Handling system for precast units

• US 4,512,121 A
• Filed: 05/24/1983
• Issued: 04/23/1985
• Est. Priority Date: 05/24/1983
• Status: Expired due to Fees

• Current Assignee: Chahan Pacradouni, Roger Carydias
• Original Assignee: Chahan Pacradouni, Roger Carydias
• Inventors: Carydias, Roger, Pacradouni, Chahan
• Primary Examiner(s): Ridgill, Jr., James L.
• Application Number:
  US06/497,607
• Time in Patent Office: 700 Days
• Field of Search: 52/707, 52/710, 52/698, 52/711, 52/125.1, 52/125.2, 52/125.4, 52/125.5, 52/127.5, 52/235
• US Class Current: 52/125.2
• CPC Class Codes: E04G 21/142 Means in or on the elements for connecting same to handling apparatus E04B1/38 takes precedence

Abstract

A small reinforced cavity is made in the precast unit and opens at the surface of the unit through a restricted slot. An anchor member, having a transverse leg at its inner end, is inserted through the slot and rotated to 90° in secured position, so that the transverse leg will engage the surface of the cavity. The anchor member is firmly retained in secured position within the cavity. The outer end of the anchor member is either directly attached to a building structure for anchoring the precast unit in permanent position, or is fitted with a ring for use in hoisting and/or transporting the precast unit. The anchor member can be re-used. At least one safety pin is connected to the anchor member and is adapted to engage the slot to maintain the anchor member in its 90° secured rotated position.

Claims

1. In a handling system for a moldable element, such as a reinforced precast concrete panel, beam or the like, said element including a cavity formed therein adjacent an exposed surface of said element, said cavity communicating with the exterior at said exposed surface by a restricted slot, said cavity having a length at least equal to the length of said slot and a width greater than the width of said slot, said slot and cavity adapted to receive an anchor member having a main straight shank and a transverse leg at one end, the cross-sectional maximum dimension of said anchor member being smaller than the width of said slot and the length of said transverse leg being greater than the width of said slot and smaller than the width of said cavity, whereby said transverse leg can enter said cavity when oriented longitudinally of said slot, rotation of said anchoring member, about the axis of said main leg through a rotated position about a quarter turn, causing said transverse leg to extend in said cavity transversely to said slot and, therefore, secure said anchoring ember to said element, a base plate having a central hole through which the main leg of said anchor member rotatably extends, said base plase having an underface adapted to be applied flat against said exposed surface of said element over said restricted slot, safety pins fixed to said plate on each side of said central hole and protruding from its underface to engage said slot and prevent rotation of said base plate, a guiding support fixed to said base plate opposite said safety pins to rotatably guide said anchor member, said central hole having a lateral notch and said main leg of said anchor member having a laterally-extending lug to engage said notch to prevent rotation of said anchor member with respect to said base plate and guiding support, the outer end portion of said main leg of said anchor member being threaded and further including a nut screwed on said threaded portion and engaging said guiding support.

2. A handling system for a reinforced precast concrete element, such as a panel, beam and the like, comprising, in combination, such an element having an exposed surface, a rigid bar embedded in said element adjacent said exposed surface, an elongated slot opening at said surface and located adjacent said bar, said element having a cavity located inwardly of said bar and communicating with said slot, said cavity having a length at least equal to the length of said slot and a width greater than the width of said slot, said bar being exposed in said cavity and slot, an anchor member having a main straight leg and a transverse leg at its inner end, said main leg having a cross-sectional dimension to closely fit the width of said slot, said transverse leg having a length greater than the width of said slot and smaller than the width of said cavity, rotation of said anchor member about the axis of said main leg to a rotated position about a quarter turn causing said transverse leg to extend in said cavity transverse to said slot and to overlap said bar a hoisting ring carried by the outer end of said anchor member;

a support member, secured to said main leg of said anchor member and extending laterally therefrom, said support member being of tubular shape defining a base and a top;

a safety pin extending through aligned holes of said base and top, having a head overlying said top;

biasing means to bias said safety pin to a locking position in which its inner end protrudes from said base to engage said slot and lock said anchor member in said rotated position, and means to retract said pin to disengage from said slot.

3. A handling system as claimed in claim 2, wherein said biasing means is a compression spring surrounding said safety pin between said base and top.

4. A handling system for a reinforced precast concrete element, such as a panel, beam and the like, comorising, in combination, such an element having an exposed surface, an elongated slot opening at said surface, said element having a cavity communicating with said slot, said cavity having a length at least equal to the length of said slot and a width greater than the width of said slot, two spaced substantially parallel rigid bars embedded in said element, each of angle shape cross-section, each defining a first wing and a second wing, the first wings of said pairs of bars being exposed within said slot and defining the lateral surfaces of the same, the second wings of the pair of bars being oppositely directed and defining the surface of said cavity closest to and parallel to said exposed surface, an anchor member having a main leg and a transverse leg at the inner end, the transverse leg of said anchor member extending on opposite sides of said straight leg to define a T-shaped head with the T-shaped head engaging both second wings of said bars in the rotated position of said anchor member with respect to said slot and cavity;

a flanged sleeve member surrounding and rotatable about the main leg of said anchor member, a collar surrounding and rotatable about said sleeve and retained by the flanges of the same, a hoisting ring pivoted to said collar about an axis transverse to the long axis of said main leg, tightening means to tighten the transverse leg of said anchor member against said second wings of said angle bars within said cavity;

said sleeve member including a base plate having a central hole through which said main leg of the anchor member freely extends, said base plate being adapted to be positioned flat against said exposed surface of said element with said central hole in register with said slot, said central hole having a lateral notch and said main leg of said anchor member having a laterally-extending lug to engage said notch to prevent rotation of said anchor member with respect to said base plate and sleeve, said base plate having safety pins protruding from the underface thereof and engageable with said slot to prevent rotation of said base plate and sleeve with respect to said slot.

5. A handling system as defined in claim 4, wherein the outer end of said anchor member is threaded, and wherein said tightening means is a nut screwed on said main leg to engage said sleeve.