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Патент USA US2404811

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July 30, 1946.
F. omo‘
2,404,81 1
Filed Nov. 4, 1944
Patented July 30, 1946
Frank Orio, Long Branch, N. J.
Application November 4, 1944, Serial No. 562,009
2 Claims.
(01. 51-161)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 0. G. 757)
The invention described herein may be manu
factured and used by or for the Government for
tion to provide positioning means for the upper
lapping plate which, while allowing the two plates
governmental purposes, without the payment to
to be insulated from each other, are nevertheless
me of any royalty thereon.
not subject to rapid wear or breakage.
This invention relates to improvements in lap
It is another object to provide positioning means
ping machines.
which will allow the upper lapping plate to be
Due to the enormous demand created by the
placed in the machine and removed therefrom
war for crystals of the piezoelectric type for fre
in a less exacting manner than required by the
quency control purposes, mass production grind
prior art machines.
ing methods have been developed. One impor 10 It is still another object to provide a positioning
tant grinding or lapping machine has evolved
means which will eliminate the dropping of spacer
from the drill press and is capable of simultane
rods with the resultant loss of time and sometimes
ously lapping a large number of crystals on both
of rods.
sides. Every effort has been made to perfect the
It is a further object to provide positioning
machines to save time and materials and to sim 15 means which, in ordinary use, do not separate
plify the lapping operation.
Such a machine is provided ‘with two spaced,
‘ from the machine but which may be moved aside
before and after the lapping operation.
Other and further objects will become clear
from the speci?cation and claims hereinafter set
is a crystal carrier which holds a plurality of 20 forth.
crystals. A rotary motion is imparted to said
The objects aforesaid are achieved by eliminat
crystal carrier by the spindle of the drill press
ing the separable spacer rods entirely. Instead,
horizontally disposed, lapping plates, one above
the other. Loosely positioned between said plates
which operates through a small crank and there
aligning bracket members are provided which in_
by moves the crystals between the lapping plates.
clude nonseparable spacer ?ngers, of insulating
In some of these machines the upper lapping 25 material. This precludes the possibility of drop
plate is maintained in register with the lower ‘ ping, losing or breaking said ?ngers, and avoids
plate by four, separable, spacer rods. The inner
the necessity of carrying the heavy lapping plate
ends of said rods extend into holes about the
with several easily separable spacer rods loosely
periphery of said upper plate and their outer
disposed about its periphery. The said spacer
ends into vertical slots in aligning brackets se 30 ?ngers are pivotable so that they can be moved
cured to the base of the machine. In order to
out of the way, thereby simplifying and making
place the upper plate, which ordinarily weighs
less exacting the operation of placing or remov
some ten to twenty pounds, into its operating
ing the upper lapping plate and de?nitely making
position, the four spacer rods are inserted into
it a one man operation. Said ?ngers are also
the holes about the plate’s periphery and the
provided with replaceable metal tips at the point
plate is lowered into position manually. This is .35. of wear, thereby making replacements less fre
rather awkward and exacting as the rods drop
quent and then requiring replacement of the tips
out if the plate is not held exactly horizontally,
only. The ?ngers are ‘also adjustable to allow
and all four rods must be simultaneously guided
into the four slots aforementioned. The result 40 for lapping crystals of different thicknesses,
The novel features, which are believed to be
is that spacer rods are frequently dropped and
characteristic of the invention, are set forth with
sometimes lost, spacer rods and crystals are fre
particularity in the appended claims, but the in
quently broken, additional time is spent in mak
vention itself will best be understood by reference
ing several attempts to perform this step and in
to the embodiment set forth in the following de
making adjustments, and sometimes the job re
quires the services of two persons.
scription taken in connection with the accom
As the progress of the lapping operation is
panying drawing, in which
checked by periodically testing the crystals for
Figure 1 is a perspective view of the lower por
frequency, the two lapping plates must be insu
tion of a crystal lapping machine embodying the
lated from each other. Hence, the crystal car 50 present invention, the spacer ?ngers being shown
rier and the spacer rods are made of some in~
in their operating positions;
sulating material, such as Bakelite. This results
Figure 2 is an elevational view of Figure l, the
in rapid wear and frequent replacement of the
spacer ?nger to the left being shown in its non
operating position;
It is, therefore. an object of the present inven 65
Figure 3 is an enlarged vertical cross sectional
view of the left hand aligning bracket member
of Figure 1; and
Figure 4 is a perspective view of the aligning
bracket member of Figure 3.
The lapping machine, shown in the drawing,
stands upon a base | I, having .a flat, horizontally
disposed, top surface I3. Resting upon said sur
face I3 is a metal, disc-like, lower lapping plate
l5, the top, ?at, horizontal surface I1 of which
forms the lower lapping surface of the machine.
Positioned about the lower lapping plate l5 are
four aligning bracket members I9, each of which
is secured to the base II by means of a machine
screw 2|.
Spaced above the lower lapping plate I5 is a '
In operation of the lapping machine shown
in the drawing, the lower lapping plate [5 is
placed upon the base | | coaxial with the spindle
31. The four aligning bracket members I9 (their
spacer ?ngers 5| all being ?ipped upwardly and
outwardly to their nonoperating positions as
shown at ‘the left side in‘ Figure 2)‘ are then
loosely screwed to the base H by means of the
screws 2|. They are moved inwardly until they
abut the periphery of said lower lapping plate
|5 whereupon the screws 2| are tightened. The
crystal carrier 33 is then placed upon the lower
lapping plate l5 and the proper number of crys
tals 3| are dropped into the holes 35.
The upper lapping plate 23 is then lifted man
ually by the handles 29 and lowered onto the
crystals 3!. Although it should be in register
with the lower plate I5, it will be seen that, as
metal upper lapping plate 23 of the same diame
ter, the lower, ?at, horizontal surface 25 of which
forms the upper lapping surface of the machine.
the spacer ?ngers 5| are out of the way, there
The central portion of said upper lapping plate
23 is cut out to form a circular aperture 21 con 20 will be suf?cient room ‘to allow the said upper
lapping plate 23 ‘to be placed easily into its ap
centric with the plate’s outer periphery. Said
proximate position. This is much simpler than
upper lapping plate 23 is also provided with two
lifting handles 29.
is the case in prior art machines, where exact
Interposed between the two lapping plates I5,
Said crystals3| are retained in spaced relation
ship relative to each other by a carrier 33 which
positioning while the plate is being lowered is
requisite. After the plate 23 is resting upon the
crystals 3|, it becomes a simple matter to ?ip the
spacer ?ngers 5| upwardly and then inwardly to
is a disc of insulating material, such as Bakelite,
their substantially horizontal operating positions
of smaller diameter than the lapping plates I5,
23 and pierced by a circular axial hole 33 and
(as shown in Figures 1 and 4), the upper plate
23 being slid horizontally slightly, if necessary,
a plurality of holes 35 shaped to loosely receive
the crystals 3|. The carrier 33 is not as thick
to enable the said ?ngers 5| to be dropped into
place. The adjusting screws E3 may be set for
23 are a plurality of crystals 3| to be lapped. ~
the thickness of the particular crystals being
as the crystals 3| which are to be lapped. The
machine may be provided with several carriers
worked on.
The depending pin 4| of the crank 39 is‘ then
33 of different thicknesses and having different 35
lowered into the center hole 36 of the carrier 33
sized holes 35 so that a suitable carrier may be
through the central aperture 21. Rotation of
used in lapping crystals of a particular thickness
and size.
the spindle 31 will then cause the crystals 3| to
I v
Axially positioned above the lapping plates I5,
move about horizontally between the upper‘and
23 is a spindle 31 which is rotatable by a motor 40 lower lapping surfaces I1, 25 a, suitable grinding
compound being applied. The progress of the
(not shown). Secured to the lower end of the
lapping is ascertained by a frequency meter (not
spindle 31 is a crank 33 ?tted with a depending
shown) through the conductor cable 51 and the
pin 4| which is of a size to make a rotatable fit
plugs 65.
in the center hole 33 of the carrier 33.
It will be noted that the inner ends of the hori
Each of the aligning bracket members IS in 45
zontal arms of the brackets 43 hold the lower lapf
cludes a bracket 43 of metal which is in the shape
of an elbow. The horizontal arm of said bracket
43 is pierced by an elongated vertical hole 45
ping plate l5 in place and the spancer ?ngers 5|
hold the upper lapping plate 23 in position in
register with it. When the spacer ?ngers 5| are
tioned.v The upper end of the vertical arm of 50 ?ipped to their outward, nonoperating positions,
they should pivot through at least ninety degrees
the bracket 43 is bifurcated to form two up
so that they say put and do not fall back by them
wardly extending projections 4-1 with a slot 49
receivable to one of the screws 2| aforemen
A spacer ?nger 5| of insulating material, such
selves. Actually, in the preferred embodiment
shown in the drawing, said spacer ?ngers 5|
as Bakelite, has one narrow outer end which ?ts 55 pivot through well over one hundred eighty de
loosely into the slot 49 between the projections
41. Said spacer ?nger 5| is pivoted to said pro
grees so that said ?ngers and their adjusting
screws 53 swing completely out of the way.
To remove the crystals 3 | ,1 after they have been
jections 41 by means of a pin 53 which extends
lapped, the depending pin 4| is raised by raising
through the two projections 41 and the narrow
end of the spacer ?nger 5i, and is held in place 60 the spindle 31. The spacer ?ngers 5| are again
flipped upwardly and outwardly and the upper
by a cotter pin 55. The wider inner end of the
lapping plate 23 is raised out of the way to expose
spacer ?nger 5| is tipped with a metal cap plate
the crystals 3|.
51, having a curved face. Said cap plate 51 is
It is to be noted that, both in placing and in
held in place by a machine screw 59 and is kept
from rotating about said screw by a pin 6| se 65 removing the heavy upper plate 23, meticulous
accuracy of movement is not requisite and no
cured to the cap plate 51 and extending into a
loose parts can fall out. ‘Hence, the operation
horizontal hole in the end of the spacer ?nger
is greatly simpli?ed, thereby saving labor and
5|. Threaded transversely into the bottom of
time and precluding the breakage of crystals and a
the spacer ?nger 5| is a vertically disposed ad
justing screw 53, the head of which rests upon 70 parts of the machine. Also wear is largely local
ized in the cap plates 51, which may be
the lower end of the slot 49.
periodically replaced. Obviously, however, such
Electrical contact is made with the two lapping
replacement is much less frequent than the re
plates I5, 23 by means of two disengageable plugs
placement of spacer rods made of Bakelite‘ and
55 attached to the end of the double conductor
vcable 61.
the like, as in conventional machines.
Although the embodiment herein described to
degrees, a replaceable tip on the inner end of the
illustrate the present invention is shown in con
nection with a crystal lapping machine, it will
be understood that it is within the spirit of the
invention to apply it to other lapping or grinding
machines and to other uses.
What is claimed is:
1. An aligning bracket member, comprising a
spacer ?nger, a screw threaded transversely into
the spacer ?nger and adapted to rest upon the
vertical arm to adjustably support the spacer
?nger in a substantially horizontal position.
2. An aligning bracket member comprising a
bracket, said bracket including substantially
vertically and horizontally disposed arms, means
on said horizontally disposed arm to allow the
bracket, having a horizontal arm and a vertical
arm, an elongated hole extending vertically 10 bracket to be translated horizontally to a plu
rality of positions and rotated about Vertical axes,
through said horizontal arm, two vertical pro
a spacer ?nger pivotably secured to the vertically
jections at the upper end of the vertical arm, a
disposed arm, means to adjustably support said
spacer ?nger of insulating material, the outer
?nger in a substantially horizontal operating po
end of said spacer ?nger being positioned be
tween the projections aforesaid, a pivot pin ex 15 sition, said ?nger being pivotable from its said
operating position upwardly through in excess of
tending through the said projections and the
ninety degrees to a nonoperating position.
spacer ?nger, the spacer ?nger being pivotable
about said pivot pin through more than ninety
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