Abstract: A drive rod string for a progressive cavity pump. The drive rod string includes a plurality of drive rods. Each drive rod has a pair of opposed ends, wherein each end terminates in a frustoconical pin having tapered threading and having a radially extending cylindrical shoulder. A plurality of connectors are provided to connect the drive rods. Each connector is attached to one of the ends of the drive rods, wherein each connector has a pair of opposed frustoconical threaded recesses which extend from a pair of opposed shoulders which mate with the cylindrical shoulders of the frustoconical pins. An internal secondary stop within said connector acts as a positive stop in each connector for the frustoconical pin.

Abstract: A drive rod has pins on each end of its body. Each pin has tapered threading and little or no undercut thereby enhancing its ability to transfer rotational motion through the drive rod string by increasing the surface area through which torque is transferred. The tapering of the threading on the pins allows for connectors having thicker walls. This means the connectors can withstand higher rotational stress. The drive rods and connectors are especially well suited for use with progressive pumps.

Abstract: A combined guide and automatic rod rotator device for a downhole sucker rod which is reciprocating axially. The sucker rod is connected with a swivel mechanism to allow rotational movement of the sucker rod. The combined guide and automatic rod rotator device includes a cylindrical body and at least two vanes extending radially from the cylindrical body, wherein the vanes are helically arranged on the body.

Abstract: This invention provides an improved power transmission belt which has a relatively thick rubber backing layer for improved interface with associated pulleys and improved wear resistance. The belt also has an aramid, glass, or other high modulus relatively inextensible cord secured by a layer of fabric.

Abstract: A low inductance electrolytic capacitor utilizes a stripline on which the capacitor section is wound in extended foil fashion. Each piece of the metal stripline has a projection spaced from one end. The pieces are assembled with an insulating strip between them with the projections at opposite ends and opposite sides of the stripline. The foil extensions are welded directly to the stripline and the stripline to the capacitor terminals.

Abstract: A traction device which is adapted to be mounted on a tire is provided which comprises at least one ribbed strap. The strap is mounted with the ribs facing outwardly, and provides greater traction in snow.

Abstract: An endless power transmission belt and method of making same is provided wherein such belt is made primarily of an elastomeric material and the belt is a flexible, cool running, stress-relieved belt, wherein these characteristics are imparted to the belt by cooperating components thereof including a continuous fabric layer which defines the inside surface of the belt and the fabric layer has a plurality of folded portions extending into the compression section of such belt at spaced positions along the endless path of the belt. Each of the folded portions has associated portions of fabric in contact at an associated interface and the interfaces serve as stress-relief slits for the belt with the associated portions of fabric serving as fabric cushions on opposite sides of an associated stress-relief slit.