EP0142605A1 - Box beam bicycle type frame - Google Patents
Box beam bicycle type frame Download PDFInfo
- Publication number
- EP0142605A1 EP0142605A1 EP84107364A EP84107364A EP0142605A1 EP 0142605 A1 EP0142605 A1 EP 0142605A1 EP 84107364 A EP84107364 A EP 84107364A EP 84107364 A EP84107364 A EP 84107364A EP 0142605 A1 EP0142605 A1 EP 0142605A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- section
- reach
- cross
- reach tube
- Prior art date
- 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.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B22/00—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements
- A63B22/06—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with support elements performing a rotating cycling movement, i.e. a closed path movement
- A63B22/0605—Exercising apparatus specially adapted for conditioning the cardio-vascular system, for training agility or co-ordination of movements with support elements performing a rotating cycling movement, i.e. a closed path movement performing a circular movement, e.g. ergometers
Definitions
- This invention relates generally to bicycle type apparatus and more particularly to bicycle type exercisers, although it may be equally applicable to the upwardly open type frame used on girls' and ladies' bicycles.
- Bicycle type exercisers are stationary but otherwise similar in many respects to bicycles and use some of the same parts.
- An upwardly open girls' or ladies' bicycle frame is often used, having twin, parallel, curved reach tubes.
- Fig. 1 of U. S. Patent 3,664,027 issued May 23, 1972 to Albert J. Fritz and Rudolph L. Schwinn A further example of that prior art construction is shown in Figs. 5 and 6.
- this invention provides a frame of less weight and more strength and rigidity for bicycle type apparatus of the kind described.
- the present invention provides a bicycle type exerciser, and the like, having a frame comprising a handlebar head tube, a seat mast, and a reach tube, comprising a closed rectangular box beam cross section having the long axis of its cross section upright and co-planar with the head tube and seat mast, said reach tube having an angular configuration in side view including a rear horizontal section secured at its rear end to the seat mast and a front diagonal section extending upwardly and forwardly and secured at its front end to the head tube.
- a stationary bicycle type exerciser generally designated 20 is shown.
- the exerciser has a support frame generally designated 22, a saddle assembly 24, a handlebar assembly 26, a pedal and crank assembly 28 rotating an adjustable resistance friction wheel 30 through sprockets 32, 34, and a chain 36 protected by a chain guard 38 and a sprocket guard 40, all made and operating in a well-known manner.
- the frame 22 which has increased strength and rigidity as a result of the present invention, it has the usual seat mast tube 42 extending upwardly and rearwardly from a crank hanger 46 to the saddle assembly 24, and a head tube 48 supporting the handlebar assembly 26.
- Rear and front fork assemblies 77 and 78 respectively include foot plates 66 and 76 mounted on floor-engaging feet 84.
- a horizontal bracket 86 connects the rear fork assembly to the crank hanger.
- the crux of the present invention is the reach tube 44 which forms part of the frame and is secured between the handlebar head 48 and the seat mast 42; as contrasted with twin, parallel, curved reach tubes 50, 52 conventionally used as shown in FIGS. 5 and 6.
- the improved reach tube 44 comprises a closed, rectangular box beam, the cross-section of which is shown in FIG. 4.
- the cross-sectional dimension should be substantially longer along the vertical axis Y-Y than along the horizontal.
- axis X-X Preferably, the long sides 54, 54 of the reach tube cross-section should be more than about twice the length of the short sides 56, 56.
- the reach tube has been made of cold rolled steel .062" thick, with long and short sides of 2" and 1" respectively.
- the reach tube 44 has an angular configuration in side view with a rear, horizontal section 58 welded at its rear end to the seat mast 42, and a front diagonal section 60 extending upwardly and forwardly and welded at its front end to the head tube 48.
- the top surface 62 of the horizontal reach tube section 58 extends along, and preferably at a level slightly above the upper surface 64 of the chain guard. It is not unusual for users to attempt to stand on the chain guard which is of relatively light construction. With the above-described construction, the chain guard will be protected from that kind of abuse because most of the downward load applied by the user will be borne by the reach tube.
- the improved rectangular cross-section reach tube 44 is cheaper, makes more efficient use of material, and is substantially twice as rigid vertically as the conventional pair of reach tubes 50, 52 shown in FIG. 5.
- the reach tubes 50, 52 are made of .062" thick round tube stock, 1.00" outside diameter, making a total cross-sectional area of 0.390 square inches and using 0.110 lbs. of steel per running inch.
- reach tube 44 is made of .062" thick rectangular tube stock 2" x 1" in outside cross section, making a total cross-sectional area of only .372 square inches, and using only 0.105 lbs. of steel per running foot.
- the improved reach tube 44 actually uses less material than the prior conventional reach tube pair 50, 52 shown in Figs. 5 and 6. It is substantially stronger and more rigid as verified by actual tests as will now be described in connection with Figs. 6 and 7.
- a frame 22a using conventional twin reach tubes 50, 52 with the dimensions described above was tested for vertical rigidity clamping the rear foot plate 66 down by clamp means 68 to block 70 fixed to floor 72 in any suitable manner.
- a roller 74 was placed between front foot plate 76 and the floor so that the front fork assembly 78 was free to deflect forwardly under load.
- a press 80 was loaded downwardly with a load of 250 lbs. applied to a roller 82 mounted at the.top of the seat mast tube 42a simulating the weight of a 250 lb. operator. Downward deflection of the roller 82, simulating deflection of the saddle assembly 24 under this loading was measured as .024".
Landscapes
- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- Vascular Medicine (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Automatic Cycles, And Cycles In General (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
- This invention relates generally to bicycle type apparatus and more particularly to bicycle type exercisers, although it may be equally applicable to the upwardly open type frame used on girls' and ladies' bicycles.
- Bicycle type exercisers are stationary but otherwise similar in many respects to bicycles and use some of the same parts. An upwardly open girls' or ladies' bicycle frame is often used, having twin, parallel, curved reach tubes. One example in shown in Fig. 1 of U. S. Patent 3,664,027 issued May 23, 1972 to Albert J. Fritz and Rudolph L. Schwinn. A further example of that prior art construction is shown in Figs. 5 and 6.
- It is important to the comfort and well-being of the user that the frame be absolutely rigid and free from noticeable deflection in operation. In practice, this is hard to achieve with the above-mentioned conventional upwardly open frame.
- Accordingly, this invention provides a frame of less weight and more strength and rigidity for bicycle type apparatus of the kind described.
- In particular, the present invention provides a bicycle type exerciser, and the like, having a frame comprising a handlebar head tube, a seat mast, and a reach tube, comprising a closed rectangular box beam cross section having the long axis of its cross section upright and co-planar with the head tube and seat mast, said reach tube having an angular configuration in side view including a rear horizontal section secured at its rear end to the seat mast and a front diagonal section extending upwardly and forwardly and secured at its front end to the head tube.
- In the drawings:
- FIGURE 1 is a perspective view of a bicycle type exerciser embodying this invention;
- FIG. 2 is a fragmentary view of FIG. 1;
- FIG. 3 is a fragmentary side view of FIG. 1;
- FIG. 4 is an enlarged cross-section of FIG. 3 taken on line 4-4;
- FIG. 5 is a view similar to FIG. 3 of a curved, twin reach tube arrangement representing the prior art; and
- FIGS. 6 and 7 are schematic side views of testing apparatus used in demonstrating the improved rigidity of the frame of the present invention compared with that of a conventional prior art frame.
- Referring now more particularly to the specific embodiment of the invention shown in the drawing, a stationary bicycle type exerciser generally designated 20 is shown.
- The exerciser has a support frame generally designated 22, a
saddle assembly 24, ahandlebar assembly 26, a pedal andcrank assembly 28 rotating an adjustableresistance friction wheel 30 throughsprockets 32, 34, and achain 36 protected by achain guard 38 and asprocket guard 40, all made and operating in a well-known manner. - Turning attention to the
frame 22 which has increased strength and rigidity as a result of the present invention, it has the usualseat mast tube 42 extending upwardly and rearwardly from acrank hanger 46 to thesaddle assembly 24, and ahead tube 48 supporting thehandlebar assembly 26. Rear andfront fork assemblies foot plates engaging feet 84. Ahorizontal bracket 86 connects the rear fork assembly to the crank hanger. - The crux of the present invention is the
reach tube 44 which forms part of the frame and is secured between thehandlebar head 48 and theseat mast 42; as contrasted with twin, parallel,curved reach tubes - The improved
reach tube 44 comprises a closed, rectangular box beam, the cross-section of which is shown in FIG. 4. For effective vertical rigidity, and securement by welding between thehead tube 48 andseat mast 42, the cross-sectional dimension should be substantially longer along the vertical axis Y-Y than along the horizontal. axis X-X. Preferably, thelong sides short sides - The
reach tube 44 has an angular configuration in side view with a rear,horizontal section 58 welded at its rear end to theseat mast 42, and a frontdiagonal section 60 extending upwardly and forwardly and welded at its front end to thehead tube 48. - Referring to FIG. 2, the
top surface 62 of the horizontalreach tube section 58 extends along, and preferably at a level slightly above the upper surface 64 of the chain guard. It is not unusual for users to attempt to stand on the chain guard which is of relatively light construction. With the above-described construction, the chain guard will be protected from that kind of abuse because most of the downward load applied by the user will be borne by the reach tube. - As will now be described, the improved rectangular
cross-section reach tube 44 is cheaper, makes more efficient use of material, and is substantially twice as rigid vertically as the conventional pair ofreach tubes reach tubes reach tube 44 is made of .062" thickrectangular tube stock 2" x 1" in outside cross section, making a total cross-sectional area of only .372 square inches, and using only 0.105 lbs. of steel per running foot. - Thus, the improved
reach tube 44 actually uses less material than the prior conventionalreach tube pair - As shown in Fig. 6, a
frame 22a using conventionaltwin reach tubes rear foot plate 66 down by clamp means 68 to block 70 fixed tofloor 72 in any suitable manner. A roller 74 was placed betweenfront foot plate 76 and the floor so that thefront fork assembly 78 was free to deflect forwardly under load. Apress 80 was loaded downwardly with a load of 250 lbs. applied to aroller 82 mounted at the.top of theseat mast tube 42a simulating the weight of a 250 lb. operator. Downward deflection of theroller 82, simulating deflection of thesaddle assembly 24 under this loading was measured as .024". - Under exactly the same conditions as shown in Fig. 7, the
frame 22 with the improved singletube reach tube 44 deflected only .014". - Thus, the important vertical rigidity of the frame is almost doubled, using less steel, when compared with the conventional double tube frame under exactly the same load conditions.
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US54979883A | 1983-11-09 | 1983-11-09 | |
US549798 | 1983-11-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0142605A1 true EP0142605A1 (en) | 1985-05-29 |
EP0142605B1 EP0142605B1 (en) | 1989-08-30 |
Family
ID=24194426
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84107364A Expired EP0142605B1 (en) | 1983-11-09 | 1984-06-26 | Box beam bicycle type frame |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0142605B1 (en) |
JP (1) | JPS6079461U (en) |
CA (1) | CA1233848A (en) |
DE (1) | DE3479568D1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD9127A (en) * | ||||
US518411A (en) * | 1894-04-17 | Bicycle | ||
GB1281731A (en) * | 1969-06-25 | 1972-07-12 | Raleigh Industries Ltd | A cycle frame |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4518913Y1 (en) * | 1967-02-14 | 1970-08-01 | ||
US3664027A (en) * | 1970-08-12 | 1972-05-23 | Schwinn Bicycle Co | Bicycle frame-size indicator |
JPS5695259U (en) * | 1979-12-22 | 1981-07-28 |
-
1984
- 1984-06-19 CA CA000456952A patent/CA1233848A/en not_active Expired
- 1984-06-26 EP EP84107364A patent/EP0142605B1/en not_active Expired
- 1984-06-26 DE DE8484107364T patent/DE3479568D1/en not_active Expired
- 1984-07-09 JP JP10255284U patent/JPS6079461U/en active Granted
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD9127A (en) * | ||||
US518411A (en) * | 1894-04-17 | Bicycle | ||
GB1281731A (en) * | 1969-06-25 | 1972-07-12 | Raleigh Industries Ltd | A cycle frame |
Also Published As
Publication number | Publication date |
---|---|
CA1233848A (en) | 1988-03-08 |
DE3479568D1 (en) | 1989-10-05 |
JPH0234928Y2 (en) | 1990-09-20 |
EP0142605B1 (en) | 1989-08-30 |
JPS6079461U (en) | 1985-06-03 |
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