Abstract: The invention relates to a method for assembling sheets by riveting, comprising a step for piercing a hole through the sheets, followed by a step for placing a rivet in the pierced hole, the step for piercing a hole being executed by supplying an advance speed instruction of a piercing tool as well as a rotation speed instruction of this tool. According to the invention, a previous step for determining information on the local stiffness of the sheets (Info_stiffness) is also carried out at the level of the hole to be pierced, the advance speed instruction and rotation speed instruction of the tool being a function of this information on the local stiffness of the sheets. Application most suited to the field of aircraft construction.

Abstract: The present invention includes a step of cooling a molten metal within a fine space present in the inside of an object and hardening it while applying a forced external force exceeding atmospheric pressure to the molten metal. The fine space is opened on the outer surface of the object in terms of one end thereof. The forced external force is given by at least one member selected among a pressing pressure, an injection pressure and a rolling compaction and applied to the molten metal from the opening surface side on which the fine space is opened, in a state that the other end side of the fine space is closed.

Abstract: A method for shielding discarded or unwanted items provided with a Radio Frequency Identification (RFID) tag, comprises the following steps. First, a facility containing an inventory including a plurality of products each including a radio frequency identification (RFID) tag is provided. Then, the facility is provided with an RFID waste collection container defining a magnetic shielding enclosure for shielding and electromagnetically isolating the RFID tags when the products are disposed therein. Next, it is determined if one of the plurality of products is not wanted. Subsequently, the unwanted product is discarded by placing the unwanted product into the RFID waste collection container so that the RFID tag of the unwanted product does not interfere with ongoing activities in the facility by emitting errant signals.

Abstract: The invention relates to a method for producing the rotor winding of an electric machine comprising at least four exciter poles in the stator and a commutator rotor with a number of pole teeth which deviates from the number of exciter poles as well as a number of individual tooth coils and commutator segments that is at least twice as large as the number of pole teeth. In order to obtain low torque ripple and a long service life by optimally commutating the coils, a first coil is wound from an initial segment at a selectable offset angle to the initial segment on a first pole tooth, the winding wire is then fixed to another commutator segment at a predefined segment interstice length, whereupon a coil is successively wound from each segment onto the pole tooth having the lowest angular error relative the offset angle in relation to the pole separation of the stator, and the winding wire is then contacted on another segment at the same segment interstice length.

Abstract: A method is provided that utilizes silicon through via technology, to build a Toroid into the chip with the addition of a layer of magnetic material such as Nickel above and below the T-coil stacked multi-ring structure. This allows the connection between the inner via and an array of outer vias. This material is added on a BEOL metal layer or as an external coating on the finished silicon. Depending on the configuration and material used for the via, the inductance will increase approximately two orders of magnitude (e.g., by utilizing a nickel via core). Moreover, a ferrite material with proper thermal conduction properties is used in one embodiment.

Abstract: A method for providing a perpendicular magnetic recording (PMR) transducer is described. The PMR transducer provided includes a PMR pole and yoke structure coupled with the PMR pole. The method includes providing a hard mask and an intermediate layer. A first portion of the hard mask resides on the PMR pole. A second portion of the hard mask resides on another structure. The intermediate layer surrounds at least the PMR pole. The method also includes performing a planarization on at least the intermediate layer, removing the first portion of the hard mask on the PMR pole without completely removing the second portion of the hard mask on the other structure. The method further includes removing a remaining portion of the hard mask on the other structure, providing a write gap on the PMR pole, and providing a shield on the write gap.

Abstract: A monolithic, multi-layer heating element forms the high temperature tip of a glow plug assembly. The heating element includes a conductive core which is surrounded by an insulator layer, which in turn supports a resistive layer. An optional conductive jacket can surround the resistive layer. These layered components are pre-formed in prior operations and then assembled one into the other to form a precursor structure. The precursor structure is transferred to a die, where it is compressed to form a so-called green part having dimensional attributes proportional to the finished heating element. The individual layers remain substantially intact, with some boundary layer mixing possible to enhance material-to-material bonding. The green part is sintered to bond to various materials together into an essentially solid mass. Various finishing operations may be required, following which the heating element is assembled to form a glow plug.

Abstract: An electronic component is mounted on a printed board by a first head and a second head collaboratively. The first head is prioritized to the second head for moving operations. The range which allows the second head to move is defined in consideration with all the positions where the electronic components held by the first head are to be mounted on the printed board such that no collision occurs between the first head in operation and the second head.

Abstract: In a mounting apparatus for electronic components, a command from a host computer is transmitted to a linear motor M via a motion controller and a servo amplifier to thereby drive a mounting head H1 or a mounting head H2. To prevent collision between the two mounting heads H1, H2, position information from a linear encoder E is fed back to not only the servo amplifier, but also the motion controller. Once determining that the two mounting heads H1, H2 collide, the motion controller applies brake to the mounting heads H1, H2 to avoid collision therebetween, regardless of the command from the host computer.

Abstract: A method for producing an electro-thermal separation type light emitting diode support structure is provided. One of the embodiments for the support structure has at least two heat dissipation bases and at least two conductive supports which are coupled by a heat dissipation plate and a support plate. Another embodiment for the support structure has at least two heat dissipation bases and at least two conductive supports which are formed by a thick-thin plate. The light emitting diode chips of different types can be configured on the heat dissipation bases of these designs, respectively. Therefore, the invention achieves the goal of using different types of light emitting diode chips at the same time.

Abstract: In a component mounter of so-called alternate mounting, a component mounting condition determining method of determining a component mounting condition that equalizes operating times of a plurality of mounting heads is used. The component mounting condition determining method includes determining a component mounting condition such as to approximately equalize the operating times of the mounting heads based on the distance that each mounting head moves between one of a plurality of component supply units that supply components to the mounting heads and the board.

Abstract: The method for providing the solder connection of the present invention is a method for providing a solder connection, which electrically connects a first electronic component having a solder bump to a second electronic component having a protruded electrode to provide electrical connection between the first solder bump and the protruded electrode, wherein a relation of: A+B>C is satisfied, where a height of the first solder bump from one surface of the first electronic component is presented as A [?m], a height of the protruded electrode before the compressive deformation from one surface of the second electronic component is presented as B [?m], and a thickness of the adhesive agent layer is presented as C [?m], and further comprising: disposing the adhesive agent layer in the first electronic component; and deforming the first solder bump and the protruded electrode and providing a contact of the above-described protruded electrode with the above-described first solder bump, so that the sum of the heigh

Abstract: A method for manufacturing a printed circuit board, including providing a core substrate and an electronic component contained in the core substrate, the electronic component having a die pad, forming a positioning mark on the core substrate, forming an interlayer insulating layer over the core substrate and the electronic component, forming a via hole opening connecting to the die pad of the electronic component through the interlayer insulating layer in accordance with the positioning mark on the core substrate, and forming a via hole structure in the via hole opening in the interlayer insulating layer such that the via hole structure is electrically connected to the die pad.

Abstract: A method and apparatus for engine piston installation in which robots are used for the entire engine piston installation process. A first robot equipped with a stuffing gripper and force control picks up a piston with a connection rod, detects the piston ring presence, squeeze the rings, find the engine cylinder bore, and stuffs the piston into the cylinder bore. A second robot can be used to load and unload the engine block, hold the block and position it to the location, and indexes the crankshaft into the proper orientation for each cylinder bore. A set of tools either fixed on a stationary station or on a third robot is used to guide the piston connecting rod, transport and place on the connecting rod cap, and fasten the cap onto the connecting rod. The piston connecting rod guiding process may be omitted in piston stuffing for some types of engines.

Abstract: A compressor has a housing assembly and at least one rotor held by the housing assembly for rotation about a rotor axis. The rotor has a first face and a first housing element has a second face in facing spaced-apart relation to the first face of the rotor. One or more spacer elements are positioned from the first housing element. The spacer elements are machined. A coating is applied over the first surface around the one or more spacer elements.

Abstract: A method of manufacturing a connecting rod assembly including the steps of defining a small end of a connecting rod assembly having a terminal end and then defining a pin bore extending through the small end of the connecting rod assembly. A pair of channels is formed on opposite sides of the small end of the connecting rod assembly wherein the axis of each of the channels is substantially perpendicular to the axis of the pin bore. At least partially annular grooves are formed within the pin bore adjacent the distal end of the pin bore. The connecting rod assembly is then machined to reduce the width of the small end between each channel and the terminal end to provide a small end having a reduced width configuration wherein the grooves are disposed along at least a portion of the distal end to reduce the need to deburr the area adjacent the pin bore.

Abstract: There is disclosed a process of forming reinforcements, baffles and seals having malleable carriers. The process typically includes application of an activatable material to a malleable carrier and contouring of the activatable material the malleable carrier or both.

Abstract: A shaving system having replaceable blade cartridges is provided with a simple connector for pivotably mounting the cartridge, and for attaching to a handle with a simple latch mechanism. Embodiments include a handle having a handle body, and a connector mounting portion at the front of the handle body with a substantially horizontal bottom wall and an inwardly-extending, elastically deformable cantilever latch. The connector has a cartridge mounting structure, and a handle attachment portion extending rearward from a central body.

Abstract: A folding hand saw includes a first housing, a transmission unit disposed in the first housing, a second housing having a third pivotal end pivotally connected with a second pivotal end of the first housing and connected with the transmission unit, and a saw blade having a forth pivotal end pivotally connected with a first pivotal end of the first housing and connected with the transmission unit such that the saw blade is pivotable between a folded position where the saw blade is inserted into a first insertion groove of the first housing and a second insertion groove of the second housing, and an unfolded position where the saw blade leaves the first insertion groove and the second insertion groove. As a result, the folding hand saw of the present invention can prevent the saw blade from hurting a user or other people.

Abstract: A hand-held hair cutting appliance has a housing, a first cutting blade, and a second cutting blade. The first cutting blade is capable of reciprocating movement relative to the housing. A drive assembly is operatively connected to the first cutting blade for drivingly reciprocating the first cutting blade relative to the housing such that the first cutting blade is moveable in a side to side direction relative to the housing and the second cutting blade. A counter weight is adapted for reciprocating movement relative to the housing in response to reciprocating movement of the first cutting blade. The counter weight has at least one of a mass and a location relative to the first cutting blade to thereby at least partially counter-balance the reciprocating movement of the first cutting blade.

Abstract: A pressing handle is connected to a moveable blade having a hook-shaped engaging slot near the outer edge of an aperture to which a gripping handle fixed blade is pivoted. A containment space is formed by the junction of the gripping handle and a side of the fixed blade. The containment space has an arc-shaped opening, and the fixed blade has a positional aperture at a position corresponding to the opening. An end of an engaging member has an axle aperture and another end forms an engaging end, with a concave region formed between the two ends. A positioning pin passes through the engaging member and a torsion spring and is attached to the positional aperture. A push button-shaped body has a tongue at its lower end, an edge of which extends as a stop, and the tongue and the stop are both slidably mounted in the containment space.

Abstract: A pruning hook includes a handle unit, an adjusting unit mounted on the handle unit and a cutting unit mounted on the adjusting unit. The adjusting unit includes a support member mounted on the handle unit, a fastening member releasably mounted on the support member and an adjusting member having a first end provided with an adjusting ball rotatably mounted between the support member and the fastening member and a second end provided with a locking tube connected with the cutting unit. Thus, the adjusting ball of the adjusting member is rotatable and movable between the support member and the fastening member so as to adjust the angle and position of the cutting unit relative to the handle unit in a spherical and three-dimensional manner.

Abstract: An electric can opener for opening a top of a metal can which includes a housing that has a top end and a front side. A can cutting mechanism is on the front side of the housing proximate the top end of the housing. A hand held jar grip is removably mounted on the top end of the housing. The top end of the housing includes a recess that receives an interior surface of the hand held jar grip.

Abstract: A sighting device for a bow (or other tool) that includes an eye alignment assembly. A frame is attached to the bow using a mounting bracket. The frame includes a leading edge oriented toward a user, a trailing edge oriented down range of the bow, and a tapered inner surface generally surrounding a viewing opening. The tapered inner surface tapering outward from the leading edge toward the trailing edge. A plurality of sight points on sight pins are located in the viewing opening. The sight points are configured to align the bow with a target viewed through the viewing opening. The eye alignment assembly includes the tapered inner surface substantially concealed behind the leading edge when the frame is located at a particular orientation relative to the user's eye.

Abstract: An apparatus for measuring an angle of inclination of a tangent to a centerline curve of a tube includes a shuttle and a clinometer rotatably fixed to the shuttle. The shuttle comprises a pair of circular end plates and a shaft that joins the end plates. A carrier is attached to the shaft and the clinometer is fixed to the carrier. The shaft is rotatable with respect to the end plates, or the carrier is rotatable with respect to the shaft. The method of determining curvature of a tube having a centerline curve comprises measuring angles of inclination of the tangent to the centerline curve at a plurality of axial locations along the tube.

Abstract: A plumb post apparatus for retaining a mason's line for laying a brick course, the apparatus comprising two vertical posts each having two legs of adjustable length that pivot outward to form stabilizers. The legs are secured to adjacent sides of the posts, thus extending at right angles to each other. The posts can be secured via spikes through base plates at the bottoms of the posts and the legs are secured in place via stakes that are pivotally secured to the ends of the legs and which can be driven into a ground surface. Levels on adjacent sides of the posts indicate when the apparatus is in level disposition.

Abstract: A glove holder is disclosed for coupling a glove to an air vent. The glove has a body defining an interior cavity. The body has an aperture for accessing the interior cavity. The air vent discharging an air flow. The air flow dries the glove. The glove holder comprises a cylinder having an intake end, an exhaust end, an interior surface, and an exterior surface. The interior surface defines an interior bore extending from the intake end to the exhaust end. The cylinder is insertable through the aperture and into the interior cavity of the body for positioning the exterior surface of the cylinder adjacent to the body of the glove. A support arm extends from a first end to a second end. The first end of the support arm is secured to the interior surface of the cylinder. The second end of the support arm is positioned within the interior bore. A clamp secures the second end of the support arm to the air vent.

Abstract: A dryer includes a drying chamber, a process air guide that guides process air along the articles to pick up humidity from them, a heat sink in the process air guide that precipitates humidity from the process air as a condensate, and a condensate collector with a condensate container having an insert that is permeable to the condensate and that projects through an opening into the condensate container for transferring the condensate to and from the condensate container. The insert includes a first filter that filters particles from the condensate prior to storing the condensate in the condensate container.

Abstract: A process for feeding a slurry of thermoplastic synthetic polymer particles such as polyethylene terephthalate homopolymers and copolymers in combination with a liquid such as water at a liquid temperature greater than the normal boiling point of the liquid, under a pressure greater than the vapor pressure of the liquid at the liquid temperature, into a separation zone such as a centrifugal dryer, and within the separation zone: a. separating the liquid from the particles, and b. drying the particles; while under a high pressure equal to or greater than the vapor pressure of the liquid. There is also provided a process for decoupling the dried particles from the separation zone to an atmosphere having a pressure less than the vapor pressure of the liquid while maintaining the vapor pressure of the particles prior to decoupling equal to or above the vapor pressure of the liquid at the liquid temperature.

Abstract: A shoe has a sole including a platform for supporting a wearer's foot upon a surface. The shoe includes a heel pedestal extending from the platform beneath a wearer's heel, a lateral stabilizer pedestal extending from the platform at least partially beneath a wearer's cuboid bone, and a medial stabilizer pedestal extending from the platform at least partially beneath a wearer's navicular bone. The heel pedestal, the lateral stabilizer pedestal, and the medial stabilizer pedestal include an outsole for contacting the surface, a compressible middle layer between the outsole and the wearer's foot, and a base layer between the middle layer and the wearer's foot having a compressibility that is lower than the compressibility of the middle layer.

Abstract: Articles of manufacture and articles of wear may include one or more retractable traction elements. A plurality of the retractable traction elements may be interconnected by a base member and may form an insert. Each of the retractable traction elements may include an extension inducing element and a ground (or other surface) contacting element. The extension inducing element may flex in response to an applied force and may cause the ground or other surface contacting element to extend and engage an underlying surface.

Abstract: There is described a sports shoe, especially a golf shoe, having a sole on which downwardly projecting ground-engaging elements are mounted or can be mounted. It is provided according to the invention that the ground-engaging elements (9), or the means (10) provided for mounting them, are guided and held to move forward and backward along an arc, especially an arc of a circle.

Abstract: The invention is a rake attachment for use with an excavator arm of heavy machinery. The preferred embodiment has two cross-members that make the invention easily installed with an automated excavator arm. An alternative embodiment provides for mounting hardware for use with a traditional excavator arm, which does not have a hydraulically operated attaching device. The invention is suited for use with the clearing of loose debris in and around a typical construction site. The construction debris may comprise loose wood scraps, tree branches, fencing, and other objects typical of a construction site.

Abstract: A number of front working, trench filling face-compressing, inclinedly disposed sliders are arranged alternately with cutter bits on an endless chain of a trench-forming endless chain cutter on a transporting chassis, and driven with the chain by a drive means so that backward oriented, inclined facet portions of the sliders compress a filling in the trench toward and on a front working face of the wall being formed. An elongate, filling face-compressing shield is adapted to be extended down into the trench and supported with its underground portion on the underground portion of a guide post of the cutter or on the trench bottom for forward and backward oscillation by a drive means to compress the filling face adjacent to the shield. The compacted filling is in these ways being formed by horizontal pressure.

Abstract: A luggage tag for identifying luggage and providing promotional material includes a substrate comprising an elongated portion for forming a loop with which to attach the tag to a piece of luggage; a first scratch surface portion on the substrate which is removable to reveal a first printed indicator; and a second scratch surface portion on the substrate which is removable to reveal a second printed indicator, wherein, if the first and second printed indicators match, the tag is a prize winner. The substrate has a detachable portion, the second scratch surface being disposed on the detachable portion of the substrate. The elongate portion for forming the loop and the first scratch surface are disposed on a main portion of the substrate which remains as the luggage tag after the detachable portion is detached.

Abstract: This disclosure provides a portable shopping aid used to mount a shopping list, coupons, or other documents. Contrary to conventional wisdom, the aid is configured to sacrifice a writing surface in favor of portability, by providing a small body that may be easily inserted into a pocket or handbag. The body includes a clamp for mounting the aid onto a push bar of a shopping cart, for hands free viewing during shopping, as well as a document clip mechanism that clips documents by their ends closest to the push bar. In order to provide structural rigidity to retained documents, and notwithstanding the absence of a writing surface or clipboard, the clip mechanism is configured to crease documents. The shopping aid also includes feet for standing the aid upright, on a flat surface, and means for mounting the aid magnetically on a refrigerator wall, in all cases such that retained documents are presented in a convenient reading orientation.

Abstract: A support assembly for a digital photo frame is provided. The support assembly comprises a base member, a pivot member, a support arm, a positioning structure, and a an elastic member. The base member comprises two side walls spaced from each other. The support arm comprises a connection end disposed between the two side walls and is rotatably attached to the base member via the pivot member. The connection end comprises a first surface and a second surface opposite to each other. The pivot member is attached across the two side walls. The positioning structure is disposed on the first surface and the side wall opposite the first surface and comprises a projection portion and at least two concave portions. The projection portion is capable of being received in the at least two concave portions, the two concave portions intersect to form an edge.

Abstract: A muzzleloading rifle includes an action and a barrel assembly attached to a forward end of the action. The barrel assembly includes a barrel, a barrel extension and an intervening wall. The barrel has a breach end, a muzzle end and a primary chamber at the breach end for receiving a primary charge loaded through the muzzle end. The barrel extension is attached to the breach end of the barrel and includes a casing chamber positioned rearwardly from the primary chamber. The casing chamber is configured to receive a standard ammunition casing with an integral primer therein. The intervening wall separates the primary chamber from the casing chamber. The intervening wall includes a flash hole communicating between the casing chamber and the primary chamber.

Abstract: A shotgun includes an action that locks the firing pin in a retracted position when the action is not closed. In one embodiment, the firing pin is held in a retracted position without the use of a spring, which may fail over time. In another embodiment, the action includes a bolt slide that is configured to hold the firing pin in the retracted position when the action is open.

Abstract: A caliber exchange system for a firearm including a lower plate adapted for embedding within a firearm stock, an upper plate adapted to mate with the lower plate, and a receiver and integral barrel assembly attached to the upper plate to form a caliber exchange unit, the caliber exchange unit attachable and detachable from the lower plate to allow user exchange of caliber of the firearm.

Abstract: A gun barrel cleaning tool for receiving and enclosing a gun barrel while guiding a cleaning brush back and forth through the enclosed gun barrel. Cleaning fluid is introduced through a suitable passage way into the interior of the apparatus and a cleaning brush may thereafter be passed back and forth through an enclosed gun barrel in order to clean it.

Abstract: A rifle telescope has optics having an optical axis, a scope support portion that supports the optics, and a base portion that mounts to a firearm having a barrel axis. The scope support portion has at least two different settings, each setting providing a different angle between the optical axis and the barrel axis. The invention may also include each setting being a discrete fixed setting. The present invention also includes a method for adjusting the angle mount of an adjustable rifle telescope with multiple fixed angle mount setpoints.

Abstract: A device is provided for securing against crime-of-opportunity theft at least one fishing rod and reel to be stored or transported in an outdoor, unsecured area or on an open, unsecured portion of a vehicle, such as an open bed of a pick-up truck, trailer, or boat.

Abstract: A fishing lure includes a weighted hydrodynamic head, mated artificial bait and pivoting hook. The weighted hydrodynamic head includes an integrally molded, conically-shaped or pyramid-shaped malleable body with a plurality of fins projecting laterally therefrom, a blunt leading edge, a trailing edge, a central passage extending from the leading edge to the trailing edge, and a slot formed in the side of the body and extending into the central passage. The weighted hydrodynamic head is made of a dense material such as lead. The hook is an offset hook including an eyelet, a proximal shank, an offset bend section, a distal shank, a u-shaped bend and a pointed barbed tip. The distal shank and proximal shank are substantially parallel. The eyelet, which projects through the central passage in the leading edge and the distal shank, is aligned with and extends longitudinally from the slot.

Abstract: A leg snare apparatus and method for capturing animals uses a mechanical throw arm, that when triggered by an animal of sufficient size stepping on the pan, throws a snare up and around the leg of the animal. The pan tension of the device may be readily adjusted to avoid being triggered by lighter weight non-target animals, and the pan may also be leveled. Moreover, the snare is supported so that it cannot be readily dislodged after the apparatus is set, the loop is not deflected out of its proper position when the apparatus is triggered, and the loop is retained in place until the throw arm has moved it high up the animal's leg or foot. Should the apparatus be triggered by larger, non-target animals, the apparatus includes a break-away snare to allow the animal to escape.

Abstract: The present invention is directed towards an improved flying insect trap, in the form of a housing and internal disposable portion. In one embodiment, the exterior portion comprises roof and body panels which are manufactured from a poster board paper stock that is printed on opposing sides with contrasting colors. The interior portion comprises a self-adhesive assembly constructed from a heavy weight chipboard material that is preferably white that surrounds an internal attractive element.

Abstract: A collapsible enclosure includes a mount having a central shaft and a shell carried by the central shaft. The shell includes a first plurality of support arms carrying a cover and a second plurality of support arms pivotally connected with the first plurality of support arms for articulating the first plurality of support arms from a first generally linear position to a second generally bowed position for presenting the cover into a generally hemispherical configuration. Additionally, the first and second plurality of support arms is carried by the central shaft in a manner enabling the shell to traverse the central shaft when the cover is in the generally hemispherical configuration.

Abstract: A flower holder keeps a flower looking fresh during a long period of time, under adverse weather conditions with temperatures under 40° Fahrenheit. The flower holder includes a rod with one of its ends inserted into the ground, at least one ring holder connected to the vertical rod, an elongated tube including a cap on each end, the elongated tube slides through the ring holder.

Abstract: A mullion assembly (10) includes a top mounting block (92) attached to a top beam (24) of a door frame (22) and having a positioning rod (128) extending in a horizontal direction. A bottom mounting block (132) is mounted on a floor (20) and spaced from the top mounting block (92) in a vertical direction. A post (40) is detachably mounted between top and bottom mounting blocks (92, 132). A brace (50) is mounted to an upper end (42) of the post (40). A mounting bracket (140) is mounted to the brace (50). A pivotal plate (180) is pivotably mounted to the mounting bracket (140) and detachably engaged with the positioning rod (128). A retaining member (198) is mounted to the mounting bracket (140) to lock the post (40) between the top and bottom mounting blocks (92, 132).

Abstract: A sliding door structure comprises at least one door or plate (12), and a substantially horizontally arranged track device (13). The track device (13) includes a stationary track part (14) and at least one door carrier (16) for carrying the door. The door carrier is supported by the stationary track part (14) at one or more supporting points and displaceable horizontally in relation to said track part between first and second opposite positions. The door (12) is connected to the track device (13) such that the center of gravity of the door or plate (12) is spaced horizontally from the adjacent supporting point by a distance being a substantial fraction of the width of the door or plate (12). Thus, the door (12) is supported by the carrier (16) in a cantilever-like manner and the length of the track (13) may be reduced to a value substantially corresponding to the width of the door opening (11).