Pipe mold having insert support means
OwnerBobbie D. Peacockinventor
Life of this patent
Estimating the term…
Abstract
Concrete pipe is molded between concentric steel cylindrical shells in which there are openings on each side receiving plastic inserts defining respective keyed cavities that remain in the molded concrete pipe after curing and removal of the concentric steel shells so that large keyed eye-bolts may be inserted in the respective keyed inserts. The initial positioning of the plastic mold keyed insert is accomplished by means of a keyed plastic plunger mounted on an attaching plate which includes notches on each side to fit over attaching screws on each side of the outside steel shell. The plunger has a keyed end. The hollow plastic insert with a soft gasket around the top has a keyed plunger inserted under pressure therein for removal therefrom and replacement by the eye-bolt after the curing of the pipe is completed.
Claims13
In an apparatus for providing lifting insert cavities in molded concrete pipe made from concrete which is poured into a pipe mold comprising rigid, inner and outer spaced shells and prior to the curing of the concrete poured therein:
- an inner shell and an outer shell fixed in spaced relation to each other to provide a mold in which poured concrete is placed in the space between said inner and outer shells to cure and form a rigid concrete pipe, said outer shell having at least one thru opening therein leading into the space between said inner and outer shells and receiving a cavity forming insert therethrough the cavity forming insert constructed from plastic or a similar material comprising an insert body of a size smaller than the opening in the outer shell whereby said cavity forming insert is inserted thru said opening from outside after said inner and outer shells are assembled to support said insert on said outer shell and in alignment with the opening therein, said cavity forming insert having an opening in the top thereof which when in position is exposed thru the opening in said outer shell and said insert opening leading into the interior and to a closed bottom in said insert, a retaining means detachably attached to said outer shell, means on said outer shell removably attaching said retaining means to said outer shell, means on said retaining means for positioning same in said insert body prior to insertion in said opening in said outer shell for a temporary but firm engagement therewith to attach same thereto for subsequent removal therefrom after the concrete pipe is cured, and to hold same in position between said inner and outer shells whereby said insert remains inside said concrete to receive a lifting insert therein.
In an insert positioning means for providing a specially shaped cavity on the side of a concrete pipe by placing said insert into position between the inner and outer shells of a pipe mold prior to the curing of concrete poured therein:
- a concrete pipe mold comprising rigid, concentrically arranged inner and outer shells and said outer shell having a respective cavity forming insert opening formed therein leading to the interior thereof, a cavity forming insert constructed from thin plastic or a similar material having an open top leading to a closed bottom, said insert having at least one channel leading to the bottom thereof and a respective tunnel at the bottom of each channel leading to an off-set recess therein, a retaining means comprising a retaining member including an elongated shaft, a mounting means on said retaining means temporarily attaching said retaining means to said outer shell about said insert opening, said retaining member having at least one projecting portion on the end thereof corresponding with a respective off-set recess formed in the bottom of said insert, spring means on said retaining member, said retaining member being pushed into said insert prior to the positioning of said insert in said pipe mold to cause said projecting portion to be located within said respective off-set recess after travelling down said channel and through said tunnel against the spring pressure on said retaining member thereby tightly positioning said insert on said retaining member and said retaining member in place on said outer shell whereupon after the pouring and curing of the concrete a cavity of special formation is left in said concrete pipe and defined by said cavity forming insert so that a lifting instrumentally, such as an eye-bolt may be inserted down into said cavity so formed by said insert and rotated into position in said respective off-set recesses whereby said pipe may be lifted from said eye-bolt thereby reducing the possibility of breakage.
Dependencies are inferred from the claim text.