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Патент USA US3085331

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April 16, 1963
s. A. DOUGLAS
3,085,321
TAP SETTER
Filed Nov. 5, 1958
_
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2 Sheets-Sheet 1
April 16, 1963
s. A. DOUGLAS
3,085,321
TAP SETTER
Filed Nov. 5, 1958
2 ‘Sheets-Sheet 2
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7
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24
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United States Patent 0
1
3,085,321
Samuel Arthur Douglas, Endicott, N.Y., assignor to Gen
TAP SETTER
CC
$385,321
Patented Apr. 16, 1963
2
and improved portable machine for rapidly and accu
rately applying taps to variable resistor elements.
It is a further object of this invention to provide a new
and improved apparatus for applying removably posi
eral Precision Inc., Wilmington, DeL, a corporation of 5 tioned
taps and potentiometers and for electrically check
Delaware
ing the positioning of the taps so applied.
Filed Nov. 5, 1958, 5st‘. No. 772,073
Further objects and advantages of this invention will
7 Ciainis. (Cl. 29—2tl3)
become apparent as the following description proceeds,
This invention relates to instruments for assembling
which description should be taken in conjunction with
electrical appliances, and, more particularly, to devices 10 the accompaying drawings, in which:
for applying taps to assembled potentiometers.
FIG. 1 illustrates, in perspective, the device of this in
Resistors, both ?xed and variable, are well known
vention;
electrical components which have been in use almost as
FIG. 2 is a sectional view of the apparatus illustrated
in FIG. 1;
resistors were fashioned haphazardly from any substance 15
FIG. 3 is ‘a plan view of a portion of the device shown
which would produce the desired eifect, and their use
in FIG. 1;
was primarily for rough adjustment of the current ?ow
FIG. 4 is an elevational view of a portion of the device
or potential in a circuit. As the science of electricity
of FIG. \1 shown enlarged; and
developed, so did the need for more accurate resistors and
FIG. 5 is a perspective view of portions of the device
long as electricity itself has been utilized. Originally
for more effective and improved methods of manufactur 20 illustrated in FIG. 4.
Referring now to the drawings in detail, the reference
As new resistor compositions were developed, they
character 11 designates a generally circular base which
ing them.
were used for variable as well as ?xed resistors, for the
supports a centrally split ring portion 12 adapted to carry
uses of components in which the resistance could be varied
a potentiometer 41 to which taps are to be applied. The
over a range of values were growing. However, it was 25 ring '12 is split at one side 13, and the portions on either
not until the use of analog computers for both training
and control became widespread that the demand for po
tentiometers of great accuracy and precision grew to great
proportions. With the present emphasis upon electrical
and electronic training aids and control systems for oper
ating everything from garage doors to ‘guided missiles,
the use of potentiometers has become great. And the
potentiometers required for modern appliance-s must be
side of the split 13 comprise legs 15 and 16 through which
is threaded a clamping set screw 14. An annular portion
1'7 is supported by the base 11 for rotation in a depres
sion formed therein. A base portion 18 of an upright
support member 23 is mounted on the annular portion 17,
and the annular portion 17 is surrounded by a ring-shaped
scale member 19 which is affixed to the base 11 by means
of screws 21. A knurl headed screw 22 is threaded into
precision instruments.
the ‘base 11 through the scale 19 for clamping the ring
Since the growth of resistors has been of both the fixed 35 portion 17 into any ?xed position.
and ‘the variable types, it has become evident that the
The upright support member 23 carries on its upper
combining of both functions in a single device would
portion an L-shaped lever arm 24 having a cylindrical
greatly increase its versatility and aid in the reduction in
plunger member 25 fastened to its upper horizontal por
the size and complexity of circuits in which it was used.
tion. Surrounding the cylindrical plunger 25 is a coil
This is especially true of large machines such as modern 4.0 spring 26 so arranged as to maintain the lever arm 24
aircraft training systems. The simulation on the ground
in a raised position. The lower end of the vertical por
of the operations of the multitude of parts in an aircraft
tion of the lever arm 24- carries a tap setting member 27
in response to actions of a pilot trainee requires analogue
having a spring portion 28 therein. The lever arm and
computers which utilize large numbers of both ?xed and I, the tap carrying assembly are supported in an appro
priate groove in the support member 23 and are con
variable resistors. For accurate and lifelike simulation,
precision components must be used, and the cost of such
tained therein by a face plate 20‘ removably attached
equipment, as well as the space required thereby, is
thereto. An arm 31 having a cylindrical handle portion
great.
32 is rotatably supported on one side of the base mem
In an eifort to overcome these problems, potentiom 50 ber 23 by means of a pivot screw 33. The extreme end
of the arm 31 has a notch 34 fashioned therein with
eters of high accuracy have been developed. These po
diver-gent outer portions for receiving the pin projection
tentiometers are designed to be stacked and to operate
of a potentiometer wiper arm. A wrench 38 is used for
in ‘ganged groups to standardize their production and so
adjusting the clamping set screw 14 to ?xedly attach or
reduce the cost of manufacture and the space require
remove a potentiometer 41 to the apparatus, and a wooden
ments. In addition, taps can be applied to the potenti
cylinder 39 having tapered end portions is used to adjust
ometers to provide ?xed resistance values and eliminate
the need for many ?xed resistors. However, the taps
must be applied to the potentiometer with an accuracy
of the same order as that of the original potentiometer,
or remove the taps from the potentiometer.
-
As shown more clearly in the enlarged view of FIG. 5,
the end portion 27 of the lever 24 comprises a hollow
body portion 36 which tapers outwardly and upwardly
and the taps should be capable of rapid and simple re 60 from a knife edge to a shoulder portion 37. The inner
placement by equipment that can be easily used in the
vertical surface of the body 36 has a keyhole slot 35 cut
?eld as well as in the manufacturing plant. By such
therein through which a portion of the spring member 28
means, the number of different resistors required by many
can be seen. Shown in FIG. 2 is the potentiometer com~
installations can be materially reduced, reducing the size
prising a housing 41 having a resistance element 42
of inventories and of necessary storage space. Also, re 65 mounted therein about the inside circumference of the
sistance values could then be changed without expensive
housing. The base member 43 of the potentiometer has
dismantling of complex equipment and the replacement
an upwardly projecting portion 44 about which is the
of expensive parts.
U-shaped portion 45 of a ?xed tap. At one end of the
It is an object of this invention to provide a new and 70 ?xed tap adjacent the resistance element 42 is a sharp,
improved device for applying taps to electrical appliances.
pointed contact element 46, and a connecting wire (not
It is another object of this invention to provide a new
shown) is fastened to the opposite end 47 of the tap.
3,085,821
.
4
3
Mounted on a shaft (not shown in FIG. 2) which passes
through the housing 41 is a wiper arm 438 which carries
the sliding contact elements of the potentiometer. Also
carried by the potentiometer housing 41, although not
shown herein, is a device to which the individual ?xed tap
and the contact elements of the potentiometer may be
connected for connection to external devices. The pin
1y at any time to compensate for manufacturing varia
tions and maintain with precision relative resistance values
between the ends of the resistance element 42 and the
?xed taps 46.
Since the tap elements are held into position by the
friction exerted against the projecting portion 44 of the
potentiometer housing and the U-shaped portion 45 of
the tap itself, the taps may be readily removed by prying
49, at one end of the contact arm 43, is shown in FIG. 2
loose with the tapered cylindrical member 39‘ for em
in operative relation to the notch 34 in the end of the
arm 31. Also shown in FIG. 2 is the manner in which 10 placement in a different location or for adjustment pur
poses. In this manner the necessary inventory which must
the cylindrical plunger is attached to the arm 24» and in
be carried by a laboratory or other such organization
which the coil spring 26 surrounds the cylindrical plunger
which may require periodically changing resistance ele
25 and is inserted in a cylindrical opening 51 in the up
ments may be greatly reduced. The potentiometer 41
right support 23.
‘In operation, the potentiometer housing 41 is mounted 15 may be standardized and produced with great accuracy
in large numbers and in a Wide variety of sizes, and the
in the split ring 12 such that, with the index 52 on the
application of the taps accurately by the device illustrated
annular portion 17 at the zero position, one end of the
resistant element 42. of the potentiometer is directly under
and described herein may produce an in?nite number of
the V-notch in the spring member 28. In this position the
changeable resistance relationships to produce versatile
clamping set screw i4 is rotated by means of the wrench 20
equipment.
38 to lock the potentiometer into position. The knurled
screw 22 is released so that the annular ‘portion 17, the
This speci?cation has described a new and elfective de
vice for rapidly and easily removably applying ?xed taps
to potentiometers and other such portable electrical ap
upright support 213 and the associated elements carried
pliances. Since this description may suggest to those
thereby may be rotated with respect to the potentiometer
41 and with the scale :19. A tap is then inserted between 25 skilled in the art other forms which this invention may
the spring member 28 and the back portion 27 of the
take, it is intended that this invention be limited only by
nose portion 36, with the pointed contact element 46 in
the scope of the appended claims.
the keyhole slot 35. The spring 28 releasably holds the
What is claimed is:
tap in position against the back wall 2'7 of the nose por
1. Apparatus for applying attachments to electrical ap
tion 36. The annular portion 17, together with the up 30 pliances, said apparatus comprising a base of substantially
circular shape, an annular member rotatably mounted
right support 23, is then rotated until the index 52 indicates
the angular position at which a tap is to be inserted in the
on said base, the plane of said annular member being
potentiometer, and the knurled headed screw 22 is hand
parallel to the plane of said base, a support member per
tightened to hold the rotating portion in that position.
pendicular to the plane of said annular member and
The upper portion of the lever arm 24 is then depressed 35 mounted thereon, means attached to said base in the cen
ter portion of said annular member for clam-ping an ap
against the action of the spring 25 to force the tap into
the potentiometer housing so that the U~shaped portion
pliance into a ?xed position in which its axis coincides
45 of the tap resiliently clamps around the projection 44
with the axis of rotation of said annular member, vertical
ly movable means mounted on said support member and
within the housing. The pointed contact element 46
then makes contact with the resistance element 42‘. When 40 biased to an upward position, a resilient holding mem
ber supported at the lower end of said vertically mov
‘the lever arm ‘24 is released, it springs back into its upper
most position and the spring member 28 releases the tap
able means for removably holding an attachment, and
so that it remains in the potentiometer housing.
annular scale means mounted about the outer periphery
Additional taps may be readily inserted by releasing the
of said base member for indicating the relative position
locking screw 22 and rotating the annular portion 17 and 45 ing of said vertical support means and an appliance
clamped on said base whereby said attachment may be
the upright support 23 to a new position as indicated by
accurately applied to a preselected location on an ap
the index mark 52. A second tap may then be inserted
pliance supported in said clamping means.
between the springz? and the nose portion 56‘ and inserted
2. Apparatus for applying attachments to electrical
into the proper position in the potentiometer 41. The
scale 1% is calibrated in one degree markings and is posi 50 appliances, said apparatus comprising a ‘generally cir
cular base having an annular depression in a plane sur
tioned around the outer periphery of the base 11 to pro
face thereof, said depression being concentric with said
vide greater accuracy in setting. It is possible to set a
base, a ring seated in said ‘depression and rotatable about
removable tap within one degree of the desired position
its center, an upright support mounted on said ring over
in a potentiometer.
To ensure that the tap has been located in the position 55 a portion thereof, a lever mounted on said upright sup
port for sliding vertical movement, means for biasing
in which it is supposed to be, it may now be checked by
said lever into its uppermost position, means at the lower
the same device which applied the tap initially used in
end of said lever for removably carrying an attachment
conjunction with a resistance measuring instrument. With
to be applied to an appliance, and clamp means attached
the potentiometer 41 still clamped in its initial zero posi
tion, the rotatable contact arm 48 of the potentiometer is 60 to said base for removably clamping an appliance to
which attachments are to be applied in a position in
rotated until the pin portion 49 is directly under the notch
which its axis coincides with the axis of rotation of said
34 in the arm 31. The arm 31 is then rotated about the
axis provided by the screw 33 to engage the pin 49. The
ring.
.
3. Apparatus for applying attachments to electrical ap
lock screw 22 is released and the annular portion 17 and
the upright support member 23 are rotated until the index 65 pliances, said apparatus comprising a base having an
annular depression in an upper surface thereof, a ring
mark 52 indicates the position at which the initial tap
slidably seated in said depression for rotation about the
was applied to the potentiometer. Resistance readings are
center of said ring, releasable means for holding the
then made between the end of the potentiometer and the
ring in a desired position, a support member mounted
lead from that particular tap, and, if necessary, the tap
is moved slightly by means of the tapered wooden cylin 70 on said ring, clamp means a?ixed to said base to re
movably clamp an appliance in a ?xed position in which
der 39 until a null reading is indicated by the meter. This
its axis coincides with the axis of rotation of said ring,
procedure is repeated for each tap so applied to the po
means carried by said support member for applying an
tentiometer until all of the taps have been situated ac
attachment to an appliance held in said clamp means,
curately within the potentiometer. By this means it is
and a scale surrounding said ring for use in determining
possible to adjust the electrical positions of the taps slight
3,085,321
5
6
the circumferential location on said appliance at which
an attachment will be applied by said means carried by
the support member.
4. Apparatus for applying removable, ?xed taps to a
potentiometer, said apparatus comprising a base, a ring
rotatably mounted at the upper surface of said base,
clamp means attached to said base within said ring where
by said ring rotates about said clamp means, a support
member perpendicular to the plane of said ring and
element when said tap is clampingly disposed over said
rail member, said device comprising: a base; vertical
support means mounted on said base; potentiometer hold
ing means mounted on said base; vertically operable, up
wardly spring-biased tap carrying means mounted on said
support means, said tap carrying means being rotatable
about the axis of a potentiometer mounted in said po
tentiometer holding means at such a radius from said
axis as to remain always above a tap mounting rail in
mounted thereon, vertically movable means mounted on 10 said potentiometer; means for ?xing said tap carrying
said support member and biased to an upward position,
means at any desired angular position about said poten
a resilient holding member supported at the lower end
tiometer axis; and means pivotally mounted on said sup
of said vertically movable means for removably holding
port means for holding the wiper arm of said potentiome
a tap to be applied, said clamp means clamping a poten
ter ?xed with respect to said tap carrying means.
7. Apparatus for applying taps to electrical potentiome
tiometer in operative relation to said holding means, an 15
ters of the type which comprise a housing having a
annular scale about the outer circumference of said ring
for indicating the relative circumferential position of
resistance element mounted therein about the inside cir
said holding means with respect to a potentiometer in
cumference thereof and a tap-supporting rail member
substantially concentric with said resistance element over
the clamp means, and releasable lock means for tem
porarily locking the ring and the holding means in a 20 which at least one tap is adapted to be engaged, the end
desired circumferential position.
of said tap remote from said rail member engaging said
5. A device for applying taps to potentiometers of the
resistance element when said tap is clampingly disposed
type which comprise a housing having a resistance ele—
over said rail member, said apparatus comprising: a base
having an annular depression in the top surface there
ment mounted therein about the inside circumference
thereof and a tap-supporting rail member substantially 25 of, a ring slidably seated in said depression, a vertical
support mounted on said ring, a lever vertically mov
concentric with said resistance element over Which at
ably supported by said support, means for biasing said
least one tap is adapted to be engaged, the end of said
lever to its uppermost position, a tap carrier mounted
tap remote from said rail member engaging said resist
ance element when said tap is clampingly disposed over
on the lower end of said lever, and means af?xed to
said rail member, said device comprising: a base; sup 30 said base for clamping a potentiometer in a position to
receive a tap when said lever is moved downwardly.
port means mounted on said base; potentiometer hold
ing means mounted on said base; tap carrying means
References Cited in the ?le of this patent
mounted on said support means, said support means
UNITED STATES PATENTS
being rotatable about the axis of a potentiometer mount
ed in said potentiometer holding means; means for ?xing 35
159,904
Coombe ____________ __ Feb. 16, 1875
said tap carrying means at any desired angular position
about said potentiometer axis; and means mounted on
said support means for holding the wiper arm of said
potentiometer ?xed with respect to said tap carrying
means.
40
6. A ‘device for applying taps to potentiometers of the
type which comprise a housing having a resistance ele
ment mounted therein about the inside circumference
thereof and a tap-supporting rail member substantially
concentric with said resistance element over which at least 45
one tap is adapted to be engaged, the end of said tap
remote from said rail member engaging said resistance
659,626
1,665,926
2,094,517
2,172,847
2,279,611
2,341,176
2,360,115
2,418,209
2,865,089
2,872,723
2,873,509
2,873,516
Pomeroy ____________ .._. Oct. 9,
Hull ________________ __ Apr. 10,
Andreoli ____________ __ Sept. 28,
Nydegger ____________ __ Sept. 12,
Barnhardt __________ .._. Apr. 14,
Buehrig _____________ __ Feb. 8,
Droll _______________ __ Oct. 10,
Watts _______________ __ Apr. 1,
Machian ____________ __ Dec. 23,
Sorber ______________ __ Feb. 10,
Levine et a1. _________ __ Feb. 17,
McCain et al. ________ __ Feb. 17,
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