DE2025708C - Chain gears for bicycles - Google Patents

Description

3 4

“Ears depending on the circumstances, or his tempo. 7 a, 7 b, 8 a. Sb. 9 a. 9 b, JOa and I ^ b are

Or micp.t the pedals more or less far back - schematic representations for the visualization.

Jcteii can. The cyclist only has to go through the successive phases of walking,

observe a minimum receding angle. An unaffected and the

• Most of the downshifts to the original 5 Figs. 11 and 12 are schematic

^{Gan ·· can by stepping} back too intensely according to ^Fi S-7bun A.

the "pedals also over several revolutions not delten embodiment of the hearing.

appear. Operating errors that lead to accidents The in Figs. 1, 2 and 3 dareesu

are therefore excluded. gige gearshift has a

In contrast to gear shifts of the well-known io, the rotatable on axis 3

. \ _r t «ground is stored in the circuit according to the invention. Fihmdrahmen

i S _n stepping back on the pedals a number of switching D * e axis itself is fixed with the ^ ™haben;

They only need to be set up in one preparatory stage, more precisely, two fixed rearwards

', on the basis of which the ar, du. Frame "

ärtstreten of pedals of e;! gent cozy switching _l5 strive to connect 1 ^"ldem ..F" // ^^^^ _au f-

nt. is felt through. In doing so, clamping nuts are used in the usual way for the axis

V,: ■ ··. . . ·· ₇

zi-Vktrcten the switching elements in a stable Laee The hub 4 is with a ^ « ^en . ^radl "£ ^r

* S cht so that an automatic, unexpected bandage, which in the example shown is zwt-i

Te, -if due Erschütteruneen when Fahrvor- 20 b carries wheels 6a and 6, the nchι durcn inn.

'. can no longer occur. 'distinguish at ™ ^ ^Γβ ' ^ρ . ^η . ^ "tj ^^ et _where -

^g ^ a preferred Ausfühiungsbeispiel the i "der Remen follow their Zahnezahlangeordna

F: dung, in which by stepping backwards the smallest sprocket is always on the Auixn

ρ> e first the relevant parts of the circuit side is located. . ",;" ,. "Hub neck

r., _n Shift to the desired gear in, 5 At the rear end of the rightmost nabc ^ a

[■ :. Stand-by should be thought of, it is ters 2. secured against rotation em to un en

ν ■, ill-fated. that the freewheel from a self protruding arm 5 anget.ra.ht, the at semem un

_d . Coupling pair driven alternately. End with a ^D * ^ ^fe " ^s * ₃ ™ ₈

f,: .-, - nd as well as a driven ring, down «« send pivotable trap arm β

υ · '.; - _{! U} r is rotatable in the forward direction. 30 carries. On a ^ ^lind "^ ^en ™" ^(l > _d e des

. ., _R certain applications it may be expedient between the lower supporting arm 8; _n ™.;. be the shifting of the chain immediately A.mesS and the upper hmk des ^ garm dV / h to perform the backward pedaling process. In is located ^ J ^^^ J ^ J ^ , rr, _t >, in such a case, the an- «st, the arm 8 around the pivot pin. . iicßende forward kicking the switching elements in 35 clockwise in FIG J ^to J ^ _ ^e "· _{d two} ,, -, ready position for the next aisle order a guide ^{1" "nd} * ^ne Vf ^he _{chain 12.}

.; hsel brought. It is useful that the chain wheels 6 "and 6b ^h ^ ^u \] ^ _T T _au ^ L · the F;,! On ⁸ from one himself via the coupling pair of the not ίgeig he ^ ^ ^te ^ ^ .J " _There ,, ..heldweise driven, driving as well as a pedal-carrying ^Tre ^ ^be ^ ¹ ^ J ™ ° _{% on a} ""driven ring exist", which is only used in the backward <o guide wheel Il dazo before Kute IZ

_{/ t} r Generation of axial movement as a function of tension loses. Seme storage we

the rotary motion a rotatable and gliding still b " ^c hn ^e ben_ _{according to p} .,

cen end cam with a ramp-shaped 45 Since the support arm 8 ^d " ^rc " ^α · ** \ .. _R " _{n through}

Ri i Uhnn load ^ : M w-rd d «^ JJJ

f iccn end cam with a ramp-shaped 45 ^{ua acr ird} ? ^rtll ', r'' _we d chain 12 through

Has cam surface that loads with the driving ring in the clockwise direction ^ : M w-rd d «^ JJJ

d., freewheel is taken and the Fu -gsrad 11 constantly umcrjp. 88 ,, ^

i.e., the freewheel is driven by the guide wheel 11 continuously under 8

f.., standing cam sensor interacts, and ten. Is it «J« »* ^hl - ^ ^s J ^ SST of the two

that the axial movement from the mechanism to change, d. h dit chain of a _lead .

there. Guide wheel through a Hülseneinhe.t over- ₅ o chain wheels 6 α and 6 t ^ on the «" * « _def

will wear, which consist of two nested ren, so wiro the guide wheel 11 in, en ν _Μ

Sn composed, the inner sleeve the direction »f Ä ^ ffSS

Freewheel carries and the outer sleeve the clutch bcnen details

T L Filf dd Mechanism for ^^^^

! ungear, the Frenauf_und_den_ mechanism for ^ * ™ £ ^ ™ £ ™ ^ "special.

F generation of axial movement takes up. 55 From the F. g. 3 h «6« i now c "" ^ ^ .. ·

, "The drawing are exemplary embodiments of the ordmmg ^ J ^^ S ^ eSeKNach Fig.

"^^ Broken side view of a Ϊ5 £ Α ^^ SCS

Bicycles with em. Appropriate gearshift ^^ S ^ SSS ^ S ^^^^

'"ÄS- - gears- ^ *» ™ - ^ £, ^ S

^m ¥ ili- ^l _z : Sr enlarged scale a Sif'bi.den .. ^ $ g2% g * $ ta VertilfalschnitT durch die in Fi _g .lund2- ^ ^ J ^^ l ^^^^^ * ^ the

. the

moves essentially from a sleeve 19 within a without rotating. Fig. 4 shows how the

offset sleeve 18, with which it is on the gc cam surface of the cam disk 42 of two con-

cignctc way, such as caulking, is connected. centric arches formed by a

This drive sleeve unit is connected by a compression rectilinear section. From the-

fcder 20 between the support arm 8 and the paragraph 5 cut 41 of the cam surface, which has a larger

the sleeve 18 is constantly pressed to the left. Having on the diameter serves to either the

left, further part of the stepped sleeve 18 is claw 37 or the claw 38 out of engagement with the

by means of a screw 23 firmly to attach a ring 21 to the contact surface 29 or 30 concerned,

brought, of which a collar 22 in a corresponding When the claw 37 through the section 41 of

annular recess of the 'power transmission io cam surface out of engagement with the contact surface 29

glicdes 14 intervenes. In this way, the is brought, the claw 38 is able to with the

Drive sleeve connector and the chain guide unit contact surface 30 to come into contact, as shown in FIG

move axially together on the axis 17. indicates. When the force transmission member 14 and the

Inside the sleeve 19 there is a cam pawl 38 that is at least 180 degrees counterclockwise

26, which is attached to her with a pin 28. 15 have rotated clockwise according to FIG. 4, the

that the cam surface is forced on a roller 27 on a claw 38 by the cam disk 42,

outwardly pointing pin on the axle 17 to leave the contact surface 30 while the claw

which acts as a cam sensor. When turning clockwise forwards, 37 can move with the

the cam 26 is able to come into engagement with respect to the roller of the Nockcnfüh- contact surface 29. Iers27 axially rotated during its rotational movement. From the preceding it follows that the

push. In this way, the cams 26, claws 37 and 38 act with the contact surface 29b ™ 30

and the roller 27 together in such a way that they in under the influence of the cam disk 42 so / 1

Depending on a rotary movement, they are able to work together axially, so that they have a coupling

generate movement that form the chain guide, which has a limited forward and RmV

communicates. The cam shape is based on FIG. 6 forward movement of the ring 32 allows. This clutch

before. after which the cam surface has a ramp 24, one downstream of the previously mentioned freewheel. Latching recess 25 and an intermediate gcrad- .within the groove 44 in the axis 17 bcnndii

has linigcn section. a stop 45 (Fig. 3), whose Axialbcw «.

As best from FIGS. 3, 4, 5, 7a, 7b. by a screw46 with washer.

8a. 8b. 9a, 9h. 10a and lob, the 30 is limited to the cam disk42 at a / ·

Sleeve! 9 Jotc * οη a "freewheel" mgsber ·., To prevent the extensive axial movement to the left

two rings 32 and 35 with claws 31 and 33 respectively. The stop 45 is arranged so that. in the case

stands. Between the right-hand inner end of the shoulder 43 of the cam plate against him.

Sleeve 18 and the driven ring 35 is the sleeve unit and the chain guide unit

a coil spring 36. which holds the claws 33 35 in the position N corresponding to the small gear.

normally in engagement with the claws 31. Find. In addition, a finger 47 (Figs. 2 and 31

In this way, it is ensured that the Angelrie- with a press fit on the narrower portion of the sleeve IH

bcne ring 35 a forward rotation (clockwise - between the shoulder of the sleeve and the compression spring

meaning according to Fig. 1) can only be experienced when 20 put on. The finger47 moves upwards where it is

the driving ring 32 of FIG. 4 is cranked in a clockwise 40 Z-shape, so that its topmost Ab

sense is driven. section of the outer or, according to Fig. 2, right side

The driving ring 32 is also opposite to the drive chain 12, which is provided with a recess that has two chain wheels 6 α and 6 fr that come into operation when the guide wheel 11 and the respective backward rotation of the ring are in operation. In this way ver has contact surfaces 29 and 30, while the ring 35 driven by the finger 47 to displace the chain 12 has a groove 34 which connects the outer of the large chain wheel 6fr to the smaller end of the through the sleeve 19 to contribute through sprocket6β. As shown in Fig. 3 to erStiftes 28 takes up. see, the finger 47 is through a stud 48

The force transmission member 14 carries two claws in the support arm 8, which sieve through dt> i fingers 47 37 and 38 extends therethrough for forward and backward rotation, respectively, of the 5 ", prevented from rotating driving ring 32 which is connected to it by a stud 48 from a coil spring 49 common pin 39 are pivotally connected. surrounded to the finger 47 against [ede by the These claws are to be protected by a spring 40 in an un-chain shock load exerted on them, opposite directions loaded, so that their As already said, the gearshift tips shown are independent of each other with the two SS device in the F ig. Ibis 7 ία their position for the Contact surfaces 29 and 30 come into contact, each small gear shown. Pray drive in this one after a forward or reverse rotation of the gear, the roue of the cam sensor 27 is with the Ring 32. That is, the pawl 37 occurs at the forward-outermost part of the ramp 24 of the cam 26 in or clockwise rotation according to FIG. 4 in radio contact, so that the chain 12 which runs away over the guide wheel 11 while the claw 38 is displaced to the left when it is rotated in the opposite direction, where it Clockwise takes effect. engages with the larger sprocket 6 a

As best seen in Fig. 3 is located on the. A cam disk 42 is placed on axis 17, which is set to In operation, starting from the position of the

its inside carries a shoulder 43, which loosely in individual parts according to the small passage after the

one running longitudinally: Not44 in the counter-rotation Fig. 1 to 7, a rotary movement of the guide wheel

secured axis 17 engages. In this way, 11 can work in a forward direction on the power transmission

the cam disk 42 along the groove 44 in the member 14 and from there to the Klanen 37 and 3β Qber-

gkkhea slide in the direction in which the sleeve 19 sit. Since the clans 37 seldom move forward

moderately

Fuh-

Switching device for the circuit

"J 5"

Si

M 3- ^ are

Ring 31. den 4 * «

Kraftübggg the claw in low gear

Oh"

Radfaha-r a ROck.änsirchung

she

Sr din next to the guide wheel

^^ circuit in the small corridor, in "£ * Λ *; _embodiment

for

sstellunS for ^ "dTIadfahrer an- Ganges according to ng- - ^ ¹ - the chain angre,«.

The switching device according to the invention can just as well be used on a derailleur system with several chain wheels on the pedal crankshaft. If the gearshift in this case is of the kind in which the gear change takes place by forward rotation of the guide wheel after the relevant parts have assumed their ready position by pedaling backwards, the guide wheel is preferably attached in a sqlchen position in which it is attached to the upper one Attacking strand of the chain near the sprockets.

10

On the other hand, if the gear change, as in the last example described, immediately at If you step backwards, the guide wheel should be on the lower chain strand, again close to it the sprockets, attack.

As can be seen from the preceding description, the circuit according to the invention is extraordinary simple and compact design, with additional parts such as a cable, a gear lever

»O and the like can be avoided because the switching process occurs or is triggered by stepping backwards.

1 sheet of drawings

Claims (4)

ι 2 cams equipped mechanism for generating claims: an axial movement caused as a function of a rotary movement and the Gangwechseliil 1. Chain gear shift for bicycles, triggered by stepping backwards. which for the Ganowecr-sel the drive chain 5 gearshifts of this type are known. From one chain wheel to another chain wheel you have the advantage that the gear change is no longer possible with a different number of teeth by transverse shifting, as is the case with conventional chain gear shifts, by a type known with a cam by manual actuation of a mechanism for generating caused by a lever, but only triggered by an axial movement depending on a rotary io backward pedaling,
movement caused and the gear change! A gear shift of this type, in which by stepping backwards briefly, and then stepping backwards on the pedals, the gear change is characterized by the fact that between takes place, is known, for example, from the British patent publication 645 791 driven by the chain (12). With a gearshift transmission member (14) and the cam (26) de: 15 mechanism equipped according to the English patent specification one behind the other a freewheel (32, bicycles have the advantage that the cyclist 35) and a pair of clutches (29, 37, 30, 38) for when switching while pedaling the handlebars do not have to let go of a forward or backward transmission and the arrangements of cable rotation of the power transmission member (14) on trains, transmission members and shift levers are arranged fully down the path (32, 35), with 20 coming omitted . However, such gear shifts have the disadvantage, after reversing or forward rotation, that the cyclist only has a certain amount of pedals when changing the force transmission member (14) via an upstream, for example, from a low to a given minimum angle -Switch position for power transmission located th angle is allowed to step backwards, so that the gear with each other coupled parts (32, 29, 37, 30, 25 change takes place. If the cyclist exceeds at 38). In a preparatory position for stepping out and backwards this angle, i.e. if you release the gear change and step too far backwards after the forward pedals, the or reverse rotation of the power transmission required switching process for the gear change g! iedes (14) takes place in the other Switch position for not. In other words: it will be possible to bring power transmission to the cyclist. 30 fail to shift into a higher gear, 2. Gear shift according to claim 1, characterized when he is unable to a certain characterized in that egg freewheel (32, 35) must be adhered to from a step back angle. one even via the clutch pair (29, 37; 30, with such gear shifts there is no 38) alternately put on, driving the danger that due to the (32) as well as a driven ring (35) 35 occurring vibrations an automatic gear is, which can only be rotated in the forward direction. change takes place without the cyclist 3. Gear shift according to claim 1, thereby intentional. Such a switch to the characterized in that the freewheel (32 ', 35'), from which the cyclist is not prepared, can be in a bad way even over the coupling pair (29 ', 37; frequent cases even lead to accidents, since the 30 '. 38) alternately driven, driving 40 cyclists due to the sudden unexpected change (32) as well as a driven ring ^ (35 ') change the force relationships on the pedals easily exists, which can only be rotated in the reverse direction. Lose balance and step off the pedals 4. Gear shift according to claim 2 or 3. can slip and fall. characterized in that the mechanism object of the invention is also opposite Completely insensitive to the generation of the axial movement depending on extreme vibrations from the rotary motion to a rotatable and exposed gearshift for bicycles Conductive cams (26) with a ramp-like shape in which there is no need for a gear change gene has cam surface (24), which is necessary with the. a certain step back angle The driving ring (e.g. 32) of the freewheel must also be observed. is taken and with a fixed 50. This is achieved according to the invention in that Cam sensor (27) cooperates, and that between a force-axial movement driven by the chain from the mechanism to the transmission link and the cam of the mechanism guide wheel (11) By means of a sleeve unit one behind the other, a freewheel and a clutch support are created, which are made up of two nested pairs for the transmission of a forward and backward sleeve (18,19), the inner 55 rotation of the power transmission member on the Sleeve (19) carries the freewheel and the outer freewheel are arranged, with reverse sleeve (18) the coupling pair (e.g. 29,37; 30, or forward rotation of the power transmission link 38), the freewheel and the mechanism to move over a predetermined minimum angle which is in Generation of axial movement takes up. the one position for power transmission 60 sensitive interconnected parts in one preparatory! »division to trigger the gear change and after forward or backward rotation of the power transmission member in the other The invention relates to a chain gear switching position for power transmission can be brought, I circuit for bicycles, in which for the gear 65 Due to the features according to the invention is a change the drive chain from a sprocket to gear shifting created by the cyclist : in another sprocket with different teeth - to initiate the gear change, for example from : ahl by shifting sideways through a with a low to a higher gear or by ·