Variable Patents (Class 74/594.3)
  • Patent number: 10800481
    Abstract: The present patent application describes a modular crankset for bicycles. The described modular crankset is useful for users, since it solves issues related to the speed of replacement of elements, the easiness of the replacement procedures and lowers the weight of the set without compromising the consistency and rigidity of the set. The current technology is applicable to any bicycle available in the market, including electrical bicycles, and it is especially interesting for competition bicycles, wherein the replacement of the constituent elements of the crankset should be made as quickly as possible.
    Type: Grant
    Filed: February 3, 2017
    Date of Patent: October 13, 2020
    Assignee: MIRANDA & IRMAO, LDa
    Inventor: Joao Filipe Tavares Miranda
  • Patent number: 9427620
    Abstract: An exercise machine for exercising at least one limb, in particular for use in rehabilitation and/or fitness, with a supporting frame and a generator of circular motion, which can be rotated on a rotary shaft associated with the supporting frame, and a limb support for resting and/or supporting at least one limb. A rotational shaft arranged radially off-set with respect to the rotary shaft of the generator of circular motion is associated with the generator of circular motion to rotatably mount a rotator. The limb support is associated with the rotator, preferably eccentric to the rotational shaft. The trajectory of the limb support is elliptical, the ellipse being formed by an overlapping of the circular motions of the generator of circular motion and the rotator.
    Type: Grant
    Filed: May 12, 2014
    Date of Patent: August 30, 2016
    Assignee: medica-Medizintechnik GmbH
    Inventors: Jakob Oblak, Zlatko Matjacic
  • Patent number: 9327162
    Abstract: An exercise apparatus includes a main device having a handle member and a seat member, the main device having a driver set rotatably assembled, the driver set having a first driver member, the first driver member having a plurality of first driver units, the driver set having two pedals assembled at two sides thereof, the main device having a wheel member rotatably assembled thereon, a second driver member assembled at an axle of the wheel member, the second driver member having a plurality of second driver units, a first connecting member connecting the first driver member and the second driver member so as to drive the wheel member to rotate, the first connecting member mounted around one first driver unit and one second driver unit, a resistance device assembled on the main device, the resistance device configured to create a resistance force to the wheel member.
    Type: Grant
    Filed: April 8, 2014
    Date of Patent: May 3, 2016
    Assignee: Giant Lion Co., Ltd.
    Inventor: Chin-Lin Huang
  • Publication number: 20140216205
    Abstract: The invention is a crank assembly designed to allow the length of the crank arms to vary throughout the revolution of the crank. A spindle is attached to the bottom bracket assembly of a bicycle. The spindle is comprised of a cylindrical shaft with a mating feature at each end. A first crank arm assembly is attached to the spindle's left mating feature. The left crank arm assembly includes the crank arm, slider assembly, bearing, track, and pedal. Next, a second crank arm assembly is attached to the spindle's right mating feature. The right crank arm assembly includes the chain ring base, bearing, track, crank arm, slider assembly, pedal, and chain ring. Finally, the trajectory of the pedals in this invention follows a unique curve designed to allow the optimum expansion and contraction of the crank arms coinciding with the optimum amount of torque and angular speed.
    Type: Application
    Filed: September 16, 2013
    Publication date: August 7, 2014
    Inventor: Sergio Landau
  • Patent number: 8561498
    Abstract: An eccentric bottom bracket for a bicycle. The eccentric bottom bracket includes opposing first and second members. The first member and the second member each include a body and a flange. Each body is sized and shaped to penetrate an opening of a bottom bracket shell of a bicycle. Each flange is sized and shaped to prevent complete admittance of the member into the bottom bracket shell. Each body also has a bearing guide with an axis that is parallel to but offset from a center axis of the bottom bracket shell when that body is fit into the bottom bracket shell. The eccentric bottom bracket also includes a tightening assembly for selectively applying a compressive force between the body of the first member and the body of the second member. The compressive force secures the first member and the second member to the bottom bracket shell.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: October 22, 2013
    Assignee: Niner, Inc.
    Inventor: Steve Domahidy
  • Patent number: 8328216
    Abstract: The present invention relates to a mechanical element, and more particularly, to a crank connected to a bicycle pedal or a handle for rotating a rotary body and to a bicycle using the same. The present invention uses a cylindrical cam, an end cam, or a swash plate cam, and the shafts of these cams and a shaft of a pedal or a handle for applying force are equipped with a miter gear (a bevel gear the number of teeth of which is 1:1 and the shaft angle of which is 90 degrees), such that the crank retracts/extends one time per one rotation of the pedal or the handle.
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: December 11, 2012
    Inventor: Keun Hyoung Lee
  • Patent number: 8146938
    Abstract: A pedalling method and device for a user in standing position. The device includes a drive shaft whereof the rotation about its axis is coupled with the rotation of two right and left pedals. The pedals are mutually assembled via a plurality of cranks, connecting rods, and pivots such that: the pedals can travel freely along a circular path, for a constant rotational speed of the shaft, the speeds of the pedals are recurrent at equal time intervals but out of phase, minimal at lower dead center, maximal at upper dead center, and when the pedals are simultaneously at a common height lower than that of the center of the trajectory, the speeds of the pedals are equal. The vertical oscillation of the center of gravity of a user in standing position is reduced compared to a conventional pedal assembly.
    Type: Grant
    Filed: August 29, 2006
    Date of Patent: April 3, 2012
    Assignee: Dreamslide
    Inventor: Jean-Marc Gobillard
  • Patent number: 8117944
    Abstract: In accordance with one aspect of the present invention, a pedal apparatus is provided. The pedal apparatus comprises a pedal member including a seat and an axle configured to cooperate with the seat to support the pedal member. The pedal apparatus is configured such that a rotation of the pedal member with respect to the axle causes translation of the pedal member with respect to the axle.
    Type: Grant
    Filed: January 9, 2008
    Date of Patent: February 21, 2012
    Inventor: Nikola Stevovich
  • Patent number: 8025304
    Abstract: An improved power transfer mechanism for use on a human-powered machine, adapted to be drivingly connected to a power take-off device of said machines, includes: a housing adapted in use, to be disposed within a frame of said human-powered machine; at least one crankshaft adapted to be disposed within said housing; respective left-side and right-side crank arms each adapted to be drivingly associated with an end of said at least one crankshaft; and drive transfer means adapted to co-operate with said at least one crankshaft and each associated crank arm, the arrangement being such that a first member of the group comprising and left-side and right-side crank arms and said power take-off device is adapted to be attached to said at least one crankshaft, such that each of the second and third of said members is adapted to be rotatable relative to said first of said members, and each other, only to a limited and controlled degree, whilst not be movable axially or in a longitudinal direction relative to said at le
    Type: Grant
    Filed: April 4, 2007
    Date of Patent: September 27, 2011
    Inventor: Robert M. Smith
  • Publication number: 20110203408
    Abstract: A releasable pedal mounting system having a pedal adapter that is adapted to engage a pedal and a pedal support member that is engageable to an apparatus, the support member including pedal adapter retention means that is adapted to allow mounting of the pedal adapter to the pedal support member when the pedal adapter retention means is in a first position and slideable engagement of the pedal adapter retention means to the pedal adapter retention region when in a second position, whereby the pedal adapter is secured to the pedal support member in a locked position.
    Type: Application
    Filed: February 18, 2011
    Publication date: August 25, 2011
    Inventor: Douglas M. White
  • Publication number: 20100251850
    Abstract: A crank transmission mechanism includes a crank unit having a rail portion connected to an end thereof and a guide member is connected with a shaft which is connected with a disk. The rail portion is movably engaged with the guide member. A transmission unit is connected between the crank unit and the disk, the rail portion and the guide member are connected to the transmission unit. The transmission unit is adjusted according to the relative position between the rail portion of the crank unit and the guide member. The crank transmission mechanism is compact and the torque can be adjusted by slowly adjusting the length of the crank unit. The crank transmission mechanism can be used to bicycles, tricycles and elliptical exercising machine.
    Type: Application
    Filed: June 30, 2008
    Publication date: October 7, 2010
    Inventor: Cheng Bin WANG
  • Patent number: 7594879
    Abstract: A rotary rehabilitation apparatus is presented for rehabilitation of a person's extremity, including the joints and assorted muscles, tendons, ligaments, that can be tailored to the person's needs based upon their physical size, type of injury, and plan for recovery. The apparatus facilitates the adjustment of the range of motion of the user's extremity in a cycling action by offsetting a moveable lever from a fixed lever at a plurality of angles. As the user's extremity moves in a circular path, the extremity engages in extension and flexion to cause movements in the articulations formed at the user's joints.
    Type: Grant
    Filed: November 23, 2004
    Date of Patent: September 29, 2009
    Assignee: Brainchild LLC
    Inventor: Kenneth W. Johnson
  • Publication number: 20090183592
    Abstract: A configurable chain drive transmission, which is propelled by two bent, prolonged, and extendable levers, that can be attached on to an existing chain drive transmission found on bicycles, wheelchairs, carts, and other forms of transportation to increase its output and usefulness.
    Type: Application
    Filed: November 18, 2008
    Publication date: July 23, 2009
    Inventor: Stefan Zelinka
  • Patent number: 7507188
    Abstract: A rehab cycle crank having a pedal assembly, center assembly, anchor assembly, two rods, and pneumatic cylinder; wherein the pedal assembly includes a pedal plate, pedal base, and housing; wherein the center assembly includes a primary member and a secondary member; wherein each rod includes a first end and a second end; wherein the pneumatic cylinder includes a first end and a second end; wherein the housing of the pedal assembly is connected to the first end of each rod; wherein the anchor assembly is connected to the second end of at least one of the rods and the second end of the pneumatic cylinder; wherein the rods extend slidably through the primary member of the center assembly; wherein the primary member is attached to the secondary member by a central hub; wherein the secondary member comprises a crank arm into which the crank spindle of a cycle is inserted.
    Type: Grant
    Filed: April 20, 2006
    Date of Patent: March 24, 2009
    Inventor: Christopher G. Nurre
  • Patent number: 7350796
    Abstract: A crank apparatus includes a driven member rotatably mounted to a machine, and a crank arm attached at an inner end thereof to the driven member at a rotational axis of the driven member such that the driven member and crank arm rotate together. An axle is slidably mounted to the crank arm such that the axle is maintained substantially parallel to the rotational axis of the driven member as it slides from an inner point on the crank arm, to an outer point on the crank arm, and a bias element is arranged to exert a force on the axle toward the rotational axis of the driven member.
    Type: Grant
    Filed: July 5, 2005
    Date of Patent: April 1, 2008
    Inventor: Nenad Misevski
  • Patent number: 7226394
    Abstract: A rotary rehabilitation apparatus for rehabilitation of a person's extremity, including the joints and assorted muscles, tendons, ligaments, that can be tailored to the person's needs based upon their physical size, type of injury, and plan for recovery. The apparatus facilitates the adjustment of the range of motion of the user's extremity in a cycling action by offsetting a moveable lever from a fixed lever at a plurality of angles. As the user's extremity moves in a circular path, the extremity engages in extension and flexion to cause movements in the articulations formed at the user's joints.
    Type: Grant
    Filed: October 16, 2003
    Date of Patent: June 5, 2007
    Inventor: Kenneth W. Johnson
  • Patent number: 7093516
    Abstract: This invention is a bicycle crank and pedal assembly with a self-extending and retracting crank arm. The assembly only has three one-piece components that move relative to each other, if the bearings used in friction reduction are ignored. It is simple in design, compact in size and very effective in delivering the benefits of a self-extending and retracting crank arm. In particular, the assembly has (a) the maximum arm length for over 90 degrees of arm directions in the power down stroke and (b) the minimum arm length for close to 90 degrees of arm directions in the return up stroke.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: August 22, 2006
    Inventor: Eric Kam-Ling Hung
  • Patent number: 7017444
    Abstract: A transmission for a bicycle pedal has a fixed axle with an end operatively connected to a wheel of the bicycle and a guide axle connected to the fixed axle to form a crank. A bicycle pedal is rotatably mounted on a slider which is movably mounted on a guide portion of the guide rod for translation therealong. The ration of gyration of the pedal can be varied by sliding the pedal along the guide axle and/or telescoping the guide axle relative to the fixed axle. The slider and mounted pedal can be rotated toward the bicycle frame for compact storage.
    Type: Grant
    Filed: April 1, 2003
    Date of Patent: March 28, 2006
    Inventor: Jun-Suck Kim
  • Patent number: 7007570
    Abstract: A bicycle crank mechanism comprises a main crank, a follower crank, and a connecting lever disposed between free ends of the main and follower cranks. A second fixed fulcrum shaft of the follower crank is arranged obliquely upwardly and backwardly of a first fixed fulcrum shaft of the main crank, the follower crank extending downward beyond a line connecting the first and second fixed fulcrum shafts from the second fixed fulcrum shaft such that the second free fulcrum shaft is swung below the line connecting the first and second fixed fulcrum shafts. A pedal is attached to a projection end of the lever and arranged in the vicinity of the free end of the main crank, the pedal being rotated along a non-circular track passing between the first and second fixed fulcrum shafts, and the first fixed fulcrum shaft being located at an internal area of the track.
    Type: Grant
    Filed: March 26, 2003
    Date of Patent: March 7, 2006
    Inventor: Naotaka Gayoh
  • Patent number: 6895834
    Abstract: A crank arm of a bicycle having an effective crank arm length that can be selectively adjusted for increasing the comfort and performance of the rider. The crank arm includes a crank arm member rotatably connected about a crank arm member rotational axis to a base member. The base member includes a spindle bore defining a spindle rotational axis, which is eccentric with respect to the crank arm member rotational axis. The opposite end of the crank arm member includes a pedal bore defining a pedal rotational axis. The crank arm further includes a fastener to selectively couple the base member to the crank arm member for rotation therewith.
    Type: Grant
    Filed: October 3, 2003
    Date of Patent: May 24, 2005
    Assignee: Racer-Mate, Inc.
    Inventor: Wilfried Baatz
  • Patent number: 6837822
    Abstract: An improved structure of a gear cluster for a bicycle having a crankset mounted with a crankshaft provided with a planetary gear module, wherein the planetary gear module includes a big wheel and a small wheel section and the planetary gear module drives an inner gear module mounted onto a gear plate, One lateral side of the crankshaft is provided with a driving structure including a second driving wheel and a third driving wheel engageable with the big and small wheels and the crankshaft is provided with a regulating structure for the positioning of the driving structure. The regulating structure includes two sets of a second and a third ratchet blocks for the positioning or free rotating of the second and the third driving wheels. The regulating structure is provided with a triggering structure to act on different ratchet block.
    Type: Grant
    Filed: March 10, 2003
    Date of Patent: January 4, 2005
    Inventor: Chin Fu Wu
  • Patent number: 6820517
    Abstract: The pedal crank of the present invention includes a cam having a channel therein, a hub fixed to the shaft of the exercise machine, an arm operable with a cam follower and a pair of rods. The arm includes the pedal or other force applying member of the exercise machine, and the cam follower extends into the channel of the cam. The rods extend from the hub to the arm such that the distance between the hub and the arm may vary according to the length of the rods. The shaft of the exercise machine extends through an eccentric hole in the cam. A pair of channels are machined in either the hub or the arm in which the rods reciprocate. The pedal crank is capable of extension to a maximum length of the rods which corresponds to the range of maximum biomechanical force applied to the leg of the user to the pedal or other force applying member of the exercise machine. The pedal crank then retracts in length on rotation to a point corresponding to the minimum biomechanical force.
    Type: Grant
    Filed: November 4, 2002
    Date of Patent: November 23, 2004
    Assignee: Scifit Systems, Inc.
    Inventor: Michael Kent Farney
  • Publication number: 20040194572
    Abstract: A transmission for a bicycle pedal has a fixed axle with an end operatively connected to a wheel of the bicycle and a guide axle connected to the fixed axle to form a crank. A bicycle pedal is rotatably mounted on a slider which is movably mounted on a guide portion of the guide rod for translation therealong. The ration of gyration of the pedal can be varied by sliding the pedal along the guide axle and/or telescoping the guide axle relative to the fixed axle. The slider and mounted pedal can be rotated toward the bicycle frame for compact storage.
    Type: Application
    Filed: April 1, 2003
    Publication date: October 7, 2004
    Inventor: Jun-Suck Kim
  • Patent number: 6796200
    Abstract: A bicycle transmission has a plurality of cone gears with multiple gear surfaces and a corresponding plurality of ratio-change assemblies for selecting one of the gear surfaces of each cone gear. One cone gear provides reductions of the input rotary speed while the other cone gears provide increases in the input rotary speed. The ratio-change assemblies include apparatus for moving its gear surface both vertically and horizontally. The transmission includes a telescopic pedal arm assembly for input power and torque. The telescopic pedal arm is driven between an extended position and a retracted position during each revolution so that the available torque increases in conjunction with available leg power.
    Type: Grant
    Filed: June 18, 2002
    Date of Patent: September 28, 2004
    Inventor: John Robert Kelly
  • Publication number: 20040112170
    Abstract: To reduce the load alternately imposed on the rider's legs when the pedals are stepped and to use the muscle of the entire legs in a well balanced manner, thereby naturally returning the pedals to the initial position of the stepping operation without forming an unnatural bending state of each leg at the returning track of the pedal.
    Type: Application
    Filed: March 26, 2003
    Publication date: June 17, 2004
    Inventor: Naotaka Gayoh
  • Publication number: 20040103747
    Abstract: This invention is a bicycle crank and pedal assembly with a self-extending and retracting crank arm. The assembly only has three one-piece components that move relative to each other, if the bearings used in friction reduction are ignored. It is simple, compact and very effective in delivering the benefits of a self-extending and retracting crank arm. In particular, the assembly has (a) the maximum arm length for over 90 degrees of arm positions in the power down stroke and (b) the minimum arm length for close to 90 degrees of arm positions in the return up stroke.
    Type: Application
    Filed: July 14, 2003
    Publication date: June 3, 2004
    Inventor: Eric Kam-Ling Hung
  • Publication number: 20040045401
    Abstract: The invention relates to a pedaling system using independent crank arms, a power plate—which rotates about an axis at a distance from and parallel to the axis of the bottom bracket—that is mounted by means of bearings on an eccentric support that can be fixed to the casing of the bottom bracket, and a transfer arm which is integral with the crank arm opposite to the side of the plates by means of an axle of the bottom bracket. Torque is thus transmitted from the crank arm on the side of the plates and from the transfer arm by means of two pushers that are connected to points diametrically opposite to the plate. During pedaling, relative development gradually increases as each pedal descends and the bicycle gains inertia. When the pedal is approaching the end of its descending phase and the tangential component of the force being applied decreases, the torque load decreases more rapidly.
    Type: Application
    Filed: August 11, 2003
    Publication date: March 11, 2004
    Inventor: Pablo Vergara Carrasco
  • Patent number: 6640662
    Abstract: A variable length crank arm assembly (10) is disclosed which is mounted to a bicycle (11). The crank arm assembly (10) has a pair of oppositely disposed crank arms (25) each having a boss (26) from which extends a forked, crank arm member (27). Each crank arm member (27) has a first portion (28) that extends to a second portion (29). The second portion (29) has a proximal stop (31) and a distal stop plate (32). The crank arm assembly (10) also includes a slide (34) slideably mounted upon the second portion (29). A pair of proximal springs (37) are mounted upon the arm member second portion (29) which bias the slide (34) toward distal stop plate (32). A pair of distal springs (38) are mounted upon the second portion (29) which bias the slide (34) toward the proximal stops (31). A pedal assembly (41) is rotatably mounted to the slide (34). The pedal assembly (41) includes a shaft (42) extending from slide (34) and a conventional pedal (43) rotatably mounted to shaft (42).
    Type: Grant
    Filed: May 9, 2002
    Date of Patent: November 4, 2003
    Inventor: Craig Baxter
  • Patent number: 6607326
    Abstract: A planetary sphere/ring gear, comprising a sphere and a ring, which are interconnected by a ball and a socket. The ball is located on the edge of a circular opening in the ring and the socket is located on the body of the sphere. Used in conjunction with this planetary sphere/ring gear is a pedal-powered three or more wheeled vehicle which comprises a chain wheel, and pedals which swivel and which swing on a cradle. An operator's seat also swings on said cradle. Even though traversing across slopes, the chain wheel, pedals and seat are in a straight-with-the-world position, which is a natural and comfortable position for pedaling. The planetary sphere/ring gear is needed in the vehicle to allow the toothed ring, with a drive chain around it, to change its axis to line up with the drive wheel, as it swivels and swings.
    Type: Grant
    Filed: May 7, 2002
    Date of Patent: August 19, 2003
    Inventor: Lyle J. Christiansen
  • Patent number: 6589139
    Abstract: A cycle (or an adaptation for a cycle) comprises a primary crank arranged for rotation about a first axis, a secondary crank, and connection means for selective connection of the secondary crank to the primary crank at a selected one of a plurality of positions on both the primary crank and the secondary crank. A pedal is mounted on the secondary crank, and selectively operable means is provided for either permitting or preventing rotation of the secondary crank relative to the primary crank, in dependence of the nature of the disabilities or injuries of the user of the cycle.
    Type: Grant
    Filed: March 7, 2000
    Date of Patent: July 8, 2003
    Inventor: Paul John Butterworth
  • Patent number: 6508146
    Abstract: A pedal driving mechanism for a bicycle which contains structurally improved pedal arms on which pedals are installed to increase the rotary radius of the pedals during the running of the bicycle to obtain optimum driving energy with minimum physical energy consumption, wherein the structure of pedaling mechanism defines a joining line formed by the tooth-coupling of a fixing gear and a rotary gear with the axle line of a driving arm at a right angle, and the trace of the linkage formed by a connection arm and a connection link is set to move in a spiral motion forced to rotate with respect to the center of the fixing gear.
    Type: Grant
    Filed: June 5, 2001
    Date of Patent: January 21, 2003
    Inventors: Byung-Nam Kang, Jong-Suk Kim, Hye-Jong Park
  • Patent number: 6487933
    Abstract: The unit comprises two variable-length pedal cranks (20) having a common rotation pin (21) of transverse axis (A), and a mechanism (34, 35, 36) for varying the length of the two pedal cranks (20) on the basis of their angular position; the position of the axes of the pedals (25) in the vertical plane of projection defines, as the angular position of the pedal cranks (20) varies, an endless closed curve (F) about a reference axis (R) which is displaced by an angle of about 15 degrees forwards from the axis (N) passing through the center of the seat (11) of the bicycle and intersecting the axis (A) of the pin (21).
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: December 3, 2002
    Assignee: Sasti S.R.L.
    Inventors: Giacomo Orioli, Zeno Zani
  • Patent number: 6474193
    Abstract: The pedal crank of the present invention includes a cam having a channel therein, a hub fixed to the shaft of the exercise machine, an arm operable with a cam follower and a pair of rods. The arm includes the pedal or other force applying member of the exercise machine, and the cam follower extends into the channel of the cam. The rods extend from the hub to the arm such that the distance between the hub and the arm may vary according to the length of the rods. The shaft of the exercise machine extends through an eccentric hole in the cam. A pair of channels are machined in either the hub or the arm in which the rods reciprocate. The pedal crank is capable of extension to a maximum length of the rods which corresponds to the range of maximum biomechanical force applied to the leg of the user to the pedal or other force applying member of the exercise machine. The pedal crank then retracts in length on rotation to a point corresponding to the minimum biomechanical force.
    Type: Grant
    Filed: March 24, 2000
    Date of Patent: November 5, 2002
    Assignee: Sinties Scientific, Inc.
    Inventor: Michael Kent Farney
  • Publication number: 20020017158
    Abstract: A variable drive mechanism for bicycle comprising a pair of input torque crank arms supported for independent rotation about a first axis and operatively connected to an output torque member rotating about a second axis. The rotary angular location of the two axes is adjustable and lockable in order to provide smoother pedaling motion or to eliminate the top dead center as is preferred with mountain bikes. With this drive mechanism, a constant speed of the output member will provide the input crank arm with a single variation of speed per revolution.
    Type: Application
    Filed: July 18, 2001
    Publication date: February 14, 2002
    Inventor: Joseph R. Lemmens
  • Patent number: 6341946
    Abstract: A apparatus for gearless shifting, includes at least one crank, and an arm assembly, coupled to the at least one crank, for telescoping to adjust a length of the at least one crank, to selectively and controllably adjust a stroke length of the at least one crank. A pump also is provided including a variable-stroke length apparatus.
    Type: Grant
    Filed: June 14, 1999
    Date of Patent: January 29, 2002
    Assignee: International Business Machines Corporation
    Inventor: John Falk Kelley
  • Publication number: 20010052271
    Abstract: The unit comprises two variable-length pedal cranks (20) having a common rotation pin (21) of transverse axis (A), and means (34, 35, 36) for varying the length of the two pedal cranks (20) on the basis of their angular position; the position of the axes of the pedals (25) in the vertical plane of projection defines, as the angular position of the pedal cranks (20) varies, an endless closed curve (F) about a reference axis (R) which is displaced by an angle of about 15 degrees forwards from the axis (N) passing through the center of the seat (12) of the bicycle and intersecting the axis (A) of the pin (21).
    Type: Application
    Filed: May 25, 2001
    Publication date: December 20, 2001
    Applicant: SASTI S.R.L.
    Inventors: Giacomo Orioli, Zeno Zani
  • Publication number: 20010032525
    Abstract: A bicycle crank assembly comprises pedals, crank arms, an axle and a chainring assembly. The pedals, crank arms, and axle are coupled to the chainring assembly through an elastic element in the form of a U-shaped spring. This elastic coupling allows relative angular rotation between pedals and chainring proportional to the force exerted on the pedals by a bicycle rider. The proportionality constant, or elasticity, is adjustable by repositioning the spring within its supporting structure. The elasticity may be thus adjusted to enable accurate calibration of measurement instrumentation associated with the crank assembly, or for any purpose for which an an adjustable elastic coupling is desirable.
    Type: Application
    Filed: February 1, 2001
    Publication date: October 25, 2001
    Inventor: Terry E. McIlraith
  • Patent number: 6276234
    Abstract: A bicycle crank assembly includes a spindle connection arrangement for connecting a first and second crank arm to a bicycle frame. The first crank arm includes a first portion of the spindle and the second crank arm includes a second portion of the spindle. The first and second spindle portions are connected to one another using two spaced apart bearing surfaces that provide a durable yet easily disassemblable spindle. The crank assembly also includes a removable chain ring and a chain ring adjuster for adjusting the position of the chain ring along the rotational axis of the spindle in order to allow the chain ring to be properly aligned with other components of the bicycle. In one embodiment, the assembly includes variable length crank arms that increase the ground clearance of the crank assembly and improve the leverage provided by the crank assembly during the downward stroke of the crank assembly.
    Type: Grant
    Filed: February 6, 2000
    Date of Patent: August 21, 2001
    Inventor: Jeffery M. Harrington
  • Patent number: 6253639
    Abstract: An apparatus for translating a radial force applied to a crank into additional rotary motion by a crankshaft is described as including a crank mechanically coupled to the crankshaft that is adapted to extend away from the crankshaft and also toward the crankshaft. A spring is used to apply a biasing force to urge the crank toward the crankshaft. According to a first described embodiment, extension of the crank from the crankshaft acts upon flexible chain attached to the crank and to a cam so that extension of the crank causes additional rotation of the cam. The cam is attached to the crankshaft so that the extension of the crank also causes additional rotation by the crankshaft. According to a second embodiment, a pedal carrier arm is disposed at an angle intermediate a pair of members which define a primary crank and is held adjacent to each of a pair of rollers that are attached to the primary crank.
    Type: Grant
    Filed: November 19, 1997
    Date of Patent: July 3, 2001
    Inventor: Ronald Hugh Richardson