| 摘要 |
<p>A base (12) is provided including first, second and third adjoining marginal portions (14, 16 and 20) with each marginal portion also including the adjacent half of a marginal zone (18) of the base. A first stationary wall (22) is fixedly secured to and projects upwardly from marginal portion (14). Second and third upstanding walls (26 and 28) are provided and are pivotally supported along upstanding base edge marginal portions thereof from remote upstanding marginal edge portions of the stationary wall (22) for swinging movement of the remote free upstanding marginal edges of the second and third walls (26 and 28) toward and away from closely juxtaposed portions defining a peripherally enclosed upstanding mold cavity (70) above the base (12) between the first, second and third upstanding walls (22, 26 and 28). The lower edges of the second and third walls (26 and 28) are disposed in reasonably good sealed relation with the second and third marginal portions (16 and 18) of the base (12). The base (12) defines an upwardly opening socket (58) centrally disposed relative to the cavity and an upstanding reinforcing member (60) is provided and has its lower end received in the socket (58). An upper end portion of the reinforcing member includes a horizontally outwardly projecting shank (62) supported therefrom and at least one of the free marginal edges of the second and third walls (26 and 28) has a notch (62) formed therein opening toward the free marginal edge of the other of the second and third walls (26 and 28) through which the outer end of the shank (62) projects. Horizontally aligned openings (86) may be provided in remote wall portions of the mold and have the opposite ends of a horizontal sleeve (90) projecting outwardly therethrough.</p> |
