Abstract: A helium gas liquefying apparatus which has a compressor receiving helium gas stock, plural heat exchangers connected in series with each other via a series liquefying line, plural expansion engines connected in parallel with the corresponding heat exchangers, a Joule-Thompson's valve connected via the liquefying line, a series return line disposed in the reverse flow of the heat exchangers to the liquefying line, a three-way valve having one passage connected between the return line and the return valve and the other passage branched therefrom to the inlet of the compressor, and an additional line connected from the compressor to the three-way valve. Thus, high efficiency of Joule-Thompson's effect can be obtained.

Abstract: A linear ball bearing assembly including a bearing block body formed by forging or by precision casting and having a central recess of generally trapezoidal cross-section. Skirts are formed on opposite sides with respect to the central recess and integrally formed retaining side covers made of an oil-impregnated thermosetting material, die cast alloy or oil-impregnated sintered metal, being subject neigher to thrust load nor lifting load (upward load) are inserted into the bearing block body from the opposite sides of the bearing block and fixed thereto, and a race bar is incorporated into the linear bearing.

Abstract: A golf tee comprising a peg member having one end adapted to be thrust into the ground, a head member for placement of a golf ball and an elastic member provided between the peg member and the head member, and which is characterized in that an axial bore is formed in said head member, said elastic member is inserted in said bore and pressed by a pressure member, and one end of said pressure member is secured in said peg member, whereby the lower end surface of said head member and the upper end surface of said peg member abut against each other.

Abstract: A linear ball bearing unit having a track shaft extending through the unit. The unit essentially comprises a bearing body with a pair of symmetrically located ball rows with retainer-cover assemblies secured to the end faces of the bearing body and having in integral combination a retainer and a cover, an upper slide member and a pair of symmetrically located side slide members. The upper slide member and side slide members are disposed between the bearing body and the track shaft. The retainer-cover assemblies are made of plastic or non ferrous metallic material such as a diecast alloy.

Abstract: A door locking knob which has a knob body including an engaging hole perforated in non-circular cross section, and a rod for insertion into the hole and including cutout surfaces formed therealong and engaging portions at the ends for securely engaging the knob body upon turning of the knob. The knob body has a leg portion, and a pair of guide grooves formed axially on both side surfaces of the leg portion. When the rod is inserted into the engaging hole of the knob body and is turned at 90.degree. to engage the rod with the flat inside surfaces of the engaging hole of the knob body to securely implant the rod at the engaging portions into the side surfaces of the engaging holes of the knob body, so as to eliminate the necessity of internally cutting screw threads in the knob body, mounting of the door locking knob is simplified.

Abstract: An electronic typewriter comprising: a keyboard having a plurality of keys and generating an encoded signal in response to the depression of each key; a printing unit having a print wheel with a plurality of type elements disposed around the periphery thereof, a step motor for rotating the print wheel, a print hammer for impacting the type element brought to a printing position, an ink ribbon, and a ribbon drive mechanism for bringing the ink ribbon to the printing position; and an electronic control circuit for coupling the keyboard to the printing unit. The electronic control circuit controls the rotation of the step motor according to the encoded signal received from the keyboard so as to bring a type element selected by the encoded signal to the printing position within a short time for executing quicker printing, and further controls the action of both the print hammer and the ribbon drive mechanism in response to the rotation of the step motor.

Abstract: An electric dust collector is provided. A discharge unit consists of an array of a plurality of discharge electrodes each having a plurality of discharge styluses attached to each inner or outer side of a member of a light gauge steel for general structure to be parallel to a gas flow direction. An oppositely charged particle collecting unit consists of an array of a plurality of members of light gauge steel for general structure as dust collecting electrodes and is located downstream from the discharge unit in the gas flow direction. The discharge unit and the oppositely charged particle collecting unit are alternately arranged to constitute a discharge electrode side. A dust collecting unit consisting of an array of members of light gauge steel for general structure as dust collecting electrodes are arranged at predetermined intervals at each side of the discharge electrode side.

Abstract: A cryogenic impact testing method of Charpy's and falling weight types which can test a test piece without substantially exposing the test piece with the atmospheric air under the same test piece cooling space, temperature controlling space and impact testing space, and a cryogenic impact testing machine of Charpy's and falling weight types which can execute suitably the above method. Thus, the stable temperature of the test piece can be obtained at the time of testing with highly reliable measured result.

Abstract: An arrangement for forming a box-shaped covering body using a single flat covering metal sheet by placing the covering sheet over the top surface of the article being covered; pressing the covering flat sheet immovably on the article or product being covered by means of holding members; bending the left and right side portions of the flat covering sheet downward by means of lateral-portion bending members, thereby forming lateral cover portions on the left and right side wall faces of the product being covered; folding the front and rear ends of the lateral cover portions toward the front and rear end faces of the product being covered by means of corner folding members, thereby forming front and rear corner folds at respective corners of the product being covered; bending down the front and rear end portions of the flat covering sheet by means of end-portion bending members, thereby forming front and rear end-face cover portions in conformity with the contours of the front and rear end wall faces of the prod

Abstract: A toy vehicle for children featuring a mechanism whereby the movement of the vehicle by the motive force of a motor and the movement by the human force can be switched at will by a simple lever operation. When the power circuit to the motor is cut off by operating a switch lever, the gear adapted to transmit the motive force of the motor is disengaged from the follower gear secured to the axle.

Abstract: A new and unique roller bearing unit having a high load carrying capability is disclosed which essentially comprises a bearing unit body having a flat portion at the upper part and two projected portion at the lower part thereof with a considerably large groove formed therebetween, said flat portion having an upper non-loading roller groove and a lower loading roller groove and said projected portions having an outer non-loading stepped part and an inner loading stepped part, a track shaft adapted to be slidably fitted into said considerably large groove, an upper retainer firmly mounted on the flat portion for covering the nonloading rollers, side retainers firmly mounted on the projected portions for supporting the circulating rollers along the stepped parts, and a number of rollers adapted to circulate through the upper and lower roller grooves as well as along the outer and inner stepped parts.

Abstract: In a record player, the movement of the tone arm is controlled by a select plate operated by a lever which moves the plate to a position corresponding to a record size. Adjacent the select plate is a C-shaped lever which cooperates with a rotary member. The rotary member has a plurality of cams which serve to program the operation and various movements of the tone arm. Extending from the peripheral edge of one of said cams is a brush. The tone arm is also responsive to a bracket with a wall, said wall being engaged by the brush. A position detector plate is mounted on the bracket which cooperates with a photo-interrupter to detect the position of the tone arm with respect to a record being played.

Abstract: A trouble-shooting circuit arrangement for localizing and identifying the first failure in time in a sequence of failures which has a plurality of monitor circuits including trouble detector circuits for producing direct current outputs in response to the occurence of failure or trouble at various contact points and trouble localization circuits for identifying the trouble which has occurred in any of the monitor circuits, identifying such factors as coolant, pressure, temperature, fuel and the like in an engine. The arrangement locates the first failure or trouble in time, which has occurred in any of the circuits so as to remedy the countermeasures of the equipment against the occurence of trouble or failure therein.

Abstract: Oxyalkylene group of an alkylene oxide is inserted into a chain-type ether compound having at least one lower alkyl group by reacting the latter with the alkylene oxide in the presence of a catalyst prepared by mixing boron trifluoride and/or stannic chloride with an active-hydrogen compound exemplified by water or a lower aliphatic alcohol. The reaction results reduced formation of by-product dimer of the alkylene oxide even under an increased charging ratio of the alkylene oxide to the chain-type ether.

Abstract: An organic solution of a composition consisting essentially of 100 parts of an indium compound represented by the formulaIn(X).sub.l (Y).sub.mwherein X denotes a chelate ring formed by .beta.-diketones, esters of .beta.-ketoacids or the like, Y denotes an alkoxide formed by aliphatic alcohols or the like, and l and m denote an integer which is either 1 or 2 having the relationship of l+m=3, and from 5 to 20 parts of a tin compound represented by the formulaSn(X').sub.2 or Sn(Y')m'wherein X' denotes a chelate ring formed by .beta.-diketones or esters of .beta.-ketoacids, Y' denotes an alkoxide formed by aliphatic alcohols, and m' denotes 2 or 4, is suitable for deposition of transparent, hardened and low resistivity film coatings of tin-doped indium oxide on a substrate by dipcoating.

Abstract: An improved linear bearing unit is disclosed which has no reduction in operative performance irrespective of elimination of a conventional retainer. The bearing case of the linear bearing unit contains a plurality of non-loading ball holes and semi-circular deep track grooves whereby an increased contact surface is achieved between the loading balls and track grooves. The upper track grooves involve a right angle therebetween relative to the center of the bearing unit, causing no edge load (referred to as critical load at edge portion) to occur. Further, prestress (or preload) may be applied to loading balls in some of four track grooves.According to another aspect of the invention an outer sleeve is fitted into the bearing case, which contains four track grooves on the inner wall thereof.

Abstract: A process for the production of a mono- or poly-alkylene glycol diether which consists of reacting an ether having at least one lower alkyl group with alkylene oxide in the presence of a heteropoly acid or a heteropoly acid acidic salt. Heteropoly acids and their acidic salts whose ratio of the hetero and coordinate atom is 1:6 and 1:12 are preferably used.

Abstract: A new and unique bearing block for torque transmission is disclosed which comprises a bearing block body having two rectangular recesses at both the front and rear sides, said recesses extending at a right angle relative to one another and having plural substantially semi-circular ball rolling grooves on the inner wall of the recesses, a plurality of non-loading ball holes through the bearing block body, track shafts slidably inserted through the rectangular recesses with the corresponding ball rolling grooves provided on the side walls, retainers having plural slits, side covers with ball movement direction reversing U-shaped grooves and a number of balls adapted to circulate through the loading ball rolling grooves, the U-shaped grooves and the non-loading ball holes. As a typical practical application of the bearing block an improved Oldham coupling for torque transmission is disclosed according to another aspect of the present invention.

Abstract: A hose clamp which has an expanding portion of increased width at predetermined parts of a clamping portion is so formed as to produce a constant stress caused by the bending moment of forces and the axial force acting on the position where the maximum stress is applied to the clamping portion. The hose clamp has a first gripping end portion and a pair of second gripping end portions to expand the diameter of the clamping portion. Plastic deformation is prevented at the time of expanding the diameter of the clamping portion of the hose clamp.

Abstract: An improved linear ball bearing is disclosed which essentially comprises a bearing casing and a pair of retainer and side cover assemblies. The last mentioned assembly consists of a retainer half and a side cover and the two members are integrally secured to one another. On the inner end face of the side cover are formed U-shaped ball movement direction reversing grooves which are located corresponding to loading ball guiding grooves and non-loading ball guiding holes. The retainer half contains horizontal member, inclined members and lower holding members each of which is protruded from the inner end face of the side cover toward those of the opposite side cover. Between the adjacent concave end faces of these members are formed loading ball guides of which inner diameter is substantially same to the outer diameter of rolling balls and which are arranged so as not to cause any falling-down of the balls therefrom.