referring primarily to fig1 two spaced apart vertical supports 11 and 13 are connected at the top thereof by a horizontal shaft 15 . the vertical structural members 11 and 13 are rigidly attached at their bottoms to the ground or other fixed structure and are not movable . a large area between the support members 11 and 13 , and under the horizontal shaft 15 , is maintained free of any obstructions so that a passenger carrying cage 17 and its associated supporting structure may be rotated in a full circle about the horizontal shaft 15 . the movable structure supporting the passenger carrying cage 17 includes two elongated support members 19 and 21 . one end of each of the members 19 and 21 is supported by the shaft 15 at spaced apart positions by suitable journal connection therewith so that the members 19 and 21 are freely rotatable about the shaft 15 but still are capable of supporting a large amount of weight . the member 19 is similarly journaled onto a rod 23 at its opposite end . thus , the member 19 is freely rotatable about the rod 23 while supporting a portion of the load of the passengers and passenger cage that is held in part by the rod 23 . similarly , the member 21 is journaled onto another rod 25 . the rod 23 is held fixed against rotation with respect to the passenger cage 17 by attachment to support members 27 and 29 that are rigidly attached to the top of the passenger cage 17 . the rod 25 is held by projections 31 and 33 of the passenger cage 17 but in a manner to be freely rotatable with respect thereto . the rods 23 and 25 are mounted so that their center axes line up along a common axis indicated at 35 . the length of the support members 19 and 21 and their respective mountings at their opposite ends are designed so that this axis 35 remains substantially parallel with the support shaft 15 at all rotatable positions of the members 19 and 21 about the shaft 15 . a circle traced out by the axis 35 as the members 19 and 21 are rotated around the shaft 15 has the shaft 15 as the circle &# 39 ; s center . because of the free rotation between the support element 19 and the rod 23 , and between the support element 21 and the rod 25 , the passenger carrying cage 17 may rotate with respect to the members 19 and 21 as they themselves are rotated . this is illustrated in dashed outline in fig2 . an additional mechanism is provided in connection with the passenger carrying cage 17 and the shaft 15 in order to maintain the passenger cage 17 horizontal , as illustrated in fig2 no matter what the rotatable position of the supporting members 19 and 21 . this additional mechanism includes an endless stabilization chain 37 which engages the teeth of circular sprockets 39 and 41 . the sprocket 39 is fixed to the support shaft 15 so that it does not rotate with respect to the shaft 15 . the shaft 15 in turn is fixed to the support members 11 and 13 . that is , the shaft 15 is held by the support members 11 and 13 in a manner to prevent rotation of the shaft 15 . the circular sprocket 41 is also fixed to the rod 23 and since the rod 23 is fixed against movement with respect to the passenger cage 17 , the sprocket 41 is so held against rotation with respect thereto . the center of the sprocket 39 is the axis of the support shaft 15 and the center of the sprocket 41 is the axis 35 . the sprockets 39 and 41 are identical in diameter , number of teeth , etc . the result is that the elements 37 , 39 and 41 positively maintain the passenger cage horizontal as the axis 35 is rotated in a circle about the support shaft 15 . rocking , swaying and oscillation of the passenger cage 17 that would result without the stabilization mechanisms 37 , 39 and 41 is thus eliminated by it . in order to modify the natural frequency of oscillation of the passenger carrying cage and its supporting structure while rotating about the horizontal support shaft 15 , counter - balancing weights 43 and 45 are provided , respectively , on rigid extensions 20 and 22 of the support members 19 and 21 , respectively . the weights 43 and 45 are thus on the opposite side of the rotation center at the shaft 15 from the passenger cage 17 , and also act to reduce the effort required of the passengers to rotate themselves about the shaft 15 . in order that the passengers themselves within the cage 17 can propel the mechanism to swing about the support shaft 15 , yet another connection between the passenger cage 17 and the horizontal support shaft 15 is provided . a second endless chain 47 extends between circular sprockets 49 and 51 . the sprocket 49 is fixed on the rod 25 and thus is permitted to rotate with that rod with respect to the passenger cage 17 . the sprocket 51 is fixed to a rod 53 . the rod 53 is journaled in a supporting block of material 55 . the rod 53 also carries a gear 57 fixed thereto on the opposite side of the block 55 . the gear 57 engages another gear 59 , the latter gear being fixed to the shaft 15 . the supporting block 55 is held by the shaft 15 in a manner to be rotatable thereabout . an opposite end of the block 55 is securely fastened to a horizontal spacer 61 . the spacer 61 is rigidly connected between the support members 19 and 21 . it can thus be seen that this structure transfers rotation of the rod 25 to a rotation of the gear 57 . a rotation of the gear 57 in turn causes the support structural elements identified by the reference numbers 19 , 21 , 55 and 61 to rotate about the horizontal support shaft 15 . this results from the gear 57 moving around the outside surface of the gear 59 . during such rotation , the support shaft 53 of the gear 57 and the sprocket 51 remains horizontal to and an equal distance from the support shaft 15 . this mechanism is caused to operate by passengers themselves that are sitting or standing within the passenger cage 17 . referring initially to fig2 a passenger sitting within the cage 17 , as shown in dashed outline , grips a handle 63 which is attached to a lever 65 . back - and - forth motion by the passenger through the handle 63 causes the lever 65 to rock back - and - forth about a pivot rod 67 , as is best illustrated in fig4 . the pivot rod 67 is fixed to the passenger cage 17 and the lever 65 is permitted to rotate with respect thereto . the upper end of the lever 65 carries a slot 69 elongated in the direction of the length of the lever 65 . captured within the slot 69 is a pin 71 , this pin being eccentrically mounted on a small circular wheel 73 . the wheel 73 is fixed to the rod 25 . therefore , back - and - forth motion of the lever 65 by a passenger within the cage 17 is translated into rotary motion of the wheel 73 . this rotary motion is thus used to give the entire mechanism motion , as described hereinabove . the amount of effort required to operate the ride will depend upon the amount of weight carried by the passenger cage 17 . this weight will depend upon the number of passengers therein and their individual weights . in order to maintain this required effort relatively uniform from ride to ride , a variable effective counter - weight may be provided to be under control of the operator . such a variable counter - weight mechanism is shown , in one embodiment , in fig5 . the embodiment of fig5 shows a modification of the top structure of the swinging ride of fig1 . referring to fig5 modified extensions 20 &# 39 ; and 22 &# 39 ; of the support members 19 and 21 , respectively , carry a counter - weight 81 slidable therealong in a direction toward or away from the shaft 15 . a rigid support shaft 83 connected between the elements 20 &# 39 ; and 22 &# 39 ; carries a housing 85 having an electric motor therein . the housing 85 is constructed with the rod 15 extending therethrough . the housing 85 is rotatable around the rod 15 when the swinging ride is operated . in order to energize the motor within the housing 85 , an electrical circuit 87 extends within the rod 15 along the axis of rotation of the ride to an appropriate electrical commutator within the housing 85 which supplies energy to the motor therein at least when the passenger cage is in its lower most passenger loading and unloading position . the motor within the housing 85 drives shafts 89 and 91 on opposite sides thereof which are operably connected to ball screw devices 93 and 95 , respectively . the ball screw devices 93 and 95 cooperate , respectively , with threaded rods 97 and 99 which are fixedly attached to one side of the counter - weight 81 . when the motor within the housing 85 is energized , its shafts 89 and 91 rotate in a selected direction . this rotation causes captive nuts within the elements 93 and 95 to rotate in the selected direction . these captive nuts are in threaded engagement with the shafts 97 and 99 , thus causing the counter - weight 81 to move back - and - forth along the support elements 20 &# 39 ; and 22 &# 39 ;. in operation , an amusement ride operator would energize the motor within the housing 85 through an appropriate electrical control 101 connected between a power source and the line 87 . after the passengers have entered the passenger cage , the operator adjusts the position of the counter - weight 81 to an appropriate position . although specific examples of the present invention have been described , it will be understood that the various aspects of the present invention are entitled to protection within the full scope of the appended claims .
a passenger carrying cage pivotally mounted at one end of a movable support structure is rotatable completely about an elevated horizontal shaft . the passenger cage is stabilized by a positive mechanical connection between the cage and the shaft so as to maintain the same cage attitude relative to the ground in any of its rotatable positions about the shaft . the rotation is made possible by power supplied from within the passenger carrying cage by the passengers themselves reciprocating a lever whose reciprocation is transmitted by another positive mechanical connection between the cage and the horizontal shaft .