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Патент USA US2110084

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1, 1938,
Original Filed Aug. 7, 1954
Rum/f Hs/ms?s,
Patented Mar. 1, 1938
Rudolf Heimers, Mexico, D. F., Mexico
Original application August 7, 1934, Serial No.
738,876. Divided and this application June 1,
1937, Seri al No. 145,902. In Mexico August 11,
5 Claims. (Cl. 273-97)
The invention relates to ball games, and more
Figure 7 shows the bracket with wheels at
especially to games in which the ball is attached
tached to the top of the racket.
to an elastic string and after being thrown re
Figure 8 is a sectional View of the hollow cover
turns automatically towards the throwing or
5 striking surface.
with wheels entering the lower extremity of the
The new feature of the in
racket handle.
vention consists in passing the elastic string
Figure 9 shows an outer attachment for the
through friction-reducing means provided in the
the elastic is
striking or throwing surface, and in using a handle with wheels around which
longer elastic, so as to enable the player to throw Wound.
Figure 10 is a back view of another tennis
the ball at a much greater distance with the
racket with a detachable frame holding the 10
same ease than with a shorter elastic.
' The invention has, for its object to provide
means whereby the length of the elastic may be
adapted to the skill of the player, so that the
ball may either remain separated for a greater
or lesser distancefrom the striking or throwing
surface after it has returned through the con
traction of the elastic, or may be forced to return
completely into contact with said surface, which
20 ever may be the length of the elastic or the force
with which the ball was thrown, but always per
mitting the ball to be thrown at a much greater
distance due to the greater length of the elastic
The features of the invention comprising fric
tion-reducing means, located in the striking or
throwing surface for enabling the elastic string
to pass without excessive friction, and means for
attaching a long elastic to the body of the player
30 or housing it in the
throwing implement itself,
it will be readily understood that these features
may be applied to a
throwing devices,
variety of diiferently shaped
such as bats, rackets and
others, providing a great diversity of games based
35 on the same principle.
This application is a division of application
Serial No. 738,876, ?led August 7, 1934.
In the accompanying drawing, in which several
preferred embodiments of the invention are
40 shown :
Figure 1 is a front View of an oval throwing
board with the elastic rolled up on a wheel with
twisted axle.
Figure 2 is a transversal vertical cross-section
of the device shown in Figure 1.
Figure 3 is a detailed view of the wheel with
twisted axle.
Figure 4 shows a tennis racket provided with
50 a friction-reducing attachment and with the
’ elastic housed in the handle.
Figure 5 is a side view of the racket, with the
handle shown in cross-section.
Figure 6 is a detailed view of the detachable
friction-reducing attachment,
wheels and the friction-reducing device.
Figure 11 is a detailed view of this frame.
The following devices to be described all make
use of an improved friction-reducing device com
prising two pairs of rollers 1, with one pair placed 15
at right angle to the other, said rollers turning
on conical points entering the sides of a separate
casing. As the elastic 5 passes through the cen
tral opening of said pairs of rollers, the friction
is greatly reduced by the revolving rollers.
In the device shown in Figures 1 and 2, an oval
board 8 is attached to a hollow handle 9. The
friction-reducing rollers 7 are located within the
center of the board 8 and the elastic 5, attached
to the ball 4, passes back of the board 8 into 25
the handle 9 and is wound around a spool I0
provided in the lower part of said handle. The
spool 10 has two elastic strings ll passing through
it (Figure 3) which are already twisted to keep
the elastic stretched and which twist themselves 30.
more tightly as the elastic is unwound from the
spool, rotating therefore in an opposite direction
the spool on which the elastic winds itself as the
ball returns after having been thrown by the
board 8.
Figures 4, 5 and 10 show the friction-reducing
rollers '! attached to a tennis racket l2. The roll
ers l are housed in a casing l3 (Figure 6) pro
vided on opposite sides with U-shaped channels
l4 into which enter two of the central strings 40
of the racket. The elastic 5 passes between said
rollers 1 to the back of the racket, and from
there is led upward and downward in several
turns around two sets of wheels or rollers l5, the
upper set of which is ?xed to a bracket I 6 at- 45
tached to the upper part of the racket, and the
lower set is placed on a transversal axle in a
hollow cover I‘! which closes the open lower ex
tremity of the hollow racket handle. A wire I8
having an upper eye is also secured with its lower 50
extremity inside of said cover I‘! and serves to
pull the end of the elastic through the handle
when a new string is being inserted. The ball 4
may be held against the handle of the racket
by a spring I9 when the racket is to be used for 55
tachably secured to the strings of said racket,
said elastic passing through said friction-reduc
playing with a free ball, but may be instantly re
leased when it is desired to use the ball attached
to the elastic.
ing means, and means attached to said racket and
comprising a plurality of rollers for winding upon
them a plurality of turns of the elastic.
3. A ball game, comprising a racket having a
hollow handle, friction-reducing means secured
Figure 9 shows a spring clip bracket 20 carry
ing the lower set of, rollers I5, which may be
slipped on the handle of a racket instead of
using the hollow handle shown in Figure 5. The
to thestrings oithe raclsctlanelastic passing
through Said firictiomteducing meansiarban at
two attachments ,1 and,“ maytherefpmbe used
on any tennis ,raoket :ior pragtice purposeshand
tached‘to said’ elastic, a set of rollers ‘provided on 10
the upper part of said racket on the side opposite
of rollers l5 may be held by a thumbnut or other to ‘the ball, a second set of rollers mounted with
detachable means, the relatively great length-v jingthe hollow handle, the elastic being led around
of the elastic stretched between the rollers :15. said upper and lower rollers, means for pulling
being sufficient for permitting the. ball ‘to be the elastic‘through said hollow handle, and means 15
15 thrown a great distance and at different angles; v_-f‘orv_detaining the ball out of contact with the
10 the only ‘other attachment l6 for the upper set
In Figure 10, the upper rollers .45 are: nlaced
on the upper part of a wire iirame 2.1‘ towhich
are also slidably attached ‘the casing .113 (for the,
friction-reducing rollers 1 and a bracket 22__sim-,
20 ilar to bracket 20 and supporting the'lower set '
of rollers 15. This ,fA-rame is held inzplace by‘the
bracket 22 and the “casing l3, and ~may also-be
attached to any tennis racketand taken-9ft" at
What I claim is:-
.1.- A. ball eama-comprisirigaulelastic attached
at Qneend to aball, a racketairicticn reducing
guide comprising pairs of crossed rollers, de
tachably secured vtcnsiiiii racket. and means :at
39 tached .to the vracket and ,comprising a plurality
of rollers for Wilding (upon them a plurality of
turns, of theelastie.
2- A;ba1l game, comprising a baltfan elastic
attached to said balta racket, rfriction reducing
means vcomprising"crossed- pairs of rollers dc.-v
striking surface ‘of ,the racket.
.4. A ball game, comprising a racket, a frame
crossed 'pairs of rollers, an upper and a lower
setvof rollers vattached to said frame, a bracket
holding said frame to the handle of said racket,
means ,for holding the friction-reducing means
between thestrings of ‘the racket, a-ball, and an
elastic attached to‘ said ball, said elastic passing 2.5
through said ,frictionereducing means and. being
wound alternatively .aroundrsaid upper and lower
5. vAball‘game,,cQmnrising an elastic attached
at one endto a ball, a racket, a friction reducing
guide detachably secured to said racket, and
means attached to the racket and comprising a
pluralityiof rollers for winding uponvthem a plu
rality of turnslof theelastic.
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