The invention relates to a motorcycle cruise con ^¬ trol system intended for cooperation with a rotary throttle grip of a motorcycle, comprising a clamping device with a stationary clamping part and a movable clamping part which is movable between a clamping position for clamping the throttle grip and maintaining it in a desired rotary posi ^¬ tion, and a release position allowing a rotation of the throttle grip, an operating mechanism for moving the movable clamping part between its clamping and release positions and a holding arrangement for holding the clamping device sub ^¬ stantially stationary with respect to the motorcycle.

Such a motorcycle cruise control system is known from US 2003/0047372 Al . In this known system the operating mechanism involves an operator (motorcyclist) which has to push the movable clamping part towards the stationary clamping part, upon which a pin connected to the stationary clamping part will cooperate with a hole provided in a spring plate connected to the movable clamping part for keeping these clamping parts together. The holding arrange- ment of this known system comprises a rather complicated as ^¬ sembly of connecting arms which connect the stationary clamping part to a part of the motorcycle.

It is an object of the present invention to pro ^¬ vide an improved motorcycle cruise control system.

Thus, in accordance with the present invention a motor cycle cruise control system is provided which is char ^¬ acterized in that the operating mechanism comprises an ec ^¬ centric mechanism with a first arm and a second arm of which respective first ends are pivotably connected to the sta- tionary clamping part and movable clamping part, respec ^¬ tively, and of which the second ends are pivotably connected to each other.

Such an eccentric mechanism is very effective in maintaining the movable clamping part in its clamping posi- tion once the dead centre position of the eccentric mecha ^¬ nism has been passed by the first and second arms. Moreover such an eccentric mechanism, when suitably dimensioned, al ^¬ lows an easy transition between its extreme positions (posi- tions in which the movable clamping part is in its clamping position and release position, respectively) .

In one embodiment one of the first and second arms is provided with an operating extension intended to be manu ^¬ ally operated by a motorcyclist. For example, the first arm which is pivotably connected to the stationary clamping part, is provided with said operating extension. Using this operating extension the motorcyclist can easily operate the eccentric mechanism for selecting the clamping position of the movable clamping part once the rotary throttle grip has assumed the desired rotary position, and for selecting the release position of the movable clamping part in which the throttle grip can rotate (be rotated) freely.

It is noted that for safety reasons it may be ad ^¬ visable that the design of the clamping parts is such that also in the clamping position a rotation of the throttle grip is possible when the motorcyclist applies a torque on the throttle grip above a predetermined level.

In another embodiment of the motorcycle cruise control system according to the present invention, the hold- ing arrangement comprises a forked part attached to the sta ^¬ tionary clamping part with fork arms which are spaced such that a brake lever of the motorcycle can be received between the fork arms without impeding the braking movement of said brake lever. This results in an simple yet effective design of the system which uses no complicated parts and which, therefore, may be mounted easily to the motorcycle without the need for special tools.

When such an embodiment is provided, it further may be favourable when one of the first and second arms of the eccentric mechanism in the clamping position protrudes into the space between the fork arms in such a manner that said arm will be engaged by the brake lever when latter moves to a braking position, thus moving the eccentric mechanism towards its position in which the movable clamping part of the clamping device is in its release position.

Such an embodiment ensures that the movable clamp ^¬ ing part will automatically move towards its release posi ^¬ tion when the braking lever is operated. This enhances the safety of the system.

In a special embodiment of the motorcycle cruise control system the first arm which is pivotably connected to the stationary clamping part, is provided with an operating extension intended to be manually engaged by a motorcyclist, wherein said first arm in the clamping position of the mov- able clamping part protrudes into said space between the fork arms. Thus the operating lever allows to position the (movable clamping part of the) system in its release and clamping positions, whereas the braking lever, when operated, may engage the protruding part of the first arm for moving the (movable clamping part of the) system automati ^¬ cally towards its release position.

In other embodiments at least one of the fork arms may be settable for setting the spacing between these fork arms, and at least one of the stationary and movable clamp- ing parts may be settable for setting the spacing between these parts in the clamping position. This allows the system to be adjusted taking into account specific dimensions of the braking lever and rotary throttle grip, respectively, of the motorcycle for which the system is meant.

It is conceivable, for example, that the station ^¬ ary clamping part is settable.

In a practical embodiment, the motorcycle cruise control system according to the present invention comprises a frame defining two fork arms which are spaced such that a brake lever of the motorcycle can be received between the fork arms without impeding the braking movement of said brake lever, which frame pivotably carries the movable clamping part and settably carries the stationary clamping part, and wherein the first end of the first arm and the movable clamping part are pivotably connected to said frame.

Such a frame allows to define the relative posi ^¬ tion of the constitutive parts of the system in an easy man ^¬ ner .

It is conceivable then, that the stationary clamp- ing part comprises at least one opening through which a re- leasable locking member, such as a bolt, screw or alike, ex ^¬ tends which also extends through a corresponding hole in the frame, and wherein at least one of the opening and hole has an elongate shape. This allows an easy adjustment of the stationary clamping part for coping with a specific diameter of the throttle grip, by loosening the locking member, displacing the stationary clamping part (while sliding the locking member along the elongate hole and/or opening) and again tightening the locking member.

For an increased stability of the stationary clamping part, it may comprise two openings with correspond ^¬ ing locking members extending through two holes in the frame .

In yet another embodiment of the motorcycle cruise control system, said frame defines a fully surrounded open ^¬ ing intended for receiving the rotary throttle grip of the motorcycle, wherein the stationary and movable clamping parts protrude into said opening. Such a fully surrounded opening makes the frame very stiff.

Further it is possible that one fork arm comprises a settable fork arm part which comprises at least one open ^¬ ing through which a releasable locking member, such as a bolt, screw or alike, extends which also extends through a corresponding hole in the frame, and wherein at least one of the opening and hole has an elongate shape. This allows an easy adjustment of the settable fork arm part for coping with a specific dimension of the braking lever, by loosening the locking member, displacing the settable fork arm part (while sliding the locking member along the elongate hole and/or opening) and again tightening the locking member.

Again, it is favourable for an increased stability of said settable fork part, that the settable fork part com ^¬ prises two openings with corresponding locking members ex ^¬ tending through two holes in the frame.

Hereinafter the invention will be elucidated while referring to the drawing, in which:

Figure 1 shows a first embodiment of the system according to the present invention in an inoperative, non- clamping position;

Figure 2 shows said first embodiment of the system according to the present invention in an operative, clamping position;

Figure 3 shows a second embodiment of the system according to the present invention in an inoperative, non- clamping position, and

Figure 4 shows said second embodiment of the sys ^¬ tem according to the present invention in an operative, clamping position.

The motorcycle cruise control system illustrated in the figures is intended for cooperation with a rotary throttle grip 1 (shown in cross section in figures 1 and 2) of a motorcycle, of which in the figures 1 and 2 also the braking lever 2 (also shown in cross section) has been represented .

Firstly referring to the first embodiment illus ^¬ trated in the figures 1 and 2, the system basically com ^¬ prises a clamping device with a stationary clamping part 3 and a movable clamping part 4 which is movable between a clamping position (figure 2) for clamping the throttle grip 1 and maintaining it in a desired rotary position, and a re- lease position (figure 1) allowing a rotation of the throt ^¬ tle grip, an operating mechanism 5 (to be elucidated below) for moving the movable clamping part 4 between its clamping and release positions and a holding arrangement 6 for hold- ing the clamping device substantially stationary with re ^¬ spect to the motorcycle.

The system comprises a frame 7 to which all its constitutive parts are attached in a manner described below. The frame 7 may comprise two similar frame plates positioned at some distance for receiving there between the remaining constitutive parts of the system.

The operating mechanism 5 comprises an eccentric mechanism with a first arm 8 and a second arm 9 of which respective first ends are pivotably connected at pivots 10 and 11 to the stationary clamping part 3 (via the frame 7 which, as will appear later, also carries the stationary clamping part) and movable clamping part 4, respectively. The second ends of the arms 8 and 9 are pivotably connected to each other at pivot 12.

The first arm 8 is provided with an operating ex ^¬ tension 13 which may be operated manually by a motorcyclist, as will appear later.

The movable clamping part 4 is pivotably connected to the frame at pivot 21.

The holding arrangement 6 comprises a forked part with two fork arms 14 and 15 which are part of the frame 7 and thus are attached to the stationary clamping part 3. These fork arms 14,15 are spaced such that the brake lever 2 of the motorcycle can be received between the fork arms without impeding the braking movement of said brake lever.

Fork arm 14 comprises a settable fork arm part 16 which comprises two elongate openings 17 through which re- leasable locking members 18, such as bolts, screws or alike, extend which also extend through corresponding holes in the frame 7. As a result the fork part 16 can be set for varying the distance (spacing) between the fork arms 14 and 15 for coping with brake levers 2 with different dimensions.

The stationary clamping part 3 likewise comprises two elongate openings 19 through which two releasable lock- ing members 20, such as a bolts, screws or alike, extend which also extend through corresponding holes in the frame 7. As a result the stationary clamping part 3 can be set relative to the frame 7 for varying the distance (spacing) between the clamping parts 3,4 in the clamping position of the movable clamping part 4 for coping with throttle grips with different diameters.

The frame 7 further defines a fully surrounded opening 21 intended for receiving the rotary throttle grip 1 of the motorcycle, wherein the stationary and movable clamp- ing parts 3,4 protrude into said opening.

As shown clearly in figure 2, the first arm 8 of the eccentric mechanism in the clamping position protrudes into the space between the fork arms 14,15 in such a manner that said first arm 8 will be engaged by the brake lever 2 when latter moves to a braking position, thus moving the eccentric mechanism towards its position (according to figure 1) in which the movable clamping part 4 of the clamping device is in its release position.

The operation of the system is as follows. Start- ing in the release position according to figure 1 (in which the movable clamping part 4 is at such a distance from the stationary clamping part 3 that the throttle grip 1 can rotate freely) the motorcyclist rotates the throttle grip 1 to a desired speed position and then moves (rotation around pivot 10) operating extension 13 downward (towards the throttle grip) , as a result of which the eccentric mechanism moves beyond its dead centre position (in which pivots 10, 11 and 12 are aligned) to the clamping position of the mov ^¬ able clamping part 4 (in which the movable clamping part 4 has been rotated around pivot 21 and is at such a smaller distance from the stationary clamping part 3 that the throt ^¬ tle grip 1 cannot rotate freely) as illustrated in figure 2.

For again moving the system to the release posi ^¬ tion, there are two options. The first option is to manually lift the operating extension 13 (rotation around pivot 10 away from the throttle grip) and thus lifting the movable clamping part 4 by a rotation around pivot 10. The second option includes moving the brake lever (in figure 2 to the right), as a result of which it will engage the part of the first arm 8 which protrudes into the space between the fork arm 14 and 15, thus rotating the first arm around pivot 10 beyond the dead centre position of the eccentric position (towards the position according to figure 1) and again lift ^¬ ing the movable clamping part 4.

Referring to figures 3 and 4, a second embodiment is illustrated which has a number of parts similar to the first embodiment ( indicated by the same reference numbers). There are, however, a few differences: firstly the settable fork arm part 16 has been omitted. Secondly, the frame 7 now does not extend continuously around the throttle grip re ^¬ ceiving opening, but is provided with a pivotable frame part 22 with pivot 23 which by means of a set screw 24 may be set for coping with throttle grips with different diameters. As a result, the stationary, settable clamping part now is de- fined by said frame part 22 (whereas frame part 3 of the first embodiment has been omitted) .

The invention is not limited to the embodiments described before which may be varied widely within the scope of the invention as defined by the appending claims.