Abstract: An apparatus and method are described for delivering hygroscopic, corrosive chemicals such as hydrogen chloride from a source such as a tube trailer to a use point such as a semiconductor fabrication tool minimizing infiltration of moisture, and entrainment of particulates, while still reducing moisture contents below 100 parts per billion and achieving appropriate pressure drops without two phase flow.

Abstract: A coffee roaster which roasts coffee beans in an oven chamber employing both radiant and convection heating techniques while the beans are continually intermixed in a fluidized bed rotating in the horizontal plane. Roaster control means are provided to terminate the roasting process by quenching the beans and oven chamber while maintaining the beans in a fluidized bed to avoid scorching or further roasting by the residual heat of the coffee bean mass. The oven chamber includes an upper transparent section through which the roasting charge of beans may be viewed and thereby allow manual control of the process in response to visual observation.

Abstract: An ice-gripping sandal for securement to the sole of a boot or other primary footwear. The sandal comprises a sole and plural attachment straps for mounting the sandal on the boot. The sandal's sole has a bottom surface having plural ice-gripping teeth. The attachment straps are secured to the sole and comprise a short front strap and a long front strap and a pair of short rear straps. The long front strap is arranged to be extended through a loop in the short front strap and about the upper of the boot through loops in the rear straps so that its free end is connected to a buckle mounted on the short front strap at the toe of the boot, thereby forming "figure 8" strap pattern. A pair of cooperating VELCRO.RTM. fastening strips are secured onto the long strap to hold the long strap in the buckle.

Abstract: A shoe and method of forming the same having an upper portion which includes an individualized indicia display area in any one of the side quarter panel, tongue, or heel portion of the upper portion of the shoe. The shoe includes an outer covering material in which a window or opening is formed to make visible and accessible an indicia attachment panel underlying the outer covering material. An indicia display panel is adhered to the indicia attachment panel. The display panel is formed from a plurality of individual indicia or is a unitary panel to which indicia, such as letters, numbers, or emblems, are applied. The purchaser has the ability to individualize the shoe in virtually unlimited manner to include a personalized message or slogan that no other purchaser may have.

Abstract: A therapeutic arch support is described, more particularly intended for therapy of disorders of the circulation of the foot, for the treatment of venous insufficiency within the area of the leg or for bedding load-sensitive feet, especially for bedding the feet of diabetics suffering from foot detects. The arch support has a multi-layer construction with a highly resilient elastomer core layer standardized so as to be as soft as possible and a thin, top-side covering layer in the form of a smooth fibrous structure. On the side of the sole, a separate supporting layer of flexible, machinable and compression-resistant material may be provided.

Abstract: A vertical-type clothes press, in which clothes such as pants or the like held between a fixed board and a movable board can be pressed for smoothing or creasing, includes a mount base, a fixed board vertically mounted thereon and having a heater, a movable board having a hollow structure for hot-pressing clothes held between itself and the fixed board, a hinge mechanism which rotatably connects the lower ends of the fixed board and the movable board and mounts the movable board openably and closably on the fixed board opposite to each other, a lock mechanism for holding the movable board against the fixed board, a press sheet having one end attached to the connection between the fixed board and the movable board and rotatably provided between the movable board and the fixed board, reinforcements provided along the side end faces of the press sheet in a vertical direction, and a bias device provided on the opposite side of the hinge mechanism for pulling clothes or the like held between the fixed board and th

Abstract: A greeting card with removable bookmark combination comprises a sheet forming at least one leaf, an ornamented, preferably rigid sheet and a connector for removably attaching the ornamented sheet to a leaf of the card without substantially increasing the thickness of the card. Preferably, a threaded loop is wound through perforations in the leaf of the folded sheet and receives an elongated tassel tied to the ornamented rigid sheet forming the bookmark. Alternatively, the bookmark may-be retained in a relatively fixed position with respect to the sheet forming the card by slits within the sheet to form a retainer for the bookmark. The slits may be made in pairs, and multiple pairs may form straps that removably connect the bookmark ornamental indicia to the card leaf.

Abstract: A picture frame is formed from a blank of flexible sheet material, such as paper, which is scored and shaped, to provide, when folded, a central rectilinear base section bounded by straight lines, and peripheral frame sections which are joined to each side of the base section and are folded inwardly and overlap the base section. The frame sections extend from the outer margin of the base section outwardly away from the base section and then inwardly toward the base section. Extension flaps provided at each corner fold downward under pressure of the overlapping frame sections to provide visual closure of the corners. Raised adhesive strips secure the peripheral frame sections to the base section. A photo-receiving slot cut through the base section permits exchanging photographs without requiring any disassembly of the picture frame.

Abstract: An insulated door for use in a refrigerator having an ice and water through the door dispenser is made by attaching a liner for housing the dispenser on the rear face of the door in line with a front opening. The liner is secured to the door as are the hinge bearings and a tube extends between the liner and the lower hinge bearing for conducting electrical wires and a water tube. The only opening in the liner is at a point to receive ice cubes from the dispenser in the refrigerator and this opening is covered prior to foaming. The door is placed in a foaming fixture which completely enclosed and supports the door and the liner and foam is injected so that the foam, when expanded and hardened, completely covers the rear face of the door. After the door is removed from the foaming fixture, the thin layer of foam at the inlet opening is cut away and the door is completed by adding the liner and the gaskets and other hardware as well as the dispensing unit itself.

Abstract: A display supported on the roof comprising a case and a flexible panel. House number indicia is on the panel. The case is connected to the roof of a house structure and the panel is movable from a storage position wherein the panel is disposed in the case to a display position wherein the panel extends a distance from the space so that the house number indicia is observable or visible from a position above the roof.

Abstract: A ski area trail map holder is provided for use with a ski pole. In one form, the holder comprises a tubular housing having a spring biased roller therein. The housing is attachable to the ski pole at any point along the pole. The ski area trail map is releasably secured to a map cover which is extendable from a retracted position in which it is rolled on the roller, to an extended position in which it is outside of the housing. The map cover comprises two transparent sheets, each of which is attached at one end to the roller and each of which has a free end located outside of the housing. A locking mechanism is provided for securing the map cover and/or map in an extended position. In a second embodiment, the ski pole itself acts as the outer housing for the map holder.

Abstract: A miniaturized device adapted to be worn as a piece of jewelry and which contains personal identification and/or medical information about the person wearing the device. The device includes a housing in which first and second panels are hingedly mounted for movement between closed positions stored in the housing and upright exposed positions generally parallel to one another outside the housing at opposite ends thereof. One of the panels carries a piece of microfilm containing the information, and the other panel carries a lens adapted to focus on the microfilm when the panels are in their upright positions outside the housing. The housing includes an openable cover so that the panels are enclosed and protected when the cover is closed. The panels are urged toward their upright positions by spring means when the cover of the housing is opened, and detents formed in the housing engage with the panels to positively hold them in their upright, properly spaced relationship when they are opened for use.

Abstract: A trigger to trigger bar attachment for firearms which includes a single side lug only of the trigger for attachment to the trigger bar, and a shouldered washer and spring, for which the shouldered washer is a spacer and boss.

Abstract: An illuminated gun sight which includes a housing configured for mounting onto a gun and defining a recess having an opening to the exterior of the housing; one or more radioluminous light sources; and apparatus for mounting the one or more radioluminous light sources in the recess so as to expose to a viewer through the opening a predetermined portion of the one or more radioluminous light sources, wherein the recess also has an inward-facing surface having a light reflective coating generally surrounding the one or more radioluminous light sources, the light reflective coating being operative to reflect incident light outwardly through the opening so as to have the appearance in daylight, when viewed from at least a predetermined distance, of a light colored dot, and so as further to have the appearance of an illuminated dot in low light conditions, and wherein the location and size of the illuminated dot are identical to those of the light colored dot.

Abstract: A scent dispenser includes an upper reservoir which holds a liquid scent source and a lower chamber which houses an adjustable burner. The burner emits heat to the upper reservoir and exhausts through a central vent pipe, causing the scent held in the upper chamber to volatilize. Exhaust from the vent pipe entrains volatilized scent and carries it into the atmosphere. A method for dispensing scent is also disclosed.

Abstract: A fishing rod holder is described for supporting a fishing rod and automatically lifting the rod in response to pulling motion on the fishing line carried by the fishing rod. The apparatus includes a hinged tubular receiver for receiving the handle of a fishing rod, an upright stand, a spring connected between the tubular receiver and the stand, an arm which extends forwardly of the stand, a latch attached to the tubular receiver, and a trigger carried on the arm and engaging the latch on the tubular receiver. The sensitivity of the trigger can be adjusted.

Abstract: An adjustable pole rest includes a supporting device which consists of two telescopic rods connected by a connector for supporting a fishing rod, a mounting device fastened to the ground to support the supporting device, a balancing device fastened to the ground to balance the positioning of the mounting device on the ground, and a swivel coupling device connected between the supporting device and the mounting device for permitting the supporting device to be turned horizontally on the mounting device to change the position of the fishing pole.

Abstract: A solid crush-proof hydrodynamic modular plastic double frustum-shaped fishing bobber has two opposing frustum-shaped end sections each with a parallel opposing face. At least two and possibly more opposing frustum-shaped intermediate sections are provided each with two parallel end faces and being of a larger diameter than the end sections. Releasable connecting means are on each face for securing the bobber sections together. Channels and slots may also be provided for connecting the fishing line to the bobber.

Abstract: A rat guard method consists of covering an article to be protected with a sheet made of a flexible material such as a synthetic resin sheet, and covering the sheet with a freely bendable net which is formed by connecting links made of a rigid material such as aluminum freely movably to one another in a two-dimensional pattern, so that the article to be protected can be easily protected from harm by rats.

Abstract: A pesticidal barrier, which may be used as a liner for a building excavation to protect the building to be constructed from infestation by termites and other insect pests, takes the form of a flexible membrane. The membrane comprises an assembly of fibers or filaments. The assembly has an average void volume of less than 85% when measured under a pressure of 10 kPa (1.45 psi). The fibers in the assembly have an average fiber size of less than 6 denier. The assembly integrally incorporates within its structure, or has above or below its structure, an array or network of connected permeable-walled tubes, so that an insecticide may be delivered to all parts of the membrane, particularly after the barrier has been installed at a building site.

Abstract: Biocontrol agents are disseminated for the control of pests using a device which directs a flying insect through a biocontrol agent and out of the device. The device provides separate entry and exit openings which allow the surface contaminated insect to ultimately lethally infect the F.sub.1 larvae.

Abstract: A trap for the extermination of insects and particularly of may-flies (olive fly, domestic fly, cherry fly and Mediterannean fly) comprising a trap bag with an insecticide soaked surface, containing a water or water solution with insect attracting substances, insects being killed as they fall upon the toxic surface of this trap bag. The materials used in manufacturing this trap are such as to allow a slow, continuous and controlled evaporation of the substances contained therein, the service life of the trap bag being extended by periodically adding a water solution of the insect attracting substances.

Abstract: The present invention is a reusable nursery stock container (1) which is designed to receive the root ball directly from the tree diging machine (2) which may be disassembled at the time a plant (3) is transplanted so as to substantially reduce damage to the root ball of the plant. The container(1) is formed of detachable container halves(9,8) which are securely attached to each other to form an integrated container by means of flanges. A bottom member(19) is secured to a bottom region of the container by a shelf(14) which is spaced above the bottom edge of container and held in place by means of tabs (25). The side walls may be tapered to facilitate vertical stacking, and molded in handles(6,7) are formed near an upper region of the container so as to facilitate handling.

Abstract: The present invention provides a protective shroud or cover for young trees or shrubberies. The shroud envelopes the tree via a zipper fastener and firmly secures itself thereon by means of two drawstrings and a fastening strip. The shroud consists of an essentially oval-shaped, protective fabric portion, a zipper fastener disposed on opposing side edges of the fabric portion, two drawstrings, and a lower fastening strip which can be constructed from Velcro.

Abstract: A mechanism for raising and lowering a vehicle window pane by way of a cable attached thereto, can have at least one drive apparatus, a window pane carrier connected to the window pane and a cable guide roller for guiding a closed cable loop. Because of the various loads applied on the different segments of the cable loop of such a system, the cable can have at least two segments whose respective load ratings correspond to the loads on the corresponding segments.

Abstract: A slidable door guard for temporarily bridging covering the opening between a door and a casing, with the door guard having a first engaging or male member and a second receiving or female member having a pocket therein to slidingly hold at least a portion of the male member therein as the door is opened and closed to prevent children from accidently crushing their fingers as the door is closed.

Abstract: A locking mechanism for the contouring head assembly of a belt grinding machine that employs multiple, parallel, abrasive grinding belts, and back-up shoes for pressing the belts against the surfaces on a workpiece to be ground. The locking mechanism secures the contouring head assembly to the bed of the grinding machine. The locking mechanism includes a protrusion, such as a ball, that is carried by the contouring head assembly and a pivotable arm with a socket defined near its free end. The pivotable arm is secured to a shaft that is driven by a rotary actuator, that is powered by a hydraulic motor. The socket engages the protrusion to securely support one side of the contouring feed assembly. A hydraulic cylinder forces a tapered plunger against the pivotable arm to enhance the locking action.

Abstract: A machine for regrinding components of a constant velocity universal joint is disclosed. The machine contains (1) a chuck mechanism and an adaptor for mounting a component in the chuck mechanism, (2) a grinding bit comprised of a grinding tip, an arbor, and means for removably attaching the grinding tip to the arbor, (3) a rotatable support means for supporting the chuck mechanism, (4) a high speed spindle, (5) a means for adjusting the position of the spindle in the Y axis to move the spindle in and out, (6) means for injecting nonaqueous lubricant onto the grinding bit, and (7) means for purifying contaminated nonaqueous lubricant.

Abstract: A rail maintenance vehicle includes a slide frame along which a grinder may move while the vehicle remains stationary. The grinder may be moved automatically away from the rail as the grinder moves longitudinally along the rail away from the center of a weld bead in order to smooth the grinding at the weld bead. The slide frame is connected by a linkage mechanism such that the grinder may be oriented at different grinding angles over a range of 200.degree.. The grinder is mounted upon a lateral displacer such that the grinder may be moved from one side of the vehicle to the other for grinding on rails on either the right or left side of the vehicle. A turntable system allows the turntable cylinder to pivot up and out of the way to a horizontal position so that the lateral displacer may move the grinder from one side of the vehicle to the other without interference from a vertical turntable cylinder.

Abstract: A building (1) or other walled structure has a foundation (6) formed of concrete or the like, a substantially rigid load bearing space frame (2) comprising a plurality of beams (4) and columns (3) secured to the foundation, and lightweight wall panels (5) extending between the columns. The lower edges of the wall panels are located and supported by elongate inserts (12) e.g. angle irons, in channels (11) formed in the foundation, and the upper edges are engaged in downwardly facing channels formed in the beams. In upper stories, the lower edges of wall panels are engaged in upwardly facing channels also formed in the beams.

Abstract: Trim moldings such as crown molding, chair rail molding, base molding and door casing for a building. The trim moldings are made of substantially acrylic or polyester rigid thermoset polymer components. The trim moldings may be manufactured to realistically visually simulate moldings made of natural stone. A method of manufacture of the moldings may utilizes bulk slabs or blocks of rigid thermoset polymer based materials which are then properly shaped for use as a building trim molding with mechanical material removal methods such as sawing, cutting, sanding, and polishing to achieve the desired size, shape and appearance of molding. The thermoset polymer based moldings are structured with grooves in the backside, with the grooves sized and positioned to snap onto spring biased members of mounting fixtures attached to the building for a removable attachment of the moldings.

Abstract: A hand tool for the use in sanding, polishing or finishing of articles of manufacture including wood, plastic and metal articles. A length of abrasive material, such as sandpaper or emery cloth, is secured to the tool with a portion of the length of abrasive material retained in a storage area. The abrasive material is secured to an extended blade which may be sized and shaped as required. The blade may include ridges or nodules to retain the abrasive material in position on the blade while the tool is being used. A securing member slides over the blade and the abrasive material to frictionally secure the abrasive material to the tool. As required, new abrasive material may be pulled from the storage portion and secured to the blade.

Abstract: The present invention relates to a sound and vibration damping device using unit structures comprised of tires, portions of tires or similar elements as far as the shape and absorbing characteristics of the material are concerned, characterized in that said unit structures (1) are arranged in at least one incombustible box (C1) so as to define elementary sound-deadening chambers, said box having a so called "front", wall (6) provided with openings (7) facing a noise source.

Abstract: A wall insert to be affixed within an opening in a vertical wall providing a finished recess for accommodating washer and dryer appliance fittings within the wall dimensions permitting the appliances to be mounted close to the wall. The insert is preferably of a molded synthetic plastic configuration, includes mounting flanges and lips, and an appliance fitting support.

Abstract: A bracing system, useable beneath the habitable structures of mobil homes and manufactured housing to render such structures secure from loss of support due to seismic events, includes a plurality of tubular braces which are connected to chassis beams of the structures and to foundation pads supported at grade at spaced locations below the beams. The braces include pairs of longitudinal beams of fixed length which are pinned at lower ends to the pads and slope in opposite directions upwardly below the adjacent beams to their upper ends. The braces include a telescoping transverse brace pinned at its lower end to a pad and connected to an adjacent beam at its upper end. Each transverse brace is continuously adjustable in length through a selected range of lengths prior to connection between a pad and a laterally adjacent beam, and is fixed at its as-installed length by a pin secured in holes drilled after installation through the concentrically overlapping tubes.

Abstract: A barrier for blocking a passage between adjacent modules of a heat recovery steam generator comprises at least one plate for extending between the modules. At least one bracket is mounted to the plate for engagement with each structure. The bracket has one end engageable with one module and an opposite end engageable with the other module for securing the plate between the modules such that the passage is blocked.

Abstract: A fastening apparatus and method for securely connecting a platform structure to a support element. A non-circular aperture is formed by joining two adjacent holes in an apertured platform structure. A seat element is provided, having a flat portion surrounding an aperture, the aperture in the seat element being configured in substantially the same shape as the non-circular aperture in the platform. A flange extends substantially downward from the rim of the aperture in the seat element. The outer surface of the flange bears against an inner rim of the aperture in the platform structure to prevent relative movement between the seat element and the platform structure. A bolt and nut assembly is inserted through the aperture in the platform and the seat element, through corresponding apertures in the support element, and tightened to securely fasten the platform to the support element in a structure that prevents lateral movement of the platform relative to the support element.

Abstract: A modular construction system includes a plurality of coupled construction modules, with each module having a number of generally upright wall panels interconnected to define an enclosed interior space of preferred dimension. Construction modules are arranged in a vertical stack, with each module having a plurality of floor panels supported by the load bearing wall panels of an underlying module. Each load bearing wall panel is formed of reinforced concrete and has a pair of spaced apart L-shaped support columns. An integral lateral beam extends transversely between the support columns and has a substantially horizontal flange for supporting floor slabs of an overlying construction module. Bottom ends of the columns extend downwardly below the lower edge of the beam to define a narrow elongated trimming, whereby vertical loads associated with a supported overlying structure are transferred solely to the corners of the construction module.

Abstract: A structural framing member having a base and two opposing side walls projecting from the base in a direction approximately perpendicular to the base. Each side wall has an intermediate flange which is approximately parallel to the base and which divides each corresponding side wall into a lower portion and an upper portion. The lower portion is offset from the upper portion by a distance equal to the width of the intermediate flange. A distance between the lower portions of the side wall is greater than a distance between the upper portions of the side wall. Each side wall has an upper flange directed inward toward each other. Each upper flange has a terminal end portion which is angled downward toward the base and is approximately perpendicular to the upper flange. The terminal end portions are spaced apart from each other thereby defining a continuous slot along a longitudinal axis of the structural framing member. Two structural framing members are positioned on opposing sides of a panel.

Abstract: The invention is a support and retainer fixture for hollow fence posts. Angle irons extending up from a bottom plate are oriented with their corners on the inside of the structure and their legs pointed outward. The top ends of the angle irons are cut at a slope with the inside edges being lower than the outside edges. A top plate with a center hole has edges which are bent upward to match the angles formed on the ends of the angle irons and is held in place by a center threaded stud. When a hollow post is slipped down over the assembly and a nut tightened down onto the top plate, the top plate's edges force the top ends of the angle irons out toward the inside surface of the hollow post, locking it in place.

Abstract: A wood post assembly for supporting signs or mail boxes is constructed entirely of wood parts without metal fasteners and without adhesives. It includes a post, cross beam and beam support member. A mortise runs through the post and the cross beam has a tenon extending through the post mortise. A first dowel pin extends through an aperture in the tenon and bears against the rear of the post. The support beam lies against the front face of the post with its upper end supporting the cross beam. A second dowel pin extends through axially aligned apertures drilled through the support member and post. The top surface of the support member has an inclined plane matching that of a recess formed in the lower surface of the cross beam.

Abstract: A method and apparatus for fabricating a drilled, concrete pier in the earth at a construction site is disclosed. The method comprises the steps of providing a template from which vertical reinforcement bars may be suspended and disposed in spatial alignment generally defining the periphery of the reinforcement cage. All the vertical reinforcement bars of the reinforcement cage are suspended in vertical disposition from the template. Horizontal ties are positioned at selected sides along the length of the reinforcement bars, and are fastened to the vertical reinforcement bars at said sites. In this way, fabrication of the reinforcement cage is completed while the cage is vertically suspended from the template. The reinforcement cage can be fabricated and suspended directly above, and later lowered into, a hole drilled in the earth for a drilled pier foundation.

Abstract: An article clip packaging machine for applying carton members to the article rims of preselected article groups. The machine has a conveyor with an infeed end for receiving preselected article groups. At least two carton member feeding structures are synchronized with the conveyor for placing carton base and carton top members, respectively, on the preselected article groups. A securing assembly attaches the carton base and top members to the rims of the article groups to provide article group carriers.

Abstract: A molded suture retainer is provided for retaining and storing sutures. Both absorbable and nonabsorbable sutures fabricated from natural or synthetic materials can be advantageously retained and stored therein. The retainer is characterized by a wide spiraling oval passageway with minimal convolutions covered by a cover sheet. The length of the passageway is preferably proportional to 1/3 to 1/2 the overall length of the suture to be retained therein. Recesses are provided for receiving package stabilizing agents and/or needle parks. Sutures packaged in accordance with the invention exhibit fewer kinks and bends than prior packaged sutures.

Abstract: A packaging machine including packaging apparatus to form a chain of connected packages, a cutting station to separate the packages having a controllable variable speed drive, an accumulator between the packaging apparatus and cutting station to accumulate the chain of packages, and control means to vary the speed of operation of the cutting station in response to the accumulation in the accumulator. The accumulator in its preferred form is a conveyor. A unique control device is provided which receives the completed package chain and delivers it for further processing.

Abstract: A method of cutting pieces of an extruded substance and depositing the pieces on individual wrapping sheets which are being conveyed in the same direction and at the same velocity as the extruded substance is disclosed. The wrapping sheets are fed in an overlapped fashion to the point where the cut off extruded piece is placed onto a wrapping sheet and the conveyor under the sheet onto which the cut piece is being placed is accelerated so that the sheet is disengaged from the overlap with the succeeding sheet immediately before the next cut piece is to be placed onto the next following sheet. An apparatus is disclosed with means necessary for carrying out the method.

Abstract: A cartonizing machine wherein articles are arranged either individually or in groups in trays passing through a feeding station and to and through a loading station wherein the articles on the successive trays are pushed transversely into respective carton members conveyed with a mutual spacing. The filling of the trays is facilitated when the trays are closely juxtaposed with such being achieved by a tray conveyor system disposed so as to operate with a reduced tray pitch and a tray speed in the feeding station.

Abstract: A weed remover for removing weeds and preventing the growth of new weeds on the bed of a body of water. The weed remover comprises a housing a motor, a drive chain, and a roller having a plurality of fins attached thereto. The motor drives the drive chain which in turn rotates the roller. When the roller is rotated, the fins dig into the bed of the body of water, causing the roller to roll along the bed. The housing is attached to a dock such that it can rotate about a generally vertical axis, permitting the roller to roll in an arc. The direction of rotation of the roller can be reversed such that the roller reciprocates over substantially the same path.

Abstract: A method and apparatus for controlling an agricultural harvester having a cut crop receiving header coupled to a hydraulic cylinder. The header applies a force against the ground that is adjusted by applying pressure to the cylinder. A first proportional valve is fluidly coupled to the cylinder, and responds to a first input signal by increasing pressure in the cylinder to a setpoint value, when the pressure is less than the setpoint. A second proportional valve is also fluidly coupled to the cylinder, and responds to a second input signal by reducing pressure in the cylinder to the setpoint pressure value, when the pressure is greater than the setpoint. A pressure signal representing cylinder pressure is received. The difference between the measured pressure and the setpoint is used to compute the first and second input signals, which are transmitted to the valves.

Abstract: An hydraulic elevating mechanism for lifting and lowering an engineering structure which is sluingly supported around a rotational axis on a base unit, has two or more hydraulic lift cylinders pivoted to the base unit at one end and to the engineering structure to be slued at the other. The lift cylinders are controlled by hydraulic control circuits separated from each other and such that at least one of the lift cylinders is connected to a pressure reservoir.