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Патент USA US2112113

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March 22, 1938.
K. RABE
DRAWING‘ INSTRUMENT
Filed Jan. 31, 1935
- 2,112,113
Patented Mar. 22, 1938
2,112,113
‘NITED STATES PATENT OFFICE
2,112,113
DRAWING INSTRUMENT
Karl Rabe, Stuttgart, Germany, assignor to
Adolf Rosenberger, Paris, France
Application January 31, 1935, Serial No. 4,382
In Germany February 15, 1934
9 Claims.
(01. 334%)
This invention relates to improvements in
drawing instruments and has for an object the
provision of an instrument which may be used
alternately as avdrawing instrument and- as a
5
planimeter.
‘
It has hitherto been necessary when measuring
areas, such as are necessary, for example, for
calculating the weight of constructional and ma
chine parts, to remove the drawing, to place it
10 on a horizontal support and, ?nally, to carry out
the measurement of the area by means of a
special measuring device. This procedure has
been found very complicated and time consuming
be adjusted about the middle point M of the
drawing head 5. The measuring device of a
polarplanimeter may be suitably mounted on the
arm 2 by means of a sleeve ‘I.
make it possible to carry out such measurements
of area on any drawing-board, that is also on
vertical or inclined drawing-boards by means of
the drawing device. For this purpose the meas
uring device, of. a polarplanimeter is rotatably
25 mounted on the guiding arms connected with the
drawing head of the drawing instrument, so as to
be brought into the operative position by means
of a simple handle.
Since the drawing head is
guided exactly parallel, any desired point thereof,
or of the setsquare connected therewith, can be
chosen as the starting point for travelling round
the boundary of the area.
This has the advan
The sleeve ‘I car
the arm 2 and can be ?xed by means of a catch.
The latter may consist of a conical pin I6 which
is forced into the borings I8 of the arm 2 under
the action of a previously tensioned spring H.
The pin It can be lifted against the spring pres
sure by means of a knob I9.
In the operating
position the wheel I2 rolls and slides on the 0
drawing surface 2|]. The borings I8 are dis
tributed at de?nite distances on the arm 2.
tage that all surfaces, even the largest which
For carrying out the measurement for example,
have to be measured, can be dealt with in one
operation without removing the drawing or in
the zero point of the graduations of one arm 6
terrupting the drawing operation. The planime
ter constant can be freely chosen by changing
the location of the tracing point to appropriate
positions upon one of the guiding links 2, 2', or
In order
to assure that the running wheel of the planime
ter will not pass off the drawing surface the
planimeter head may be mounted adjustably with
40 upon some member carried thereby.
respect to the guiding links 2, 2’.
A constructional example of the arrangement
is illustrated in detail in the accompanying draw
ing, in which:
Figure 1 is an elevation of the parallelogram
drawing instrument;
50
the guiding ring 4‘ by means of suitable pivot
‘means. The thrust arms 2, 2' are each hinged
at one end to the intermediate member'lI and
at the other end to a connecting link member
such as the drawing head 5. The drawing head
5 carries a drawing instrument such as the set—
square 6 which is graduated and can preferably 10
ries, by means of short arms 8, the bearing eyes 15
9, III for the measuring shaft II. The running
wheel I2 is connected with the measuring shaft
II in a known manner and the counting disc I4
is connected through an angle drive I3. On the
bearing I I] there is connected the Vernier disc
20
I5, the graduations of which are made the same
as those of the running wheel I2. The sleeve 1
is rotatably and longitudinally displaceable on
tion of the measuring device could not be avoided.
45
arranged in series. The rotating links I, I’ are
each connected at one end to the block 3 and ‘at
the other end with an intermediate link such as
sary while the constructional parts are being
developed and, therefore, repeated ?xing on and
The arrangement, according to the invention, will
30
ED
because such measurements of area are neces
removing of the drawing and repeated applica
20
HHS
Figure 2 is an elevation of themeasuring device
seen in the direction R; and
Figure 3 is a section through the measuring.
device on the line III--III of Figure 2.
The parallelogram drawing device consists of
55 two parallel guiding links or arms I, I’ and 2, 2'
'of the setsquare is set to the starting point 0
of the outline K of the area and is caused to travel
round the outline in any direction. The hand
rests lightly on the drawing head 5 in order to
cause the wheel I2 to move. The result is read
off in a known manner from the counting disc I4 40
and the divisions of the wheel I2. The area of
the surface is obtained from the di?erence be
tween the values read off before and after travel
ling round the curve K and after multiplying it
with the constant. When the measurement is
ended the pin I6 is lifted from the catch by means
of the knob I9 and the measuring device is turned
upwards through an angle of a, so as to be put
out of operation in order not to interfere with
further work on the drawing. If desired, the
measuring device may be moved along the arm
2 towards the ring 4 and brought into the opera
tive position at this point. Care must of course
be taken that the wheel I2 always runs on the
drawing surface 20. The setsquare 6 is preferably
2
’
2,112,113
4. In an instrument of the type described
made of transparent material in order to make
it possible to travel round the outline K of the
adapted for use in connection with a plane sur
area in either direction.
face, a support adapted for attachment in ?xed
relation to said surface, an intermediate member,
a pair of arms each pivotally attached at one end
to said support and at the other end to said in
termediate member, a connecting member, a pair
of links each pivotally attached at one end to
said intermediate member and at the other end
to said connecting member, and a planimeter 10
running Wheel supported by one of said links in
position to operate upon said surface, the means
for supporting said planimeter running wheel
In Fig. l the ?rst graduation on the horizontal
scale of the drawing head or setsquare is shown
as used for the tracing point for measuring areas
but since the head 5 and any member attached to
it moves parallel to its original position, it is
obvious that any point on head 5 or any point on
any member attached to head 5 may be taken as
the tracing point.
The invention is not restricted to this con
structional example. The measuring device may
be connected with both parts 2, 2’ by means of
1.) a coupling rod which, of course, would have to be
pivoted in such a manner as not to interfere with
the parallel» guiding. The measuring device can
14)
upon one of said links comprising a frame formed
with bearings for said wheel and with means for 15
pivotally attaching said frame to the supporting
link so that the running wheel may be moved
be resiliently arranged on the arm 2 in order to away from said surface when not in use.
keep the presure of the wheel l2 on the drawing 1
5. In an instrument of the type described
in O surface 20 as nearly as possible constant and in
adapted for use in connection with a plane sur
this way save the wheel I2. Instead of the catch face, a support adapted for attachment in ?xed
illustrated, any other may be used. Other con
relation to said surface, an intermediate member,
structions, of the measuring device or of the draw
a pair of arms each pivotally attached at one end
ing instrument also fall within the scope of the to said support and at the other end to said in
invention in so far as these parts can be com
termediate member, a connecting member, a pair
bined in a similar manner with useful results.
of links each pivotally attached at one end to said
What I claim is:
intermediate member and at the other end to said
1. In an instrument of the type described connecting member, and a planimeter running
adapted for use in connection with a plane sur
wheel supported by one of said links in position
face, a support adapted for attachment in ?xed to operate upon said surface, the means for sup 30
relation to said surface, an intermediate mem
porting said planimeter running wheel upon one
ber, a pair of parallel arms of equal length each of said links comprising a frame formed with
pivotally attached at one end to said support bearings for said Wheel and with clamping means.
and at the other end to said intermediate mem
so constructed and arranged that the frame may
ber, a link connecting member, a pair of parallel be held in various positions of adjustment rela CO s-l
links of equal length each pivotally attached at tive to said surface and relative to said inter
one end to said intermediate member, said link mediate member.
connecting member including tracing means
6.,In an instrument of the type described
adapted to be guided around the periphery of an adapted for use in connection with a plane sur
40 area to be measured, and a planimeter running
face, a support adapted for attachment in ?xed
wheel supported by one of said links in position to relation to said surface, an intermediate mem
operate upon said surface. ‘
ber, a pair of arms each pivotally attached at one
2. In an instrument of the type described
end to said support and at the other end to said
adapted for use in connection with a plane sur
intermediate member, a connecting member, a
45 face, a support adapted for attachment in ?xed
pair of links each pivotally attached at one end to
relation to said surface, an intermediate member, said intermediate member and at the other end
a pair of arms each pivotally attached at one end to said connecting member, and a planimeter
to said support and at the other end to said in
running wheel supported by one of said links in
termediate member, a link connecting member, position to operate upon said surface, the means
50 a pair of links each pivotally attached at one end
for supporting said planimeter wheel upon one of
to said intermediate member and at the other end said links comprising a frame formed with bear
to said link connecting member, and a. plani
ings for said wheel and formed with a passage
meter running wheel supported by one of said through which said supporting link passes.
links in position to operate upon said surface,
7. In an instrument of the type described
the means for supporting said planimeter run
adapted for use in connection with a plane sur- '
ning wheel upon one of said links comprising a
face, a support adapted for attachment in ?xed
frame formed with bearings for said wheel and relation to said surface, an intermediate member,
. with means for attaching said frame to the sup
a pair of arms each pivotally attached at one end
porting link at different distances from the in
to said support and at the other end to said in
termediate member.
termediate member, a connecting member, a GD
3. In an instrument of the type described pair of links each pivotally attached at one end
adapted for use in connection with a plane sur
to said intermediate member andat the other
face, a support adapted for attachment in ?xed end to said connecting member, and a planimeter
relation to said surface, an intermediate mem
running wheel supported by one of said links in
65 ber, a pair of arms each pivotally attached at one
position to operate upon said surface, the means
end to said support and at the other end to said for supporting said planimeter Wheel upon one of
intermediate member, a connecting member, a said links comprising a frame formed with bear
pair of links each pivotally attached at one end ings for said wheel and formed with means for
to said intermediate member and at the other end pivotally and slidably attaching said frame to
70 to said connecting member, said link connecting said supporting link.
member including tracing means adapted to be
8. In an instrument of the type described
guided around the periphery of an area to be adapted for use in connection with a plane sur
measured, and a planimeter running wheel sup
face, a support adapted for attachment in ?xed
ported by one of saidlinks in position to operate relation to said, surface, an intermediate mem
75 upon said surface.
ber, a pair of arms each pivotally attached at one
3
2,112,113
end to said intermediate member, a link pivotally
face, a support adapted for attachment in ?xed
attached at one end to said intermediate mem
relation to said surface, an intermediate mem
bar, a pair of arms each pivotally attached at one
her, and a planimeter running wheel supported
upon said link in position to operate upon said
surface, the means for supporting said plani
meter running wheel from said link comprising a
frame formed with bearings for said Wheel and
with means for pivotally attaching said frame to
the supporting link so that the running Wheel
10 may be moved away from said surface When not
in use.
.
9. In an instrument of the type described
adapted for use in connection with a plane sur
end to said support and at the other end to said
intermediate member, a link pivotally‘ attached
at one end to said intermediate member, a plani
meter running Wheel supported upon said link in
position to operate upon said surface, and trac
ing point means adapted to be guided around the
periphery of an area to be measured by said plani- 10
meter carried by the said link.
KARL RABE.
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