Abstract: An insert feed mechanism a feeder for feeding an insert, a folding assembly, a conveyor for transporting the insert from the feeder to the folding assembly, a sheet feeder for supplying the folding assembly with an envelope sheet. The conveyor directs the insert to strike the envelope sheet at a predetermined place on the envelope sheet where the first fold is to occur. The folding mechanism folds the envelope sheet around the insert to form a mailing envelope.

Abstract: In a plotter or other device for drawing inked lines on a receiving surface, an ink reservoir holding a large quantity of ink is provided to attain a long operational life for the associated pen. The reservoir includes a piston or other moveable working member to which air pressure is applied for pressurizing the ink, and the ink reservoir and associated pen are permanently connected with one another and with a few ancillary parts to provide a unit assembly readily connected to and disconnected from a pen head to permit quick exchange of units without danger of ink spillage. The ink reservoir is transparent or translucent to give the operator a visual indication of when the unit assembly is in need of replacement because of imminent ink exhaustion, and sensor may also be provided for automatically producing an electrical "out of ink" signal which appears upon the complete exhaustion of ink from the unit.

Abstract: A system of detaining a robber on the premises robbed after the robbery has taken place. The premises is provided with lobby entrances having inner and outer doors through which persons entering and leaving the premises must pass. Once a robbery commences, the doors to the lobbies are automatically locked. In the money handed to the robber, there is concealed a radio transmitter which transmits a narrow wave length signal. Mounted in the wall adjacent to each lobby inner door inside the premises proper there is mounted a receiver which is tuned to the narrow wave length and which has a limited range of reception on the order of about five feet or so. When the transmitter carried by the robber is within the receiving range of the receiver, the inner lobby door can be opened from inside the premises. Once the robber enters the lobby, neither of the lobby doors can be opened by the robber and he will be caught in the lobby.

Abstract: A resilient, axially slotted sleeve in the form of a split collar is removably mounted on the trailing threaded end portion of a fastener to be driven into hard material such as steel or concrete. The sleeve preferably includes compressible peripheral projections for temporarily retaining the fastener when loaded in the muzzle of a driving tool. Having aided in guiding the fastener during driving and protected its threads from deformation and/or clogging, the sleeve is thereafter strippable conveniently by radial peeling movement from the driven fastener to enable a nut or other threaded element to be secured thereto.

Abstract: A belt for holding a plurality of fasteners including a plurality of fastener receiving sleeves interconnected by webs. Each sleeve has a generally triangularly-shaped internal cross-sectional configuration. The corners of the internal triangle may be cut off to form flat surfaces. The fastener is engaged by the three sides of the triangle. The external surface of each adjacent sleeve has a planar portion positioned above and below the web which tapers away from said web. In addition, one end of each of the sleeves has a circular counter-bore therein and the other end has a groove therein extending parallel to the length of the belt. Each of the webs between adjacent sleeves has a V-shaped groove therein.

Abstract: A filing guide for a chain saw which defines a longitudinal slot therethrough for the chain and at least one transverse slot is defined through the guide and channel for a file to be used on the teeth. Legs of the guide defining the chain channel are unequal in length so that pressure exerted by the thumb or fingers will clamp the guide laterally to the saw bar while downward hand pressure on the teeth hold the teeth firmly in the bar guide.