Abstract: A work machine (10) such as a lawnmower provided with a height adjusting mechanism comprises a machine main body (12), a guide member (50) supported on the machine main body so as to be rotatable around a vertical axis, a support member (60) engaged by the guide member via a converting mechanism that converts a rotational motion of the guide member into a vertical motion of the support member, a work unit (18) supported by the support member, and a sheet spring (66) provided on the machine main body and resiliently and slidably abutting against the support member to urge the support member in a prescribed rotational direction.

Abstract: A lawn mower includes a first blade having a first tip, and a second blade having a second tip, wherein the first blade and the second blade are disposed adjacent to each other, and a rotation direction of the first blade is different from a rotation direction of the second blade, wherein, in a lateral direction of the lawn mower, a guide plate is disposed between a rotation center of the first blade and a rotation center of the second blade, and the guide plate is disposed above the second blade, and the guide plate extends toward a rear of the lawn mower.

Abstract: A work machine comprising: a blade; a blade housing; and a guard pole portion provided below the blade, wherein the guard pole portion is supported by the blade housing, and the guard pole portion includes an inclined portion extending in an oblique direction with respect to a machine body longitudinal direction of the work machine.

Abstract: A remote display system includes a screen display controller configured to perform a first screen switching process of switching a monitor screen to be displayed on a terminal display unit of a display terminal from a first monitor screen for displaying a first image range of a captured image by a robot camera to a second monitor screen for displaying a second image range different from the first image range of the captured image, in accordance with a predetermined screen switching condition.

Abstract: Each side frame that supports a traveling machine body includes a front insertion support member and a rear insertion support member that can be inserted into a front support member and a rear support member, respectively. The grass mower includes bolts that are couplable selectively in a first state where the front insertion support member and the rear insertion support member are inserted between a front upper member and a rear upper member, and a front lower member and a rear lower member, respectively, and a second state where the front insertion support member and the rear insertion support member are mounted on lower surfaces of the front lower member and the rear lower member, respectively.

Abstract: A remote display system includes a screen display controller configured to perform a first screen switching process of switching a monitor screen to be displayed on a terminal display unit of a display terminal from a first monitor screen for displaying a first image range of a captured image by a robot camera to a second monitor screen for displaying a second image range different from the first image range of the captured image, in accordance with a predetermined screen switching condition.

Abstract: An information management apparatus that manages information on a self-propelled work machine, the apparatus comprising a registration unit that registers one or more users, a receiving unit that receives a predetermined request from the work machine, a notification unit that notifies the registered one or more users of the request, and a providing unit that provides an incentive to a user who has responded to the request, the user being among the registered one or more users.

Abstract: A work machine (10) such as a lawnmower provided with a high adjusting mechanism comprises a machine main body (12), an guide member (50) supported on the machine main body so as to be rotatable around a vertical axis, a support member (60) engaged by the guide member via a converting mechanism that converts a rotational motion of the guide member into a vertical motion of the support member, a work unit (18) supported by the support member, and a sheet spring (66) provided on the machine main body and resiliently and slidably abutting against the support member to urge the support member in a prescribed rotational direction.

Abstract: In a utility vehicle, equipped with a lawnmower work unit having a circular single blade disk rotatable around a rotating shaft connected to an output shaft of a work motor (prime mover) mounted on a chassis, and multiple (three) blades attached to a circumference of the blade disk at equally spaced apart positions, a single second disk is fixed to a middle of the surface of the blade disk of the lawnmower work unit at fixing positions that are spaced apart from each other.

Abstract: An autonomous lawn mower includes a movable cover covering a traveling frame and holding devices holding the movable cover. Each holding device includes a holding shaft and a shaft holding unit. The holding shaft includes a lower half portion and an upper half portion. The shaft holding unit holds the lower half portion accommodated in an accommodating portion of the traveling frame such that the lower half portion can slide in only a horizontal direction. The upper half portion extends through a through hole of the movable cover by extending upward from the traveling frame, thereby holding the movable cover so that the movable cover is vertically displaceable. A coil spring intervenes between a receiving portion and an upper wall of the movable cover. One holding device includes a detector which detects the slide displacement amount of the lower half portion.

Abstract: A lawn mower includes a driving source mounting portion formed in a traveling frame, a driving source mounted in the driving source mounting portion, and a lawn mowing unit attached to the driving source. A bottom surface of the traveling frame includes a frame-side seal surface surrounding the lower end of the driving source mounting portion, and a lawn mowing unit peripheral surface surrounding the frame-side seal surface. A waterproof member is in tight contact with the frame-side seal surface. The lawn mowing unit peripheral surface is formed over a range from an outer circumferential edge of the frame-side seal surface to an outer circumferential edge of the lawn mowing unit. A boundary between the frame-side seal surface and lawn mowing unit peripheral surface is formed into the shape of a step.

Abstract: In a utility vehicle, equipped with a lawnmower work unit having a circular single blade disk rotatable around a rotating shaft connected to an output shaft of a work motor (prime mover) mounted on a chassis, and multiple (three) blades attached to a circumference of the blade disk at equally spaced apart positions, a single second disk is fixed to a middle of the surface of the blade disk of the lawnmower work unit at fixing positions that are spaced apart from each other.

Abstract: An autonomous lawn mower, comprising a traveling frame provided with traveling wheels, a motor holding member for vertically moving while holding a cutter blade driving motor, a vertical driving member vertically moving the motor holding member, and one of a vertical driving motor or a manual driving mechanism, the vertical driving motor electrically driving the vertical driving member, the manual driving mechanism manually driving the vertical driving member, the frame including a support portion for supporting the vertical driving member, a motor mounting portion for mounting the vertical driving motor, and a manual driving mechanism mounting portion for mounting the manual driving mechanism, and, when the frame is viewed from above, the motor mounting portion and the manual driving mechanism mounting portion are positioned in different phases around the support portion.

Abstract: An autonomous lawn mower includes a movable cover covering a traveling frame and holding devices holding the movable cover. Each holding device includes a holding shaft and a shaft holding unit. The holding shaft includes a lower half portion and an upper half portion. The shaft holding unit holds the lower half portion accommodated in an accommodating portion of the traveling frame such that the lower half portion can slide in only a horizontal direction. The upper half portion extends through a through hole of the movable cover by extending upward from the traveling frame, thereby holding the movable cover so that the movable cover is vertically displaceable. A coil spring intervenes between a receiving portion and an upper wall of the movable cover. One holding device includes a detector which detects the slide displacement amount of the lower half portion.

Abstract: A lawn mower includes a driving source mounting portion formed in a traveling frame, a driving source mounted in the driving source mounting portion, and a lawn mowing unit attached to the driving source. A bottom surface of the traveling frame includes a frame-side seal surface surrounding the lower end of the driving source mounting portion, and a lawn mowing unit peripheral surface surrounding the frame-side seal surface. A waterproof member is in tight contact with the frame-side seal surface. The lawn mowing unit peripheral surface is formed over a range from an outer circumferential edge of the frame-side seal surface to an outer circumferential edge of the lawn mowing unit. A boundary between the frame-side seal surface and lawn mowing unit peripheral surface is formed into the shape of a step.

Abstract: In a utility vehicle having a body and driven wheels rotatably fastened to the body, auxiliary driven wheels, having an outer diameter smaller than that of the driven wheels and a width equal to or smaller than that of the driven wheels, are coaxially fixed to the driven wheels.

Abstract: An autonomous lawn mower, comprising a traveling frame provided with traveling wheels, a motor holding member for vertically moving while holding a cutter blade driving motor, a vertical driving member vertically moving the motor holding member, and one of a vertical driving motor or a manual driving mechanism, the vertical driving motor electrically driving the vertical driving member, the manual driving mechanism manually driving the vertical driving member, the frame including a support portion for supporting the vertical driving member, a motor mounting portion for mounting the vertical driving motor, and a manual driving mechanism mounting portion for mounting the manual driving mechanism, and, when the frame is viewed from above, the motor mounting portion and the manual driving mechanism mounting portion are positioned in different phases around the support portion.

Abstract: In a utility vehicle having a body and driven wheels rotatably fastened to the body, auxiliary driven wheels, having an outer diameter smaller than that of the driven wheels and a width equal to or smaller than that of the driven wheels, are coaxially fixed to the driven wheels.

Abstract: A jet propulsion craft propelled upon a water surface generally comprises a hull structure comprising a bottom plate and an upper plate, an engine mounted upon the bottom plate at substantially a middle portion of the hull structure as considered in the longitudinal direction thereof, the engine being provided with an exhaust port, an exhaust system extending rearwardly from the engine and provided with an inlet end and an outlet end, the inlet end being operatively connected to the engine exhaust gas discharging port, and a jet pump mounted upon the bottom plate at a rear portion of the hull structure and driven by means of the engine. An exhaust gas noise eliminating device operatively connected to the outlet end of the exhaust system is further provided for the craft for eliminating the exhaust gas noise in a stepwise manner.