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Патент USA US3072456

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Jan. 8, 1963
Filed June 9, 1961
BY [/Uw
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United States Patent 0
' 1
r 3,072,446
Patented Jan. 8, 1963
William E. Taylor, Oakland, N.J., assignor to the United
States of America as represented by the Secretary of
the Air Force
' Filed June 9, 1961, Ser. No. 116,211
5 Claims. (Cl. 308-59)
FIG. 2 shows the state ‘of the art which the present
invention seeks to improve;
Referring more particularly to the drawing, the straight
‘shank 12’ of the pivot tip 10’ shown in FIG. 2 has been
retained as element 12 in the improved device. The ele
ment 12 may be referred to as a shank or pivot holder,
its characteristic, as distinguished from the shank 12
of the prior art being a smooth surface uninterrupted by
screw threads and capable of sliding engagement in the
This invention relates to a pivot support for miniature 10 casing 16. It will be noted that the screw threads 14
?oated units and, more particularly, to the pivot, support
of the original device have been eliminated and the
and alignment of moving components of the family of
surface of the shank presents a smooth surface. A de
navigation components commonly known as ?oated units.
vice has been provided for retaining a smooth surface
Acute ‘problems arise from construction of miniaturized
and, at the same time, preventing shank or pivot holder
?oated units whose outside diameter is of the order of, 15 12 from sliding out of the casing or other mounting ele
one inch.
ment 16. The shank or pivot holder 12 is provided
For example, in a ?oated gyro ‘or accelerometer where
the ?oat is supported by some kind of pivot and jewel
arrangement, the problem of mounting the components
with a neck portion 18 of reduced diameter and a head
20 which may be an eccentric ?ange or rectangular block.
Shims 32' can be inserted sideways over the neck
’ and achieving the exacting alignment tolerances required
portion 18 and turned to the position ‘shown in FIG. 1.
is a very complicated one. In precision instruments of
These shims can be introduced in the number necessary
7 this kind, it is important not only’ to have the critical
to provide spacing and axial adjustment of the shank 12.
parts in near perfect alignment, but also to provide a
The head or ?ange 20 is uniquely arranged to prevent the
means of adjusting the axial freedom of the component
escape of the shank 12 from the casing. A screw thread
and. then locking it in place in the desired position of 25 ed member 22 engages in a. bore 24 in the casing 16.
adjustment. In miniaturization of these components,
The bore 24 is axially parallel to and spaced from the
these problems are made more acute by the small size of
bore which accommodates the smooth surfaced mem
the elements and the lack of space. The method most
ber 12. It is provided with a spacing element 26, and
commonly used to support the ?oat is the one shown in
a knurled head 28 for adjustment. An anchoring ele
FIG. 2 of the drawing. This illustration does not in
ment 30, which may be beryllium copper or comparable
corporate the features of the invention and is presented
resilient material, is held between the head 28 and the
to show the state of the art. In this type of element, the
spacer 26. This element is, in fact, a leaf spring and
pivot tip 10’ is pressed into a holder or bearing in the
provides resiliency for adding or removing shims 32
element to be supported and consists of a straight sec
while holding the pivot holder ?rmly in its bore.
tion 12’ and a threaded section14. A small screwdriver 35 Small horseshoe-shaped shims 32 are inserted under
slot 13 ‘in the screw ?tted end makes possible the axial
the ?ange 20. The number and size of the shims selected
adjustment of the pivot member so that axial play of
determine the position and degree of axial freedom of
the ?oated component is provided for. Once the adjust
the ?oat.
ment has been made, the pivot is locked in place by 40 The simpli?cation of the pivot has made it possible to
cement or other means.
attain the close tolerances necessary for the proper align
While the method is seemingly satisfactory, it has
ment of the pivot. Furthermore, the end shake setting,
many shortcomings. Experience has shown that it is
i.e. the experimentally determined proper position is an
‘ practically impossible to machine a'thread of the order
tomatically locked by the leaf spring. The assembly of
of 0—80 and keep it concentric with the shank. The
these parts and the ?nal setting of the axial play are
mating section of the microsyn, synchro or other element 45 both simple procedures. The pivot is slipped into the
being mounted complicates these problems even more
microsyn and the leaf spring is assembled with its hold
where achieving alignment is the chief concern. The
down screw. The thickness of the shims required varies
shank of the pivot which serves to align the pivot radially
only siightly from unit to unit and the initial shims can
will ?t snugly into the bore of the component so that
be selected so that very little subsequent change is needed.
the eccentricities of the threads make it impossible to
The ?oat is moved back and forth in the axial direction
adjust the pivot without having it bind. Furthermore,
and, by means of a dial indicator, the actual end shake
. this screwdriver slot almost invariably causes the forma
~ or setting is determined.
The ?nal setting can thus be
tion of burrs and this greatly increases the danger of
achieved by adding or subtracting shims. This operation
binding. Lastly, the method of locking the pivot makes 55 can be completed in one, or at most two, steps.
any later adjustment impossible.
While the invention is shown and described in con~
It is the object of the present invention to overcome
all of these difficulties. The important advantages pro
vide by the invention are:
nection with one form for illustrative, rather than restric
tive purposes, it is obvious that changes and modi?ca
tions may be made by those skilled in the art without
(1) A pivot holder is provided which makes it relatively 60 departing from the scope and spirit of the invention
as de?ned in the accompanying claims.
simple to achieve the close tolerances necessary for
I claim:
the proper performance of the unit.
1. A pivot. support for ?oated units‘ comprising a cas
(2) A rapid and reliable method of setting the end shake
ing, a smooth surfaced cylindrical pivot holder insertable
or allowable axial play of the ?oat.
65 in a smooth bore in said casing, a neck on said holder of
' (3) An automatic locking feature.
The straight shank of the original pivot has been retained
but has been extended over the whole length of the pivot
holder. The threads on this element have been com
pletely eliminated.
In the drawing,
FIG. 1 is a vertical cross section of the device.
smaller diameter than the diameter of said pivot holder,
shims, selectable in number, and insertable on said neck
for de?ning axial movement of said pivot holder, a ?ange
attached to said neck of larger diameter than said bore,
.70 a screw threaded element insertable into a second bore
in said casing in screw threaded relationship therewith,
said ?rst and second bores being spaced and axially paral
lel, a head on said screw threaded element, a spacing ele
ment on said screw threaded element, a leaf spring posi
tioned between said spacing element and said head, said
leaf spring extending over a portion of said ?ange to hold
said pivot holder in said ?rst-named bore for providing
pivot holder component, said anchoring element being
adjustable by means of said screw threaded element.
4. A pivot support comprising a casing, a pivot holder
slidably mounted in a bore in said casing, 21 head on
said pivot holder extending over a portion of the exterior
a governable pressure on said pivot holder.
of said casing, spacing shims selectively insertable be
2. A pivot support for a ?oated unit comprising a cas
tween said head and said casing, means for anchoring
ing, a smooth surfaced pivot holder positioned in a bore
said pivot holder in said casing, said means comprising
in said casing, a ?ange on said pivot holder positioned
a screw threaded element mounted in said casing spaced
on the exterior of said casing and of larger dimensions 10 from and mounted independently of said pivot holder
than the area of said bore, means for maintaining said
and capable of exerting anchoring pressure thereon.
pivot holder in said bore, said means comprising a leaf
5. A device for screw threadedly anchoring a slidably
spring in anchoring position for anchoring said pivot
holder, screw threaded means independent of said pivot
holder for adjustably anchoring said leaf spring.
3. A pivot support comprising a slidably mounted pivot
holder component, means for mounting said component
in a casing to allow axial movement thereof, means for
adjusting the axial freedom of said component and means
for locking said component at a selected position of ad
justment, said means for adjusting the axial freedom of
said component comprising, a selected number of horse
shoe shims insertable in a neck of said component, a
screw threaded element mounted in said casing spaced
from and independent of said pivot holder component
and an anchoring element for exerting pressure on said
mounted microsyn pivot holder, said device comprising
a pivot holder slidably mounted in a bore in the casing
15 of said microsyn, a screw threaded element also mount- '
ed in the casing of said microsyn spaced from, parallel
to and independent of said pivot holder, a leaf spring
mounted on said screw threaded element and capable of
holding said pivot holder in said bore and exerting pres
sure thereon.
References Cited in the ?le of this patent
Saal ________________ __ June 18, 1918
Sasse _______________ ..._ May 19, 1953
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