초록 ▼

A building form into which concrete may be poured to form a column or similar structure includes a plurality of stacked form units having interconnected expandable and contractable joints. The application of a vertically upward force to the joints of the uppermost form unit causes all the units to m

A building form into which concrete may be poured to form a column or similar structure includes a plurality of stacked form units having interconnected expandable and contractable joints. The application of a vertically upward force to the joints of the uppermost form unit causes all the units to move together, first laterally outwardly and then upwardly to strip the form from the column. The form thereafter may be moved to another location where the joints of the form units may be contracted to provide a form for pouring another column. The joints include movable portions which are cammed outwardly or inwardly depending on the direction of vertical movement of a central, vertically movable portion. The camming action occurs by the action of cams carried by the vertically movable portion urging cam followers mounted on the movable portions to move side members of the form units away from the column when the form is being stripped from the column, and to urge the side members inwardly when the form is being moved to a position where another column is to be poured. The form according to the invention eliminates the need to remove a plurality of fasteners on each form unit prior to removal of the form from the column, and it also eliminates the need to reinsert a plurality of fasteners in the form units to reassemble the form. The entire form-stripping, form-movement, and form-reassembly technique can be carried out by the application of a vertical force from a mechanism such as a conventional erecting crane.

대표청구항 ▼

A form for making concrete structures, comprising: (a) a first side member defining at least one side of the form and a second side member defining at least another side of the form, the first and second members when connected to each other defining a concrete-receiving volume; and (b) a joint conne

A form for making concrete structures, comprising: (a) a first side member defining at least one side of the form and a second side member defining at least another side of the form, the first and second members when connected to each other defining a concrete-receiving volume; and (b) a joint connecting the first and second side members to each other along an edge, the joint having a vertically movable member operably connected to the first and second side members such that movement of the vertically movable member to a first position causes the first and second side members to move relative to the concrete-receiving volume to an open position and movement of the vertically movable member to a second position causes the first and second side members to move relative to the concrete-receiving volume to a closed position.