Abstract: An impact fastener especially adapted for holding batts of insulation to sheet metal is disclosed. A characterizing feature of the fastener resides in the provision of three stabilizing legs which are configured to engage the surface of the receiving metal after partial penetration and to deform in accordance with the depth of penetration, providing in all instances a stabilizing effect.

Abstract: An integral and inexpensive tying or bundling clamp device is disclosed, together with the method of applying the same. The clamp comprises a metal band having at one end an anchor defined by a series of convolutions of the band wrapped to provide a passage for the free end of the band. The device is applied by encircling an article and passing the free end through the passage and tightening the band while applying a reacting pressure against the convolutions, whereby the same are caused to constrict and frictionally to retain the band in the anchor.

Abstract: The present invention is directed to an apparatus for attaching welding pins to sheet metal, and particularly for attaching by a resistance welding procedure pins for retaining insulating material to a duct substrate. A characterizing feature of the invention resides in the provision of a fixed hopper member for receiving bulk quantities of weld pins and a carriage movable relative to the hopper for enabling the pins to be applied to the duct at spaced points, the combination including means for discharging a plurality of oriented pins from the bulk supply hopper to the movable carriage responsive to predetermined movement of the carriage.

Abstract: The present invention is directed to an improved integral sheet metal welding pin particularly adapted for use with automatic welding machines of the type in which pins are stored in random fashion in a hopper. The pin incorporates a shank adapted to be attached by resistance welding to sheet metal ducting, and includes an enlarged head spaced from the duct and adapted to press insulation against the duct. The improved pin is characterized by an elongated tongue portion struck from the head of the pin and lying in parallel spaced relation to the shank, the configuration of the tongue and its location being such as to prevent stacking or nesting of weld pins in a manner which would preclude their being separated for automatic feeding, the tongue also serving as a stop in the course of welding, to preclude over-melting of the shank or damaging of the insulation.