Drainage ditch mule
First Claim
1. A ditch paving tool adapted to form a continuous layer of concrete along a sloping wall and top birm of a graded ditch upon being propelled therealong by a prime mover comprising:
- an open-bottomed hopper for said concrete including front and rear spaced walls, an inside wall defining the edge of said concrete layer over said birm and an outside wall defining the edge of said concrete along the bottom of said sloping wall of said ditch;
said front wall of said hopper having its bottom edge contoured to correspond to said graded ditch and birm;
the bottom edge of said rear wall being offset above the contour of the bottom edge of said front wall to define the contour of the top surface of said concrete layer; and
said rear wall including an integral slip form means comprising a rearwardly extending plate conforming longitudinally to the contour of said bottom edge of said rear wall and having a second inside wall coextensive with the inside wall of said hopper defining the edge of said concrete layer over said birm.
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Accused Products
Abstract
A slip form or mule for continuously laying concrete along the contoured side wall and top edge of a drainage ditch. The slip form is affixed to or pivotally mounted from the side of a construction machine that travels along the top side of the ditch. An integral open-bottomed sloping hopper feeds concrete to the slip form which has an adjustable top wall extension and an extendable end wall and sides that simultaneously adjust and are guided on the top slanted wall of the slip form to form a concrete slab of different widths. The frame also supports a trailing screed that is pivoted from and supported by one or more biased bell cranks and canted toward the slope of the ditch side. The hopper has a series of adjustable weirs and vibrating means to spread and consolidate the concrete before the front opening of the slip form. The top inside wall of the slip form and back bottom wall of the hopper may also be pivoted about a longitudinal axis to maintain the inside wall of the slab vertical as the height of the slip form is varied.
37 Citations
10 Claims
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1. A ditch paving tool adapted to form a continuous layer of concrete along a sloping wall and top birm of a graded ditch upon being propelled therealong by a prime mover comprising:
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an open-bottomed hopper for said concrete including front and rear spaced walls, an inside wall defining the edge of said concrete layer over said birm and an outside wall defining the edge of said concrete along the bottom of said sloping wall of said ditch; said front wall of said hopper having its bottom edge contoured to correspond to said graded ditch and birm; the bottom edge of said rear wall being offset above the contour of the bottom edge of said front wall to define the contour of the top surface of said concrete layer; and said rear wall including an integral slip form means comprising a rearwardly extending plate conforming longitudinally to the contour of said bottom edge of said rear wall and having a second inside wall coextensive with the inside wall of said hopper defining the edge of said concrete layer over said birm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A ditch paving tool adapted for attachment to the side frame of a prime mover to be transported thereby to form a continuous layer of concrete along a sloping wall and top birm of a graded ditch comprising:
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an open-bottomed hopper for said concrete including front and rear spaced walls, an inside wall defining the edge of said concrete layer over said birm and a transversely adjustable outside wall defining the edge of said concrete along the bottom of said sloping wall of said ditch; the front wall of said hopper having its bottom edge contoured to said graded ditch and birm; the bottom edge of said rear wall being offset above the contour of the bottom edge of said front wall to define the contour of the top surface of said concrete layer; said rear wall including an integral slip form means comprising a rearwardly extending flat plate conforming longitudinally to the contour of said bottom edge of said rear wall and having a second inside wall coextensive with the inside wall of said hopper defining the edge of said concrete layer over said birms; said adjustable outside wall of said hopper having a pair of side walls attached to the front and rear edges and extending on the outsides of and in sliding contact with the front and rear walls of said hopper; one of said sliding walls being adjacent said front wall of said hopper and having its bottom edge substantially on the plane of the bottom edge of said front wall of said hopper; the second of said side walls being adjacent said rear wall of said hopper and having its bottom edge in sliding relationship over the rearwardly extending plate of said slip form; a web wall extending rearwardly of the bottom edge of said second sliding side wall of said hopper with its under surface also in sliding relationship over the top of said rearwardly extending plate of said slip form and defining therewith a longitudinal offset on the under surfaces; hold-down means to retain said web wall in said sliding relationship uon said rearwardly extending plate of said slip form under pressure of concrete thereunder; a pan-shaped screed member trailing the rear end of said slip form and having a transverse width about equal to the width of said slip form along said sloping wall; said screed member having a rounded front edge extending transverse and at an angle to the rear end of said slip form, said angle opening toward the top of the sloping wall of said ditch; and means to resiliently suspend said screed member behind said slip form in pressure contact with said concrete layer being formed and with its lower trailing corner over said off-set whereby to form a flat top surface in said concrete layer.
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Specification