US2535540A - Motorcycle frame - Google Patents

Motorcycle frame Download PDF

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Publication number
US2535540A
US2535540A US37831A US3783148A US2535540A US 2535540 A US2535540 A US 2535540A US 37831 A US37831 A US 37831A US 3783148 A US3783148 A US 3783148A US 2535540 A US2535540 A US 2535540A
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United States
Prior art keywords
tube
frame
edges
mounting member
ears
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Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US37831A
Inventor
Walter F Lechmere
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JAMES CYCLE CO Ltd
Original Assignee
JAMES CYCLE CO Ltd
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Filing date
Publication date
Application filed by JAMES CYCLE CO Ltd filed Critical JAMES CYCLE CO Ltd
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Publication of US2535540A publication Critical patent/US2535540A/en
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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
    • B62K19/18—Joints between frame members
    • B62K19/28—Means for strengthening joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/24—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles
    • B41F17/26—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles by rolling contact
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49622—Vehicular structural member making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/34—Branched
    • Y10T403/341—Three or more radiating members
    • Y10T403/345—Coplanar

Definitions

  • This invention relates to motor cycle frames.
  • motor cycle frames hitherto proposed or known it is usual to mount the stem or other supporting element of the front fork assembly in a short length of tube or a casting which forms a component part of the frame.
  • this tube is secured to the other frame members at each end by an assoelated lug presenting a pair of circular openings into one of which the tube extends and into the other of which extends a member of the frame, the lug and the tube and the lug and the frame being secured to each other by welding or brazing and the lug being customarily formed as a casting or forging or sometimes of folded sheet metal.
  • One object of the present invention is to provide a new or improved construction of mounting member for the front fork assembly which is simpler and less expensive to manufacture.
  • a further object of the present invention is to provide a new combination of front fork assembly mounting member and frame construction which is of great strength and at the same time simple and inexpensive to manufacture.
  • FIG. 1 illustrates a motor cycle frame constructed in accordance with the invention includmg a mounting member for the front fork assembly also constructed in accordance with the inventlon, the whole being shown in "Side elevation.
  • Figure 2 is a fragmentary view of the construction shown in Figure 1 showing in side elevation the position of attachment of the mounting member on the motor cycle frame.
  • Figure 3 is a plan view of the parts shown in Figure 2.
  • Figure 4 is a cross sectional view on the line 4-4 of the parts shown in Figure 2.
  • Figure 5 is a perspective view of the mounting member alone.
  • Figure 6 is a view of the sheet metal blank constituting one of the elements from which the mounting member is constructed and is shown prior to folding.
  • Figure 7 is a fragmentary view of the lower end of the mounting member shown in section on the line 1- of Figure 2.
  • the motor cycle frame comprises-at the rear a saddle tube In of usual construction secured at each end by lugs H and I2 also of usual construction to conventional rear frame members I 3 and M.
  • the position of the rear wheel of the motor cycle is indicated by the chain dotted lines IS.
  • the front portion of the frame is formed of asingle length of tube secured at one end to the upper portion of the saddle tube by means of the lug II and at the other end to the lower portion of the saddle tube by means of the lug 52.
  • this front portion is bent into loop formation and comprises an upper approximately horizontal length 16 and a lower approximately 'horiztonal length I I, each of these lengths extending forwardly from respective upper and lower portions of the saddle tube lugs H and H.
  • the forward ends of the lengths l6 and ii are connected by a forwardly disposed length of tube ii! which merges with the length 48 through a rounded corner or arcuate portion IS.
  • the mounting member for the front fork assembly seen generally at '20, Figure 1 comprises a length of tube 2! which is adapted to receive complementary supporting elements of the front fork assembly.
  • the ends of the tube may be bored out to a larger internal diameter as at 22 compared with the central portion of the tube as at 23, an internal axially directed shoulder 24 thereby existing at each end of the tube and forming in conjunction with the machined portion 22 a housing for the bearings on the front fork assembly constituting the supporting elements therefor.
  • a further part of the mounting member comprises a plate which is shown in Figure 6 in the form of a blank prior to its application to the tube 2!.
  • the plate comprises a central portion indicated generally at 25 which is bent round to part cylindrical form so as to embrace the front portion 25 of the circular cross section tube 2
  • the length of the plate may be such that it is equal to the length of the tube and in applying it to the tube it is arranged so that its upper and lower edges 21 and 28 of the central portion are flush with corresponding ends of the tube as seen in Figures 2 and 5, or alternatively the plate may be initially somewhat longer than the tube and the upper and lower edges may be subjected to a machining operation after application to the'tube 2
  • the plate has side portions 25 and 39 as seen in Figure 6 and these are folded towards each other and are directed rearwardly on either side of the tube 2
  • Each side portion is provided at its upper edge with an ear 3
  • edges 35 of the upper ears and the edges 36 of the lower ears are of suitable concave formation corresponding with the external curvature of the tube 2
  • the line along the edge of the upper and lower ears is bent as indicated by the dotted lines 31, Figure 6, and is preferably spaced inwardly from the corresponding edges 2'! or 28 of the central portion of the plate, the ears being separated from the edges 2'! and 28 by small open-ended slots 38 so that after bending, the ears l'e in a plane spaced inwardly from the ends of the tube and engage the side walls of the tube at positions spaced inwardly from the ends thereof.
  • the plate folded and bent as described to the tube 2i it is suitably welded or brazed to the tube as for instance by applying a fillet weld along the tangential junction of the tube 2
  • the rear edges 39 of the side portions are preferably of concave formation corresponding with the curvature of the arcuate portion IQ of the frame and the width of the side portions is such that the concave edges lie level with the axis or centreline of the tubular member of the frame to which the mounting member is applied.
  • of upper and lower ears respectively are also of suitable concave formation so that in the bent position of the ears these edges lie closely against the arcuate portion IQ of the frame.
  • the arcuate portion ill of the frame is engaged with the nternal side walls of the cavity defined by the side portions 22 and 88 and the ears 3
  • extending downwardly and somewhat forwardly to correspond with the steering axis of the motor cycle.
  • the front fork assembly is shown in position at 42 by the dotted lines in Figure l.
  • the plate of the mounting member includes an opening in the central portion which as seen in the drawings at 44-, may be of oval form.
  • This opening in the blank may be used for the insertion of a name plate or transfer and is found also to facilitate the folding of the blank around the tube 2
  • sad means comprising a pair of circular holes 43 extending through the material on the plate.
  • welding is employed to denote the method of securing the plate to the tube of the front fork assembly mounting member, and the method of securing the plate to the motor cycle frame, it will be understood that it is within the scope of the invention to employ brazing to effect such securing.
  • a motor cycle frame the combination of a main frame of looped formation in which the upper and forward members are formed of a single length of tube and merge into one another through an arcuate portion, with a mounting member for the front fork assembly comprising a bearing tube and a folded sheet metal plate having a part-cylindrical central portion embracing the tube and welded thereto, and rearwardly directed side portions on each side of said tube extending tangentially and substantially parallel to each other from the walls of said tube to define a cavity into which the arcuate porton of the frame engages, the arcuate portion being positioned in substantially tangential relationship to said bearing tube, and being welded to said side port'ons of the sheet metal plate.
  • the mounting member comprises a bearing tube and a folded sheet metal plate having a part-cylindrical central portion embracing the front portion of the tube, rearwardly directed side port'ons on each side of the tube extending tangentially and substantially parallel to each other from the walls of the tube, said side portions being connected together at their upper and lower edges by integrally formed ears, the rear edges of which are of concave arcuate form, so that said side portions and ears define a hollow body adapted to receive the arcuate member of the frame in contact with the inner side walls of said body and with the rear edges of said ears.
  • the mounting member comprises a bearing tube and a folded sheet metal plate having a part cyl ndrical central portion embracing the front portion of the tube, and rearwardly directed-side portions on each side of the tube extendin tangentially and substantially parallel to each other from the walls of the tube, said side portions having rear edges of arcuate form corresponding with the curvature of sad arcuate member of the frame and substantially level with the axis of the arcuate member.

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

Description

Dec. 26, 1950 w, LECHMERE 2,535,540
MOTORCYCLE FRAME Filed July 9, 1948 mvsn'ron AGENT Patented Dec. 26, 1950 UNITED STATES PATENT OFFICE Walter F. Lechmere, Birmingham, England, as-
signor to The James Cycle Company Limited, Birmingham, England Application July 9, 1948, Serial No. 37,831 In Great Britain February 3, 1948 3 Claims. 1 This invention relates to motor cycle frames. In motor cycle frames hitherto proposed or known it is usual to mount the stem or other supporting element of the front fork assembly in a short length of tube or a casting which forms a component part of the frame. In the most com moo form of construction this tube is secured to the other frame members at each end by an assoelated lug presenting a pair of circular openings into one of which the tube extends and into the other of which extends a member of the frame, the lug and the tube and the lug and the frame being secured to each other by welding or brazing and the lug being customarily formed as a casting or forging or sometimes of folded sheet metal.
One object of the present invention is to provide a new or improved construction of mounting member for the front fork assembly which is simpler and less expensive to manufacture.
A further object of the present invention is to providea new combination of front fork assembly mounting member and frame construction which is of great strength and at the same time simple and inexpensive to manufacture.
Referring to thedrawingsz Figure 1 illustrates a motor cycle frame constructed in accordance with the invention includmg a mounting member for the front fork assembly also constructed in accordance with the inventlon, the whole being shown in "Side elevation.
Figure 2 is a fragmentary view of the construction shown in Figure 1 showing in side elevation the position of attachment of the mounting member on the motor cycle frame.
Figure 3 is a plan view of the parts shown in Figure 2.
Figure 4 is a cross sectional view on the line 4-4 of the parts shown in Figure 2.
Figure 5 is a perspective view of the mounting member alone.
Figure 6 is a view of the sheet metal blank constituting one of the elements from which the mounting member is constructed and is shown prior to folding.
Figure 7 is a fragmentary view of the lower end of the mounting member shown in section on the line 1- of Figure 2.
As seen in Figure 1 the motor cycle frame comprises-at the rear a saddle tube In of usual construction secured at each end by lugs H and I2 also of usual construction to conventional rear frame members I 3 and M. The position of the rear wheel of the motor cycle is indicated by the chain dotted lines IS.
The front portion of the frame is formed of asingle length of tube secured at one end to the upper portion of the saddle tube by means of the lug II and at the other end to the lower portion of the saddle tube by means of the lug 52.
Between the lugs H and i2 this front portion is bent into loop formation and comprises an upper approximately horizontal length 16 and a lower approximately 'horiztonal length I I, each of these lengths extending forwardly from respective upper and lower portions of the saddle tube lugs H and H. The forward ends of the lengths l6 and ii are connected by a forwardly disposed length of tube ii! which merges with the length 48 through a rounded corner or arcuate portion IS.
The mounting member for the front fork assembly seen generally at '20, Figure 1, comprises a length of tube 2! which is adapted to receive complementary supporting elements of the front fork assembly. For instance as seen in Figure '7, the ends of the tube may be bored out to a larger internal diameter as at 22 compared with the central portion of the tube as at 23, an internal axially directed shoulder 24 thereby existing at each end of the tube and forming in conjunction with the machined portion 22 a housing for the bearings on the front fork assembly constituting the supporting elements therefor.
A further part of the mounting member comprises a plate which is shown in Figure 6 in the form of a blank prior to its application to the tube 2!. The plate comprises a central portion indicated generally at 25 which is bent round to part cylindrical form so as to embrace the front portion 25 of the circular cross section tube 2|.
The length of the plate may be such that it is equal to the length of the tube and in applying it to the tube it is arranged so that its upper and lower edges 21 and 28 of the central portion are flush with corresponding ends of the tube as seen in Figures 2 and 5, or alternatively the plate may be initially somewhat longer than the tube and the upper and lower edges may be subjected to a machining operation after application to the'tube 2| so as to obtain a flush relation betweenthe ends of the tube and the edges 21 and 28; of the plate.
At either side of the central portion the plate has side portions 25 and 39 as seen in Figure 6 and these are folded towards each other and are directed rearwardly on either side of the tube 2| and extend tangentially of the walls of the tube 2| and substantially parallel to each other as best seen in Figure 4.
Each side portion is provided at its upper edge with an ear 3| and at its lower edge is an ear 32 which, after the side portions have been folded towards each other are bent inwardly so that the inner edges 33 of the upper ears and inner edges 34 of the lower ears lie adjacent each other.
The edges 35 of the upper ears and the edges 36 of the lower ears are of suitable concave formation corresponding with the external curvature of the tube 2| so that after bending inwardly, they lie closely against the outer wall of the tube. Also the line along the edge of the upper and lower ears is bent as indicated by the dotted lines 31, Figure 6, and is preferably spaced inwardly from the corresponding edges 2'! or 28 of the central portion of the plate, the ears being separated from the edges 2'! and 28 by small open-ended slots 38 so that after bending, the ears l'e in a plane spaced inwardly from the ends of the tube and engage the side walls of the tube at positions spaced inwardly from the ends thereof.
After applying the plate folded and bent as described to the tube 2i it is suitably welded or brazed to the tube as for instance by applying a fillet weld along the tangential junction of the tube 2| and the side portions 29 and 38. Adjacent edges 33 and 34 of corresponding ears are also welded or brazed together.
As applied to the forwardly disposed tu ular member of the motor cycle frame including a rounded corner portion l9 as described, the rear edges 39 of the side portions are preferably of concave formation corresponding with the curvature of the arcuate portion IQ of the frame and the width of the side portions is such that the concave edges lie level with the axis or centreline of the tubular member of the frame to which the mounting member is applied. The edges 48 and 4| of upper and lower ears respectively are also of suitable concave formation so that in the bent position of the ears these edges lie closely against the arcuate portion IQ of the frame.
The arcuate portion ill of the frame is engaged with the nternal side walls of the cavity defined by the side portions 22 and 88 and the ears 3| and 32 of the plate and is suitably Welded or brazed The axis of the tube 2| extending downwardly and somewhat forwardly to correspond with the steering axis of the motor cycle. The front fork assembly is shown in position at 42 by the dotted lines in Figure l.
Preferably the plate of the mounting member includes an opening in the central portion which as seen in the drawings at 44-, may be of oval form. This opening in the blank may be used for the insertion of a name plate or transfer and is found also to facilitate the folding of the blank around the tube 2|.
In the upper part of the side portions 29 and 35 means are included whereby the tank of the motor cycle may be secured at its forward end,
sad means comprising a pair of circular holes 43 extending through the material on the plate.
Although in the claims which follow the term welding is employed to denote the method of securing the plate to the tube of the front fork assembly mounting member, and the method of securing the plate to the motor cycle frame, it will be understood that it is within the scope of the invention to employ brazing to effect such securing.
What I claim then is:
1. In a motor cycle frame the combination of a main frame of looped formation in which the upper and forward members are formed of a single length of tube and merge into one another through an arcuate portion, with a mounting member for the front fork assembly comprising a bearing tube and a folded sheet metal plate having a part-cylindrical central portion embracing the tube and welded thereto, and rearwardly directed side portions on each side of said tube extending tangentially and substantially parallel to each other from the walls of said tube to define a cavity into which the arcuate porton of the frame engages, the arcuate portion being positioned in substantially tangential relationship to said bearing tube, and being welded to said side port'ons of the sheet metal plate.
2. In a motor cycle frame in which a mounting member for a front fork assembly is welded to a tubular arcuate member joining the upper and forward members of the frame, the mounting member comprises a bearing tube and a folded sheet metal plate having a part-cylindrical central portion embracing the front portion of the tube, rearwardly directed side port'ons on each side of the tube extending tangentially and substantially parallel to each other from the walls of the tube, said side portions being connected together at their upper and lower edges by integrally formed ears, the rear edges of which are of concave arcuate form, so that said side portions and ears define a hollow body adapted to receive the arcuate member of the frame in contact with the inner side walls of said body and with the rear edges of said ears.
3. In a motor cycle frame in which a mounting member for a front fork assembly is welded to a tubular arcuate member joining the upper and forward members of the frame, the mounting member comprises a bearing tube and a folded sheet metal plate having a part cyl ndrical central portion embracing the front portion of the tube, and rearwardly directed-side portions on each side of the tube extendin tangentially and substantially parallel to each other from the walls of the tube, said side portions having rear edges of arcuate form corresponding with the curvature of sad arcuate member of the frame and substantially level with the axis of the arcuate member.
W. F. LECHMERE.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Great Britain 'Apr. 21, 1932
US37831A 1948-02-03 1948-07-09 Motorcycle frame Expired - Lifetime US2535540A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043581A (en) * 1959-05-18 1962-07-10 Thompson Ramo Wooldridge Inc Shock absorber spring clamp
US3508765A (en) * 1967-06-07 1970-04-28 Norton Villiers Ltd Motorcycle frame
US4699233A (en) * 1984-06-25 1987-10-13 Honda Giken Kogyo Kabushiki Kaisha Vehicle body frame of motor bicycle
WO1989008039A1 (en) * 1988-03-02 1989-09-08 Bivaco A.S. Bicycle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189811461A (en) * 1898-05-20 1899-05-20 William Huggins Improvements in and relating to Steam Engines.
FR550100A (en) * 1923-02-26
GB227205A (en) * 1923-10-13 1925-01-13 Alfred Wiseman Ltd Improvements in or relating to frames for cycles, motor cycles, and the like
FR588459A (en) * 1924-01-16 1925-05-07 Process for manufacturing frames for bicycles, motorcycles and the like
US1760955A (en) * 1925-12-24 1930-06-03 Linde Air Prod Co Joint for structural shapes and method of making the same
GB371198A (en) * 1931-05-28 1932-04-21 Enfield Cycle Co Ltd Improvements relating to frames for motor cycles, and their manufacture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR550100A (en) * 1923-02-26
GB189811461A (en) * 1898-05-20 1899-05-20 William Huggins Improvements in and relating to Steam Engines.
GB227205A (en) * 1923-10-13 1925-01-13 Alfred Wiseman Ltd Improvements in or relating to frames for cycles, motor cycles, and the like
FR588459A (en) * 1924-01-16 1925-05-07 Process for manufacturing frames for bicycles, motorcycles and the like
US1760955A (en) * 1925-12-24 1930-06-03 Linde Air Prod Co Joint for structural shapes and method of making the same
GB371198A (en) * 1931-05-28 1932-04-21 Enfield Cycle Co Ltd Improvements relating to frames for motor cycles, and their manufacture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043581A (en) * 1959-05-18 1962-07-10 Thompson Ramo Wooldridge Inc Shock absorber spring clamp
US3508765A (en) * 1967-06-07 1970-04-28 Norton Villiers Ltd Motorcycle frame
US4699233A (en) * 1984-06-25 1987-10-13 Honda Giken Kogyo Kabushiki Kaisha Vehicle body frame of motor bicycle
WO1989008039A1 (en) * 1988-03-02 1989-09-08 Bivaco A.S. Bicycle

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