초록 ▼

Apparatus for casting concrete septic tanks, burial vaults and the like includes an inner form and an outer form. The inner form includes apparatus for positively locking the cover plate to the inner form as the walls thereof are expanded. The inner form, also, includes an improved mode for expandin

Apparatus for casting concrete septic tanks, burial vaults and the like includes an inner form and an outer form. The inner form includes apparatus for positively locking the cover plate to the inner form as the walls thereof are expanded. The inner form, also, includes an improved mode for expanding same.

대표청구항 ▼

In apparatus for casting of the type including an outer form and an inner form, the inner form being of the type having horizontally translatable collapsible and expandable side walls and end walls, each of said walls being centrally hinged along the vertical extent thereof, means for expanding and

In apparatus for casting of the type including an outer form and an inner form, the inner form being of the type having horizontally translatable collapsible and expandable side walls and end walls, each of said walls being centrally hinged along the vertical extent thereof, means for expanding and collapsing the side walls and end walls by the horizontal translation thereof, the means including a central shaft, a rod associated with each wall and extending from the shaft to a mounting bracket connected to the associated wall, and a cover plate engageable with the top edges of the walls, the improvement which comprises: a. means for moving the cover plate secured to the cover plate and interconnected to at least the end walls, the means for moving being responsive to the means for expanding and collapsing such that upon expansion of the walls by the horizontal outward translation thereof the cover plate moves into engagement with the edges of the walls simultaneously with the expansion of the walls.