Abstract: A bolt tensioner has a cylinder and piston assembly whose piston is connected to a puller bar on which is mounted a socket formed with segments for connecting the puller bar to a bolt to be tensioned, and the inner surface of a sleeve reciprocable on said puller bar and the outer surfaces of said segments have coactive circumferential ridges and grooves with beveled sides to actuate and hold the segments into cooperative relation to the bolt and means to actuate the segments out of said cooperative relation upon movement of the sleeve into lower and upper positions, respectively. A reciprocable power operated apparatus connected to the upper end of the sleeve reciprocates the sleeve.

Abstract: Apparatus for manufacturing bolsters used to form the core for fabric windings includes apparatus to apply glue to specific areas of pre-sized cardboard cards, crimp the cards at specific locations to produce edges for the finished product, fold the crimped card, and compress the card to insure proper adhesion of the edges to the surfaces they contact, to form the finished bolster. The bolsters are produced by a method of passing a pre-sized cardboard card through the steps of gluing, crimping, folding and compressing, to provide a finished bolster of any predetermined length. A bolster is produced from a cardboard card of sufficient stiffness to provide for a substantially hollow construction, other than for a central stiffening spline used to determine the height of the bolster and provide rigidity to the bolster.

Abstract: A teaching machine utilizes a card having recorded on it visually readable statements of problems and corresponding machine readable answers. The teaching machine displays the answers to the problem on the card positioned for solution only if the student first enters the correct answer on the keyboard. The teaching machine also includes an interrogating device for counting the number of attempted solutions and the number of correct answers by the student, along with a device to display the contents of the counting device on the display.

Abstract: A hand-held teaching machine is used in conjunction with a card having recorded thereon columns of visually readable statements of a plurality of problems and corresponding columns of machine readable answers. The machine has viewing apertures for allowing a student to view individual problems presented on the record member in either an equation or algorithm format and an answer display positionally associated with the viewing apertures for displaying the answer entered on the machine keyboard. Means are included in the machine for allowing the digits of a multidigit answer to be entered either from right to left or left to right, and for causing the display to flash repeatedly if the entered answer is correct. Means are also provided for storing information identifying which of the attempted problems were answered incorrectly and retrieving the stored information in response to a predetermined interrogation signal. The machine also has means for allowing it to be used as a calculator.

Abstract: A friction roller for rotating twist tubes in twisting apparatus in which the friction ring is protected from contact with ambient oil by means of a protective coating and a slinger edge disposed on at least one side of the friction ring. The protective layer may be a protective ring which may be integral with the roller or it may be a protective layer of lacquer applied to the friction ring. The layer protects the friction ring from the spinning oil and the slinger edge acts to fling off by centrifugal force that oil which collects around the periphery of the friction roller so that the running surface of the friction ring remains unaffected.In one embodiment the slinger edge projects radially beyond the running surface of the friction ring and there is a peripheral groove on the associated twist tube which cooperates with the slinger edge in the manner of a labyrinth seal, which increases the protection against adverse influences from the spinning oil.

Abstract: A disposable container consisting of a tetrahedral-shaped chamber and a base member formed from a folded cardboard blank pre-coated with an adhesive layer and having folding guides at desired locations to provide the base with arms to hold the chamber. The chamber is formed from a segment of flexible plastic tubing, sealed at the bottom and sealed at the top on a line transverse to the sealing line at the bottom to form the tetrahedral-shaped chamber. The chamber is stably mounted on the base member, which provides a wide surface for supporting and protecting the tetrahedral chamber and also provides labeling surfaces for the container.

Abstract: A rotary tower crane has a tower constructed from uniformly sized sections which can be arranged to provide a tower of small or large cross section, as required. The tower sections can be aligned in a single, vertical column to provide a tower having a narrow cross section, or a plurality of sections can be joined horizontally to form sections of enlarged cross section, which are then vertically aligned to provide a tower having an enlarged cross section.