Abstract: Low-noise electric lawnmowers comprise curved cutting blades. In some examples, a lawnmower comprises a driving unit and a mowing unit with a mowing-unit deck. The mowing-unit deck comprises a set of blade units (e.g., 3 units) and a discharge conduit. Each blade unit comprises a blade enclosure and a cutting blade with a cutting edge having a curved shape. For example, the cutting edge, at a point furthest away from the blade center axis, may form an approach angle of greater than 90° but be less than 90° closer to the blade center. This curving aspect allows operating the blade at lower rotating speeds (e.g., less than 3,000 RPM), which reduces the turbulence and noise. In some examples, the blade enclosure forms an enclosure tunnel such that the tunnel's cross-sectional area increases from the tunnel's inlet to the outlet.

Abstract: Electric lawnmowers comprise drive units and mowing units disengageably coupled to the drive units. For example, a drive unit can be disengageably coupled to any one of multiple mowing units (e.g., rotating mowing units, reel mowing units) collecting forming a mowing system. For example, each of the drive and mowing units may be equipped with corresponding mechanical-engagement structures that are configured to be disengageably coupled. Each mowing unit is equipped with its electric motor (e.g., for rotating the cutting blades or the reel of that unit). The electric motor may comprise an electric connector, which is disengageably coupled to the drive unit's electrical wiring. In some examples, each mowing unit can also form a liquid disengageable coupling for circulating a thermal liquid between the drive unit and mowing unit, e.g., for cooling various components of the drive unit.

Abstract: Electric lawnmowers comprise mowing-unit decks with fluid passages used for cooling batteries, power electronics units, and/or drive motors. Specifically, a lawnmower comprises a drive unit (with a battery, power electronics, and one or more drive motors) and a mowing unit (with a mowing-unit deck). The deck's fluid passage is fluidically coupled to the drive unit (e.g., the motor and power electronics). The thermal liquid is heated by the drive unit's components and cooled as the liquid passes through the deck's fluid passage. The mowing unit may be equipped with a pump (for circulating this liquid), which can be powered by an electric motor on the mowing unit. The same motor may be used for rotating the cutting blades. The drive unit may have an additional cooling circuit providing immersion cooling to the batteries.

Abstract: The present invention relates to providing systems, methods, and apparatuses for using machine learning to categorize and select suggested source entities. In some embodiments, such a system may comprise receiving a resource file from a user; normalizing the at least one supplier entity name to generate at least one normalized supplier entity name; determining the at least one normalized supplier entity name matches an authenticated supplier entity name of an entity name master record; updating a source entity management database; receiving a user indication; applying the at least one pre-determined variable standard and the selected category to a source entity suggestion model to output at least one suggested source entity name that matches the pre-determined variable standard and the selected category; and generating a suggested source entity interface component to configure a graphical user interface of a user device associated with the user.

Abstract: An exercise machine including a vertical post and an adjustable pulley. The vertical post includes a plurality of engagement holes. The adjustable pulley is slideably connected to the vertical post. The adjustable pulley includes a pull pin and a lock. The pull pin is selectively engageable with one of the plurality of engagement holes. In response to the pull pin being engaged with an engagement hole, movement of the adjustable pulley relative to the vertical post is restricted. The lock is selectively engageable with the pull pin. In response to the lock being engaged with the pull pin, movement of the pull pin is restricted.

Abstract: A golf practice apparatus includes a first frame member that defines a first catch area, and a second frame member connected to the first frame member, the second frame member defining a second catch area. A canopy includes a support member connected to the first and second frame members. The canopy defines a third catch area. A membrane extends over the first, second, and third catch areas. The membrane stops projectiles hit by a golf club in the first, second, and third catch areas.

Abstract: A stationary exercise cycle. The stationary exercise cycle includes a frame, a crank rotatably connected to the frame, a driven wheel rotatably connected to the frame, and a frame stiffener. The frame includes a down tube and a fork. The crank and the driven wheel are in operative communication via a continuous flexible member. The frame stiffener is connected to the down tube and the fork and encircled by the continuous flexible member.

Abstract: An exercise machine including a vertical post and an adjustable pulley. The vertical post includes a plurality of engagement holes. The adjustable pulley is slideably connected to the vertical post. The adjustable pulley includes a pull pin and a lock. The pull pin is selectively engageable with one of the plurality of engagement holes. In response to the pull pin being engaged with an engagement hole, movement of the adjustable pulley relative to the vertical post is restricted. The lock is selectively engageable. In response to the lock being engaged with the pull pin, movement of the pull pin is restricted.

Abstract: A crank-driven exercise device (100). The crank-driven exercise device (100) includes a frame (102), a spindle (202) rotatably connected to the frame (102), a crank arm (104) connected to the spindle (202), and a user input (208) connected to the crank arm (104) configured to receive a force from a user. In some embodiments, the crank arm (104) includes a proximal section (204) and a distal section (206). The proximal section (204) may be connected to the spindle (202) at a spindle interface (302), the distal section (206) may be rotatably connected to the user input (208) at a user input interface (306), and the distal section (206) may be selectively fastenable and selectively rotatable relative to the proximal section (204) at a crank interface (304).

Abstract: A stationary exercise cycle. The stationary exercise cycle includes a frame, a crank rotatably connected to the frame, a driven wheel rotatably connected to the frame, and a frame stiffener. The frame includes a down tube and a fork. The crank and the driven wheel are in operative communication via a continuous flexible member. The frame stiffener is connected to the down tube and the fork and encircled by the continuous flexible member.

Abstract: A cycle with tapered drivetrain connections. The cycle includes a frame, a crank rotatably connected to the frame, and a driven wheel rotatably connected to the frame. The crank includes a crank arm and a crank spindle rotatably connected to the frame and non-rotatably connected to the crank arm. The crank spindle includes a crank mating surface to interface with the crank arm. The diameter of the crank spindle continuously decreases along at least a portion of the crank mating surface in a lateral direction. The crank arm includes a crank bore to interface with the crank mating surface. At least a portion of the crank bore has a diameter that continuously decreases in lateral direction. At least a portion of the crank bore taper has a taper rate and diameter equal to a taper rate and diameter of at least a portion of the crank spindle taper.

Abstract: A dual treadle treadmill. The dual treadle treadmill includes a frame, a first treadle, a second treadle, and a generator. The first treadle and the second treadle are each pivotally coupled with the frame and each have a moving surface. The generator is operably associated with the first treadle such that the generator is driven in response to the first treadle pivoting relative to the frame. Other embodiments of dual treadle treadmills are also described.

Abstract: A crank-driven exercise device (100). The crank-driven exercise device (100) includes a frame (102), a spindle (202) rotatably connected to the frame (102), a crank arm (104) connected to the spindle (202), and a user input (208) connected to the crank arm (104) configured to receive a force from a user. In some embodiments, the crank arm (104) includes a proximal section (204) and a distal section (206). The proximal section (204) may be connected to the spindle (202) at a spindle interface (302), the distal section (206) may be rotatably connected to the user input (208) at a user input interface (306), and the distal section (206) may be selectively fastenable and selectively rotatable relative to the proximal section (204) at a crank interface (304).

Abstract: An exercise apparatus with a generator. The exercise apparatus includes a frame, a rotating component, a generator, and a battery. The rotating component is rotatably connected to the frame and the rotating component rotates in response to operation of the exercise apparatus. The generator is connected to the rotating component and the frame. The generator includes a rotor connected to the rotating component and a stator. The rotor rotates in response to rotation of the rotating component. The stator is connected to the frame. The stator interacts with the rotor to produce electric current at an output. In one embodiment, the battery is connected to the output wherein the battery is charged by electric current from the generator.

Abstract: A dual treadle treadmill. The dual treadle treadmill includes a frame, a first treadle, a second treadle, a clutch axle, and a tensioning mechanism. The first treadle and the second treadle are each pivotally coupled with the frame and each have a moving surface. The clutch axle includes an axle, a first driver, and a second driver. The axle is rotatably connected to the frame. The first driver is coupled to the axle by a first clutch. The first clutch transmits torque between the first driver and the axle in response to the first driver rotating in a first direction relative to the axle. The first treadle is connected to the first driver through a first link such that the first driver is rotated in a first direction in response to the first treadle being pivoted in the first direction. The tensioning mechanism maintains a tension on the first link.

Abstract: A dual treadle treadmill. The dual treadle treadmill includes a frame, a first treadle, a second treadle, and a generator. The first treadle and the second treadle are each pivotally coupled with the frame and each have a moving surface. The generator is operably associated with the first treadle such that the generator is driven in response to the first treadle pivoting relative to the frame. Other embodiments of dual treadle treadmills are also described.

Abstract: An exercise apparatus with a generator. The exercise apparatus includes a frame, a rotating component, a generator, and a battery. The rotating component is rotatably connected to the frame and the rotating component rotates in response to operation of the exercise apparatus. The generator is connected to the rotating component and the frame. The generator includes a rotor connected to the rotating component and a stator. The rotor rotates in response to rotation of the rotating component. The stator is connected to the frame. The stator interacts with the rotor to produce electric current at an output. In one embodiment, the battery is connected to the output wherein the battery is charged by electric current from the generator.

Abstract: A cycle with tapered drivetrain connections. The cycle includes a frame, a crank rotatably connected to the frame, and a driven wheel rotatably connected to the frame. The crank includes a crank arm and a crank spindle rotatably connected to the frame and non-rotatably connected to the crank arm. The crank spindle includes a crank mating surface to interface with the crank arm. The diameter of the crank spindle continuously decreases along at least a portion of the crank mating surface in a lateral direction. The crank arm includes a crank bore to interface with the crank mating surface. At least a portion of the crank bore has a diameter that continuously decreases in lateral direction. At least a portion of the crank bore taper has a taper rate and diameter equal to a taper rate and diameter of at least a portion of the crank spindle taper.

Abstract: A sensor for performing micro-conductivity measurements during well logging measurements in a borehole includes a magnetic core having a conductive insert wherein windings are driven with alternating current. Some embodiments include a sensor further having a conductive case. Various aspects of the sensor, such as dimensions and conductive properties of fabrication materials are selected to maximize performance of the sensor. Methods for using the sensor call for, among other things, placing the sensor in a well logging tool, and placing the tool in a well bore. A substantial focusing of the magnetic field on the wall of the borehole is achieved and provides for high quality data.