Bicycle Head Tube Assembly

The present invention relates to a bicycle head tube assembly which effectively prevents transmission of shock waves from the front wheel of the bicycle to the handlebar.

The head tube of a conventional bicycle, as shown in FIG. 1, is generally comprised of a lug 51 connected to the head tube body 52 thereof by an unitary connecting tube 53 to hold the handlebar. As the bicycle runs over the rugged road, shock waves are directly transmitted from the bicycle frame to the handlebar, causing the hands to ache.

The present invention has been accomplished to provide a bicycle head tube assembly for a bicycle 15 which effectively eliminates transmission of shock waves to the handlebar during the running of the bicycle so that the rider's hands do not ache. According to the preferred embodiment of the present invention, the connecting device which connects the handlebar mounting lug to the head tube is comprised of a stack of resilient steel plates. The stack of resilient steel plates include a fixed steel plate at the top having two opposite ends welded to the lug and the head tube respectively, and a stack of suspension steel plates alternatively welded to the lug or the head tube and having a respective free end spaced from the lug or the head tube at a distance.

As the bicycle runs over a rugged road, the suspension steel plates are shaken to vibrate, and therefore shock waves are eliminated or lessened.

FIG. 1 is an elevational view of a bicycle head tube according to the prior art.

FIG. 2 an exploded view of bicycle head tube assembly according to the preferred embodiment of the present invention.

FIG. 3 is a cross-sectional view of the bicycle head tube assembly of FIG. 2 taken along line IV--IV.

FIG. 4 is an elevational view of the bicycle head tube assembly of FIG. 2.

Referring to FIGS. 2, 3 and 4, a bicycle head assembly in accordance with the present invention is generally comprised of a horizontal lug 2, a head tube 3, and a connecting device connected between the horizontal lug 2 and the head tube 3. The horizontal lug 2 comprises two opposite pairs of barrels 22 at two opposite sides of a split 21 thereof. The pairs of barrels 22 are connected by respective screw bolts 221 after the handlebar 5 is inserted through the lug 2, and therefore the handlebar 5 is connected to the head tube 3. The head tube 3 has a sloping top edge 32 sealed by an end cap 31. The bottom end of the head tube 3 is connected to the front forks (not shown). The connecting device which connects the lug 2 to the head tube 3 is consisted of a stack of resilient steel plates 4; 4'; 4''; 4'''; 40, covered within a soft covering 41. The top steel plate 4 has two opposite ends respectively welded at 42 to the lug 2 and the head tube 3. The other resilient or suspension steel plates 4'; 4''; 4'''; 40 are alternatively welded to the lug 2 at 42 or the head tube 3 at 42, having a respective free end spaced from the lug 2 or the head tube 3 at a distance 43. As shock waves are transmitted from the head tube 3 to the connecting device, the steel plates 4';, 4''; 4'''; 40 are caused to shake except the top steel plate 4, and therefore shock waves are lessened or eliminated.