Abstract: A method and an apparatus (1) serve to place tablets (2) into pockets (3) of thermoformed bottom foil (4). The tablets (2) are accumulated as they are located in their flat position. The tablets (2) are rotated in an erecting station (9) such that they reach an approximately upright position. A plurality of lines of approximately upright tablets (2) is formed. The approximately upright tablets (2) are rotated back into their flat position by a transfer unit (24) including a plurality of channels (28). The tablets (2) are then placed into the pockets (3) of the bottom foil (4) by the transfer unit (24).

Abstract: A pencil sharpener includes a frame, a drive mechanism, a transmission mechanism, a cutting mechanism, and a pencil-core adjustment mechanism. The pencil-core adjustment mechanism is constituted of a core stopper shaft, an elastic body, and a core adjustment switch constituted of electrode plates aligned in parallel. A pencil inserted into the cutting mechanism presses against and turns ON a switch provided in the drive mechanism to transmit power from the electric power supply unit to the drive device, thereby operating the cutting mechanism via the transmission mechanism to sharpen the pencil. When the pencil is pressed against the upper end of the core stopper shaft, a disk of the core stopper shaft contacts and pushes down one end of the longer electrode plate to separate the projection of the longer electrode plate from the shorter electrode plate, thereby turning OFF the core adjustment switch.

Abstract: A rotary cutter of a wood planing machine includes: a rotary shaft that has alternately disposed fan-shaped vanes and fan-shaped grooves; and blades secured respectively to the fan-shaped vanes. Each of the fan-shaped vanes has a leading face and a trailing face. Each of the blades is attached securedly to the trailing face of the respective fan-shaped vane. The leading face of each of the fan-shaped vanes and the trailing face of an adjacent one of the fan-shaped vanes converge toward a center portion of the rotary shaft so as to define a respective one of the fan-shaped grooves, and cooperatively define an angle therebetween. The angle is greater than 60 degrees and less than 120 degrees.

Abstract: An apparatus and a tool for chipping material are provided. The apparatus includes chipping tools arranged relative to one another inside a housing, whereby the chipping tools are constructed planiformly, and are arranged on carrier elements along a drum-shaped, disk-shaped, or ring-shaped chipping path. The chipping tools rotate relative to one another by rotating about an axis of rotation, and are each divided by a division line based on their thickness into a core area, which faces the carrier element, and a utilization area, which is positioned opposite of the chipping tools. The chipping tools have at least one bore, formed perpendicular to the division line, the bore extends across the utilization area and ends at the division line between the core area and the utilization area.

Abstract: A log splitter which includes an elongated frame having a reservoir for hydraulic fluid a wedge secured to one end of the frame and a hydraulic cylinder and ram/piston secured to the other end of the frame. The ram/piston being movable toward and away from the wedge. The reservoir includes an inlet and outlet and a discharge tube associated with the inlet or outlet and having a length effective to discharge incoming fluid into the reservoir at a position remote from the inlet to prevent short circuiting. A log splitter and arm for mounting the splitter to a vehicle having a hitch style receiver secured to the rear of the vehicle. The splitter is adapted to be secured to an elongated arm and supported above the ground. The splitter's linear working action is substantially normal to the vehicle's direction of movement.

Abstract: An apparatus for identifying, tracking and handling lumber to be cut-in-two includes a scanner and optimizer to scan the length of a board and to compare the scanned board to predetermined criteria so as to identify a board which, optimally, would be cut into two pieces along its length. An identification device applies a detectable indicator to the board. A transfer transfers in a downstream direction, the board from the scanner to the identification device, and from the identification device to a lug-loader loading device adjacent and immediately upstream of a lug loader. A detector cooperates with the lug-loader loading device so as to detect the detectable indicator on the board and to delay the loading of the lug loader following loading of the board into a lug space so that an immediately subsequent lug space behind and upstream of the board is left empty so as to receive a portion of the board cut from the board once the board is cut-in-two in a downstream trimmer or other sawing device.

Abstract: The present invention relates to crosslinked rubber particles modified by secondary amino-(meth)-acrylate groups, a process for their production, their use for the production of rubber vulcanizates or rubber molded bodies of all kinds and also the rubber vulcanizates or rubber molded bodies that can be obtained from the rubber particles.

Abstract: A pneumatic off-the-road (OTR) tire has a plurality of central and shoulder lugs. The central lugs are arranged in a circumferentially continuous row and extend across the equatorial plane (EP). Each central lug is similar in shape and orientation relative to each circumferentially adjacent central lug. The tire is conformed having a tread package that effects a low net-to-gross ratio of less than 40% as measured around the circumference of the tire. The low net to gross tread pattern is incorporated into a relatively low aspect ratio OTR tire for construction and industrial applications.

Abstract: The present invention relates to a pneumatic rubber tire having an integral innerliner of a sulfur cured rubber composition. The innerliner rubber composition is comprised of at least one elastomer selected from bromobutyl rubber and chlorobutyl rubber which also contains a dispersion therein of corncob granules.

Abstract: A system for mounting a covering for an architectural opening in the architectural opening includes a bracket in which an edge of the headrail for the covering can be inserted and a releasable locking system operative with a slide member to securely lock the headrail to the bracket in one position and allow the headrail to be easily removed from the bracket in a different position of the slide.

Abstract: A window cover support device and method of use thereon, wherein the device is non-rotating and comprises a bracket having support members in the form of pairs of upward-facing hooks over which a valance rod or curtain rod may be placed, a box structure for confinement of one end of a miniblind support rod, and also a round or rectangular slotted opening for installation of one end of a shade support rod therein. The bracket is utilized in pairs with a tension rod between same to provide support to the selected window cover or combination of window covers. In furtherance of adhesion to the wall, the present invention incorporates a novel plug-flap device of rubber, or other similar material, suitable for insertion into the end of the tension rod, the plug-flap device providing a large surface area of rubber or similar material under the bracket.

Abstract: A sectional door (20) having a plurality of panels (21)joined for moving between open and closed positions of the door and having pinch resistant panel-to-panel interfaces (41), said panels having a body portion (21?) spacing said interfaces, an inner surface (23) and an outer surface (22) of said body portion, and decorative components (31, 32) arranged in a patterned design upon said outer surface of said body portion, said decorative components being positioned on said panels proximate to said panel-to-panel interfaces and attached to said panels for movement of said decorative components to provide a pinch resistant interface between decorative components on adjacent of said panels.

Abstract: A sectional door (20) having a plurality of panels (21) joined for moving between open and closed positions of the door and having pinch resistant panel-to-panel interfaces (41), said panels having a body portion (21?) spacing said interfaces, an inner surface (23) and an outer surface (22) of said body portion, and decorative components (31, 32) arranged in a patterned design upon said outer surface of said body portion, said decorative components being positioned on said panels proximate to said panel-to-panel interfaces and having portions that releasably engage said panels to provide a pinch resistant interface between decorative components on adjacent of said panels.

Abstract: A roller tube support mechanism includes a roller tube including a roller tube body. The roller tube is configured to support a sheet material wound around the roller tube body along a length of the roller tube body between a first end and a second end of the roller tube body. An assembly includes a first mount and a second mount opposite the first mount. The assembly is configured to support the roller tube rotatably coupled to the first mount and the second mount. A support cradle is coupled to the assembly between the first mount and the second mount. The support cradle is configured to support the roller tube along the length of the roller tube.

Abstract: The invention concerns an elastic coupling device comprising a first cylindrical part (46), a second cylindrical part (47), at least partly tubular and enclosing the first part with its tubular part and provided with internal teeth (9), at least an elastic means (12) mounted inside the first part in a housing (11) and operating in substantially radial compression, at least a pinion (7) mounted in the first part and meshing with the teeth of the second part to drive a compression means (5) for the elastic means, the compression means consisting advantageously of a clamp. Said construction is particularly compact. Said device combined with rotation detecting means can constitute a torque sensor.

Abstract: An investment casting pattern is formed by forming a metallic first core element including at least one recess. The first core element is engaged to at least a mating one of an element of the die and a second core element. The recess serves to retain the first core element relative to the mating one. The die is assembled and a sacrificial material is introduced to the die to at least partially embed the first core element. The recess may be pre-formed prior to cutting the first core element from a larger sheet of material.

Abstract: A process for the production of a braking band having ventilation ducts comprises the steps of a) moulding a core of metallic material, b) inserting the core in a mould, in a central position, c) filling the mould with at least two layers of material which are to form the braking band, in a manner such that the core is “sandwiched” between the at least two layers, d) performing a first heating of the mould to a temperature such as to bring about hardening of the at least two layers until the at least two layers adopt a three-dimensional structure, e) subjecting the semi-finished product produced in step d) to a second heating to a temperature such as to bring about fusion of the metallic material of the core, and f) collecting the molten core.

Abstract: Process of making a lightweight part comprising an inner core including a metal foam, a dense core surface layer that is metallically joined to the inner core, and an outer wall comprising an essentially pore-free cast metal layer that is at least one of positively engaged with the dense core surface layer and surrounding the inner core and metallically joined to the dense core surface layer and surrounding the inner core, wherein the process includes creating a core part by forming the dense core surface layer, forming the inner core of a metal foam, and metallically joining together the inner core and the dense core surface layer and creating a finished part by positioning the core part in a casting mold, feeding a melt material into the casting mold, and allowing the melt material to solidify so as to form the outer wall. This abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: A method of die casting spheroidal graphite cast iron able to prevent formation of chill crystals to allow the crystallization of fine spheroidal graphite and simultaneously prevent the formation of internal defects, including the steps of preparing a die formed with a heat insulation layer at inside walls of a cavity, filling molten metal having a composition of the spheroidal graphite cast iron through a runner into the cavity, closing the runner so as to seal the cavity right before the molten metal in the cavity starts to solidify, and allowing the molten metal to solidify by the action of the inside pressure caused by crystallization of the spheroidal graphite in the sealed cavity.

Abstract: A process for counter gravity sand casting including providing precision cores in a sand mould supported in a casting machine for rotation about a horizontal axis through the center of the mould, providing primary casting risers fed by a launder section, a pressure riser connected to the launder section and the primary risers, rising upwardly beside the mould, whereby on rotation a the molten metal in the pressure riser will maintain a internal constant pressure in the mould until the casting risers are upper most, so as to maintain the internal pressure during the cooling of the mould.

Abstract: In a filling-tube construction (1, 2) for providing a connection between a mould (6) to be filled with molten metal and a mould-filling furnace (3) containing molten metal (5), said mould (6) having at least one casting cavity (7), the lowermost part of each such cavity communicating with a filling duct (8), at least one end of which is open to the outside of said mould (6) and adapted to be temporarily connected to the filling-tube construction (1, 2) to receive molten metal (5) from the mould-filling furnace (3), the mould-filling furnace being adapted to contain molten metal (5) and to transfer said molten metal (5) under a controlled pressure through the filling-tube construction (1, 2) and to the filling duct (8), the filling-tube construction comprises a first section (1) extending from a position close to the bottom of said mould-filling furnace (3) up to an intermediate position closer to the filling duct (8) and at least one separate second section (2) providing a connection from the upper end of the

Abstract: A casting roll unit (U) with side weirs (6) and a delivery nozzle (8) being detachably attached thereto is fixed at a casting position. Side-weir and delivery-nozzle preheating furnaces (29, 30) are arranged away from the casting roll unit (U). Arranged adjacent to the roll unit (U) are replacing robots (31, 32) which can selectively clamp the side weirs (6) or the delivery nozzle or nozzles (8) and which can move between the roll unit (U) and the side-weir or delivery-nozzle preheating furnace (29 or 30) for installation/removal of the side weirs (6) or delivery nozzle or nozzles (8).

Abstract: Reinforced moulds for a casting machine include a wall for containing a cast article, the wall including a lip region. The lip region includes a reinforcing element cast internally in the lip region. The reinforcing element provides enhanced resistance to tensile tearing and cracking of the moulds. Methods of making and using the reinforced moulds also are provided.

Abstract: A heat exchanger having an air/air heat exchanger, an air/refrigerant heat exchanger coupled to the air/air heat exchanger by a connecting tube, and a phase change material. The air/refrigerant heat exchanger having a series of stacked plates, such that the phase change material is contained within a first gap between one of the stacked plates and another of the stacked plates.

Abstract: A two loop heat conversion system for high heat density planar devices in which high density heat in an area adjacent to a surface is transferred into a liquid cooling medium closed loop in a radiated heat to liquid heat transfer component positioned in contact with the surface that is connected, to a liquid to gas medium, heat exchanger in a first loop and a gas medium second loop is arranged to carry away all radiated heat from the assembly and all heat extracted from the liquid in the liquid to gas heat exchanger and exhaust it to the ambient. The radiated heat transfer component of the invention provides a transition in manufacturing that is practiced employing the planar type tools in fabrication which usually can neither be practiced manually or observed without substantial magnification.

Abstract: A composite wick structure of a heat pipe which is applied with a tube circumferential surface contacted to a heat source includes a plurality of grooves and a sintered-powder layer. The circular grooves are formed on the internal sidewall of the tubular member. The sintered-powder layer filled in the grooves is attached to at least a portion of the internal sidewall of the tubular member. By the better capillary force provided by the sintered powder, the liquid-phase working fluid can reflow to the bottom side of the heat pipe quickly to enhance the heat transmission efficiency. Further, the problem caused by usage of an axial rod during the process of applying sintered powder can be resolved.

Abstract: Apparatus and methods according to the present invention preferably utilize electroosmotic pumps that are capable of generating high pressure and flow without moving mechanical parts and the associated generation of unacceptable electrical and acoustic noise, as well as the associated reduction in reliability. These electroosmotic pumps are preferably fabricated with materials and structures that improve performance, efficiency, and reduce weight and manufacturing cost relative to presently available micropumps. These electroosmotic pumps also preferably allow for control including venting or recapture of evolved gases and deposited materials, which may provide for long-term closed-loop operation. A gas permeable membrane removes and vents electrolytic gasses generated within the fluid chamber of the electroosmotic pump to ambient. A catalyst can be used to recombine electrolytic gases to form a vapor product that can be vented or condensed into a liquid state.

Abstract: In a vehicle air conditioner, a foot door is rotatably supported for opening and closing a foot opening and an air port communicating with defrost and face openings. The foot door has a guide plate. The guide plate functions as a heated air guide portion for directing heated air heated by a heating device to merge with cooled air that bypasses the heating device when the foot door is at a defrost/face mode position. The guide plate functions as a cooled air guide portion for directing the cooled air to merge with the heated air when the foot door is at a foot mode position. Accordingly, the heated air and the cooled air are sufficiently mixed with each other. Because the guide plate is moved for switching the defrost/face mode position and the foot mode position, the flow of air is not blocked by the guide plate.

Abstract: An isolation assembly for use with coiled tubing is described. The isolation assembly has a check valve for providing selective fluid communication through from the coiled tubing, through the isolation assembly, and into a downhole tool, such a straddle packer. The isolation assembly includes a shuttle moveable within a housing, and plurality of ports to selectively provide fluid communication from within the isolation assembly below the check valve, through the ports, and into the annulus, thus allowing selective surface-controlled equalization of downhole equipment. Also described is a bottom hole assembly including the isolation assembly. An improved method of fracing a formation includes providing a check valve, thus improving the life of the coiled tubing and the safety of the operation, and reducing the time to perform a given downhole operation.

Abstract: A drilling system is provided for drilling a borehole into an earth formation, the drilling system comprising pump means for pumping drilling fluid into the borehole and discharge means for discharging drilling fluid from the borehole. The discharge means comprises at least one pressure chamber for temporarily accommodating drilling fluid being discharged from the borehole, and control means for controlling the fluid inflow into each pressure chamber.

Abstract: A wellhead hanger system that allows the use of either of two casing hangers depending upon whether the casing string to be suspended becomes stuck during installation and cannot be lowered to its expected depth is disclosed. A full bore test plug for use with the system is disclosed also.

Abstract: The present invention provides a method for remedying minute seal leaks in downhole tools and equipment. The various embodiments of the present invention utilize pressure activated liquid sealants stored in local reservoirs to remedy such leaks.

Abstract: Hydraulic fracture dimensions and, optionally, fracture closure pressure and time are determined by adding particulate matter that discharges to create an acoustic signal to the proppant, allowing the particulate matter to discharge, and detecting the acoustic signal with geophones or accelerometers. The particulate matter may be spheres or fibers. The discharge may be explosion, implosion, detonation, or rapid combustion or ignition. The discharge may be triggered by fracture closure or by chemical reaction.

Abstract: A logging system that may be used in a wellbore formed in an earth. A tubular conduit extends from surface into the wellbore and contains a body of wellbore fluid. A logging tool string may be passed from a position within the conduit to a position outside the conduit at a lower end part thereof, and may be suspended by the conduit in the position outside the conduit. A pressure pulse device is arranged within the conduit in a manner that the pressure pulse device is in data communication with the logging tool. The pressure pulse device is capable of generating pressure pulses in the body of wellbore fluid, which pressure pulses represent data communicated by the logging tool string to the pressure pulse device during logging of earth formation by the logging tool string. The system further includes a control system in fluid communication with the body of wellbore fluid and arranged to receive the pressure pulses.

Abstract: A method for recirculating fluid in a well system includes drilling a first well bore from a surface to a subterranean zone, and drilling an articulated well bore that is horizontally offset from the first well bore at the surface and that intersects the first well bore at a junction proximate the subterranean zone. The method also includes drilling a drainage bore from the junction into the subterranean zone, and receiving gas, water and particles produced from the subterranean zone at the junction via the drainage bore. The gas, water, and particles are received from the junction at the surface, and the water is separated from the gas and the particles. The method also includes determining an amount of water to circulate, and recirculating a portion of the separated water according to this determination.

Abstract: A casing liner and method for lining a casing affixed in a well bore. The casing liner having a plurality of grooves and ridges arranged longitudinally and in an alternating relationship about the exterior surface of the casing liner to increase stress storage upon the casing liner being radially reduced in size and thereby decrease the expansion rate of the casing liner and facilitate installation of the casing liner into the casing.

Abstract: Single phase microemulsions improve the removal of filter cakes formed during drilling with invert emulsions. The single phase microemulsion removes oil and solids from the deposited filter cake. Optionally, an acid capable of solubilizing the filter cake bridging particles may also be used with the microemulsion. In one non-limiting embodiment the acid may be a polyamino carboxylic acid. Skin damage removal from internal and external filter cake deposition can be reduced.

Abstract: Foamed treatment fluids comprising water, a gas, and a foaming and foam stabilizing surfactant mixture comprising an alkali salt of an alkyl ether sulfate, wherein the alkali salt of the alkyl ether sulfate comprises an alkali salt of a C6-10 alkyl ether sulfate, and an alkali salt of a C4 alkyl ether sulfate, an alkyl amidopropyl amphoteric surfactant selected from the group consisting of an alkyl amidopropyl hydroxysultaine, an alkyl amidopropyl betaine, and combinations thereof, and an alkyl amidopropyl dimethylamine oxide. Methods comprising providing the foamed treatment fluid and introducing the foamed treatment fluid into a subterranean formation.

Abstract: A system for use in down hole operations, the system comprising a wellhead; a BOP ram package connected at one end to the wellhead and having an axial bore extending from the wellhead to the other end; a device above the other end of the BOP ram package for isolating the pressure of the wellhead; a fluid take off between the pressure containing means and the BOP ram package; a separator in communication with the fluid take of such that, in use, a multi-phase medium obtained from the well can be separated into its constituent phases; and a pressure control device on each of one or more outlets from the separator for allowing the system to be operated at different wellhead pressures.

Abstract: A well pumping system has a downhole rotary pump that drives a downhole reciprocating pump. The reciprocating pump is an intensifier, having a primary piston and a secondary piston of lesser diameter. A sequencing valve connects between the discharge of the rotary pump and the primary cylinder for alternately supplying well fluid from the rotary pump to the primary piston to stroke the primary and secondary pistons. The secondary piston pumps well fluid to the surface.

Abstract: A method for characterizing formation fluid using flowline viscosity and density data in an oil-based mud environment includes: making an initial estimate of the density and viscosity of the individual components of the sampled fluid; measuring the volume fractions, density, and viscosity of the total mixture of formation fluid; computing the density and viscosity of the total mixture using the estimate and the measured volume fractions; comparing the computed values with the measured values; and updating the estimate based on the comparison until convergence. The process is repeated as additional data are acquired until the converged computed values differ only by an acceptable amount.

Abstract: A particulate screen suitable for use in a wellbore. The particulate screen is expandable and may be at least partially formed of a bistable tubular. Also, a filter media may be combined with the bistable tubular to limit influx of particulates.

Abstract: A well bore fluid recovery system and method for recovering a column of well bore fluid within a stand of casing before cutting the casing. The recovery system relates to a system for preventing fluids from being spilled when casing is being finished for a well bore. After being run the casing must be cut and finished at an appropriate level to install rig equipment such as blow out preventers along with other equipment. However, because of earlier operations, the entire length of casing is typically filled with drilling fluid. Depending on conditions, the length of casing which is to be cut and removed may therefore over a 100-foot (27.4 meter) column of drilling fluid therein. The drilling fluid in this section must be properly drained before the casing is cut and removed.

Abstract: The wellbore pump of the present invention comprises a plunger having passage means which may be open or closed by a valve operated by a piston which is biased in the open position by a spring of selected strength such that the wellbore pressure may overcome the spring to close the valve when the accumulated hydrostatic pressure reaches a certain value. When the valve closes the reservoir pressure forces the plunger to the surface and causes the accumulated liquids to be pumped out of the wellbore. A stem extending from the top of the piston engages a top plate and causes the valve to open when the plunger reaches the top of the wellbore. Means is provided whereby the valve opens when it reaches the top of the wellbore and a latch may be provided to retain the plunger from returning to the bottom of the well.

Abstract: An expandable packer or anchor is disclosed. It features a gripping device integral to or mounted in a sleeve over the mandrel. Upon expansion, a sealing element engages an outer tubular and the gripping device, such as wickers on slips, preferably digs into the outer tubular. The expansion is preferably by pressure and can incorporate pressure intensifiers delivered by slick line or wire line. Release is accomplished by a release tool, which is delivered on slick line or wire line. It stretches the anchor or packer longitudinally, getting it to retract radially, for release. The release tool can be combined with packers or anchors that have a thin walled feature in the mandrel, to release by pulling the mandrel apart.

Abstract: A tubing string assembly is disclosed for fluid treatment of a wellbore. The tubing string can be used for staged wellbore fluid treatment where a selected segment of the wellbore is treated, while other segments are sealed off. The tubing string can also be used where a ported tubing string is required to be run in in a pressure tight condition and later is needed to be in an open-port condition.

Abstract: A deformable member can be used in a well tool for use in downhole oil/gas wells. In one embodiment, a deformable member (46) is described which is deformable between undeformed and deformed positions, and comprises a generally hollow cylindrical body (48) defining a wall (50). The wall (50) includes three circumferential lines of weakness in the form of grooves, with two grooves (52, 54) provided in an outer surface (56) of the member wall (50), and the other groove (58) provided in an inner surface (60). The member (46) is deformed outwardly by folding about the lines of weakness (52, 54, 56) and is used in particular to obtain sealing contact with a tube in which the member (46) is located.

Abstract: A method of detecting the actuation of a sprinkler involves sensing a first fluid pressure at a first flow cross section, in one of the sprinkler and a conduit in which the sprinkler is mounted, sensing a second fluid pressure at a second flow cross section, in the sprinkler, wherein said first flow cross section is larger than said second flow cross section, and comparing the fluid pressures sensed at the first and second flow cross sections in order to detect a change in the relation of the fluid pressures due to actuation of the sprinkler, and thereby detect actuation of the sprinkler. The fluid pressures are sensed by ports in the sprinkler, or by one port in the sprinkler and one port in the conduit, and at least one transducer connected to the ports, and output signals from the transducer are sent to a computer or other recording instrument.

Abstract: A preferred embodiment of a rotary tool reciprocating motion conversion attachment for a rotary power hand tool is described which is configured to be attached to a nose portion of the hand tool housing. The attachment has a rotary drive train in a housing that is connectable to the output shaft of the hand tool, the drive train driving a barrel cam having an exterior cam groove. A cam follower rides in the cam groove and produces reciprocating motion, with the cam follower being part of a cam follower assembly to which an implement holder is attached. The preferred embodiment has a cam groove configuration which causes the implement holder to move slower during a cutting stroke and faster during a return stroke, thereby tending to optimize the operation of the cutting implement. The preferred embodiment also includes a planetary gear set for reducing the rotational speed of the hand tool output shaft to reduce the speed of reciprocation of the attachment.

Abstract: A portable power tool is provided which includes a rotation motor (11), an output shaft (14), a gearing (13) and a drive spindle (12; 112) connecting the gearing (13) to the motor (11). A drive line arresting lock device (17; 117) is provided to facilitate loosening and/or tightening of a working implement mounting device (15), and a releasable safety clutch (23; 123) is provided between the lock device (17; 117) and the gearing (13) for protecting the gearing (13) against transmission of detrimental excessive torque magnitudes manually applied on the output shaft/mounting device (14, 15).