1 . the elevator compartment cabin displacement device ( see fig1 and 2 ) includes the frame ( 2 ) on its base ( 1 ), two compartment cabins ( 3 ) inside the frame . one compartment ( 5 ) is installed in each compartment cabin underneath which there is a hatch working as the entrance ( 6 ) of the compartment . there are at least two longitudinal guide rails ( 7 ) installed underneath each of the compartment cabins , and all the rails are connected rigidly on the upper surface of the base matching a set of longitudinal pulleys ( 8 ), therefore a longitudinal guide rail is positioned at a set of longitudinal pulleys . ( see fig3 and 4 ) the rotational shaft key ( 10 ) on the handle ( 9 ) is connected to the input shaft of the handled decelerator ( 11 ). the output shaft of the handle decelerator is connected to the main sprocket shaft ( 12 ). the handle , handled decelerator and the main sprocket are installed on the handle stand ( 13 ). the left - sprocket ( 14 ) and the right - sprocket ( 15 ) are installed on the left front side and the right front side of the handle stand , respectively . the handle stand is installed on the base , with the exactly same sprockets on each side , and each sprocket is smaller than the main sprocket . the front and base ends of the moving chain ( 17 ) are fixed at one of the guide rails , so that the part in - between meshes with the left - sprocket , the main sprocket and the right - sprocket accordingly . the base is installed at the edge of the building &# 39 ; s roof . in the rescue mode , pull the handle to make the main sprocket drive the chain moving outward , then the guide rail moves outward , and there movable compartment cabin moves outward until the two entrances go beyond the edge of the building &# 39 ; s roof , to descend the compartments . when the rescue ends , pull the handle backward to move the compartments inward back to the base . 2 . the anti - lock device between the steel rope track and the compartments . use rope tracks for ascending and descending of the compartments . the invention is an emergency rescue device , not common facility . therefore , the tracks are not rigidly fixed , but in a foldable manner . to prevent shifting of the rope tracks during the ascending and descending of the compartments , the anti - lick device between the steel rope track and the compartments is applied , it includes : ( see fig5 through 7 ) a u - beam ( 18 ) is installed at each side ( left and right ) of the compartment cabin and each u - beam has a dovetail - shaped bottom ( 181 ). several i - shaped pulleys ( 19 ) are installed at each side of each compartment , and the u - beams work as enclosed tracks of the pulleys . a flanged track ( 182 ) is installed at the outer surface of beam wall of each u - beam as a secondary track . an i - shaped hand wheel ( 20 ) is installed at the outer surface of the bottom of each u - beam . the starting end of the wire cable ( 21 ) is wound to an i - shaped pulley . the guide device ( 22 ) includes : ( see fig8 through 10 ) a hole ( 222 ) which is penetrated by the cable at the web of the upside - downe - t - shaped base ( 221 ), and a bearing pedestal ( 223 ) is installed at each side of the flange of the t - shaped base . an i - shaped pulley ( 224 ) is installed at each of the bearing pedestal , with the axial direction according to the direction of the web of the base . the guide device is at the top of the uppermost i - shaped pulley , the two flanged tracks mesh with the two i - shaped pulleys , respectively , so the guide device across from one of the secondary track to the other . the steel rope track uncoils from the i - shaped pulley hand wheel , meshes with the fixed pulley ( 23 ) on the u - beam , penetrates through the hole on the guide device , and meshes with several pulleys one by one from top to bottom . attach a hook ( 211 ) at the end of each steel rope for to hook with a hook fixed on the ground . when the elevator compartment cabin displacement device displaces the cabins until the entrances completely move beyond the edge of the building &# 39 ; s roof , the four steel tope tracks need to be put down and fixed to the ground : rotate the four i - shaped hand wheels to make the four tracks shift down to the hooks on the ground , hook the hooks at the ends of the tracks to the hooks fixed on the ground , that way enclosed space is created between the u - beam and the i - shaped pulleys to prevent shifting of the steel rope tracks . 3 . in the compartment pulling system , the driving wheel ( 24 ) key is connected to the main shaft , ( see fig1 through 13 ) and the driving wheels of the deceleration damping device a ( 25 ) includes accelerating transmission ( 26 ) and a load wheel ( 27 ) which is installed on the outer collar of the bearing ( 263 ) of the output bearing ( 261 ) of the transmission . the load wheel includes axial round eaves ( 271 ) on its circumference and two fan - shaped friction plates ( 272 ) whose centers overlap with each other on the plate base ( 274 ) and connected with two springs ( 273 ). the outline of the plate base fills the gap between the two friction plates . the plate base key - joins to the output shaft of the transmission . there is space between the edge of the plates and the eave . the input shaft ( 262 ) of the transmission is key joined to the input gear ( 28 ), which meshes the connecting gear ( 30 ) on the main shaft ( 29 ). when the main shaft rotating speed which is also the descending speed of the compartment is normal , the rotating speeds of the plate base and the two friction plates are normal . the springs in - between pulling the two friction plates keep the plates still , so that the load wheel is still on the bearing pedestal . when the main shaft rotating speed which is also the descending speed of the compartment is too high , through the transmission , increase the speed of the friction plates . under the centrifugal force , the plates overcome the pulling force from the springs and move outward toward the eave . the friction between the eave and the plates rotate the load wheel to increase the system loading , limit the increase of the rotating speed of the main shaft , and slow down the rotation . 4 . in the compartment pulling system , the so called two pairs of free pulleys ( 4 ) fixed on the top of the compartment is installed crosswise ( see fig1 ) in order to keep the compartment leveled during the ascending and descending . 5 . pre - release one of the compartments devices . the non - operating state ( not in use ) of the invention is that the two compartments are still in the cabin . the operating state of the invention is that one of the two compartments is up and the other is down . they are counter - weight of each other . therefore , after releasing one of the compartments , compartment a , to the ground , the invention gets into operation . the pre - release one of the compartments device includes : in the compartment pulling system , the shaft of the coiling wheel ( 31 ) key joins to the gear a , gear a meshes with the input gear of the transmission of the deceleration damping device b ( 33 )( same as the deceleration damping device a ). the pre - release one of the compartments device also includes a manual switches with one switch for each compartment . each switch includes : a up - side - down l - shaped hook ( 34 ) installed at the top of each compartment , a j - shaped lever hook ( 35 ) pin joined at the ceiling of the compartment cabin , the locations of the j - shaped hooks matching with the locations of the l - shaped hooks . the load point of a lever pulling bar ( 36 ) is pin - joined to a connecting bar ( 37 ), and the other end of the connecting bar connects to the effort point of the j - shaped lever hook . when the invention is not in operation , every compartment cabin hook hooks with its corresponding compartment hook , and both compartments are fixed inside the compartment cabin . after the hooks at the ends of the four steel ropes hook with the corresponding ground hooks , release the compartment a first . to release compartment a , push the bottom of the lever on the compartment a outward , then the upper part of the lever will pull the top of the connecting bar and the compartment cabin hook inward , then the compartment cabin hook will move outward , separating from with compartment hook . the i - shaped pulleys at the sides of the compartment a move downward in gravity according to the u - beam track . when the i - shaped pulleys leave the u - beam , the guide device is stuck at the dovetail bottom of the u - beam . the i - shaped pulleys continue to move to the ground . in the whole descending process of the compartment a , its coiling wheel rotates to release the rope . the gear a on the coiling wheel drives the input gear of the decelerating damping device transmission . the decelerating damping device works to prevent the high descending speed of the compartment a . the switches designed to be manual is also to prevent false switching that makes the compartment fall by mistake . when the evacuees ride on compartment b in descending , the compartment a is in ascending . when the compartment a ascends to the bottom of the u - beam track , the guide device guides the i - shaped pulleys of the compartment a into the u - beam track . getting into the track , the compartment a continues to ascend , with the guide device on its top , to the compartment cabin , which is the same as the compartment b . 6 . to operate safely , the invention includes a speed limit brake device . ( see fig1 ) install a speed meter ( 39 ) on any of the fixed pulleys ( 38 ) in the compartment pulling system . the pulley key joins with its shaft . the shaft ( 40 ) of the fix pulley and the inner collar of the shaft ( 41 ) fit perfectly . the bearing is installed on the pedestal . the driving bearings ( 391 ) of the speed meter is rigidly connected to the bearings of the fixed pulleys . the speed meter set as the limit speed is smaller than the braking speed . fix a speed limit reed switch ( 42 ) at the speed limit calibration and a brake reed switch ( 43 ) at the braking calibration . the needle ( 44 ) on the meter is magnetic . ( see fig1 ) install a large dc electromagnetic brake ( 45 ) on the main shaft ( 29 ). as its large braking force , it is used as a breakage . install a small dc electromagnetic brake ( 46 ) on the main shaft ( 29 ). as its small braking force , it is used as a speed limiter . the speed limit reed switch works as a switch connecting into the control circuit of the small dc electromagnetic brake which is the speed limiter , and the brake reed switch works as a switch connecting into the control circuit of the large dc electromagnetic brake which is the breakage . when the rotating speed reaches the pre - set limit speed , the magnetic needle in the meter points to the speed limit calibration , turning the speed limit reed switch off . after the power is cut off , the speed limiter stops the shaft . when the device is out of order , the rotation speed increases instead of decreasing , and the needle points to the braking calibration turning the brake reed switch off . after the power is cut off , the breakage stops the shaft , and the whole system stops running . 7 . the floor selecting device includes ( see fig1 ): the main shaft ( 29 ) driving the screw ( 48 ) through the sprocket transmission system ( 47 ), several travel switches ( 49 ) installed along the axial direction of the screw . all the travel switches are connected into the control circuit of the breakage in parallel . install bolt caps ( 50 ) on the screw as link stoppers of the travel switches . the distance a bolt cap travels between two adjacent travel switches corresponds to the distance the compartment travels between two adjacent floors . the number of the travel switches equals to the number of floors . every travel switch has its corresponding floor . after the button is pressed to choose an actual floor to stop , the corresponding travel switch receives the signal , the link stopper bumps with the travel switch , the travel switch is cut off to make breakage stop the main shaft , and the compartment stops at the selected floor .