Desk having elevatable storage cabinet

Claim 1

A DESK COMPRISING, A BASE, A TOP CONNECTED TO SAID BASE, SAID TOP HAVING A RECTANGULAR OPENING, AT LEAST TWO GUIDE SHAFTS VERTICALLY MOUNTED TO SAID TOP AND EXTENDING DOWNWARDLY THEREFROM, SAID SHAFTS MOUNTED ADJACENT TO DIFFERENT CORNERS OF SAID TOP, A RECTANGULAR CABINET HAVING HORIZONTAL DIMENSIONS GENERALLY CO-EXTENSIVE WITH SAID OPENING IN SAID TOP, SAID CABINET SLIDABLY SECURED TO SAID GUIDE SHAFTS BY GUIDE BRACKETS SECURED TO SAID CABINET AND ENCIRCLING SAID SHAFT, AN ELECTRIC MOTOR MOUNTED TO SAID DESK, SAID MOTOR HAVING TWO DRIVING DIRECTIONS, AN OUTPUT SHAFT OPERABLY CONNECTED TO SAID MOTOR AND ROTATED THEREBY, A PLURALITY OF PULLEYS, AT LEAST FOUR OF WHICH ARE AXIALLY SECURED TO SAID OUTPUT SHAFT, AND ROTATABLE THEREWITH, AND AT LEAST FOUR OF WHICH ARE SECURED TO THE BASE OF SAID DESK ABOVE SAID OUTPUT SHAFT, SAID PULLEYS BEING AXIALLY ROTATABLE IN A VERTICAL PLANE, A PLURALITY OF CABLE RECEIVING BRACKETS MOUNTED TO SAID CABINET AT A BOTTOM CORNER THEREOF, SAID CABLES EACH PASSING OVER A PULLEY MOUNTED TO SAID BASE SO THAT ROTATION OF SAID OUTPUT SHAFT IN A FIRST DIRECTION WINDS SAID CABLES AROUND SAID PULLEYS AND RAISES SAID CABINET AND A SUBSEQUENT ROTATION IN AN OPPOSITE DIRECTION UNWINDS SAID CABLES FROM SAID PULLEYS AND LOWERS SAID CABINET, AN ELECTRICAL RAISING SWITCH MOUNTED TO SAID BASE AND OPERABLY CONNECTED TO SAID MOTOR FOR ACTUATION THEREOF IN SAID FIRST AND OPPOSITE DIRECTIONS, AN ELECTRICAL LIMITING SWITCH MOUNTED TO SAID BASE FOR HALTING THE UPWARD MOVEMENT OF SAID CABINET, ABUTMENT MEANS ON SAID CABINET ENGAGEABLE WITH AND ACTUATING SAID LIMITING SWITCH SO THAT WHEN SAID CABINET CARRIES SAID ABUTMENT MEANS INTO ENGAGEMENT WITH SAID LIMITING SWITCH, SAID SWITCH IS ACTUATED AND THE UPWARD MOVEMENT OF SAID SHELF IS HALTED, AT LEAST ONE DOWN LIMIT SWITCH MOUNTED TO AND BELOW SAID TOP ADJACENT TO THE FRONT OF SAID OPENING, SAID SWITCH HALING THE DOWNWARD MOVEMENT OF SAID SHELF WHEN ACTUATED, AN ACTUATOR BAR OPERABLY CONNECTED TO SAID DOWN SWITCH SAID BAR BEING SPRING BIASED AND EXTENDING BEYOND THE PLANE OF SAID TOP WHEN SAID SHELF IS MOVED UPWARDLY ABOVE SAID TOP, SAID BAR WHEN DEPRESSED ACTUATING SAID DOWN SWITCH AND HALTING DOWNWARD MOVEMENT OF SAID SHELF, AND MEANS ON SAID CABINET FOR ENGAGING AND OPERATING SAID DOWN SWITCH WHEN SAID CABINET HAS ATTAINED ITS LOWERMOST POSITION.