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Publication numberUS3459423 A
Publication typeGrant
Publication dateAug 5, 1969
Filing dateJun 14, 1963
Priority dateJun 14, 1963
Publication numberUS 3459423 A, US 3459423A, US-A-3459423, US3459423 A, US3459423A
InventorsJames R Meade
Original AssigneeJames R Meade
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Torsion bar swing construction
US 3459423 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

g- 5, 1969 I J. R. MEADE 3,459,423

TORSION BAR SWING CONSTRUCTION Filed June 14, 1963 2 Sheets-Sheet 1 I N V E NTOR. Jam: R. Mann:

ATTOENEY 5,1959 J. R. MEAD 3,459,423

TORSION BAR SWING CONSTRUCTION Filed June 14, 1963 2 Sheets-Sheet z INVENTOR. Lam's R M5405 ATTORNEY United States Patent Oice 3,459,423 TORSION BAR SWING CONSTRUCTION James R. Meade, 2477 New York Ave., Huntington Station, N.Y. 11746 Filed June 14, 1963, Ser. No. 287,998 Int. Cl. A63g 9/16; A47d 13/10 US. Cl. 272-86 10 Claims This invention relates to improvements in a swing construction and, more particularly, to a juvenile swing construction embodying improvements described hereinafter. Without restriction thereto, the swing particularly is adapted to be power operated and, while especially suitable for the amusement of small children, the same principles may be applied to swings for dolls, as well as for human infants and young children.

Various kinds of swings have been devised heretofore which are capable of being set up and supported on horizontal surfaces, such as floors in a home or recreation room. Some of these previously developed swing constructions also have employed power means for operating the swing to oscillate the seat thereof. These prior swings, however, have had certain shortcomings, principally in regard to the bracing of the legs relative to the supporting head, as well as involving complex power means for oscillating the depending seat.

It is the principal object of the present invention to provide a juvenile swing embodying legs depending from a head by mechanism which provides maximum rigidity when the swing is set up and operating so as to minimize danger of a child upsetting the swing while accommodated therein.

Another object of the invention is to provide supporting means for a seat within the aforementioned swing construction, which is extremely simple and yet affords means which not only brace the seat-supporting means against appreciable lateral movement, but also afford simple and effective means by which the seat may be oscillated about its pivotal axis manually or by power means disposed within the head of the swing structure, and obtain a longer ride period than otherwise because of such prevention of lateral movement.

A further object of the invention is to provide torsion bar means and seat-supporting means depending therefrom which provide maximum supporting ability coupled with minimum complexity, said mechanism also readily being capable of compact foldability for merchandising and storage.

Details of the foregoing objects and of the invention, as well as other objects thereof, are set forth in the following specification and illustrated in the accompanying drawings comprising a part thereof.

In the drawings:

FIG. 1 is a perspective view of a swing construction embodying the principles of the present invention and illustrated in set-up, operative condition.

FIG. 2 is a side view of the swing shown in FIG. 1 disposed in compacted, folded position for storage.

FIG. 3 is a fragmentary front view of the upper portion of the swing construction shown in FIG. 1, illustrated on a larger scale than employed in FIG. 1, and showing details of the torsion bar suspension mechanism supported by the head of the swing construction.

FIG. 4 is a fragmentary end view of the structure shown in FIG. 3, as seen on the line 44 of said figure.

FIG. 5 is a transverse vertical sectional view through the head construction shown in FIG. 3, as seen on the line 5-5 of said figure.

FIG. 6 is a fragmentary, foreshortened bottom plan view of the head portion of the swing construction shown in the preceding figures and illustrating, in full lines, the

3,459,423 Patented Aug. 5, 1969 position of the legs with respect to the head when in extended, supporting position, and, in broken lines, showing the position of said legs with respect to the head when the swing construction is folded, as illustrated in FIG. 2.

FIGS. 7 and 8 respectively are front and side fragmentary vertical elevations, on a larger scale than in the preceding figures, and illustrating parts of the supporting means for the seat of the swing construction.

FIGS. 9 and 10 respectively are fragmentary end and side elevations of clutch means for the mechanism by which the power means is energized.

FIGS. 11 and 12 respectively are fragmentary side elevations taken at to each other and illustrating connecting means for telescoping sections of the legs of the swing construction.

Referring to FIGS. 1 and 3 particularly, it Will be seen that the swing construction embodying the principles of the present invention comprises a head 10, which may be formed from sheet metal or other suitable material, such as fiber reinforced plastic, or the like, and comprises an inverted trough having opposite ends 12 and 14. In the preferred construction, the ends 12 and 14 extend downward and outward, at a very acute angle with respect to each other, as best seen in FIG. 3, for purposes to be described. The lower portions of said ends are bent inwardly to provide substantially horizontal flanges 16, one of which is shown in bottom plan view in FIG. 6. Said flanges are provided with a pair of longitudinally aligned slots 18 through which legs 20 extend.

In the preferred construction thereof, the legs 20 comprise a plurality of interconnected sections which are provided with interfitting, telescopic portions, details of which are shown in FIGS. 11 and 12 and are described hereinafter. For purposes of attractive finish, ease of manufacture, and maximum strength, the legs 20 preferably are formed from tubular metal. The uppermost section of each leg 20, at its upper end, preferably is flattened to provide an car 22. Each of said ears are pierced to provide a pivot hole receiving a suitable pivot, such as a bolt or rivet 24. The legs may be pivotally moved between the positions shown in FIGS. 1 and 4, which is the extended, supporting position, and the contracted or folding position shown in FIG. 2. Movement of the legs between these respective positions is principally controlled by the ends of the slots 18 in the flanges 16. Additional bracing between the pairs of legs at the opposite ends of the head 10 is afforded by the collapsible transverse brace members 26, which are connected at the ends thereof to said pairs of legs.

As will be seen especially from FIG. 3, the legs 20 preferably are substantially parallel to the diverging ends 12 and 14 of head 10, whereby the head is supported, in effect, by somewhat pyramidal arrangement of four legs in that the legs of each pair, which are connected to the ends 12 and 14 of the head 10, not only extend divergingly apart in a direction transverse to the head 10, but the pairs of legs are arranged in diverging relationship as shown in FIG. 3. Further, the confining of the legs within the slots 18 of flanges 16, which are preferably integral with the ends 12 and 14 of head 10, results in very substantial rigidity between the legs and head 10, not only in a transverse direction, but especially in a longitudinal direction with respect to the axis of the head 10. Accordingly, both pairs of legs are arranged to resist movement applied against the opposite ends of the head 10, due to the slot arrangement in flanges 16, as distinguished from only a single pair of such legs being able to resist such movement as would be the result if the slotted flanges 16 were not provided.

The swing construction also, preferably, is provided with a seat 28, which, both from the standpoint of comfort, as

well as economy in manufacturing, preferably is formedfrom a rigid frame comprising stiff wire of suitable gauge, said frame having an upwardly extending back portion 30, and a forwardly extending front portion 32. The preferably flexible fabric seat is connected to the frame by appropriate hems, in accordance with conventional construction of such type.

The seat 28 is supported by very simple but highly effective means comprising a torsion bar 34, which, in the preferred construction, is U-shaped and has substantially horizontal, opposite pivot ends 36 which are coaxial. Intermediately of said pivot ends 36 is a central, substantially horizontal portion 38, the same being supported by a pair of legs 40, which are integral with the portion 38 and pivot ends 36. The pivot ends 36 extend through appropriate, simple bearings 42, which are formed in the ends 12 and 14 of head 10, said bearings, for example, being made from appropriate molded synthetic resin having self-lubricating properties. To accurately position the torsion bar relative to the head, the terminal ends of the pivot ends 36 are threaded so as to receive cap nuts 44.

The pivot ends 36 also preferably are bent to provide notched portions 46, which receive loops 48 formed in the upper ends of a part of seat-supporting means, said part preferably being rigid and comprising elongated, rigid links 50, the lower ends of which have hooks 52 formed therein, as shown in FIGS. 1 and 2, said hooks conveniently engaging corner portions of the back 30 of the frame of the seat 28, the flexible covering of the seat preferably being cut away adjacent said corner portions to render the corners of the frame accessible, as shown in FIG. 1.

The torsion bar 34 conveniently may be formed from heavy wire stock of suitable gauge to insure against appreciable deflection which is essential to the invention. In view of the fact that the notched portions 46 preferably are formed near the opposite ends of the torsion bar, notwithstanding the fact that the entire weight of the seat and its occupant is sustained by said torsion bar, the gauge of wire from which the torsion bar is formed need not be excessively heavy. Further, if desired, it is conceivable that the torsion bar could be formed from square or rectangular bar stock of suitable gauge and size, or even stamped from sheet metal, if desired, the pivotal end portions of the torsion bar, of course, being appropriately shaped to render the same capable of being disposed in bearings 42.

The upper portion of the rigid links 50 are so shaped in front elevation, as seen in FIG. 3, that an appreciable portion thereof preferably is closely parallel to the depending legs 40 of the U-shaped arrangement of torsion bar 34, as also is clearly shown in FIG. 3. Means to connect the links 50 and torsion bar are provided in the form of simple, pressed metal couplers 54. Such metal is bent so as to be disposed in the corner portions comprising rightangled bends which connect the ends of the central portion 38 with the legs 40. Suitable means, such as a rivet 56, hold the couplers 54 connected to the torsion bar and a pair of spaced ears 58 extend outwardly from the coupler to receive between said ears the links 50. Such disposition of the links 50 between the ears 58 effectively insures that the torsion bar 34 and links 50 will swing in unison with each other.

The supporting means for the seat 28 also includes other parts than the rigid links 50, said other parts, in the preferred embodiment thereof, comprising simple, flexible chains 60. At the upper end of each chain is a simple hook 62, which has a dual purpose, one being to support the front part of the seat 28 from the torsion bar 34, and the second purpose is to lock or secure the links 50 against the legs 40 of torsion bar 34 and between the spaced ears 58 thereof by extending through holes 64, which pierce the ears 58 and closely receive the hooks 62 therethrough. The lower ends of the chain 60 also preferably have snaphooks 66 connected thereto for purposes of securing the lower ends of the chains to the front part 32 of the rigid frame of the seat. In the preferred construction, suitable positioning means for the hooks 66 may be provided on said frame. One practical embodiment of such positioning means comprises a pair of spaced balls 68, which may be Welded or otherwise fixed to the frame 32 for purposes of receiving the hooks 66 therebetween. A pair of such balls 68 is provided respectively adjacent opposite ends of the horizontal front bar of the forwardly extending portion 32 of the frame of the seat.

When it is desired to store the swing unit, it is only necessary to collapse the horizontal braces 26, move the lower ends of the legs 20 into close relationship with each other, as shown in FIG. 2, disconnect the hooks 66 from the front part 32. of the frame of the seat 28, and permit the seat to be disposed in hanging relationship, as also shonw in FIG. 2, whereupon the collapsed swing assembly may be stored within a relatively small space, such as in a closet, or easily can be carried in the deck or rear seat compartment of a motor vehicle, or the like. Restoring the swing unit to operative position merely requires the spreading of the legs of each pair, snapping the brace members 26 into extended position, and connecting the hooks 66 with the forward portion of the frame of the seat 28, such operation merely requiring a few seconds time.

While the swing construction thus far described is capable of satisfactory use for the enjoyment of infants occupying the seat 28, or by children playing with dolls disposed in the seat, for exam le, whereby it is only necessary to push the seat 28 lightly so as to swing the same in oscillating manner from the pivotally supported torsion bar 34, the present invention contemplates that the swing may be operated by power means comprising an exemplary power unit 70, which is secured by appropriat bolts, bent ears, or the like, not shown, to the interior of the head 10. Said power means, as illustrated, primarily is intended to be exemplary, since it may comprise an electric motor and suitable mechanism attached thereto and operated thereby so as to oscillate a driving lever 72, which depends from the lower portion of the power unit 70, as best shown in FIG. 5, but also as shown in FIG. 3. The lower end of the lever 72 preferably has a notch 74 which receives the central portion 38 of torsion bar 34. For convenience in not having the lever 72 of undue length, the central portion 38 is provided with a hump 76, which extends upwardly and the middle portion of said hump is disposed within the notch 74 of lever 72, as clearly shown in FIG. 3.

In the form illustrated in the present drawings, it is contemplated that the power unit shall be spring driven, employing any appropriate actuating means, not shown, by which the lever 72 is oscillated. The spring power principally is derived from a coiled spring, which is wound through the means of a crank 78 having a suitable knob 80 on the outer end thereof. The inner end of crank 78 may be threaded, or otherwise secured, preferably detachably, to a winding arbor 82 for the spring of the power unit 70, as best shown in FIGS. 9 and 10. The arbor 82 is of the type which is wound unidirectionally, and such movement is assured by an appropriate clutch 84, a simple form of which can comprise a coiled spring of slightly smaller diameter than the outer diameter of arbor 82. One end of the coil is fixed to the housing of the power unit 70 by a screw 86, while the opposite end comprises a protruding ear 88 by which, if desired, the clutch may be released simply by moving the ear 88 in a direction to enlarge the coil of the clutch 84.

When the power unit 70 is energized, such as by winding the spring thereof through the medium of crank 78, the driving lever 72 commences to oscillate and thereby oscillates the torsion bar 34 about its pivots in the ends of the head 10, successively in opposite directions through a desired range of movement indicated in exemplary manner by the two dotted line illustrations of the lever 72 in FIG. 5 respectively on opposite sides of the full line illustration thereof in said figure. The maximum extent of such oscillation is controlled by the actuating means for the lever 72. The power cycle for the unit 70 may be of any desired duration, such as for a period of 10 or 15 minutes, or any other period desired of which the unit is capable of being energized.

Especially for purposes of facilitating the packaging of the swing unit for merchandising and transporation, as has been indicated above, the legs preferably are formed from a plurality of sections, the opposite ends of which telescope with respect to each other, somewhat in the manner illustrated exemplarily in FIGS. 11 and 12. For example, the upper end of each section of the leg 20 comprises a projection'90, the outer diameter of which preferably snugly engages the inner diameter of the socket portion 92 on the lower end of each section of the leg 20. To provide additional friction, one preferred means suitable for use comprises a spring member 94-, which is secured at its lower end, by any suitable means, within the interior of the projection 90, and the upper end thereof, which projects beyond the projection 90, has opposed engaging portions 96, which frictionally engage the interior of the socket portions 90' on the lower ends of the adjacent leg sections. Such means permits ready connection and disconnection of the sections of the legs with respect to each other, without interfering with the operation or requiring any tools to accomplish such connection and disconnection. The projections 90 and socket portions 92 preferably are of appreciable length so as to afford adequate rigidity when the sections of the legs 20 are assembled. As shown in FIG. 1 in exemplary manner, each leg 20 comprises three of such sections in each leg.

In addition to the legs 20 being composed of a plurality of quickly connected and disconnected sections so as to render the swing unit capable of being packaged compactly, it will be seen also from FIG. 3 that, after the rigid links 50 have been disconnected from the seat 28, they may be swung to the dotted line positions thereof shown in FIG. 3 and, after being so disposed and upon moving the uppermost sections of the legs 20, which are pivotally connected to the head 10, into the compacted or collapsed position shown in FIG. 2, it can be visualized that said collapsed upper portion of the entire swing unit may be disposed within a suitable carton of moderate size. The seat 28, preferably being covered with flexible material, such as appropriate fabric, readily may be collapsed into relatively flat condition and disposed within the carton between the collapsed leg sections. The two additional telescopically connectable sections of each leg, making a total of eight additional sections in all, also readily may be disposed within such carton. The chains 60, likewise, readily are collapsible into the interior of the carton and upon the links 78 being disconnected from the power unit, they also simply may be dropped into the carton and the carton then sealed, along with an appropriate instruction sheet as to how the unit is to be unpacked and assembled.

From the foregoing, it will be seen that the present swing construction comprises an extremely simple yet highly durable and effective pleasure-affording toy for a child or infant, either disposed within the seat of the swing unit, or for a child to play with dolls seated within the swing. The torsion bar construction serves in the dual capacity not only of pivotally supporting the seat and suspended supporting means for the seat relative to the head, but, also, because of the function of its configuration, affords ready means of bracing rigid supporting links which depend from the torsion bar and are connected effectively to substantially vertical legs thereon in such manner as to minimize lateral movement of the seat of the swing in directions substantially parallel to the longitudinal axis of the head 10. The torsion bar has been designed upon a well recognized theory of mechanical vibration that the initial force applied to a pendulum, which is the torsion bar above, obtains the maximum oscillation or amplitude when such initial force is applied at the natural frequency of the pendulum. As a result, only a minimum amount of such initial force is required and all of the manual or power force applied to the swing to push it during operation also is forcibly channeled by this designed operation of the torsion rod into a vertical plane perpendicular to the axis of the torsion bar. This is due to the fact that no appreciable wobble or sideplay is permitted, whereby a longer ride, as well as a very smooth and gentle ride, is produced to induce pleasure and even sleep in a young child. Of equal importance is the providing of maximum safety to the occupant due to substantial freedom from danger of the swing toppling over.

To insure maximum advantages of the foregoing improvements and possibilities, it is essential that the dimensions and manufacturing tolerances be relatively close and observed in the production of the swing, and particularly those parts thereof which contribute to the minimizing of lateral sway or vibration which could contribute to accidents resulting from the operation of the swing. Further, the U-shaped configuration of the torsion bar and the rigidity thereof against deflection results in maximum swinging efficiency when the swing is energized either manually or by powered driving means applied to the torsion bar so as to oscillate the same automatically, when desired. In addition to such minimizing of lateral movement of the seat with respect to the supporting head of the swing unit, the particular arrangement of legs and the means connecting the same to the head is such as likewise to afford maximum bracing of the entire unit, and especially the head, against longitudinal or lateral movement, relative to the plane within which the swing oscillates, thereby affording maximum safety to the occupant of the swing, as well as affording a smooth, lulling ride.

While the invention has been described and illustrated in its several preferred embodiments, and has included certain details, it should be understood that the invention is not to be limited to the precise details herein illustrated and described since the same may be carried out in other Ways falling within the scope of the invention as claimed.

I claim:

1. A swing for juvenile use comprising in combination, a head having spaced ends, supporting legs depending downward and outward from said head adjacent said ends thereof to said torsion bar and suspended therefrom, ported respectively by said ends of said head and having rigid means depending downwardly from the pivotal axes of said ends of said bar and spaced apart transversely of said bar, a seat, supporting means for said seat extending upwardly therefrom and connected at the upper ends theerof to said torsion bar and suspended therefrom, means connecting said supporting means and rigid depending means on said bar at a location below the pivotal axis of said torsion bar for pivotal movement of the same in unison, power means supported by said head independently of said torsion bar, and driving means operated by said power means and engaging said rigid means depending downwardly from said torsion bar and operable to oscillate said torsion bar about the pivotal axis thereof to move the seat of the swing in similar oscillating manner.

2. The swing set forth in claim 1 further characterized by said driving means comprising a lever oscillated by said power means independently of said torsion bar and the lower end portion of said lever engaging the depending means of said torsion bar with sufiicient force to oscillate the same with minimum power.

3. The swing set forth in claim 1 further characterized by said head comprising an inverted trough and the ends thereof having inturned flanges provided with axially aligned slot means of limited length, and said head further including means pivotally connecting the upper ends of said legs to said ends of said head and said legs extending through said slot means to restrict the pivotal movement thereof and also brace said legs against movement in directions transverse and longitudinal relative to said head when said legs are extended to normal supporting position thereof relative to said head.

4. The swing set forth in claim 3 further characterized by said ends of said head extending downward and outward from each other and said legs being substantially parallel thereto, thereby extending outward and down- Ward in both transverse and longitudinal directions relative to said head to provide firm bracing of said swing against movement in said directions when being operated with an occupant in said seat.

5. A childs swing comprising in combination, a horizontal elongated head having opposite ends, supporting legs connected at one end to said head adjacent the ends thereof and extending downward and outward therefrom, a substantially U-shaped torsion bar having pivot means adjacent the outer ends of the legs of said bar pivotally supported by said head and said legs of said bar depending from said pivots thereof, a seat, supporting means for said seat comprising a plurality of parts, certain of said parts of said supporting means being rigid and depending from said torsion bar for support of said seat by said bar, connecting means on said legs of said torsion bar comprising spaced ears receiving said rigid supporting means therebetween to secure the same to said legs, and books on other parts of said supporting means extending between the ends of said ears and operable to prevent removal of said rigid supporting means from between said ears, whereby said supporting means and seat oscillate in unison with said torsion bar.

6. The childs swing set forth in claim 5 further characterized by said other parts of said supporting means comprising elongated fiexible means extending upward from said seat and said hooks being connected to the upper ends thereof.

7. The childs swing set forth in claim 5 further characterized by said seat having a relatively rigid frame having an upwardly extending back part and a forwardly extending front part, said rigid parts of said supporting means comprising rigid elonated links connected to said back part of said seat frame and said other parts of said supporting means comprising flexible chains connected to the front part of said seat frame.

8. The childs swing set forth in claim 7 further including means pivotally connecting the upper ends of said legs to the ends of said head and operable to permit the lower ends of said legs to be moved toward each other to render the swing compact for storage and said seat upon disconnection of said chains from said seat permitting said seat to be suspended downward from said rigid links in a compact manner relative to said legs.

9. A swing suspension comprising a horizontally arranged support housing having a pair of spaced apart end wall supports; a horizontally arranged torsion bar made of stiff, rod-like material and having its opposite ends each rotatably connected to one of said end wall supports, the central portion of said torsion bar being bent into an upwardly opening, deep U-shape whose legs are substantially vertically arranged and whose base is horizontally arranged, with the base and legs joining at relatively sharp bent corners; a motor supported in said housing, the motor having a driven, reciprocating lever extending downwardly therefrom and being connected to the center of said base for reciprocating said torsion bar about its rotatably connected ends; a swing having a pair of elongated, upright arranged swing support rods, each arranged adjacent to one of said legs and having its upper end connected to the torsion bar at a point located between the respective leg and torsion bar end and extending downwardly at an angle to the vertical to contact its respective leg just above its connection to said horizontally arranged base, the rods further extending downwardly in contact with its respective leg and then extending further downwardly and having its lower end located at a considerable distance beneath the torsion bar with the lower end being formed with means for connection to said swing; means connecting the upright rods to their respective legs at the bent corners where the legs join said base.

10. A construction as defined in claim 9 and including a shallow, upwardly opening, U-shaped bend formed in the torsion bar between each of said legs and the torsion bar ends adjacent respectively thereto; and a bent loop formed on the upper end of each support rod, the upper ends of each support rod being connected to the torsion bar by means of said loops each being looped around the base of the shallow U-shaped bend located adjacent its respective legs.

References Cited UNITED STATES PATENTS 3,128,076 4/1964 Di Pasqua 248-370 FOREIGN PATENTS 326,634 3/ 1930 Great Britain. 499,812 2/ 1954 Canada.

RICHARD C. PINKHAM, Primary Examiner THOMAS ZACK, Assistant Examiner US. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3128076 *Sep 28, 1962Apr 7, 1964Mechanical Swinging Cradle CorTorsion bar assembly for mechanical swing
CA499812A *Feb 9, 1954Giovanni LalloSafety swing
GB326634A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3648307 *Jan 15, 1970Mar 14, 1972James R MeadeChild{40 s article of furniture
US3794317 *Jan 19, 1971Feb 26, 1974Jenkintown Metal Prod IncAutomatic swing
US3806117 *Feb 28, 1972Apr 23, 1974Foster ESpring powered swing
US4022510 *Nov 5, 1975May 10, 1977Graco Metal Products, Inc.Seat for baby swing
US4693512 *Oct 3, 1986Sep 15, 1987Hobson J DavidSwing seating unit
US5378196 *Sep 15, 1992Jan 3, 1995Cosco, Inc.Child swing
US5525113 *Oct 13, 1994Jun 11, 1996Graco Childrens Products Inc.Open top swing & control
US5562548 *Nov 4, 1994Oct 8, 1996Cosco, Inc.Convertible child swing
US5769727 *Dec 27, 1996Jun 23, 1998Lisco, Inc.Swing
US5803817 *Aug 15, 1996Sep 8, 1998Fisher-Price, Inc.Infant swing
US5975631 *Jun 22, 1998Nov 2, 1999Evenflo Company, Inc.Swing with recline mechanism
US5984791 *Jun 22, 1998Nov 16, 1999Evenflo Company, Inc.Swing with pivotable tray
US6022277 *Jun 22, 1998Feb 8, 2000Evenflo Company, Inc.Swing with drive mechanism
US6958017 *Aug 29, 2004Oct 25, 2005Toombs Jr Billy APortable swing assembly
US7455593Feb 14, 2006Nov 25, 2008O'neill Kevin JLayback swing and swing attachment
US8407832Sep 28, 2009Apr 2, 2013Mattel, Inc.Infant support structure with a collapsible frame
WO1996011731A1Oct 5, 1995Apr 25, 1996Graco Children's Products, Inc.Open top swing and control
Classifications
U.S. Classification472/119, 297/277, 248/370, 297/274
International ClassificationA63G9/16
Cooperative ClassificationA47D13/105, A63G9/16
European ClassificationA63G9/16