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Feb. 14, 1950
' c. H. KEAN
2,497,172 '
IEANS FOR/MOUNTING ELONGATED IAGNETOSTRICTIVE ELEMENTS
Filed Sept. 27, 1947 -
28
23
émr/
BY
INVENTOR.
408» C.
AGENT.
Patented Feb. 14, 1950
2,497,172
UNITED STATES PATENT OFFICE
2,497,172
MEANS FOR MOUNTING ELONGATED
MAGNETOSTRICTIVE ELEMENTS
Clare H. Kean, Houston, Tex., assignor, by. mesne
assignments, to Standard Oil Development
Company, Elizabeth, N. J., a corporation of
Delaware
Application September 27, 1947, Serial No. 776,549
- 3 Claims.
(Cl. 171-209)
The present invention is directed to a mount
ing means for magnetostrictive devices. More
particularly, the invention is directed to a mount- .
2
ring wedge member for the mounting means of
my invention;
Fig. 5 is a sectional view along the line V-V
of Fig. 4; and
ing means for elongated magnetostrictive ele
ments adapted to well logging devices.
It is known to generate constant frequency
magnetostrictive well logging device employing
sound waves by exciting a bar or tube of mag
the mounting means of my invention.
netrostrictive metal by passing an alternating
Fig. 6 is an elevation, partly in section, of a
Turning ?rst to Fig. 1, the numeral ll desig
current through a solenoid electro-mechanically
nates an elongated magnetostrictive element
coupled to the bar or tube. It is also known to 10 which may be a bar or tube of rectilinear or cir
control the frequency of alternating current by
cular cross section. For purposes of description
means of one or more solenoids electro-mechani
herein, it will be assumed that magnetostrictive
cally coupled to a bar or tube of magnetostrictive
element Ii is a tube of magnetostrictive material
metal and electrically connected to an electron
having a circular cross section.
tube or other suitable oscillator network. In each 15
In a preferred embodiment of my invention, a
of these methods it is conventional to suspend
an elongated magnetostrictive element, generally
ring wedge member I2 is secured coaxlally around
element II at a medial position between the ends
in a horizontal position, on a knife edge at a
thereof. Wedge member I! may be suitably se
position midway between the ends of the mag
cured to element II by welding or by silver
netostrictive element.
’
20 soldering at points designated by l3. It will be
I have found that an elongated magnetostric
understood that wedge member I! may be of any
tive element such as a bar or tube may be se
suitable hard metal.
curely mounted in any position so that its ends
Wedge member I! is preferably constructed so
are free to vibrate by securing to an external,
that its inner surface ?ts snugly against the
medial portion of the element a wedge member 25 outer surface of element I I‘. The outer surface of
which is concentric with the longitudinal axis
wedge member I! is uniformly tapered so that
of the element, and by providing means for forc
this outer surface will provide a smooth and uni-_
ing the wedge member into a bevelled seat in a
form contact against a bevelled or conical seat_
suitable supporting structure.
member l4.
One object of the present invention is to pro 30
Seat member I! may be a ring-like member
vide a secure and rigid means for mounting an
elongated bar or tube or magnetostrictive ma
terial in any position so that its ends are free to
having its inner surface bevelled to receive wedge
member l2, and seat member 14 may be welded
or otherwise securely affixed to a supporting
vibrate.
structure I 5 such as a plate or bracket by welding
Another object of the present invention is to 35 seat member it to bracket l5 at the points desig
provide a secure and rigid means for mounting
nated by numeral l6. It will be apparent that
an elongated magnetostrictive element so that it
bracket l5 may be mounted to other support
may be readily transported from place to place
means such as the wall‘ of a building, as de
without upsetting the position of the element rela
sired.
‘
tive to the supporting structure.
A plurality of conically tipped set screws are
40
Still another object of the present invention is
arranged on diametrically opposite sides through
to provide a secure and compact means for
seat member l4 at _a position such that the coni
mounting an elongated magnetostrictive element
cal tips of said screws will contact the upper edge
in an apparatus adapted to the acoustic logging
of ring wedge l2, thereby forcing wedge i2 to seat
of subsurface formations penetrated by a bore 45 ?rmly in seat member ll.
hole.
It will be apparent that although seat member
Other and further objects of the present in
i4 is shown in Fig. 1 as a. ring-shaped member
vention will appear from the following description
mounted in a ?at plate, seat member l4 need not
when read in conjunction with the accompanying
necessarily be a separate element welded to the
drawing in which
50 support structure l5. Thus, support structure l5
Fig. l is an elevation, partly in section, of an
might'be a relatively thick plate having a '
elongated magnetostrictive element mounted in a
bevelled opening adapted to receive ring wedge
supporting plate in accordance with one embodi
l2 provided suitable means are employed to force
ment of the invention;
‘
ring wedge i3 securely into its seat and hold the
Fig. 2 is a plan view of one embodiment of a
seat member for the mounting means for my in-.
ventlon;
Fig. 3 is a sectional view along the line III-III
of Fig. 2;
element and ring wedge in this position. Similar
ly, ring wedge I2 need not necessarily be a rela
tively thin ring-like member as illustrated in the
drawing but may be a ring-like member having an
appreciably larger outside periphery than the
Fig. 4 is a plan view of one embodiment of a 60 periphery of the magnetostrictive element.
2,407,":
3
It will be apparent that the ring wedge and
bevelled seat construction illustrated in Fig. 1
is compact and particularly suitable for mount
ing an elongated magnetostrictive element in a
confined space such as a tubular well logging
device to be described in conjunction with Fig. 6.
Referring to Fig. 2, numeral I4 designates gen
erally a plan view of the bevelled seat member
shown in Fig. 1. Seat member I‘ is provided
4
scribed herein. An apparatus for logging sub
surface formations in accordance with the ap
paratus shown in Fig. 6 and including a suitable
electron tube oscillator is disclosed and speci
?cally claimed in my copending application Ser.
No. 763,940, filed July 26, 1947.
Although I have described wedge member I2
as a ring wedge and have ‘illustrated this mem
ber in ‘the form of a circular band about ele
with a bevelled face I 8 and a plurality of threaded 10 ment II , it is to be understood that the outer
perimeter of member l2 may be rectilinear, rath
holes I! arranged on diametrically opposite sides
er than circular, so long‘ as it conforms to the
of the member and adapted to receive the coni
opening in seat member I4. Similarly, although
cally tipped screws I1 referred to in Fig. 1.
I have illustrated one mode of forcing wedge
The seat member of Fig. 2 is shown in sectional .
elevation in Fig. 3 wherein" similar numerals 15 member I2 into seat member I4 by means of
conically tipped screws I‘I passed through seat
member II, other equivalent means for holding
Referring now to Figs. 4 and 5, the numeral
wedge member l2 seated in member ll will read
‘l2 identi?es a plan view of one embodiment of
ily occur to workers skilled in the art.
ring wedge I2 described in conjunction with Fig.
Having fully described and illustrated the pres
1. As will be seen from the drawing, ring wedge 20
ent invention, what I desirev to claim is:
I2 is provided with a conically tapered outer sur
1. An improved mounting for a magnetostric
face 20 which is adapted to seat against the face
tive element adapted to permit free vibration of
I8 of seat member I4. Wedge member I2 is also
the ends thereof which comprises an elongated
provided with an inner face 2I which is adapted
to ?t snugly against the outer periphery of the 25 element of magnetostrictive material, a wedge
member rigidly amxed coaxially around the outer
magnetostrictive element referred to by the nu
periphery and substantially midway between the
meral I I in Fig. 1.
ends of said element, a rigid supporting member
It will be understood that the angle of taper
defining an opening having a bevelled seat
of the face 20 with respect to the inner face 2I
of wedge member I2 is not critical so long as 30 adapted to receive said wedge member, and means
‘for forcing said wedge member to seat in said
the inner surface I8 of seat member I4 is bevelled
identify similar parts.
at a similar angle.
In the practice of my inven- _
opening.
2. A means. for mounting a magnetostrictive
element within a borehole logging device and
other angles may be used.
35 adapted to permit free vibration of the ends of
said element which comprises an elongated cy
Turning now to Fig. 6, my improved means
lindrical element of magnetostrictive material,
for securely mounting an elongated magneto
a ring wedge rigidly ailixed coaxially around the
strictive element within a tubular'well logging
outer circumference and substantially midway
device is illustrated. In the embodiment illus
trated in Fig. 6, a ring wedge member I2 is se-, 40 between the ends of said element, a tubular body
arranged coaxially around said element and said
cured to the medial portion of an elongated mag
ring wedge, a seat member, de?ning‘a circular
netostrictive element II, as by silver soldering
opening adapted to receive said ring wedge, rig
thereto, and bevelled seat member I 4 is secured
idly a?ixed coaxially within said tubular body, and
to a pair of tubular outer shell members 22 and
a plurality of screws arranged in diametrically
23 as by welding, brazing or silver soldering
opposite walls of said tubular body to force said
thereto. Outer shell members 22 and 23 may be
ring wedge into said bevelled seat.
provided with end members 24 and 24' which
3. An improved mounting for a magnetostric
may be threadedly engaged in the outer ends
tive element adapted to permit free vibration of
thereof. A pair of coils 25 and 26 arranged upon
spool-like members 27 are clamped by means of 60 the ends thereof which comprises an elongated
element of magnetostrictive material, a wedge
a bolt 28 onto each plane face of a plate 29 whose
member rigidly a?lxed coaxially around the outer
plane is perpendicular to the longitudinal axis
periphery and substantially midway between the
of element II. As will be seen in the drawing,
ends of said element, a rigid supporting mem
the plate 29 is preferably secured midway be
tweenfthe ends of element II by a plurality of 65 ber comprising-a tube arranged coaxially around
said elongated element and having rigidly af~
diametrically opposite pins 30 driven through ring
?xed therein a seat member defining an opening
wedge I2, element II and thence into plate 29.
adapted to receive said wedge member, and
As in the embodiment .of Fig. 1, ring wedge I2
means for forcing said wedge member into said
is caused to seat ?rmly in seat member I4 by
seat member.
means of a plurality of conically tapered screws
CLARE H. KEAN.
I‘! which may pass through tubular shell ele
tion, I have found that an angle of taper of 7°
between faces 20 and 2| is satisfactory although
ment 22.
_
In order to excite magnetostrictive element II,
coils 25 and 26 are preferably connected through
pairs of conductors 30 and 3| to suitable means
32, such as an electron tube oscillator, which
may conveniently be arrangedwithin end mem
ber 24'. Electrical power for means 32 is pref
erably supplied through a multi-conductor cable
33 connected therewith. Since the means for 7
exciting element II is not a part of the present
invention, details of means 32 will not be de
REFERENCES CITED
The following references are of record in the
file of this patent:
‘
UNITED STATES PATENTS
Number
1,650,131
Name
Date
Johnstone _______ __ Nov. 22, 1927
1,680,900
McQuaid ________ _; Aug. 14, 1928
2,207,469
Roye ____________ __ July 9, 1940
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