The invention relates to the welding of components made of heat-fusing plastic, using an electrical heating resistor arranged in the thickness of a connection component. According to the invention, the resistor is a thin electrically conductive layer advantageously formed on a supporting film made of heat-fusing plastic and capable of causing the tearing of the layer at a specific temperature corresponding to the welding temperature of the components. The invention is used particularly for the t...

A device to expedite removal of residual water-immiscible oil from a large tank through a manhole entry in the side of the tank, includes a trough which is inserted through the manhole and levelled, after which water fed into the tank floats the residual oil into the trough from which the oil discharges from the tank through the manhole for recovery or disposal.

Samples of inoxidizable heat insulating lining materials for aluminum electrolysis cells are tested after heating at high temperatures, some samples bare, some others packed in cryolite, whereupon the compression strength at room temperature, the apparent density and the dimensions are compared with the corresponding values of the untreated samples.

Apparatus for handling a fishing line having hooks spaced apart along it, such as is used in "long line" fishing, as the line is hauled in from the sea, comprises a rail-member, means for hauling the line in a direction at an angle to the rail-member and a guide-member which is engaged by successive hooks of the line as it is hauled, to guide the hooks into engagement with the rail-member, whereby the movement of the line at an angle to the rail-member causes the hooks to slide along the rail-me...

An improvement in redox-initiated emulsion polymerization of vinyl chloride comprising post-heating of the product emulsion in the presence of vinyl chloride monomer is disclosed, the post-heating providing under specified conditions improved heat stability of product resin.

A high-precision positioning table employs magnetic attraction to guide a table along at least one axis. Precision roller bearings between flat guide ways provide the support. A linear DC motor provides force for positioning along an axis without backlash. The linear motor also contributes attractive force aiding in the guidance or retention of the table. A vacuum lock secures the table in a selected position.

A gearshift indicator measures the slope of a surface being traveled by a multi-geared vehicle and indicates the gear which should be used appropriately for the surface. An adjustment varies the relationship between slope and indication to accommodate headwind and the strength and characteristic of the rider.

A knife having generally thin, relatively inexpensive and replaceable blades which can be extended from the handle when the knife is to be used and can be retracted when the knife is to be stored, the knife having a cavity in the handle for receiving a stack of the blades, a slide having a magnetic face for engaging and sliding the innermost blade into extended position and for retracting the blade into the handle and a lock for locking the blade extended.

A portable exerciser includes a rotatable platform on which a person desiring exercise can walk or run and adjustable height handholds which the person exercising can grasp to maintain balance. Auxiliary legs are provided permitting the surface of the exerciser to be tilted in simulation of a hill and an adjustable brake controls the amount of resistance to motion for varying the exercise content of the activity. The walking or running surface may be folded or rotated into alignment with the pos...

A quilting machine employs bobbin holders which support bobbins each having a conical lower portion ending in a point. A plurality of hooks are driven in an eliptical path to engage and pull down a loop of thread formed by insertion of a needle through a needle plate and the partial withdrawal thereof. The hooks keep the loop open and pull it down so that it passes over the pointed lower end of the bobbin. In order to facilitate engagement of the loop over the bobbin, the bobbins are maintained ...