Camera hoist with hydraulic riser

Claim 1

A CAMERA HOIST COMPRISING: A SUPPORTING BASE, A SWINGING FULCRUM PIVOTED ON SAID BASE, A BOOM PIVOTED MIDWAY BETWEEN ITS ENDS UPON SAID FULCRUM, A SLIDE PIVOT CONNECTION BETWEEN THE LOWER END OF SAID BOOM AND SAID BASE, MEANS FOR EFFECTING VERTICAL SWINGING MOVEMENT OF SAID BOOM BETWEEN A LOWERED POSITION AND AN ELEVATED POSITION, THE UPPER END OF SAID BOOM UNDERGOINING LINEAR MOVEMENT ALONG A NORMALLY VERTICAL DIRECTION LINE DURING SWINGING MOVEMENT OF SAID BOOM BETWEEN SAID POSITIONS, A CAMERA BASE PIVOTALLY MOUNTED ON SAID UPPER END OF SAID BOOM, LINKAGE MEANS OPERATIVELY CONNECTED BETWEEN SAID CAMERA BASE AND SAID SUPPORTING BASE FOR MAINTAINING SAID CAMERA BASE AT A FIXED ANGLE TO SAID DIRECTION LINE DURING SWINGING MOVEMENT OF SAID BOOM BETWEEN SAID POSITIONS, A CEMERA PLATFORM OVERLYING SAID CAMERA BASE, AND POWER OPERATED RISER MEANS OPERATIVELY CONNECTED BETWEEN SAID CAMERA BASE AND SAID CAMERA PLATFORM FOR EFFECTING VERTICAL MOVEMENT OF SAID CAMERA PLATFORM RELATIVE TO SAID CAMERA BASE ALONG A DIRECTION LINE PARALLEL TO SAID FIRST-MENTIONED DIRECTION LINE.