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Патент USA US2106068

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Jan. 1s, 1938.
Filed Jan. 2, 1936
' Patented Jaa. is, 193s
Charles W. Sirch, Los Angeles, Calif.
Application January z, 1936, serial No. 57,192
12 Claims. (Cl. 272-66)
This invention relates to spring boards and
particularly to those with adjustable fulcrums.
Recent sanitary regulations for controlling the
pionship contests and thereby preventing em
barrassment which is frequently occasion by
peculiar mob-psychology reactions during the
operation of swimming pools and spring boards
.-5 require that the board shall have a certain mini
mum angle of inclination to insure proper drain
lever is accepted as a more digniñed or normal
age from it. It is sometimes necessary for a diver
in a diving exhibition to adjust the fulcrum of
act than treadwheel operation with the bare,
often slippery, feet, especially during a wait
the diving board himself and in one adjustable
diving board that has come into limited use the
construction is such as to cause delay in making
the adjustment and to make the diver appear
more or less ludicrous on account of the fact that
he is obliged to balancehimself on one foot at
the side of the board (to relieve the'board of
his weight) while he must simultaneously rotate
an adjusting crank with his other foot to adjust
the fulcrum.
An object of my invention is to provide a div
20 ing board construction in which the fulcrum can
readily be adjusted while `the diver’s weight is
on the board; also to provide a construction in
which the requisite inclination of the board will
be maintained in any position of the fulcrum.
A further object is to provide a fulcrum which
will support the board and facilitate flexing of
the board Without providing spongy crevices for
accumulation of water. This is particularly nec
essary because extraordinary corrosion menaces
rv30 the operativeness and safety of apparatus upon
the parts of which chlorinous water, peculiar to
the modern sanitary swimming pool, drips from
bathing suits, feet etc. Free chlorine to the
amount of five-tenths part per million is manda
35 tory in swimming pool water under public health
regulations, an even stronger solution being com
pulsory for immersion of the feet of bathers.
Naturally, the mere appearance of the eiïects of
corrosion upon parts which are not of massive
40 construction militates against the conñdence
and poise which are most important elements of
the diver’s performance.
A further object is to provide a construction in
which both the lock and the actuating means
45 may be operated in an accustomed human man
ner by grasping a lever. This is desirable for
co-operation with the eiîorts now being made by
sanitarians to prevent the spread of Widely prev
alent foot-diseases. Of course infection preven
50 tive measures, such as immersion in the (sig
nificantly) strong chlorine solution mentioned,
are of limited beneñt if, nevertheless, a diver
may contract the disease in pawing a knurled
wheel or treadle. It is also desirable for ade
55 quate functioning of the diving board in cham
expectant hush with which the appearance of a
contender is greeted. Manual operation< of a
when this diversion, for some reason, seems un
usually provocative.
A further object is to provide a construction
which can be Aoperated Without requiring the
diver to turn around to face the tip of the board;
also to enable operation by a person when stand
ing on the ñoor, as the coach.
A further object is to provide a fulcrum, or
fulcrum-assembly, so constructed as to be
adapted to be moved or operated. without slid
ing, rubbing or scraping either the board or
fulcrum or supporting track or treadle and yet L
without requiring the removal of any weight from
any of these. This is important because, as the
average spring board Weighs about 300 pounds,
friction, Wear,_deformity and consequentinac
curacy result from sliding, as may occur when
the board is being flexed-a slight deformity
effecting an even greater deviation at the tip of
the board.
A further object is to provide a support for
a diving board which is free from the construc 30
tional, operating, repair or replacement diñî
culties which are inherent in the irregular or
multiple inclined plane structures.
Further objects will appear from the speci
C13 Cil
The invention resides in the combination of
the elements, arrangement of the parts and in
the details of construction, as hereinafter speci
fied and then claimed with'reference to the
accompanying drawing illustrating an embodi
ment of my invention, and in which
Fig. l is a side elevational view, partly broken
away and partly in section, of the portion of a
swimming pool which is adjacent to its surround
ing wall and illustrating the part of the prome
nade or iloor which supports apparatus em
bodying my invention.
Fig. 2 is an enlarged transverse side-eleva
tional view, partly in section, approximately r
along the lines B-B Fig. 3.
Fig. 3 is an elevational end view, partly in
section and partly broken away, locking from the
tip of the board, approximately along the lines
A-A Fig. l, showing details of my invention.
I shall now proceed to explain, in detail, the 55
structure and operation vof theinvention and
' the incidental parts thereof.
very limited variety and the expense of select
ing and conditioning the flawless hearts of le
lected growth makes them costly. The mechani
cal life oi' the best of these boards, when the!
In Fig. 1 the springboard is shown inclined at
the definite angle which was universally ordained
by the vested omcial regulatory bodies for the
standard slope of diving boards. Also ordained
are subjected to much use and to the abrupt g
shearing against a slender fulcrum is only a few
is a dimension, represented by II, known as the
omcial height, which is the required distance
between the tip of the board and the water.
crum, by prolonging the mechanical life of the
springboard, reduces- expense of replacements
Novel means for maintaining the oficial height
and slope when the fulcrum is shifted are pro
vided by elements in which the concentrated
stresses, produced by the violent flexion of the
board, are borne by massive, durable members,
15 instead of a multiplicity of slender, sliding parts,
the strength of which diminishes rapidly as the
repeated scraping exposes the _metal to- the cor
rosion. 'I'he moving parts, upon which the
diver's safety, aid and assurance depend, are
adapted for continuing, easy, smooth operative
ness, thereby promoting frequent shifting of the
fulcrum, consequently conserving the fibrous
structure of the board.
In the drawing the concrete slab 23, forming
the iloor around the pool, is used as a foundation
and anchor bolts 24, imbedded therein and pass
ing through lugs 25, amxed to the legs 5-I4,
provide a iixed base for the rectangular, rigid,
bench-like baseframe of which the legs 5-I4
30 are the vertical, and 6_22 the horizontal mem
bers. This base-frame is adapted to be made any
where of suitable construction materials, treated
or coated for resisting corrosion. The butt of
the springboard l may be drilled and clamped
35 to the horizontal member 22 together with the
adapters or spacers I3 by means of a clamping
bar 2|, adapted to receive bolts 2li extending
through the fixed end of the board, adapters I2
and the horizontal member 22.
Novel means of supporting the flexible end of
the board are provided. Thefhorizontal mem
bers l may be constructed of Z-section material
which is adapted to serve as a guide, track and
rack for the wheels l, which are preferably fixed
45 ly mounted, as by the key I1, on the fulcrum-shaft
I. The board 9 is supported by the fulcrum
drum Il, rotatably mounted upon the fulcrum
shaft I, by means of the bearings I6, retainers
2l and pins 3i, so that the fulcrum may be
rolled along the board by rolling the wheels I
along the parallel horizontal members 6. ~ In
making an adjustment the path of the 'fulcrum
shaft I is kept parallel with the specified slope
of the board by the eccentric shape of wheels 3,
curved for continuous motion >between maxi
mum and minimum radii. To prevent the wheels
l from skidding and for centering or aligning the
wheels I on the horizontal member 6, correlative
engaging means are provided on these members.
These may consist of pins 33 projecting from
the horizontal member 6 and adapted to ñt in
to correlativa openings 34 in the wheels 3. The
advantages which my fulcrum-drum affords in
the preservation and improved action of a
lspringboard by yielding to rotative motion and by
reducing the concentration of shearing stresses
are of general importance in the efficient func
tioning of a diving board. My fulcrum-drum,
whether divided as shown or in a single unit, is
70 adapted to present to the board the optimum
support, in other words, a relatively long arc of
contact, such as shall co-operate with the char
acteristics of the wood during its iiexion, together
with a rotatable, yet ñxed, reliable support. 'I'he
wood from which springboards are made is of a
months, according to service records. My ful
and the frequency of such possible casualties as
may occur from a heavy, sheared board, particu
larly when the board falls from a tower. -
Novel means are provided to prevent jam
ming, such as may occur at either terminus of
the range of an adjustable fulcrum; also to indi
cate the position which the fulcrum occupies
in this range: also to lock the fulcruming means
at this position. I _conñne horizontal move
ment of the fulcruming means within the range
required for fulcruming (which, in practice, is
short compared to the length of the board)
preferably by the rigid bumper-frame 2 iixedly
disposed along the horizontal member I; thereby
wheels 3 and the handle of lever 21 are stopped
at either terminus of the range. The vertical
surfaces within frame 2 stop lever 21, which con
tains latch-pin I I, from being pulled too far over.
Part of the bumperframe forms a‘quadrant,
notched for holding the pin II for springlatching
the fulcruming means. Lever 21, wherever it may
be stopped or positioned always points toward the
fulcruming line of the springboard.
Novel means are provided to wheel the ful
crum along the board while> the diver is standing
safely with his two feet on the board and with
out lifting the board from its operable position.
In other words, fulcruming is accomplished
thereby lwhile the fulcrum is supporting the
combined weights of the board and the diver and
the diver is saved from the peculiarly upsetting
requirement of having to use his one foot to de
stroy his equilibrium on the other in cranking.
The forked lever arm I2 is rigidly radially
mounted upon shaft 4. Shaft 4 is supported
by vertical members 5, which have openings 2l
therethrough, constituting bearing
Shaft 4 has pins 32 therethrough to position it
in vertical members 5. The tubular lever 27
is rigidly añlxed, by the bolt 26, to the bent end
of shaft 4, which, together with the tubular lever
is bored for the bolt.
The free> end of lever 21
is shaped to iit the voperator’s hand; its hollow
interior conducts the push-rod 1 for the latch
pin II, afilxed thereto, up through the handle
shaped end 8 so that it may be pressed by the
thumb of the operator to release the latch-pin
II. The lever 21 may be of any length sumcient
for convenient and easy operation. It has a
slot 30 for the latch-'pin II; also perforations for
the pin I9 which supports the compressed spring w
I8 to lock the latch pin in the notches in 2.
It will now be readily understood from the
above, that when it is desired to shift the ful
crum point of the board it is only necessary for
the operator or diver to grasp the lever and shift
it to the desired point.
In practicing the invention I make the diame
ter of the fulcrum drum as large as the me
chanical characteristics of the board permit. I
make the least radius of the eccentric wheel l of 7g
the dimension required to give the board the
ofiicial height and slope when supported upon
the fulcrum at the point, within its range, nearest
the tip; and I make the greatest radius of the '
wheel 3 of the dimension required to give the 15
board the oiiicial height and slope when sup
ported upon the fulcrum at the point within its
range nearest the butt. And, as already stated,
I shape the curve of the eccentric between these
radii for continuous motion. '
It will be understood from the above that when
the fulcrum is moved along the horizontal mem
ber G the board 9 will be supported at the same
elevation and inclination regardless of the po
6. In a diving board apparatus, the combina»
tion oi' a spring board held iixed at one end, sup
porting means having a substantially horizontal
surface extending. lengthwise and below the
board, anda fulcrum member, said fulcrum mem
ber supporting the board and having turnable -
eccentric supports resting upon said horizontal
7. In a spring board apparatus for diving, a
10 sition oi.’ _the fulcrum within its range. Also that
base frame having substantially horizontal mem 10
the board is always in operable position. The ß bers extending lengthwise of said board, means
hand-operated lever is particularly adapted for for securing said board at one end to said frame,
the purpose, both because of the short range
within which springboards need fulcruming in
practice and for the sanitary requirements men
tioned. Definite, easy, quiet fulcruming when
the lever is shifted is an assured result of roll
ing the fulcrum; also better resilience of the
board and aid to the diver.
An important advantage oi' the invention is
that it is adapted for convenient and safe ship
ment to, and quick installation in, the remote'
or widely scattered regions where diving boards
are used, for example countries where the
25 Olympic events are held.
- It will now be apparent that I have devised
a novel and useful construction, which embodies
the features of advantage enumerated asl desir
able in the statement o! the invention and the
30 above description, and while I have, in the pres
ent instance, shown and described a preferred
embodiment thereof which will give in practice
satisfactory and reliable results, it is to be un
derstood that the same is susceptible of modi
iication in the various particulars without de
parting from the spirit or~scope of the inven
tion, or sacriiicing any of its advantages.
I claim:
l. In a diving board apparatus, the combina
40 tion oi’ a base-frame structure having horizontal
lengthway surfaces; a springboard, means for
securing one end of said board to said»Y frame, a
combined eccentric and fulcrum assembly mov
ably supported by said horizontal surfaces and
movable along under said board to support the
. same, and means for moving said fulcrum as
sembly _along said horizontal surface and said
board while supporting the weight of the board
and diver.
2. In a diving-board apparatus assembly, a
cylindrical fulcrum for supporting the board and
f having a co-axial eccentric member.
3. In a diving board assembly, an eccentric
fulcrum to support said board.
a combined cylindrical and eccentric fulcrum
member mounted upon said horizontal member
and adapted to support said board near its mid
dle, and means for moving said fulcrum member .
along said horizontal members and said board.
' 8. In a. spring board apparatus, in combination,
a spring board adapted to be rigidly .secured at
one end, a. base, and a movable fulcrum between 20
the base and the board comprising a combined
eccentric and cylindrical member.
9. In a spring board apparatus, in combination,
a spring board adapted to be rigidly secured at
one end, a base having a substantially hori 25
zontal top surface positioned ybeneath the mld
dle part oi’ the under surface of the board and
an interposed combined eccentric and cylindrical
fulcrum adapted to be moved along the base,
the eccentric portions engaging one surface and 30
the cylindrical portion the other surface, and
means i'or moving the eccentric while standing
upon the board.
10. In a spring board apparatus, in combina
tion, a spring board adapted to be rigidly secured 35
at one end, a base having a substantially horl
zontal top positioned beneath the middle part
of the board and an interposed combined eccen
tric andv cylindrical fulcrum adapted to be moved
along the base, the eccentric portions engaging 40
the base and the cylindrical portion the under
side of the board.
11. In a spring board apparatus, in combina
tion, a spring board having one end securely an
chored, a base frame having a substantially hor
izontal top positioned beneath the middle por
tion of the board, and a movable fulcrum inter
posed between the top of the base and theunder
side of the board, said fulcrum com' rising a cy
lindrical portion engaging the boar , and eccen
tric portions engaging the top of the base, and
means for rotating said fulcrum to move it along
the upper surface of the base.
12. In a diving board apparatus, the combina- e
4. In 'a diving board apparatus, eccentric tion of a base frame structure having substan 55
means to maintain a substantially ilxed position tially horizontal track surfaces,.a spring-board
oi' the board in any position of the fulcrum.
' above and approximately parallel to said sur
5. In a. diving board apparatus, a frame struc
' ture, means for securing one end oi' said board
60 to said trame. a horizontal track, a fulcrum mem
faces, means for securing one end of said board
to said frame, a combined eccentric and cylin
drical fulcrum assembly movably supported by
ber mounted on said track and adapted to sup
said horizontal track surfaces in anti-skid re
_ port said board at a constant angle from the hor- , lation and movable along said board, and means
,izontal and at predetermined intermediate points, adapted to move said-fulcrum assembly along
and means _for moving said fulcrum member said horizontal surface and said board while sup
along said track while said board, including the
porting the weight of the board and diver.
`weight oi?. the diver. is resting upon said
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