the following discussion describes in detail one embodiment of the invention . this discussion should not be construed , however , as limiting the invention to those particular embodiments since practitioners skilled in the art will recognize numerous other embodiments as well . for a definition of the complete scope of the invention , the reader is directed to the appended claims . turning to fig1 shown therein is an illustrative view of the present invention 10 in use . the present invention 10 , a personal descent jump suit , is designed for emergency evacuation from skyscrapers or tall buildings 12 . the suit is issued to the employee or a variety of sizes are stored at the evacuation point 14 of departure where an individual 16 will select the appropriate size and after donning their suit they will attach their descent device to the descent track which will safely guide them to the ground . the suits are made in various sizes because the descent device has a preselected drag brake mechanism for controlling their rate of descent . the descent device also has a hydraulic brake that is under the user &# 39 ; s 16 control to provide selective descent control in addition to the preselected suit designed brake mechanism . turning to fig2 shown therein is an illustrative view of the present invention 10 in use . shown is the present invention 10 being used by a user 16 in an emergency evacuation from a sky scraper or tall building 12 having a plurality of longitudinally extending i - beam shaped descent tracks 18 attached to the exterior thereof extending from top to bottom and being fabricated in a manner that allows for the attachment thereon of a personal descent assembly having a preselected first brake designed for the descent suit size and a second user controlled hydraulic brake control so that the user 16 may attach themselves to the descent track and descend to the ground by means of the first brake and user controlled second hydraulic brake to control their rate of descent down the side of the building 12 . turning to fig3 shown therein is an illustrative view of the present invention 10 . shown is the descent suit 20 of the present invention 10 being worn by a user 16 having a harness 22 forming an integral part of the suit 20 and descent assembly housing 24 . the suits 20 are made in various sizes that reflects a duty rating for the preselected drag brake control of the descent assembly 23 have a housing 24 that basically determines the descent rate of the suit wearer 16 during a descent session . the suits 20 can also be made to accommodate special needs such as the physically challenged and can be manufactured in various colors to indicate such . the descent device 23 also incorporates a second hydraulic brake that is under control of the user allowing the user 16 to stop or slow down as determined by the user . also shown are the brake control 26 , handle 28 , master cylinder 30 , upper hydraulic piston 32 , lower preselected piston 34 and harness cable 36 . turning to fig4 shown therein is an illustrative view of the present invention 10 . shown is one possible variation in suit 20 sizes being large 38 , medium 40 and small 42 . each suit has an integral harness 22 and descent device 23 that is attached to the suit harness by a cable 36 . each descent device 23 has two braking mechanisms . one brake mechanism is a preselected tension loaded brake that is tensioned according to the suit 20 size . larger suits 38 have a greater braking pressure than medium 40 or smaller 42 suits thereby controlling the descent rate . the second braking mechanism is a hydraulic brake having control means accessible to the user whereby the user can apply the hydraulic brake as the user deems necessary . turning to fig5 shown therein is a perspective view of the descent device assembly 23 . shown is the descent assembly 23 of the descent suit of the present invention having a preselected brake associated with a lower tension piston 34 wherein the pressure is calculated to apply a predetermined braking force determined by the weight of the individual as related to suit size . to insure the correct mating of a descent device 23 to the weight of the individual , the descent device 23 is fixedly mounted to a suit that is sized for the duty weight of the descent device 23 . in addition to the preselected tension brake a second hydraulic brake associated with upper piston 32 is provided whereby the user can selectively apply the hydraulic brake as needed . also shown are the hydraulic brake control 26 , handle 28 , master cylinder 30 , housing 24 , frictionous material 44 and harness cable 36 . turning to fig6 shown therein is a top view of the descent assembly device 23 . shown are the descent assembly 23 and descent assembly housing 24 of the present invention having two handles 28 for hand placement of the user during descent to allow for control of the user &# 39 ; s body and easy manipulation of the brake control 26 . the brake control 26 is attached to a master cylinder 30 that when activated produces pressure in the upper piston 32 to displace the inner piston into a position that allows the brake pad to engage the descent track to slow the user &# 39 ; s descent as they travel down the descent track . the lower tension piston 34 is associated with the preselected brake . the tension of the lower piston 34 coincides with the size of the jump suit that it is attached to . the bigger the jumpsuit harness the greater the pressure on the drag brake of the lower piston 34 . an attachment member 46 is fixedly attached to housing 24 and is for receiving the harness cable . turning to fig7 shown therein is a bottom view of the present invention 10 . shown are the bottom of the descent assembly 23 and its housing 24 having a structure whereby two opposing channels are formed by curved flanges 48 extending inwardly on the bottom side portions of the descent assembly 23 . also shown is the opposed channels having a frictionous material 44 lining that produces a reduced free fall speed of the descent assembly . additionally shown are a plurality of brake pads 50 , 51 that work in correlation with the upper and lower pistons respectively , to produce larger frictional coefficients on the descent track to further slow the user &# 39 ; s descent as desired . also shown are handle 28 , brake control 26 and attachment member 46 . turning to fig8 shown therein is a partial sectional view of the descent assembly 23 attached to a descent track 18 attached to the exterior wall of a tall building 12 . shown is the manner whereby the descent assembly 23 and its housing 24 of the present invention engages the descent track 18 when reduced descent speed is desired . the user slows their descent speed by manipulating the brake control 26 that causes the master cylinder 30 to pump increased amounts of brake fluid into the upper piston 32 and cylindrical housing 66 causing increased pressure between the brake pad 50 and the descent track 18 of the present invention producing an increased frictional coefficient that effectively slows the user &# 39 ; s descent . also shown are brake pads 51 , handle 28 , coil spring 52 for the preselected brake control , lower piston 34 and cylindrical housing 68 , frictionous material 44 , flange 48 , attachment member 46 and harness cable 36 . turning to fig9 shown therein is a lower end view of the descent assembly 23 and its housing 24 attached to a descent track 18 . shown is the descent assembly 23 having a semi - interior cavity 60 therein for receiving the i - beam descent track 18 therein , wherein the descent device 23 has frictionous material 44 positioned on the underside of the descent track 18 and brake pads and frictionous material 44 engaging the outer side face or connection bar 54 of the descent track 18 . the frictionous material 44 pad engaging the face 54 of the track 18 serve as a drag brake that slows the descent of the user depending on the preselected tension brake that is sized to the suit size which is related to the weight of the descending user . the second brake is hydraulic and is under the control of the descending user . handle 28 is also shown . the semi - interior cavity 60 is referred to as a “ semi ” because there is an open space between the two flanges 48 . the frictionous material 44 is disposed inside the semi - interior cavity 60 and is attached to the interior surface of the top side of the descent assembly housing 23 at 62 and the interior surface of the flanges 48 at 64 . turning to fig1 , shown therein is a bottom view of the drag brake release mechanism . shown is a bottom view of the descent device 23 with the flanges 48 shown in outline . the drag brake has a preselected tensioning coil 52 designed to force the brake pad 51 to engage the descent track face 54 with a pressure determined by the suit size which has a correlation to the weight of the individual wearing the suit . the drag brake release mechanism has a lever 56 , pivotable connection 70 , and a tab 58 that is positioned over the drag brake pad 51 whereby the descent mechanism 23 can be mounted to the end of the track 18 without the end of brake pad 51 contacting the top end of the track 18 and whereby the top end of the track 18 will automatically engage the drag brake release lever 56 moving the tabs 58 off of the drag brake pad 51 . once disengaged , the drag brake pad 51 will be free to move or be urged by tension spring 52 into engagement with the descent track face 54 . the tab 58 thickness is less than the distance moved by the drag brake pad 51 to engage the track 18 ; therefore , the tab 58 will not contact the descent track face 54 or otherwise interfere with the workings of the descent mechanism .
the present invention 10 discloses an emergency descent system for a tall building 12 . the high rise emergency descent system is comprised of at least one track 18 fixedly attached to the exterior of a building 12 and a jumpsuit 20 having an integral harness 22 and descent device 23 connected to the suit by means of a cable 36 that will allow the user 12 to don the apparel having a first preselected drag brake 52 designed for a weight class that is reflected in the size of suit , and , to attach the descent device 23 to the descent track 18 and descend to the ground at a controlled rate . a second brake control 26 is provided for allowing the user 16 more individual brake control during the descent down the building 12 .