Abstract: A racket comprised of a frame connected to a handle wherein the frame has a retaining channel that extends around its outer periphery. The frame also has a plurality of holes extending therethrough for receiving individual strings. Slidable within the retaining channel are a plurality of retaining members that have recesses in their end portions. The recesses serve to define string holes when the retaining members are placed together. Each of the strings has a portion of increased extent at each end such that the strings can be passed through the frame hole while at the same time being secured to the frame by way of the string holes on the retaining members. Since the string holes in the retaining members are smaller in size than the portion of the string of increased extent, the strings are held in place in the frame.

Abstract: A racquet, for tennis or the like, and a method for stringing racquets. The racquet has a handle, a frame, and a plurality of strings spanning the frame in two groups. A first group is generally parallel to the handle and a second group is generally perpendicular to the handle. Each string spans the frame once and has retaining means on each end for maintaining the string taut while spanning the frame. An apparatus for determining the distance between retaining means on each end of a string for making a single span of a racquet frame includes at least one first position and a plurality of second positions on a surface. A taut string, having a first retaining means at a first position and a second retaining means at a second position, has a predetermined tension when placed in the frame. An apparatus for stringing a racquet includes a body portion for fitting onto the frame and a winch key rotatably on the body portion.

Abstract: A tank in the form of a spherical wall having a discharge opening at the bottom thereof with a seat surrounding this opening. An inlet opening having a cover is provided at the top of the spherical wall. A plug in the chamber is positioned to engage the seat and thereby close the discharge opening. Operating means connected to the plug is operable selectively to move the plug onto and off the seat to close and open the discharge opening to retain fluid substance in the chamber and allow this substance to flow out of the chamber, respectively.