Abstract: A damper that includes a piston reciprocally movable in a cylinder thereby dividing an interior of the cylinder into a first chamber located at an open end side and a second chamber located at a closed end side, a piston rod having a distal end to which the piston is connected and a rear end side protruding outward from the open end of the cylinder, a rod guide fixed to the open end of the cylinder and having a through hole through which the piston rod is reciprocally movable, and a seal which is provided in the rod guide so as to be located at a position spaced away from an outer end of a sliding surface of the through hole to the first chamber side by a distance longer than a maximum stroke width of the piston rod.

Abstract: A driving assist unit of a truck for assisting a driving force applied to the truck by a worker includes a unit body connected to the truck, the unit body being turnable with respect to the truck, an operation portion provided on the unit body, the operation portion being configured to input a driving force to the truck through the unit body by being pressed by the worker, a driving wheel provided on the unit body, the driving wheel being rotatable in a longitudinal direction of the unit body, an assist force according to the operation of the operation portion being applied to the driving wheel, a lower engagement mechanism configured to be engaged with a connecting rod, the connecting being provided protruding to an outside from the truck and perpendicularly with respect to a ground, the lower engagement mechanism being slidable in an axial direction with respect to the connecting rod, and an upper engagement mechanism provided above the lower engagement mechanism and configured to be engaged with the connec

Abstract: A driving assist unit of a truck for assisting a driving force applied to the truck by a worker includes a unit body connected to the truck, the unit body being turnable with respect to the truck, an operation portion provided on the unit body, the operation portion being configured to input a driving force to the truck through the unit body by being pressed by the worker, a driving wheel provided on the unit body, the driving wheel being rotatable in a longitudinal direction of the unit body, an assist force according to the operation of the operation portion being applied to the driving wheel, a lower engagement mechanism configured to be engaged with the truck by pressing the unit body onto the truck, and an upper engagement mechanism provided above the lower engagement mechanism and configured to be engaged with the truck by fitting of a locking member by the worker.

Abstract: A driving assist unit of a truck for assisting a driving force applied to the truck by a worker includes a unit body connected to the truck, the unit body being turnable with respect to the truck, an operation portion provided on the unit body, the operation portion being configured to input a driving force to the truck through the unit body by being pressed by the worker, and a driving wheel provided on the unit body, the driving wheel being rotatable in a longitudinal direction of the unit body, an assist force according to the operation of the operation portion being applied to the driving wheel.

Abstract: An electric assist cart includes: a drive wheel provided in a body frame; a control handle used by an operator to input a driving force to the body frame; a torque sensor that detects a driving torque applied to the body frame from the control handle; a controller that computes an assisting force applied to the drive wheel based on the driving torque; an electric motor that applies the assisting force to the drive wheel; a brake that brakes the drive wheel and switches from a braking state to an unbraking state when a predetermined electric current flows; and a brake release switch manipulated by an operator to allow the controller to instruct the predetermined electric current to flow to the brake, wherein the controller maintains the braking state of the brake even when the brake release switch is manipulated without turning on power, and power is then turned on.

Abstract: An electric assist cart includes: a body frame where a burden can be loaded; a drive wheel provided in the body frame; a control handle by which an operator can input a driving force to the body frame; a torque sensor that detects a driving torque applied to the body frame by pushing and handling the control handle; an electric motor that applies an assisting force to the drive wheel depending on the driving torque detected by the torque sensor; and a controller that computes the assisting force applied to the drive wheel and supplies an electric current to the electric motor depending on the assisting force, wherein the controller has a plurality of modes having different characteristics for a change of a magnitude of the electric current depending on the driving torque, and the electric current can be supplied to the electric motor by switching the mode.

Abstract: A conveyance cart that can convey a loaded burden, includes: a body frame supported by a wheel; a deck provided liftably against the body frame to load a burden; an electric actuator electrically driven to expand or contract to lift or lower the deck; and a controller that is configured to supply an electric current to the electric actuator. The controller stops supply of an electric current to the electric actuator when a continuous driving time of the electric actuator is equal to or longer than a predetermined time.

Abstract: An electric assist cart includes: a body frame; a drive wheel; a control handle by which a user can input a driving force to the body frame; a torque sensor that detects a driving torque input to the body frame from the control handle; a controller that computes an assisting force based on the driving torque; and an electric motor that applies the assisting force to the drive wheel. The controller includes an electric current determination part that determines whether or not an electric current having a magnitude equal to or larger than a first setting value continuously flows for a first setting time, and an electric current control part that reduces a maximum value of the electric current that can be supplied to the electric motor to be smaller than the first setting value based on the determination of the electric current determination part.

Abstract: A conveyance cart includes: a body frame; a deck provided liftably against the body frame to load a burden; an electric actuator electrically driven to expand or contract to lift or lower the deck; a current detection element that detects an electric current value supplied to the electric actuator; and a PWM control element that drives the electric actuator in a pulse width modulation (PWM) control manner. The PWM control element increases an on-duty ratio input to the electric actuator if the electric current value detected by the current detection element exceeds a setting value when the deck is lifted.

Abstract: Disclosed is an electric assist cart that can travel by applying an assisting force in addition to a driving force applied by an operator. A controller operates an electric motor to apply a determined assisting force to a drive wheel and lifts or lowers a deck lift portion in response to an instruction for lifting or lowering a deck. When a handling detection part detects an instruction for braking the brake, the brake is braked, and an operation of the electric motor is inhibited regardless of a detection result of the torque detection part.

Abstract: A conveyance cart that can convey a loaded burden, includes: a body frame supported by a wheel; a deck provided liftably against the body frame to load a burden; an electric actuator electrically driven to expand or contract to lift or lower the deck; and a controller that is configured to supply an electric current to the electric actuator. The controller stops supply of an electric current to the electric actuator when a continuous driving time of the electric actuator is equal to or longer than a predetermined time.

Abstract: An electric assist cart includes: a body frame where a burden can be loaded; a drive wheel provided in the body frame; a control handle by which an operator can input a driving force to the body frame; a torque sensor that detects a driving torque applied to the body frame by pushing and handling the control handle; an electric motor that applies an assisting force to the drive wheel depending on the driving torque detected by the torque sensor; and a controller that computes the assisting force applied to the drive wheel and supplies an electric current to the electric motor depending on the assisting force, wherein the controller has a plurality of modes having different characteristics for a change of a magnitude of the electric current depending on the driving torque, and the electric current can be supplied to the electric motor by switching the mode.

Abstract: An electric assist cart includes: a drive wheel provided in a body frame; a control handle used by an operator to input a driving force to the body frame; a torque sensor that detects a driving torque applied to the body frame from the control handle; a controller that computes an assisting force applied to the drive wheel based on the driving torque; an electric motor that applies the assisting force to the drive wheel; a brake that brakes the drive wheel and switches from a braking state to an unbraking state when a predetermined electric current flows; and a brake release switch manipulated by an operator to allow the controller to instruct the predetermined electric current to flow to the brake, wherein the controller maintains the braking state of the brake even when the brake release switch is manipulated without turning on power, and power is then turned on.

Abstract: An electric assist cart includes: a body frame; a drive wheel; a control handle by which a user can input a driving force to the body frame; a torque sensor that detects a driving torque input to the body frame from the control handle; a controller that computes an assisting force based on the driving torque; and an electric motor that applies the assisting force to the drive wheel. The controller includes an electric current determination part that determines whether or not an electric current having a magnitude equal to or larger than a first setting value continuously flows for a first setting time, and an electric current control part that reduces a maximum value of the electric current that can be supplied to the electric motor to be smaller than the first setting value based on the determination of the electric current determination part.

Abstract: A center portion (30) of a V-shaped cutter blade (20) includes center large teeth (31) and center middle teeth 32 the tooth height of which is less than the tooth height of the center large teeth (31). End portions (50) of the cutter blade (20) each include first end teeth (51) and second end teeth (52) the tooth height of which is less than the tooth height of the first end teeth (51). Tooth tops of the first end teeth 51 of each end portion (50) are located on a straight line (L1), which extends through tooth tops of the center large teeth (31) located on one of the right half and the left half of the center portion (30).

Abstract: A center portion (30) of a V-shaped cutter blade (20) includes center large teeth (31) and center middle teeth 32 the tooth height of which is less than the tooth height of the center large teeth (31). End portions (50) of the cutter blade (20) each include first end teeth (51) and second end teeth (52) the tooth height of which is less than the tooth height of the first end teeth (51). Tooth tops of the first end teeth 51 of each end portion (50) are located on a straight line (L1), which extends through tooth tops of the center large teeth (31) located on one of the right half and the left half of the center portion (30).

Abstract: A cutting edge 24 is divided into a center area 28 including a V-shaped apex portion, a pair of intermediate areas 29 on the outer sides thereof, and a pair of side areas 30 on the farther outer sides thereof. The center area 28 has first teeth with the highest tooth height and second teeth with a smaller tooth height, the first teeth being situated at the apex portion and the second teeth being situated between the first teeth at a prescribed spacing around them as the center. A first straight line connecting the tips of the first teeth, a second straight line connecting the tips of the second teeth and a third straight line connecting the bases of the first teeth and second teeth are parallel, the second straight line being located between the first straight line and third straight line. The tips of the intermediate teeth of the intermediate area 29 are located on the second straight line or between the second straight line and third straight line.

Abstract: 1. An ester copolymer resin having a general formula ?I!.HO.paren open-st.COArCOORO.paren close-st..sub.n H ?I!wherein Ar represents 2,6-naphthalene group or phenylene group, R represents ethylene group or 1,4-cyclohexylene group, and n is a number of 100 to 1000 and a polymer alloy having a solubility parameter of 10.8 to 11.9 consisting essentialy of the ester copolymer and a polycarbonate resin are provided. The ester resin and the alloy are transparent and has a heat resistance and a hot water resistance (resistance to whitening) resisting sterilization of food, a good heat sealebility to aluminum closure, and recycling ability with PET resin.

Abstract: 1. An ester copolymer resin having a general formula ?I!. ##STR1## wherein Ar represents 2,6-naphthalene group or phenylene group, R represents ethylene group or 1,4-cyclohexylene group, and n is a number of 100 to 1000 and a polymer alloy having a solubility parameter of 10.8 to 11.9 consisting essentialy of the ester copolymer and a polycarbonate resin are provided. The ester resin and the alloy are transparent and has a beat resistance and a hot water resistance (resistance to whitening) resisting sterilization of food, a good heat sealability to aluminum closure, and recycling ability with PET resin.

Abstract: A phase comparison circuit includes phase comparison device for generating an output signal corresponding to the difference in phase between a first input signal and a second input signal. The phase comparison device has an active mode, and a standby mode in which power consumption is reduced. A phase-difference detecting device is connected to the phase comparison device for outputting a control signal when the phase difference between the first and second input signals is smaller than a predetermined value. The phase comparison device is switched from the standby mode to the active mode in response to the control signal.