JP2010070183A - Rocking pedal driven bicycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rocking pedal driven bicycle having such simple construction that a pedal lever pivotally supported at its supporting point position on the midway of a chain stay is supported at its midway around the crank pin of a crank oppositely journaled to both sides of a bottom bracket, and pedals are horizontally provided at the free ends of the pedal lever, wherein the right and left pedals are alternately moved up and down with leg pedalling and drawing operation for rocking the pedal lever up and down to drive a rear wheel through a crank mechanism or a transmission means. <P>SOLUTION: A groove pulley is borne on the crank pin of the crank oppositely mounted at both ends of a crankshaft journaled to the bottom bracket, the pedal lever is pivotally supported at its supporting point position on a support mounted on the chain stay, the pedal lever is supported at its lower edge in the groove pulley, and the pedals are horizontally provided at the free ends. The right and left pedals are alternately moved up and down with leg pedalling and drawing operation for rocking the pedal lever up and down to drive the rear wheel through the crank mechanism or the transmission means. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a bicycle driven by a pedal that swings up and down.

Technical background

  As a background art, instead of a normal bicycle crank pedal drive system, a bicycle driven by a swing pedal is used as a pair of chain sprockets or belt vehicles pivotally supported on the left and right frames of the rear wheel. Protrusion corresponding to a pin is attached, and a chain, sprocket or belt wheel is driven via a protrusion by a long pedal lever that can swing up and down, and transmitted to the rear wheel by a chain or belt transmission means (For example, refer to Patent Document 1).

  In addition, the pedal stroke of a normal bicycle provides an effective crank driving force equivalent to 50% of the operating power at a pedal depression stroke, that is, a stepping leg stroke at a rotation angle of about 120 degrees from the front upper part to the lower part of the pedal. The remaining 240 degrees of rotational motion includes backward pulling, lifting and forward pushing strokes, and so-called pulling stroke strokes consume about 50% of the operating power. At the both ends of the shaft, the base end portion of the crank is attached via a one-way clutch, and a driving force is obtained by a crank operation with a rotation angle of about 120 degrees in the stepping leg stroke via a pedal at the free end. The pedal that reciprocally swings up and down by reducing the rotation angle of the stepping leg stroke in the opposite direction, and thus reducing the pulling leg stroke in the rotary pedal system, and the rotational movement of about 240 degrees by half. Replaced with a simple operation, is of a type to improve the crank drive efficiency (e.g., see Patent Document 2.).

  The thing of patent document 1 is equivalent to the crank pin which protruded in a pair of chain sprocket which supported the fulcrum of a long pedal lever on both right and left sides of a rear-wheel axis | shaft, and was supported on both sides of a rear-wheel main body right-and-left frame. The mechanism for sliding the guide groove in the middle of the pedal lever to the protrusion and driving the crank by reciprocating the pedal lever up and down is a so-called quick return motions mechanism with a crank and a swing lever. When the support position of the grooved wheel approaches the fulcrum side of the pedal lever, the swing displacement angle tends to increase rapidly, that is, it tends to swing quickly, and the stepping and pulling movements of the pedal stroke are Fast return operation and lack of smoothness, and the driving force of the crank is the chain sprocket or belt wheel of each pair of transmission means arranged on both sides of the rear wheel. It can be transmitted to the rear wheels via freewheels and has a complicated structure.

  Although the thing of patent document 2 is aiming at a simple structure, difficulty is contained in implementation of the component structure attached to a crank via a one-way clutch at both ends of a crankshaft, and remodeling around the bottom bracket of a normal bicycle. ing.

JP2001-199375 Utility model registration No. 3100035

  The present invention has been made in view of various problems in implementation in the background art described above, and an object of the present invention is to provide a crank of a small-diameter crank that is pivotally supported on both sides of the bottom bracket at the front end of the chain stay. Around the pin, the middle of the chain stay supports the middle of the pedal lever, and the pedal lever is installed horizontally at the free end of the pedal lever. The above-mentioned problems are solved by providing a swing pedal-driven bicycle having a simple configuration that swings to drive a crank mechanism and can drive a rear wheel through transmission means.

  In order to achieve the above object, in the swing pedal drive type bicycle of the present invention, small-diameter cranks are opposed to the left and right ends of the crankshaft pivotally supported by the bottom brackets at the front of the chain stay on both sides of the rear wheel. The crank pin of the crank is supported by a grooved wheel, and the fulcrum of the pedal lever is pivotally supported by a support tool installed in the middle of the chain stay, and the lower edge of the pedal lever is supported by the grooved wheel. In addition, a pedal is provided horizontally at the free end of the lever, and the left and right pedals are alternately raised and lowered by a stepping leg operation and a pulling leg operation, and the pedal lever is swung up and down to crank mechanism or crank. The shaft is driven, and the rear wheels can be driven through the transmission means.

  Further, the pedal lever is formed with a mountain-shaped bent slope at the lower edge between the center position and the fulcrum position, and the pedal lever, the groove wheel and the crank are operated by the stepped leg pedal as the main driving side. Drive the shaft, and support the lower edge of the pedal lever on the pulling leg side on the driven side groove facing the main wheel side of the opposite side crank, and the support position moves to the fulcrum position side. When presenting a rapid increase tendency of upward swinging displacement, so-called rapid return swinging tendency, by introducing the grooved wheel into the section of the curved slope, the swinging displacement is reduced and the rapid return swinging tendency is suppressed. The operation of the pulling leg side pedal and the pedal lever is made smooth.

  Since the swing pedal drive type bicycle of the present invention is configured as described above, the following effects can be obtained.

  The swing pedal drive type bicycle of the present invention is a pedal in which a fulcrum is pivotally supported in the middle of a chain stay on a grooved wheel pivotally supported on a crankpin of a crank pivotally supported on both sides of a crankshaft pivotally supported on a bottom bracket. Supports the middle of the lever, and the pedal at the free end of the pedal lever is operated to raise and lower the left and right pedals alternately by stepping and pulling, and the pedal lever swings up and down to crank mechanism or crankshaft The rear wheel can be driven through the transmission means.

  In the swing pedal drive type bicycle of the present invention, a small-diameter crank is directly attached to both sides of an existing crankshaft of an ordinary bicycle bottom bracket, and the pedal lever is pivotally supported by a bracket provided at a chain stay. It can be easily refurbished using a normal bicycle.

  In a normal pedal stroke of a bicycle, the pedal is depressed, that is, the pedal is depressed at a pedal rotation angle of about 120 degrees from the upper front to the lower as a stepping leg operation, and an effective crank driving force equivalent to 50% of the operation power is obtained. However, the remaining rotational operation equivalent to 240 degrees includes rearward pulling, pulling up, and forward pushing strokes, which is a so-called pulling leg operation, and 50% of the operating power is consumed, causing a reduction in crankshaft drive efficiency. However, in the present invention, the pulling leg side movement is halved as a reverse movement with a rotation angle of about 120 degrees of the stepping leg movement with respect to the rotation movement equivalent to 240 degrees of the normal bicycle's pulling stroke. The stepping leg operation and the pulling leg side operation are simply swinging up and down the pedal lever, and the operation power can be reduced and the crankshaft or rear wheel drive efficiency can be improved.

  Since the halfway of the pedal lever is supported by the grooved wheel supported by the crankpin, and the operating resistance between the pedal lever and the grooved wheel is a rolling frictional resistance, the resistance loss can be minimized.

  In the case where a mountain-shaped bent slope is formed on the lower edge near the fulcrum from near the center of the pedal lever, the pedal lever, groove wheel and crank are actuated by the pedal on the main drive side to drive the crankshaft Then, the lower edge of the pedal lever on the pulling leg side is supported by the groove of the opposite side crank, the support position shifts to the fulcrum position side, and the upward swinging displacement tendency of the lever rises rapidly, so-called rapid return swing When a tendency is present, the grooved wheel moves to the section of the curved slope, thereby reducing the swing displacement and suppressing the rapid return swing tendency, and swinging the pulling leg side pedal and pedal lever as the driven side The operation can be facilitated.

  In the swing pedal drive type bicycle of the present invention, the pedal movement path between the stepping leg side and the pulling leg side is a simple up-and-down reciprocating movement having a relatively large diameter arc, and the two thighs used for the pulling leg movement It can be applied to the functional recovery or training of muscles around the legs including muscles, iliopsoas muscle, etc.

  As an embodiment of the invention, the middle of a pedal lever that pivotally supports a fulcrum position in the middle of a chain stay is supported around a crank pin of a small-diameter crank that is pivotally supported on both sides of the bottom bracket in front of the chain stay. A pedal is installed horizontally at the free end of the lever, and the left and right pedals are alternately raised and lowered by the stepping and pulling leg movements, and the pedal lever is swung up and down to drive the crank mechanism. A rocking pedal drive type bicycle having a simple configuration capable of driving a wheel is provided.

  As shown in FIGS. 1 to 4, a small-diameter crank (on the left and right ends of the crankshaft (4) pivotally supported on the bottom bracket (3) at the front of the chain stay (2, 2) on both sides of the rear wheel (1) 5, 5) are attached to each other, the groove pin (52, 52) is supported on the crank pin (51, 51) of the crank, and the support is installed in the middle of the chain stay (2, 2). (61, 61) is pivotally supported at the fulcrum of the pedal lever (6, 6), the lower edge of the pedal lever is supported by the grooved wheel, and the pedal (7, 7) is mounted on the free end of the lever. The left and right pedals are alternately raised and lowered by stepping and pulling leg movements, and the pedal levers (6, 6) are swung up and down to drive the crank mechanism or crankshaft (4). The rear wheel (1) can be driven through the transmission means.

  3 and 5, the pedal lever (6) is formed by forming a mountain-shaped bent slope (a) at the lower edge between the central position and the fulcrum position. The pedal lever (6), the groove wheel (52) and the crank (5) are actuated by the side stepping leg pedal (7) to drive the crankshaft (4) and pulled to the groove wheel (52) of the opposite crank. When the lower edge of the pedal lever (6) on the leg side is supported and the support position shifts to the fulcrum position side, the upward swing displacement tendency of the lever, that is, the so-called quick return swing tendency, By introducing the car into the section of the curved slope (a), the swing displacement is reduced to suppress the rapid return swing tendency, and the operation of the pulling leg side pedal and the pedal lever is smoothed.

  The operation of the configuration according to the second embodiment is as follows. That is, FIG. 5 schematically shows the operation progressing process of the main components. At the initial position of the process (1), the right pedal (7R) on the stepping leg side is at the highest position of the pedal stroke (S), The left pedal (7L) on the leg side is at the lowest position in the same stroke, and in step (2), when the right pedal (7R) on the stepped leg side is depressed, the bent pedal lever (6a) The grooved wheel (52) is pushed, the crank (5) is driven to drive the crank mechanism or the crankshaft (4), and the opposite grooved wheel (52) is driven. Oscillation is started while supporting the bent pedal lever (6a) of the pedal (7L), and the support position of the grooved wheel is shifted from the lowest position of the pedal stroke (S) to the bent slope (a) introduction part, At this time, the grooved wheel (52) and the straight plate without the bent slope (a) indicated by the phantom line in the figure The swing mechanism with the pedal lever (6b) corresponds to a so-called quick return motions mechanism with a crank and a swing lever, and the support position of the groove wheel moves toward the fulcrum side of the straight pedal lever (6b). When approaching, it shows a tendency of the rocking displacement angle to increase rapidly, that is, a so-called rapid return rocking tendency, but the bent pedal lever (6a) supports the introduction part of the slope (a), and the straight type The pedal lever (6b) is shifted in swinging displacement, that is, a swinging phase difference (δ) is generated, and a fast-returning swing suppressing effect is generated. The suppressing effect is obtained in steps (3) to (6). In process (3), the groove wheel (52) is in the middle of the curved slope (a), and in process (4), the groove wheel (52) is at the rear end of the curved slope (a). In process (5), the ditch wheel moves to the front position from the rear end of the slope, and in process (6) Thus, the groove wheel (52) supports the front end of the slope, and the rocking phase difference (δ) becomes maximum in the processes (4) to (5), and the rocking phase difference is gradually decreased in the process (6). Therefore, the swinging movement of the pedal and the pedal lever in the pulling leg side stroke is smoothed by the effect of suppressing the rapid return swinging in the processes (2) to (6) on the pulling leg side, and also in the pedal stroke of a normal bicycle. Unlike the pedal rotation, the pedal and pedal lever move only in a simple up-and-down direction. In the process (7), the groove escapes the bending slope of the pedal lever (6a) on the pulling leg side, and the left pedal (7L) and the pedal lever (6a) on the pulling leg side of the pedal stroke ( S) and reach the top The right pedal (7R) on the side reaches the bottom of the same stroke, both pedals are in the initial position (1) and left and right handed, so the left and right pedals are alternately stepped up and down, The crank mechanism or the crankshaft (4) is driven by repeating the side stroke and the pull leg side stroke, and the rear wheel is transmitted via the transmission means, that is, the chain wheel (8), the chain (9), and the rear sprocket (10). (1) is driven, and the effect of improving the driving speed and efficiency of the entire stroke can be obtained.

  It is an elevation view which shows the use condition seen from the side of this invention rocking pedal drive type bicycle.   It is a top view of this invention rocking pedal drive type bicycle.   It is an elevation view of the principal part details which look at this invention rocking pedal drive type bicycle from the side.   It is sectional drawing which shows the principal part detail in AA of FIG.   It is a flowchart which shows typically the operation | movement process of this invention rocking pedal drive type bicycle.

Explanation of symbols

1 Rear wheel 2 Chain stay 3 Bottom bracket 4 Crankshaft 5 Crank 51 Crank pin 52 Groove wheel 6 Pedal lever a Bending slope (of the pedal lever)
6a Bending pedal lever (with bending slope)
6b Straight pedal lever (no bending slope, imaginary line shown)
δ Oscillation phase difference (deviation of oscillation displacement at the same operating position of 6b and 6a and the groove wheel)
61 Support 7 Pedal 7R Right pedal 7L Left pedal 8 Chain wheel 9 Chain 10 Rear sprocket S Pedal stroke m Rider

Claims (2)

  A small-diameter crank (5, 5) is attached oppositely to the left and right ends of the crankshaft (4) pivotally supported by the chain bracket (2, 2) on the front bracket (3) on both sides of the rear wheel (1) The crank pin (51, 51) of the crank is supported by the grooved wheel (52, 52), and the support (61, 61) installed in the middle of the chain stay (2, 2) is connected to the pedal lever (61, 61). 6, 6) is pivotally supported, the lower edge of the pedal lever is supported by the grooved wheel, and the pedal (7, 7) is installed horizontally at the free end of the lever. The left and right pedals are alternately raised and lowered by the pulling leg operation, the pedal levers (6, 6) are swung up and down to drive the crank mechanism or the crankshaft (4), and the rear wheel (1) through the transmission means. A swing pedal-driven bicycle characterized in that it can be driven.   The pedal lever (6) is formed with a mountain-shaped bent slope (a) at the lower edge between the central position and the fulcrum position. The pedal lever (6) and the groove wheel are formed by the pedal (7) on the stepped leg side. (52) and the crank (5) are actuated to drive the crankshaft (4), and the lower edge of the pedal lever (6) on the pulling leg side is supported by the grooved wheel (52) of the opposite side crank. When the lever moves to the fulcrum side, and when the upward swinging displacement of the lever tends to increase rapidly, that is, when it tends to swing quickly, the grooved displacement is reduced by introducing the grooved wheel into the section of the curved slope. The swing pedal-driven bicycle according to claim 1, wherein the swinging tendency of the pedal and the pedal lever is smoothed by suppressing the tendency to swing quickly.

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