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Патент USA US2404601

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July 23, 1946.
w_ c_ SEYTER
2,404,601
MI CRO BALANCE
Filed May'24, 1944
2 Sheets-Sheet 1
July 23, 1946. Y
2,404,601
W. C. SEYTER
MI CRO BALANCE
Filed May 24, 1944
2 Sheets-Sheet 2
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BY
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2,404,001
Patented July 23, 1946
UNITED STATES PATENT OFFICE
2,404,601
MICROBALANCE
William Christopher Seyter, Union City, N. J ., as
signor to The Torsion Balance 00., New York,
N. Y., a corporation of New York
Application May 24, 1944, Serial No. 537,058
8 Claims. (Cl. 265—~54)
2
1
shown) extending outwardly at the front of the
My present invention relates to balances, and
case below the base thereof, the function of the
lift rod being to move arrestment means for the
more particularly to micro balances and aims to
provide certain improvements therein.
beam and the stirrups into and out of operative
position. Rigidly mounted on the top of the col
Among the objects of the present invention are
(l) to provide a micro balance wherein the stir
umn is a block I2 having mounted in its top a
rup and the beam arrestment contacts are so ad~
central bearing consisting of an inset piece I3
justed that in releasing said arrestment means,
of agate, boron carbide or other extremely hard
the knife edges for supporting the stirrups will
material having a highly polished plane top sur—
seat-before the central knife edge of the beam;
(2) wherein lateral tilting of the stirrups is pre~ 10 face for supporting the central knife edge I4 of
a balance beam I5. Secured to the block I2 are
vented when the pans supported by the stirrups
a pair of arms I6 in which are ?xed aligned pivot
are being loaded or unloaded; (3) wherein springs
pins I1 upon which are pivotally mounted 9. pair
are'provided to insure lowering of the arrest
of oppositely disposed Y-shaped beam arrest
ment arms for both the beam and the stirrups
ment arms I8 and a pair of oppositely disposed
when the lift rod controlling said arms is low
Y-shaped stirrup arrestment arms I9 having
ered; (4) wherein perfect placement of the rider
fork-shaped end pieces I9’. Preferably the axis
of the pivot pins ll lie in the top plane surface
of the bearing member I3. The balance beam
for facilitating such rider placement and the
reading of the rider position on the beam; and 20 I5, which may be of any desired form, carries ad
on
sidewise;
the beam
(5) will
wherein
be obtained
index means
both are
endwise
provided
jacent each of its ends an upwardly-directed
(6) wherein the construction is less complicated
and more easily adjusted in consonance with the
extreme accuracy of the balance so that less time
knife edge 20, and preferably the bearing edges
of the knife edges I 4 and 20 all lie in a common
plane. Adapted to be seatably supported upon
will be required for making adjustments.
The foregoing and other objects of my inven
it an
tion not speci?cally enumerated, I accomplish
by the novel construction and cooperative ar
rangements of parts hereinafter described and
illustrated in the accompanying drawings show
ing a preferred embodiment, and wherein:
Figure 1 is a front elevation of the upper por
tion of a micro balance embodying the novel fea
tures of my invention, parts thereof being broken
the terminal knife edges 20 when the balance
beam is supported on its central knife edge are
a pair of stirrups 2! each comprising a rigidly
depending cradle 22 which, in turn, dependingly
supports
a > double
hook-shaped
member
23
through an intermediate link 23a. The hook
shaped members 23 are adapted to support the
bows 24 of balance pans (not shown).
The balance beam I5 is adapted to be held in
away to better illustrate the construction, the en
closing case and the optical devices for reading “
arrested position, that is, with its central knife
edge raised out of contact with the bearing I3
the swings of the index being omitted.
Fig. 2 is a top plan view of the balance beam
with the stirrups mounted thereon.
by arrestment means herein shown as consist
ing of a ball-shaped member 25 carried by an ad
justable screw mounted adjacent one end of one
of the beam arrestment arms I8 for cooperative
engagement with a downwardly directed cup
shaped member 26 carried by the beam, and by
a pair of adjustable screws 21 carried by the
other beam arrestment arm I8 for cooperative
engagement with a transverse bar 28 carried by
the beam. These beam arrestment means may
be of a type well known in the art and more de
tailed description thereof is not thought neces
sary. The stirrup arrestment means consist of
a pair of upwardly-extending adjustable screws
Fig. 3 is an end elevation of the balance beam
as viewed from the left end thereof, with the ».
stirrups held in arrested position.
Fig. 4 is a section taken substantially along
the plane of the line 4-4 of Fig. 1.
Fig. 5 is a detail section taken along the plane
of the line 5——5 of Fig. 4.
Figs. 6 and 7 are side elevations of modi?ed
forms of rider lifters.
Fig. 8 is a section taken along the plane of the
line 8-8 of Fig. 7.
Referring to the drawings, let the reference 50 29. carried by each of the fork-shaped end pieces
IS’ on the stirrup arrestment arms I9, the free
character I0 indicate a vertical hollow column
end of one of said screws being adapted for co
such as is usually mounted on the base of an
operation with a downwardly-directed cup
enclosed balance. and guided Within the column
shaped element 30 carried by the stirrup and the
fOr vertical reciprocation therein is a lift rod II
which is usually operated by a thumb wheel (not 55 free end of the other screw being adapted for
3
4
cooperation with an inverted V-shaped groove
member 3i carried by the stirrup. These stirrup
3!, by adjustably mounting on each of the stir
rup arrestment screws 29 facing the front of the
arrestment means likewise are of a type well
balance a support 43a carrying a pair of upward
known in the art, and further description there
ly-extending adjustable screws £33 ?anking said
stirrup arrestment screw .29 and providing the
stirrup with laterally-extending ?ns 154 in overly
of is not thought necessary.
According to my present invention, the arrest
ment and the seating of the beam and the arrest
ment and seating of the stirrups are made to
take place in a time sequential order, that is to
ing relation to the screws (t3, the said screws be
ing s0 adjusted in relation to the fins that in the
normal arrested position of the stirrups as shown
say, when the arrestment means are released, the ll) in the drawings, the free ends of the screws will
stirrups will ?rst simultaneously seat upon the
be closely spaced but in non-supporting relation
terminal knife edges of the beam and at a short
' to said ?ns.
interval thereafter the central knife edge of the
beam will seat upon its bearing 53. This sequen
tial timed seating of the stirrups and‘the beam is
accomplished by employing the separate and in~
dependently operable beam arrestment arms I3
and stirrup arrestment arms 19 and by causing
said arms to move at different rates by operation
of the lift rod ll. This sequential timed move
ment is brought about by connecting the lift rod
I I to the arrestment arms l8 and l 5} through ad
justable connecting rods 32 and 33, respectively,
one end of each of said rods 32 being pivotally
connected to a depending lug lta on one of the
arrestment arms is and one end of each of said
rods 33 being pivotally connected to a depending
lug I?a on one of the arrestment arms l9, and lo
My present invention also contemplates the
provision cit‘ means whereby perfect placement of
the rider on the beam will be obtained, both end
wise and sidewise, and wherein means are pro
vided for facilitating such rider placement and
the reading of the rider position on the beam. To
accomplish this I provide a rider carrier 155 which
is mounted for movement, both longitudinally
and ver ically of the beam. in any approved man
ner.
herein shown, the rider carrier 45 is ?x
edly mounted on a carrier rod :26 which is guided
along space rods 0,? to move parallel to the beam,
said carrier rod also being rotatable about its
Mounted on said rider carrier is a vertical
ly--disposed tubular guiding member :18 within
which is vertically and nomrotatably movable a
plunger
which, at its lower end, carries a rider
rods 33 and the stirrup arrestment arms it at a 30 lifter 58. Vertical movement is imparted to the
somewhat shorter distance from the pivotal
plunger
through a connecting arm 5i, one end
mounting of said arms with the axis of the pins
of which is ?xedly mounted on the carrier rod 46
l7 than the pivotal connections 35 between the
and the opposite end of which is forked and strad
rods 32 and the beam arrestment arms l8. In
dles the ends of a projecting .pin 52 mounted on
view of the disposition of the free ends of the
‘the plunger as and extending through vertical
arms l8 above the arms l9, the latter have open
slots 53 in the tubular guiding member 48.
ings 19b therein through which the lugs ‘i811 ex
The rider lifter 5%] comprises a pair of spaced
tend and are movable. To transmit the motion of
arms 5d, the free ends of which have reentrant
the lift rod l i to the respective arrestment arms
portions 55, the free ends of which, in turn, are
I3 and I9 through the rods 82 and 33, the other 40 formed with notched aligned rider-supporting
ends of said rods are pivotally mounted to a hori
seats 5%. The rider lifter is intended for coop
zontal‘ar-m 36 of a cross-shaped member 31 which
eration with a rider 5'5 which is in the form of
is rigidly secured to the lift rod H by screws 38
a straight piece of wire of circular cross-section,
or equivalent means. Inasmuch as the lift rod 1 l
the leng n of said rider being such as to extend
45
is mounted to move within the column If] and the
across and project a slight distance on either side
arm 36 must move therewith, the column is
of the beam so as to be supportable in the seats
formed with laterally aligned slots 39 to permit
?ll of the rider lifter when raised above the beam
of such movement. To insure against any stick
and to be seated on the beam when the rider lifter
ing or lagging in the movement of the arrest
is moved below the top of the beam. In this con
ment arms when the lift rod is lowered, I provide 50 nection it will be obvious that the transverse dis
pairs of springs All for bearing upon the stirrup
tance between the reentrant ends of the rider
arrestment arms l9 and pairs of springs M for
arms is slightly greater than the depth of ‘the
bearing upon the beam arrestment arms IIB.
beam. so that in the vertical movement of said
These springs may be of any desired form and
rider lifter the arms will straddle the beam. The
may be mounted in any convenient manner, and 65 top of the balance beam is preferably transverse
are herein shown as leaf-springs suitably bent
ly notched, as indicated at 58. to accommodate
and rigidly secured to the top of the column by
the rider, each notch indicating a predetermined
fastening screws 42.
'
weight when the rider is mounted therein. For
In the loading and the unloading of the pans of
facilitating the placement of the rider in any par
the conventional analytical or chemical balance 60 ticular notch, the rider lifter is preferably formed
there is always danger of causing a lateral tilt
with an index pointer 59;: for aiding in indexing
ing of the stirrups, so that when they are brought
the notch on the beam with the rider when sup
down into seating engagement upon the termi
ported by the rider carrier. It will be observed,
nal knife edges of the balance beam, such tilted
however, that when the rider lifter has deposited
stirrups will introduce an error in the weighing 65 the rider in a particular notch, that the arms of
operation because of the change in the effective
the rider would ordinarily obscure the rider from
lengths of the balance beam arms between the
the view of the analyst, and to remedy this con
central knife edge support and the offset sup
dition the rider arm facing the front of the bal
ports of the stirrup-s, To overcome this source of
ance case may be formed of transparent mate
error, which, if inherent in micro balances, would. 70 rial such as “Lucite” or the like. The indexing
constitute a major error, I provide means where
and placement of the rider on the beam may be
in such lateral tilting of the stirrups is prevented
further expedited by the use of a magnifying
when the pans are being loaded and unloaded.
lens 59 adjustably carried by the rider carrier 45
This I accomplish by supplementing the con
on an arm iii extending therefrom.
ventional stirrup arrestment means 29, 3B and
In Figs. 6, 7 and 8 I have illustrated alternative
cating the pivotal connections 34 between the
2,404,601
5
taneously seat the stirrups and to thereafter seat
forms of rider lifters whereby indexing of a notch
the central knife edge of the beam.
on the beam for placement of the rider therein
3. A balance comprising a column, a lift rod
and for reading such position of the rider on the
guided by said column, a balance beam having a
beam can be accomplished. In each of the mod
i?cations the rider lifter comprises a pair of spaced U! central seatable knife edge and terminal knife
edges, stirrups seatable on said terminal knife
reversely L-shaped arms 52 adapted in the ver“
edges, independently movable arms pivotally
tical movement thereof to straddle the beam. In
mounted on a common axis for arrestment of
Fig. 6 the horizontal arms of the Us are each
the beam and the stirrups, and rods of adjustable
formed with a rider-supporting seat 63, and the
arm facing the front of the balance is also pro 10 length connecting said lift rod with said arms, the
connection of the rods with the stirrup arrest
vided with an index 64. In Figs. 7 and 8 the rider
ment arms being at a shorter distance from the
supporting seats are formed at the ends of re
pivotal mounting of said arms than the con
entrant lips 55 on the horizontal arms of the Us,
nec- ‘on of the rods with the beam arrestment
and the arm facing the front of the balance is
formed with indexes 66 and 61, the former being 15 arms for moving their respective arrestment arms
sequentialiy, to ?rst simultaneously seat the stir
for the purpose of indexing the notch on the
rups and to thereafter seat the central knife edge
beam for placement of the rider, and the index
of the beam.
61 being for assisting in reading the position of
4. A balance comprising a balance beam having
the rider when deposited on the beam.
terminal knife edges, stirrups seatable on said
The balance construction hereinbefore de
knife edges, means for arrestment of the stirrups
scribed, it will be understood, is intended to be
comprising arrestment levers and cooperating
housed within an enclosing case (not shown), and
means on said levers and on the stirrups and
in view of the extreme accuracy of the balance
means for preventing lateral tilting of the stir
such enclosing case may be provided with optical
rups as the pans are being loaded and unloaded,
means for facilitating the reading of the grad
said last mentioned means comprising supple
uations on an index member (not shown) carried
mental cooperating means on the arrestment lever
by the depending movable pointer 68 carried by
and on the stirrups.
the beam l5, and counterbalanced to adjust the
5. A balance comprising a balance beam having
center of gravity of the beam by the adjustable
30 terminal knife edges, stirrups seatable on said
nut 69.
knife edges, means for arrestment of the stir
In use the balance may be operated or manip
ulated in precisely the same manner as conven
tional analytical and micro balances, the funda
mental distinctions between the present inven
tion and prior balance constructions residing (1),
in the timed sequential order in Which the stir
rups are seated on the terminal knife edges of
rups comprising arrestment levers and means on
said levers and the stirrups, and means for pre
venting lateral tilting of the stirrups as the pans
are being loaded and unloaded, said last men~
tioned means comprising a pair of adjustable
screws extending upwardly on each arrestment
seated on its bearing upon release of the respec
lever ?anking and supplemental to the means
for arrestment of the stirrups, said screws being
rod with the respective arrestment arms for mov
edges, pivotally mounted independently movable
ing them sequentially, to ?rst simultaneously seat
arms for arrestment of the beam and the stir
rups, means connecting the lift rod with the
arrestment arms, means for operatively releasing
said arrestment arms by operation of the lift rod
the beam and the central knife edge is thereafter
tive arrestment arms; (2) wherein the lateral tilt 40 adapted for engagement with laterally extending
contact ?ns on the stirrups.
ing of the stirrups is prevented when the pans
6. A balance according to claim 5 wherein the
supported by the stirrups are being loaded and
ends of the adjustable screws are closely spaced
unloaded; and (3) wherein perfect placement of
but normally in non-supporting relation to the
the rider on the beam is facilitated, as is also the
reading of the position of the rider on the beam. 45 contact ?ns on the stirrup.
7. A balance comprising a balance beam hav
While in the foregoing description I have ex
ing a seatable central knife edge and terminal
plained the preferred embodiment of my inven
knife edges, stirrups seatable on said terminal
tion, it is to be understood, however, that I do
knife edges, pivotally mounted independently
not wish to be limited to the precise details of
construction disclosed since these may be varied 50 movable arms for arrestment of the beam and
the stirrups, means for operatively releasing said
within the range of engineering skil1 without de
arrestment arms to permit the seating of the
parting from the spirit of my invention as de?ned
respective knife edges in timed sequential order,
in the appended claims.
and spring means acting on said arrestment arms
What I claim is:
to insure their independent releasing movement
1. A balance comprising a column, a lift rod
upon operation of the releasing means.
guided by said column, a balance beam having a
8. A balance comprising a column, a lift rod
central seatable knife edge and terminal knife
guided by said column, a balance beam having
edges, stirrups seatable on said terminal knife
a seatable central knife edge and terminal knife
edges, beam arrestment arms, stirrup arrestment
arms, and adjustable means connecting said lift 60 edges, stirrups seatable on said terminal knife
the stirrups and to thereafter seat the central
knife edge of the beam.
2, A balance comprising a column, a lift rod
guided by said column, a, balance beam having
a central seatable knife edge and terminal knife
edges, stirrups seatable on said terminal knife
to permit the seating of the respective knife edges
in timed sequential order and spring means
mounted on the column and bearing on said
arrestment arms to insure their independent re
edges, beam arresting arms, stirrup arresting
arms, and rods of adjustable length connecting 70 leasing movement upon operation of the lift rod.
said lift rod with said arms for independently
moving said arms subsequentially, to ?rst simul
WILLIAM CHRISTOPHER SEYTER.
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