Games using tangible projectile – Playing field or court game; game element or accessory... – Practice or training device
Reexamination Certificate
2000-04-03
2001-10-09
Chiu, Raleigh W. (Department: 3711)
Games using tangible projectile
Playing field or court game; game element or accessory...
Practice or training device
C473S421000, C473S454000, C473S462000, C473S476000
Reexamination Certificate
active
06299554
ABSTRACT:
FIELD OF THE INVENTION
This invention concerns throwing and catching nets for ball games in particular but not limited to a rebound throwing and catching net for the practice of ball catching, throwing and batting skills.
BACKGROUND ART
Players of ball games such as cricket, baseball, basketball, netball and variants of these games must practise both throwing and catching the ball at playing speeds to maintain their judgement and co-ordination.
In the above bat and/or ball games, catchers who stand near the batsman or striker have the motor skills to catch but must develop anticipation in order to react sufficiently quickly. A conventional catching net causes a ball thrown at the net, to rebound with most of the throwers energy. The ball is caught by the thrower or someone close by. As the catcher relies upon the angle of incidence/angle of reflection law to anticipate the rebound angle, reaction speed to balls which are struck and return at odd angles during an actual game is not improved.
This invention addresses this problem.
OBJECT OF THE INVENTION
It is an objective that this invention provides a throwing and catching net which causes a ball to rebound in an unpredictable manner or to at least provide the public with a usefull choice.
SUMMARY OF THE INVENTION
In one aspect, the invention resides in a throwing and catching net including in combination a frame member adapted to support a net, the net comprising one or more layers of lattice adapted to cause an object, typically a ball, thrown at the net to rebound in an unpredictable manner, wherein in use, catching, throwing and/or batting skills of a user can be practised.
The net may be tensioned by a frame or other conventional means for imparting rebound energy to the ball. The frame may have mounting means for erecting the frame on the ground or other support surface. The mounting means may be one or more struts which maintain the frame at a reflex angle to the ground. The frame may have ground engaging parts for locating one edge of the frame on grass.
Preferably the frame is galvanised tube or pipe of 25 mm diameter.
Preferably the sides of the frame are slightly curved away from or towards the net for increased strength and to resist the inwards pulling force of the net.
Preferably the curve of the frame's sides is about 20 mm per metre of length of pipe.
The net may comprise a pair of superimposed lattices. The lattices must be sufficiently close to both impart rebound energy to a ball when the ball is thrown at the net. Preferably one lattice is in contact with the other. The lattices may have rectangular or square cells. If the lattices are too large in relation to the ball diameter the ball passes through the lattices and no rebound occurs. The best result seems to occur when the lattice approaches the size which allows the ball to pass through but which prevents such passage.
The strands of the x-axis in one lattice may be coincident, that is one behind the other, whereas the strands lying on the y-axis of the first lattice are spaced from the strands on the y-axis of the second lattice. The spacing may be greater in the central area of the net than at the border area of the net. Staggering the lattices is an optional feature. Good results are obtained when the lattices are accurately superimposed. The effect of the knots in the lattice seems to be influential. In another version the strands contain knots which are not part of the lattice ie. they are present in order to impart grip to the lattice. Instead beads or like projections may be located in the lattices. In still another version a single lattice is used where the lattice cells have knobbly projections in the throwing direction so as to make contact with the ball as it rebounds.
The central zone may have lattices which are 90 degrees out of phase so that the cells in one axis appear to be only half the height of the cells at the edge of the net. The lattices remain superimposed in the x-axis and this provides the rebounding force whereas the variation in the spacing between the lattices maximises at the centre zone and minimises at the two opposite edges produces the unpredictable directional rebound. Each impact produces a different polygon of forces.
The unpredictable rebound has been best observed when two layers of the same lattice are superimposed.
In yet another version, a third lattice is added to the two superimposed lattices. This ensures that balls of a smaller diameter than cricket balls or baseballs do not pass through the net, This version also provides one side of the net with a more predictable or regular rebound surface for use by novices or users who prefer a more predictable return of the ball, for example, when underarming the ball into the net and then batting it on its return.
The net may be polygonal, oval or circular but these shapes are more difficult to manufacture and offer no advantage over rectangular nets.
The nets may be stretched between opposed pairs of tensioners and the tensioners are in turn suspended tautly within the frame by resilient means. The means may include tension springs but we prefer elastic cord.
The tensioners may modify the stretching force applied to the net. The tensioner may be a tube of resilient material. The tube may be threaded through alternate strands of the net while the cord is spirally wound between the lattices. The tube may be made of a polyethylene ALKATHENE® or galvanised tube.
In another aspect, the invention resides in a method of practising throwing, catching and/or batting skills including the steps of:
1) throwing a ball against a throwing and catching net adapted to cause the ball to rebound in an unpredictable manner,
2) catching or batting the ball accordingly, and
3) repeating steps (1) and (2).
One embodiment of the invention is now described with reference to the accompanying drawings in which:
FIG.
1
: is a comer fragment of the frame tensioner and net.
FIG.
2
: is an end section through the fragment of FIG.
1
.
FIG.
3
: is a front view of the tensioned lattices.
FIG.
4
: is a perspective drawing of the invention in use.
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Sinclair Andrew McKay
Sinclair Louise Mary
Chiu Raleigh W.
Welsh & Katz Ltd.
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