Abstract: A serving tray is disclosed. The serving tray includes a planar shaped body having a length, weight, and height. The height is substantially less than the length and the width. An upward-facing surface of the tray has at least one cutout. A magnetic element is positioned inside each at least one cutout. A connecting element attaches each magnetic element to each cutout such that an upward facing surface of each magnetic element is substantially flush with the upward-facing surface of the tray.

Abstract: A ball delivering device for use in batting and racket swinging practice includes a stop and release assembly for reliably controlling the supply of an individual ball to a user's swing path while maintaining the remaining balls in a reservoir. The device is constructed to enhance safety and minimize risk or injury to unattended child users by incorporating an air pressure-actuated feeder for controlling the advancement of balls on an inclined, gravity-fed dispensing channel. The air-based feeder can be foot actuated so that the child may maintain a batter's stance while actuating the delivery of a ball to his swing path.

Abstract: A strong and lightweight adjustable slack adjuster is disclosed. The slack adjuster body portion includes, in one form thereof, an integral and a removable cover plate. In another form a pair of removable side cover plates are provided and are fixed to the slack body by deformation of a body rim over the cover plate edge. Other cover plate forms are deformable or resilient and include peripheral skirts which are expandable radially outwardly to fit within an annular groove in the body portion. Meshing worm gear and worm wheel means, which can be rotatably adjusted with respect to each other to thereby adjust the slack in a braking system, are positioned within the body. The worm wheel is supported by the body around its entire periphery to maximize the load carrying capacity of the slack while minimizing wear. The major portion of the worm gear is also supported by the body. Sealing means are positioned between the worm wheel and the cover plates to seal the worm gear and worm wheel from contaminants.