Abstract: A food dehydrator with a heating element located beneath a fan in a chamber of the food dehydrator. The heating element includes resistors, connected in series, sandwiched between and in thermal contact with two heatsinks to heat and dry the air within a volume defined by the chamber.

Abstract: A method for removing oil from seed flakes, including introducing seed flakes into an extractor, thereby producing an extracted seed flake stream and a miscella stream, introducing the extracted seed flake stream into a DTDC column, thereby producing a first solvent recycle stream and a seed meal stream, and introducing the miscella stream into a distillation system, thereby producing a second solvent recycle stream and a seed oil stream.

Abstract: A composting facility includes: a floor for receiving compostable material thereon, wherein the floor is constructed above-grade; a dovetail extending from the floor to allow ingress of a vehicle from a grade level to the floor; one or more channels defined within the floor and extending through the dovetail; a covering extending over the one or more channels to maintain the compostable material away from the channel, the covering defining at least one aperture extending from above the covering into the one or more channels for allowing flowthrough of gases; and an air source for providing air through the channels to provide cooling characteristics to the compostable material or oxygen to aid an aerobic process associated with composting. In operation, liquids draining from the composting material pass through the at least one aperture into the channel and out through a portion of the channel extending through the dovetail.

Abstract: The present invention provides a method of handling a solvent-containing solids stream in a non-aqueous oil sand extraction process, the method including the steps of: (a) providing a solvent-containing solids stream at a first pressure; (b) depositing the solvent-containing solids stream provided in step (a) as a bed in a vessel; (c) discharging the solvent-containing solids stream from the vessel at a second pressure via an outlet, thereby obtaining a depressurized solvent-containing solids stream; wherein the solvent-containing solids stream in the vessel in step (b) is at a temperature above the boiling point of the solvent in the depressurized solvent-containing solids stream at the second pressure in step (c).

Abstract: A drying fan has a shroud with a shape selected to improve fan efficiency by designated fluid dynamics of air flow through the fan.

Abstract: A tactile plate assembly used as a tactile warning device on walkways comprises a plurality of tactile plates with texture for providing tactile awareness. A connecting bracket attaches first and second tactile plates to each other to form a pair of tactile plates. Interlocking brackets, having first and second ends, attach two pairs of tactile plates together, forming a tactile plate subassembly. The interlocking brackets each includes a first end with a tab extending at an angle and a second end with a hole. The interlocking brackets can mate with one another to allow connection of multiple tactile plate subassemblies together. The interlocking brackets include multiple holes of sufficient size to allow a substrate such as concrete or asphalt to flow therethrough to anchor the tactile plate assembly in place. The connecting brackets may also include similar holes of sufficient size to allow a substrate to flow therethrough.

Abstract: A clothes drying apparatus mounted to a building structure (e.g., a ceiling, wall, or floor) and including a slider track coupled to the building structure, and a frame (e.g., at least two frames) secured to the slider track for sliding between a stored position and an extended position. The frame is pivotable relative to the building structure. For example, the frame can be secured to the slider track, and the slider track can be pivotable relative to the building structure. Preferably, the slider track includes an inner member coupled to the building structure and an outer member coupled to the frame. The apparatus can further include transverse brackets supporting the slider track. For special mounting situations, the apparatus can further include longitudinal brackets supporting the transverse brackets and/or a back mounting bracket at least partially supporting the transverse brackets.

Abstract: A system and method for controlling blisters. The method begins by mixing the ingredients to form a dough with a moisture content between about 35% and 60%. The dough is sheeted and cut. Thereafter, the dough is pre-heated to reduce the moisture content to between about 10% and about 45%. The preforms are then docked and dehydrated. The docking system, in one embodiment, has a backing plate and a docking device with at least two docking pins of varying lengths. The docking device is adjustable relative to the backing plate. The system also has a removing plate which removes preforms from the docking pins.

Abstract: In a sludge treatment installation, a movable carriage is arranged transversely above a work surface of a floor. The movement of the carriage by longitudinal translation over the floor is initiated by a first drive shaft carrying a toothed wheel meshing with a drive chain. A second chain helps to guide the carriage. On the carriage is provided a rotary turning tool which engages in the sludge. Driven in rotation by a second drive shaft independent of the first, it includes pairs of semi-cylindrical paddles fixed substantially symmetrically by one of their edges on either side of a shaft driven by the second drive shaft. The two paddles in each pair of paddles are asymmetrical as a result of having different radii, with a difference at least equal to about 5%. Forced ventilation acts directly on the paddles.

Abstract: A pallet drying device promotes drying after washing of a pallet including a fork insertion hole into which a fork is inserted on a side surface and an opening communicating with the fork insertion hole on a lower surface. The pallet drying device includes: pallet placing means capable of placing the pallet to be dried so as to mechanically block the opening; and blowing means for blowing air into the inside of the fork insertion hole. The pallet is placed with the opening on the lower surface blocked while air is blown into the fork insertion hole, thus the air blown into the fork insertion hole is not discharged from the opening. This configuration promotes drying the inside of the fork insertion hole.

Abstract: Disclosed is a laundry drying rack. The laundry drying rack in accordance with an embodiment of the present invention includes a plurality of fixing hangers disposed in parallel to each other on a drying rack frame on which laundry is hung, a plurality of oscillating links each performing a swing motion with respect to each fixing hanger as a pivot axis, a plurality of oscillating hangers each connected to a lower end of the oscillating link and shaking the laundry, hung on the fixing hanger, at the bottom of the corresponding fixing hanger, a driving unit generating power, and an electric unit providing the power generated by the driving unit as an oscillating force for the oscillating links.

Abstract: A drying basket for a clothes dryer, comprising a longitudinal support and a wire basket fastened thereto. A connecting device is integrally configured on the longitudinal support and can be engaged with an opening provided on the clothes dryer. For this purpose, an opening is provided on the clothes dryer in a section of the clothes dryer housing, with which the connecting device of a drying basket can be engaged.

Abstract: A drying rack assembly for drying and storing baby bottles and other component parts of baby bottles thereon including a base housing having an air duct inlet and a fan associated therewith, and at least one trunk module having at least one branch associated therewith, each trunk module having a passageway extending therethrough in communication with the air duct inlet and each branch having a passageway extending therethrough in communication with a trunk passageway. The fan is positioned in the vicinity of the air duct inlet for directing the flow of air through said at least one trunk module and through said at least one branch to assist in drying an item positioned on said branch. A plurality of trunk modules can be assembled in a modular configuration to increase the storage capacity of the overall assembly.

Abstract: A device for a supplying a gas flow to products, for example for a dry or freeze procedure, comprising a top and bottom grid, which are located parallel at a certain distance above each other, which top and bottom grid are both provided with a large amount of passage openings for the gas flow and in which, during operating, the to the gas flow subject products can be arranged on the upper grid, as well as flow generating means for generating and for providing the gas flow through the top and bottom grid towards the products. According to the invention the distance between the top and bottom grid is at least substantially equal to the diameter of the balls such that the balls are only able to be arranged in a single layer between the grids.

Abstract: An improved sports equipment frame includes frame having a main vertical member including an upper end and a lower end, and a plurality of extensions projecting laterally from the main vertical member; and a bowed hanger extending from the main vertical member for draping an article of clothing, the hanger elevationally located between the upper and lower ends of the vertical member. In a preferred embodiment, the sports equipment rack includes pant leg restrainers for suppressing movement of the legs of pants during spray washing, and a headgear support plate having a generally flat upper surface that is larger than the cross sectional area of the vertical member. The sports equipment rack is lightweight, compact and portable, and is suitable for storing, organizing, washing and drying various types of sporting equipment and clothing.

Abstract: The invention relates to a method and to an accompanying facility (1) for drying plant material (19), such as, for example, fruits, spices, plants, herbs and the like, by means of a stream of drying gas which is supplied to a drying installation. The method according to the invention is distinguished by the fact that the material to be dried is distributed to a plurality of trays (15-17) of the drying installation (1), which trays are arranged one above the other and through which gas can flow, where each tray is supplied with a portion (10, 11) of refreshed and conditioned drying gas so that an almost uniform drying rate of the material to be dried is obtained on the individual trays.

Abstract: The present invention provides a drying apparatus, which uses to dry a pre-formed material of alignment film on a first surface of a substrate. The drying apparatus comprises a heating platform, a first support net, a plurality of support pins and a first elevating mechanism. The heating platform uses to heat a second surface of the substrate; the first support net comprises a plurality of first filaments, and the first filaments commonly define a plurality of first meshes; the support pins are set in at least one portion of the first meshes; and the first elevating mechanism controls the support pins to rise and lower, so that the support pins are higher or lower than the first support net. Thus, the present invention can avoid the first surface of the substrate from remaining Mura after the drying step.

Abstract: A clothes drying apparatus mounted to a building structure (e.g., a ceiling, wall, or floor) and including a slider track coupled to the building structure, and a frame (e.g., at least two frames) secured to the slider track for sliding between a stored position and an extended position. The frame is pivotable relative to the building structure. For example, the frame can be secured to the slider track, and the slider track can be pivotable relative to the building structure. Preferably, the slider track includes an inner member coupled to the building structure and an outer member coupled to the frame. The apparatus can further include transverse brackets supporting the slider track. For special mounting situations, the apparatus can further include longitudinal brackets supporting the transverse brackets and/or a back mounting bracket at least partially supporting the transverse brackets.

Abstract: A dispensing vessel for introducing moisture into a clothes drying environment includes a sponge-like core configured to at least temporarily retain a moistening substance therein, a generally oblong-shaped cover substantially surrounding the core and retaining the core in a compressed condition, and a moistening substance retained within the core. The cover includes a fill opening defined therethrough, the fill opening providing access to an interior of the cover from an exterior of the cover, a plurality of protuberances spaced generally evenly from one another, each protuberance having a generally conical shape, and one or more dispensing openings, each dispensing opening disposed at a distal end of a protuberance of the plurality of protuberances, and each dispensing opening providing access to an exterior of the cover from an interior of the cover. Furthermore, each of the dispensing openings is not positioned generally opposite the fill opening.

Abstract: A method for drying sensitive articles, essentially textiles made of wool, which are to be dried in the washing drum of a clothes dryer using a computer program. According to known methods for protecting sensitive articles to be dried during a drying program, the articles to be dried are introduced into a protective device which, filled with the articles to be dried, is then inserted into the washing drum before the start of the drying program. In order to prevent damage to the sensitive articles to be dried whenever the protective device is not used, a warning signal is generated prior to the start of the drying program when the protective device containing the sensitive articles to be dried is not properly fixed to the clothes dryer.

Abstract: The present invention relates to a laundry dryer having an improved structure, which can remove wrinkles of laundry during a drying cycle after washing. A dryer includes a cabinet in which various parts are installed; a drum rotatably mounted in the cabinet, the drum holding laundry therein; a heater that heats air to supply hot air to the drum; a steam generator that generates steam to supply the steam to the drum; a water container that has an outlet to supply water to the steam generator; a water supply path provided between the steam generator and the water container; and a contact prevention part that prevents the remaining water of the water container or the water supply path from contacting with the various parts provided in the cabinet, wherein the remaining water is the water remaining in the water container or the water supply path when the water container is detached from the water supply path.

Abstract: An apparatus for heating an electronic component, the apparatus includes a table on which a printed board is placed, a heating head having a contact surface that comes into contact with the upper surface of a rectangular electronic component mounted on the upper surface of the printed board, a discharge portion that jets heated air; and a first passage that guides the air discharged from the discharge portion to the four vertexes of the electronic component.

Abstract: In a sludge treatment installation, a movable carriage is arranged transversely above a work surface of a floor. The movement of the carriage by longitudinal translation over the floor is initiated by a first drive shaft carrying a toothed wheel meshing with a drive chain. A second chain helps to guide the carriage. On the carriage is provided a rotary turning tool which engages in the sludge. Driven in rotation by a second drive shaft independent of the first, it includes pairs of semi-cylindrical paddles fixed substantially symmetrically by one of their edges on either side of a shaft driven by the second drive shaft. The two paddles in each pair of paddles are asymmetrical as a result of having different radii, with a difference at least equal to about 5%. Forced ventilation acts directly on the paddles.

Abstract: A drying system for a hair removing device is capable of effectively drying the cutter head. The drying system includes a casing having a dry chamber configured to detachably receive a cutter head of the hair removing device, a heater for heating the cutter head; and a blower for generating a forced air flow and drying the cutter head. The casing is formed with an air flow channel configured to direct the forced air flow towards the cutter head. A tray is provided to define the bottom of the dry chamber and bear the cutter head. The tray is formed with a draft port through which the flow channel communicates into the dry chamber so that the forced air flow can be directed straight to the cutter head for effectively cooling or drying the cutter head.

Abstract: The invention relates to an appliance (1) for the removal of fluids and/or solids from a mixture of particulate materials with a container (2) that constitutes a ring-shaped processing space (20) with a cylindrical outer contour with devices for the charging and discharging of the particulate material into and out of the processing space (20) and with a fan device (5) for supplying a fluidization agent from underneath into the processing space (20) as well as devices (6) for the processing of the fluidization agent in the flow direction in front of the fan device, whereby in the processing space (20) cells (15, 16, 17) are formed extending in the vertical direction, where one cell constitutes a discharge cell (17) through which there is no fluidization agent flow from underneath, where at the lower end of the discharge cell the discharge device is arranged, and where another cell (15) is provided with a charge device, and where the cells (15, 16, 17) are open at their upper ends in order to enable the transpo

Abstract: There is provided a dry board received and fixed in a dry drum. The dry board is mounted in the dry drum and laundry such as shoes can be stably dried.

Abstract: Household appliance comprising an outer casing (2) provided with a worktop (3), wherein said worktop (3) comprises a plurality of apertures (7), each one of which is fluidly connected with conveying means adapted to deliver a flow of air through said apertures (7) for drying garments laid upon the same worktop.

Abstract: A drying rack assembly, for use in a clothes dryer with a rotatable tumbler, is constructed with a perforated tray to support clothing in a stationary manner within the tumbler. A duct is attached to the perforated tray to direct a primary airflow through the perforated tray and to at least a portion of air outlet opening in the tumbler cavity. The duct further includes openings to provide a secondary path by which a portion of the total airflow is allowed to bypass the perforated tray. A movable damper is provided to allow variable bypass airflow. An air outlet cover, attached to the combination of the duct and perforated tray, is adapted to cover the portion of the air outlet opening that does not interface with the duct. The air outlet cover is movable to a second position to enable compact storage. A hanging feature is further provided on the side of the dryer cabinet to provide a convenient storage space.

Abstract: A replaceable precursor tray for use with a high conductance, multi-tray solid precursor evaporation system coupled with a high conductance vapor delivery system is described for increasing deposition rate by increasing exposed surface area of solid precursor. The multi-tray solid precursor evaporation system is configured to be coupled to the process chamber of a thin film deposition system, and it includes a base tray with one or more stackable upper trays. Each tray is configured to support and retain film precursor in, for example, solid powder form or solid tablet form. Additionally, each tray is configured to provide for a high conductance flow of carrier gas over the film precursor while the film precursor is heated. For example, the carrier gas flows inward over the film precursor, and vertically upward through a flow channel within the stackable trays and through an outlet in the solid precursor evaporation system.

Abstract: A process for lyophilizing a solution of an active agent in a container is provided. Solution of active agent is deposited into a container, the container is covered with a covering plate and placed inside a lyophilizing apparatus. Lyophilization can be conducted to dryness by radiation, convection or both. Also provided is a device made by this process, an active agent-plastic administration device (e.g., a syringe), containing an active agent in the form of lyophilized cake, and an array of such administration devices.

Abstract: A device that dries a wet surface, or defrosts a frozen surface, and warns of a slippery condition created by the wet surface, or any hazardous condition in that vicinity. The wet surface may be dried by a fan circulating heated or non-heated air discharged from the center of the hazardous location in an efficient 360 degree pattern via a diffuser. The warning may be visual or audible. The device may be battery powered or powered via a standard extension cord from a common power outlet. The battery may be rechargeable from either standard power outlets or onboard solar cells. The device may be able to disperse deodorizers or insect repellent or insecticides or any combination of these. The device may be able to filter the air. The device is typically quite portable.

Abstract: A modular support system for a bed of organic filter medium has provision for adjusting the distribution of gases in the plenum defined below the filter bed platform. Once the filter bed platform has been fully erected, with a gas inlet below the platform, slide gates are positioned in special modules which define a gas distribution channel, preferably extending in a series to form a line in the assembled support platform. The slide gates, one at each side of the special flow distribution modules, are adjusted as to the depth of penetration down into the plenum, so as to close the sides of the flow distribution channel to varying degrees along the length of the channel, effective to balance the flow of gases up through the perforations in the platform modules. The proper gate setting can be determined empirically after erection of the filter bed platform, by flowing gas through the platform and checking the distribution of gas exiting the holes in the modules.

Abstract: An apparatus for treating particulate material has an elongated, tunnel-like process chamber, along which the material to be treated can be moved from an inlet to an outlet. A bottom of said process chamber is designed in that two flows of introduced process air are oriented transversely with respect to the longitudinal direction and impinge on each other along a breaking-up zone. Arranged in the bottom are air guide elements which can be adjusted by an adjustment device in that the process air can have superimposed on it a variable movement component in the longitudinal direction.

Abstract: A horizontally extending hose cleaning and drying apparatus includes a plurality of rack sections connected at ends thereof to create an elongated rack having a slope. Each rack section includes an upper plate having apertures or mesh material to allow water to fall therethrough. Legs are detachably connected to each rack section, the shortest legs being attached to a rack section at one end of the rack and the longest legs being attached to a rack section at the opposite end of the rack to create the slope. Preferably, the rack is of a length of at least 50 feet to accommodate fire hoses.

Abstract: A replaceable heat transfer module. The replaceable heat transfer module has an inlet floodbox with fluid distribution passageways, an outlet manifold with fluid collection passageways, and extending in a fluid tight relationship between the fluid distribution passageways and the fluid collection passageways, a thin, elongate evaporator envelope. The evaporator envelope has a lower flexible planar sheet and an upper flexible planar sheet, each having inner surfaces located in a back-to-back spaced apart relationship. The evaporator envelope has an upper end wherein the lower and upper flexible planar sheets are fluidly sealed to the inlet floodbox, and a lower end wherein the lower and upper planar sheets are fluidly sealed to said outlet manifold. Mylar brand polyester is used for construction of the evaporator envelope. A marginal area on each side extends lengthwise transversely beyond the inlet floodbox and the outlet manifold to provide sloping sidewalls for containment of a working product.

Abstract: A garment drying apparatus (200) is disclosed having a frame (201), a porous net 204, slip proof pads (205,206), an adjustable width garment hanger (202) and a hook (203) to support said adjustable width garment hanger; the frame (201) rests at an acute angle from the floor to provide iron free drying effect.

Abstract: A process for lyophilizing a solution of an active agent in a container is provided. Solution of active agent is deposited into a container, the container is covered with a covering plate and placed inside a lyophilizing apparatus. Lyophilization can be conducted to dryness by radiation, convection or both. Also provided is a device made by this process, an active agent-plastic administration device (e.g., a syringe), containing an active agent in the form of lyophilized cake, and an array of such administration devices.

Abstract: The disclosed invention provides an improved method of drying wet or water damaged surfaces. The method uses a vacuum source, a manifold, and a plastic sheet covered grid. The grid includes a lattice formation with spaces to permit moisture and air to pass from and beneath the surface to the vacuum source.

Abstract: A toothbrush dryer includes a housing formed as a heating chamber for storing toothbrush in the housing, and a heating device provided in the housing preferably at a bottom portion of the housing for warming the toothbrush for keeping a dried toothbrush for preventing bacteria, fungi or algae infection or contamination.

Abstract: Ventilation element for a cooler for cooling bulk material, comprising a tray-like component provided with at least one opening for the supply of cooling gas as well as an insert which can be releasably fixed in the tray-like component and forms a support surface which can be ventilated from below for the bulk material, the insert consisting of a plurality of longitudinal profiled sections and connecting elements disposed transversely with respect thereto. The longitudinal profiled sections and the connecting elements are constructed in such a way that they can be pushed into one another during assembly of the insert.

Abstract: A baby bottle dryer and organizer is herein described. The bottle dryer has hollow posts onto which baby bottles are placed and a blower/fan that blows drying air up into the posts, thus drying the interior of the baby bottles. The bottle dryer further has a removable tray for drying baby bottle nipples and rings/caps into which are from the blower/fan flows. The bottle dryer also has a lid and a front door to protect the baby bottles, nipples, rings/caps from dust and debris.

Abstract: An improved process for removing trace solvent from a material comprises rewetting the product with water during the drying process. Finished products such as suramin are produced efficiently to a high quality on a factory scale.

Abstract: A system for separating hydrocarbons from a material which includes a process chamber, a process pan operatively connected to the process chamber and removable therefrom, a blower operatively connected to the process chamber and to a heat source, the blower adapted to force heated air into the process chamber through the material disposed on the process pan, the forced heated air adapted to vaporize hydrocarbons and other contaminants disposed on the material, and at least one condenser operatively connected to the process chamber and adapted to condense the vaporized hydrocarbons and other contaminants is disclosed. Further, a method for separating hydrocarbons from a material which includes passing a stream of heated air over the material to volatilize the hydrocarbons, passing the stream of heated air containing the hydrocarbons through at least one condenser to form liquid hydrocarbons, collecting the liquid hydrocarbons, and recirculating the heated air is disclosed.

Abstract: A hot air drying apparatus for noodles which makes possible steady production of high quality instant noodles by blowing hot air at an optimal velocity and in an optimal flow rate all over noodle ribbons to be dried in a short period of time and thereby makes a texture of noodle ribbons uniform and fine is to be provided. In a hot air drying apparatus, a conveyor runs from one end of a lengthwise direction of this apparatus to the other, and noodle ribbons carried from a preceding step riding on this conveyor move within an apparatus at a prescribed speed. The apparatus includes a plurality of drying chambers D1, D2, D3, D4, D5 and so forth into which it is divided in the lengthwise direction.

Abstract: This device aids in the drying or curing process of a turkey tail. The device consists of a flat surface (back plate) with holes and dowels to tack the individual primary turkey tail feathers in a desired drying position. Also, the lower section of the back plate consists of a tray used to contain a chemical that will hasten the drying time. A stabilizing block is placed in the chemical tray over the meaty part of the turkey tail and fastened to the back plate with a bolt and wing nut. The device and the turkey tail can then be placed upright in a small space, or hung on a nail or screw using the slot on the rear of the back plate, for the drying duration.

Abstract: The trays (V) are provided with identical vertical spacers (4) which enable the trays to be stacked on top of each other in a centred way, with a suitable spacing betweem them, and enable the various adjacent stacks of trays to be raised and lowered in steps, by means (BM) which act only on the bottom tray of each stack. The sides of the stacks of trays of the kiln are thus free and can be engaged by conveyors (37-37′, 77-77′, 57-57′) of the means provided for the translation of the trays between the stacks, both in the normal operating cycle and in the short operating cycle. However, the lower translation conveyors (24-24′) which transfer the trays from the stack with the unloading station (K2) to that with the loading station (K1) are positioned in the usual way under the stacks of trays and transversely with respect to the trays.

Abstract: A device for treating particulate product has a process chamber for receiving and treating the product. A bottom of the process chamber is constructed from substantially plane baffle plates overlapping each other with slots formed between said overlapping plates. Process air can be introduced into the process chamber via said slots between said plates with a substantially horizontal component of motion. Said baffle plates and the resulting slots are arranged in such a way that two opposite flows of incoming process air are produced. Said two opposite flows are directed along a substantially horizontal path and meet along a breaking-up zone and are then deflected to form an upwardly directed, substantially vertical flow.

Abstract: A modular biofiltration support system is quickly erectable in virtually any size and shape using plastic modules that are interconnected at the site. Included in the system are bed platform modules which assemble together to form a bed platform to support the weight of the biofilter medium within the area defined by the frame, and a multiplicity of bed support legs which are assembled into the bed platform modules to hold the bed platform at a raised position above the ground, defining a plenum for entering gases, between the ground and the bed platform. In one embodiment, at least some of the legs include air directing vanes which can be oriented in positions to cause generally even distribution of the gases within the plenum. The bed platform modules have openings to direct the gases to flow upwardly through the biofilter medium.

Abstract: Room Air Gel Dryer contains a system of hinges for movement and alignment of frames. It has another system of latches and thumb screws for tightly holding or releasing different frames. Both of the above described systems keep various separate components stay and work together as one unit. Wall plates not only hold this gel dryer horizontal but also make it stand with excellent stability. Special grooves present in the lateral sides assist in separating different frames and in the collection of dry acrylamide gel-cellophane sandwich.

Abstract: A collapsible drying apparatus and method for forming and collapsing such apparatus, said apparatus comprising a frame having an expanded state and a collapsed state, a web substantially stretched over the frame, at least one support member coupled to the frame, and a strap having its ends coupled to the web, including a releasable fastener located a predetermined distance from one of the ends of the strap, and having adjustable length to apply a corresponding tension to the frame and the web, biasing the apparatus into a convexly accurate condition.