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Патент USA US3095748

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July 2, 1963
w. e. SALO
3,095,738
MARINE SPEEDOMETERS
Filed Dec. 13, 1960
FIG‘I
FIGS
WILLIAM G. SALO
'BY
lmmgzw
A TTORNEYS
United States Patent 0 ” lC€
1
3,095,738
3,095,738
Patented July 2, 1963
2
.
MARINE SPEEDOMETERS
William G. Salo, 6 Crescent St., Spring?eld, Vt.
Filed Dec. 13, 1960, Ser. No. 75,573
2 Claims. (Cl. 73--181)
a?ixe‘d to the upper portion 12 is a compression spring
30. With the speedometer in its retracted position,
shown in FIGURE 5, the upper movement of the tube
is limited by a clamp 32 attached to the tube 10 at a
position below bracket 18 such that clamp 32 and bracket
18 are in contact at the desired upper limit of movement
‘ This invention relates to improvements in means for
to clear the bottom of the boat preventing damage to the
measuring the speedof a vehicle in a ?uid body and in
speedometer when the boat is out of the water. When it
particular to an instrument for determining the speed of
is desired to project the tube into its operative position,
a power boat traveling through water.
10 spring 30 is compressed and the lower tube position 14
In speedometerswhich are to be used on a boat to
is hooked beneath the stern of the boat and aligned by
measure the relative velocity of the water with respect
a notched bracket 46 for holding the speedometer in its
to the movement‘of the boat, it is desirous to employ as
operative position. By appropriate manipulation of han
few ‘moving parts as possible and to provide an arrange
dle clamp 28 which also serves as a direction indicator,
ment whereby the speedometer may be positioned to be 15 the opening of lower portion 12 may be directed towards
operative while the boat is in the water but clear of a
the bow of the boat. As the boat begins to move, Water
position where it may be damaged when the boat is re
enters portion 14 through a ?ow control bushing 34
moved from the water for repairs or trailing. Accord
provided with an ori?ce 35 of a selected diameter. The
ingly, this invention provides an improved marine speed
moving fluid within the tube strikes a piston 36 located
ometer which in its operative position during movement 20 in the upper portion 12 of the tube. Attached to the
of the boat gives accurate readings of velocity and which
piston is a calibrated rod 38 which extends beyond the
may be retracted from its operative position to prevent
open end of the upper portion 12 through a bushing 40.
injury due to dragging when the boat is out of the water.
Drilled in the upper portion 12 of the tube 10 are a plu
The improved speedometer further provides an ar
rality of vertically arranged holes 42 through which the
rangement whereby the flow of water into the device is 25 water in the tube escapes. These holes, while shown as
controlled in accordance with the range of speed at which
being of equal size and spacing, may be of varied shape,
the device is to be operated.
size and spacing to function in relationship with the se
The need for springs required in prior art devices to
lected ori?ce 35 to control the water pressure and to pro
bias the indicator actuator against water pressure is also
vide a linear calibrating scale within the range of speed
30 of operation. -As the speed of the boat increases, the
eliminated by this invention.
Brie?y the invention consists of a generally L-shaped
?ow through ori?ce 35 increases resulting in the piston
tube, the lower end of which in its operative position is
36 being driven upwardly a greater distance. As a re
directed towards the bow of the boat. As the boat moves
sult, the calibrated rod 38 is exposed to a greater extent
through the water, the liquid enters the submerged end
and may be read directly by the operator. When the
of the tube forcing a piston located therein upwardly.
boat is motionless, the rod is prevented from sliding com
To this piston is attached a calibrated rod extending to
pletely into the tube 10 by a knob 44 mounted at the
the upper end of the tube. As the flow into the tube
top end thereof which is shaped to prevent its passage
increases, greater length of the calibrated rod is exposed
through bushing 40.
to the operator who reads directly the speed at which the
boat is traveling. IFlow into the tube is controlled by
the selection of a ?ow control bushing at the entrance to
By utilizing pressure control holes 42 in the tube, the
need for springs to regulate the movement of the piston
36 carrying the calibrated rod 38 is eliminated.
the tube having an ori?ce of a selected diameter related
to a plurality of vertically arranged apertures through
the tube in limiting the ?ow to that quantity required in
The calibrations on the rod 38 may be either stamped
or painted thereon such that only the Zero mark can be
seen when the boat is motionless. As the speed of the
producing a measurement of a speci?c range of speeds
encountered. Provisions are incorporated for holding
boat increases, an increasing number of marked grad
the speedometer in its operative position. When the
speedometer is released from this position, a compression
spring forces the tube upwardly to raise it above the
level of the bottom of the boat thus removing it from a
position when it may be damaged by dragging.
These and other objects will become apparent from the
following description and the accompanying drawings
uations are displayed.
If desired, other catch means well known in the art
may be incorporated with the invention to substitute for
the described arrangement for holding the speedometer
in its operative position. This would allow the device to
be mounted on other areas of the boat as well as facili
tating projection of the lower portion of the speedometer
to depths other than that of the boat bottom.
of a preferred embodiment of the invention wherein:
The applicant has disclosed a preferred embodiment
55
FIGURE 1 is a side elevation of the device mounted
of his invention for the purpose of illustration only to
on a boat in its operative position with the boat motion
enable one skilled in the art to practice this invention.
The illustrative embodiment is therefore not to be limit
less;
’
FIGURE 2 is a side elevation of the device in its oper
ing as the invention is limited only by the spirit and scope
ative position with the boat in motion;
60 of the appended claims wherein applicant is entitled to
FIGURE 3 is a side elevation with the speedometer
a reasonable range of equivalents.
shown partially in section;
I claim:
FIGURE 4 is a sectional elevation view of a segment
1. A speedometer for use with power boats comprising;
of the device showing flow pattern during operation; and
a generally L-shaped tube having upper and lower por
FIGURE 5 is a side elevation of the device mounted 65 tions, a calibrated rod within said upper portion of said
on a boat and in its retracted position.
tube, a piston mounted at the lower end of said rod for
Referring to the drawings, the improved boat speed
movement therewith within said upper portion, said upper
ometer consists of a tube 10 having an upper portion 12
portion provided with a plurality of vertically arranged
apertures for controlling the ?ow of water entering said
and a lower portion 14 bent at an angle of 90 degrees
to the upper portion. This generally L-shaped tube 10 70 lower portion and exiting from said upper portion, hold
ing means for maintaining said lower portion in a pro
is attached to the rear of the boat by brackets 16 and 18.
jected position at a level below that of the boat bottom,
Between the bracket 16 and a handle clamp 28, rigidly
3,095,738
4
and spring means for retracting said lower portion to a
position above the level of the boat bottom on release
of said holding means.
I
position at a level below that of the boat bottom, spring
means for retraction of said lower portion to a level
above that of the boat bottom on release of said holding
means, and handle means to position the end of said
2. A speedometer for use' in measuring relative motion
between water and a boat moving thereon comprising; 5 lower portion in the direction of travel.
a generally L-shaped tube having upper and lower por
References Cited in the ?le of this patent
tions, a calibrated rod within said upper portion of said
UNITED STATES PATENTS
tube, a piston mounted at the lower end of said rod for
movement therewith within said upper portion of said
1,238,498
Dawley _____________ __ Aug. 28, 1917
tube, a bushing mounted on the top of said upper por
1,869,962
1,869,974
1,883,582
1,885,933
2,576,687
2,733,601
Golden ______________ __ Aug. 2,
Masters ______________ __ Aug. 2,
Cole ________________ __ Oct. 18,
Masters _____________ __ Nov. 1,
tion through which said calibrated rod extends, a flow
control bushing mounted on the end of said lower‘ por
tion of said tube, said ?ow control bushing provided with
an ori?ce of such a size as to allow the desired flow of
?uid within said tube, the upper portion of said tube pro 15
vided with a pluarity of apertures vertically arranged to
allow the exit of fluid ?owing within said tube, holding
means for maintaining said lower portion in a projected
1932
1932
1932
1932
Krehbiel ____________ __ Nov. 27, 1951
Mitchell ______________ __ Feb. 7, 1956
FOREIGN PATENTS
44,910
Sweden _____________ ___ May 22, 1917
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