BACKGROUND OF THE INVENTION Pedal bicycles, exercise bicycles, certain fitness equipment, and the like, generally (hereinafter referred to as"pedalling apparatus") have a seat for a user to sit on whi le pedalling. In an attempt to al low people of different physique to use the same pedalling apparatus, it is provided with an adjustably positionable seat arrangement. This seat arrangement has the seat clamped to one end of a seat post, and the opposite end of the seat post is adjustably positioned into a straight seat tube with little or no horizontal adjustment. As such, the prior art pedalling apparatus provides seat post adjustments only for the differences in the riders'leg lengths. Adjustments for differences in arm lengths and torso lengths are made in the forward frame section and the handlebars. The prior art apparatus also does not provide for adjustments to suit differences in torso lengths and arm lengths in riders of the same height. Furthermore, the seat arrangement of the prior art apparatus is notcapable of providing adjustments to suitvarying rider physiques whilst retaining enough space for the legs to pedal efficiently with the rider remaining seated in a position that provides correct anatomical support. Consequently, the prior art apparatus does nor provide sufficient beneficial adjustability for people of all physiques.

Many users of the prior art pedalling apparatus therefore continue to suffer pain and discomfort due to pedalling while sitting on a seat that is at an incorrect pedalling position for them. The incorrect pedalling position causes pain and discomfort for the riders and places the riders to pedal in an inefficient pedalling action which requires strenuous effort in pedalling, and thereby causes quick body exhaustion.

Designers of pedalling apparatus resort to use different frame sizes in order to allow more people to ride in the correct pedalling position. Some manufacturers have up to seven different frame sizes for a particular model of their pedalling

apparatus. But, even with that many frame sizes, they are unable to provide all adjustments required to suit the variances in physique of all users. Moreover, making and stocking many different frame sizes are not cost efficient as more jigs and frame materials are required for manufacturing, and more storage space is required for wholesalers and retailers to stock pedalling apparatuses with many different frame sizes.

Most popular upright bicycles (mountain bikes, citybikes, hybrids) are therefore produced in a number of frame sizes. Examples of frame sizes of certain leading bicycle makers are: * Trek USA-FUEL 90 model: Men-S, M, L, XL Women-XS, SM 7200 FX model : Men-15", 17", 20", 22" Women-17", 20" * Raleigh USA-SC200 model : Men-16", 18', 20", 22" Women-16", 19" * Fuji-Regis model : Men-S, M, L Women-15", 18" * Schwinn-Mesa GS model : Men-15", 17", 19', 21', 23' Despite having a large number of frame sizes, customised adjustment in these bicycles is limited to the extent to which the seat post can be vertically adjusted in height and the minimal fore/aft adjustment of the seat using the universal"rails"system, plus the adjustment of the handle bar position. The adjustment does not provide fine, increment adjustment of the vertical and horizontal positioning of the seat to cater for varying torso, arm and leg lengths within the same height of riders and fails to provide easy, simultaneous adjustment in both planes.

The inventor has noted that the designs of the prior art pedalling apparatus as a whole do not provide correct anatomical support for the desired pedalling position. Examples of these designs are the"mountain bike"design, the hybrids/citybike design, and designs of certain exercise equipment.

Mountain Bike The popular"mountain bike"design of bicycles uses an upright seat tube as the rear section of the frame and has a low-set handle bar at the front section. This design results in a"bent-spine"riding position with mostof the rider's weightpulled forward onto the front part (horn or pommel) of the seat. The rider's weight is then

supported by the perineum and central crotch area, whereby causing the rider to suffer considerable discomfort. This incorrect support of the rider also creates abrasion and chafing of the inner thighs, central crotch and the genitalia of the rider, causing pain and further discomfort. The correct support for the rider's weight is by the ischial tuberosities (sit bones).

The low-set handle bar of the mountain bike design causes the rider to bend his upper body forward in order to grasp the handle bar by the hands. Such bending causes cramping of the diaphragm and it places a lot of pressure on the hands and arms.

The bent-spine position also causes cramps to the body and an ineffective pedalling action. To produce a more effective pedalling action the rider must ride off the seat.

Hybrid/citybike Due to consumer reaction against the abovementioned disadvantages associated with the mountain bikes, the"hybrid"style bike has emerged, whilst citybikes continue to be used in Europe and Japan for many years.

These bikes have a higher handle bar and create less of the bent spine position in comparison to the mountain bikes. But they do not position the rider to receive the correct anatomical support and still place the rider too far forward to achieve optimum ease and efficiency in pedalling.

Exercise equipment Exercise/stationarybicyclesandexerciseequipmentthataredesign edforthe users to pedal in a fitness session, lack the capacity to position the riders to receive correct anatomical support. They do not provide sufficient adjustment of the seat to cater for a large range of different rider physiques.

Recumbent style bike Recently recumbent style bikes have been developed in an attempt to overcome disadvantages caused by the mountain bikes and the hybrid/citybikes.

This type of bikes places a rider in an almost prone position, with the pedals far forward of the rider's body. Whilst recumbent bikes provide a more efficient pedalling action, and greater support and comfort in seating, they are difficult to

control and manoeuvre. They also have a safety problem as they are so low that drivers of vehicles have difficulty seeing them. As with other bikes, they lack sufficient seat adjustment to suit varying rider physique.

These bikes are also difficult to park, store, ship and transport.

OBJECT OF THE INVENTION An object of the invention is to substantially alleviate or to reduce to a certain level one or more of the prior art disadvantages.

SUMMARY OF THE INVENTION In one aspect therefore the present invention resides in a pedallingapparatus including a frame assembly having a front section and a rear section with a hollow seat tube, and a seat post supported by said seat tube and including attachment means for attaching a seat for a user to sit on while pedalling, the seat post and the seat tube being arranged for supporting the seat, when attached, at an adjustable position relative to the rear section. The seat tube has a substantially curved part arranged to accommodate therein a compatible curved part of the seat post, and the curved parts of the seat tube and the seat post are configured for telescopic adjustment of the position of the attached seat along a curved trajectory path extending upwardly and rearwardly relative to said rear section. Thereby, the seat position is selectively adjustable to suit any one of a range of users of different heights and physiques.

Desirably, the pedalling apparatus further comprises a pair of pedals for pedalling, and the seat post and the frame assembly are arranged so that the user sitting on the seat is sufficiently far enough behind the pedals to give the legs an uncramped and efficient pedalling action and places the user in a substantially upright pedalling position.

The pedalling apparatus accordingly to this invention is suitably arranged to provide adjustability to the seat position for the user in order to suit his/her individual physique and to allow him/herto receive correct anatomical supportand to have an efficient pedalling action whilst using a variety of front frame designs and handlebar types to suit the riders's personal preference in his/her ultimate riding style.

Such sitting position removes the requirements of the front horn or pommel usually found in the seat of the prior art pedalling apparatus. A suitable seat for this invention is subject of the applicant's United States Patent No. 6,045, 180, disclosure of which is fully incorporated herein by reference.

The pedalling apparatus typically has an adjustably positionable handlebar provided at the front section of the frame assembly. Adjustable positioning of the user behind the pedals in combination with the adjustable handlebar permit the user to obtain a seat position for a correct anatomical support. This also helps to remove pressure from the hands and arms.

The frame assembly may have a down tube arranged for supporting the handlebar. In one form the pedalling apparatus includes a head tube at said front section of the frame assembly and a handlebar stem having one end arranged for securing the handlebar and opposite end arranged for fixing in the head tube and adjustably positionable relative to the head tube. In this manner the height of the handlebar can be adjusted to suit each individual user.

The handlebar may have a substantially U-shaped mid section with a handle grip at each free end thereof. Said one end of the handlebar stem may be arranged so that the mid section of the handlebar is rotatable to a desired orientation before being secured at said orientation. This provides a fore and aft adjustment of the handlebar grips.

It is preferred that the seat is arranged to be tiltable relative to the seat post so that its tilt orientation relative to the seat post can be selectively adjusted.

Clamping means may be advantageously provided for clamping the seat post to said seat tube at any of said adjustable position.

The pedalling apparatus accordingly to this aspect of the invention can thus provide customised adjustment of the seat position upwardly and rearwardly with a single adjustment action. The arrangement of the seat post and the frame assembly can be made so that the seat position can be adjusted to suit a relatively large range of the height and physique variance in users. As such, manufacturers, wholesalers and retailers need to stock only two frame sizes for the height and physique variance expected in all users.

BRIEF DESCRIPTION OF THE DRAWINGS In order that the system of the present invention can be readily understood and put in practical effect the description will now refer to the accompanying drawings which illustrate non-limiting embodiments of the present invention and wherein:- Figure 1 is a schematic diagram showing a side view of a pedal bicycle according to the present invention; Figure 2 shows details of the arrangement for adjusting the seat of the bicycle shown in Figure 1 in the curved trajectory path; Figure 3 is a front view of the arrangement shown in Figure 2; Figures 4 and 5 show details of the handlebar of the bicycle shown in Figure 1; Figure 6 shows the bicycle of Figure 1 adjusted for use by a person of 1.5 metre height; and Figure 7 shows the bicycle of Figure 1 adjusted for use by a person of 1.88 metre height.

DETAILED DESCRIPTION OF THE DRAWINGS Referring initially to the pedalling apparatus according one embodiment of the present invention shown in Figure 1, there is shown a pedal bicycle 10 being used by a rider 100. The bicycle 10 has a frame assembly formed by a substantially curved seat tube 12 and a down tube 14, a seat 16 secured to a substantially curve seat post 18, a handlebar 20 secured to a handlebar stem 22 which is locked in a selected height within a head tube 24 of the frame assembly, and a pair of pedals 26 joined to respective crank arms 28.

As can be seen the rider 100 is seated well behind the pedals 26. Using the handlebar 20 with raised handgrips the rider 100 can pedal with a substantially straight back and has a correct anatomical support. In this position the rider 100 can pedal with optimum efficiency and power.

Turning to Figures 2 and 3, the seat 16 for this embodiment does not have the usual pommel as the rider 100 is supported by the ischial tuberosities. This seat 16 is based on the seat disclosed in the applicant's abovementioned United States patent.

The seat 16 is supported on an upstanding stud 30 by a clamping arrangement 32. The stud 30 and the clamping arrangement 32 are configured to allow a ceratin range of tilt adjustment of the seat 16. As the stud 30 is fixed to the upper end of the seat post 18, positioning of the post 18 relative to the seat tube 12 allows adjustment of the seat 16 in both the height and the fore/aft dimensions.

Whilst not shown, it is understood that a clamping device is used to clamp the post 18 to the tube 12 in a position selected by the rider. The curvature tube 12 and the post 18 determine a curved trajectory as shown by the dotted line in Figure 2. The trajectory is determined to allow the bicycle 10 to be used in comfort by a large range of body physiques.

Turning to Figures 4 and 5 the handlebar 20 for this embodiment has a <BR> <BR> substantially U-shaped midsection 34 and handgripsextendingoutwardlyfromfree ends of the mid section 32. A brace member 38 is joined to the two arms of the mid section 32. The handlebar 20 is fixed in position by the handlebar stem 32, the height of which can be adjusted by positioning into the head tube 24 to a desired height and fixing it in that position by means well known in the art. As shown in Figure 4 the angular position of the handlebar 20 can also be adjusted by rotating the handlebar 20 and then fixing it in the desired angular position.

Figure 6 shows the bicycle 10 being used by a rider 100 who is 1.5 metre tall. For comfort ridingthe post 18 is positioned substantially fully into the tube 12.

For a user about 1.88 metre tall the post 18 is in an extended position as shown in Figure 7. In both positions the respective riders are correctly supported and can pedal with optimum efficiently.

The inventor has used a computerised design process involving the use of anthropological data and biomechanical analysis on"Human Scale"modelling software to determine the geometry and the dimensions for (a) the bicycle frame, (b) the seat tube and seat post, (c) the pedals and cranks, and (d) the handle bar

stems and the handle bars, to enable riders of all physiques to be seated in individual optimum riding positions, and to make fine adjustment to the seat position along said curve trajectory path suit differences in each rider's torso length, leg length and arm length.

Factors for the individual optimum riding position include the combination of: (a) having the rider's body receiving skeletal support from directly beneath the ischial tuberosities (sit bones); (b) being positioned sufficiently rearward relative to the pedals for removing or at least minimising cramping of the rider's legs and to provide maximum leverage from the legs for optimising pedalling efficiency; (c) eliminating any interference with the legs during pedalling ; (d) removing pressure from the hands, arms and shoulders ; and (e) eliminating cramping of the diaphragm and restriction of lung function (breathing).

Human measurements, derived from the computerised design process, have shown that only two frame sizes of the apparatus manufactured to the present invention would be needed to provide sufficient adjustments of the seat position (riding position) to suit riders of all heights and physiques. A smaller frame can be made to suit riders up to 5'10"and a larger frame to suit riders from 5'8"and taller. The overlap between the two frame sizes is intended to cater for riders of the same height but having different arm lengths, leg lengths and torso lengths.

Whilst the above has been given by way of illustrative example of the present invention many variations and modifications thereto will be apparent to those skilled in the art without departing from the broad ambit and scope of the invention as herein set forth.