Abstract: A twine cutting apparatus in combination with an automated grass baler having a twine holding reel for feeding wrapping twine to the baled grass. The apparatus has a pivoted knife arm with a first end structured to cooperate with a cam surface for actuating the knife arm to a cutting position and an opposite end for mounting a twine cutting knife. The twine cutting knife is formed with an elongated, serrated cutting edge extending a distance greater than the radius of the twine holding disc presenting an elongated cutting surface to said twine.

Abstract: A framework of structural members having the appearance of a truss, for supporting concrete forms that mold the floors of buildings, including upper and lower beams joined by vertical upper column members and diagonal members, lower column members that support each upper column member on the floor, and screw jacks at the bottoms of the lower column members to permit fine height adjustments. The fact that each upper column member is separately supported by an adjustable device that assures proper vertical positioning, means that there are minimal bending stresses in the upper and lower beams during the heavy loading which occurs when supporting poured concrete, so that the structural members can be constructed of a material of high strength but low rigidity such as aluminum.

Abstract: A device for sealing the air hole in a concrete form while concrete is poured over the form, including a cap of resilient material having a dome-like top and a cruciform shaft extending from the concave side of the top for reception in the air hole of the form. When the dome is pressed down to form a dimple therein, the fact that the dimple remains indicates that the shaft is firmly seated in the air hole.

Abstract: Apparatus for forming concrete buildings that have numerous identical portions, which minimizes the set-up time for a group of forms, by permitting the forms to be individually released from set concrete while constantly maintaining the positions of the forms on a subform. The apparatus includes several forms with flanges that rest on a subform, several bolts for each form that project through flanges of the forms and through holes in the subform, and a spring for each bolt to urge its lower end downwardly with respect to the subform. After concrete is poured on the forms and partially sets, the subform is lowered a few inches even though the forms may remain stuck in the concrete, and then each form is individually freed from the concrete. As each form is freed, the bolts guide it down to its original position on the subform. The subform and forms then can be moved as a unit to a new location in the building where another identical concrete portion is to be formed.