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Патент USA US3067904

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Dec. l1, 1962
3,067,894
R. G. FISCHER
PICKUP MECHANISM
Original Filed June 25, 1958
3 Sheets-Sheet 1
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Dec, 11, 1962
R. G. FISCHER
3,067,894
PICKUP MECHANISM
Original Filed June 25, 1958 _1
3 SheetsßSheet 2
Dec. 11, '1962
R. G. FISCHER
3,067,894
PICKUP MECHANISM
Original Filed June 25, 1958
3 Sheets-Sheet 3
United States Patent Óflice
2
l
3,067,894
PICKUP MECHANÍSM
Robert G. Fischer, Chatsworth, Calif., assignor to Gen
eral Dynamics Corporation, New York, N.Y., a corpo
ration of Delaware
Original application June 25, 1958, Ser. No. 744,364.
Divided and this application July 6, 1959, Ser. No.
325,090
e3,967,894
Patented Dec. 11, 1962
z claims. (ci. 214-658)
Referring to FIGURES 3 and 4, each Specimen to
be irradiated is made of such a lsize that it may be
inserted into one of the cups 35 of the rotary specimen
rack 29. The specimen container includes a tube 40
that has its bottom end closed. The bottom edge of
the tube 40 may be chamfered to facilitate the insertion
of the specimen container 37 into a cup 35. Attached
to the upper end of each tube 40 by threading, rolling,
crimping or the like, is a lifting extension 41. The
10 lifting extension 4l has a -transverse wall 42 across its
The present invention relates generally to a pickup
mechanism and more especially to a pickup mechanism
particularly adapted for lifting engagement with the in
terior of an associated container.
lower end which provides a closure for the upper end
of the tube 40 and has a vertically extending tubular
wall 43. A head portion 44 is threaded, crimped, or
otherwise joined to the upper end of the tubular wall
This application discloses a particular pickup mecha 15 43. The head portion 44 slopes downwardly and in
wardly from the tubular wall 43 and terminates in a
nism designed for delivery and removal of specimen con
substantially horizontal lower shoulder or flange 45
tainers to and from a neutronic reactor such as that
which extends outwardly to the wall 43. The head
shown in application, Serial No. 744,364, filed on June
portion 44 is adapted for engagement with a coacting
25, 1958, entitled, “Neutronic Reactor.” However, it
pickup mechanism 46.
`
'
Should be understood that the disclosed pickup mecha
nism has wide application in many other fields and is
The pickup mechanism 46 is used to deliver the speci
not limited for use in connection with the delivery and
men containers 37 to and to remove the specimen con
removal of containers from a neutronic reactor.
tainers 37 from the cups 35 of the rotary specimen rack
Accordingly, the principal object of the present inven
29. In the illustrated embodiment, the pickup mecha
tion is a new and improved pickup mechanism. Other 25 nism 46 includes a cable 47, a cable >clamp 48, an elec
objects and advantages of the present invention will be
tric solenoid 49 and a pickup linkage 50. A suitable
apparent from a study of the following detailed descrip
specimen container hoist 51 (see FIGS. l and 2) posi
tion and the accompanying drawings in which:
tioned above the top of the reactor tank 22, is used to
FIGURE l is an elevational view of a neutronic re
lower the containers 37 into and raise the containers 37
30
actor in connection with which the ydisclosed pickup
from the cups 35. The solenoid 49 which may be of
mehcanism is disclosed;
standard construction has an over-all diameter less than
that of the delivery and removal pipe 38. The cable
FIGURE 2 is a perspective view of a pickup mecha
47 performs the dual function of furnishing electric
nism in accordance with the present invention;
power to the solenoid and providing a means of raising
FIGURE 3 is an enlarged side view of a portion of
and lowering the pickup mechanism 46 The cable 47
the pickup mechanism in engagement with a supported
is mechanically supported by the cable clamp 48 which
container located in an elongated pipe; the container
is attached to the top of the solenoid 49. The cable
and pipe being illustrated in cross section; and
clamp 48 is composed of top and bottom ñange mem
FIGURE 4 is a view similar to that shown in FIG
URE 3 but with the pickup mechanism rotated 90° with 40 bers S2 and 53 and a common web member 54. The
bottom flange member 53 has a hole through its center
respect thereto.
and a transversey groove on its bottom surface through
_Now referring more particularly to the reactor illus
which the cable 47 is threaded for electrical attachment
trated in the drawings, the reactor, designated by the
t0 the solenoid. The top flange member 52 ofthe clamp
reference numeral 20, includes a core 21 disposed near
the bottom of a reactor tank 22 which is located in a
pit 23 and is ñlled with a liquid 24. 'I'he core 21 in
cludes a plurality of fuel elements 25.
Disposed in
48 is in two sections and has a centrally located hole
55' of a diameter less than that of the cable 47. The
cable 47 is placed between the two sections and the
the core 21 are control rod assemblies 26 which are
sections are fastened together, thus compressing the
operated by suitable winch mechanisms 27 located above
cable 47 .
'
the reactor tank 22. A reflector 28 encircles the core 50
The pickup linkage 50 includes two parallel outer arms
21. Various irradiation facilities including a movable
56 attached at their upper ends to the casing of the sole
specimen rack 29 are provided in the core 21 and re
noid 49, and two movable linkages 57 inside of the outer
flector 28, for irradiating specimens at preselected radia
arms 56 pivotally mounted to the lower end of an out
tion levels. A horizontal shelf 30 is preferably pro
vided at the upper end of the pit 23 for the mounting
of the control rod winch mechanisms 27. The sur
face of the shelf 30 is at a suiiicient depth from floor
level 31 to acco-mmodate the height of the winch mecha
wardly spring biased plunger 58 within the solenoid 49
and to the lower end of the outer arms 56. The movable
linkages 57 are each composed lof two arms 59 and 60
pivotally joined together intermediate the solenoid 49
and the lower ends of the outer arms 56. When the
nisms 27. A channel 32 may be attached to the con
solenoid 49 is deenergized the junctions between the
crete at each edge of the perimeter of the shelf 30 for 60 lower and upper arms 59 and 60 of the movable link
support of a cover 33 over the pit 23.
ages 57 will extend outwardly in opposite directions to
approximately the inside .diameter of the lifting extension
. The specimen rack 29 is enclosed in a liquid-tight
41. In this position the upper ends of the lower arms
housing 34 located partially in the reflector and includes
59 have flat horizontal surfaces 61 which are engageable
a plurality of spaced cups 35 which are attached to and
extend below a ñat horizontally extending rotatable ring 65 by the flange 45 of the head portion 44 of the lifting ex
tension 41. When the solenoid 49 is energized, the
36. The cups 35 serve as holders for specimen con
plunger 58 moves upwardly, which reduces the outward
tainers 37 and are accessible through a delivery and re
extension of the ljunctions between the lower and upper
movable pipe 38 extending upwardly from the hous
arms 59 and 60 as as to allow the pickup linkage 50
ing 34. Suitable means for driving and locating the
rack 29 in relation to the delivery and removal pipe 38 70 to pass inside the head portion 44 ofthe lifting ex
tension 41.
extend through a tube 39 which extends upwardly from
In operation, the pickup linkage 50 is inserted into the
the housing 34.
3,067,894
3
lifting extension 41 either by manually pressing the pick
up linkage into the lifting extension or by temporarily
energizing the solenoid. 49'and then dropping the pickup
linkage into the lifting extension, after whichthe speci
A
an average pitch diameter of 4 inches on the reel 63, the
resulting speed of the cable 47, and thus the container
37, was approximately 55 inches per minute.
The base plate 67 is mounted on the upper cross mem
men container 37 may be lowered through the delivery
ber 71 of a generally T-shaped support 72 which is rotat
and removal pipe 38 into one of the cups 35 of the
specimen rack 29. The solenoid 49 is energized and
the pickup linkage 50 is removed from the lifting ex
ably mounted to one of the channels 32, which forms one
tension 41. The height of the specimen container 37
should be such that when a plurality of containers 37
Aare inadvertently stacked one above the other in the
zontally disposed, rectangular plate which is fastened to
an upright pipe or tube 73 by means of a pipe iiange 74
of the edges of the shelf 30 at the upper edge of the reac
tor pit 23. The cross member 71 is a flat, elongated, hori
which is mounted to its lower surface by means of bolts
or the like. An overhanging arm 75 which supports a
sheave 76 at its outer end extends transversely from the
cross member 71 of its T-shaped support 72. The over
ring 36. The process is reversed for removal of a speci
hanging arm 75 may be any suitable structural member
men container 37 from the rack 29. However, the bias
such as a rectangular conduit, angle bar, channel member,
on the solenoid’s plunger 58 may be in such a relationship
or the like. In the illustrated embodiment, the overhang
to the weight of the pickup mechanism 46 that the plunger
ing arm 75 is composed of a generally rectangular con
58 will be forced upwardly when the pickup mechanism
duit which has a slot (not shown) in its lower surface ad
46 is lowered into contact with the ’specimen container 37.
In this manner the pickup mechanism 46 will enter the 20 jacent its outer end. The sheave '76 is mounted in the
outer end of the overhanging‘arm 75 and partially within
Ispecimen container 37 without the necessity of energizing
the slot by means of a forked support 77 so thatthe shaft
`the solenoid 49.
delivery and removal pipe 38 and underlying cup 35,
they will not interfere with the subsequent rotation of the
Referring to FIGURE 2, the specimen container hoist
78 which supports the sheave 76 extends horizontally. As
shown in FÍGURE 2, the shaft 78 is disposed in suitable
51 includes a drive motor 62, a reel 63 rotatably con
-nected to the drive motor 62 through a speed reducer 64, 25 holes adjacent the ends of the arms of the forked support
77. The forked support 77 is fastened to the inner‘surface
and a limit switch mechanism 65 connected to the reel
of the lower side ofthe overhanging arm 75 by bolts or
63 through a speed increaser 66. These components are
similar means. The T-shaped support 72 is rotatably
arranged in a line on a base plate 67, which is suitably
mounted so that the overhanging arm 75 may be swung
`mounted alongside the `reactor tank 22. All of the com
from its normal position overlying the reactor tank 22 to
ponents of the specimen container hoist 51 are commer
a position on one side thereof for easy accessibility into
-cially available and are not explained in detail.
the interior of the reactor.
As previously indicated, the cable 47 which is attached
to the solenoid 49 of the specimen container pickup
The base plate 67 of the specimen container hoist 51 is
suitably mounted in a centrally located slot 79 in the
‘mechanism 46 delivers electric power to the solenoid 49
`and at the'same time supports the specimen container 37 35 upper surface of the cross member 71'by means such as
rotatable clamps 80. A housing 81 which is seated around
:as it is lowered and raised. This eliminates the need for
the perimeter of the cross member 71 may be provided
separate cables for power and for support purposes.
for enclosing the specimen container hoist 51.
The cable 47‘is received by the reel 63, which is provided
The lower end of Vthe upright pipe 73 is rotatably
with brushes and commutators so as to maintain electrical
-connection to a power source (not shown) as the reel 63 40 mounted in a circular recess 82 in the upper surface of a
is rotated.
The reel 63 is suitably hung from an overhanging arm
'68 of a C-shaped support 69. The C-shaped support 69
is attached by its lower arm 70 to the base plate 67 by
generally rectangular base support S3.
An elongated
cylindrical support rod 84 of a diameter just less than
that of the upright pipe 73 extends upwardly from the bot
tom of the recess 82 into the lower portion of the upright
pipe 73 to provide added support'for the upright pipe 73.
bolts or lsimilar means. One end of the shaft of the
reel 63 is connected by means of a iiexible coupling to 45 The base support 83 is suitably attached, as by welding
or the like, to the web of one of the channel members 32,
vlthe output shaft of the speed reducer 64, which reduces
which forms one side of the shelf 30. The upper flange
the speed of the drive motor 62 so that the cable 47 is not
of the channel member 32 is cut away, and the lower
4wound or unwound at too great a speed. The input‘shaft
surface of the base support 83 is notched so as to allow the
yof the speed reducer 64 is connected to the drive motor
62 which is mounted to the base plate 67.
50 base support 83 to be abutted against this web.
A movable locking member 85 is‘provided on the upper
The other end of the shaft of the reel 63 is connected
surface of the base support S3 for preventing the rotation
to the input shaft of the speed increaser 66 by means of
of the T-shaped support 72. Thelocking member 85 in
a flexible coupling. The speed increaser 66 is mounted
cludes a horizontally extending ñnger 86 which is slidable
on a support suitably fastened to the base plate 67. The
into and out of engagement with a suitable hole 87 in the
output shaftofthe speed increaser 66 is connected to the
»side wall of the upright pipe 73. The locking member 85
:limit switch mechanism 65 by means of a flexible coupling.
is adjustably attached to the base support 83 by means of
The limit switch mechanism 65 is mounted to the base
Aa pair of bolts 88 which extend through a slot 89 in the
.Aplate 67 by means of bolts or the like. The speed in
creaser 66 isiprovided in order that the accuracy of the
locking member 85.
.adjustment of the limit switch mechanism 65 is within 60 This application is a division of application, Serial No.
the tolerance necessary for proper operation of the speci
744,364, filed `lune 25, v1958, and entitled “Ncutronic
Reactor.” Various features‘of the invention are set forth
men container hoist 51.
The limit switch mechanism 65 is connected into the
in the appended claims.
`drive motor'circuit (not shown), so as to deenergize the
I claim:
1. A pickup mechanism‘for specimen cans disposed in
-motor 62 and thus limit the travel of the cable 47. Gen 65
a vertically extending, velongated tube extending into a
Aerally, the limit switch mechanism 65 ir set so as to de
energize the motor `62 either when the specimen con
nuclear reactor, comprising an elongated electrical cable,
tainer 37 is fully inserted into the cup 35 of the rotary
a solenoid electrically connected to one end of said cable,
means mechanically connecting said solenoid to said cable
jspecimen rack 29, or lwhen the specimen container 37 is
«raised‘to a desired- position outside the reactor tank 22. 70 so that said cable solely supports said solenoid and any
In one'embodiment of the invention the drive motor
specimen can carried thereby, said solenoid having a hori
.62 was ‘an instantly reversible, single phase, non-syn
zontal cross section which is less than the internal diam
eter of said tube, winch means connected to the other end
chronous motor with a speed of approximately 1750
of said cable for raising and lowering said solenoid and
r,p.m. Using a speed reducer 64 having a speed reduc
tion of 60 to 1 with the 1750 r.p.m. motor, and having 75 for supplying electrical energy thereto, a plunger extend
3,067,894
5
ing axially of said solenoid, said plunger moving up
wardly upon actuation of said solenoid, a spring biasing
said plunger downwardly, and link means pivotally se~
cured to said plunger, said link means including a iixed
member extending downwwardly from said solenoid, and
a pair of opposed links, each of said links including an
engaging link and a connecting link, said engaging links
being pivoted at _their lower ends to the lower end of
said solenoid in said tube and for supplying electrical
energy thereto, a plunger extending axially of said sole
noid, said plunger being moved upwardly in said sole
noid upon .actuation of the same, said plunger being
spring biased in a downward direction, and link means
connected to said solenoid, said link means including a
pair of spaced apart, parallel fixed members extending
downwardly from said solenoid on either side of said
plunger, the upper ends of said ñxed members being
their upper ends, and being pivotally connected interme 10 formed to provide inwardly directed shoulders which
diate said engaging shoulder and said lower ends with the
serve as a stop for said plunger, and a pair of opposed
lower ends of said connecting links, the upper ends of
pairs of links, each of said opposed pairs of links includ
said connecting links being pivotally connected to the
ing an engaging link and a connecting link, said engaging
lower end of said plunger, said load~engaging shoulders
links ibeing pivoted at their lower ends to and between
being movable from a laterally outwardly extending, load 15 the lower ends of said iixed members, having engaging
carrying position when said plunger is in its downward
shoulders adjacent their upper ends, and being pivotally
most position to a retracted position when said plunger is
connected intermediate said engaging shoulder and said
moved upwardly by said solenoid, said downwardly biased
lower ends with the lower ends of said connecting links,
condition of said plunger being such that said engaging
the upper ends of said connecting links being pivotally
shoulders move toward their retracted position by passage
connected to the lower end of said plunger, said engaging
through an opening in the specimen can having a width
shoulders being movable from a laterally outwardly ex
less than the maximum distance between said engaging
tending position when said plunger is on said stop to a
links when in their extended position and greater than the
retracted position when said plunger is moved upwardly
maximum distance between said engaging links when in
by said solenoid, said downwardly biased condition of
their retracted position, the distance between said engag 25 said plunger being such that said engaging shoulders
ing links when in their extended position being less than
move toward their retracted position by passage through
said fixed member, having engaging shoulders adjacent
the internal diameter of said tube.
2. A pickup mechanism for specimen cans disposed
in a vertical extending, elongated tube extending in a
an opening in a specimen can having a width less than
the maximum distance between said engaging links when
in their extended position and greater than the maximum
nuclear reactor, comprising an elongated electrical cable 30 distance between said engaging links when in their re
including a conductor and surrounding insulation, a cylin
tracted position, the distance between said engaging links
drical solenoid electrically connected to one end of said
being less than the internal diameter of said tube.
cable, said solenoid having a diameter less than the
internal diameter of said tube and including clamping
References Cited in the tile of this patent
means mechanically connected to the insulation of said 35
UNITED STATES PATENTS
one end of said cable to support said solenoid and any
Rea _________________ __ Dec. l5, 1942
specimen can carried thereby, winch means connected
2,305,320
Carlson ______________ _.. Feb. 28, 1956
to the other end of said cable for raising and lowering
2,736,600
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