Abstract: An unrolling device for cylindrical hay bales spikes the bale on its axis and pulls it along the ground to unroll it, when the device is pulled by a pickup truck, tractor, or the like. It comprises a transverse crossbar, two arms hinged at their ends to respective ends of the crossbar, and spikes insertable through the arm ends. The arms may swing out from the bar to a right angle; when both are swung out they lie parallel to one another. The spikes fit through the arm ends to protrude inwardly in the same plane as the plane formed by the crossbar and arms. Thus when set up for use the device has the general shape of a serif capital letter C. In use, the arms are set out on either side of a bale and the spikes are inserted through the arm ends to penetrate the hay bale on its axes. The device is pulled by chains on the crossbar to unroll the bale. When not in use, the device folds into a compact linear shape; the spikes are removed and the arms are folded down.

Abstract: A suspended ceiling electrical bracket for installation in a grid type suspended ceiling to provide a means for mounting one or more rectangular junction boxes (24) or mounting a single octagonal junction box (48), to which can be installed in such boxes, electrical devices such as electrical outlets, security cameras, emergency lighting, exit signs, and ceiling fans. The invention comprises of a flat rectangular shaped base (10) and upwardly bent lip (12) made of rigid sheet metal which replaces a portion of ceiling tile (28) and is adapted to overlap and mount flush against three adjoining grid elements (26), while allowing three u-shaped hooks (14, 16, and 18) to fit over and be secured to the vertical flanges of the respective grid elements (26). Holes (12A and 12B) are made in the lip (12) and top portion of two hooks (16 and 18), to allows the attachment of cable or chain to the building's structural members that reside above a suspended ceiling.

Abstract: The servo apparatus includes a series resistor string connected in parallel with the body of the servo slidewire resistor. Upscale and downscale travel limit voltage points, corresponding to upscale and downscale travel limit positions for the slidewire contact, are established along the resistor string. The limit voltages on the limit voltage points are separately compared with the slidewire contact voltage, and appropriate motor drive signal interrupting signals are produced when the slidewire contact voltage exceeds the upscale limit voltage or drops below the downscale limit voltage. The interrupting signals effect their motor drive signal interrupting action by reversing the output polarity of motor drive comparators which produce the motor drive signals under the control of an error amplifier which compares the apparatus input voltage to the slidewire contact voltage.