in fig1 , a seat assembly 12 of the present invention is shown in partial cross section . the seat assembly primarily comprises a seat 60 , an elevation mechanism 13 , and a mounting structure 17 . the elevation mechanism includes an inner post 14 and an outer post 16 , which telescope in relation to one another . the inner post 14 extends downward into the mounting structure , including a sleeve 18 , which is securely affixed to a fiberglass boat deck 20 . for greater stability , a plate 22 may be welded to the inner post 14 and bolted to the deck 20 . the outer post 16 is slidably positioned over the inner post 14 and is equipped with a longitudinal slot 24 . a pin 26 is attached to the inner post 14 and rides in the slot 24 of the outer post 16 , thus allowing the outer post 16 to slide up and down but preventing it from rotating on the inner post 14 . slip rings 15 are mounted on the top outer surface of the inner post 14 and ride on the inside surface of the outer post 16 to reduce friction between the two posts as the seat 60 is run up and down . the top of the inner post 14 defines a cap 19 with a hole 21 through it . a screw or spindle 28 extends through the hole 21 and runs up to a gear box 30 of a worm gear that is driven by a prime mover 32 , described hereinafter as a motor 32 , although the primer mover may also be a hydraulic or pneumatic power source , or even a manually operated prime mover . a nut 34 , which is threadedly engaged with the screw 28 , is mounted onto the upper end of inner post 14 . a motor 32 and a gear box 30 are mounted between a motor mounting plate 38 and a hold down plate 36 . the plates 36 and 38 are joined together by bolts 40 and serve to clamp the motor gear box 30 in a position fixed to the upper end of the outer post 16 . a spacer 42 holds the gearbox 30 and the spindle 28 in a position concentric with the nut 34 and the inner post 14 . thus , in this preferred embodiment , the motor and gear box are located between the seat 60 and the top of the outer post 16 . the seat 60 is secured to the assembly with a seat swivel 50 . the seat swivel is mounted on top of the plate 36 . details of the seat and seat swivel are described below in relation to fig3 . surrounding the lower end of the outer post 16 is a foot platform 70 , comprising a pair of platform halves 72 and an under carriage 74 . the under carriage 74 engages a sleeve 76 which is secured to the outer surface of the outer post 16 . the sleeve 76 also includes an outwardly extending plate 78 which provides vertical support for the foot platform 70 . a foot operated remote control device 90 , described in greater detail below , is preferably mounted on the platform 70 where it can be easily reached by the angler &# 39 ; s foot . the sleeve 76 can be raised along with the platform halves 72 to a position that is higher and closer to the seat 60 , if a person with shorter legs prefers to do so . to hold the foot platform at a desired distance below the seat 60 , a pin 80 engages a selected hole 82 in the wall of the outer post 16 . details of the platform are described below in relation to fig5 and fig6 . in the preceding description in respect of fig1 , the seat 60 is illustrated in a lowered or “ down ” position . fig2 shows the seat 60 in a partially raised position . the remote control 90 has been activated , as illustrated by an arrow 91 , showing that the foot pedal has been depressed . activation of the control 90 energizes the motor 32 , which actuates the gear box 30 . the motor 32 thus rotates the spindle 28 and the spindle raises the seat 60 as it turns within the nut 34 . note that the foot platform 70 , in its desired selected position relative to the seat 60 , also rises along with the seat , as illustrated by an arrow 93 . further details of the seat and the seat swivel are illustrated in fig3 and fig4 . as previously described , the seat swivel is mounted on top of the plate 36 . the seat swivel 50 comprises a hold - down plate 51 , a swivel plate 52 and a seat hinge plate 53 . the plates 52 and 53 , including the seat 60 coupled to the plates , are capable of rotating relative to the hold - down plate 51 . teflon wafers 54 are therefore placed between the moving surfaces between the plates 51 and 52 to reduce friction . near the rear of the seat 60 , a hinge 55 is provided to connect the seat 60 to the plate 53 to allow change of the seat &# 39 ; s inclination , which is accomplished by an adjustment nut 56 and spindle 57 . the spindle 57 is attached to the underside of a seat plate 62 . the seat plate 62 , along with a back plate 64 ( fig4 ) are preferably made from a hard material such as wood or plastic , and are covered by a cushioning material 66 . the seat 60 includes a seat area 69 which defines a recess 68 on either side of the seat 60 , which allows an angler to hold onto the seat with his inner thighs when he chooses to stand up to gain an even more elevated view . fig5 and fig6 show further details of the foot platform 70 in a top view . the platform 70 is split in two halves 72 for easy installation and removal from the elevation assembly described above . the halves 72 are provided with cut - outs 73 for clearance around a mounting plate 78 . each half 72 rests on an undercarriage 74 , which has extending arms 75 for the connection to the plate 78 . as illustrated in fig6 , the extending arms 75 terminate in hook - shaped ends 75 a which can be inserted into a pair of spaced - apart holes 79 formed in the plate 78 . the entire foot platform half 72 can then be lowered as shown in fig6 by an arrow 77 , until the extending arms 75 come to rest on the plate 78 . fig7 through fig1 show details of a presently preferred foot - operated remote control transmitter 90 . the transmitter mainly comprises two u - shaped halves 91 and 92 , which are pivotally connected by a pin 93 . in the center of the inner bottom of half 92 is mounted an electronic switch or transmitter 94 , which is held in position by a pair of opposing clamps 95 . trigger buttons 96 and 98 protrude from the top surface of the electronic transmitter . resting on these buttons are leaf springs 100 and 101 by their center portions 100 a and 101 a . one end of these leaf springs is spot - welded to the bottom 92 , while the other end touches the underside of the upper assembly half 91 . when pressure p is applied to either side of the assembly , as illustrated in fig1 , the upper half tilts down , exerts pressure on either leaf spring , which in turn presses down on either trigger button 96 or 98 of the electronic transmitter 94 , sending out a signal to a receiver , which initiates power supply to motor 32 , as described in more detail below . the electronic transmitter 94 contains a battery , which has to be replaced periodically . this is made easy by removing a retainer spring 102 ( fig9 ) and the pivot pin 93 to separate the two halves 91 and 92 . this allows access to the transmitter 94 , which has to be pulled out from under the clamps 95 , disassembled and furnished with a fresh battery . it should also be understood that a hardwired connection may be provided from the foot operated control to the motor 32 , if desired . fig1 illustrates a preferred electric circuit for supplying dc power to the motor 32 . those of skill in the art will appreciate that the wiring illustrated in fig1 will be assembled to the structure illustrated in fig1 et seq . either inside or outside the elevation mechanism 13 as desired . the circuit includes a receiver 110 , which receives one of two possible signals from the electronic transmitter 94 , which causes the receiver to supply power from a battery 115 to one of two relays 111 or 112 . preferably , the battery 115 is located in an easily accessible compartment below the level of the deck 20 , and wiring is run inside or outside the elevation mechanism to the motor 32 . in the illustrated embodiment , the relay 111 is activated , supplying power to the motor 32 for a clockwise rotation . if the relay 112 is activated by the other signal from transmitter 94 , dc power to the motor 32 is reversed , causing it to rotate the screw 28 in the opposite or counter - clockwise direction , thereby reversing the motion of the seat 60 from “ up ” to “ down ” or vice versa . fig1 illustrates an alternative embodiment of the present invention wherein a motor 200 is located at the bottom of the elevation mechanism . in this embodiment , the motor 200 is located beneath a foot platform 222 , which preferably comprises two platform halves , as shown and described below . this way , the motor 200 is not in the way when a person , sitting on a seat 206 , is rotating around on the swiveling seat . to accommodate the location of the motor beneath the foot platform , a spindle 202 extends above the motor 200 . the spindle 202 is rotated by the motor through a gear box 201 and the rotation of the spindle 202 pushes a nut 204 upwards . by rotating the spindle 202 through the nut 204 , the nut moves in an upward or downward direction ( depending on the direction of rotation of the spindle 202 ), and since the nut 204 is mechanically coupled to an inner tube 208 , the inner tube 208 moves up and down with the nut 204 . the upper end of the tube 208 is connected to an outer tube 210 through a swivel head 212 . the motor 200 is mounted to a motor housing 216 , and the motor housing 216 extends to a stanchion tube 214 . thus , the stanchion tube 214 remains stationary , along with the motor housing , when the spindle 202 is rotated . the stanchion tube 214 is equipped with a keyway 218 , in which rides a key 220 that is part of the outer tube 210 . this way , none of the tubes can rotate while the spindle 202 rotates . fig1 shows the foot platform 222 partially raised to clarify the motion of the individual parts . note that the nut 204 has moved up , staying approximately level with the foot platform , while the tubular elements have telescoped upward . in this way , the seat 206 can be raised in height ( at the “ all the way up ” position ) by slightly less than twice the length of the outer tube 210 . returning briefly to fig1 , the presently preferred embodiment also includes a removable backrest 224 . rather than the unitary structure depicted in fig1 , the backrest 224 , is mounted to a seatback mounting plate 225 , which slides into a receiving bracket 227 and is held there with bolts or the like ( not shown ). in this embodiment , the backrest can thus be removed and stowed away , leaving a backless stool for the use of the angler , if desired . as shown in fig1 , a distance d defines the height of the foot platform above a boat deck 226 . this distance is preferably roughly about the height of a typical stair riser , or about 8 inches , even though the motor takes up additional space beneath the foot platform in this embodiment . to help in this specification , the suspension of the foot platform is preferably changed slightly . support arms 228 are positioned underneath a platform 230 , as illustrated in more detail in fig1 , 15 , and 16 . the support arms 228 rest in a set of hinge grooves 234 of the platform 230 by way of hinge pins 232 . an extension 236 of a support arm 228 protrudes upwards through an aperture 238 in the platform 230 . when both halves of the platform 222 are in place , all extensions 236 are in line , and a set of holes 242 in these extensions line up so that a safety or cotter pin 244 can be installed , preventing an accidental upward tilting of the platform halves , such as for example when someone steps on a platform half at a point between the hinge pins 232 and the center split of the platform . the holes 242 in the upward protrusions 240 of platform 230 accommodate the pins 242 . removing these pins 242 allows the platform halves 222 to be rotated up , as illustrated on the left side of fig1 . the halves can be leaned against tube 210 as illustrated , when it is desirable to have more walking space around the chair , or they can be removed altogether by just lifting them up . fig1 further shows a recessed area 250 which serves to accommodate foot control devices for the commonly used trolling motors . inward extensions 252 keep the foot control in place , while leaving an open space 254 for electrical wires 256 going to the trolling motor and the boat battery . the principles , preferred embodiment , and mode of operation of the present invention have been described in the foregoing specification . this invention is not to be construed as limited to the particular forms disclosed , since these are regarded as illustrative rather than restrictive . moreover , variations and changes may be made by those skilled in the art without departing from the spirit of the invention .
a seat for a fishing or bass boat can be raised or lowered by an operator . the elevation mechanism preferably includes a power mechanism to operate a screw jack and the power mechanism may be battery powered , hydraulically powered , or operated by other power - assist means . the screw jack enables the seat to be raised to approximately twice its retracted height .