXAS.
TRY GRAVITY-LEVEL.
SPECIFICATION forming part of Letters Patent No. 775,129, dated November 15, 1904.
Aplication filed June 11, 1904, Serial No, 212,161. (No model)To cL l w/iomn it Thiy eoncernz:
Be it known that I, JOHN A. DREW, a citizen
of the United States, residing at Rockland, in
the county of Tyler and State of Texas, have
5 invented certain new and useful Improve-
ments in rTry Gravity-Levels; and I do de-
clare the following to be a full, clear, and exact
description of the invention, such as will enable
others skilled in the art to which it appertains
'a to make and use the same, reference being
had to the accompanying drawings, and to the
figures of reference marked thereon, which
form a part of this specification.
My invention is a try gravity-level; and it
15 consists of a device whose two sides are at
right angles with each other and whose third,
side is a graduated arc of a circle, an oscillat-
ing weight actuating an indicating-finger.
The object of my invention is to produce a
20 try-level that may be carried in a carpenter's
tool-box without injury and will be ready at
all times, whether the weather be hot or cold,
wet or dry, to indicate the pitch of a piece of
timber or a plane and which may also be used
25 to lay off the pitch or incline desired to be
made on timbers or other places.
In the accompanying drawings, Figure 1 is
a front elevation of my device. Fig. 2 is a
rear elevation. Fig. 3 is a front elevation,
30 the front plate being removed. Fig. 4 is an
elevation of the rear face of the front plate.
Fig. 5 is a sectional view of Fig. 1 on the dot-
ted line a a. Fig. 6 is a sectional view of
Fig. 3 on the dotted line b b.
35 My invention is described as follows: The
numeral 1 represents the front face of the
front plate; 2, the front face of the rear plate;
3, the are of the circle, being a part of the
rear plate, said are being divided into inches
40 from one to twenty, said inches being divided
into fourths of inches. I am not, however,
confined to any particular number of inches,
and the inches may be divided into smaller
measure than one-fourth.
45 4 represents the rear face of the rear plate,
and 5 represents the rear face of the front
plate. The rear plate is provided on its in-
ner face and left-hand edge with a raised part
6, and through the plate are perforations.
50 The rear face of the front plate is also pro-vided with a raised part 6', which is also pro-
vided with perforations, by means of which
perforations the two parts are held together
by means of screws or bolts. The purpose
of these two raised parts 6 and 6' is to leave 55
a space for the indicating-finger to play in, as
shown in Fig. 5.
The inner faces of the front and rear plates
1 and 4 are provided with recesses 7 and 8,
respectively, in which recesses swings as a 6o
pendulum a weight 9. Extending from the
upper face of said weight 9 is an indicating-
finger 10. A little above the upper face of said
weight said finger is enlarged, and through
said enlargement is a perforation 11. Se- 65
cured to the inner face of the rear plate is a
spring-plate 12, its lower end passing down
partly into the recess 8 of the lower plate 4
and terminating in a perforated bearing 13.
Secured to the inner face of the front plate is 70
a spring-plate 14, its lower end passing down
partly into the recess 7 of the front plate and
terminating in a perforated bearing 15.
These two bearings are immediately opposite
each other and their perforations concentric. 75
A pin 16 passes through the perforation 15 of
plate 14, thence through the perforation 11
of the finger 10, thence through the perfora-
tion of the bearing 13 of the plate 12, and
thence into the plate 4, and thus the said 8o
weight 9 is swung between these two spring-
bearings, while its finger 10 is allowed to play
around in the space between the two plates,
the point indicating the pitch at which the
level stands. 85
The bearings are made of spring metal, so
that they will slightly impinge against the
enlarged part of the linger, so that the finger
will not drag against the inner faces of the
said plates, but be permitted to move perfectly 90
free. The rear face 4 of the rear plate is pro-
videcl with a groove 17. In this groove is se-
cured at the end 18 one end of a spring 19,
the other end of which turns down and passes
into a perforation 20 through the rear plate, 95
forming a lock 21. This lock 21 is so situated
that the finger may be locked to the left of
the arc or to the right thereof.
Running across the groove 17 is a thumb-
recess 22, whereby the said spring and lock 100Nc. 775,129.
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Reference the current page of this Patent.
Drew, John A. Try Gravity Level, patent, November 15, 1904; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth512158/m1/2/?q=%22United%20States%20-%20Texas%20-%20Tyler%20County%22: accessed May 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.