illustrated in fig1 , by way of example only , in fig1 , is a stand - alone - swing system 10 comprising a stationary supporting frame 20 from which is suspended swing seat unit 30 including seat 32 ( occupant not shown ). swing seat unit 30 is suspended from above by ropes 34 a , 34 b , 34 c and 34 d which are secured to brackets to be described . of course , seat suspension media may be selected from the group consisting of ropes , chains , wires , cords , and lines , without departing from the spirit and scope of the invention claimed . further , as discussed herein in more detail , the swing seat 32 can have overhead support structures other than a free - standing frame 20 . seat 32 could also be in the form of a chair ( e . g ., wheelchair ) supported by a platform , which in turn would be suspended by media from above as noted above . for brevity , but in no way intended as limiting the scope of claims appended hereto , the suspension media are hereafter referred to as “ ropes .” said ropes 34 a - d are secured in a conventional manner ( e . g ., by conventional connector links 48 a , 48 b , respectively ) to swing arm brackets 46 a and 46 b located within or adjacent stationary , relatively fixed top support unit 40 . a pneumatic power drive apparatus 50 ( not visible in fig1 , but clearly depicted in fig2 ) is housed or enclosed within relatively stationary support unit 40 where it is fixedly attached . as will be explained , suspended swing seat 32 oscillates repetitively along an arc as power unit 50 propels swing arm brackets 46 a , 46 b . these brackets 46 a , 46 b or their equivalents represent the interface of the swinging and power operations now to be described in detail . swinging action of swing seat 32 and its seated occupant is powered by a pneumatic power drive apparatus 50 . this pneumatic power drive apparatus is operatively interconnected generally between said swing arm brackets 46 a , 46 b and stationary or fixed support 40 . the power drive apparatus can include a pneumatic cylinder 56 connected at its first end to said stationary support 40 and receiving at a second end thereof a piston rod 62 for extending and retracting motion therein . note that since cylinder 56 must have freedom of movement to an extent affording pivoting during its swing oscillation operation . to this end , cylinder 56 may be affixed at its first end via pivot pin connection 54 and pivot bracket 52 relative to stationary top support unit 40 ( or connected to other conveniently adjacent stationary structure ). piston rod 62 includes an outer working end viewed in fig2 and 3 indirectly connected via bolt 70 and nut 71 to swing arm bracket 46 a . swing support brackets 46 a and 46 b are depicted as drivingly interconnected by substantially horizontal oscillator shaft 44 to be further discussed herebelow . power drive apparatus 50 is regulated and controlled by pneumatic system 200 schematically depicted in fig4 . the term pneumatic , in its present sense , is intended to include air and other gaseous fluid which may adequately serve in a manner equivalent to air . the terms air and pneumatic are used interchangeably herein . while the swing unit per se may take a variety of forms , it is believed useful to establish a swing environment relative to the present disclosure by generally describing the swing and suspension configuration depicted in fig1 and 2 . self - powered swing 10 is seen to include frame 20 with four depending legs 22 a , 22 b , 22 c , 22 d sufficiently spaced to maintain the suspended chair or seat unit 30 in a secure disposition on the ground or floor as it rests atop non - slip feet 24 a , 24 b , 24 c and 24 d . this secure disposition may vary depending on the nature of the swing and whether the swing will be utilized to support larger individuals ( e . g ., adults ) or smaller individuals . in any case , the frame unit 20 presents a stable and reliable “ footprint ” such that a seat 32 occupant will not fall or tip while swinging takes place . selection of tubing ( or alternative profile structure ) for frame legs 22 a , 22 b , 22 c , and 22 d can be made from any number of selected commercial grade tubing or other type of suitable rod element , material . swing seat 32 may be chosen from any number of seating units commonly available in the marketplace . in fact , multiple seat sizes and configurations can be kept in reserve to accommodate varied seat occupant mass and sizes . likewise , top support unit 40 may be made of steel , aluminum or other suitably fabricated material as long as the resulting structure is of sufficient weight , strength and stability to withstand a vast multitude of swinging repetitions desired by the manufacture and / or expected by the swing seat occupant . returning now to swing suspension 41 , fig2 shows swing suspension journal bearings 42 a , 42 b securely anchored to support 40 . these bearings 42 a , 42 b may be bolted in place or otherwise reliably affixed to support 40 ( via welding , riveting or the like ), and are transversally interconnected by substantially horizontal oscillator shaft 44 therebetween . this oscillator shaft 44 supports the swing seat or unit 30 via brackets or swing arms 46 a , 46 b therebelow to be driven by pneumatic power drive apparatus 50 in the following manner . as briefly referenced above , spaced - apart swing arms or brackets 46 a and 46 b are rigidly interconnected substantially at their upper ends to oscillator shaft 44 so as to depend therefrom . said brackets or arms 46 a , 46 b removably support swing suspension hooks 48 a and 48 b , respectively , located substantially at lower ends thereof . arm 46 a may be directly driven by the pneumatic power system as described . inasmuch as hooks 48 a , 48 b may have alternative equivalent connectors substituted therefor , said hooks 48 a , 48 b should be considered mere examples of possible configurations and in no way limiting any claims to such assembly . of course , piston rod 62 reciprocates in its normal working strokes within cylinder 56 , and directly drives swing arm bracket 46 a . thus , swing arm bracket 46 b is indirectly driven through a rigid interconnection to oscillator shaft 44 . this driving action sets into action swing unit 30 in an oscillating motion . oscillation is maintained by pneumatic power system 50 fixedly located within top support unit 40 . a first ( forward ) movement of brackets 46 a , 46 b serves to push seat 32 outward in one direction and then , with second ( rearward ) movement , retracts swing seat 32 in an opposite direction . the repetitively reversing action is registered ( self - indexed ), by reason of reaching the end of a propelling stroke in either direction . mounting nut 60 b ( fig2 ) holds control valve unit 82 to mounting bracket 58 , in turn held to cylinder 56 by nut 60 a . control valve unit 82 is actuated by outward extending contact points in the form of first and second valve reversing elements 80 a , 80 b ( fig2 , 3 ). in the interest of illustration simplicity , external control valve unit 82 is presented herein without its well known pneumatic feed / return lines and requisite port details ( e . g ., pressure port , work port , exhaust port and so forth ), so as not to obstruct the view of valve - controlling trigger arm 72 and its associated parts with respect to these valve reversing elements 80 a , 80 b . pneumatic lines or tubing placement ( not shown ) is notoriously known by the skilled artisan within in the industry and such lines may be positioned according to functional performance requirements and / or environmental conditions such as space availability . for instance , control valve unit 82 as viewed in fig2 , 3 could include three lateral ports along its exposed side . typically , these ports would comprise two outlets separated by an inlet , all communicating via an internal spool valve mechanism ( also not shown ) and would further include a pair of ports on an opposite side of valve unit 82 . the latter ports ( not shown ), of course , will communicate respectively with opposite ends of cylinder 56 to drive piston rod 62 in its opposite strokes . the internal workings of reversible valve units are notoriously well known to the skilled artisan . trigger arm 72 is mounted adjacent to the rod end 68 by mounting nuts 66 a , 66 b . trigger arm 72 , of course , moves forward ( i . e ., away from its connection to top support unit 40 ) as cylinder rod 62 extends in direction e , subsequently retracting backward in direction r as cylinder rod 62 retracts . trigger arm 72 is directionally restrained or guided throughout repeated extension / retraction motion by trigger arm guide 84 affixed to control valve unit 82 by bolts 86 a , 86 b . trigger arm 72 includes a pair of contact points ( or stops ) 78 and 88 respectively configured for contact with the aforementioned valve reversing elements 80 a , 80 b . trigger arm 72 carries push bolt 74 ( held by associated lock nuts 76 a , 76 b ) with contact point 78 in general alignment with valve reversing element 80 a . similarly , trigger arm 72 contact point 88 is in general alignment with valve reversing element 80 b . valve reversing is actuated with the sequential contact by contact points 78 / 80 a and 88 / 80 b . other equivalent arrangements of course could be arranged for this sequential valve activation within the scope of the present invention defined in the claims . note that cylinder 56 conceivably could include an internal control valve ( operating generally the same as the described external control valve unit 82 ) depending on pressure level requirements and system design capacity . if this were the case , the valve control trigger elements or their functional equivalents would be suitably arranged within the cylinder 56 housing , or included within structure suitably associated therewith . optional selection of internal and external pneumatic controls is well known in the mechanical power system field . as explained , power unit 50 is affixed or grounded for leverage to top support unit 40 . swing unit 30 is drivingly connected to power unit 50 by attaching drive bolt 70 through hole 49 on bracket 46 a ( see fig2 ) where drive bolt fastener 71 interlocks the drive bolt 70 and bracket 46 a . as the cylinder rod 62 fully extends ( in direction e indicated in fig3 ), trigger arm contact point 88 is engaged by valve reversing element 80 b which shifts an inner sliding spool system of . pneumatic pressure is automatically and substantially instantly reversed in cylinder 56 causing rod 62 to immediately retract ( in direction indicted as r , fig2 ). when rod 62 is fully retracted , contact point 78 shifts control valve unit 82 by pushing valve reversing element 80 a . rod 62 again changes its direction with another power stroke . swing movement may be initiated by a manual push by an attendant . once the power unit 50 is activated , and swing seat 30 oscillating movement is underway , it will continue swinging for an extended period of time . swing 10 and its passenger remain self - propelled in forward ( piston extended ) and reverse ( piston retracted ) motion until the system is shut down . a timer unit can be employed to control a swinging cycle . to facilitate understanding of the overall pneumatic system 200 for operation of power unit 50 , attention is directed to schematic fig4 presented in the form of a block diagram . the pneumatic operational system 200 components include operational pressure source 210 which could be an air compressor unit , pressurized co2 tank ( not shown ) located reasonably near swing set unit 10 or perhaps at a remote location such as a garage or other nearby out - building . other important components operationally linked within the pneumatic system 200 are : filter 220 ; primary pressure regulator 230 ; shut - off valve 240 ; power control 245 ; control valve 250 ; cylinder 260 ; muffler 270 ; reset button 280 ; timer reservoir 290 ; and screened orifice 300 . more specifically , block / flow diagram schematic fig4 relates to pneumatic system 200 and how it serves to propel swing seat unit 30 in a predictably controlled manner . air fed from pressure source 210 passes through filter 220 and system pressure is set by the air pressure regulator 230 . the regulator 230 predetermines the maximum force applied to the air cylinder 56 . a secondary function of pressure regulator 230 is to provide a constant pressure level so that , when reset button 280 is activated , the timing function is replicated . air flow pressure communicates through shut - off valve 240 . shut - off valve 240 serves to shut down swinging operation at the end of a pre - set time period to prevent motion sickness from surplus swing activity . pressurized air proceeds to ( schematically designated ) control valve 250 ( corresponding to unit 82 in representational schematic fig2 and fig3 ) where it is directed to the appropriate end of cylinder 260 ( or 56 , see fig2 and fig3 ) indexed by trigger arm 72 ( see fig2 and fig3 ) in relation to the position of swing seat unit 30 in its typical swinging arc . control valve 250 directs exhausted air from cylinder 260 to muffler 270 . this muffler 270 may take a variety of forms , and is purposed to reduce the typically sharp exhaust sound to a relatively soft pulse of air when released to atmosphere . screened orifice 300 provides a controlled leak for timing management . power control 245 , if needed , provides a means of matching cylinder 260 pressure to the weight of an individual carried in the swing 30 . this can prevent or control aggressive over - swing . the power control 245 can be infinitely adjustable up to the pressure level of the air regulator 230 . further included is a timing device also explained with reference to block diagram fig4 . reset button 280 , when pushed , charges the timing reservoir 290 to the level preset by pressure regulator 230 . when the timing reservoir pressure drops to a predetermined level , it automatically causes a shift in the position of the shut - off valve 240 to close off pneumatic pressure from control valve 250 . this , in turn , ceases the swing seat 30 propelling work performed by the cylinder 260 , thus stopping swinging operation when a pre - selected time period expires . reset button 280 can be pushed before the power unit 50 stops , allowing it to repeat running through the pre - set time period . if the reset button is not activated , the swinging operation diminishes slowly , as gravity eventually brings swing 30 to a complete stop in an “ at rest ” position at the lowest point of swing 30 arc during its oscillation movement . once the system components described hereabove are procured and assembled in operative relationship and power system 50 is interconnected to pneumatic pressure feed from one or more ordinary pneumatic fluid units , operation of swing 10 as suggested in fig1 may commence . with air compressor connection achieved and an occupant seated in swing seat 30 , a monitoring attendant may press ( engage ) reset button 280 and manually initiate the arcing swinging motion by pushing swing seat unit 30 ( as illustrated in fig1 ) sufficiently high to activate pneumatic drive system 50 . optionally as desired , the monitoring attendant may push the swing in a non - powered mode ( without engaging the pneumatic drive system 50 ) simply by not engaging reset button 280 . an occupant seated in the swing seat 30 will experience continuous swinging motion imparted by the drive system 50 until the timer shuts down the pneumatic drive system 50 , or until the monitoring attendant decides to manually stop the swing motion . by way of example only , and according to guidance of physical therapists , a typical timed period between monitoring observations is about fifteen to twenty minutes , but could be somewhat more or less depending on system design . this method of operation is ideal for families with normal or challenged children . it also is ideal for daycare facilities for the disabled or otherwise , including rehabilitation units , institutional care units , or elsewhere to help entertain , provide motion for , and otherwise calm patients who cannot or are unable to propel themselves in the action of swinging and thus enjoy the feeling the air blowing by as they swing . a sense of comfort from a swinging motion is universally known and frequently recommended by therapists and parents worldwide as , to a great extent , essentially replicating an infant &# 39 ; s calming experience . although the foregoing description makes reference to a number of specific features , these should not be construed as limiting the scope of the invention claimed herein . instead , the subject invention described as an apparatus and its method of use should be viewed as susceptible of modification , combinations and alterations . accordingly , claims presented herein are to be considered as covering all such modifications , combinations , alterations , and equivalents thereof within the spirit and scope of the present invention .
apparatus for driving a swing for an occupant of a certain mass and size where the drive mechanism includes a pneumatic power system and linkage for oscillating swing arm brackets . the power system is interconnected between the brackets and a stationary support and is self - compensating for variations in load related to natural frequency of the certain mass and wind resistance relative to occupant size . the power system includes a piston / cylinder arrangement where the piston is drivingly connected to at least one of the swing arm bracket supports and grounded to a stationary support . an automatically self - indexing valve control unit is attached relative to the piston / cylinder arrangement . the valve includes a reversing trigger arm carried by either the piston or cylinder configured to reset pneumatic flow direction with each oscillating piston stroke . the power system timed and is self - compensating for variations in natural frequency due to occupant mass and air resistance .