WO1989008039A1 - Bicyclette - Google Patents

Bicyclette Download PDF

Info

Publication number
WO1989008039A1
WO1989008039A1 PCT/NO1989/000020 NO8900020W WO8908039A1 WO 1989008039 A1 WO1989008039 A1 WO 1989008039A1 NO 8900020 W NO8900020 W NO 8900020W WO 8908039 A1 WO8908039 A1 WO 8908039A1
Authority
WO
WIPO (PCT)
Prior art keywords
bicycle
intermediate portion
cast
bicycle according
rear section
Prior art date
Application number
PCT/NO1989/000020
Other languages
English (en)
Inventor
Jan Capjon
Original Assignee
Bivaco A.S.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bivaco A.S. filed Critical Bivaco A.S.
Publication of WO1989008039A1 publication Critical patent/WO1989008039A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B62K19/04—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity
    • B62K19/12—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly metallic, e.g. of high elasticity having cast members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K19/00—Cycle frames
    • B62K19/02—Cycle frames characterised by material or cross-section of frame members
    • B62K19/16—Cycle frames characterised by material or cross-section of frame members the material being wholly or mainly of plastics

Definitions

  • the manufacture of bicycles according to conventional methods comprises a number of production steps.
  • the bicycle frame for example, can be manufactured with as many as 17 work stations.
  • the number of work stations or steps will of course be very significant for an efficient production and thereby for the costs. Therefore simplification of the usually rather complicated manufacturing process, has great economical interest.
  • This invention aims at a novel cycle design which involves significant advantages in this respect.
  • the appearance of the bicycle may be quite strongly modified in relation to what is conventional and considered to be normal and pleasing, cast structural parts depend on a shape which allows the production tool to have a slip with respect to the cast product, which makes it difficult to cast closed profiles and thus torsion-rigid constructions, and the actual frame or middle section of a bicycle during its use is subjected to large torque stresses which call for a good torsional rigidity as just mentioned.
  • German patent application 3,145.634 shows that the appearance of a bicycle may- become rather unconventional and probably inacceptable by the use of uncommon manufacturing methods, including die- casting of the main parts of the bicycle.
  • the same in part applies to the bicycle frame according to British patent 1.281.731, which describes a frame composed of two cast shells, so that there is obtained a closed cross-section at the highly stressed frame parts.
  • a problem with the latter design is that the two assembled shells must be rigidly connected to each other in the joint along the central plane of symmetry in order that torsional stresses may be transferred therethrough.
  • Such a joint requires a high degree of dimensional accuracy in both cast parts.
  • Injection or die-cast parts however, are often subject to crimping during the production process as well as tolerance deviations and dimensional differences, depending inter alia, on the moulding time, possible alloy elements, the temperature and wear of the moulding tool and so forth.
  • cast bicycle frames for adult bicycles therefore involve very substantial problems when a fully cast design in the form of two shells is attempted in practice, because of problems of joining two shells of such large dimensions as being of interest here.
  • the present invention provides a.new and improved bicycle design the novel and specific features of which consist in the combination of: a cast rear section with bearings for a rear wheel and a crank as well as integrated details, such as a baggage rack and a mud-guard, a front fork cast in one piece with integrated details, in particular bearings for the steering movement and a front wheel, a middle section comprising two frame tubes bent to shape from a continuous length of tube and being at two rear ends rigidly connected to the rear section, said frame tubes having a common intermediate portion which constitutes an anchoring piec extending substantially parallel to the front fork for coupling thereto and pivoting thereof.
  • the structure described here implies that those parts of the bicycle frame, namely the rear part or rear section, which do not need to have any particular tortional rigidity, can be efficiently produced by moulding.
  • this rear section advantageously can be an integrated structure in which various details may be formed in one manufacturing step by moulding.
  • the middle section or the actual frame however, is based on a tubular component which in view of the tubular cross section gives the required torsional rigidity at the same time as this results in an appearance being more in compliance with that which is conventional and accepted,
  • the front fork is moulded or cast in one piece with integrated details.
  • the intermediate portion of the frame tubes has an internal reinforcement member and possibly a co-operating external attachment member having bearing parts for journalling the front fork.
  • this can either be formed by complementary shells as mentioned above, or it can be cast in one piece as a whole.
  • the invention also comprises a specific method for manufacturing said frame tubes which constitute essential components in the bicycle design described here.
  • This form of frame tubes in co-operation with the other cast main parts, give the bicycle high strength in the highly stressed and critical area where the front fork is connected to and ournalled at the frame.
  • Fig. 1 shows in elevation a bicycle built according to this invention.
  • Fig. 2 shows in enlarged longitudinal section important details of the common intermediate portion of the frame tubes
  • Fig. 3 shows a reinforcement member in a subtantially rectilinear condition before insertion into and bending together with the frame tubes
  • Fig. 4 shows a rear section based on two shells, for the bicycle in Fig. 1, somewhat more in detail and in elevation, as welll as accompanying cross sections in Fig. 4A - 4E,
  • Fig. 5 shows one of the two shell castings which are incorporated in the frame of Fig. 4, and in end elevation.
  • Fig. 6 shows another embodiment of the rear section based on casting as one piece and seen in elevation
  • Fig. 7 shows an end elevation of the rear section of Fig. 6,
  • Fig. 8 shows a front fork cast in one piece and being with advantage incorporated in the bicycle of Fig. 1, with accompanying cross sections in Fig. 8A - 8C.
  • the main parts of the bicycle design shown in Fig. 1 are as follows: a middle section formed by two frame tubes 1 and 2 which have a common intermediate portion 4, the frame tubes being bent to shape from a continuous length of tube, taking into account particularly the critically stressed intermediate portion 4 which extends generally in parallel to the adjacent part of the front fork 3.
  • the rear section of the bicycle consists of the parts 6, 7, 8 and 9 which are manufactured by casting, for example either die- cast light metal or injection moulded plastic composite material.
  • the frame tubes 1 and 2 are rigidly connected to the rear section.
  • the rear section has a bearing piece 18 for the rear wheel axle of the bicycle.
  • the bicycle has other necessary parts and components, such as a handle-bar 10 and a seat 13 with a supporting seat tube 15 and a seat tube clamp memeber 16 which constitutes a part of the rear section.
  • the specific design of the frame tubes leads to advantages both with respect to an efficient manufacture and with respect to mechanical strength conditions.
  • the rigidity of the tubes is maintained through the common intermediate portion 4 as mentioned, which besides has an interior reinforcement which will be explained below with reference to Fig. 2 and 3.
  • Fig.2 shows more in detail the intermediate portion 4 at the transition region between the frame tubes 1 and 2.
  • a reinforcement member 14 which is bent together with the tube to the shape shown.
  • the member 14 has a shape as shown in Fig. 3, so that it can easily be inserted into the initially straight length of tube which is going to form the frame tubes 1 and 2 with the common intermediate portion 4.
  • the member 14 has a main portion which extends in the longitudinal direction and projecting transverse portions, of which one portion 14C is indicated in Fig. 3, so that the member 14 can easily take part in the bending operation so as to fill the inner tube cross section at the intermediate portion 4 as shown in Fig. 2.
  • this tube cross section thus becomes somewhat reduced in relation to the cross section of the remaining length of the frame tubes
  • the reinforcement member 14 has a tongue- like extension which is in conformity with the transitional region between the frame tube 1 and the intermediate portion 4 having a reduced cross section.
  • the tongue 14D has a particular reinforcement effect at this location.
  • a similar tongue or extension possibly may also be provided at the opposite end of the member 14.
  • This member moreover has anchoring holes 14A and 14B at its ends. According to Fig.
  • these holes receive bolts 21 and 22 for the attachment of an exterior anchoring member 24 having a contour adapted to the bent shape of the intermediate portion 14.
  • the anchor ⁇ ing member 24 has bearing pieces 25 and 26 for journalling of the front fork 3, which is also shown in Fig. 1.
  • FIG. 4 and 5 shows an embodiment of the rear section of the bicycle, based on two shells or halves, of which one is shown in Fig. 5.
  • Fig. 4 and 5 show main parts 6, 7, 8 and 9, of which the latter part constitutes or carries a baggage rack and completely or in part can form the rear mud-guard of the bicycle.
  • a retractable rear mud-guard member 19 which when its use is not desired, can be hidden in a retracted position in the interior of the baggage rack structure.
  • FIG. 4A and 4B show how the two shell parts 31 and 32 clamp the respective frame tubes and how anchoring takes place by means of transverse bolts.
  • the attachment holes of the tubes, for example 33, are flanged as shown at 39 (Fig. 4A) in order to distribute the tighten ⁇ ing forces.
  • Fig. 4C and 4D show the cross section of one shell at the central portion of the respec ⁇ tive stays or main parts 8 and 7.
  • the basic main part 6 has a cross section as shown more in detail in Fig. 4E, which in particular illustrates a groove- and tongue connection 31A -
  • FIG. 6 and 7 Another possible embodiment of the rear section as shown in Fig. 6 and 7, is based on the casting or moulding of the whole section as one piece. This requires that the design must make possible the pulling out of the moulding tool parts, which is obtained here by means of a substan ⁇ tially U-shaped cross section being open downwardly and rearwardly, so that the direction of pulling out the moulding tool will be as indicated with arrow T in Fig. 6.
  • the angle of inclination of the supporting stay 58 from the seat tube and baggage rack region 66/59 to the wheel bearings at 68 involves a sufficient draft angle in order that a tool core can be pulled out in spite of a slight narrowing of the stay in the direction towards the wheel bearings.
  • the remaining main parts 56 and 57 of this rear section are provided with stiffening ribs 55A, 55B, 55C and so forth, having such an orientation that they coincide with the pull- out direction T.
  • FIG. 6 The configuration of the main parts 56, 57, 58 and 59 in the rear section 50 of Fig. 6 and 7 correspond substan ⁇ tially to the arrangment of Fig. 4, except that the embodi ⁇ ment of Fig. 6 and 7 is moulded in one piece.
  • a hole and attachment means for an upper frame tube (not shown) .
  • the design of the front fork as illustrated in Fig. 8 is also based on moulding as one piece, having essentially U-shaped cross sections the open side of which is directed rearwardly with respect to the longitudinal direction of the bicycle.
  • the cross sectional shape at various places is shown in particular in Fig. 8A, 8B and 8C.
  • the front fork will have an attractive appearance at the same time as its properties with respect to mechanical strength are good.
  • This also applies to the pivot or coupling region 41 which through the bearing pieces 25 and 26 (see Fig. 1 and 2) shall co-operate with the remaining parts of the bicycle frame.
  • This region 41 is relatively wide, this inter alia, in view of the forming of an inte- grated cavity 42 which faces forwardly and shall serve to receive a light and possible batteries.
  • the cavity 42 is then closed with a suitable cover which can also comprise a light glass.
  • Moulding makes it possible in an advantageous way to integrate various details in the design, in particular various cavities which inherently turn out in moulded structures, for example cavities in the front fork for a light, batteries, etc. and in a like manner in the baggage rack for a pump, a mud-guard and so forth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Cycles, And Cycles In General (AREA)
  • Motorcycle And Bicycle Frame (AREA)

Abstract

Un bicyclette comportant les parties principales essentielles se compose d'éléments métalliques légers coulés ou d'éléments composites en plastique moulés par injection. Elle comprend une partie arrière coulée ou moulée (6, 7, 8, 9) dotée de supports pour une roue arrière et une manivelle ainsi que des accessoires intégrés tels qu'un porte-bagage (9) et un garde-boue, une fourche frontale (3) coulée ou moulée d'une pièce avec des éléments intégrés, notamment des supports (25, 26) pour les mouvements de direction ainsi que pour une roue avant. Une partie centrale comprend deux tubes (1, 2) de cadre courbés pour former une longueur de tube continue et assemblé rigidement à la partie arrière (6) au niveau de ses deux extrémités arrière (11, 12). Ces tubes de cadre (1, 2) ont une partie intermédiaire commune (4) constituant une pièce d'ancrage s'étendant sensiblement parallèlement à la fourche frontale (3) pour s'y accoupler et pivoter.
PCT/NO1989/000020 1988-03-02 1989-02-28 Bicyclette WO1989008039A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO880915A NO880915D0 (no) 1988-03-02 1988-03-02 Sykkel.
NO880915 1988-03-02

Publications (1)

Publication Number Publication Date
WO1989008039A1 true WO1989008039A1 (fr) 1989-09-08

Family

ID=19890704

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO1989/000020 WO1989008039A1 (fr) 1988-03-02 1989-02-28 Bicyclette

Country Status (3)

Country Link
AU (1) AU3204989A (fr)
NO (1) NO880915D0 (fr)
WO (1) WO1989008039A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4006095A1 (de) * 1990-02-27 1991-08-29 Fred Hildebrandt Fahrrad
US5533742A (en) * 1991-08-06 1996-07-09 Axis Bicycle Incorporated All-terrain bicycle frame
US6994367B2 (en) * 2003-07-09 2006-02-07 Trek Bicycle Corporation Metal and reinforced plastic composite bicycle frame
US7597338B2 (en) 2005-08-26 2009-10-06 Giant Manufacturing Co., Ltd. Bicycle frame with multiple layer tube
CN104118513A (zh) * 2014-07-24 2014-10-29 联威（天津）碳纤维复合材料科技有限公司 注塑自行车架及其制备方法
WO2018134006A1 (fr) * 2017-01-19 2018-07-26 Continental Bicycle Systems Gmbh & Co. Kg Châssis de véhicule destiné à recevoir un accumulateur d'énergie
US11142280B2 (en) 2016-03-24 2021-10-12 The Hive Global, Inc. Bicycle crank with spindle attachment structure
US11351815B2 (en) 2017-08-21 2022-06-07 The Hive Global, Inc. Bicycle cassette with clamping connection
US11485449B2 (en) 2015-09-01 2022-11-01 The Hive Global, Inc. Bicycle cassette with locking connection
US11932351B2 (en) 2020-07-17 2024-03-19 The Hive Global, Inc. Conical bicycle cassette sprocket structure
US12030586B2 (en) 2021-07-12 2024-07-09 The Hive Global, Inc. Seal for bicycle crank with differential chainring motion

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR550100A (fr) * 1923-02-26
FR588459A (fr) * 1924-01-16 1925-05-07 Procédé de fabrication des cadres de bicyclettes, motocyclettes et véhicules analogues
US2470441A (en) * 1946-10-11 1949-05-17 Doehler Jarvis Corp Bicycle frame
US2535540A (en) * 1948-02-03 1950-12-26 James Cycle Co Ltd Motorcycle frame
GB1508342A (en) * 1974-03-29 1978-04-26 Ramond L Fork for a steerable wheel of a cycle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR550100A (fr) * 1923-02-26
FR588459A (fr) * 1924-01-16 1925-05-07 Procédé de fabrication des cadres de bicyclettes, motocyclettes et véhicules analogues
US2470441A (en) * 1946-10-11 1949-05-17 Doehler Jarvis Corp Bicycle frame
US2535540A (en) * 1948-02-03 1950-12-26 James Cycle Co Ltd Motorcycle frame
GB1508342A (en) * 1974-03-29 1978-04-26 Ramond L Fork for a steerable wheel of a cycle

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4006095A1 (de) * 1990-02-27 1991-08-29 Fred Hildebrandt Fahrrad
US5533742A (en) * 1991-08-06 1996-07-09 Axis Bicycle Incorporated All-terrain bicycle frame
US6994367B2 (en) * 2003-07-09 2006-02-07 Trek Bicycle Corporation Metal and reinforced plastic composite bicycle frame
US7597338B2 (en) 2005-08-26 2009-10-06 Giant Manufacturing Co., Ltd. Bicycle frame with multiple layer tube
CN104118513A (zh) * 2014-07-24 2014-10-29 联威（天津）碳纤维复合材料科技有限公司 注塑自行车架及其制备方法
US11485449B2 (en) 2015-09-01 2022-11-01 The Hive Global, Inc. Bicycle cassette with locking connection
US11142280B2 (en) 2016-03-24 2021-10-12 The Hive Global, Inc. Bicycle crank with spindle attachment structure
WO2018134006A1 (fr) * 2017-01-19 2018-07-26 Continental Bicycle Systems Gmbh & Co. Kg Châssis de véhicule destiné à recevoir un accumulateur d'énergie
US11351815B2 (en) 2017-08-21 2022-06-07 The Hive Global, Inc. Bicycle cassette with clamping connection
US11932351B2 (en) 2020-07-17 2024-03-19 The Hive Global, Inc. Conical bicycle cassette sprocket structure
US12030586B2 (en) 2021-07-12 2024-07-09 The Hive Global, Inc. Seal for bicycle crank with differential chainring motion

Also Published As

Publication number Publication date
AU3204989A (en) 1989-09-22
NO880915D0 (no) 1988-03-02

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