DE3308205A1 - Gear-change system for a bicycle - Google Patents

Description

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G η η rr circuit for an F -your bike

The invention relates to a gear shift for - a bicycle and relates in particular to a bicycle gearshift with a Rasteinrichtunp; to hold the gearshift in the individual gears.

A known bicycle gearshift usually has one

rotatable on a standing upright on a bracket; fixed shaft journal mounted shift lever and a between this and a fixed part, jr e.g. the locking device arranged for the mounting bracket Holding the gear shift in the individual gears.

The Rasteinrichtunp: has a on the shift lever or on the fixed part arranged locking member approximately in the form

2Q one by a spring towards the other Part loaded locking ball and a locking part arranged on the respective other part. The detent part has a Number of wells with which the locking member in the different switching positions of the shift lever can be brought into engagement to bring it into the respective shift position to hold on.

As the number of gears that can be shifted by means of the gearshift increases, the number of gears also increases accordingly Number of rim wells, so the distances reduce accordingly between the individual indentations. When skipping the loaded by a spring Rastfrlieds from one depression to the next 'can it can happen that those defining the distances break out narrow webs so that the Gangpohal + "unr thin is no longer properly locked in the individual gears.

To prevent this danger,> - mi example] Pweice der mit

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'Learn box part provided retaining fitting larger dimensions F.nnr-'yn , so that the individual grate depressions rjüv.'it then an enlargement of the distances between the locking depressions allowed _o

This then, however, has the disadvantage that the entire arrangement assigned to the shift lever is given larger dimensions.

Well-known in view of the limited deficiencies and disadvantages Arrangements, the invention creates a bicycle gear shift of the type mentioned, in which the in a detent part shaped and intended for the engagement of a locking member locking recesses in larger mutual Distances are arranged without increasing the overall dimensions of the arrangement, and which Thanks to the increased strength of the webs separating the locking depressions achieved in this way, an improved Has durability «

The invention is characterized in that between a rotatably mounted on a shaft journal Shift lever \ md a fixed part a locking device is arranged, which several locking members and a detent portion having a number of detent recesses with which the detent members selectively engage

are bringable.
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In a preferred embodiment of the invention are a first and a second locking member in substantially symmetrical positions with respect to the shaft journal arranged. There are also a first latching part assigned to the first latching member and a second latching member associated second locking part with respect to each other and arranged on the two locking members so that each only one locking element with a locking recess of the associated

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η et C "- remainder i 1 r, in engagement rtoh ^ n can while see the other R ^ trl i ed Ln:; w is ^ hen out of engagement is located. Others just.pressed,] nrren rieh dn.o first and the second Kostrlied alternates with a recess of the first or the two-tone "detent part in engagement bring to the speed tu η ρ; in the respective switch position to hold on.

In the case of a gearshift with, for example, six gears, the first I? As? Tgl ie-.i holds the gearshift, for example, in the numbered gears, ie in the first, third and fifth gear, during the second locking member. then the gear shift in the even numbering ^+: .festhält en passages, ie, in the second, fourth and sixth gear.

In an arrangement of the type indicated above, the first detent part assigned to the first detent part then has three detent recesses which are arranged at the points corresponding to the first, third and fifth gnnr. The second Jiastgl ied associated second JRactenteil also has three Jiastvertiefungen, Weici weiton ¹ G to the r /, fourth and sixth gears corresponding points are arranged. The detent recesses of the orsten and the second detent part are arranged in v.'t-sentlichrn sjr.rnetri sch in relation to the Y / ellens & pfen carrying the shift lever.

The arrangement described above makes it possible to design the distances sv.'iscnon all on adjacent latching depressions double-It ro large j-.u v'ie the path of a latching member from one position to the next. I'ic-Fe VcrgröficruTig the distances between the ein-irner bonnchbarton L'-ntver'ti efungen is not indicated by a vF-xg: · ^] .'- ι > iuf ή r: Kv Jini .ab:.; Land. · ", Zwi Hcli'-n <U'H U-cr \. ~ Recesses and d ^ m V ^.! > -! 1 c-n7.hr> ϊοώ bought, π ο d" ^f1 di <· . saved device ¹ : i'T ^ifit ? ^ '^ rb blinh vcrbenr.ertor use: eiger.sehrfton koln'- νν +' κ · -τ °: y'v.vwwy ^"f.-rri?!. 3l L.

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The following is a preferred embodiment Invention explained with reference to the drawing. It zcircn:

1 shows a schematic oblique view of the actuating part a bicycle gearshift in one embodiment of the invention,

Fig. 2 is an axial sectional view of the embodiment ^ form

according to Fig. 1 and
10

3 shows an oblique view of a part belonging to a latching device.

In Fig. 1 and 2 you can see a clamp 1, which is tightened by means of a fastening element 1a around a frame part A, for example around an upper one Frame tube, a frame strut, a handlebar head or the handlebar of a bicycle. The clamp 1 has a non-circular cross-section having elevation 1b, on which a tubular, an internal thread having shaft journal 2 protrudes radially.

A fastening part 3 placed on the elevation 1b so that it cannot rotate relative to the clamp 1 has a, Bottom plate 3a and one at one end thereof in parallel to the shaft journal 2 angled holding arm 3b.

A detent disk placed on the shaft journal 2 and resting on the base plate 3a of the fastening part 3 4 is with an end piece in engagement with a bore 3c of the holding arm 3b, so that they are relatively is held non-rotatably to the fastening part 3.

A shift lever 5 is de-sselhen with a hub part 51 penetrating fitting bore rotatable on the shaft journal 2 placed so that the underside of the hub part f> 1 is in contact with the detent disc A-, and is under between! are of a washer ("■■ through

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one-. Cover 7 held.

The corner 7 has one on one side in Kingriff with the Holding arm 3c standing extension and int mean one screwed into the threaded hole of the shaft journal Screw 8 is held on this so that the gear lever 5 with its IJabteil 51 between the cover 7 and the detent disk 4 rotatable on the shaft journal P. is stored.

The invention is particularly directed to an intermediate the shift lever 5 and the fixed parts, namely the fastening part 3 and the Hastenschei.be 4 arranged Rasteinrichtimg 9 for holding the Schalthebeis 5 in the corresponding Gänpcen Switch positions.

A first and a second belong to the locking device Q Pasting member 10 or 11 and a first and a second locking part 12 and 13, each with a number of locking depressions, with which the first and the second latching member 10 and 11 can be brought into engagement optionally. That first and. the second locking member 10 and 11 are arranged essentially symmetrically with respect to the shaft journal 2, while the first and second detent parts 12 and 13 are so arranged with respect to the two detent members are that beirr. For example, engagement of the first latching member 10 with a recess in the first latching part 12 the second detent part 13 is rotated with respect to the second detent member 11 in such a way that it has no recess of the second locking part 13 comes into engagement.

As can be seen in Fig. 2, the first and the second locking member 10 are bnw. 11 in the form of locking balls ^ ⁵ and in d ^ s Nabentc-iü ^C > 1 of the shift lever ^r > ^ ingrr-.ft.: * +, While the first and the second i? Asteni.ei ι "Vc rj-. w. I ■ *> on the locking disc 4 go ferrit; are. D mc Iiabexitei j VI des ochalthebo] s; ^r 5 hnt an - · "··: i> nr Λ * τ Rnstenncheibe ⁷ I zu-

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innton God te two in relation to the shaft journal 2 ^ ymn.ctrisch arranged bores 52. and 53, in which , jüv.'uilc oino version 14 or 15 for the respective.-P.astl'uncl 10 or 11 is slidably guided. One through. the two holes 52 and 5? ring groove running through it 54 is used to accommodate a compression spring 16, which the two locking balls 10 and 11 over their sockets or 15 loaded in the direction of the detent disk 4.

The first and second detent parts 12 and 13 have the shape shown in FIG. 3.

They are designed for a gear shift with six gears and. accordingly each have three locking depressions 12a, 12b, 12c or 13a, 13b, 13c, which in the locking members 10 and 11 are complementary positions are arranged around the shaft journal 2. The locking depressions 12a, 12b, 12c of the first detent part 12 are in the first, third and fifth gear of the Six-speed gear corresponding positions I, III and V arranged, while the locking recesses 13a, 13b, 13c of the second detent part 13 in the second, fourth and sixth gear corresponding positions II, IV and VI

are arranged.
25th

The locking depressions 12a, 12b, 12c of the first locking part 12 and the locking depressions 13a, 13b, 13c of the second Detent part 13 are not arranged symmetrically with respect to the shaft journal 2, i.e. the detent recesses 13a, 13b and 13c are circumferentially from a position which is symmetrical with respect to the locking recesses 12a, 12b and 12c shifted direction. Therefore, the first and second locking members 10 and 11 alternately engage with each other a locking recess of the first or the second locking part 1? or 13 to shift gears to the six To hold positions corresponding to corridors i

When actuating the shift lever 5 to switch between

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for example, from second to third gear this occurs until then in engagement with the rim recess 13a of the second latching part 15 protruding second latching member 11 from this and is supported on the space between the depressions 15a and 15b filling Area from, while the until then on the area between the haste depressions 1? A and 12b of the first Detent part 12 supporting first detent member 10 comes into engagement with the detent recess 12b and the gear shift then holds in position III corresponding to third gear.

When you then shift into fourth gear, the first locking member 10 is then released from the locking recess 12b of the first detent part 12 lifted out in order to be supported on the surface between the detent recesses 12b and 12c, while that until then has been on the area between the locking recesses 15a and 15b of the second locking part 15 supporting second locking member 11 comes into engagement with the locking recess 15b to the gear shift in the hold position IY corresponding to fourth gear.

So there is no matter which aisle is switched, only one of the locking members 10 or 11 in engagement with a locking recess of the each associated locking part 12 or 15, while the other locking member 11 or 10 is out of engagement with the locking depressions assigned to it. In other words, the two locking members 10 and 11 come alternately in engagement with the depressions of the detent parts 12 and 15 assigned to them.

As a result, the distances between adjacent eastward presentations can be twice as large as the ;;! The angle of rotation of the tendon from one connection to the next corresponds. This enlargement of the distances between the locking depressions is not due to a corresponding increase in the radius: 'j -: ■ ' position between the locking

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Wells and the V / ellenzapfen 2 bought, so that the switching device has a greater strength, without "inP rip therefore has larger dimensions. As a result, that the locking members 10 and 11 in their engagement with the locking recesses as well as during their movement of a Deepening to the next over the area stretching in between under a considerable load stand by the spring 16, the shift lever 5 has a sufficient actuation resistance. The described device a considerable strength even with reduced wall thickness of the individual parts have, so that a safe actuation of the gear shift by means of the shift lever 5 is guaranteed over a long period of time is.

In a modified embodiment, the latching members can also be designed as rollers and the first and second detent parts can be provided with blind bores. It all that matters is that the locking members 10 and 11 securely engage in their movement in the circumferential direction with the locking parts 12 and 13 can be brought.

Further, it is axich possible to arrange the locking members 10 and 11 on the fastening part 3, this being connected and then formed the detent parts 12 and 13 on the shift lever ^r> or otherwise mi.t.

Furthermore, the invention is also applicable to a four-speed shift or a gear shift of an even larger number of courses applicable, in which case, each detent tail 12, 13 zv / ei snap-in recesses or a larger number of recesses may have.

In addition, the fastening part 3 can also be made in one piece the clamp 1 be formed.

As can be seen from the above description, the locking device 9 of the gear shift according to the invention belong to

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a first and a second: - ". Kni-tgl 3 ed 10 or 11 as well a first and a second ?; Raster part 1? or 12 with for the engagement of the R-istglieder 10 and 11, respectively Locking recesses, woboi the locking members 10 and 11 in bezuß: on the shaft journal carrying the gearshift lever substantially symmetrical and the first and second latching parts 12 and 13 with respect to the latching members 1o or 11 are arranged such that in each switching position determined by the shift lever 5 one of the Latching members 10 or 11 are in engagement with a latching recess of the associated latching part 12 or 1J, while the other RastgDied 11 or 10 except Engagement with the recesses of the notches assigned to it is part 13 and 12, so that the shift lever 5 is safe is held in the respective switching position, the distances between adjacent locking depressions even with a larger number of gears or shift positions can be relatively large, whereby the areas extending between adjacent detent recesses are given greater strength and secure actuation and locking of the shift lever is guaranteed over a long period of time.

The invention is not based on the exemplary embodiment described above and shown in the drawing limited, but allows various modifications of the same within the scope of the claims.

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Claims (4)

MOUNTAIN: SJfÄPF. : SWATH ;. ^ ANDMAIR MAUEHKIRCHi: HSTRASSE from BOOO MUNCHtN HO Lawyer record ?? F7O March 8, 1983 Gear shift for a bicycle 1 J gear shift for a bicycle, with a twisting r on a shaft journal mounted upright on a fastening part Rela ^ erten shift lever and a locking device arranged between the shift lever and a part that is stationary relative to this part; to hold the gearshift in the individual shift positions, thereby Rekenri draws that?: ß the Rasteinrichtunp (O) a first and a second locking member (10 or 11), a first? Rastteil (1?) Ri t πΊντ Pr.-nhl from Rastverticfunron (1- \ 3 to 1? C) for eggs: .ünrri \ 'ϊ ricü first HnEtr ^' odr ⁿ ; rr1 rin second rarity. ·:>"- τ \ '<· - ! ^Ί (I"') ι: i 'of a number of deepenings (15s bin Λ' ^Α <-.) For r'en engagement of the second ratchet shows that the first BATH ORIGINAL • <069) 988272-74 Telex: 524 560 BERG ä Bank accounts Bayer. Vereinsbank Munich 453100 (BLZ 70020270) Teteßism ™ (cable). Telekopiefen (089) 983049 Hypo-Bank Munich 4410122850 (BLZ 70020011) Swifl Code: HYPO DE M BEfKaSTAPFPATFNT Munich KaIIe Inlntpr B35O Gr Ii + 111 PoiUchet * Munich 653 43-BOS (BLZ 70Q100 80) and the second latching member with respect to the shaft journal (?) which separates the shift lever C ^) essentially r: νfnrnf-it.ri rc h are arranged \: nd d .-> ß the first and the second box part are arranged such that the latching recesses of one latching part are offset in relation to those of the other latching part around the shaft journal, so that when the first or second latching member engages with a latching recess of the first or second latching part, the other latching member is disengaged from the latching recesses of the respective other detent part and that the first and the second detent member can be brought into engagement alternately with a detent recess of the first and the second detent part in order to hold the gear shift in the respective shift position. 2. Gear shift for a bicycle according to claim 1, characterized in that the latching device (9) has a non-movably connected to the fastening part (1, 3) detent disc ( ¹ V) on which the first and second detent parts (12 or 13) are arranged. 3. Gear shift according to claim 1 or 2, characterized in that the locking depressions (12a to 12c, 13a to 13c) of the first and the second east part (12 and 13) along one with the shaft journal (?) are arranged concentric circular line, with all locking depressions of the second locking part in are not arranged symmetrically with respect to the shaft journal. 4. Gear shift for a bicycle according to at least one of claims 1 to 3, characterized in that the distances between adjacent detent recesses (12a to 12c, 13a to 13c) of the first and the second Most of the time (12 or 13) are twice as large as that Angle of rotation of the switching lever (B) between two switching positions is equivalent to. SAD ORIGINAL