the above described drawing figures illustrate the invention , a suction device for use in forming an attachment to a human penis 5 . the device , as shown in fig1 includes a wall means 10 , preferably a cylinder as shown in the figures , having a smooth inside wall surface 20 . the wall means 10 provides an aperture 30 at one end , as shown in fig3 the aperture 30 being of a size and shape as to be capable of accepting the penis 5 . preferably , the aperture 30 is round and only slightly larger than the girth of the penis 5 . a piston 40 is movable within the wall means 10 and fitted therein so as to form a relatively tight sliding fit . preferably , one or more o - rings 50 , as best shown in fig2 & amp ; 3 , are used to seal the piston 40 against the inside wall surface 20 . a sealing means 60 is used to seal the penis within the annular wall means 10 . such a sealing means 60 is preferably a sheath which provides a proximal end 65 which when stretched around the wall means 10 adjacent to the aperture 30 forms a tight seal . this sheath ( sealing means ) 60 is preferably made of an elastic material such as rubber so that it is easily removed from the wall means 10 . it extends distally outwardly from the wall means 10 and , in one embodiment , as shown in fig1 has a distal open end 70 sized for sealing around the shaft of penis 5 when the penis 5 is inserted into the sheath 60 through open end 70 . in an alternate embodiment , as shown in fig2 and 3 , the open end 70 is formed as the terminus of a cone frustum 64 . the sheath 60 preferably provides at least one annular bead 68 positioned for contact with the penis . the annular beads 68 help to seal the penis within the sheath 60 . alternately , the sealing means 60 may be an annular rubber boot , tape , or other means for sealing ( not shown ). as best seen in fig2 and 3 , the aperture 30 of the wall means 10 preferably provides an annular , outwardly directed flange 80 for improving the engagement and holding strength between the sheath 60 and the wall means 10 . the piston 40 provides such mass as to enable stretch training of the penis 5 . in this regard , the weight of the piston 40 and wall means 10 is preferably in the range of 1 to 40 pounds . this range of weight has been found to work advantageously in weight and condition training of the penis 5 . the piston 40 further provides a means for attachment 90 of an additional weight ( not shown ) to it . this weight attachment means 90 may typically be a hook , an eye , or any other mechanical fastening means including magnetic attachment . in the figures the attachment means 90 is a rod threaded into the piston and providing an eye at its distal end . as best seen in fig1 a the device preferably also includes a means for locking 95 of the piston 40 at a selected longitudinal position within the wall means 10 . preferably it consists of an elongated , longitudinally oriented slot 100 impressed into the surface 42 of the piston 40 , with spaced apart smaller lateral slots 110 . corresponding to this slot structure 100 , 110 in the piston 40 , is a boss 120 extending inwardly from the inside wall surface 20 of the wall means 10 . the boss 120 engages the longitudinal slot 100 so that the piston 40 may move longitudinally within the wall means 10 . when the piston 40 is moved to a selected position longitudinally within the wall means 10 , the piston 40 may be rotated to engage the boss 120 with one of the smaller lateral slots 110 in order to lock the piston 40 at the selected longitudinal position . alternatively , the elongated , longitudinally oriented slot 100 , with spaced apart smaller lateral slots 110 , may be impressed into the inside wall surface 20 , and the corresponding boss 120 may then be extending outwardly from the piston 40 . in practice , with the piston 40 positioned as in fig2 the penis 5 may be inserted into the distal open end 70 of the sheath 60 as shown in fig3 . preferably the distal open end 70 must be stretched over the penis 5 so as to form a tight seal around the penis shaft . the piston 40 is then drawn away from the penis as shown in fig3 . this action of the piston 40 pulls a vacuum in the upper end 12 of the side wall means 10 , while the sheath 60 maintains a seal . under the forces of this vacuum , the penis 5 tends to swell into contact with the inside wall surface 20 of the wall means 10 and the attachment is complete . preferably the wall means 10 is selected to be of a size to limit the amount of lateral swelling of the penis 5 . vacuum forces hold the device to the penis 5 while the weight of the device provides a stretching force on the penis 5 generally , and may be specifically applied to a circumcised penis shaft skin for the extension thereof in extending such skin to function as foreskin . an important aspect of the present invention is the automatic adjustment of the device when added weight is applied . to understand this , consider the device as applied to a penis 5 as described above . assume that the piston 40 has been drawn downwardly within the cylinder 10 until just enough suction force has been applied to the penis 5 to hold the device in place on the penis 5 . the piston 40 is not locked in place within the cylinder 10 . now , a further weight ( not shown ) is added to the piston 40 , as for instance by attaching it to the attachment means 90 . this new weight overcomes the existing suction force and therefore causes the piston 40 to move downwardly within the cylinder 10 until the suction force increases enough to equal the incremental force of the new weight . the piston 40 is now held in equilibrium at a new location within the cylinder 10 . notice that this establishment of a new position of the piston 40 is fully automatic . in an alternate embodiment of the invention depicted in fig4 the penis sealing means 60a provides an annular lip 130 of a resilient material positioned around the aperture 30 , with the annular lip 130 extending radially toward the penis 5 and is obliquely angled in the direction of penis insertion , see arrow &# 34 ; a &# 34 ; in fig4 so as to form a seal around a shaft of the penis , the annular lip 130 being of such flexibility and angle as to radially deflect as the penis shaft enlarges when a vacuum is drawn in the device , the radial deflection operably improving a seal between the annular lip 130 and the shaft of the penis 5 . further , withdrawal of the penis in a direction opposite to that shown by arrow &# 34 ; a &# 34 ; causes the annular lip 130 to constrict or tighten on the shaft of the penis 5 , thus resulting in a tighter seal . it should be noted that in fig4 the shaft of the penis 5 is shown as having a smaller and a larger conformation with phantom lines &# 34 ; b &# 34 ; and &# 34 ; c &# 34 ; respectively . under vacuum conditions the shaft of penis 5 expands as shown from an initial size defined by line &# 34 ; b &# 34 ; to a larger size as defined by line &# 34 ; c &# 34 ;. note that lip 130 is caused to deflect downwardly and radially outwardly in fig4 in order to allow for the expansion of penis 5 . it is the angle , size , position and flexible nature of the lip 130 that is the basis for successful operation of this embodiment and such is claimed . note also the manner in which the sealing means 60a is formed so as to engage the open end of the wall means , i . e ., by a double wall 132 . in a still further embodiment of the invention as shown in fig5 the penis sealing means 60b provides an annular sleeve 140 made of a resilient material and positioned around the aperture 30 , the annular sleeve 140 extending radially inwardly toward the penis 5 so as to form a seal around a shaft of the penis 5 ; the penis sealing means 60b further providing a means for inflating the annular sleeve 140 so as to radially direct the annular sleeve 140 toward the penis shaft thereby improving a seal between the annular sleeve 140 and the shaft of the penis 5 . the inflating means , in a first embodiment shown in fig5 is a manual pump means 150 having an inlet valve 152 and an outlet valve 154 , the pump means 150 being in air flow communication with the annular sleeve 140 so as to force air into the sleeve for inflation it . fig6 shows the pump means 150 in the process of being manually squeezed whereby forced air to move in the direction shown by arrow &# 34 ; d &# 34 ;, and fig7 shows the pump means 150 in the act of recovering whereby air is drawn into the pump means as shown by arrows &# 34 ; e &# 34 ;. please note the state of valves 152 and 154 in fig6 and 7 . such valves 152 and 154 may be simply annular lips that are molded integrally with the pump means 150 , a bladder type air bulb . alternately , the inflating means comprises the wall means 10 being in air flow communication with the annular sleeve 140 such that as the piston 40 moves away from the penis 5 , that is , in the direction shown by arrow &# 34 ; f &# 34 ; in fig5 air is forced from the wall means into the annular sleeve 140 , through tube means 160 for inflation thereof . with an enclosed chamber formed within wall means 10 , the movement of piston 40 causes air entry into tube means 160 . the weight exerted by piston 40 in this case pressurizes sleeve 140 causing it to expand as shown by line &# 34 ; g &# 34 ; against penis 5 for an improved seal . an auxiliary valve 170 is shown in fig5 . this valve is preferably a compound valve providing three functions ; first , it may be set to allow air to move from the tube means 160 into the sleeve 140 for inflation thereof , second , it may be set to seal air flow into or out of the sleeve , once the sleeve is fully inflated , while allowing air to exhaust from the tube means 160 so that the piston 40 may continue to move downwardly to improve the vacuum behind it , and third , it may be set to exhaust both the sleeve and the tube means 160 when the device is to be removed from use . such three - way valves are common in the art so that no further detailed description is provided here . an alternative to the three - way valve is to use three separate valves , whos interconnection and use for accomplishing the functions described above is well known to those of skill in the art . fig5 also shows a second sliding seal 50a for sealing the shaft 90 while allowing its linear motion in either direction . each of the above described embodiments is able to perform the same function for fulfilling the objectives of the invention , i . e ., to seal the penis securely within the device and hold the device to the penis without causing pain or blood vessel breakage in the penis structure while placing the penis in traction . while the invention has been described with reference to at least one preferred embodiment , it is to be clearly understood by those skilled in the art that the invention is not limited thereto . rather , the scope of the invention is to be interpreted only in conjunction with the appended claims .
a cylinder and piston device provides a sheath for securing a penis into one end of the cylinder . the piston then acts to draw a vacuum for holding the cylinder and the penis together as a unit . once a vacuum is drawn , a means for holding the piston at a preferred position is engaged . significant weight may be applied to the device , or the device itself may contain significant mass so as to apply a stretching force onto the penis . the device provides a means for stretching a human penis and is quickly and easily applied to the penis and removed therefrom . the device enables further weight mass to be applied to enabling a program for stretch training of the penis through the application of incremental weight additions . the device prevents lateral swelling of the penis and provides a means for locking a level of vacuum that is appropriate for holding the weight involved in the procedure and that is also comfortable to the person undergoing the weight training .