Abstract: A set square has substantially the form of a 30.degree./60.degree./90.degree. triangle having therein an aperture having sides at 15.degree. and 45.degree. to each external side. The aperture may be in the form of a 30.degree./30.degree./120.degree. triangle disposed with its longest side closest to the hypotenuse of the 30.degree./60.degree./90.degree. triangle and at an angle of 15.degree. thereto, said side diverging from the hypotenuse towards the 30.degree. vertex of the 30.degree./60.degree./90.degree. triangle; preferably a line is indicated perpendicular to one of the external sides other than the hypotenuse, the line being indicated adjacent said side and extending across said aperture, and being indicated on either side thereof. There may be a protractor scale whose origin is at the intersection of the line and the perpendicular side.

Abstract: A method of operating a particle-treating apparatus having a hollow foraminous drum centered on and rotatable about an upright axis comprises the steps of feeding particles into the upper portion of the interior of the drum, rotating the drum about the axis at a speed sufficient to form the particles into an annular body lying on the inner surface of the drum, passing a drying gas radially inward through the drum into the interior thereof and withdrawing the gas axially from the interior to at least partially fluidize the body and dry the particles, and collecting the particles beneath the drum as the body moves off the lower edge thereof. The rate of gas flow through the drum and the rotation rate of the drum are such that the body moves axially down in the interior toward the lower edge of the drum.

Abstract: The description is of a method for drying vehicles in washing establishments in which after the washing or clear rinsing step and before the drying step water containing a wetting agent is applied to produce a substantially uniform thin water film on the vehicle, wherein the drying is achieved through infrared ray generators or by means of other heat ray generators, and the moist air is withdrawn. An apparatus for carrying out this method is also described. The thin water film guarantees a rapid evaporation of the water from the outer surface of the vehicle with reasonable energy consumption and at the same time serves as an overheating protective device for the vehicle surface.

Abstract: A method of continuous drying of a paper or other porous web by passing the web (3) by means of a drying felt or wire (4) between two moving, air-impermeable surface elements (1, 8) having good heat conducting properties, which elements enclose the web along its whole width. The surface element (1) contacting the web is heated and the surface element (8) contacting the wire is cooled for evaporating water present in the web and condensing the evaporated water into the felt or wire. The temperature of the liquid used for cooling the surface element to be cooled is maintained above 100.degree. C. and the pressure at least at such a level as to prevent the liquid from boiling. Thus, the drying of the web can be carried out at an elevated temperature and under an elevated pressure in a continuous process at production conditions for improving the web characteristics.Preferably the cooling liquid is maintained at different temperatures and/or under different pressures at separate steps of the cooling process.

Abstract: A dehydration apparatus for separating water deposited on articles charged in a dehydrating vessel by centrifugal force resulting from rotation, in which the bottom plate of said dehydrating vessel is constructed so as to be openable such that the articles in the dehydrating vessel are caused to drop down by opening said bottom plate and can be easily taken out.

Abstract: An inflatable structure, includes a base and a barrier attached to the base which is capable of being inflated to a predetermined shape in order to define a chamber. A door in the barrier allows access to the chamber. The base includes a source of gas for inflating the barrier and for circulating within the chamber. The barrier is constructed as a twin-walled structure having inner and outer walls defining an air flow space therebetween. Holes are provided through at least portions of the inner wall to provide a means for circulation of air from the space into the chamber. When not in use, the aerator may be deflated and folded for compact storage and shipment.

Abstract: A gaitor (10) has an upper fabric portion (12) configured to be wrapped around a leg of a wearer. The fabric portion (12) has a zipper (40) for fastening the portion (12) around the leg. The fabric portion (12) has a lower edge (26). A rubber gasket (14) configured to conform closely to a shoe (16) worn by the wearer has an upper rim (24). The gasket (14) is fastened by means of a seam (28) around the lower edge (26) of the fabric portion (12). The lower edge (26) of the fabric portion (12) is folded up to lie against the upper rim (24) of the gasket (14). The seam (28) fastens the folded up lower edge (26) against the upper rim (24) of the gasket (14). A structural tape (60) formed from a nylon sheet die cut into a strip with alternating wide and narrower portions (64 and 66) is fastened along seam (28) at toe (54) of the gaitor to prevent folding of the rubber gasket (14), which is otherwise prone to occur at the toe (54), resulting in tearing of the seam (28) when stressed.

Abstract: A laminate is formed by needling a layer of hydrophobic fibers through a middle odor-absorbing layer into a bottom layer of closed-cell foamed thermoplastic. The laminate may be thermoformed to produce articles having a surface shape conforming to the contours of a region of the human body such as resilient supportive innersoles, soft casts or splints, and impact-absorbing pads. Such articles, in addition to their usual function, absorb odors significantly and wick perspiration away from the skin. Innersoles made from the laminates resist delamination and disintegration even when used in athletic footwear.

Abstract: This device is a driver's heel protector, including a flexible shield for placement against a rear end of a shoe, and straps attached to the shield for securement to a lower portion of the shoe and also around a wearer's ankle.

Abstract: A spring-type shank for a shoe sole is formed on the bottom of a shoe assembly during manufacture of the shoe. The heel end of the shank is formed so that it is raised slightly from the heel seat region of the insole to provide a "spring shank". The shank is formed directly on the bottom of the shoe insole from a strip of initially flexible, uncured thermosetting material which may be fiber reinforced. The spring portion at the heel end of the shank is formed by placing a wedge between the shoe insole and the heel end of the shank strip during the curing process thereby to cause the heel end of the shank strip to cure in a raised, inclined attitude, spaced from the bottom of the insole, while the more forward, remaining portions of the shank strip cure in secure attachment to the insole bottom.

Abstract: A shoe with interchangeble shoe straps having spring connectors is provided. The spring connectors are affixed to opposite ends of each strap employed with the shoe. Each spring connector includes at least one loop spring which engages a stud securely affixed in the lower portion of the shoe. The spring connectors and straps can be easily interchanged but are not subject to unintentional disengagement. The spring connectors also provide a desirable amount of resiliency adding to the comfort of the shoe.

Abstract: A ski boot consists of a foot portion and a leg portion connected in articulated relationship. A stiffening element at the front of the boot formed of resilient material has substantially the profile of the boot and is attached at least partially to the foot portion and/or the leg portion thereof.

Abstract: A conventional ski boot is provided with a walking attachment configured as a removable, curved sole arranged with toe and heel straps configured to be clipped over the front and rear ledges of the boot, the deepest portion of the curved sole being located under the ball of the foot for allowing the foot to rock rearward, thus enabling the leg to be straightened at the knee for normal walking.

Abstract: A single-piece transparency frame for holding a film therein comprising: a window-shaped opening, the width and length of which on the front face are greater than the useful length and width of the film to be inserted, and on the rear face are less than that length and width; two horizontal grooves provided in the plane of the film in the lengthwise direction of the film; two narrow sides located on the front face of the opening which are extended by parallel slots which in turn open into said horizontal grooves.

Abstract: A dynamic display comprising a multiplicity of presentation units such as solid blocks (as shown), containers, stands or shelves arranged for rotation as at least two groups about respective parallel axes. At least one of the groups being contra rotatable with respect to the or at least one of the adjacent groups, and each of the presentation units being shaped and located to avoid interference with any of the other presentation units, with the groups being arranged in a straight line (as shown), cyclically or in a pattern, even though the paths of movement of the presentation units of adjacent ones of the groups overlap, when viewed in a direction parallel to said axes.

Abstract: A menu board is provided which utilizes members carrying interchangeable numbers, letters or other characters, and possesses special features which render the menu board highly legible. The menu board is provided with window-like openings and means for replaceably mounting the interchangeable character members behind the board openings. The character members include appendages selectively engageable with end stops provided on the board, or with slots provided on the board for positioning and locking the members in place. In one embodiment, the characters are each of a selected length and are overlaid one upon the other within the board openings, but so that the characters themselves are not overlain as viewed from the front of the menu board. Alignment means is provided for controlling the registration of the characters with respect to one another within the windows, and locking means is provided for securing each group of character members in place.

Abstract: Revolvers are used by a wide segment of the population and it is difficult to supervise the use of these firearms unless they are kept under lock and key in a cabinet. The present invention enables the owner of a revolver to disable operation of the cylinder of the revolver by inserting the safety locking unit of this invention. When inserted, the safety locking unit cannot be removed by unauthorized persons since removal requires a key. The presence of the safety locking unit does not affect the normal handling of the revolver such as holstering of its inherent safety features.

Abstract: A muzzle loading firearm has a barrel bore into one end of which is force fitted a breech plug. The barrel wall has a radial aperture through one side and a diamaterally opposed recess in its inner surface, and the breech plug has a diamaterally extending passage aligned with the aperture and recess in the barrel wall. In one embodiment, a bolster is force fit into the barrel aperture, breech plug passage and barrel recess. The breech plug has a bore in its inner end communicating with the passage therein, and the bolster has a flash chamber and passage aligned with the breech plug bore.

Abstract: A firearm of the type utilizing a pivoting hammer which either carries or does not carry a firing pin is disclosed herein along with a specific safety latch for use therewith. The safety latch is carried in its entirety by the hammer behind its thumb spur and is movable in a direction perpendicular to the pivotal movement of the hammer between a first safe position and a second firing position. With the latching member in its safe position, it cooperates with the main frame of the firearm for preventing the hammer from any movement. With the latch member in its firing position, the hammer is made free.

Abstract: A revolver has a trigger safety interlock blocking the trigger in an initial position if none of the circumferentially chambers of a cylinder are axially aligned with the revolver bore. This interlock consisting of at least two elements one of which is the trigger itself and the second one is a cylinder latch itself. This interlock is built such that the trigger is engaged by another part of the interlock such that the trigger becomes immovable.

Abstract: 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-member so as to separate them from the line and feed them towards a storage rail.

Abstract: An automatic fishhook setting apparatus includes a base which is detachably mounted on an anchor post with freedom of side-to-side pivotal movement. A fishing rod support member is hingedly connected to the base for pivotal movement between a set position wherein a fishing rod is supported in forwardly extended relation and a release position wherein the rod is moved to an upright position. The rod support member is biased toward its release position but may be releasably latched in the set position by an elongated upright trigger pivotally connected to the base and having a latching surface engageable with the rod support member. A portion of the fishing line adjacent the reel is trained rearwardly around the upper end of the trigger so that strikes on the line by a fish pivot the trigger forwardly causing the fishing rod and rod support member to be pivoted upwardly to securely set the hook in a fish's mouth.

Abstract: A fishing float, or "bobber", is disclosed having a hollow buoyant body member which is at least partially transparent, and containing an electric lamp bulb, an electric battery and a resiliently operable electric switch connected in series with the bulb, the body member carrying a line lock adapted to be secured to an intermediate point of a fishing line so that a leader portion of the line depends from the body for attachment of a fishhook, bait, lure, sinker or the like to the lower end thereof. Tension on the leader is operable to close the switch against a tension spring to actuate the bulb. The float body has a chamber to which water may be added to vary the buoyancy of the float, and the switch spring is adjustable to vary the sensitivity of the switch.

Abstract: A fishing float is described having the unique capability of maintaining its position in a moving stream, thereby allowing the fisherman to place his lure in a given spot in a stream and in a repetitive manner. The float consists of a disc having a fin on one side and a fin on the opposite side that is orthogonal with respect to the first fin. Fish attaching points are located on the periphery of the disc and are each located approximately 45 degrees from each fin. Attaching a fishing line to a preferred attaching point is determined only by the direction of the stream relative to the fisherman.

Abstract: A connecting member comprising an elastically deformable, tubular plug (1) slitted at the ends for interconnecting pairs of building components (9a,9b), which have coupling holes (8a,8b) to receive the ends of the connecting member, has apertures (3) in the plug wall between the slits (2), and the plug wall is formed with lengthwise extending clamping wedges (4) between the apertures (3), said clamping wedges having inclined faces which slope towards the ends of the connecting member and causing the connecting member to be compressed at the center and be expanded at the ends when it is pressed into a pair of co-axial holes in adjacent building components. The connecting member may in particular be formed with an annular flange (5) and end beads (6a,6b) which fit in corresponding annular grooves (7) in a pair of adjacent components (9a,9b).

Abstract: A toy grenade utilizes a self-powered camera flashcube in which one of the flash bulbs is activated upon an impact of the grenade with a surface after being thrown. The grenade includes fins at one end and a weight at the other end for providing a stabilized flight with the weight being rubber or the like and is designed for impact with the ground or other surface. Supporting the weight is a flexible resilient member, such as a wire, which is fixably connected to the body of the grenade. An actuating member extends from the weight through a hole in the grenade body so that it will enter one of the peripheral slots on the flashcube so that upon impact of the grenade on a surface, the actuating member moves into contact with a peripheral contact on the flashcube so as to activate the associated bulb in the flashcube in exactly the same manner that the bulbs in the flashcube are activated when mounted on a camera.

Abstract: A flower arranging vase for displaying flower blossoms individually apart from each other, and around a side of the vase; the vase including a vessel perforated with holes through an upper portion of its side wall, so that flower stems can extend therethrough.

Abstract: There is disclosed in the present application a foldable picture window storm window. It consists of a frame whose lower and upper sections are made to swivel such that the storm window can be folded, easily transported and stored; yet, does not adversely affect the view.

Abstract: A door for selectively covering an opening in a wall has at least one primary door panel movable to substantially cover the wall opening. The door panel has a rear surface facing the wall, an opposing front surface and a pass opening to permit passage therethrough. A frame borders the pass opening and includes a lock jamb having an offset door stop and a complimentary hinge jamb. A pass door for substantially covering the pass opening has a rear surface, a front surface, a first side edge and a second side edge. The first side edge of the pass door is hinged to the hinge jamb to permit the pass door to swing between an open position and a closed position against the offset door stop of the lock jamb. A pin for limiting lateral movement of the second side edge of the closed pass door relative to the lock jamb, has a proximal portion fixed to the offset door stop and a distal portion substantially perpendicular to the offset door stop for engaging the pass door when the pass door is in its closed position.

Abstract: To permit cutting of rotatable machine tools, or sharpening of cutting edges therefrom, for example boring tools, drills, milling cutters and the like, a grinding head has positioned thereon two spindles which carry at least three grinding wheels; one of the spindles (41) carries two grinding wheels (43, 44) and is rotatable about a horizontal axis of rotation (42). The other spindle (37) carries a grinding wheel (35) and may carry a second one at the other end (35a) and is positioned for rotation in an essentially vertical plane. The spindles can be tilted out of position in their normal rest planes by program-controlled (47) motors, such as stepping motors or servo motors. The workpiece tool (13, 50) is held in a tool carrier (7) which is rotatable with respect to the grinding head, and movable with respect thereto by cross slide positioning means (4, 5; 2, 19).

Abstract: A finishing machine comprising a generally annular finishing chamber having a bottom and upstanding side walls, centrally located vibratory means comprising a substantially vertical shaft with major and minor eccentric weights at each end thereof, one of the eccentric weights at each end of the shaft being fixed, the other of the eccentric weights at each end of the shaft being moveable with respect to said shaft, means operatively associated with said moveable eccentric weights for effecting movement thereof within permissible limits, and limit means defining the permissible movement of the moveable eccentric weight at each end of the shaft, for respectively (a) increasing or decreasing the intensity of vibrations, or (b) reversing the direction of the force factor and hence the direction of flow of mass within the finishing chamber concurrently with an increase or decrease in the intensity of vibrations, depending upon whether the moveable eccentric weights are (a) two minor eccentric weights or two major e

Abstract: A long-travel annular vibratory barrel finishing apparatus for line-processing having an annular vibratory barrel constituted by at least one barrel line having opposing end barrel segments having a semicircular shape in plan and two straight barrel sections connected between opposing end barrel segments, such that the longer diameter (length) of said annular barrel is much greater than the shorter diameter (breadth) of the same. The annular vibratory barrel as a whole is mounted on a base through a plurality of springs for free vibration which is caused by a vibrator disposed at the center of the longitudinal axis of the annular vibratory barrel. As the vibrator is started, the annular vibratory barrel is vibrated to cause a spiral flow of mass therein.

Abstract: A vertical wing skin sanding machine which includes one or more sanding stations, dust/sound enclosure, operator console, and dust collectors all mounted on a common trolley designed to travel a linear path over the required length. The system provides an opening bisecting the device to allow for finishing the stationary part on both sides of the part. The system provides a mechanical means of propulsion of the device and guide rolls to stabilize, sound damp, and direct the part by the finishing wheel.

Abstract: A control circuit contains, instead of the otherwise conventional feeler or scanner contact, a displacement pick-up or displacement path transmitter which delivers pulsating signals representative of the irregularities of the scanned grinding wheel. The effective value of such pulsating signals, measured over a scanning or feeling interval, is dependent upon the wear of the grinding wheel or constitutes a measure of the compensating adjustments or repositioning displacements of the grinding wheel. The evaluation of the output signals of the displacement path transmitter or pick-up delivers data concerning the properties of the surface of the grinding wheel, the time during which there is to be undertaken a compensation feed of the grinding wheel, the frequency of the compensating feed and the degree of the compensating or adjustment feeds of the grinding wheel, and specifically, for the positional readjustment and dressing of the grinding wheel both in axial and also in radial direction.

Abstract: A process for preparing the interior of a corrugated pipe or sheath comprises the steps of placing a predetermined amount of a tumbling abrasive material into the sheath, and then rotating the sheath.

Abstract: An abrading tool having, in one embodiment (280), at least one abrasive member (20) carried by a rotatable disc (285). A flexible elastomeric biasing spring (290) imparts a force upon the abrasive member (20) to urge the abrasive member (20) to a position which is substantially perpendicular to the disc (285). An adjuster (295) modifies the biasing force by changing the position at which a transverse bar (340) abuttingly contacts the biasing spring (290). The adjuster (295) eliminates the necessity of changing the rotational speed of the disc (285), abrasive characteristics of the abrasive member (20) or feed rate of the tool (280) in order to modify the sanding performance characteristics of the tool (280).

Abstract: An improved construction and method of assembly for applying vinyl soffit and fascia panels to a cornice of a structure precludes the usual time-consuming process of installing the soffit panels one at a time by sliding them through supporting channel or by flexing the panels. The construction includes an improved corner member having outer and lower legs which is fitted adjacent to the bottom of the fascia of the cornice. The corner member includes a lock leg depending from one of the outer and lower legs, and is adapted to engage outer edge portions of the soffit panels and a lower edge portion of the fascia panel whereby the installation of the soffit panels may be accomplished in an efficient and straightforward fashion.

Abstract: The invention relates to a method for reducing the heat consumption in a building or the like. This is brought about by the fact that the air movement caused by free winds close to the external surfaces of the building or the like is reduced by means of air permeable screens which are applied close to the external surfaces of the building or the like. They may also be applied close to external surfaces of other adjacent buildings or the like. The screens are disposed substantially transversely to the dominant direction of the free winds along the last-mentioned surfaces.The invention also relates to means for carrying out the method, consisting of one or more air permeable wind screens which are fitted to the building or the like.

Abstract: A concrete bond beam is employed in building constructions using concrete slabs having hollow core channels therein serving as vertical walls. The bond beam includes at least one opening therein and a pair of downwardly extending flanges. The bond beam is mounted on top of each slab with the top edges of the slabs being received between the flanges of the bond beam so that the opening therein is aligned with a selected core channel in the slab. Reinforcement rods extend both horizontally within the confines of the bond beam and vertically through the cores in the wall slabs and the openings in the bond beam. Structural concrete columns are formed in the wall slab cores surrounding the vertical reinforcement rods. The building thus contains a matrix of structural reinforced concrete beams running both horizontally and vertically throughout the construction.

Abstract: An assembly or panels of rectangular shape, as for example, a floor, in which the panels comprise upper and lower rigid sheets separated by a core, elongated fittings extending along adjacent edges of adjacent panels and having lateral extensions received between edge portions of the sheets of the panels. Each fitting has an upwardly open channel located beyond the edge of the associated panel. Adjacent fittings, and hence adjacent panels are secured together by elongated connector strips which have parallel elongated lugs received in the channels of the adjacent fittings.

Abstract: A sub-structure for boat docks consisting of an elongated, ladder-like frame having a pair of side bars connected by a series of cross bars extending between and connected at their ends to the side bars, the side bars and cross bars being of such cross-sectional configuration, and the connections therebetween being of such a nature, that the frame may yield in a vertical direction with relatively great resilient flexibility, whereby to accomodate wave action in the water therebeneath, while at the same time being relatively highly resistant to deformation in its own plane for maintaining its horizontal form and shape. Generally, the side and cross bars are of such configuration as to strongly resist bending stresses, but to permit torsional yielding with relative ease, and the cross bars are connected to the side bars to permit a degree of universal pivotal movement therebetween.

Abstract: A structural building unit comprising a bar-shaped member having a central section and two edge sections with first connecting means projecting from the central section and second connecting means in each edge section. With a connecting member and/or connecting plates, one or more of the bar-shaped members are used to construct various structural modules.

Abstract: An elongated beam is constructed from a sheet metal panel and has upper and lower flange sections integrally connected by a web section. The web section has upper and lower inclined web portions which project in opposite directions from a vertical intermediate web portion and cooperate to provide the beam with a generally Z-shaped cross-sectional configuration to facilitate stacking of a plurality of beams in interfitting nested relation. The upper and lower flange sections are stiffened by members which may be longitudinally extending sheet metal strips or longitudinally spaced stiffening elements, and the upper and lower flange sections and adjacent portions of the web section are formed slightly different in size to permit interfitting of mating overlapping end portions of two longitudinally aligned beams after one beam is inverted relative to the other.

Abstract: An apparatus for supporting an edge-finishing strip along an edge of a partition-forming sheet of wallboard. A plurality of clips grip the wallboard along the edge in spaced relation to each other, the clips being supported on the wallboard without fasteners. An elongated finishing strip has a trim member for obscuring the edge and a flange insertable between the clips and the wallboards for supporting the trim member in obscuring relation to the edge. The clips may be provided with additional portions engageable with the finishing strip to enhance the support of the trim along the edge.

Abstract: For enveloping a composite group of items in a stretchable film, a pair of initially spaced wrapping cage assemblies are moved inwardly toward each other so as to form a wrapping cage for supporting the composite group of items to be wrapped and for capturing a part of an elongated stretchable film between parts of the wrapping cage and of the composite group of items, rotating the wrapping cage assemblies so as to cause the stretchable film to envelop the composite group of items, withdrawing the wrapping cage assemblies outwardly so as to disengage the film and the composite group of items about which the stretchable film is wrapped and finally severing the stretchable film.

Abstract: A corrugated container and the method of forming the container saves paper. The method of forming the container includes gluing backing webs of paper to each side of a corrugated web, resulting in a composite web of three layer thickness. One of the backing layers is wider than the other backing layers, defining single layer strips on each edge of the multiple layer central section. Longitudinal fold lines are placed in the multiple and single layer strips. The composite web is sheared into sheets, with the sheet being folded along the fold lines into a container. The fold lines are placed to position the single layer portions on the upper sidewalls and top of the container, where less strength is required.

Abstract: The subject invention is a lawn mower blade hub member adapted for interconnecting a plurality of flexible blades, all affixed and disposed in a radial fashion from the centrally disposed hub member, which hub member is then mounted for concentric rotation on the lawn mower engine drive shaft; and wherein each such blade mounted to the hub member is comprised of a flexible, non-rigid, material. The hub member is a circular, plate-like member which has a plurality of insert openings which are adapted to receive and securely hold the radially inner ends of the respective flexible blade members. Disposed laterally adjacent to and just radially outwardly of the respective insert openings are vertically extending bosses, which bosses are disposed between the respective insert openings, thereby forming between adjacent bosses a channel area to securely hold a portion of the radially inner end of the flexible blade member in a radially outwardly rigid position.

Abstract: A stalk shredder is mounted upon a cotton stripper, below and immediately behind the cotton stripper. Therefore, the shredder is raised and lowered with the stripper elements and also is in a compact position in relation to the total vehicle. A scythe-shape cutting blade is used.

Abstract: A spindle moistener assembly for a cotton picker which assembly includes a plurality moistener members mounted in cantilever fashion to an elongated support with each moistener member including a mounting arm at one end secured to the support and a moistener pad at the opposite end disposed to be engaged by the picker spindles for moistening same during the rotation of the picker drum. Each moistener member is constituted of a unitary body of resilient material integrally formed at one end with the mounting arm and at the opposite end with the moistener pad.

Abstract: An insert (3) is arranged in the interior space (10) of a housing (1) of an opening device for an open-end spinning apparatus. The insert (3) is of pot-like construction with a recess (35) provided in the base (34). The recess (35) exposes a bearing bore (18) through which a drive shaft extends for supporting the opening roller. A fixing device (41, 42) is likewise associated with the insert (3) securing its relative position to the housing. A guide element (5) introducible into the insert (3) is provided to guide the insert (3) during introduction into the housing (1) or during its removal. This has a contour corresponding to the interior space (10) of the housing (1) and one or more positioning lugs (50) on its end face opposite the base (34), corresponding to the number of the positioning cavities provided in the insert (3).