Seal coating machine

Claim 2

A machine of the type for applying a coating to a surface such as applying a sealant to asphalt pavement, said machine comprising; body means including spreader means for distributing fluid over a surface and reservoir means for storing fluid and dispensing fluid to said spreader means, first wheel means movably supporting said body means and connected to said body means for rotation relative thereto about an axis, said spreader means disposed on a first side of said axis, second wheel means disposed on a second side of said axis, and positioning means interconnecting said second wheel means and said body means to move the body means relative to the second wheel means for rotating said body means about said axis to vary the vertical position of said spreader means above the surface supporting said machine said second wheel means including at least one shaft support operatively connected to said positioning means, at least one shaft rotatably supported by said shaft support, at least one dirigible wheel operatively connected to said shaft, and steering means connected to said shaft for rotating said shaft to steer said machine.

Claim 3

A machine as set forth in claim 1 wherein said positioning means includes a manually graspable lever arm pivotally supported on said body means for movement between an extreme raised position where said spreader means is at a maximum height relative to the surface and an extreme lowered position where said spreader means is at a minimum height relative to the surface.

Claim 4

A machine as set forth in claim 2 wherein said positioning means further includes a pair of generally parallel links pivotally connected at first ends thereof to said body means and pivotally connected at second ends thereof to said shaft support, said links being connected to said lever arm for movement therewith.

Claim 5

A machine as set forth in claim 3 wherein said second wheel means includes a single dirigible wheel.

Claim 6

A machine as set forth in claim 4 wherein said first wheel means includes a pair of spaced wheels.

Claim 7

A machine as set forth in claim 5 wherein said reservoir means comprises a tank, said first ends of said links being pivotally connected to said tank for pivotal movement about a horizontal axis, said lever arm being pivotally connected to said tank for fore and aft movement along one side thereof, guide means secured to said one side of said tank for guiding movement of said lever arm and for retaining said lever arm in at least said extreme lowered position, a motor drive meAns disposed on the opposite extremity of said tank from said dirigible wheel and between said tank and said spreader means, said motor drive means being operatively connected to said pair of spaced wheels, said spreader means including a first and second scraper means with a rotatable spreader disposed therebetween, rotary agitator means disposed in said tank for mixing the fluid therein, a conduit extending from said tank to a valve disposed above said first scraper means, linkage means operatively connected to said valve and extending to a control lever pivotally supported on said tank for opening and closing said valve to selectively dispense fluid to said first scraper means, motion transmitting means operatively interconnecting said motor drive means and said agitator means and said rotatable spreader for rotating same, and power control means operatively supported by said tank adjacent said dirigible wheel and operatively connected to said motor drive means for controlling the direction and speed of movement of said machine.

Claim 8

A machine as set forth in claim 5 including a motor and a hydrostatic transmission, said hydrostatic transmission being operatively connected to said pair of spaced wheels, and power control means operatively supported on said body means adjacent said dirigible wheel and operatively connected to said hydrostatic transmission for controlling the direction and speed of said machine.