Patents by Inventor Dirck T. Hartmann

Dirck T. Hartmann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7823898
    Abstract: The improved chainless drive of the present invention features a four speed planetary transmission housed within the hub of the driving wheel of an utility tricycle, and an vehicle frame which provides two options for delivering power to the transmission. In the first option the drive shaft, which extends out through bearings on the center line of the driving wheel, has a crank arm fixed on each end. A spindle is fixed in the end of each crank arm and a pedal beam is rotatably mounted near its center on each spindle. A cam roller mounted on each pedal beam near its aft end engages a short length of steel track fastened on the sides of a trunk bolted on the at end off the tricycle frame. The cam roller provides a downward force to counter balance the weight of the rider on the cantilevered forward end off the pedal beam increasing the force on the spindle and thus amplifying the torque delivered to the drive shaft.
    Type: Grant
    Filed: April 18, 2008
    Date of Patent: November 2, 2010
    Inventor: Dirck T. Hartmann
  • Publication number: 20090278330
    Abstract: The improved chainless drive of the present invention features a four speed planetary transmission housed within the hub of the driving wheel of a utility tricycle, and a vehicle frame which provides two options for delivering power to the transmission. In the first option the drive shaft, which extends out through bearings on the center line of the driving wheel, has a crank arm fixed on each end. A spindle is fixed in the end of each crank arm and a pedal beam is rotatably mounted near its center on each spindle. A cam roller mounted on each pedal beam near its aft end engages a short length of steel track fastened on the sides of a trunk bolted on the aft end of the tricycle frame. The cam roller provides a downward force to counter balance the weight of the rider on the cantilevered forward end of the pedal beam increasing the force on the spindle and thus amplifying the torque delivered to the drive shaft.
    Type: Application
    Filed: April 18, 2008
    Publication date: November 12, 2009
    Inventor: Dirck T. Hartmann
  • Publication number: 20090039613
    Abstract: An Ellipticycle features a conventional bicycle front wheel assembly which is joined by two parallel lengths of bicycle tubing to a cast aluminum gear case within which a multiple speed transmission is enclosed. A crank shaft extends out through bearings in the left and right side halves of the gear case at its forward end with a crank arm fixed on each end of the crank shaft. A pedal beam is rotatably mounted near its center on a spindle fixed in the end each crank arm. A cam roller bolted on each side of the gear case at its aft end engages a short length of steel angle riveted -on the inside of each pedal beam providing a downward force to counter balance the weight of the rider on the cantilevered -forward portion of the pedal beam. A length of aluminum tubing is bolted on each side of the gear case at its aft end and encloses a drive shaft which passes out through bearings in the gear case.
    Type: Application
    Filed: August 6, 2007
    Publication date: February 12, 2009
    Inventor: Dirck T. Hartmann
  • Patent number: 5560562
    Abstract: The fishing reel features a three speed planetary drive in a gear housing on one side of the reel, and an improved mechanism for drag control in a clutch housing on the other side. The planetary drive uses an axially slidable high speed sun gear which is coupled by a transverse pin to a positioning rod in an axial hole in the reel axle. A compression spring forces the positioning rod to the outboard end of its travel where the reel provides a direct drive. Two conical grooves in the positioning rod are used in conjunction with a pair of steel balls and a spring loaded ball retainer, to trap the positioning rod in one or the other of two inner positions required for intermediate or high speed. The improved mechanism of drag control features a calibration disk; a drag lever with a spring loaded pin mounted near the end of the lever; and a strike ring engaged by the spring loaded pin with conical depressions in the strike ring indicating the lever positions for free spool or strike.
    Type: Grant
    Filed: June 26, 1995
    Date of Patent: October 1, 1996
    Inventor: Dirck T. Hartmann
  • Patent number: 5022478
    Abstract: A power take-off is configured for use on four wheel drive trucks with automatic transmissions and chain driven transfer cases. This power take-off replaces the conventional adapter used between the transmission and the transfer case, and requires no modification of either the transmission or the transfer case. It is driven from the transmission output shaft and can provide power for the operation of an item of auxiliary equipment such as a hydraulic pump or air compressor either with the truck moving, or while the truck is stationary by placing the transfer case in neutral. Since this power take-off requires no modification to the vehicle other than the addition of a shift-wire to a control knob in the cab, it can be readily added to trucks already in use, or offered as a dealer option on new trucks.
    Type: Grant
    Filed: May 1, 1990
    Date of Patent: June 11, 1991
    Inventor: Dirck T. Hartmann
  • Patent number: 4986556
    Abstract: A chainless motocross bicycle features a bicycle frame with no bottom bracket or seat post, a pedal drive shaft located on the axis of the rear wheel, and a single speed planetary transmission located inside the rear wheel hub. The transmission includes a ring gear with an integral extension of the ring gear clamped in the bicycle frame dropout on the right side; multiple planet gears rotatably mounted on a planet gear carrier driven by the pedal drive shaft, with each planet gear in constant mesh with the ring gear and with a sun gear rotatably mounted on the pedal drive shaft; and a conventional one way clutch coupling the sun gear with the wheel hub. The compact nature, low maintenance, and simplicity of this arrangement provides an attractive alternative to chain driven motocross bicycles which are conventionally ridden with the rider standing on the pedals.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: January 22, 1991
    Inventor: Dirck T. Hartmann
  • Patent number: 4955627
    Abstract: A chainless drive for pedal powered tricycles features a pedal drive shaft located on the axis of the driving wheel and a five speed planetary transmission mounted concentric with the drive shaft and housed within the hub of the wheel. The transmission drives the wheel with a torque which is a multiple of the pedal torque for the two lowest speeds, provides a direct drive for the third speed, and drives the wheel at a multiple of the pedal speed for the two highest speeds. When used as a torque multiplier in the two low speeds, the transmission can drive the wheel either forward or in reverse depending on the direction the pedals are rotated, but permits coasting with the pedals stopped in speeds three, four, and five. A tricycle using this invention with a bin or flatbed should be useful in the factory or on the farm for the transport of parts or produce, or useful as a two passenger taxi with a seat assembly.
    Type: Grant
    Filed: June 9, 1989
    Date of Patent: September 11, 1990
    Inventor: Dirck T. Hartmann
  • Patent number: 4936597
    Abstract: An enclosed multiple speed drive for a tandem bicycle locates the pedal drive shaft for the rear rider on the axis of the rear wheel. The drive features a chain case which replaces the chain stay on the right side of the bicycle and an improved ten speed planetary transmission housed within a gear case inside the rear wheel hub. The chain case is press fit on a steel tube rotatably mounted in the bottom bracket, and a chain case cover on the right side, and a sun gear carrier on the left side, are clamped in the rear dropouts with over center quick releases. To change the rear tire, the chain case cover and the sun gear carrier are released from the dropouts and the chain case is rotated about the axis of the bottom bracket to swing the wheel clear of the frame. The tire can then be peeled off the rim from the left side and replaced without removing the wheel from the gear case or disturbing any of the drive train components.
    Type: Grant
    Filed: April 21, 1989
    Date of Patent: June 26, 1990
    Inventor: Dirck T. Hartmann
  • Patent number: 4881750
    Abstract: The headset of a conventional All Terrain Bicycle is modified to permit the load supported by the front wheel to be transferred to the bicycle frame through a column of compressed air to minimize the shock and vibration to the rider when riding over rough ground. A valve matching those in the bicycle tires is located on the centerline of the steering axis above the handle bar stem and permits the compressed air pressure to be adjusted for different rider weights through use of a conventional bicycle pump. The typical air pressure required is less than the tire pressure. This IMPROVED ATB SHOCK ABSORBER includes provisions for hydraulically damping the air spring motion. The shock absorber design should permit hard use for long periods without maintenance.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: November 21, 1989
    Inventor: Dirck T. Hartmann
  • Patent number: 4842291
    Abstract: An enclosed drive for a low maintenance bicycle features a chain case which replaces the conventional chain stay on the right side of the bicycle, and an improved nine speed planetary transmission housed within a gear case inside the rear wheel hub. The chain case is press fit on a steel tube rotatably mounted in the bottom bracket, and the rear spindle is clamped in the rear dropouts with over center quick disconnects. To change the rear tire, the rear spindle is released and the chain case is rotated about the axis of the bottom bracket to swing the rear wheel clear of the frame. The wheel, which is attached to the gear case with four bolts, can then be removed from the left side without disturbing or exposing any of the drive train components.
    Type: Grant
    Filed: July 22, 1987
    Date of Patent: June 27, 1989
    Inventor: Dirck T. Hartmann
  • Patent number: 4826190
    Abstract: A pedal powered recumbent tricycle with a fully enclosed drive features an extruded aluminum frame within which the brake cables, steering linkage, and a seventeen speed planetary transmission are housed. Power from a pedal crank assembly is delivered to the transmission by a conventional drive chain and pair of sprockets inside a sealed cover on the right side of the frame. Power is delivered from the transmission to the rear axles by a second drive chain and pair of sprockets inside a sealed cover on the left side of the frame. A one way clutch on the inboard end of each axle provides for differential rear wheel speeds on turns, along with positive dual wheel traction.
    Type: Grant
    Filed: February 18, 1988
    Date of Patent: May 2, 1989
    Inventor: Dirck T. Hartmann
  • Patent number: 4815763
    Abstract: The headset of a conventional mountain bicycle is modified to permit the load supported by the front wheel to be transferred to the bicycle frame through a column of compressed air to minimize shock and vibration to the rider when riding over rough ground. A valve matching those in the mountain bicycle tires is located on the steering axis above the handle bar stem and permits the compressed air pressure to be adjusted for different rider weights through use of a conventional bicycle pump. The typical air pressure required with the shock absorber unloaded is less than the tire pressure. The shock absorber design should permit hard use for long periods without maintenance.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: March 28, 1989
    Inventor: Dirck T. Hartmann
  • Patent number: 4770433
    Abstract: An enclosed drive for a mountain bicycle features a chain case which replaces the conventional chain stay on the right side of the bicycle coupled with an improved twelve speed transmission using four countershafts, which is housed in a gear case inside the rear wheel hub. The gear case is bolted to a cylindrical extension of the chain case which mounts the rear wheel bearing on the right side. The chain case is press fit on a steel tube rotatably mounted in the bottom bracket, and the chain case cover is a close shear fit on the rear spindle which is clamped with over center quick disconnects in dropouts at the lower ends of conventional seat stays. To change the rear tire, the rear spindle is released and the chain case is rotated about the axis of the bottom bracket to swing the wheel clear of the frame. The wheel can then be separated from the bicycle without disturbing or exposing any drive train components by removing four wheel nuts and pulling the wheel off from the left side.
    Type: Grant
    Filed: August 18, 1987
    Date of Patent: September 13, 1988
    Inventor: Dirck T. Hartmann
  • Patent number: 4721015
    Abstract: A three stage, sixteen-speed, planetary driving wheel, with the pedal drive shaft on the axis of the wheel and vehicle interface fittings on both sides inboard of the pedal crank arms, for mounting in pedal powered vehicles to replace the chain and derailleur system used in conventional multiple speed bicycles. Because the planetary gear arrangement is completely enclosed inside the wheel hub where it is well protected from dirt, and because this driving wheel provides five low range speeds below direct drive, it is well suited for mountain bicycles or for transporting the payload of a bicycle camper up steep grades.
    Type: Grant
    Filed: September 8, 1986
    Date of Patent: January 26, 1988
    Inventor: Dirck T. Hartmann
  • Patent number: 4716777
    Abstract: A ten-speed transmission which is located inside the hub of the driving wheel of a pedal powered vehicle, and which includes a pedal drive shaft mounted in bearings on the axis of the wheel, is used to provide a compact, low maintenance alternative to the chain and derailleur system used for conventional multiple speed bicycles. Three idler shafts divide the pedal torque between three gear teeth permitting the gear widths to be one third that which would be required for a transmission using a single idler shaft. The resulting narrow gears coupled with a shift arrangement which adds nothing to the transmission width, permits the width between the pedals to be approximately that of a conventional chain driven bicycle. This transmission is particularly well suited for use in recumbent front wheel drive bicycles and tricycles.
    Type: Grant
    Filed: May 8, 1986
    Date of Patent: January 5, 1988
    Inventor: Dirck T. Hartmann
  • Patent number: 4715246
    Abstract: A three-speed planetary transmission which mounts inside the wheel hub concentric with the pedal drive shaft on the axis of the driving wheel of a vehicle such as a tricycle taxi. The transmission is characterized by three planet gears mounted in bearings on a gear carrier fitting driven by the pedal drive shaft. Rotatable sun and ring gears, which can be selectively locked against rotation, are in constant mesh with the planet gears. Conventional free-wheel ratchet mechanisms transfer torque from the sun and ring gears to the wheel hub. Two low gear ratios are provided to facilitate initial movement of a heavily loaded vehicle. The simplified gear shift, low maintenance, and compact nature of this chainless three speed transmission provide an improved alternative to the conventional three-speed chain drive for heavily loaded tricycles.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: December 29, 1987
    Inventor: Dirck T. Hartmann
  • Patent number: 4706982
    Abstract: A dual range planetary transmission which is located inside the hub of the driving wheel of a pedal powered vehicle such as a front wheel drive bicycle camper.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: November 17, 1987
    Inventor: Dirck T. Hartmann
  • Patent number: 4702121
    Abstract: A thirteen-speed driving wheel which includes a pedal drive shaft on the axis of the wheel, pedal crank arms, and vehicle interface fittings on both sides for mounting in pedal powered vehicles to replace the chain and derailleur system used in conventional bicycles. The driving wheel is particularly well suited for use in front wheel drive recumbent bicycles and tricycles and, because the driving gears are all enclosed within the wheel hub, provides a compact, low maintenance alternative to conventional chain drives.
    Type: Grant
    Filed: July 10, 1986
    Date of Patent: October 27, 1987
    Inventor: Dirck T. Hartmann
  • Patent number: 4694708
    Abstract: A single speed planetary transmission located inside the wheel hub of a pedal-propelled vehicle such as a bicycle. The transmission is chainless and includes a pair of fixed ring gears, planetary gear carriers mounted for rotation with the drive shaft, planetary gears carried by the gear carriers and meshed with the fixed ring gears, and a sun gear meshed with the planetary gears and coupled to the hub by a conventional free-wheel ratchet mechanism. The transmission provides an optimum gear ratio in a compact, chainless, low maintenance assembly.
    Type: Grant
    Filed: May 15, 1986
    Date of Patent: September 22, 1987
    Inventor: Dirck T. Hartmann
  • Patent number: 4666172
    Abstract: A multiple speed planetary transmission which mounts inside the wheel hub of the driving wheel or wheels of a bicycle or the like, concentric with the pedal drive shaft. The transmission includes a gear case mounted on ball bearings on the pedal drive shaft, a cylindrical extension of the gear case being clamped to the bicycle frame on one side. Multiple sets of different size planet gears are rotatably mounted on a planet gear carrier fitting driven by the pedal drive shaft. A ring gear is mounted in tracks in the gear case with its axial position adjustable so that it can be positioned to mesh with any one of multiple sets of different size planet gears. A sun gear assembly has its multiple gears in constant mesh, respectively, with multiple sets of planet gears. A conventional free-wheel ratchet mechanism drives the wheel hub from the sun gear assembly, and a second conventional free-wheel ratchet mechanism drives the sun gear assembly from the drive shaft to provide a direct drive option.
    Type: Grant
    Filed: April 7, 1986
    Date of Patent: May 19, 1987
    Inventor: Dirck T. Hartmann