A snake board apparatus includes: a front footboard part (100) on which a user puts one foot; a rear footboard part (200) on which a user puts the other foot; and a connecting part (300) connecting the front footboard part (100) and the rear footboard part (200) to each other. The connecting part (300) includes: a first finishing member (310) inserted into the housing (120) of the front footboard part (100); a first pipe (320) having one end portion connected to surround a portion of the first finishing member (310) and the other end portion provided with a concave part (322); a second pipe (330) having one end portion integrally provided with a first stopper (332), an outer circumferential surface provided with a coil spring (340), and the other end portion provided with a concave part (334), wherein a locking part (336) is formed at an end portion with a certain interval from the concave part, and second pipe 330 penetrating the first pipe 320 and inserted into the first pipe at a predetermined depth, and the second pipe (330) passes through the first pipe (320) and is inserted into the first pipe by a certain depth; a third pipe (370) having one end portion integrally provided with a third stopper (372) contacting the first finishing member (310), an outer circumferential surface provided with a coil spring (380), and an end portion provided with a locking part (374), wherein the third pipe (370) passes through the second pipe (330) and is inserted into the first pipe (320); a hollow second finishing member (392) inserted through the other end portion of the third pipe (370); a third finishing member (394) having a hollow cap shape and inserted into the second finishing member (392) at a certain depth; and an elastic member (396) having one end portion connected to the first finishing member (310) through the first pipe (320), the second pipe (330), and the third pipe (370), and the other end portion connected to the third finishing member (394) to prevent a separation thereof.

A swivel caster includes a swivel assembly having a swivel plate configured to be mounted to a vehicle and defining a swivel axis. A horn depends downwardly from the swivel assembly and a wheel is wheel coupled to the horn with a wheel axle. A slide mechanism couples the horn to the swivel assembly and enables the wheel to slide in a direction generally perpendicular to the swivel axis between first and second trailing positions. The slide mechanism swivels with the horn, the wheel, and the swivel plate about the swivel axis. A swivel limiter is operatively associated with the swivel assembly and limits a swiveling range of the wheel about the swivel axis so as to activate the slide mechanism to reposition the wheel from the first trailing position to the second trailing position when a direction of travel of the vehicle changes.

The present invention relates to an improvement in caster swivel restriction structure. The present invention is characterized in that a swivel brake plate has a body piece having a plurality of through holes arranged therein and latch pieces bent downward from the body piece, a support base has latch hole portions for fitting the latch pieces in a vertical slidable manner, a gap portion provided at a location corresponding to below the group of through holes formed in the swivel brake plate, and cushioning members or biasing members which are disposed in the gap portion and supports the swivel brake plate aloft and which is repulsively compressed when downward force is applied to the swivel brake plate.

In a heavy duty orbital caster assembly that includes a rotatable wheel unit joined to a transfer plate that pivots about a mounting post extending from a mounting plate adapted to be secured to the bottom surface of an object, the improvement comprising a pair of roller bearing assemblies that extend upwardly from the upper surface of the transfer plate adjacent to the caster wheel post as it extends through its bearing. The rollers impinge on the lower surface of the mounting plate, and serve to transfer some of the load of the supported object directly to the caster wheel, enabling the support of very heavy loads.

A guided vehicle includes: a first wheel section positioned at a front end portion of a base; and second and third wheel sections which are independent from each other. The first wheel section includes a left-right frame body, and swivel wheels arranged on left and right portions of the left-right frame body. An intermediate position between the swivel wheels in the left-right frame body is supported to be swingable about a front-rear axis relative to the base. Each of the second wheel section and the third wheel section includes a front-rear frame body, and a driving wheel and a swivel wheel which are respectively arranged at a front portion and a rear portion of the front-rear frame body. An intermediate position between the driving wheel and the swivel wheel of each front-rear frame body is supported to be swingable about the left-right axis and the front-rear axis relative to the base.

A system for sensing the angular position of a caster wheel includes a sensor mounted on a bearing which supports a shaft aligned with the rotational axis of the caster. A target on the shaft is detected by the sensor which generates signals indicative of the presence or absence of the target. The position of the target is coordinated with the position of the caster wheel such that the signals are indicative of the angular position of the caster wheel. The target may be a groove extending partially around the shaft and a remaining ungrooved portion of the shaft.

Systems and methods are disclosed for holonomic drivetrain modules for mobile robots. In one embodiment, an example mobile robot may include a chassis, and a holonomic drivetrain module removably coupled to the chassis. The holonomic drivetrain module may include a first drive wheel having a caster angle of substantially zero, a first bearing block assembly vertically aligned with the first drive wheel, and a first steer motor coupled to the first bearing block assembly and vertically aligned with the first drive wheel.

This application relates to a wheel steering angle adjustment device for a vehicle operated by manpower. The device may include a fixed body including a rotation support, a rotation body, a lift member coupled to the rotation support, a locking switch coupled to the lift member, and a plurality of fixing groove portions in the outer peripheral surface of the rotation support. The device may also include a fixing protrusion protruding from the locking switch and configured to be detachably coupled to the fixing groove portions, a rotation range limiting stopper provided on a lower portion of the lift member, and a rotation guide groove portion provided concavely in an upper surface of the rotation body. As the rotation range limiting stopper becomes stuck on an end portion of the rotation guide groove portion, an angle by which the rotation body is rotatable relative to the fixed body is limited.

This application relates to a wheel steering angle adjustment device for a vehicle operated by manpower. The device may include a fixed body including a rotation support, a rotation body, a lift member coupled to the rotation support, a locking switch coupled to the lift member, and a plurality of fixing groove portions in the outer peripheral surface of the rotation support. The device may also include a fixing protrusion protruding from the locking switch and configured to be detachably coupled to the fixing groove portions, a rotation range limiting stopper provided on a lower portion of the lift member, and a rotation guide groove portion provided concavely in an upper surface of the rotation body. As the rotation range limiting stopper becomes stuck on an end portion of the rotation guide groove portion, an angle by which the rotation body is rotatable relative to the fixed body is limited.

A hydraulic system for controlling at least one steerable caster wheel of an agricultural machine includes a first actuator having a piston and including an inboard fluid port for supplying fluid to a first side of the piston to move the piston in a first direction, and an outboard fluid port for supplying fluid to a second side of the piston to move the piston in a second direction. A first fluid pressure equalizer is fluidically coupled to the first side actuator and operable to equalize fluid pressure over a period of time between the first side and the second side of the piston of the first side actuator.