a comparison of the views of the invention illustrated in fig1 , 3 shows the benefits obtained by practice of the invention . these three drawings depict the mattress in its high , medium and low positions , respectively , with commensurate positions of the gate shown in its up and down positions . all arrangements result in mattress platform to gate dimensions which comply with the requirements of 16 cfr 1508 . 3 ( b ) as mentioned above . the particular advantage achieved by the addition of an added stopping position for gate 53 is that of permitting the height of the mattress 54 to be at a height above the floor of approximately 36 inches ( shown in fig1 as &# 34 ; hf &# 34 ;) so that the mother of a newborn infant does not have to stoop when attending to the infant in the crib , while still keeping the lowered gate 53a above the height of the mattress 54 ( fig1 ). in addition , when the infant has grown such that the mattress 54 may be lowered , as shown in fig2 and 3 , the gate 53 will be maintained at a height , in both the up and down positions , relative to the mattress 54 so as to better protect the infant from an accidental fall . further to the detail of fig1 post 50 is typical of the posts of the crib which support the gate 53 and mattress 54 apparatus . as is known , gate 53 is held in a vertical plane by rods 52 in moving from its top to its bottom position . some cribs are built with two operating gates , and so have four posts with gate stop apparatus ; some cribs have only one operating gate and two posts with gate stop apparatus . in either design , the invention relates to the posts supporting an operating gate and contemplates a pair of cooperating intermediate stops 51 for selectively engaging opposite ends of each gate . a stop 51 is attached to each post 5c and partially nests into a cavity 60 ( see fig9 ) by means of a screw 63 threaded into post hole 61 . as will be seen in fig1 , and 9 , cavity 60 is configured to hold stop 51 in the operative orientation ( as in fig1 and 4 ) or , when rotated , in the inoperative orientation ( as in fig2 and 6 ). when stop 51 is mounted in the operative orientation , sleeve 58 is horizontal and accessible for insertion of a screw to suspend mattress platform 55 . stop 51 is seen in detailed perspective in fig7 as being substantially an &# 34 ; l &# 34 ; shaped block . the internally threaded sleeve 58 is pressed with a snug fit into a hole formed through surface a of stop 51 and located beneath protrusion d . the internally threaded sleeve 58 may be formed of metal and utilized with stop 51 formed of wood or other firm material . alternatively , stop 51 may be formed of a machinable plastic , such as polypropylene , in which case an internally threaded bore may be formed directly in stop 51 . the axis of hole 57 is perpendicular to the axis of sleeve 58 and passes through stop 51 from surface b to surface c . on assembly , a screw is passed through hole 57 to anchor in hole 61 in post 50 . referring now to partial assembly drawing fig6 stop 51 is shown in its inoperative position attached to post 50 and nested in cavity 60 . in this position , sleeve 58 is inaccessible and protrusion d is confined within the boundaries of post 50 . thus positioned , stop 51 is inoperative and will not prevent a gate 53 from dropping to a lower level when released . returning to fig1 and 4 , it is seen that stop 51 is mounted in cavity 60 in the operative position with its protrusion d extending outwardly from post 51 in a position to intercept the downward travel of gate 53 at a height above that of the top of mattress 54 . this is indicated by the dashed line gate position 53a . strap 56 , a lower end of which is adapted to suspend mattress platform 55 , is mounted at an upper end by a screw threaded into sleeve 58 of stop 51 . the invention recognizes that sleeve 58 of stop 51 provides the sole hanging means for hanging mattress platform 55 at its highest level . accordingly , stop 51 in the fig1 configuration is mounted in its operative orientation which allows mattress platform 55 to be hung at a height of 31 inches above the floor , according to the preferred embodiment . the invention also recognizes that in order to suspend mattress platform 55 at its highest position , stop 51 must be operative and the downward travel of gate 53 must terminate above the height of mattress 54 . gate 53 is movable from a top position ( solid lines ) to an intermediate position 53a ( dashed lines ) in which its top rail is at least 9 inches higher than the mattress platform 55 . this conforms to the requirement of 16 cfr 1508 . 3 ( b ) but is low enough to allow the mother to easily handle the infant . this dimension is shown as &# 34 ; hd &# 34 ; in fig1 and 4 . fig5 illustrates a top view of a portion of the baby crib of the invention with mattress platform 55 in its highest position and strap 56 ( fig8 ) suspending the mattress platform 55 from stop 51 . stop 51 is partially nested in cavity 60 with protrusion d intercepting the downward travel of gate 53 . an upper end of strap 56 is held by a screw threaded into sleeve 58 and a lower end of strap 56 is held by a screw threaded into the mattress platform 55 . as the infant grows , the mattress 54 is repositioned to a lower level , as shown in fig2 . at the intermediate level shown for the mattress platform 55 , strap 56 is attached by means of a screw screwed into internally threaded sleeve 65 which is pressed into a hole in post 50 with a snug fit . at this mattress level as shown in fig2 the invention recognizes that there is sufficient height differential to the position of lowered gate 53a stopped by the conventional gate stop such that there is no need for stop 51 of the invention . for this reason , and so that gate 53 can be lowered past stop 51 , the invention construction permits stop 51 to be remounted on post 50 in its inoperative orientation as in fig2 . stop 51 nests completely into cavity 60 ( see fig9 ) when in the inoperative orientation and is held by the same screw and hole as used in fig1 . in this inoperative orientation , sleeve 58 is nested within cavity 60 and inaccessible to a strap suspending screw . therefore , the invention construction , for the infant &# 39 ; s protection , prevents and makes impossible the mattress platform 55 being mounted in its highest position while allowing gate 53 to move lower and leave a &# 34 ; flush &# 34 ; mattress . a similar condition exists in the situation of fig3 in which the infant has grown more and is capable of standing in the crib . mattress platform 55 is held by strap 56 , the top end of which is mounted to post 50 by lowest threaded sleeve 65 . gate 53 is shown in its top position in solid lines and in its bottom position 53a in dashed lines . in fig3 as in fig2 stop 51 is nested in cavity 60 , smoothly blending into the contour of post 50 . at this relative position , the height from the top of mattress 54 to the top of raised gate 53 is approximately 261 / 2 inches , and in its lowered position is approximately 161 / 2 inches . as described above , the invention fulfills its objections , conforms to applicable regulations and provide a useful improvement over pre - existing crib constructions . it is to be understood that variations on the basic concepts disclosed will be apparent to those skilled in the art and , as such , are considered within the scope and spirit of the invention .
the present invention provides a novel baby crib having means to mount a mattress platform at a variety of selected heights above the floor and a gate stop adjustable between an operative and an inoperative orientation . in the operative orientation , the gate stop prevents the gate from being lowered to its normally lowest position . in the inoperative orientation , the gate stop does not interfere with gate travel . the invention in a first embodiment provides means so that when the mattress is in the maximum height position , the gate stop must be in the operative orientation , thus preventing the gate from being lowered beyond the mattress height position .