Bracket

This application claims priority under U.S. law to provisional U.S. patent applications Ser. No. 60/229,623, filed Aug. 31, 2000 and which is incorporated in its entirety by this reference.

This invention relates to hardware for connecting wooden members in rigid relation in general, and in particular to an A-frame bracket for securing A-frame members to an overhead beam in playground equipment.

Play structures for the entertainment and exercise of children have long been in use. Particularly popular with children has been the swing set which consists of an overhead beam supported on opposite ends by frame members with chairs or seats suspended from the overhead member on chains or ropes. Swing sets or other play structures may be constructed of metal or plastic, but metal is costly and prone to rust, and plastic tends to lack the necessary strength to stand up to heavy use by children. Swing sets may also be constructed from modern weather-resistant treated timber which is strong and durable and does not require painting. Wooden sets present a rugged and attractive appearance and are not subject to rusting.

Because of the bulk and weight of assembled play structures they are rarely shipped from the manufacturer in assembled form, but are often sold as kits for home assembly by the consumer. Because the swing set features the intersection of a number of angled beams, fabrication of swing sets from standard timber lengths without specialized hardware has been restricted to professional carpenters and skilled hobbyists. A play set must be rigidly braced and the structure must be capable of withstanding forces and loads in addition to those due to the swinging motions of the suspended seats.

All-wood playsets have long been known to the art, but wood joinery requires advanced carpentry skill. Previous hardware kits for constructing wooden play sets are also known.

For example, U.S. Pat. No. 4,966,309 to Baer discloses a swing assembly hardware kit. The kit includes 4 brackets for joining together the A-frame to the overhead beam at each end of the swing. The use of multiple brackets in joining the A-frame to the overhead beam leads to several disadvantages. First, the placement of the brackets becomes critical because each bracket must align with the other brackets. In addition, a multi-bracket system lacks the necessary integrity to properly secure the A-frame to the overhead beam. Moreover, as forces are exerted upon the swing set, the connection may loosen due to the multi bracket set-up.

Another example of a bracket system used to join an A-frame to an overhead beam for a swing set can be found in U.S. Pat. No. 5,364,312 to Cunard et al. Cunard discloses a two piece bracket system. The first bracket is a trapezoidal stamped metal plate with side flanges and an outwardly extending top flange. The second bracket is an elongated stamped metal part with an inverted U-shaped cross section formed from a top rectangular surface and two generally triangular side walls (webbing). The bracketing system disclosed in Cunard suffers from the same disadvantages as the bracketing system disclosed in Baer. For example, because the A-frame bracket is formed from two separate pieces, it lacks the stability provided by a one piece system. In using the Cunard bracket, each A-frame member is only secured to a flat flange on the second bracket with the trapezoidal bracket mounted opposite the second bracket, as shown in FIG. 5 of the Cunard patent. However, in this configuration there is no direct connectivity between the two separate brackets thereby resulting in an inferior weak joint in comparison to the one piece bracket design of the present invention. Thus, as the swing set is used over time the brackets forming the joint may become loose from the forces exerted upon the play set by the user. Furthermore, a two piece system also is more difficult to install because the brackets must be properly aligned to gain maximum stability. Finally, the Cunard design provides screw holes that align close to the edges of the members. This configuration may cause the wood members to split or splinter either during installation or during actual use of the play set resulting in a weak unstable connection.

Thus, what is needed is a one piece A-frame bracket that provides maximum stability, has no welded joints, is made from heavy gauge metal and is user friendly.

FIG. 1 is a perspective view of a preferred embodiment of the present invention.

FIG. 2 is a top view of another embodiment of the present invention.

FIG. 3 is an end view of the embodiment in FIG. 2 shown secured to A-frame members and an overhead beam of a play structure.

An A-frame bracket 10 of the present invention is used to secure A-frame members of a swing set to an overhead cross beam as shown in FIG. 3 . Bracket 10 is made from a one-piece construction of heavy gauge metal, which contains no welded joints. The unibody is stamp forged and the exterior is completely powder coated and baked at 300 degrees for maximum longevity.

Looking to FIG. 1, bracket 10 has a rectangular top 12 , and two rectangular side walls, 14 and 16 , that each extend at an angle downwardly from rectangular top 12 . The downwardly sloping side walls 14 and 16 each have an integrally formed flange 15 and 17 . Flanges 15 and 17 may be of any shape, but in the preferred embodiment, flanges 15 and 17 are rectangular in shape. Top 12 , sides 14 and 16 and flanges 15 and 17 each have holes 13 stamped through the metal material for receiving large bolts. The wood members are held in place by drilling matching bolt holes through the wood for receiving the bolts. Since equivalent bolt holes must be placed into the wood members, the placement of the bolt holes in bracket 10 is important, so as not to cause the wood to split. Therefore, bolt holes 13 are centered on bracket 10 , so that the corresponding bolt holes in the wood members lie on the center line of the member and not along the edges of a member, as seen in FIGS. 2 and 3.

FIG. 3 discloses how bracket 10 is configured to secure the A-frame members 23 and 24 to overhead beam 21 . First, overhead beam 21 is secured to the upper side 12 a of top 12 using, for example, multiple nut and bolt combinations 22 . A-frame members 23 and 24 are then secured within the “L” shape structure formed by side walls 14 and 16 and flanges 15 and 17 , respectively, using, for example, several nut and bolt combinations 22 . In this configuration, the 4×4 A-frame members can be drawn into the comer of the “L” shaped structure creating a secure stable mounting. This is possible because two sets of nut and bolt combinations are used to secure and draw each A-frame member 23 and 24 in the “L” shaped structure, as shown in FIG. 3 .

Additionally, A-frame bracket 10 provides a secure and stable connection by balancing various forces. For example, A-frame members 23 and 24 exert an upward vertical force (shown by arrows B) that opposes a downward vertical force (shown by arrow C). Moreover, because bracket 10 consists of a unibody design, it facilitates a low cost, highly effective device for erecting play systems.