DE3607951A1 - Variably adjustable handlebar shaft as lifting mechanism in twin handlebar stems for bicycles, motor cycles etc. - Google Patents

Abstract

The invention "variably adjustable handlebar shaft as lifting mechanism in twin handlebar stems for bicycles, motor cycles etc." offers a solution to the problem of adjusting the height of and of positioning the handlebars of a two-wheeler as required with the lowest conceivable complexity. This gives a practical gain for touring with its changing requirements for the rider's posture and with different riders (individual adaptation of the height of the handlebars). The variability is achieved by the additional introduction of a second handlebar stem, the horizontal fixing by guide grooves and elements and specific cross-sections, the vertical fixing by a locking screw or gear crank.

Description

Ideally, 3 positions are assumed when cycling:

• 1. upright posture (raised handlebar),
• 2. the relaxed 45 ° posture (training bar, Racing wheel),
• 3. the stooped posture (racing wheel).

In practice, especially on tours, it is now evident that alternating use of all 3 positions can be useful

• - with headwind (position 3),
• - when driving fast (position 3),
• - for the changing load on the spine and relief of the Hands (position 1-3).

In addition, setting the correct handlebar height depends on Height of the rider when buying and renting a bike Trouble.

The previous solutions are (with one exception) at Modification of the handlebars themselves:

• 1. The classic racing handlebars offer positions 2 and 3. Wanting to use it for position 1 also causes problems and aesthetic problems. For some cyclists it is very negative.
  The modification, for example in DE 31 39 861, has to deal with considerable aesthetic concerns.
  Other solutions go in the direction of variability by means of joints, etc. Examples of this are DE 31 07 502, DE 29 31 826, DE 29 30 206. These approaches to problem solving raise questions about stability and durability in continuous operation. In addition, the driver remains restricted to one type of handlebar.
• 2. The telescope solution (DE 29 18 200) is not while driving operable and requires a modification of the frame.

So the task is

• 1. enable a variable handlebar adjustment in height,
• 2. The selection of different handlebar types guarantee,
• 3. doing stability and durability and
• 4. to ensure the height adjustability while driving,
• 5. one with the given standardized dimensions as an accessory  to design a suitable piece for every common bicycle and its use by simply replacing it without direct Interventions on the bicycle frame by anyone with the simplest Funds is possible.
• 6. to find an aesthetically pleasing solution.

This problem is solved by introducing a GR 2 in GR 1, which is fastened in the lower part (about a fifth) by means of a shortened internal clamp (see Fig. 3, point 4 ) with a cast cone. This internal clamping is carried out by a welded-in sleeve with an internal thread, a screw running in it and the cast cone. The part that remains free then moves the actual LS, which is somewhat thinner than usual, with the stem at the top.

There are two requirements:

• 1. the fixation in the horizontal,
• 2. the fixation in the vertical

Re 1: The horizontal fixation is carried out by two guide elements (screws or welded nipples) (see 2 a and 2 b) , which are embedded in the upper reinforced part of the GR 2 (see Fig. 1 and 3) on the left and right and protrude about 1.5 mm into the interior of the GR 2 and thus into the 2 longitudinal grooves milled into the corresponding position in the LS (see Fig. 2, point 5 ). For safety reasons, the lower 6 cm are excluded. The LS moves up and down as if on guide elements. Of the two guide elements attached one above the other, the lower ones must be positioned so that they only allow the handlebar shaft to be pulled out or screwed out as far as a safety point. If the two lower guide elements are damaged, a double mark (stop, dash) signals the end of the possible stroke.
2: The desired height can be fixed in two ways:

• 2.1 Sleeve with screw thread ( Fig. 1 and 2, point 4 ), which is welded into the upper, reinforced area of the GR 2. The locking screw must be rounded off at the end so that it can engage in the circular recesses (see point 1 ) on the back of the LS and thus hold the LS. These recesses are to be made regularly and close together, so that the user can set the stroke appropriately even after inspection. If the stroke is changed, the screw is loosened and tightened again for positioning.
• 2.2 The second possibility of vertical movement and fixing is shown in Fig. 5: A crank moves a gear. This runs in a warehouse that is connected to GR 2 where it emerges from GR 1. The gear wheel engages in a notch, which is attached to the back of the LS, again with the exception of the last about 6 cm. The crank is locked in a side compartment as part of the cap on the gear bearing (see Fig. 6, point 6 ).

Both detection options act as additional horizontal fixation.

The requirement for easy assembly is according to the previously presented Given designs. Since the individual parts are prefabricated, the user needs for the assembly except for a small and a long screwdriver is not a special tool. Other variants are conceivable:

• 1. Instead of the groove guide for horizontal fixation, a cross-section according to Fig. 8 and 9 or Fig. 7 can also be selected.
• 2. Fixed installation of the mechanisms described above in a appropriately prepared GR that functions as GR 1 and GR 2 united. The advantage would be one Sizing to choose, which at the same time great security and allows a fair overall aesthetics of the bike.
• 3. The normal LS is about 2-3 cm away in the direction of travel one GR 3 that, unlike GR 2, fixes one can have a slightly larger cross section. Then runs in GR 3 the LS in the manner described above and will also like Positioned above horizontally and vertically.

Claims (11)

1. Variably adjustable handlebar shaft as a lifting mechanism in 2 steerer tubes for bicycles, motorcycles etc., characterized in that a tube (here GR 1), a tube (here GR 2) is attached in the steerer tube of the frame, in which the handlebar shaft (here LS) running. 2. Device according to claim 1, characterized in that in the lower fifth of GR 2 with a sleeve Internal thread is welded in such a way that with The screw and cast cone are used for internal clamping can. 3. Device according to claim 1, characterized in that that in the upper reinforced part of the GR 2 left and right and one above the other 2 guide elements for the LS are embedded. 4. The device according to claim 1, characterized in that in LS left and right each a guide groove is incorporated with the exception of the lower approximately 6 cm. 5. The device according to claim 1, characterized in that by the in the reinforced part of the GR 2 Sleeve with screw thread positioning he follows. 6. Device according to the preceding claims, characterized characterized that in LS at the back circular Depressions are milled. 7. The device according to claim 1, characterized in that that connected to GR 2 by means of a gear crank with the notch on the back of the LS the positioning he follows.   8. The device according to claim 7, characterized in that that finding by folding the crank in a side compartment of the crank bearing block is made. 9. The device according to claim 1, characterized in that a polygonal or shaped according to Fig. 7 cross section of GR 2 and LS ensures the horizontal positioning. 10. Device according to the preceding claims, characterized in that the steerer tube of the Bicycle frame in an enlarged cross section and after one Modification carried out according to the patterns described above is used for the mechanism described. 11. The device according to the preceding claims, characterized in that a commercially available LS additional steerer tube (here GR 3) is attached in which then the actual LS runs.