DE8130180U1 - BICYCLE WITH CHAIN GEAR - Google Patents

Description

V

PATENTANWÄLTE gadderbaumer strasse 20

O-4800 BIELEPBLO 1

DIPL.-ING. BODO THIELKING
DU = L-INa OTTO ELBERTZHASEN

POST CHECK ACCOUNT: HAN 3O91 03-302 LEGAL FILES; 2138

Date: October 9, 1981

Applicant:

Julius Sprick _GmbH j _{Co KG}

Verier St. 430

4830 Gütersloh-Spexard

Description: Bicycle with chain attachment

The innovation relates to a bicycle with a derailleur / a switching mechanism for guidance, which is arranged below the gear rims on the side of the drive wheel the chain has parallel to the axis of the sprockets.

In known bicycles of this type, the derailleurs of the derailleur are particularly at risk / if the bike is to the Overturned side on which the derailleur is arranged. Most of the time, the bike rolls over when it tips over to the side via the rear derailleur or it hits the ground with the rear derailleur / which causes the rear derailleur to reduce the duration » sustains significant damage. The rear derailleur usually bends first from the direction parallel to the axis of the Sprockets out, which affects the shiftability of the derailleur, since the rear derailleur is usually inwards is bent away / you can then no longer bring the chain onto the outer sprockets * The chain jumps instead during the switching process usually still via the internal gear rims

2138-4-9 October 1981

to the inside and get stuck between the inner ring gear and the spokes, for example. Finally, damage to the rear derailleur can also result in permanent blockage the derailleur lead.

The innovation is based on the task / to avoid these disadvantages in bicycles with derailleur gears and one to propose appropriate protection of the Schlatwerk.

This object is achieved in a bicycle of the generic type according to the innovation in that the outside next to the rear derailleur a protective bracket firmly connected to the wheel frame is arranged.

The particular advantage of a bicycle according to the innovation is / that the protective bar is the endangered outside of the The rear derailleur and especially when turning to the side " tilting the bicycles keeps damaging shocks away from the rear derailleur by absorbing them and applying force to the Derived from the wheel frame. If you fall over, the bike rolls over the protective bar from / in to the side if it has fallen over Then the bike rests on the protective bar in the area of the drive wheel with the derailleur.

The protective bracket is expediently arranged approximately parallel at a distance from the switching mechanism / around the entire height of the switching mechanism to range. If the rear derailleur can be swiveled, which is usually the case / is the protective bar appropriately designed / that it shades the entire pivoting range of the rear derailleur towards the outside »It is sufficient / if the overlap of the rear derailleur by means of the switching bracket due to its special configuration / it is basically not necessary / the protective bracket To give a sector-like shape / rather a suitable curvature in a plane parallel to the pivot plane is sufficient of the rear derailleur in order to provide the rear derailleur with adequate protection in every possible swivel position by the protective bracket

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admit. The protective bracket is advantageously attached to the axle of the drive wheel and over the usual axle nut attached to the wheel frame. It is then advisable to provide an anti-twist device on the protective bar so that the Guard bar that overshadows the rear derailleur maintains.

Further advantageous features of the innovation emerge from the subclaims and from the following description.

The innovation is explained in more detail below with reference to the drawing using an exemplary embodiment. The drawing shows in a perspective view the driven rear wheel of a bicycle with derailleur.

In detail one recognizes in the drawing a hinted shown rear wheel 1 of a bicycle with derailleur, essentially showing the spokes of the rear wheel, omitting the rim and the tire. That Rear wheel 1 sits in what is known as the rear end 2 of the bicycle, this rear end is made up of two upwardly guided struts 2 and formed by two rear bracing struts 3 extending approximately horizontally to the front. The struts 2 and 3 lead to both Wheel sides each in a mounting plate 4 with mounting eyes and openings through which, among other things, a wheel axle 5 can be passed through. The wheel axle 5 is fastened to the fastening plate 4 by means of wheel nuts 6.

For the derailleur seat on the wheel axle 5 with the rear wheel 1 non-rotatably connected sprockets 7. About each one of the sprockets 7 is a chain 8 led away, the upper tension strand and the lower empty truiran with a further Are in connection with the gear rim arranged at the front of the wheel frame, which is connected to the usual pedal mechanism.

By moving the lower slack run parallel to the axial direction of the sprockets 7, the chain 8 can be moved from one to the other of the sprocket 7. Because of the different

2138 - 6 - October 9, 1981

borrowed diameter and number of teeth of the individual sprockets 7 there are different drive ratios for the rear wheel 1.

The shifting of the chain 8 parallel to the axial direction of the ring gears 7 is provided by a switching mechanism 9. This switching mechanism 9 is arranged essentially below the ring gears 7 on the relevant wheel side. It essentially consists of one Swivel arm 10, which in the exemplary embodiment on the in the direction of travel right-hand mounting plate 4 of the rear wheel assembly is attached. One connected to the mounting plate 4 Bolt 12 forms the pivot axis of the pivot arm 10. The pivot arm 10 carries guide wheels 11, which with the The slack side of the chain 8 'is in engagement. The guide wheels 11 are adjustable on the swivel arm 10 in the direction parallel to the axis of the ring gears 7. A corresponding adjustment mechanism the swivel arm 10 is actuated by a component pull 14. Depending on the extent of the ring gear 7 must be for one more or less land compensation of the chain 8 by (ten swivel arm 10, but sits on the swivel axis 12 of the swivel arm 10 a tension spring 13, which the chain over the swivel arm 10 tightens.

It is important that the guide wheels 11 each exactly in it must be possible to bring a level with the sprocket in question 7 on which the chain 8 is supposed to run. Therefore the derailleur 9 is particularly sensitive to lateral impacts that occur when the wheel tips over to the side of the Derailleur 9 are unavoidable.

To protect the rear derailleur 9 is therefore seated on the mounting plate 4 another protective bracket 15, which is guided past the switchgear 9 on the outside / that it protects against external impacts entire rear derailleur 9 shadows.

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The protective bracket 15 has a fastening tab 16 which placed on the wheel axle 5 and braced against the mounting plate 4 via the wheel nut 6. So that the Guard 15 its predetermined position relative to the switching mechanism 9 maintains, sits on the fastening tab 16 in the form of an additional screw 20, a rotation lock that a Pivoting of the entire protective bracket 15 about the wheel axle 5 prevents.

The fastening strap 16 of the protective bracket 15 closes a plate 17 with a recess 21 to the rear. The recessed plate 17 allows access to the wheel nut 6. The outside of the recessed plate 17 is essentially closed A straight bracket section 18 of the protective bracket 15 is directed towards the front and obliquely downwards. That straight strap section 18 is approximately parallel to the pivot arm 10 when this the chain leads on the one of the sprockets 7 with the largest diameter, which then assumes its highest pivot position. The switching mechanism 9 with the swivel arm 10 experiences the greatest deflection downwards when the chain 8 with that of the sprockets 7 is engaged, which has the smallest diameter. So that the protective bracket 15 also controls the switching mechanism 9 in this position shaded laterally outward, the straight bow section 18 is followed by a curvature 19 over which the protective bow 15 is bent backwards. This gives it a convex curvature towards the front in the direction of travel, which above all Avoids injuries in the event of a collision in the direction of travel. The free end 22 of the bracket 15 is pulled backwards so far, that it is in lateral projection towards the switching mechanism 9 this in the furthest downwardly pivoted end position still covered. It goes without saying that the bracket section 18, the curvature 19 and the bracket end 22 of the protective bracket 15 in a plane parallel to the respective parallel pivot planes of the switching mechanism 9 lies towards the outside.

The entire contactor bar 15 is expediently a one-piece B & u-

f I I I I

2138

October 9, 1981

part, which is not only suitable for the original equipment of bicycles with derailleur gears, but also for retrofitting is.

Claims (8)

PATENT LAWYERS ··· -. ' .:. * .. 'DIPL.- ING. BODO THIELKING TELEPHONE: (0521) 606 21+ 6 3313 DIPL-ING.OTTO ELBERTZHAGEN telex 9 ^ 059an «.td fKDSTSCHECK ACCOUNT: HAN 3O91 93-3O2 Ar-WALTSAKTE: 2138 date: 9 October 1981 Protection claims: 1. Bicycle with a derailleur / the one below Rear derailleur located on the side of the drive wheel to guide the chain parallel to the axis of the Sprockets have / characterized in that on the outside next to the switching mechanism (9) there is a fixed to the wheel frame (2, 3, 4) connected protective bracket (15) is arranged. 2e bicycle according to claim 1, characterized in that the Bracket (15) is arranged parallel to the axial direction of the drive wheel (1) approximately congruent with the switching mechanism (9). 3. Bicycle according to claim 2, characterized in that the flsß Switching mechanism (9) is arranged pivotably on the wheel frame (2, 3, 4) and the protective bracket (15) covers the pivoting range of the switching mechanism (9) covered. 4. Bicycle according to one of claims 1 to 3, characterized / that the protective bracket (15) extends down to approximately the height of the lower edge of the switching mechanism (9). 5. Bicycle according to claim 3 or 4, characterized in that the protective bar (15) has a curvature (19) lying in a plane parallel to the drive wheel (1) and which defines the pivoting range of the switching mechanism (9) covered. 6. Bicycle according to claim 5, characterized in that the convex side of the curvature (19) of the protective bracket (15) in Direction of travel is forward. - 2 - October 9, 1981 7. Bicycle according to one of claims 1 to 6, characterized in that that the protective bracket (15) has an integrally formed fastening tab (16) for fastening on the wheel axle (5) owns. 8. Bicycle according to claim 7, characterized in that on the fastening strap (16) an anti-twist device (20) is arranged.