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Патент USA US3045645

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July 24, 1962
l D. R. SMITH Erm.
lFiled April 5, 1961
S'Sheets-Sheet 1
19-1 ,
July 24,1962
nf. R; SMITH Erm,
3 Sheets-Sheet 2 ì
' Filed- April 5, 1961 ‘
_ _ _ _
July-.12.42 1962
3 Sheets-Sheet 3
Filed April 5, .1961 ì
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United StatessPatent C)
of the rollers 14 and 15 respectively.
the Iline 2-2 of FlGUREl, the tow arm 18 is shown
fully engaged in the throat block 13, the interior por-v
tion 19 of the throat block 13 being shaped to conform
Filed Apr. 3, 1961, Ser. No. 100,335
vClaims priority. application Canada Aug.' 31, 1960'
4 Claims. (Cl. 114-235)
The'prcsent invention relates to apparatus for stowing
FIGURE 2 shows the throat block 13 in section along
Queen in right of Canada as represented by the Minis
a towed body aboard a vessel.
Patented July 24, 1962l
ter of National Defence
i to deflect the cable into the throat block 13. To facili-h
_ tate this the throat' block 13 is provided with faces 16
and 17 which are angled to be parallel with the axe
Nova Scotia, Canada, " assignors to Her Majesty the
with the shape of_ the tow arm 18, The pin hole 20
.lgsgirovided through the tow arm 18 and in registry with
corresponding holes in the throat block 13. A cam
switch 21 is positioned adjacent the opening 19 in the
In variable depth sonar apparatus a body is'towedastern the vessel in which the sonar transducer and as
throat block 13 and is adapted to be operated when the '
sociated equipment is used. When the sonar equipment
causes an electrical circuit to be opened.
tow arm' 18 is »fully seated in the throat block 13 and
The cam 21
plished by maintaining tension of the towing cable to
. is spring loaded by a spring 22. The plurality of openings
23 are provided in- the throat block 13 in which heating
elements may be positioned to heat the throat block and
prevent the tow arm from freezing‘into the throat block,
heavier the cable tension required becomes very large.
Locking with forks is also not suitable for large, heavy
tion of the locking pin. The locking pin 24 is shown
schematically as passing through the throat block 13
is not in use the towed body must be stowed aboard the
Donald R. Smith and William A. Gibson, Dartmouth,
According to present knowledge this may be accom'
hold the body in a saddle or by clamping the body with 20 or the locking pin being frozen in its locked position.
FIGURE 3 shows the schematic diagram of the elec
movable forks. Locking by maintaining cable tension
trical and hydraulic circuitry associated with the opera
has limitations in that as the body becomes larger and
o th'ë’b'ody having a`t`owirig" cableñxîd
25 and the tow arm 18. The cam switch 21 actuates a
,solenoid 25 to which is connected a hydraulic valve 26.
This valve controls the flow of hydraulic fluid from an
accumulator 27 and pump 28 to a hydraulic cylinder
throat block and lock the tow arm in the throat block.
move to the left and force the iocking pin int'o the ex
The present inventor has found a way of clamping
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`thereto., a thröiit‘blo'cií’?nöunted o'n`the`ï/“e`s'sêl’ahd`ad`ap'ted 30 29 which may retract the locking pin 24. In the posi~
tion as shown-in FIGURE 3 the valve 26 is positioned
to receive the tow arm and a locking pin adapted to
to cause the piston 30 in the hydrauliccylinder 29 to
pass through the opening in the‘tow arm and in the
A feature of the present invention is that the locking pin
tended position. The operation of the locking pin is also
is actuated by a spring and a hydraulic piston and must
effected by means of the spring 31. When the switch
21 is open the solenoid 25 causes the hydraulic valve
26 to move to a position in- which the locking pin is
engaged with the throat block and the tow arm. The
switch 21 is opened by the tow arm seating in the throat
40 block 13. A switch 32l is provided for retracting the
be retracted against the force of this spring. If for any
reason the associated equipment for retracting and ex
tending the locking pin should fail the pin will remain
in the locked position, held there by the spring. Further,
,in accordance with a feature of the invention a switch
is provided whichis operated by the locking pin in its
extended position to extinguish the warning light,»which
indicates that the locking pin is completely seated. A
further feature of the invention is the provision of a
switch mounted in the throat block and adapted to be
locking pin and when this switch is closed the solenoid
is operated causing the valve 26 to move to a position
which results in the piston 30 of the hydraulic cylinder
29 being moved to the right and the locking pin being
In order to actuate the solenoid 25 a battery
33 is included inthe circuit.
A warning light switch 34 is included in the throat
block 13 and this switch 34 is normally closed causing
tion of the switch causing the release of the locking pin
the warning light 35 to -be lit. When the locking pin
which is moved into the locking or extended position
by the spring and the hydraulic piston.
50 24 is fully engaged through the throat block 13 and
tow arm 18 the warning light switch 34 is opened and
In drawings which illustrate an embodiment of the
the light 35 extinguished indicating that the locking pin
is fully extended.
>FIGURE 1 is a plan view of the towing apparatus
If for any reason the locking pin should move after
ñxed to the stern of a vessel for towing for variable depth
it has been extended, then the warning light switch 34
will reclose and indicate that the locking pin is not fully
FIGURE 2 is a vertical section through the throat
operated by the tow arm so that the switch is actuated
when the tow arm is fully seated in throat block, opera
block and tow arm showing the tow arm in the fully
FIGURE 4 shows a vertical section through the lock
ing pin 24, the throat block 13 and a tow arm 18. The
FIGURE 3 is a schematic diagram of the electrical`
and hydraulic circuits for operating the locking pin, 60 warning light switch 34 is shown mounted on the op
engaged position,
posite sides of the throat block from the locking pin 24,
FIGURE 4 is a vertical section through the locking
pin showing the throat block, the tow arm and warning
As illustrated, when the tow arm 18 is fully seated in
the throat block 13 and the hydraulic cylinder 29 condi
light switch.
tioned to extend the locking pm, the spring 31 will drive
FIGURE l shows the towing apparatus which is
the locking pin 24 through the aperture in the throat
mounted at the stern of a vessel for towing a variable
block 13, through the pin 'noie .i0 in the tow arm 18 and
through the aperture on thc fax' side of the tnt-cat block
depth sonar body.
This apparatus comprises a toller
13 into engagement with the warning light switch 34.
The switch will be opened and the warning light ex
'The cable passes over a roller 12 mounted above the 70 tinguished indicating that the locking pin is in its extend
10 mounted on the frame 11 over which the cable C
(shown in dotted lines) passes to a winch, not shown.
throat block 13.' Saddle side rollers 14 and 15 are
mounted on either side of the -throat block and adapted
ing position.
The system is fail safe since the pin 24 is in the locked
3 .
position when the electric power is off. There is also an
accumulator 27 ín the hydraulic circuit to provide emer
gency hydraulic power and to hold the pin 24 in the locked
position. The pin 24 may be retracted by holding closed
' and to lock said tow arm in said throat block, and a
switch positioned in said throat block and adapted to
operate when said tow arm is fully seated in said throat
block, said switch being connected to means for operat~
a switch which overrides the one at the throat block. 5.r ing said- locking pin, operation .of said switch causing
This lmoves the solenoid to retract position. The lock
said locking pin to llock said tow arm to said throat
ing pin will be retracted against the spring by the hy
draulic cylinder and the tow arm will rnove down out
2. An apparatus according to claim l wherein said
of the throat block when the tow cable is payed out.
locking pin is spring actuated, said spring urging said
This releases thel spring- loaded vcam which closes the 10 locking pin into locking position and means are pro
normally closed switch in the throat block. The retract
vided for retracting said locking pin against the depres
switch button can now be released as the electric circuit
sion of the spring.
will remain closed through the cam switch, holding the
3. Apparatus according to claim 2 wherein said re- .
pin in the unlocked position. In case of a failure in
tracting means comprises a hydraulic cylinder actuated
the automatic circuit, a switch can be closed making the >15 by a source of hydraulic pressure, said switch being
circuit non-automatic but still remote controlled. Push
operable to disconnect said hydraulic cylinder from said
ing the retract button and releasing it will cause the pin
source of hydraulic pressure, to cause said pin to move
to the locked position.
to lirst move out and then into the lock position.
We claim:
4. Apparatus according to claim l whereby said throat g
1-. In a_¿'ëâîêblejeattritonarnapparatuwhereinßä 20 block is provided with a plurality of heating elements
positioned longitudinally thereof.
"Vesseij'më‘ans for locking the body in a stowed position
`aboard the vessel comprising a tow arm'ñxed to said
said tow arm, a locking pin adapted to pass through
an opening in said tow arm and in said throat block
References Cited in the ñle of this patent
Rogers _______________ __ June 3, 1952
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