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US 4,253,814 AGranted
Packerhead and core control system
AssigneeHydrotile Canada Limited
InventorAlfred W. Christian
Life of this patent
Estimating the term…
Abstract
A concrete pipe making machine having a packerhead vibrating core and a control for automatically controlling the movement of the packerhead and core relative to each other as the packerhead and core move up and down within a mold to form a concrete pipe. The control has valve units operable to restrict the flow of hydraulic fluid supplied to the hydraulic control cylinders which control the movements of the packerhead and core.
Claims36
A machine for making concrete pipe comprising:
- an upwardly extended frame, a cross head having a motor and gear box, first guide means mounted on the frame supporting the cross head for movement in a vertical direction, a packerhead connected to the gear box whereby on operation of the motor the packerhead is rotated, first hydraulic cylinder means connected to the cross head to move the cross head in said vertical direction, a turntable for supporting an upright mold in vertical alignment with the packerhead, said turntable being movable to locate the mold in an off-bearing station, an upright cylindrical core located below the turntable in axial alignment with the packerhead, vibrator means mounted on the core for vibrating the core, a support connected to the core, second guide means mounting the support for movement in a vertical direction, second hydraulic cylinder means connected to the support to move the support and core in the vertical direction, means for supplying hydraulic fluid under pressure to the first and second hydraulic cylinder means to move the packerhead and core upwardly into the mold and retract the core from the mold, means for supplying concrete to the mold during the time the packerhead moves upwardly into the mold whereby the packerhead forms a concrete pipe in the mold, control means operatively connected to the first and second hydraulic cylinder means for controlling the movement of the packerhead and core relative to each other whereby the core is maintained in closed spaced relationship below the packerhead during movement of the packerhead and core in an upward direction and during movement of the packerhead and core in a downward direction.
A machine for making concrete pipe comprising:
- an upwardly extended frame, a cross head having a motor and gear box, first guide means mounted on the frame supporting the cross head for movement in a vertical direction, a packerhead connected to the gear box whereby on operation of the motor the packerhead is rotated, first hydraulic cylinder means connected to the cross head to move the cross head in said vertical direction, a turntable for supporting an upright mold in vertical alignment with the packerhead, said turntable being movable to locate the mold in an off-bearing station, an upright cylindrical core located below the turntable in axial alignment with the packerhead, vibrator means mounted on the core for vibrating the core, a support connected to the core, second guide means mounting the support for movement in a vertical direction, second hydraulic cylinder means connected to the support to move the support and core in the vertical direction, means for supplying hydraulic fluid under pressure to the first and second hydraulic cylinder means to move the packerhead and core upwardly into the mold and retract the core from the mold, means for supplying concrete to the mold during the time the packerhead moves upwardly into the mold whereby the packerhead forms a concrete pipe in the mold, control means operatively connected to the first and second hydraulic cylinder means for controlling the movement of the packerhead and core relative to each other whereby the core is maintained in closed spaced relationship below the packerhead during movement of the packerhead and core in an upward direction and during movement of the packerhead and core in a downward direction, said control means including first valve means to restrict the flow of fluid from the lift end of the first hydraulic cylinder means, second valve means to restrict the flow of fluid from the retraction end of the second hydraulic cylinder means, and means responsive to the position of the packerhead and core relative to each other for actuating the first valve means and second valve means to maintain a selected distance between the packerhead and core during the forming of the concrete pipe.
A control arrangement for a packerhead and vibrating core machine for making a concrete product in a mold, said machine having a rotatable packerhead, first means to move the packerhead into and out of the mold, a vibrating core longitudinally aligned with the packerhead, and second means to move the core into and out of the mold, said control arrangement comprising:
- control means operatively connected to the first and second means for controlling the movement of the packerhead and core relative to each other whereby the core is maintained in close spaced relationship to the packerhead during movement of the packerhead and core in an upward direction and during movement of the packerhead and core in a downward direction.
A machine for making concrete product in a mold comprising:
- a rotatable packerhead, first means to move the packerhead into and out of the mold, a vibrating core longitudinally aligned with the packerhead, second means to move the core into and out of the mold, control means operatively connected to the first and second means for controlling the movement of the packerhead and core relative to each other whereby the core is maintained in close spaced relationship to the packerhead during movement of the packerhead and core in an upward direction and during the movement of the packerhead and core in a downward direction.
A machine for making concrete product in a mold comprising:
- a rotatable packerhead, fluid operated first means to move the packerhead into and out of the mold, a core longitudinally aligned with the packerhead, fluid operated second means to move the core into and out of the mold, control means operatively connected to the first and second means for controlling the movement of the packerhead and core relative to each other whereby the core is maintained in close spaced relationship to the packerhead during movement of the packerhead and core in an upward direction and during the movement of the packerhead and core in a downward direction, said control means including a first valve means to restrict the flow of fluid flowing from the first means thereby controlling the speed of operation of the first means, second valve means to restrict the flow of fluid from the second means and thereby control the speed of operation of the second means, and means responsive to the position of the packerhead and core relative to each other for actuating the first valve means and second valve means to maintain a selected distance between the packerhead and core during the forming of the concrete product.
A control arrangement for a machine having a first movable means and a second movable means, first means to move the first movable means, said second movable means being longitudinally aligned with the first means, and second means to move the second movable means, said control arrangement comprising:
- control means operatively connected to the first and second means for controlling the movement of the first movable means and second movable means relative to each other whereby the second movable means is maintained in close spaced relationship to the first movable means during movement of the first movable means and second movable means in a first direction and during movement of the first movable means and second movable means in a second direction opposite the first direction.
Dependencies are inferred from the claim text.