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Патент USA US3072411

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Jan. 8, 1963
R. C. RUDE
3,072,401
MOVABLE FULCRUM FOR SPRINGBOARDS
Filed Aug. 10, 1961
2 Sheets-Sheet 1
INVENTOR.
mi?
Jan. 8, 1963
R. c. RUDE
3,072,401
MOVABLE! FULCRUM FOR SPRINGBOARDS
Filed Aug. 10, 1961
2 Sheets-Sheet 2
ice
Unite
Ii?ilfi?l
Patented Jan. 8, 1963
2
1
3,072,401
Raymond Curtis Rude, 2510 Queensherry Road,
Referring to FIGURE 1, a diving tower 10 comprising
MOVABLE FULCRUM FUR SPRINGBOARDS
a ladder column 11 and a frame portion 12 is installed
on a deck 13 adjacent the edge of a swimming pool 14.
Pasadena, Calif.
Filed Aug. 10, 1961, Ser. No. 130,665
A pair of diverging arms 15 extend upwardly from the
frame members 12 to support guard rails 16. A movable
fulcrum 20 is located at the upper end of the frame 12 and
supports a diving board 17 which extends from the upper
end of the step column 11 over the top of the fulcrum 20.
This invention relates to supports for springboards.
The diving board has an end 18 ?xed to the step portion
More particularly it provides a movable fulcrum for loca
tion between the ?xed and the unsupported ends of a div 10 11 to be restrained from lateral and longitudinal move
ment; however, the connection at end 18 may accommo
ing or springboard.
v12 Claims. (Cl. 272-66)
In the use of springboards for diving, either for‘ pleasure
diving or precision competition diving, it is normal for
more than one diver to use the board.
Since it is rare
date rotational motion of that portion of the springboard
17.
As mentioned previously, the preferred form of the
that each of the divers using the board will have the same
springboard 17 is as disclosed in US. Patent No.
weight and diving style, i.e., stride during the take-off
2,864,616, but any conventional diving spring board is
compatible with this invention. The springboard 17 may
be made wholly of wood, from laminated metal portions,
from the board, the physical characteristics of the board
are not normally optimum for each diver. This is the
or from combinations of wood and metal materials.
case with diving boards utilizing a ?xed fulcrum.
As illustrated in‘FIGURE 2, the movable support ap
It is particularly desirable that a diver match the tim 20
paratus 20 is mounted upon the upper extents of the
ing of his stride with the resonant frequency of the board
frame members 12 of the board supporting and bracing
in order that the timing of the input of his weight to the
tower 10. A horizontal rail or load-bearing surface 21
board match the vibrational motions of the board. Since
is provided at the upper end of each of the tower legs 12
the natural or resonant frequency of the board is deter
‘mined by its cantilevered geometry and inherent stiffness, 25 (see FIGURE 2). The surfaces v21 preferably are co
planar and extend longitudinally of the board 17 between
the only satisfactory way in which a board can be matched
the arms 15 carrying the guard rails 16. The rail surfaces
to a diver’s style is to alter the geometry of its mounting.
21 extend from the outer surface of the tower legs 12 to
This is far more convenient than to have the diver change
parallel, oppositely disposed vertical surfaces 22 inboard
his style.
1
Provisions have been made in known devices to adjust 30 of the frame 12.
When the movable fulcrum apparatus 20 is utilized
the support geometry of the diving board. But these de
with a low diving tower, say a one-meter tower, the rail
vices are adjustable only in discrete stages and require
mounting arms 15 are not present to limit the motion
the adjustment to be made from the ground when the
of the movable fulcrum 20. in such cases a rail insert
board is unloaded. The device of this invention, on the
other hand, is adjustable continuously over a wide range. 35 24 (See FIGURE 4) is secured to the rail surface 21 by
screws 25 tapped into the tower legs 12. The rail insert
Moreover, the adjustment may be made by the diver while
plates 24 have upward ?anged ends 26 to limit the amount
he is on the board.
of travel of the movable support 211. The flanges 26 are
Generally speaking, this invention provides a movable
required since otherwise the wheels 35 of the chassis 311
support for an article secured, at a point remote from the
may run 011 the pedestal 12 forming a portion of the
location of the movable support, in a longitudinally ?xed
springboard mount;
condition. The support is practiced in conjunction with
A major portion of the movable fulcrum 26 is com
a substantially horizontal load-bearing surface accommo
prised of a chassis or frame 30. The chassis 30 has paral
dating movement of the support. The support includes a
lel side walls 31 extending transversely of the rails 21.
rotatable means engaging the underside of the article to
Enlarged end walls 32 join the walls 31. The top and
support the article. A carriage is provided for rotatably
bottom portions of the chassis 211 are open. A transverse
mounting the rotatable means; the carriage also includes
diaphragm or partition 33 extends between each side Wall
bearing means engaging the support surface to facilitate
31 adjacent the ends 32 (see FIGURE 4). The parti
movement of the carriage relative to the supported article.
tions 33 are depressed centrally of the side walls 31 to ac
High friction inducing means ?xed either to the article or
to the rotatable means are provided. The invention fur—. 50 commodate the rotatable fulcrum roller 50.
A pair of carriage wheels 35 are mounted to the chassis
ther includes means for rotating the rotatable means to
3d and engage the rails 21 or 24. Each wheel 35 prefer
react against the friction inducing means to move the sup
ably comprises ’a circularly cylindrical roller portion 36
port relative to the article.
and ‘an enlarged diameter or ?anged end portion 37. A
The following detailed description and explanation of a
preferred embodiment of the invention is made in con 55 hole 38 is drilled axially of the wheel 35 and journals an
axle 39 which is mounted between the respective ends 32
junction with the accompanying ?gures, wherein:
and partitions 33 of the chassis 311. The ?anges 37 are
FIGURE 1 is a side elevation of a diving tower incor
porating the movable support;
positioned adjacent the outboard surface of‘the partition
33 such that when the carriage 30 is positioned onthe
movable fulcrum as taken along line 11-11 of FIGURE 1; 60 rails 21 or 24, the ?anges 37 are adjacent the vertical
guide surfaces 22. The cooperation between the ?anges
FIGURE 3 is a further enlarged cross-sectional view
of the fulcrum roller and chassis rollers as taken along
37 and the surfaces 22 assures that the‘ support of the
springboard 17 is transversely of the springboard. The
line Til-Til of FIGURE 2; and
FIGURE 4 is an enlarged cross-sectional view of the
flanges 37 further assure that the carriage 31) does not
springboard and movable support as taken along line 65 become cocked or jammed relative to the rails 21.
IV—-—IV of FIGURE 2, including a displacement limiting
As best illustrated in FIGURE 4, the wheels 35 are
track insert on the springboard support.
spaced as far apart from one another as possible conso
The movable fulcrum provided by this invention is illus
nant with minimum chassis dimensions. The side walls
trated in conjunction with an all-metal extruded spring
31 of the body 30 are con?gured, as at 411, to accommo
board illustrated more completely in my United States 70 date the ?ange 37 and‘the main weight-bearing portion
Patent No. 2,864,616 issued December 16, 1958.
36 of the Wheels.
FIGURE 2 is an enlarged cross-sectional view of the
3,072,401
A rotatable fulcrum or springboard support roller 50 is
mounted between the ends 32 of the chassis 30. The
roller 59, in order to preserve lightness, is preferably com
prised of a tubular portion 51 comprising the body of the
roller. Disks or plugs 52 are ?xed within each of the
end portions 53 of the tubes 51. A circular hole 54 is
and a larger input would be required to move the carriage.
The feature of driving the carriage against the load-sup
porting article is adaptable to any installation where a
load-bearing support must be moved relative to the load
without removal of the load from the support. This in
vention utilizes the load itself to assure that the support
will move as desired.
drilled axially of the end disks 52. An axle 55 is securely
The environment selected for explanation and descrip
?tted in each hole 54 and extends outwardly from the
tion of the apparatus of this invention has been merely
roller ends 53 to be journalled by a bushing 56 force
?tted into the side walls 32 of the chassis. One of the It) by way of example and should not be considered as limit
ing the scope of this invention.
axles 56 is at least flush with the exterior surface of one
I claim:
of the chassis end walls 32, but the other end of axle 55
1. A movable support for a load-bearing article com
extends beyond the other chassis end wall 32 (refer to the
prising rotatable means engaging the underside of the
left side of FIGURE 2).
article for supporting the article, body means mounting
A roller rotating means 60, in the form of a wheel, is
attached to the free end of the projecting axle 5S. Pref
the rotatable means transversely of the article, a longi
erably the wheel 60 has projecting lugs 61 spaced around
its circumference to facilitate rotation of the wheel 6% and
roller 50 (see FIGURE 3). In a preferred embodiment
of the movable fulcrum, the outer periphery of the roller
50 is roughened by sand-blasting or by impregnation with
aggregate material 62.
The springboard 17 is provided with friction-inducing
tudinally oriented bearing surface for accommodating
movement of the body means, bearing surface engaging
means rotatably mounted to the body means for support
of the body means, and means connected to the rotatable
means for rotation therewith for rotating the rotatable
means against the article to displace the rotatable means
and its body means longitudinally of the article to change
the location of article support by the rotatable means.
ing traction between the springboard 17 and the roller 50‘. 25
2. A movable support according to claim 1 including
means between the rotatable means and the underside of
As stated above, this invention is most preferably prac
ticed with a springboard 17 fabricated according to the
the article for providing higher friction therebetween than
between the body ‘means and the bearing surface.
disclosures of U.S. Patent No. 2,864,616. In such a case
3. Adjustable position apparatus for support of an
the traction means 70 may take the form of rubber shoes,
extruded in the form of channels, engaged over the free 30 elongated load-bearing member having an underside, an
end restrained from longitudinal motion, and an opposite
ends of the depending bulbed ribs 71 on the underside
unsupported end, the apparatus comprising a planar sup
of the springboard 17. However, if the springboard 17
port surface, a rotatable roller engaged with the under
does not follow the construction as disclosed in Patent
side of the load bearing member at an intermediate portion
No. 2,864,616, the traction means 70 may be glued or
bonded to the underside of the springboard. Alternative
of the member, the roller being disposed transversely of
the member, movable means for rotatably mounting the
ly, the drum or roller 50 may have a rubber tire bonded
roller, means for rollably supporting the movable means
thereto over its length between the ends 32 of the carriage
on the support surface, means for guiding the movable
30. The rubber shoes 70, illustrated in FIGURE 3, pro
vide a high coef?eient of friction between the roller 50 40 means longitudinally of the member during movement
along the support surface, and means for rotating the
and the under surface of the springboard 17 so that the
roller to displace the movable means along the support
reaction between elements 17 and 59, produced by rotation
surface by reaction between the roller and the member to
of the roller 50, results in movement of the carriage 36
adjust the position of roller support of the member.
along the rail 21.
.
4. Adjustable position apparatus for support of an
During operation of the movable fulcrum as disclosed
elongated load-bearing member having an underside, an
herein, particular advantage is derived from the roller
end restrained from longitudinal motion, and an opposite
drive wheel 60. A diver standing on the tower 1f) oper—
unsupported end, the apparatus comprising a planar sup
ates the movable fulcrum 20 by turning the whee] 64} in
port surface, a roller having opposite ends journalled ad
the desired direction by foot. The wheel 60, being of
larger diameter than the roller 50, provides a high me 50 jacent its ends and engaged with the underside of an inter
mediate portion of the member transversely of the mem
chanical advantage so that little effort is required to prop
ber, journal means rotatably mounting the roller adjacent
erly position the fulcrum 59. It is thus a simple matter
its ends, means for reliably supporting the journal means
for a diver, upon discovering that the roller St} is not lo
on the support surface, means between the roller and the
cated in a position providing a springboard natural fre
underside of the load-bearing member for providing a
quency compatible with his diving style, to adjust the
higher coe?’icient of friction therebetween than between
springing characteristics of the board 17 without descend
the journal means and the support surface, and means for
ing from the tower 10.
rotating the roller to displace the journal means along
As is readily apparent from FIGURE 1, the projection
the support surface by reaction between the roller and the
of the wheel 60 outwardly from the side of the tower leg
12 results in interference with the rail arms 15. This fact 60 member to adjust the position of roller support of the
member.
automatically limits the extent of travel of the fulcrum
5. Adjustable position apparatus for support of an
means 26. But the movable fulcrum means 29 provided
elongated load-bearing member having an undersurface,
by this invention is also adaptable to a low diving board
an end restrained from longitudinal motion and an op
where guard rails are not normally provided. In this
posite unsupported end, the apparatus comprising a planar
type of installation, the rail insert plate 24 with the up
support surface, a rotatable roller having opposite ends and
wardly ?anged ends 26 is provided as a safety feature
a roughened peripheral surface engaged with the under
to prevent the fulcrum SE) from rolling off the fulcrum
side of an intermediate portion of the member transversely
pedestal.
of the member, traction assuring means aiiixed to the
Another feature of this invention is that the roller 54)
under surface of the member along the intermediate por
is driven against the load-bearing member 17 rather than
tion, shaft means secured to the roller and extending
against a stationary base. This feature provides for ac
axially from the ends of the roller, means for journaliing
curate location of the carriage 30 without undue effort
since the load is used to provide traction. If the carriage
the shaft means of the roilcr, means for reliably support
30 were driven against the ground or support surface 21,
ing the journal
on the support surface, means for
then the carriage would have to work against the load
guiding the journal means longitudinally of the member
means 70 in the vicinity of the movable support 20 assur
3,072,401
5
during movement along the support surface, and means
for rotating the roller to displace the journal means along
the support surface by reaction between the roller and
the member to adjust the position of roller support of the
member, wherein the traction assuring means and the
roughened surface of the roller assure that the roller is
driven against the underside of the member.
6. An adjustable point-of-support apparatus for a sub
stantially cantilevered member engageable against the
6
9. An adjustable point-of-support apparatus for a canti
levered member engageable against the underside of the
member between the end constrained from longitudinal
movement and the unsupported end, the apparatus com
prising a chassis, a roller rotatably mounted in the chassis
transversely of the member and having its upper periphery
engaged with the underside of the member, a planar sup
port surface for the chassis, wheel means mounted to the
chassis and engaging the surface so that the chassis is
underside of the member between the constrained end and 10 movable relative to the support surface, and means for
the unsupported end, the apparatus comprising a chassis,
rotating the roller, whereby rotation of the roller and
engagement thereof with the member results in movement
of the roller relative to the member to adjust the location
of support of the member by the roller.
10. A movable fulcrum for a springboard having a
for the chassis, wheel means mounted to the chassis and 15
substantially ?xed end and an unsupported end in com
engaging the support surface for movement of the chassis
bination with a support for the springboard intermediate
relative to the support surface, means for guiding the
the ends thereof, the support providing a pair of horizontal
chassis longitudinally of the member during motion rela
spaced-apart parallel rails extending longitudinally of the
tive to the support surface, means for rotating the roller,
and means for providing a higher coeilicient of friction 20 springboard, the fulcrum comprising a frame supported on
and between the rails, a pair of rollers mounted by the
between the roller and the member than between the chas
frame at each of a pair of opposite ends of the frame en
sis and the support surface, whereby rotation of the“
gagement with the rails, each roller being ?anged peripher
roller and engagement thereof with the member results in
ally at one of its ends, the roller ?anges engaging the op
movement of the roller relative to the member to adjust
25 posed sides of the rails for directing frame movement lon
the location of support of the member by the roller.
gitudinally of the springboard, a springboard fulcrum roll
7. An adjustable point-of-support apparatus for a can
er rotatably mounted to the frame and oriented transversely
tilevered member engageable against the underside of the
of the springboard and engaging the under surface thereof,
member between the ?xed end and the unsupported end,
means secured to the underside of the springboard in the
the apparatus comprising a chassis, a roller, a shaft to
which the roller is coaxially secured and having ends ex 30 vicinity of the support for providing high friction between
the springboard and the fulcrum, and means accessible
tended beyond the roller and journalled in the chassis
to a person on the springboard for rotating the fulcrum
so that the roller is disposed transversely of the member
roller, whereby the frame is driven along the rails and
and has its upper periphery engaged with the underside
the position of the fulcrum is adjustable longitudinally
of the member, a planar support surface for the chassis,
wheel means mounted to the chassis and engaging the 35 of the springboard by rotation of the fulcrum roller against
the friction providing means.
‘
surface for movement of the chassis relative to the sup
11.
A
movable
fulcrum
according
to
claim
10
wherein
port surface, means for limiting the’ movement of the
the springboard includes longitudinal parallel downward
chassis relative to the support surface, means for guiding
a roller rotatably mounted to the chassis transversely of
the member and having its upper periphery engaged with
the underside of the member, a planar support surface
the chassis longitudinally of the member during motion
projections, the means for providing high friction between
relative to the support surface, means for rotating the 40 the springboard and the fulcrum comprises shoe means
engaged with the projection means in the vicinity of the
roller, and means for providing a higher coe?icient of
support, and the circumference of the fulcrum roller is
friction between the roller and the member than between
roughened for positive engagement with the shoe means.
the chassis and the support surface, whereby rotation
12. A movable fulcrum according to claim 10 wherein
of the roller and engagement thereof with the member
the means for rotating the fulcrum roller comprises a
results in movement of the roller relative’ to the member 45 wheel having radial lugs and mounted coaxially of the ful
to adjust the location of the support of the member by the
crum roller and positioned outwardly of a longitudinal
roller.
side
of the springboard.
8. Apparatus according to claim 7 wherein the means
for limiting the amount of movement of the chassis
References Cited in the ?le of this patent
relative to the support surface comprises projection means 50
UNITED STATES PATENTS
extending upwardly from the support surface engageable
with the wheel means.
2,032,574
Handley _____________ __ Mar. 3, 1936
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