Abstract: An auto changeover mechanism for a thermostat. A heat and cool mode auto changeover with single or crossed setpoints may be an approach for doing a single setpoint auto changeover, an approach that can handle auto changeover with separate heat and cool setpoints that do not require the cool setpoint to always be higher than the heat setpoint, and also an approach that does not necessarily require a dead band between the setpoints. A hysteresis may be associated with switching to the other mode. The thermostat having the auto changeover mechanism may have a display of a mode that automatically changes between heat and cool.

Abstract: Disclosed herein is a hybrid ventilation apparatus capable of both natural and forced ventilation. In the case of a natural ventilation mode, a worm gear is rotated in a normal direction by drive force of a drive unit under control of a control unit so that a pressing member engages with a rotation guide protrusion and rotates a damper, thus opening a flow passage, and then the worm gear is reversely rotated by drive force of the drive unit to return the pressing member to its original position, thus allowing a user to rotate a roller upwards and downwards and rotate the damper so that the degree of opening of the flow passage can be adjusted. Thereby, rapid inflow of outdoor air can be blocked, and a cold graft phenomenon, in which the temperature of indoor air rapidly drops, can be prevented.

Abstract: A comfort control system includes a user-end subsystem and a system-end subsystem. The user-end subsystem includes an environmental control device, a sensor and a communication apparatus. The environmental control device adjusts an environmental factor value of a predetermined area. The sensor senses an activity value of a user. The communication apparatus sends the activity value and an identifier corresponding to the user. The system-end subsystem includes a communication element, a comfort database and a computing apparatus. The communication element receives the identifier and the activity value. The comfort database includes a basic data table having a physiological value and a preference data table having a control parameter. The computing apparatus looks up the basic data table for the physiological value and looks up the preference data table for a corresponding control parameter. The computing apparatus controls the environmental control device to adjust the environmental factor value.

Abstract: An apparatus for monitoring a heating, ventilation, or air conditioning (HVAC) system includes an indoor unit monitor module electrically connected to a current sensor and first and second refrigerant temperature sensors. The current sensor generates a first current signal based on aggregate current consumed by components of an indoor unit of the HVAC system. The refrigerant temperature sensors generate first and second refrigerant temperature signals, respectively, based on measured temperatures of refrigerant circulating within the HVAC system. The indoor unit monitor module receives, from a secondary monitoring module, a second current signal based on aggregate current consumed by components of an outdoor unit of the HVAC system. The indoor unit monitor module transmits data to a remote server to assess whether a failure has occurred or is likely to occur in the components of the HVAC system. The data is based on the current signals and the refrigerant temperature signals.

Abstract: A clamp assembly is provided for use in a duct system. The clamp assembly includes a clamp member including a base portion and first and second lateral portions. The first and second lateral portions extend less than the full circumferential length of the base portion. The clamp assembly may include a first member, a second member, and a hinge operatively coupling the first member to the second member. A damper access assembly includes an adapter, a damper access duct section, and an annular clamp member. A first flange of the adapter and a second flange of the duct section are configured to form a generally T-shaped joint between the adapter and the damper access duct section. The clamp member is configured to removably secure the adapter to the damper access duct section. The damper access duct section is configured to be removable relative to the damper enclosure and the ductwork.

Abstract: Disclosed is a device capable of retaining water in a water heater during the course of changing out the heating element. The device is comprised of a series of parts that fit together in such a way as to allow for a heating element insertion and removal without draining of water from the water heater. Because of the relationship between tubes 4 and 7, and bushings 3 and 5 (teflon, aluminum, or any suitable metal or material) and the threaded piece 1 and heating element tip, screwing in clockwise heating element allows for alignment of these components (tube 4 with slots to align with tube 7 and its slots); slots will be aligned so that water flows through. The heating element is in fluid contact with the water of the water heater. However, unscrewing counter-clockwise the heating element rotates these components in such a fashion as to block the slots in tubes 4 and 7 and the threaded element 1 in order to contain the water of the water heater while the heating element is exchanged for a new one.

Abstract: A solar radiation absorber element for a thermal concentrating solar power plant is achieved by forming a selective coating on an outer surface of a substrate made from stainless steel, chosen from stainless steels presenting an aluminum content of more than 0.5% by weight. Formation of the selective coating includes a surface treatment step of the substrate, by polishing, and a heat treatment step of the substrate, in an oxidizing atmosphere, in a temperature range included between 550° C. and 650° C. The heat treatment in particular enables at least one intrinsically selective superficial thin layer to be formed on the outer surface of the substrate.

Abstract: A ground mounted solar power assembly having at least one solar panel having a support beam connected to the back of the solar panel. A plurality of legs have a bracket at one end that receive the support beam. Finally, an eccentric handle is connected to the bracket to permit selective rotation of the support beam within the bracket.

Abstract: A number of apparatuses and methods for fastening roofing straps and structural members to roofs are disclosed.

Abstract: Described herein is a mounting system and slider clips that support simplified installation of photovoltaic structures. The mounting system comprises a support structure which can be mounted to support columns via an optional tilt table. The support structure comprises a plurality of parallel spaced beams and a plurality of parallel spaced rails that are mounted approximately perpendicular to the beams. Disclosed embodiments describe a collapsible support structure in which the rails are pivotally mounted to the beams. Rails are preassembled with prefabricated slider clips for holding edge portions of the photovoltaic structures. Rails can also be integrally formed with slider clips. Described herein are also methods of installing one or more photovoltaic structures using the mounting system and methods for manufacturing slider clips and a photovoltaic structure mounting system.

Abstract: An ejector (38) has ports (40, 42, 44) for receiving a motive flow and a suction flow and discharging a combined flow. The ejector has a motive flow inlet, a suction flow inlet (42), and an outlet (44). A suction flow flowpath extends from the suction flow inlet. A motive flow flowpath extends from the motive flow inlet to join the suction flow flowpath and form a combined flowpath exiting the outlet. The ejector comprises a plurality of motive flow nozzles (100, 302, 402, 602, 702, 802) along the motive flow flowpath. The motive flow nozzles are oriented to impart a tangential velocity component to the motive flow. A plurality of diffusers (130, 304, 404, 604, 704, 804) are along the combined flowpath and are oriented to recover the tangential velocity from the combined flow.

Abstract: An air conditioning system, including a condenser for condensing a refrigerant, a first expansion device for throttling the refrigerant passed through the condenser, a second expansion device for throttling the refrigerant passed through the first expansion device, an evaporator for evaporating the refrigerant passed through the second expansion device, a compressor for compressing the refrigerant passed through the evaporator and the refrigerant injected after branched between the first expansion device and the second expansion device, and a control unit for detecting a value of at least one operating parameter and determining a target opening degree of the first expansion device on the basis of a stored set value corresponding to the detected value of the operating parameter.

Abstract: Components within a cryocooler are scaled and/or configured for operation at a CMG operating frequency (e.g., 100 Hz) rather than at 30 to 70 Hz, matching the exported disturbances of control moment gyroscopes on the same platform and reducing line-of-sight jitter for electro-optic infrared focal plane array sensors. The smaller piston working volume and other reduced component sizes allow the cryocooler to be smaller and lighter than designs operating at lower frequencies. Combined with an advanced regenerator suitable for the higher frequency operation, the cryocooler has improved cooling efficiency over such lower frequency designs.

Abstract: A heating and cooling system for use in high-rise residential and commercial buildings may include condensing unit having dimensions no greater than 12 inches deep by 40 inches wide by 20 inches tall and a fan coil unit coupled to the condensing unit via refrigeration tubing. The fan coil unit may have dimensions of no greater than 14 inches deep by 43 inches wide by 11 inches tall. The condensing unit may include a condenser water connection, a refrigeration tubing connection, a compressor, and a heat exchanger. The fan coil unit may include a filter rack configured to hold a MERV 13 filter, two in-line high-pressure fans, and at least one access panel on a bottom surface of the fan coil unit.

Abstract: There is provided a refrigeration cycle apparatus in which an outdoor heat source unit, an indoor unit, and a water heating unit are connected, and an air conditioning operation and a water heating operation can be performed separately, and an exhaust-heat recovery operation can be performed by simultaneously performing air cooling and water heating. The outdoor heat source unit includes a compressor for compressing refrigerant, a refrigerant air-heat exchanger that performs heat exchange between the refrigerant and outside air, a fan for cooling the refrigerant air-heat exchanger, a control device that includes an inverter device for driving the compressor, and a heat sink for dissipating heat of the inverter device, and a switching element in the inverter device is constituted by an element formed by a wide bandgap semiconductor.

Abstract: The invention relates to a compressor-heat exchanger unit for a heating-cooling module for a motor vehicle, in which at least one fluid serving as a coolant flows, comprising a compressor device for compressing the first fluid, at least one heat exchanger device that has at least one first circuit for the first fluid to flow through and a second circuit for a second fluid to flow through, this heat exchanger unit being arranged in the fluid stream after the compressor device, characterized in that the first fluid is guided at least partially in flow channels of the first circuit that at least partially enclose the compressor device.

Abstract: A refrigeration cycle apparatus includes a controller configured to control opening and closing of a solenoid valve and that of a solenoid valve depending on any of a time when a compressor is activated, a time when the compressor is in normal operation, a time when a temperature of a motor of the compressor rises in the normal operation, and a time when the compressor stopped due to low-pressure cutoff is activated.

Abstract: A first expansion valve is provided in a first refrigerant circulation passage through which the refrigerant discharged from a compressor is able to circulate by passing sequentially through an external heat exchanger and an evaporator and returning to the compressor. A second expansion valve is provided in a second refrigerant circulation passage through which the refrigerant discharged from the compressor is able to circulate by passing sequentially through an auxiliary condenser and the external heat exchanger and returning to the compressor. The second expansion valve regulates the valve opening degree such that the refrigerant state at an inlet side of the compressor during a heating operation is in a range where the dryness of refrigerant is greater than or equal to 0.9 and the superheat of refrigerant is less than or equal to 5° C.

Abstract: A two chamber heat transfer unit configured such that hazardous air can circulate through one of the chambers and potential ignition source components are contained in another chamber through which the gas to be heated or cooled will circulate.

Abstract: A two chamber heat transfer unit configured such that hazardous air can circulate through one of the chambers of the heat transfer unit and any potential ignition source components are contained in another pressurized chamber of the heat transfer unit.

Abstract: An ice making apparatus for an appliance comprising an ice making tray having at least one specialty feature chosen from the group consisting of: a convex bottom surface, a ledge disposed about a perimeter of the at least one ice compartment and proximate a bottom portion of the at least one ice compartment, at least one thread extending from one corner of the at least one ice compartment to another corner of the at least one ice compartment, or any combination thereof.

Abstract: Self-cooling compositions and systems adapted to rapidly chill a substance in a compact container are provided. In some implementations, the composition comprises an aqueous solution and solid chemical reactants, wherein at least one solid chemical reactant is selected independently from the group consisting of NH4NO3, urea, and mixtures thereof; and a second solid chemical reactant is selected independently from the group consisting of NH4Cl, calcium sulfate, borax, phosphates, MgCl2, carrageenan, and mixtures thereof. The self-cooling compositions and systems can have a wide range of applications such as cooling comestibles or medical assay kits.

Abstract: A method for controlling evaporator defrost in a refrigeration appliance having a cooling circuit with a variable cooling capacity compressor is disclosed. The method includes assessing the cooling capacity of the cooling circuit and calculating the defrost time on the basis of such cooling capacity. Defrost time is preferably assessed on the basis of the inverter frequency driving the compressor and/or the percentage of insertion of the compressor.

Abstract: A liner for an appliance is formed by a plastic sheet formed into a three dimensional shape corresponding to at least a portion of a compartment of the appliance. A plurality of electrically conductive ink pathways are applied on a surface of the plastic sheet, and a sealer material is applied to the plastic sheet to cover said pathways.

Abstract: A shocking cooler includes an ice chest cooler which has a lid and lower portion. A first conductor is located within the bottom portion and extrudes from one of the side interior surfaces of the ice chest cooler. A second conductor is located near a lower lip region, and is separated a distance from the first conductor. The first conductor and second conductor are joined to a power supply at alternate connections (either positive (+) or negative (?)) by connection cable(s). The power supply is connected to a switch, which allows the shocking ice chest cooler to be turned on or off. Water is introduced to the ice chest cooler, and is in contact with the first conductor. When a burglar attempts to reach into the ice chest cooler, his hand is immersed into the water, thereby completing the circuit and issuing an electrical shock.

Abstract: A refining system for refining a feed gas (10) includes a first and a second component, the first component having a lower dew point temperature than the second component; the refining system including:—an input section (105) for input of the feed gas including a dehydration unit for dehydrating the feed gas, capable of obtaining a water dew point between ?45 and ?65° C.;—a pre-cooling section (110) coupled to the input section for receiving the dehydrated feed gas;—a fractionation section (115) coupled to the pre-cooling section for receiving the pre-cooled stream;—an expansion cooling and separation section (120) coupled to the fractionation section for receiving the fractionated gas, including a cyclonic separator device (240); the expansion cooling and separation section having an reflux conduit coupled to the fractionation section for reflux (24) of liquid enriched with the second component to the fractionation section.

Abstract: Methods and apparatus provide for spray drying a liquid product into a dried powder without applying heat, including: forming a slurry including a liquid solvent, a carrier, and an active ingredient; applying an electrostatic charge to the slurry; atomizing the charged slurry to produce a plurality of electrostatically charged, wet particles; suspending the electrostatically charged, wet particles for a sufficient time to permit repulsive forces induced by the electrostatic charge on at least some wet particles to cause at least some of such particles to divide into wet sub-particles; and continuing the suspending step, without the presence of any heated drying fluids, for a sufficient time to drive off a sufficient amount of the liquid solvent within most of the wet particles to leave a plurality of dried particles (the powder), each dried particle containing the active ingredient encapsulated within the carrier.

Abstract: There is provided a dispensing device for a welding rod dryer. The dispensing device may include a plurality of chambers configured to receive welding rod dryers; and a connection member provided in each of the plurality of chambers and configured to supply power to the welding dryers; and a door provided at an entrance of each of the plurality of chambers.

Abstract: An apparatus that uses an optimized body design incorporating one or more interchangeable nozzle inserts with a wide array of discharge orifice sizes, configurations and spacings to efficiently and effectively deliver a pressurized, high velocity, laminar flow air stream to dry, cool, or clean objects that are either stationary or moving transversely through the optimized air stream developed by the apparatus, all while minimizing the operational downtime required to implement the interchangeable nozzle insert modifications to the apparatus.

Abstract: A pressing arrangement for treatment of articles by hot pressing includes a pressure vessel including a furnace chamber and a furnace to hold the articles. A fan circulates a pressure medium within the furnace chamber, and enhances an inner convection loop at a load compartment. The inner convection loop pressure medium has an upward flow through the load compartment, and a downward flow along a peripheral portion of the furnace chamber. A flow generator generates a flow of pressure medium into the load compartment downstream the fan to enhance the inner convection loop. The flow is generated by transporting the pressure medium upwards from a space below a bottom insulating portion and above a bottom end portion, and by injecting the pressure medium into the load compartment downstream the fan to enhance the inner convection loop.

Abstract: The invention relates to a device having a bottom, side walls and a ceiling, which together define a channel, as well as transportation means, extending in an axial direction of said channel from an entry port of the channel to an exit port of said channel, for transferring a metallurgical material from said entry port to said exit port.

Abstract: A mechanical draft cooling tower employs air cooled condenser modules and operates by mechanical draft to exchange heat between atmospheric air and steam. The cooling tower utilizes a modular air cooled condenser with heat exchange deltas having tube bundles that are manufactured and assembled prior to being shipped to the tower site.

Abstract: A heat exchanger unit includes a heat exchanger main body in which a first heat exchanger and a second heat exchanger are arranged in series relative to a refrigerant flowing direction and an air flowing direction. The heat exchanger main body includes on one side thereof an external connection portion configured to supply at least refrigerant and on the other side thereof a communicating portion configured to connect (allowing fluid communication between) the first heat exchanger and the second heat exchanger. A bypass flow path extends from the one side to the other side of the heat exchanger main body, and is configured to bypass the first heat exchanger. At least one of the first heat exchanger and the second heat exchanger includes a pair of tank sections disposed at an interval, and a plurality of first heat transfer tubes configured to connect the pair of tank sections.

Abstract: A heat exchanger assembly having first and second heat exchangers and a seal. The seal may be disposed on the first heat exchanger and may have an elongated portion that extends toward the second heat exchanger to direct the flow of cooling air.

Abstract: An apparatus and method for cooling water in a swimming pool includes a heat exchanger coupled to a withdrawal conduit and a skimmer conduit of the pool filtering system. The heat exchanger is buried in the ground at a depth at which the ground temperature is substantially constant year-round thereby providing a passive heat sink for the heat exchanger. Water from the swimming pool is passed to a three-way valve for directing pool water either directly back to the swimming pool or through the heat exchanger for cooling pool water by heat transfer to the ground heat sink before being returned to the pool. Pool water from the skimmer conduit is selectively directed through the heat exchange while flow of pool water from the withdrawal conduit is prevented. A temperature sensor may control operation of the three-way valve and selective operation of the skimmer and withdrawal conduits.

Abstract: In a heat exchanger 1 provided with a receiver tank 9 where a tank 3 of the heat exchanger 1 are connected with each other through intermediate member 7, 8, at least one side of the intermediate member 7, 8 and an outer circumferential portion of the receiver tank 9 is provided with a restricting portion 13c, 31 that restricts a relative displacement between the intermediate members 7, 8 and the receiver tank 9 in a direction along an attachment surface of the receiver tank 9 to which at least the intermediate member 7, 8 is attached.

Abstract: A heat exchanger for use in a contact group of a sulfuric acid plant includes a chamber in which a tube bundle is arranged on a circular ring. A gas space is formed between the tube bundle and a chamber casing surrounding the tube bundle. A gas supply opening is provided in the chamber casing and is configured to introduce a gas into the gas space substantially radially to the tube bundle. A gas outlet opening adjoins an interior space enclosed by the tube bundle in a substantially axial direction. A center of the tube bundle is offset with respect to a center of the chamber casing in a direction opposite to the gas supply opening.

Abstract: Provided is a sheet-type heat pipe that has a sufficient heat transport capability and can be effortlessly installed in a thin chassis. The sheet-type heat pipe is made of a sealed container having a thickness of not larger than 0.5 mm. This container is formed by stacking and diffusion-joining together etched sheet bodies. Particularly, etching is performed on one side surface of each of the sheet bodies such that fine concavities and convexities can be formed on the inner surface of the container and the sheet-type heat pipe with a sufficient heat transport capability can thus be obtained even when the thickness of the container is not larger than 0.5 mm. More particularly, since the thickness of the container is formed to not larger than 0.5 mm, the sheet-type heat pipe can be effortlessly installed in a thin chassis such as that of a mobile terminal.

Abstract: A heat exchanger which may be continuously mass-produced by press-fitting heat exchange fins into refrigerant tubes and a manufacturing method thereof. The manufacturing method includes processing a metal sheet into a plurality of rows of heat exchange fins, transferring the plurality of rows of heat exchange fins through a transfer apparatus, dividing the plurality of rows of heat exchange fins into heat exchange fins in odd-numbered rows and heat exchange fins in even-numbered rows and integrating the heat exchange fins in odd-numbered rows and even-numbered rows through integration apparatuses, vertically standing and aligning the heat exchange fins in odd-numbered rows and even-numbered rows, separating the heat exchange fins in odd-numbered rows and even-numbered rows into a number of heat exchange fins, which may be simultaneously press-fitted into refrigerant tubes, through separation apparatuses, and press-fitting the separated heat exchange fins into the refrigerant tubes.

Abstract: A lower space of a first header collecting pipe of a heat exchanger is, by partitions, divided into three communication chambers and a single mixing chamber. The mixing chamber communicates with the communication chamber through a through-hole of a lower horizontal partition, communicates with the communication chamber through a through-hole of a vertical partition, and communicates with the communication chamber through a through-hole of an upper horizontal partition. Gas-liquid refrigerant flows into the mixing chamber, and is mixed in the mixing chamber. Then, the refrigerant is distributed to the communication chambers. Thus, the wetness of refrigerant flowing into a flat tube is uniformized among the flat tubes, and performance of the heat exchanger can be fully achieved.

Abstract: When user face information and user air-conditioning information are stored in advance via a portable information terminal and a face of a user is located within a face recognition range of an indoor imaging device, an indoor unit of an air-conditioning apparatus recognizes the face. In addition, when it is determined that the face of the user corresponds to the face of a first user represented by first user information stored in advance, the indoor unit of the air-conditioning apparatus blows conditioned air that satisfies a first user air-conditioning environment represented by first user air-conditioning information set for the first user toward the first user.

Abstract: Disclosed is a firearm configuration for a handgun. The firearm configuration is designed to reduce the recoil forces encountered by a user upon firing the weapon. Recoil forces are reduced by lowering the firearm's center of mass and by aligning a recoiling mass with the user's arm and trigger finger. The various detail of the present disclosure, and the manner in which they interrelate, will be described in greater detail hereinafter.

Abstract: A gun locking and unlocking device, which may be configured to be disposed on or in a gun to alternatively prevent or enable firing, includes a data receiver, a data memory and a logic device for determining whether security data received by the receiver is the same, or substantially the saris, as data stored in the data memory. One or more separate electronic gun key devices are provided to transmit security data and gun control signals to the data receiver of the gun lock device. The logic device responds to the gun control signals transmitted by one of the gun key devices to lock or unlock the gun, respectively, when the received security data and the security data stored in memory are substantially similar. The logic device also automatically locks the gun when the gun is located more than a prescribed distance from the gun key device.

Abstract: An improved crossbow lock mechanism includes the trigger housing, the seer lever, the seer lock lever, the latch, the trigger and an auto safety. The auto safety preferably includes a safety block, a safety lever arm and a safety lever arm lock. The safety lever arm lock is pivotally retained on one end of the safety lever arm with a safety arm lock pin. A finger engagement portion extends from one end of the safety lever arm lock and a stop portion extends from an opposing end thereof. A hand grip extends from the housing. The safety lever arm is pivotally retained in the hand grip with a safety lever arm pivot pin. A safety block actuator pocket is formed in a bottom of the safety block to receive the other end of the safety lever arm. A safety block spring biases the safety block away from the trigger lever.

Abstract: A pivot-axis, pin arrangement for rifle receivers can serve as a trigger or hammer pin therefor. A lower housing has a pair of sidewalls defining a gap and with a pair of bores spaced across the gap. The outer side of one sidewall has a slightly recessed channel which is elongated between spaced ends, at least one of which is rounded and centered on the axes of the spaced bores. The pivot axis pin has a cylindrical shaft and a T-slot head style head. The head has one portion forming an annular ring while the remaining portion is elongated to an end. In use, the pin is inserted through the bores, and is ‘simply supported’ by the ends thereof in the bores therefor. The head of the pin locks against rotation merely by settling in into at least one rounded end of the recessed channel.

Abstract: There is disclosed herein systems, methods and apparatus relating to a firearm with an electronically operable firing system to fire projectiles from the firearm. A firing mechanism is provided for mechanically and electronically firing a firearm, and a selector mechanism allows for selection of a safe mode, an electronic firing mode or a mechanical firing mode for the firearm. There also includes an electronic controller and shooter interface for controlling firing of a firearm in an electronic mode of firing.

Abstract: The invention relates to a method for the repeatable initiation of propellent charges in a weapon system, for example in the firing of projectiles from a barrel weapon, through electrical discharge between a rear electrode (22) and a front electrode (21) in a combustion chamber channel (3) filled with filler gas and comprising a combustion chamber combustion element (30), in which the filler gas in the combustion chamber channel (3) is ionized via a high-voltage potential from at least one ionizing electrode (100, 101, 102, 103), which ionization increases the electrical conductivity in the combustion chamber channel (3) so that an electrical flashover, through electrical discharge via a high-voltage generator (5) between the rear electrode (22) and the front electrode (21), is generated from the rear electrode (22) via at least one ionizing electrode (100, 101, 102, 103) onward to the front electrode (21), which results in hot ignition gas with plasma-like state being expelled from the combustion chamber cha

Abstract: A multiple rails magnetic accelerator is presented. By means of an electric discharge, a magnetic field is created which moves an armature along the rails. These rails are made in such way they can stand multiple shoots without eroding. The launcher is configured such that the critical velocity of the armature increases along the axial direction towards the muzzle as it moves through the gun. The rails are separated with a proper electrical insulator and the whole structure can be surrounded by one or more shells to confine the barrel and apply compressive stress. The compressive stresses applied preload the rails and the composite barrel structure to resist overall forces encountered during projectile firing.

Abstract: An adjustable stock assembly for a firearm includes a buffer tube extending rearwardly from a receiver, and provided with a series of recesses formed in a bottom portion thereof. A stock has a front end mounted for longitudinal axial sliding movement along the buffer tube, and a rear end provided with a butt plate. A lever arrangement is mounted on the stock for slidable movement therewith along the buffer tube to selectively engage and disengage with any one of the recesses formed in the buffer tube. The lever arrangement is positioned between the buffer tube and the stock, and is configured to prevent any movement of the stock relative to the buffer tube other than the longitudinal axial sliding movement of the stock along the buffer tube.

Abstract: A rail mountable device may be provided that is configured to be secured firmly to a rail, such as a rail on a firearm, and released easily from the rail. In one example, the rail mountable device may include a rail clamp that includes first and second rail-engaging surfaces of corresponding first and second ramp members and a cross member that, in response to rotation of a screw, move toward or away from the longitudinal faces of the rail of the firearm to secure or release the rail mountable device to or from the rail. Additional embodiments and related methods are provided.