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Патент USA US3091515

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May 28, 1963
Filed Aug. 29, 1960
2 Sheets-Sheet 1
U/; /
Fig. 1.
May 28, 1963
Filed Aug. 29, 1960
2 Sheets-Sheet 2
Fig. 2.
United States Patent 0
Patented May 28, 1963
An object of this invention is the provision of a hydro
magnetic system comprised of a spring-bellows assembly,
Paul Bernard Reaser, New Orleans, La.
(19901 Nordhoif, Northridge, Calif.)
Filed Aug. 29, 1960, Ser. No. 52,513
3 Claims. (Cl. 346-29)
connecting tubing and a cylinder assembly in which the
variable condition is the revolution of cams acting on a
plurality of spring-bellows assemblies and in which the
cylinder assembly is comprised of the inner piston magnet
effecting a vertical movement of plastic balls containing
steel balls by merit of magnetic flux exerted in such a
This invention relates to a system responsive to changes
way as to allow the demonstration of preselecteddynamic
in variable conditions such as weight, tension and ?uid 10 patterns.
pressure to effect a corresponding indication, recording
These and other objects or the advantages of the inven
or control action and more particularly to a novel system
employing hydraulic linkage of magnetic components.
tion will become apparent from the following speci?ca
tions when taken with the accompanying drawings. It
will be understood, however, that the drawings are for
Apparatus of the type contemplated by this invention
comprises a means for sensing and measuring changes in 15 purposes of illustration and are not to be construed as
a variable condition such as, for example, balanced lever
de?ning the scope or limits of the invention, reference
systems de?eotable in response to changes in weight
being had for the latter purpose to the claims appended
wherein a Writing or indicating pointer is mechanically
linked to said lever system, an electrical indicating instru
In the drawingswherein like reference characters de
ment having a pointer and responsive to changes in elec 20 note like parts in the several views:
trical characteristics of such components as transducers, a
FIGURE 1 is a diagrammatic view of the hydraulic and
hydraulic indicating instrument wherein -a Bourdon tube
magnetic components in an instrument embodying my
or bellows activated pointer is responsive to hydraulic
pressure changes within a closed system embodying a
FIGURE 2 is a diagrammatic view showing another em
cylinder or diaphragm de?ectable in response to changes 25 bodiment of this invention;
in weight, and, various systems employing gases or vapors
FIGURE 3 is a diagrammatic view of an arrangement
in a similar fashion.
suitable for demonstration of dynamic wave forms;
An object of this invention is the provision of a hydro
In the instrument illustrated in FIGURE 1, which is a
rnagnetic system responsive to changes in a variable condi
mechanism for sensing changes in a variable condition,
tion and which system provides a measurement, record or 30 there is shown a helical spring 11 and a metallic bellows
control of a variable condition.
12. In the present embodiment, these members are
An object of this invention is the provision of a hydro
magnetic system comprised of a spring-bellows assembly,
mechanically linked in such a way that compression of
the spring 11 results in an equal linear de?ection of the
hydraulically linked by means of tubing to a cylinder
bellows 12. There is a connecting tubing 13‘ that hydraul
assembly incorporating an inner, freely movable magnetic 35 ically links the ?uid contents of the bellows to a thin
piston and, an external circumferential magnetic member ‘ walled precision bore cylinder or tube 14, which contains
to which is attached a writing and/or indicating pointer
a ceramic magnet piston 15 suitably coated to provide
and which is dependent upon the inner magnet for move
nearly friction free movement within the cylinder 14 in
response to a volumetric change in the bellows 12 as
An object of this invention is the provision of a hydro 40 transmitted thru the connecting tubing 13.
magnetic system comprised of a spring-bellows assembly,
connecting tubing and a cylinder assembly in which the
spring-bellows assembly and necessary tubing is incorp
External to
, the cylinder 14 is a carrier magnet 16 also suitably coated
to provide nearly friction free movement responsive to
the movement of the inner magnet piston 15. The thin
orated in a housing suitable for use as a supporting struc
wall of the cylinder 14 allows the utilization of su?icient
ture, and hence a load sensing device, for platforms, bins, 45 magnetic flux to provide a ?rm linkage between these two
hoppers and tanks, and, in which the cylinder assembly is
members so that a writing pen 17 can be secured to the
housed in a suitable case with contained chart and drive
mechanism either proximate to or remote from the load
external carrier magnet 16. A suitable strip chart 18 and
drive assembly 19 is provided. The magnitude of move
supporting assembly.
ment of the magnetic members is a function of the cubic
An object of the invention is the provision of a hydro 50 volume displacement within the bellows 12. Wide ranges
magnetic system comprised of a spring-bellows assembly,
connecting tubing and a cylinder assembly in which is
incorporated a mechanically activated auxiliary bellows
of ampli?cation are possible and dependent upon the ratio
between the cross-sectional areas of the bellows 12 and the
cylinder 14.
in such a fashion as to allow adjustment of the ?uid
The spring 11 varies in spring rate according to the
volume so as to effect movement of the inner piston and 55 needs of a particular embodiment ‘from a few ounces to
associated members independently of the de?ection of the
many tons. The design of the spring is such that tem
spring-bellows assembly.
perature dependence, hysteresis and permanent set are not
An object ofvthis invention is the provision of a hydro
appreciable factors in ordinary weighing applications.
magnetic system comprised of a spring-‘bellows assembly,
From the foregoing description, it will be seen that a
connecting tubing and a cylinder assembly in which pro 60 consideration of accuracy is necessary in order to char
acterize the responsiveness of the system‘. By dead weight
vision is made for the external magnetic member to at
testing with water in a tank, supported by four such spring
tract and carry with it a steel ball in such a way that the
ball is dropped into a slot at any point by merit of vanes
that prevent their return when repetitive measurements
Ibe-llows assemblies manifolded into a single cylinder as
sembly, it can be demonstrated that the sensitivity and
are made, hence allowing the demonstration of frequency 65 the error, in terms of a Standard Deviation, are on the
order of one tenth of 1% ‘of the rated capacity. This has
distribution patterns.
been ascertained with spring rates of 1000 pounds and
An object of this invention is the provision of a hydro
magnetic system comprised of a spring-bellows assembly,
20,000 pounds.
When this invention is used as a load supporting device
connecting tubing and a cylinder assembly in which the
additional facility is provided whereby the external magnet 70 that is responsive to weight changes a protective casing 20
member is enabled to trip suitable micro-switches at one
and a supporting member 21 of suitable material are em
or more points along the length of the cylinder.
Referring to FIGURE 1 there is shown an additional
embodiment that allows zero adjustment, or in the in
stance of an application sensing a change in Weight, a
means of adjusting for tare weight. The auxiliary bel
lows 22 is mechanically linked to a screw and knob lever
23 that effects an extension or compression of the auxil
iary ‘bellows 22 resulting in a reduction or increase in the
?uid contents of the primary system thus in turn effecting
being positionally responsive to said sensing member in
accordance with the ratios of the diameters of the bellows
and the magnetic piston, means supporting said tubular
element, and an appreciable length thereof being free of
attachment, a magnetic member external and closely ad
jacent to said tubular element and magnetically coupled
to said piston for movement therewith, and a recording
element coupled to said external magnetic member.
the movement of the piston 15 within the cylinder 14
2. The invention as recited in claim 1 wherein the ex
independent of the de?ection of the primary bellows 12. 10 ternal magnetic member serves as a carrier for a small
Referring to FIGURE 2, there is shown an additional
steel ball contained within a larger non ferrous ball, a
embodiment that allows the demonstration of the fre
plurality of such systems serving to demonstrate responses
to multiple variable conditions in a pattern according to
quency distribution pattern of repetitive responses to vari
able conditions of the same type such as weight. When
the pattern of the multiple variable conditions.
3. An instrument assembly for demonstrating frequency
a variable condition is being measured the progression of 15
the carrier magnet 16 results in the movement of the ball
distribution patterns of repetitive events that can be mani
24 past the series of ‘vanes 25 separating the individual
fested by pressure, vacuum, linear displacement or tem
slots 26. The ?exibility and curvature of the vanes 25
perature by means of the expansion or contraction of a
prevent the return of the ball ‘24 so that when the meas
bellows containing a suitable liquid and connected by
ured condition is removed from the system and the car 20 suitable tubing to a precision bore cylinder containing a
rier magnet returns to zero a ball 24 ‘drops into the slot
close ?tting magnet in such a fashion that the magnet
260: at the point of furtherest progression. A sliding
is free to move horizontally in response to the contrac
member 31 allows the recovery of the balls 24 at the end
tion or expansion, thereby providing a piston, means
of a series of measurements.
whereby a small steel ball can be carried along a chan
The steel balls are made available to the magnetic in 25 nel exterior to the cylinder by the magnetic attraction
?uence of the carrier magnet 16 by means of a pivoted
of the piston magnet comprised of a series of open slots
arrangement whereby the magnetic action of said carrier
vertically arranged and separated by thin vanes that al
magnet ‘16 results in repulsion of a small magnet 30‘ caus
low the ball to be carried in one direction only when said
ing a slight rotation of the plastic disc 29 to occur thus
balls are removed from the magnetic ?eld when retro
causing a steel ball to drop from the reservoir 32 into the 30 motion occurs at the end of the piston magnet excursion,
magnetic ?eld of the carrier magnet 16.
said slots being in plurality and of sufficient length to
Referring also to FIGURE 2, there is shown an addi
allow the accumulation of a statistically signi?cant num
tional embodiment that allows various control (functions
ber of balls, said balls being capable of being removed
to be effected. The small steel vane 33 seen at the right
at the bottom for transfer to the reservoir where the
side of the diagram represents the lever arm extension of 35 balls originate, their removal from this reservoir being
a small microswitch 34 which is opened or closed by the
accomplished by the magnetic repulsion of the returning
movement of the vane 33 as the carrier magnet ‘16 causes
piston magnet against an escapement disc embodying a
its de?ection by magnetic attraction.
small magnet of similar polarity to said piston and hav
Referring to FIGURE 3, there is shown an additional
ing a pocket therein whereby a ball in a pocket of the
embodiment that allows the demonstration of predeter 40 escapement disc is caused to fall into the magnetic ?eld
mined Wave patterns of various types. A plurality of
of the piston magnet and be carried to the limit of the
cylinders 14 containing piston magnets 15 and connected
excursion and dropped into the ‘appropriate slot, said
by means of tubing 13 with its contained ?uid to the bel~
slot being covered in front by a thin transparent cover
lows assemblies 12 are arranged as closely together as is
in such a way that the array of small steel balls are
expedient. A horizontal shaft 37 on ‘which are located 45 readily visible depicting the frequency distribution pattern
removable cams 38 comprises a means of varying the
of the imparted repetitive events, said assembly being of
de?ection of the individual bellows 12 according to pre
proper size and location so as to contain the members
determined pattern dependent on cam 38 con?guration.
listed in such a fashion that the sensing bellows can be
The shaft 37 rotation can be by manual or mechanical
compressed or expanded at any appropriate location where
means not illustrated. Rotation of shaft 37 hence results 50 pressure manifestations can be imparted.
in progression of piston magnet 15 and an externally
placed plastic ball 35 containing a small steel ball 36
according to the con?guration of cam 38.
Having now described this invention in detail in ac
cordance with the requirements of the patent statutes vari— 5
ous changes and modi?cations will suggest themselves to
those skilled in the art, and it is intended that such changes
and modi?cations shall fall within the scope and spirit of
the invention, as recited in the following claims.
I claim:
1. A hydrornagnetic recording system comprising in
combination, a sensing member embodying a bellows, a
precision spring, means associating said spring with said
bellows for conjoint action therewith, said bellows and
said spring being expandible in response to changes in a 65
variable condition, a connecting tubing attached to one
end ‘of the bellows, a precision cylindrical tubular element,
said tubing connecting said bellows and said tubular ele
ment, a magnetic piston in the form of a ceramic magnet
in said element, said system being ?uid ?lled, said piston 70
References Cited in the ?le of this patent
Tata ________________ __ Aug. 13, 1889
Fulton ______________ __ Nov. 28, 1905
Arndt _______________ __ Oct. 14, 1913
Bailey ______________ __ Mar. 5, 1918
‘Cole ________________ __ Dec. 3, 1918
vBothezat et al. ________ __ Apr. 21, 1925
Durant ___, __________ __ July 14, 1931
Noble _______________ __ June 12, 1934
Chappell et al. _______ __ Apr. 20,
Hanson et al. _________ __ Jan. 9,
Hart et al. ___________ __ Sept. 7,
Traugott ____________ __ May 31,
Erbguth _____________ __ Jan. 19,
Astl _________________ __ Aug. 9,
Young et al. _________ __ Jan. 17,
McLaughlin et al. ____ __ Mar. 28,
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