the third small gears 25 the diameter of the fourth small gear 29 is equal to those of the first and third small gears 16 and 25 reference numeral 30 represents an operation shaft which is equipped substantially at its center with a fitting hole 31 of a later appearing operation rod and which is stored in the vertical portion of the main shaft 2a and supported rotatably by a suitable bearing member 32 a key 31a is disposed inside the fitting hole 31 of the operation rod the fitting hole 31 of the operation rod is bored so that when the door 1 is closed the operation rod crosses the door 1 at right angles reference numeral 33 represents an operation rod which is equipped at its both end portions with knobs 34 34 and which is fitted slidably into the fitting hole 31 of the operation rod a key groove 33a into which the key 31a described above fits is formed on the operation rod 33 next the operation of the door appartus of the present invention having the above mentioned construction will be described when one approaches the door 1 he pulls the operation rod 33 towards him by gripping the knob 34 when he pushes the knob 34 towards the center of the door 1 while gripping it the operation shaft 30 rotates fig1 shows the state at this time in the drawing when the operation shaft 30 rotates the fourth small gear 29 fixed to it rotates clockwise in the direction represented by arrow and rotates counter clockwise the.