To an appreciable extent modern cyclists have a desire for extra equipment or specific mechanisms for making possible, among other things, adjustment or adaption of the sitting or riding position, depending on the road surface or type of terrain concerned. Adjustability of the elevation of the bicycle handlebar is of much interest in this connection.

From Norwegian patent 165.332 there is known an adjustable and lockable mechanism for positioning the handlebar at a desired height. During such height adjustment a rotation of the handlebar about a horizontal axis takes place. This solution is rather complicated and results in an expensive design, which is generally only of interest to very advanced cyclists who want particular refinements and adjustment possibilities when riding. The present invention is directed to a device for height adjustment of a bicycle handlebar, being of a simple and inexpensive, but simultaneously functional and reliable design, in order to obtain substantially corresponding adjustment possibilities as previously known structures. According to the invention this is obtained with a device as more closely defined in the claims.

In the following description the invention will be explained in more detail with reference to the drawing, which shows in side elevation and partial cross section, an embodiment of the device according to the invention.

In the drawing two main parts are shown, namely a support member 1 and an arm mechanism 4. The support member 1 has a post 3 adapted to be mounted in the frame or steering tube of the bicycle concerned, as is common practice. The outer end of arm mechanism 4 in the usual manner has mounting means 20 for rigid attachment of the handlebar, whereby the attachment, for example in a manner known per se, can take place by means of a clamping effect. A transverse pivot axle 10 serves to interconnect the support member 1 and the arm mechanism 4, so that these two

parts will be angularly adjustable in relation to each other and thereby make possible a height adjustment of the handlebar.

In the embodiment shown here arm mechanism 4 can be selectively fixed in three different, pre-determined angular positions, corresponding to three radial recesses, 5A, 5B, and 5C in a boss 5 which forms a projecting portion of the support member 1.

The axle 10 runs centrally through this boss 5 and the recesses 5A-C lie on the arc of a circle about the axle 10. The adjacent or inner end portion of the arm mechanism, which suitably clamps the boss 5 at either side, also has a curved inner surface being adapted to conform more or less to the outer circumference of boss 5 in which recesses 5A-C are formed. Inside the main part of the arm mechanism, and lying generally in the longitudinal direction thereof, there is provided a locking bolt 7 having an end portion 7A adapted to enter into recesses 5A, 5B and 5C. In the position shown in the drawing the locking bolt engages recess 5A. A compression spring 8 is adapted to urge locking bolt 7 in such a direction that the end portion 7A thereof tends to move in a direction towards axle 10. Preferrably the longitudinal axis of the locking bolt is directed towards the axis of axle 10. An important component in the device shown in the draw¬ ing, is an operating lever 9 protruding from arm mechanism 4 and adapted to be able to retract locking bolt 7 against the effect of compression spring 8, so that end portion 7A of locking bolt 7 is released from the recess concerned, for example recess 5A. Then the arm mechanism 4 can be angularly adjusted to another desired elevation of the handlebar, for example an intermediate position with the locking bolt inserted into recess 5B. This retraction of the locking bolt in order to make possible the new angular position and height adjustment, may take place by moving operating lever 9 in one or the other direction, depending upon the mechanical connection between the inner part of the operating arm and the locking bolt 7.

In a possible embodiment the radial recesses 5A-C are in the form of conical bores in boss 5, whereby the end portion 7A of the locking bolt has a correspondingly conical shape so as to fit into the bores. In a preferred embodiment, however, as illustrated in the drawing, recesses 5A-C are formed as transverse grooves or depressions extending parallel to the axle 10, preferrably through the whole width of boss 5. The end portion 7A of the locking bolt in this variant has a flat, tongue-like shape corresponding to grooves 5A-5C. A form somewhat tapered inwardly in a direction towards axle 10, is also preferred in this case.

The main part of arm mechanism 4 preferrably has a hollow cross section which can be substantially closed so as to constitute a more or less sealed casing around the interior mechanism, in particular locking bolt 7 with its associated spring 8.

Integrated with the main parts of support member 1 and arm mechanism 4 in the cooperating portions about axle 10, there are suitably provided end stop elements 11 and 12 for restricting the angular range within which arm mechanism 4 can move. The element 11 can be quite simply in the form of a planar portion of the support member, whereby a cooperat¬ ing surface portion of arm 4 will engage with surface element 11 in its upper end position. End stop element 12 for the lower end position can be in the form of a stopping shoulder against which the end portion 7A of the locking bolt abuts when the bolt has been retracted to its opposite position, or bottom position in relation to the one shown in the drawing. Thus these end stop elements 11,12 constitute safety means against unintended angular movement downwards or upwards beyond reasonable and secure limits.

Operating lever 9 is perhaps somewhat unrealistically shown in the drawing, but it is obvious that such a lever can be directed in any desired direction, for convenient operation during cycling. It is preferred, however, accor¬ ding to the invention, to arrange operating lever 9 in such a manner that it protrudes laterally from arm mechanism 4,

for example more or less parallel to the adjacent portion of a handlebar being attached in the mounting member 20. When operating lever 9 in this way lies relatively closely adjacent to such a portion of the handlebar, the operation will be convenient and safe, in particular when the lever i adapted to release the locking at a given angular position, by pressing the lever in a direction towards the adjacent portion of the handlebar.