초록 ▼

A base frame is provided defining two pairs of opposite marginal portions with the pairs of marginal portions spaced horizontally apart in vertical planes intersecting each other and the marginal portions of each pair spaced on opposite sides of the point of intersection of the planes. A first pair

A base frame is provided defining two pairs of opposite marginal portions with the pairs of marginal portions spaced horizontally apart in vertical planes intersecting each other and the marginal portions of each pair spaced on opposite sides of the point of intersection of the planes. A first pair of omnidirectional support structures are mounted from a first pair of the marginal portions and a second pair of reversely and variably drivable support structures are steerably mounted from the second pair of marginal portions for angular displacement about upstanding axes relative to the second pair of marginal portions. Further, steering control structure is operably connected between the frame and the second pair of support structures operable to selectively, variably and equally angularly displace the second pair of support structures relative to the second marginal portions. A pair of extendible uprights are mounted at their lower ends from the frame for equal angular displacement about a first horizontal axis extending therebetween and equal angular displacement about horizontal axes generally normal to the first axis. A brace is pivotally connected between the upper extendible ends of the uprights and includes a sleeve thereon oscillatable about its longitudinal axis and a support arm projects outwardly from the sleeve and is longitudinally extendible. The outer extendible end of the arm supports an operator mount therefrom for adjustable angular displacement about a horizontal axis transverse to the support arm.

대표청구항 ▼

A mobile support including a base frame defining two pairs of opposite marginal portions with said pairs of marginal portions spaced horizontally apart in vertical planes intersecting each other and with each pair of marginal portions spaced on opposite sides of the point of intersection of said pla

A mobile support including a base frame defining two pairs of opposite marginal portions with said pairs of marginal portions spaced horizontally apart in vertical planes intersecting each other and with each pair of marginal portions spaced on opposite sides of the point of intersection of said planes, a first pair of omnidirectional ground engageable support means mounted from a first pair of said marginal portions and a second pair of reversely and variably drivable ground engageable support means steerably mounted from the second pair of marginal portions for angular displacement about upstanding axes relative to the second pair of marginal portions, and steering control means operably connected between said frame and said second pair of support means for selectively variably and equally angularly displacing said second pair of support means relative to said second marginal portions.