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Патент USA US2408317

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"2,408,316
Patented Sept. 24, 1946
UNITED STATES PATENTKOFFICE
ADJUSTMENT FIXTURE
-
Vincent G. Jarman, Watchung, N. J ., assignor to
.Western Electric Company, Incorporated, New
York, N. Y., a corporation of New-York
' Application March 23, 1943, Serial N0. 480,169
4 Claims. (Cl. 24,8-r-124)
.
2
1
and more particularly to a device for holding an
held in the ?xture;
-
'
in
'
v
Fig. 6 is a section on the line 6-6 of Fig. 5;
Fig. 7 is ‘a 'plan view of the leftend of the show
article to be operated on in predetermined rela
tion to means for illuminating and inspecting the
article.
,
Fig. 5 is a front elevation of a double grid to be
This invention relates to an adjustment ?xture
There are many instances in various arts where
an article composed of a plurality of components
,7 ing- of Fig. 3 with the grid assembly removed, and
Fig. 8 is a front elevation of the showing of
Fig. 7.
-
The apparatus herein disclosed as an illustra
needs to have minor adjustments of its component
tive embodiment of the invention, is a ?xture for
elements relatively to each other made after as
sembly of the article before the article is satis la’) holding and inspecting a double concentric grid
intended to be used in vacuum tubes, while the
factorily usable for its intended purpose. Thus,
certain vacuum tubes for use in the electrical arts
have a double, concentric grid, i. e. a pair of flat
tened helices of wire of. the same pitch, of which
turns of the helices of the grid are being man
ually adjusted to mutual parallelism. To make
the nature, purpose and scope of the invention
one is within the other and both are mechanically ..
supported on a common base by means of sep
as illustrated in this particular embodiment more
arate pairs of posts. For some uses, it is impor—
tant that each half turn of the wire of one helix
no part of the invention, will be described first so
lie accurately parallel to the corresponding half
The grid assembly, for which the device of the
easily apprehended, the grid assembly, which is
far as relevant to the invention.
1
turn of the other helix and in a plane perpen 20 invention is primarily designed, is shown by itself,
in one specific form only, in Figs. 5- and 6. It
dicular to the common plane of the four posts
comprises a pair of identically similar bases 18
of the two helices.
,
and l I of insulating material, preferably ceramic,
An object of the present invention is‘ ‘to provide
a device or adjustment ?xture to hold an article
in predetermined relation to a predetermined line
of sight and ‘to a means of illumination, and hav
ing means to change the position of the article in
predetermined fashion with respect to the line of
sight.
in which are mounted, in a central plane, longi~
tudinal of the unit as a whole and transverse to
the bases Ill and l I, four metal members 1 2, which
will be the plate of the vacuum tube, and two pairs
of metal rod grid supports I ,4, l5 and I5, ll re
. spectively.
.
The two rods of each pair are on op
With the above and other objects in view, the 30 positesides of the plate members l2 and coplanar
with these, the pair [4, It being also outside of
invention may be embodied in a device or ?xture
the pair l6, ill. The plate members 12 terminate,
having means to determine a line of sight, a sup
hold together, and space apart the bases ill and
port to receive and hold an article in the line of
II. The grid supports l4, l5, l6 and H pass
sight, means to illuminate the face of the article‘
facing the line of sight, means to adjustably . through and extend beyond the outer faces of the
bases. The plate members are electrically inter
traverse the support perpendicularly to the line
connected by means not visible in the ?gures
of sight, and means to rotate the support about
and also to terminals l3 mounted on the under
an axis perpendicular to the line of sight.
face of the base Ill. Elastic, laminar, contact ?ns
Other objects and features of the invention will
appear from the following detailed description of 40 l8 are mounted on the bottom ends of the rods
[4, l5, I6 and H.
one embodiment thereof taken in connection with
The rod-shaped grid supports Ill, l5, l6 and I1
the accompanying drawing in ‘which the same
are each provided on their outer sides with suit
reference numerals are applied to identical parts
ably spaced and located notches I9, 20, 2! and 22
in the several ?gures, and in which
45 respectively, to hold and support the consecutive
Fig. l is a view in perspective of a double grid
adjustment ?xture constructed in accoradnce
with the invention;
coils or turns of two ?at helices .25 and 25 of wire.
The supports are so held in‘the bases and the
notches in the supports are so spaced and located
Fig. 2 is a‘detached, enlarged, centraL-vertical
that to each notch 2| vcorresponds a notch I9 at
section through the lens and ?rst screen; '
50 the same distance from the base l0, and vto each
Fig. 3 is a detached, enlarged, section through
notch 22 similarly corresponds a notch 26, except
the grid support traversing means and rotating
for the two uppermost and one lowermost notches
means, transverse to the line of sight;
2| and 2-2 for which there are no correspondent
Fig. 4 is a section through ‘the showing of Fig. 3
notches.
and at right angles thereto;
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_
.
e
The notches are further so located and spaced
g
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2,408,316
3
4
that a wire 23 wound in the notches l9 and 2D and
ing means on the base H], e. g. the recesses 55, 55,
a wire 24 wound in the notches 2i and 22 in the
manner shown, form the two helices 25 and 26
respectively, whose respective half turns are to
accurately predetermined relative position. To
hold the grid assembly removably in this position
run parallel each to each in planes perpendicular
. to the plane of the plate members I 2. The article
and so to locate the base It! on the block 43 in an
clip springs 56, 56 are provided to frictionally en
gage the base [0.
Along one up and down edge of the screen 35
.thus described when ?rst assembled, will have the
and behind the screen’ is positioned an elongated
corresponding"coils of the two‘ helices apprgxi
light source, e. g. a ?uorescent lamp 5'! in tubular
mately'in the desired positions relatively to each
other and to the axial plane of the whole. The 10 form, fed with electric current from any con
venient source, not shown. Such a light source
problem then arises of how to hold and manipu
will illuminate the front side of a grid assembly,
late this assembly safely and conveniently, while
each half turn of one or the other helix is ad-‘ ' mounted on the block 43 as indicated in Fig. 1,
in a substantially shadowless and glareless man
justed to run parallel to its correspondent in the
other helix and with the common plane of the two 15 ner, as seen through the slot 4|, lens 49, and slot
at right angles to the axial plane of the assembly.
31, making accurate inspection of the grid wires
This is the purpose and function of the device
or ?xture shown in Figs. 1 to 4 inclusive. This
?xture comprises a main base 33, either heavy
enough in itself to givefstability to the whole or
easy and not tiring to the eyes, since the light
to be- secured or clamped on a bench or table.
Upon this is mounted a tiltably adjustable, plate
like base 3|. An upstanding, transverse wall
falls on the horizontally disposed wires over a
considerable angle from well below the line of
sight to well above it. Hence, each, wire visible
in the ?eld of vision is substantially equally il
luminated over a portion of its periphery greater
than the visible portion. To ensure this, as well
as to concentrate attention on the particular pair
member 32 is rigidly secured on the base 3 1. Near
the upper edge of the wall 32, two parallel tubu 25 of wires to- be adjusted, the slots 4| and 31 are so
dimensioned that with the forehead against the
lar supports 33, 33 are rigidly mounted in the wall,
extending therethrough at right angles thereto.
Support rods 34, 34 are slidably adjustable in
the tubes 33 and may be clamped in adjusted
eye shade 42 and the rack 44 suitably elevated,
the particular pair of wires in question will lie
horizontally and one behind the other across the
position by means of clamp screws 35, 35. A 30 middle of the elongated narrow horizontal ?eld
of view, preferably with a few but only a few of
depending laminar screen or optical diaphragm
the neighboring pairs above and below also in
3B is rigidly supported on the forward ends of
sight. If the slots be narrow enough to limit the
the tubes 33‘, and is formed with a transverse slot
?eld to a single pair of wires, diffraction dis
31. On the forward ends of the rods 34 is mounted
turbances are apt to produce eyestrain, darken
a depending, transverse housing 38 in which is a
ing of the ?eld and indistinctness. A convenient
laminar screen or optical diaphragm 39 formed to
‘ basic factor is to select the lens 49 with a focal
fit over the front surface of a magnifying lens 40
length of 6 to 12 inches, preferably about 9 inches,
also held in the housing 38. The screen 39 has a
and dimension the rest of the apparatus to corre
transverse slot 4|. An eye shade 42 may be
spond. The distance of the lens 40 from a grid
mounted on the forward side of the housing 38 if
assembly on the block 43 is made adjustable at
desired. The front faces of the wall 32, screen
35, 35, to adjust this to the requirements of dif
35 and screen 39 are preferably made matt black
ferent eyes.
by being suitably painted or Otherwise.
Since the grid wires to be adjusted relatively
' Between the wall 32 and the screen 35, a grid
assembly support block 43 is mounted on a rack 45 to each other lie in different planes transverse
to the optical axis of the device, i. e. at different
44 to be pivotable about an axis in the line of
distances from the eyes, it is practically neces
_ reciprocation of the rack. The rack is recipro
sary to have the apparatus arranged for binocular
cable up and down in a pedestal 45 rigid on the
vision as otherwise it would be dif?cult, or even
base 31 and is engaged by a pinion 46 on a shaft
47 journalled in the pedestal 45. Means as indi 50 impossible, for the operator to be visually certain
which of two grid wires under simultaneous ob
cated at 48 are provided to supply sufficient fric
servation stands in front of the other. Hence is
tional resistance to the rotation of the shaft 41 to
derived the peculiar value of the slotted dia
prevent the weight of the members mounted on
phragms de?ning the horizontally elongated and
the rack from moving the latter down and, in
vertically limited ?eld of vision.
general, to prevent motion of the rack and of the
With the apparatus as shown in Fig. 1 and a
block 43' up or down, unless the shaft 4! is inten
grid assembly in place on the block 43 and the
tionally rotated by one of the knurled heads
block in its lowest position, the front half of
~ 49, 49. Means as indicated by the spring pressed .
the top coil or turn of the outer helix 25 should
ball 53 acting on corresponding indentations 5i
be at or below the horizontal center line of the
in the integral pivot formed on the rack, to main
tain the block 43 yieldingly in either of two posi
?eld of View. If it is below the center, the half
turn is brought up to the center by turning one
tions 180° apart. The block 43 is formed on its
of the knurled heads 49. The corresponding front
upper side with a groove or slot 52 to act as clear
half turn of the inner helix 26 should then be in
ance space for the parts of a grid assembly which
project below the assembly base It when the as
visible over its whole length behind the half turn
sembly is placed on the block 43 in the position
of the outer helix 25. If it is not, the operator,
with a pair of tweezers or other suitable imple
- indicated in the ?rst four ?gures.
ment, will bend one or the other or both half
To positively locate the grid assembly in an
turns of the pair until this condition exists. A
accurately predetermined position on the block
43, there is provided a positioning member 53 70 head 49 is then turned to bring the next pair of
front half turns to the center of the ?eld and
mounted on the block 43 across one'end of the
these are corrected if necessary. This is repeated
slot 52. The thickness of the member 53 is the
until the whole front side of the assembly has
same as that of the grid assembly base ID. The
been inspected and corrected if necessary, coil by
member 53 is formed with locating means such
as?ngers 54, 54 to ?t into and engage correspond 75 coil. The block 43 is then rotated, forcing‘the
2,408,316
5
6
spring latch'5? out, until it catches again 180°
rigidly mounted beside and spaced from the opti
away.
cal axis of the system, a support carrier mounted
in the support base to be adjustably traversable
therein toward and from the optical axis at right
angles thereto, and an article support mounted
The rear side of the assembly is then
presented for inspection with the bottom pair of
corresponding half turns nearly in position in the
?eld of view.
The rear turns are preferably in
spected from bottom to top in same manner that ' on the carrier to be rotatable thereon about the
axis of motion thereof with respect to the sup
the front turns were inspected from top to bot
port base.
tom. The operator will not then forget to in
2. In an optical device for observing and hold
spect both sides, knowing that when a piece of
work is all the way up, it is only half done.
10 ing articles to be adjusted and having an optical
system for observing an article, a, support base
It will be noted that the apparatus as described
rigidly mounted beside and spaced from the opti
combines, as basic components, an optical sys
cal axis of the system, a support carrier mounted
tem comprising the lens 40 and the screens or
in the support base to be adjustably traversable
optical diaphragms 36 and 39, together with the
article support means which is capable of being 15 therein toward and from the optical axis at right
angles thereto, and an article support mounted
adjusted to traverse an article thereon across the
onthe carrier to be rotatable thereon about the
optical axis of the optical system and also to
axis of motion thereof with respect to the sup
rotate the support and article, independently of
port base, together with means to yieldingly lock
the traversing motion, about ,an axis perpendic
ular to the optical axis, into two predetermined 20 the article support on the carrier in eith'er of two
angularly spaced positions thereon.
positions 180° apart in either of which the sup;
3. In an optical device for observing and hold
port is yieldingly locked; The number of posi
ing articles to be adjusted and having an optical
tions thus provided for, is two in the particular
embodiment chosen to illustrate the invention,
because the grid assembly to be dealt with has
two aspects to be considered. In other instances
the article in question might have three or four
or even more aspects, in which case a corre
system for observing an article, a support base
rigidly mounted beside and spaced from the opti
cal axis of the system, a pinion mounted in the
support base, a rack housed in the support base
and engaging the pinion to be traversable there
by toward and from the optical axis at right an
sponding number of indentations 5| to receive
the ball latch 58 would be provided.
30 gles thereto, and an article support pivoted on
the rack to be rotatable thereon about the axis of
The invention has been illustrated as embodied
motion thereof.
in an apparatus for holding a particular grid as
4. In an optical device for observing and hold
sembly in and adjustably moving it across an
ing articles to be adjusted and having an optical
illuminated, limited ?eld of View to facilitate in
spection and adjustment of correlated turns of 35 system for observing an article, a support base
rigidly mounted beside and spaced from the op
windings; but the invention is believed not to be
tical axis of the system, a pinion mounted in the
so limited. Modifications and variations to adapt
support base, a rack housed in the support base
it to other types of articles to be examined are
and engaging the pinion to be traversable there
believed to be obvious to those skilled. in the art
and to come within the spirit and scope of the 40 by toward and from the optical axis at right an
gles thereto, and an article support pivoted on
invention as particularly described and pointed
the rack to be rotatable thereon about the axis
out in the appended claims.
of motion thereof, together with means to yield
What is claimed is:
ingly lock the article support on the carrier in
1. In an optical device for observing and hold
ing articles to be adjusted and having an optical PA U! eith'er of two angularly spaced positions thereon.
VINCENT G. JARMAN.
system for observing an article, a support base
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