referring initially to fig1 , 6 , 7 and 11 - 13 of the drawings , in a preferred embodiment the cantilever umbrella of this invention is generally illustrated by reference numeral 1 in fig1 and 2 . the cantilever umbrella 1 includes a base 2 which , as illustrated in fig6 and 7 , is characterized by a typically concrete rectangular base block 2 a . a rectangular base plate 3 is mounted on the upper surface of the base block 2 a , typically by means of multiple anchor bolts 4 which extend through the base plate 3 at respective corners thereof and as illustrated in fig6 extend downwardly into the base block 2 a with the hex head 5 of each anchor bolt 4 engaging the upper surface of the base plate 3 . a tubular post seat 6 , illustrated in longitudinal cross - section in fig7 extends vertically through the base block 2 a beneath the base plate 3 . the cantilever umbrella 1 further includes an elongated support post 13 , the vertical segment 13 a of which extends through a post opening ( not illustrated ) provided in the base plate 3 and is rotatably mounted in the post seat 6 . as illustrated in fig1 - 13 , a circular post lock collar 11 , fitted with a pair of diametrically - opposed post lock flanges 12 , is typically welded or otherwise mounted on the vertical segment 13 a of the support post 13 and typically engages the upper surface of the base plate 3 when the vertical segment 13 a of the support post 13 is inserted in the post seat 6 as illustrated in fig7 . the vertical segment 13 a of the support post 13 further extends through the plate opening 9 of a rectangular lock plate 7 , slidably mounted on the vertical segment 13 a at the plate opening 9 . the plate opening 9 is provided with multiple plate notches 10 , and a pair of handles 8 is typically provided on the upper surface of the lock plate 7 , the purpose of which plate notches 10 and handles 8 will be hereinafter described . accordingly , the lock plate 7 is capable of resting on the upper surface of the base plate 3 of the base 2 with the post lock flanges 12 of the post lock collar 11 ( mounted on the vertical segment 13 a of the support post 13 , fig1 ) inserted in respective companion plate notches 10 of the lock plate 7 and the lock plate 7 fitted between the respective pairs of spaced - apart heads 5 of the anchor bolts 4 as illustrated in fig1 and 13 , to prevent inadvertent rotation of the support post 13 in the post seat 6 ( fig7 ) of the base 2 . the support post 13 can be unlocked in the base 2 for selective rotation in the post seat 6 , as desired , by lifting the lock plate 7 from the base plate 3 using the handles 8 to disengage the plate notches 10 from the post lock flanges 12 of the post lock collar 11 , and slightly rotating the lock plate 7 and resting diagonally - opposed corners of the lock plate 7 on the hex heads 5 of the respective anchor bolts 4 , as illustrated in phantom in fig1 . referring again to fig3 , 8 , 9 , 10 and 14 and initially to fig1 and 2 of the drawings , an angled segment 13 b extends from the vertical segment 13 a of the support post 13 at a post bend 13 c . as illustrated in fig8 the angled segment 14 b of a support arm 14 , including a vertical segment 14 a joined to the angled segment 14 b at an arm bend 14 c , is joined to the angled segment 13 b of the support post 13 typically by means of an elongated post coupling 15 . accordingly , respective ends of the post coupling 15 are inserted in the larger - diameter angled segment 13 b of the support post 13 and angled segment 14 b of the support arm 14 . bolts 19 are extended through respective post bolt openings 13 d provided in the angled segment 13 b of the support post 13 and respective arm bolt openings 14 d provided in the angled segment 14 b of the support arm 14 , and through registering coupling bolt openings 15 a provided in the post coupling 15 , and nuts 19 a are threaded on the respective bolts 19 . alternatively , it is understood that the support post 13 can be constructed in one piece with the support arm 14 , as desired , according to the knowledge of those skilled in the art . a cylindrical canopy support sleeve 17 , the purpose of which will be hereinafter described , is mounted on the descending vertical segment 14 a of the support arm 14 , typically by extending a bolt 19 through a pair of aligned , diametrically - opposed bolt openings 17 a provided in the canopy support sleeve 17 and through registering bolt openings 16 provided in the vertical segment 14 a of the support arm 14 , and threading a nut 19 a on the bolt 19 . as further illustrated in fig8 multiple connector rods 18 are typically welded or otherwise fixedly attached to the canopy support sleeve 17 , and extend outwardly therefrom in spaced - apart relationship with respect to each other around the circumference of the canopy support sleeve 17 . as illustrated in fig1 , each connector rod 18 is typically characterized by a first rod segment 18 a which is welded or otherwise mounted on the canopy support sleeve 17 , a second rod segment 18 b which extends from the first rod segment 18 a in substantially perpendicular relationship thereto and a third rod segment 18 c which extends from the second rod segment 18 b in substantially perpendicular relationship thereto and with respect to the first rod segment 18 a . as illustrated in fig1 , an elongated canopy support rib 21 , typically constructed of aluminum square tubing , is pivotally mounted on each connector rod 18 , typically by extending the third rod segment 18 c ( fig1 ) of each connector rod 18 through a rod opening 21 a provided in the corresponding canopy support rib 21 and fitting a conventional rod cap ( not illustrated ) or other suitable fastener which is known to those skilled in the art on the end of the third rod segment 18 c of the connector rod 18 to secure the canopy support rib 21 on the connector rod 18 . as illustrated in fig1 and 2 , a canopy 39 , typically constructed of a selected durable fabric material having a selected color pattern and design , is mounted on the canopy support ribs 21 according to the knowledge of those skilled in the art . as illustrated in fig9 a strut connector hook 23 extends from one end of an elongated spreader strut 22 , typically constructed of aluminum square tubing , and each spreader strut 22 is pivotally attached to the corresponding canopy support rib 21 by extending the strut connector hook 23 through a rod opening 21 a which is provided at substantially the midpoint of the corresponding canopy support rib 21 , as illustrated in fig4 . the opposite end of each spreader strut 22 is pivotally attached to a corresponding connector rod 18 , as illustrated in fig1 , multiple ones of which connector rods 18 are typically welded to a cylindrical strut support sleeve 24 and extend therefrom in spaced - apart relationship to each other about the circumference of the strut support sleeve 24 , in the same manner as heretofore described with respect to the canopy support sleeve 17 illustrated in fig8 . accordingly , the third rod segment 18 c ( fig1 ) of each connector rod 18 is extended through a connector rod opening 22 a of the spreader strut 22 , as illustrated by the dashed lines in fig1 , and a rod cap ( not illustrated ) or other suitable fastener known to those skilled in the art is fitted on the third rod segment 18 c to secure the spreader strut 22 on the connector rod 18 as heretofore described with respect to the canopy support sleeve 17 illustrated in fig1 . as further illustrated in fig1 , a pulley 33 , the purpose of which will be hereinafter described , is mounted on an elongated pulley mount shaft 35 , typically by means of a pulley mount bolt 36 which is extended through a mount bolt opening 33 a provided in the pulley 33 and through a registering shaft bolt opening 35 a , provided in the pulley mount shaft 35 . the pulley 33 is mounted on the strut support sleeve 24 , typically by means of a circular shaft plate 36 which is typically welded to the bottom edge of the strut support sleeve 24 and is provided with a central shaft opening ( not illustrated ) through which the pulley mount shaft 35 extends , and the pulley mount shaft 35 is welded to the shaft plate 36 and extends upwardly through the strut support sleeve 24 . as illustrated in fig3 a safety pin 25 is typically extended through a safety pin opening 24 a provided in the strut support sleeve 24 , and through a registering pin opening ( not illustrated ) provided in the pulley mount shaft 35 to further secure the pulley mount shaft 35 on the strut support sleeve 24 . referring again to fig3 - 5 and initially to fig8 of the drawings , a winch spool 29 , fitted with a winch crank 30 , is rotatably mounted between a pair of parallel winch mount brackets 27 , mounted on the vertical segment 13 a of the support post 13 typically by means of bracket mount bolts 28 and respective nuts 32 . a cable 31 , one end of which is attached to the winch spool 29 as illustrated in fig4 enters the support post 13 through a cable opening 31 a provided in the vertical segment 13 a thereof as illustrated in phantom in fig5 the cable 31 further extends through the bend 13 c and angled segment 13 b in the interior of the hollow support post 13 and through the post coupling 15 ( fig8 ), and downwardly from the vertical segment 14 a of the support arm 14 through the open bottom end thereof . the cable 31 further extends through the pulley 33 ( mounted on the strut support sleeve 24 ), as illustrated in phantom in fig3 and loops upwardly and re - enters the vertical segment 14 a of the support arm 14 , as illustrated in fig5 where the cable 31 typically terminates in a cable loop ( not illustrated ) which is typically bolted or otherwise attached to the support arm 14 , inside the hollow vertical segment 14 a thereof accordingly , in application of the cantilever umbrella 1 as hereinafter described , the canopy support ribs 21 and mounted canopy 39 ( fig1 ) are deployed from the closed configuration illustrated in fig4 and 5 to the open , shielding configuration illustrated in fig1 and 2 , by rotating the winch crank 30 to wind the cable 31 on the winch spool 29 as the winch spool 29 rotates between the winch mount brackets 27 . this action draws the cable 31 through the pulley 33 whole the end of the cable 31 opposite the winch spool 29 remains attached to the interior of the support arm 14 , and the shortening cable 31 thus raises the pulley 33 and the attached strut support sleeve 24 . consequently , the spreader struts 22 pivot outwardly in concert on the rising strut support sleeve 24 at the respective connector rods 18 ( fig5 ), and push the respective attached canopy support ribs 21 upwardly as the canopy support ribs 21 pivot outwardly in concert on the canopy support sleeve 17 at the respective connector rods 18 and on the spreader struts 22 at the respective strut connector hooks 23 . the canopy 39 is deployed in the closed configuration , as desired , by unwinding the cable 31 from the winch spool 29 by opposite rotation of the winch crank 30 , thereby causing the combined weights of the strut support sleeve 24 and pulley 33 to pull downwardly on the lengthening cable 31 at the pulley 33 , and the spreader struts 22 to pivot upwardly in concert on the strut support sleeve 24 and pivot on the canopy support ribs 21 , and the canopy support ribs 21 to pivot downwardly in concert on the canopy support sleeve 17 , as hereinafter further described . referring again to fig1 , 4 and 11 - 13 of the drawings , in typical application of the cantilever umbrella 1 the closed canopy 39 is initially positioned at a selected location in an imaginary circle which is defined by the orbit of the canopy 39 around the support post 13 by rotating the support post 13 in the post seat 6 ( fig7 ) of the base 2 . accordingly , the support post 13 is unlocked for rotation in the base 2 by grasping the handles 8 and initially lifting the attached lock plate 7 , resting on the base plate 3 of the base 2 between the hex heads 5 of the respective anchor bolts 4 as illustrated in fig1 , from the upper surface of the base plate 3 to disengage the plate notches 10 from the respective post lock flanges 12 of the post lock collar 11 , as illustrated in fig1 . while the post lock flanges 12 remain clear of the plate notches 10 of the lock plate 7 , the lock plate 7 is slightly rotated on the support post 13 , and diagonally - opposed corners of the lock plate 7 are rested on the hex heads 5 of the respective anchor bolts 4 , as illustrated in phantom in fig1 . accordingly , as indicated by the double - headed arrow in fig1 the support post 13 is capable of rotating in the post seat 6 ( fig7 ) of the base 2 in order to facilitate positioning of the canopy 39 at any position in the imaginary circle defined by the orbit of the closed canopy 39 with the rotating support post 13 around the base 2 . when the desired positioning of the canopy 39 is achieved , the support post 13 is locked in the base 2 to prevent inadvertent rotation of the support post 13 in the post seat 6 . this is accomplished by repositioning the lock plate 7 as indicated by the solid lines in fig1 to align a diametrically - opposed pair of the plate notches 10 of the lock plate 7 with the respective post lock flanges 12 of the post lock collar 11 , and then lowering the lock plate 7 to rest on the base plate 3 while extending the post lock flanges 12 through the respective plate notches 10 . it will be appreciated by those skilled in the art that rotational pressure applied to the support post 13 in either direction in the base 2 , such as wind pressure applied to the canopy 39 , will be resisted by the lock plate 7 , since the post lock flanges 12 engage the lock plate 7 at the plate notches 10 , and this action causes the corresponding pair of diagonally - opposed corners of the lock plate 7 to engage the hex heads 5 of the respective pair of anchor bolts 4 , as illustrated in fig1 and 13 . the canopy 39 of the cantilever umbrella 1 is next opened as heretofore described with respect to fig4 and 5 , by rotating the winch crank 30 to wind the cable 30 on the winch spool 29 and lift the strut support sleeve 24 by operation of the pulley 33 and deploy the canopy support ribs 21 and spreader struts 22 from the closed configuration illustrated in fig4 and 5 to the open configuration illustrated in fig1 and 2 . conversely , the canopy 39 is closed by rotating the winch crank 30 in the opposite direction to unwind the cable 30 from the winch spool 29 and deploy the canopy support ribs 21 and spreader struts 22 from the open configuration illustrated in fig1 and 2 to the closed configuration illustrated in fig3 and 4 , as heretofore described . while the preferred embodiments of the invention have been described above , it will be recognized and understood that various modifications can be made in the invention and the appended claims are intended to cover all such modifications which may fall within the spirit and scope of the invention .
a cantilever umbrella characterized by a folding canopy which is mounted in cantilever fashion on a support post rotatably mounted in a base and can be positioned at a selected location in the orbit of the canopy around the support post for shelter against rain or sunlight . in a preferred embodiment a support arm extends in angular relationship from the support post . a canopy support sleeve is mounted on a descending segment of the support arm , and multiple canopy support ribs which support the canopy are pivotally mounted on the canopy support sleeve in radially - extending relationship therefrom . multiple spreader struts are pivotally attached at one end of each to the corresponding canopy support rib , and the other end of each spreader strut is pivotally mounted on a common strut support sleeve . a winch is mounted on the support post and a cable attached to the winch engages a pulley provided on the strut support sleeve . the canopy of the umbrella is deployed in the open configuration by winding the cable on the winch and thus causing the cable to lift the pulley and attached strut support sleeve as the spreader struts pivot outwardly on the strut support sleeve and respective canopy support ribs and the canopy support ribs pivot outwardly on the canopy support sleeve . a specially - designed lock mechanism is provided on the support post for selectively engaging the base and preventing inadvertent rotation of the support post in the base .