Abstract: A sewing machine with a drive for a work clamp comprises two slides movable relative to each other, one carrying the work clamp and the other carrying two tail wheels and an endless belt trained thereabout. Two stepping motors which can selectively be run in the same or in opposite directions are engaged each with a respective one of the belt strands, so that with the motors running in opposite directions, the two slides move in the lengthwise direction, while with a run in the same directions, only the slide directly carrying the work clamp is moved, namely transversely. In another embodiment, the slide directly carrying the work clamp is non-rotatably connected to one of the tail wheels.

Abstract: A tested person blows into an alcohol-breath measuring device through the mouthpiece. The mouthpiece must be kept under hygienic conditions and must be disposable, thus designed for single use by a tested person. The mouthpiece is an integral part injection molded of polypropylene, having a mouth portion, and a portion connecting to the measuring device and extending through the bottom of the mouth portion into the interior thereof. The tested person takes the mouthpiece between his lips and exhales through the connecting portion into the device. A limiting flange on the outside of the mouth portion limits the penetration thereof in the mouth and keeps saliva from the surface intended for holding. The mouthpiece may accommodate a check valve. A valve insert received in the mouth portion holds a valve plate which under the blow, elastically disengages from apertures in the bottom of the insert and applies against these apertures again as soon as the blowing ceases or the tested person inhales.

Abstract: A hydraulic dashpot has a high pressure space and a low pressure space into which the hydraulic fluid is forced through a spring loaded and adjustable spill valve when the dashpot is acted upon by a blow to be damped. The low pressure space is divided up into two sections on the two sides of the high pressure space and axially in line with it. The spill valve is fixed in the cylinder of the dashpot rather than being mounted on or in the piston. There is a pipe joining the two sections of the low pressure space together and running through the high pressure space and through the spill valve. The check valve for letting the piston be returned into its starting position is formed by a ring on the piston.

Abstract: In a multi-coordinate measuring machine, a contact pin is movable relative to an upper part of a measuring head, in the X, Y and Z directions. The contact pin must be mounted so as to be displaceable from its zero position, and blockable in position in each of these directions. To simplify the construction, the mechanism for displacing and blocking the movements of the pin are combined in the form of an electrodynamic transducer for each of the three directions. The transducer is formed of a pair of aligned coils which are each associated with a permanent magnet.

Abstract: A device for extending flexible power supply lines for mining machines which are guided on a conveyor structure and moved back and forth along a longwall by means of a traction element which includes a coal strand and a return strand extending with an enclosed space comprising a housing secured to the conveyor and enclosing a load strand. A return and a cable channel is alongside the load strand channel, with the flexible supply lines being stored at the ends of the longwall towed along by a mining machine through the cable channel. The housing is secured to the conveyor structure and open at one side, and an idle roller is mounted in the housing in the cable channel. The supply lines are supported on the idle rollers. The mining machine is moved by a traction element and the supply lines bear against the traction element at the open side of the cable channel.

Abstract: A manufacturing method for a cushioning material of air-filled film, wherein a plastic film sheet formed into a cylindrical shape is transversely fusion-bonded so that small air-filled cells are fabricated continuously. Manufacturing equipment is provided with a means for forming a plastic film into a cylindrical shape, a longitudinal sealing means, a roller means, and a transverse sealing means.

Abstract: An air escape filter apparatus for emergency use by a person comprises a filter which is contained within a filter housing which is accommodated within a half mask portion of a breathing mask which is adapted to be engaged over the nose and mouth of a person. The half mask portion includes a sleeve portion having a guide ring which engages over the filter housing and is shiftable along the filter housing while remaining in holding engagement therewith. The filter housing is of a size so that it is retainable within the half mask portion in a standby condition at which time it is substantially coextensive in length with the half mask portion so that the two elements are accommodated within a very small space. The filter is extensible at the end of the sleeve portion to free the interior of the half mask for engagement over the wearer's face in a ready condition.

Abstract: A process for the preparation of alpha-(N-pyrrolyl)-derivative acids, the salts and esters thereof, of the formula ##STR1## in which R, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hydrogen atoms or substituted or unsubstituted alkyl, aryl, alkylaryl or heterocyclic radicals and R' is a metal cation, an organic base or an organic radical, wherein the corresponding amino ester is reacted with a dialkoxytetrahydrofuran or a derivative thereof. Certain compounds comprised among those corresponding to the above formula, particularly the DL, D and L-alpha-(N-pyrrolyl)-phenylacetic acids and certain esters thereof. Therapeutical compositions containing such compounds as active ingredient and therapeutical applications of said compounds.

Abstract: A bench has a driving unit on which abrading or polishing tools may be fixed. The unit is mounted on two cradles on the bench so that it may be rocked between an upright and a level position. The frame of the bench is made up of lengths of section and the bench top and the cradles may be slidingly moved thereon.

Abstract: A sewn pattern arrangement is produced by a zig zag sewing machine in a workpiece, within the range of a modular pattern length and width. Individual elementary patterns are sewn which are formed by several stitches and are preferably of the cross-stitch type and extend each only over a fraction of the modular pattern width. This makes it possible to sew elementary patterns at various locations within the provided range of widths, so that a variety of optically impressive designs may be produced by sewing pattern rows in a desired configuration. The respective final stitch of a pattern element forms the first stitch of the subsequent one, so that jump stitches between elementary patterns are avoided. Large-area patterns may be obtained by grouping rows of pattern elements side by side.

Abstract: A thread changing mechanism for sewing machines includes a magazine in which a plurality of needle holders is received, to be positively coupled to the sewing machine needle bar by a vertical motion of the magazine. Upon effecting a coupling, the magazine is retracted into a starting position remote from the needle bar, so that the needle bar with the needle holder can unobstructedly move during the sewing operation. The thread changing mechanism is mounted on a sewing machine as an attachment later, without particular adjustments. When the needle holders are held in the magazine the thread is engaged with each needle and held out of the way of the operating needle thread.

Abstract: A device for applying tension around an object such as a person's arm and leg comprises a tensioning member which has a first end portion which is connected to a rear end of a hollow basic member housing and includes a portion adapted to form an object encircling loop for engagement, for example around a person's arm and has a second opposite free end portion. The hollow basic member has a rear end wall with an entrance opening and a front end wall with an exit opening to facilitate passage of the free end portion of the tensioning member into the entrance opening through the hollow member and out the exit opening. The interior of the basic member includes a backup portion which has a backup surface over which the free end portion of the tensioning member is passed.

Abstract: A two-barrel revolver-type firearm comprising two fixed barrels to be fired alternately, which are equipped with igniting systems and drives of their own, independent of each other. A drum with an odd number of chambers alternately aligns a chamber with each barrel for alternate firing of cartridges through the two barrels.

Abstract: A mechanism for connecting two trough sections of a conveyor trough comprises connecting bolts which have heads on both sides and bridge the joints between the sections and are inserted in receivers which are provided in the section walls and are accessible from the inside of the upper trough portion. The bolt shanks have a rectangular cross section and are inserted through slots which are narrower than the broader side of the bolt shank. Upon inserting, the bolts are turned and arrested in transverse position relative to the insertion slot.

Abstract: An electric linear drive comprises a housing in which an external rotor electric motor is mounted. The motor has its stator fixedly mounted on said housing while on the other hand the rotor of the motor has a male screw thread thereon on which a bush is screwed. The bush is joined to a thrust rod and there are means for guiding the bush axially in the housing so that it may be moved into and out of the housing with a telescoping effect. This guiding means is furthermore designed for limiting the axial stroke of the thrust rod.

Abstract: A method characterized by entirely or partially coating a shaped material of synthetic resin or fibers with an adhesive having incorporated therein a thermally color-changeable particulate material which comprises three components enclosed or encapsulated in a high-molecular-weight compound, the three components being an electron donating chromogenic substance, an electron accepting substance corresponding to the chromogenic substance and a solvent having a boiling point of at least 150.degree. C. and selected from among alcohols, amides, esters and azomethines; and electrostatically flocking the adhesive layer with colored or colorless short fibers. The treated material is useful for making stuffed toys or dolls.

Abstract: A projectile particularly for use in rapid fire weapons and high performance guns comprises a hollow projectile body having an exterior surface with an annular groove therearound and with a plurality of openings formed in the groove at spaced circumferential locations. A rotating band is positioned in the groove and secured against displacement caused by centrifugal and accelerating forces, portions of the band which extend through the openings. The band is advantageously injection molded directly in the groove so that portions thereof form into the openings and extend through the openings and form a closed ring on the interior of the shell of the projectile body.