DE202009015815U1 - Device for tensioning a toothed belt or a drive chain and frame for a bicycle - Google Patents

Abstract

Dropout (1) for a rear frame structure (12) of a bicycle frame (10) with a base part (2) for operative connection with tubes (13, 14) of the frame frame (12) and a carriage (3) attached to it with a holding device (4) Receiving an axle, characterized in that the carriage (3) has at least one elongated hole (5) which serves for receiving at least one fastening screw (6) and a nut (18), so that the carriage (3) is released when the fastening screw is loosened ( 6) relative to the base part (2) in a longitudinal direction (x) is displaceable.

Description

The The invention relates to a device for tensioning a toothed belt or a drive chain and a bicycle frame for receiving such a device.

since For a long time, toothed belt drives and hub gears are back popular as it lacks chain drives Maintenance required and the risk of contamination lower is. These drives are equipped with advanced hub gears, Disc brakes or Rollerbrakes combined installed.

From the prior art, a number of frame structures and dropouts for bicycles are known. On the Internet is an overview of various dropouts for chain drives under http://de.wikipedia.org/wiki/Ausfallende ,

US2008194364 was published in 2008 and shows a device for tensioning a chain or a toothed belt drive, which can be inserted from behind into a slot-shaped yoke of a dropout. The device is suitable for. B. not for the installation of disc brakes. It is also not clear how and where the frame for mounting a toothed belt should be shared.

JP2008044527 was also published in 2008 and discloses a device for tensioning a toothed belt. The device comprises two spring-loaded arms with rollers which press against the drive belt and thereby tension it.

Examples of devices for tensioning a drive chain or a drive belt are further known US5888159 . US4099737A (1978) FR1040856 (1951), US2475806 (1946) US1995794 (1934), GB272683A (1927), DE435560A (1925), GB189904113 (1899), GB189719434 (1898).

Civia Cycles offers a frame called "Hyland" via the Internet (cf. http://www.civiacycles.com/civiaframeset_hyland.php ), the rear of which has slits movably arranged dropouts, by means of which the drive chain can be tensioned. However, the frame is not divisible in the region of the rear end, so that the chain must be separated for assembly.

A The object of the invention is therefore an improved dropout for a bicycle and a frame to accommodate such a dropout to show which the known from the prior art disadvantages do not have.

The Dropouts according to the invention differ on the left and right and each consist of one with the frame tubes operatively connected Base part and one in a longitudinal direction or an angle sliding carriage for this purpose. The carriage has a fork or yoke-shaped end, which is for receiving an axle a wheel serves. The sledges are usually opposite the base part arranged inside. Depending on the field of application exists also the possibility to arrange the slides outside, which, however, results in an enlargement of the axis. The base part is usually glued to the frame tubes, welded or screwed. At least on the drive side, it can be on or be made divisible several places, so that a chain or a timing belt can be easily mounted. The division is done preferably by loosening a screw or a bolt. Due to the elasticity of the frame tubes, the frame can then be pressed apart slightly so that the chain or the timing belt easily inserted into the triangle of the rear triangle can be. If necessary, certain joints be designed as joints, so this with a sprung rear triangle to balance the movement.

It Several separation points can be provided, so that the base part replaced, or replaced by another can be. In a preferred variant, the base part is after arched at the back and can be curved Connecting means (eg eyelets or holes) for have an apron and / or a luggage carrier.

In In one embodiment, the carriages are longitudinal extending slots, which accommodate the mounting screws are suitable by means of which the carriage relative to the Base parts can be fixed. When solved Mounting screws can slide against the Base parts are shifted in a defined amount. To forces longitudinally absorb the dropouts with the base parts additionally via a set screw coupled. When loosening screws can the dropouts by the screws in the longitudinal direction accurately positioned, respectively, the chain or the timing belt controlled taut become.

The According to the invention dropouts and bases are so designed that they are weight optimized and yet one have robust construction. Good results are achieved by castings made of aluminum, magnesium or steel.

An embodiment of the invention relates to a dropout for a frame rear construction of a bicycle frame with a base part for operative connection with tubes of the frame base. A Schlit th with a holding device (fork / yoke / socket) for receiving an axle is attached to the base part. The carriage has at least one elongated hole which serves to receive at least one fastening screw and a nut, so that the carriage is displaceable in a longitudinal direction when the fastening screw is released relative to the base part. If necessary, the carriage is operatively connected via an adjusting screw with the base part, which serves for adjusting the position of the carriage relative to the base part. The nut can be designed so that they engage from the inside in the contour of the slots. A carriage may have an adapter for a caliper of a disc brake. A slide may alternatively or additionally have a torque support. The carriages are advantageously arranged within the base parts with respect to the frame's rear construction.

The Invention will be shown with reference to the figures shown in the following figures Embodiments explained in more detail. It demonstrate:

1 a first bicycle frame with a dropout according to the invention;

2 a second bicycle frame with a dropout according to the invention;

3 an embodiment of the dropouts in a side view;

4 the dropouts according to 3 in a rear view;

5 the dropouts according to 3 in a view from the top right;

6 the dropouts according to 3 in a view from the top left;

7 another embodiment of the dropouts in a top right view;

8th the embodiment according to 7 in a view from the top left.

Yourself corresponding parts and areas are - unless otherwise stated is noted - in all figures with identical reference numerals Mistake.

1 shows a first bicycle frame 10 made of steel and 2 a second bicycle frame 10 made of aluminum with inventive dropouts 1 , If required, the bicycle frames can also be made of carbon or other material. The bicycle frame 10 have a front frame triangle formed by tubes 11 and a triangle consisting of two triangles 12 on, passing through upper and lower tubes 13 . 14 is formed. The dropouts 1 are z. B. by welding or bonding with the pipes 13 . 14 operatively connected.

3 shows an enlarged view of the inventive dropouts 1 of the frame 10 according to 1 (Steel variant) in a side view. 4 shows the same dropouts in a rear view. 5 shows the dropouts 1 from diagonally right above and 6 from diagonally left above. The 7 and 8th show the aluminum variant of the frame according to 2 , In the 5 to 8th are only part of the pipes 13 . 14 of the respective frame 10 to recognize.

The left and the right dropout 1 are configured differently in the embodiment shown and each consist of a base part 2 with the upper and lower tubes 13 . 14 of the rear triangle 12 is connected (see. 4 to 6 ). At the base parts 2 are sleds lying inside 3 fastened to a holding device (fork / yoke / bushing) 4 for receiving an axle of a wheel (both not shown). In the illustrated embodiments, the opening is the fork 4 aligned downwards (-z-direction). Other angles are possible. The sledges 3 are arranged parallel to each other.

The sledges 3 have slot-shaped openings, resp. slots 5 in which there are two fixing screws 6 are arranged by means of which the carriage 3 at the base parts 2 are attached. In the embodiments shown, the fastening screws 6 arranged in a plane. If necessary, more than two fixing screws 6 are provided, which are arranged offset from each other. On the inside are in the slot-shaped openings 5 appropriately trained contour adapted mother 18 arranged with the fixing screws 6 interact. The mother 18 are designed so that they with a certain positive fit in the cross section of the slot-shaped opening 5 engage and secured against unwanted twisting. As a rule, the mother 18 made of steel or another high-strength material. In contrast to the prior art, the slides can thus be made of a lighter material. The fork 4 is designed so that the axis of the wheel in the assembled state is approximately at the height of the fastening screws. As a result, a good distribution of forces and torque absorption is achieved. The slot-shaped openings 5 allow you to move the slides 3 opposite the base parts 2 with loose fixing screws 6 in a longitudinal direction (here x-direction). The sledges 3 are in the embodiment shown with the base parts 2 additionally via adjusting screws 7 operatively connected. These serve to absorb forces in the longitudinal direction and / or for tensioning the drive means (chain or toothed belt) with loose fastening screws 6 and mother 18 , They can also be used for exact positioning and alignment of a wheel. The screws have in the illustrated embodiment, a connection for an Allen key. Other connections for tools are possible. The dropout on the right side 1 has a separation point 8th on which the rear triangle 12 , z. B. for mounting a chain or a toothed belt, can be separated. The sled 3 the dropout on the left side 1 has an adapter 9 for mounting a commercially available disc brake (not shown) on. The adapter 9 used for mounting brake calipers of disc brakes z. B. after ISO 2000 standard or designed as a postmount version for 180 mm disc brakes

How best in the 4 to 6 it can be seen, the sled points 3 an upwardly projecting eye 16 in which the set screw 7 is screwed in the longitudinal direction. At the base part 2 is an inwardly projecting pin 17 arranged as an abutment for the set screw 7 serves. If necessary, the pin can 17 the base part 2 be molded or operatively connected with this as a separate part. On the left side is the set screw 7 in the base of the brake disc adapter 9 anchored. The adjusting screw 7 has two opposite threads, which are screwed into corresponding mating thread. This makes a simple installation possible. Other forms of screws with z. B. only one thread are possible.

In principle, those for adjusting the slide 3 required slots 5 also be mounted on the frame side, however, this may lead to a poorer load distribution of the highly stressed rear triangle 12 , Also, in case of a defect or for other purposes optimized sliders 3 simply be exchanged. How best by 4 can be seen, is the brake disc adapter 9 opposite to the sled 3 arranged in an S-shaped offset inwards.

The basic parts 2 can in the connection areas for the pipes 13 . 14 have at both ends projecting, here inwardly offset switches, on which the tubes 13 . 14 can be plugged. The length of the switch is designed to provide a good weld or adhesive bond between the base parts 2 and the pipes 13 . 14 becomes possible (eg 0.5 to 2 pipe diameters). In another embodiment, the joint is formed blunt. Mixed forms are possible.

The fixing screws 6 may have a protruding length or be provided with an internal thread, which allow the mounting of a bicycle stand. The basic parts 2 and / or the sledges 3 can with attachment means, for. B. in the form of eyelets or holes 19 equipped for mounting a mudguard or luggage carrier.

In the embodiment shown, the eyelet for the torque arm 15 designed as a separate component that can be screwed. If required, the torque arm can also be integrated.

1

dropouts

2

base

3

carriage

4

holder (Yoke / fork / eye)

5

Openings / slots

6

mounting screws

7

screws

8th

separation point

9

adapter

10

bicycle frame

11

front frame triangle

12

rear

13

upper Tube

14

lower Tube

15

eyelet for torque support

16

eye

17

spigot

18

mother

19

fastener

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• US 2008194364 [0004]
• - JP 2008044527 [0005]
• US 5888159 [0006]
• US 4099737A [0006]
• - FR 1040856 [0006]
• - US 2475806 [0006]
• - US 1995794 [0006]
• GB 272683 A [0006]
• - DE 435560 A [0006]
• - GB 189904113 [0006]
• - GB 189719434 [0006]

Cited non-patent literature

• - http://en.wikipedia.org/wiki/Faulty [0003]
• - http://www.civiacycles.com/civiaframeset_hyland.php [0007]
• - ISO 2000 standard [0027]

Claims (8)

Dropouts ( 1 ) for a frame rear structure ( 12 ) of a bicycle frame ( 10 ) with a base part ( 2 ) for operative connection with pipes ( 13 . 14 ) of the framework ( 12 ) and a carriage attached thereto ( 3 ) with a holding device ( 4 ) for receiving an axle, characterized in that the carriage ( 3 ) at least one slot ( 5 ), which is for receiving at least one fastening screw ( 6 ) and a mother ( 18 ), so that the carriage ( 3 ) with the fixing screw ( 6 ) relative to the base part ( 2 ) is displaceable in a longitudinal direction (x). Dropouts ( 1 ) according to protection claim 1, characterized in that the carriage ( 3 ) via a set screw ( 7 ) with the base part ( 2 ) operable to adjust the position of the carriage ( 3 ) relative to the base part ( 2 ) serves. Dropouts ( 1 ) according to one of the preceding claims, characterized in that the nut ( 18 ) from the inside into the contour of the oblong holes ( 5 ) intervene. Dropouts ( 1 ) according to one of the preceding claims, characterized in that a carriage ( 3 ) an adapter ( 9 ) for a caliper of a disc brake. Dropouts ( 1 ) according to one of the preceding claims, characterized in that a carriage ( 3 ) a torque support ( 15 ) having. Dropouts ( 1 ) according to one of the preceding claims, characterized in that the carriage ( 3 ) with regard to the framework ( 12 ) within the basic parts ( 2 ) is arranged. Dropouts ( 1 ) according to one of the preceding claims, characterized in that the base part ( 2 ) is designed arcuate. Bicycle frame ( 10 ) with a dropout ( 1 ) according to one of the preceding claims.