Home trainer

Abstract: The invention relates to a home trainer designed to accommodate a bicycle, comprising a brakable drive roll incorporated in a frame, which can be mounted in a friction coupling with a driven wheel of the bicycle. The frame is provided with a sub-frame that is rotatable about a first pivoting point, the drive roll being mounted in the sub-frame. The frame is further provided with a handle rotatable about a second pivoting point, which is adjustable between an operational position wherein the handle pushes the sub-frame towards the wheel such that the drive roll and the wheel maintain the friction coupling, and a neutral position wherein the handle releases the sub-frame such that the drive roll and the wheel do not engage

Description: The invention relates to a home trainer designed to accommodate a bicycle, comprising a brakable drive roll incorporated in a frame, which can be mounted in a friction coupling with a driven wheel of the bicycle. Such a home trainer is known in practice. One problem with the known home trainer occurs when changing the bicycle mounted in the home trainer; positioning the drive roll such as to realize the desired friction coupling with the driven wheel of the bicycle involves some rather complicated operations. Another problem is that the required cycling energy to be produced by the user when using the home trainer is usually adjusted by means of a brake which is susceptible to wear. EP-A-0 818 220, US-A-5,382,208 and US-A-574,167 each indepently teach a home trainer in accordance with the introduction wherein on the frame a sub-frame is provided that is rotatable about a first pivoting point, the drive roll being mounted in the sub-frame, and in that the frame is further provided with a handle rotatable about a second pivoting point, which is adjustable between an operational position wherein in use the handle pushes the sub-frame towards a driven wheel such that the drive roll and a driven wheel maintain the friction coupling, and a neutral position wherein in use the handle has released the sub-frame such that the drive roll and a driven wheel do not engage. The home trainer according to the invention is characterized in that the handle is provided with an adjustable tuning knob for determining the position of the sub-frame in the operational position, and that at the side directed towards the sub-frame, the tuning knob is provided with a bush, and in that the sub-frame has a sliding rim designed to intermate with the bush, the sliding rim terminating in a recess which, when the bush is placed therein, determines the operational position of the handle. Among other things, this measure provides a very simple manner of changing a bicycle, while reliably and easily realizing a suitable friction coupling between drive roll and bicycle wheel, even if the newly mounted bicycle has different wheel sizes. The trainer of the invention can be manufactured at low cost. In a further aspect of the invention the home trainer is characterized in that the drive roll is coupled with a flywheel that conducts at least partially magnetic lines of flux, and in that further a position-adjustable magnet is provided which is located near the flywheel. In this manner a wear-resistant brake is provided, allowing the continuous adjustment of the home trainer to a desirable load such as requisite for the rotation of the drive roll. This is preferably achieved by the magnet being adjustable to a position between a neutral position near a pivoting point of the flywheel and a maximal brake position near the outer circumference of the flywheel. Desirably, the flywheel is provided with recesses, preferably over a periphery located near the neutral position of the magnet. In this manner a very effective cooling of the flywheel is obtained. It is further preferred that the flywheel comprise an aluminium disc and moreover, that the flywheel be substantially made of steel. The control of the home trainer according to the invention may be embodied simply such that the magnet is coupled with a spring-loaded cable and that the magnet is adjustable by operating the cable. The invention will now be elucidated with reference to the drawing, which in Figures 1 and 2 shows a detailed side view of the home trainer according to the invention in neutral and operational position, respectively; in Figure 3, shows a cross-sectional detail of the home trainer according to the invention relating to the brake facility; and in Figure 4, shows a cross-sectional top view (mirror image) of the brake feature of the home trainer according to the invention. Identical reference numbers used in the figures refer to similar components. The person skilled in the art and the public, are completely familiar with the embodiment of the home trainer as such, so that no further elucidation is called for. The home trainer according to the prior art and according to the invention comprising among other things, a frame 1, which includes a supporting leg 2. At the end of the supporting leg 2 a foot 3 is provided which rests on a floor. A home trainer of this kind is embodied such as to be able to accommodate a bicycle. Of this bicycle, Figures 1 and 2 show the tyre 4, which is usually fitted around the driven rear wheel of the bicycle. The home trainer is further provided with a drive roll 5 to be placed in a friction coupling with the rear wheel 4 of the bicycle. Figure 1 shows the neutral position, while Figure 2 shows the operational position. In order to be able to change between the positions shown in Figure 1, and Figure 2, the frame 1 is equipped with a sub-frame 7 rotatable about a first pivoting point 6, with the drive roll 5 being mounted in the sub-frame 7. The frame 1 is further provided with a handle 9 which is rotatable about a second pivoting point 8, which handle is adjustable by moving it in the direction indicated by arrow A in Figure 1, between the neutral position shown in Figure 1 in which the handle 9 releases the sub-frame 7 such that the drive roll 5 and the wheel 4 do not engage, and the operational position shown in Figure 2, in which the handle 9 pushes the sub-frame 7 towards the wheel 4 such that the drive roll 5 and the wheel 4 maintain the friction coupling. Figures 1 and 2 further show that the handle 9 is provided with an adjustable tuning knob 10 for determining the position of the sub-frame 7 in the operational position. This facilitates an adjustment to the thickness or the diameter the rear wheel 4. At the side directed towards the sub-frame 7, the tuning knob 10 is further provided with a bush 11, and the sub-frame 7 has a sliding rim 12 which intermates with the bush 11 and which sliding rim 12 terminates in a recess 13, clearly shown in Figure 1, which recess 13, when the bush 11 is placed therein, determines the operational position of the handle 9. With further reference to the Figures 3 and 4 it is remarked, that the drive roll 5 is coupled with a flywheel 14 conducting at least partially magnetic lines of flux, while further a position-adjustable magnet 15 is provided which is located near the flywheel 14. The magnet 15 is adjustable to a position between a neutral position near a pivoting point of the flywheel 14 and a maximal brake position near the outer circumference 14' of the flywheel 14. To this end the magnet is coupled with a spring-loaded cable 16 which is adjustable by moving the same in the direction of arrow B, shown in Figure 4. By tensioning the cable 16, a spring 17 loading the cable 16 is retracted and the magnet 15 moves in the direction of the outer circumference 14' of the flywheel 14. In this position the flywheel 14 experiences a maximum braking deceleration. When easing the cable 16, the magnet 15 moves under the influence of the spring 17 in the direction of the neutral position near the pivoting point of the flywheel 14. Over a periphery located near the neutral position of the magnet 15, the flywheel 14 is preferably provided with recesses 18, which are clearly visible in Figures 1 and 2. These provide an effective cooling of the flywheel 14. It is further remarked, that the flywheel 14 is embodied with an aluminium disk 19, and that the remainder of the flywheel 14 is substantially made of steel.

Claims: A home trainer designed to accommodate a bicycle, comprising a brakable drive roll (5) incorporated in a frame (1), which can be mounted in a friction coupling with a driven wheel (4) of the bicycle, on which frame (1) a sub-frame (7) is provided that is rotatable about a first pivoting point (6), the drive roll (5) being mounted in the sub-frame (7), and the frame (1) is further provided with a handle (9) rotatable about a second pivoting point (8), which is adjustable between an operational position (Fig. 2) wherein in use the handle (9) pushes the sub-frame (7) towards a driven wheel (4) such that the drive roll (5) and the wheel (4) maintain the friction coupling, and a neutral position (Fig. 1) wherein in use the handle has released the sub-frame (7) such that the drive roll (5) and a driven wheel (4) do not engage, characterized in that the handle (9) is provided with an adjustable tuning knob (10) for determining the position of the sub-frame (7) in the operational position (Fig. 2), and that at the side directed towards the sub-frame (7), the tuning knob (10) is provided with a bush (11), and in that the sub-frame (7) has a sliding rim (12) designed to intermate with the bush (11), the sliding rim (12) terminating in a recess (13) which, when the bush is placed therein, determines the operational position (Fig. 2) of the handle (9). A home trainer according to claim 1, characterized in that the drive roll (5) is coupled with a flywheel (14) that conducts at least partially magnetic lines of flux, and in that further a positionadjustable magnet (15) is provided which is located near the flywheel (14). A home trainer according to claim 2, characterized in that the magnet (15) is adjustable to a position between a neutral position near a pivoting point of the flywheel (14) and a maximal brake position near the outer circumference (14') of the flywheel (14). A home trainer according to one of the claims 2-3, characterized in that the flywheel (14) is provided with recesses (18) preferably over a periphery located near the neutral position of the magnet (15). A home trainer according to one of the claims 2-4, characterized in that the flywheel (14) comprises an aluminium disc (19) and in that the remainder of the flywheel (14) is substantially made of steel. A home trainer according to one of the claims 2-5, characterized in that the magnet is coupled with a spring-loaded cable (16) and that the magnet (15) is adjustable by operating the cable (15).

Inventors: TACX JACOBUS HUBERTUS, TACX, JACOBUS HUBERTUS
Applicants: TECH IND TACX B V, TECHNISCHE INDUSTRIE TACX B.V.
Application year: 2001
Main classification: A63B69
IPC codes: A63B69, A63B21