Abstract: A calibration system and a calibration bracket are provided. The calibration bracket includes a base, a stand assembly and a support assembly. One end of a fixed vertical rod is mounted to the base, and a movable vertical rod is mounted to another end of the fixed vertical rod. The support assembly is mounted to the movable vertical rod. A driving mechanism includes a first threaded rotating member, a second threaded rotating member and a threaded fixed member. The first threaded rotating member is mounted to the fixed vertical rod. The second threaded rotating member includes a first threaded structure and a second threaded structure. The second threaded rotating member is mounted to the first threaded rotating member through the first threaded structure and is mounted to the threaded fixed member through the second threaded structure. The threaded fixed member is fixedly mounted to the movable vertical rod.

Abstract: An anti-wobbling adjustable height stool includes an adjusting screw vaving a threaded seat support spindle and a top spindle head and a stool seat assembly. The stool seat assembly includes a stool seat, and a connecting frame connected with a bottom of the stool seat. The connecting frame is opened with an installation hole, and the spindle head penetrating through and being arranged in the installation hole to enable a tight fit of the spindle head with the connecting frame.

Abstract: The present disclosure discloses a chair and a chair base. The chair base comprises a connection pipe, four support legs, and two C-shaped swinging rods. The four support legs are respectively disposed along four directions. The two support legs disposed in a left-to-right direction are fixedly connected to the connection pipe, and lower sides of middle portions of the two support legs are respectively disposed with a hinge piece. The two support legs disposed in a front-to-rear direction are rotatably connected to the connection pipe and comprise sliding sleeves. Two ends of the two C-shaped swinging rods are respectively rotatably connected to the hinge pieces of the two support legs disposed in the left-to-right direction. Middle portions of the two C-shaped swinging rods are respectively connected to the sliding sleeves of the two support legs disposed along the front-to-rear direction through link rods.

Abstract: The disclosed technology includes devices and methods for detecting rare cells in whole blood samples using a microfluidic device. Such devices include a housing with a microfluidic chamber having first and second microfluidic layers, each microfluidic layer having an array of microscale structure. Other disclosed devices also include a housing including a chemically functionalized hydrogel matrix and a pump connected to the housing. Disclosed methods include constructing, with an additive manufacturing device, a microfluidic device having a microfluidic chamber, removing, by a thermal release process, at least some of the sacrificial support material deposited by the additive manufacturing device, and chemically functionalizing at least a portion of the microfluidic chamber. Other disclosed methods include chemically functionalizing a hydrogel matrix and connecting the chemically functionalized hydrogel matrix to a pump.

Abstract: Provided is a length-adjustable column with a standpipe having a longitudinal axis, a length-adjustment device arranged in the standpipe with a portion displaceably-mounted along the longitudinal axis with respect to the standpipe and an anti-rotation locking device for locking the portion against a rotation around the longitudinal axis relative to the standpipe. The anti-rotation locking device includes an inner element, which is fastened to an outer surface of the portion, and an outer element, which is fastened to an inner surface of the standpipe. The inner element cooperates with positive locking with the outer element against a rotation around the longitudinal axis, and is displaceably guided along the longitudinal axis by the outer element. The inner element is connected with the portion through a substance-to-substance connecting layer.

Abstract: An adjustable strut that includes an outer housing configured to receive an extendable member, and an extending mechanism with a gear system configured to convert rotation motion of an input mechanism into linear translation of the extendable member.

Abstract: A magnetic locking actuator for a prosthetic or orthotic device is provided. The actuator includes a first component including one or more magnets and a second component including one or more magnets. The first and second components are coupled to separate portions of the device. The magnets allow for adjustment of a length of the actuator to adjust an angular orientation of the first and second portions of the device. When magnets in the second component are aligned with magnets in the first component having an opposite polarity, a position of the second component is fixed relative to the first component, locking the actuator. When magnets in the second component are not aligned with magnets in the first component having the opposite polarity, the position of the second component is adjustable relative to the first component, thereby allowing adjustment of the height of the actuator.

Abstract: A desk has a base that rests on an underlying floor surface, a work surface that is supported by the base, and a seat that is rotatably connected to the base for rotation between a first position, located in a conventional position behind the desk so a person may sit at the desk, and a second position, located to one side of the desk so that a person may instead stand at the desk. The seat is adjustable radially relative to its axis of rotation, vertically up and down relative to the floor surface, and angularly toward its axis of rotation.

Abstract: A seating furniture chassis having a height-adjustable seat surface, a drive means, a shaft, a height-adjustment mechanism and a threaded rod, wherein the drive means is coupled to the shaft and is designed to transmit a torque to the threaded rod by means of the shaft, and wherein the height-adjustment mechanism is coupled to the threaded rod and to the seat surface such that a rotation of the threaded rod is converted into a height adjustment of the seat surface by means of the height-adjustment mechanism, characterized in that a longitudinal axis of the shaft is not arranged parallel to a longitudinal axis of the threaded rod.

Abstract: Provided are systems and methods for a telescope observation chair assembly. The assembly includes a seat having a pad, a telescoping portion extending from the pad, and an adjustment assembly at least partially disposed interior to the telescoping portion. The assembly also includes a housing comprising one or more walls having one or more slots and one or more grooves cutout therefrom, the one or more walls receiving the telescoping portion of the seat. The assembly further includes a footrest.

Abstract: The present invention relates to a screw arrangement (10), comprising: a drive unit (16) for introducing a torque into the screw arrangement, a drive element (24) driven in rotation about a main axis (A) of the screw arrangement by the drive unit (16) and having an external thread (30), and a driven element (12) having an internal thread (32), which is in threaded engagement with the drive element (24). The invention further relates to a seat arrangement.

Abstract: A lifting column includes a component having an internal thread, as well as a hollow shaft having an external thread, which is in engagement with the internal thread of the component. A threaded spindle is disposed inside the hollow shaft and has an external thread, which is in engagement with an internal thread of the hollow shaft. Furthermore, the lifting column includes a drive device configured to rotate the hollow shaft relative to the threaded spindle and the component. When the hollow shaft rotates, the component and the hollow shaft move in the same axial direction so that the height of the lifting column is changeable.

Abstract: A seat pivotably mounted to a seat base via a swivel connector, and a work surface assembly pivotably mounted above the seat base and below the seat via the swivel connector. In particular, a bushing may be attached to an outer surface of the swivel connector in a manner in which the bushing is axially fixed, yet rotatable relative to the swivel connector, such as via an arrangement of protrusions and grooves on the bushing and connector, respectively. A portion of the tablet arm is received over the bushing, such that the bushing provides a low-friction interface between work surface assembly and the seat. In this arrangement, the pivot connection between the work surface assembly and the chair is functionally independent of the pivot connection between the seat and seat base. This functional independence facilitates assembly of the work surface assembly to the chair, and allows the pivotable work surface to be retrofit to preexisting swivel chairs.

Abstract: An underwater wildlife connection swimming pool is configured to engage human users with aquatic wildlife. The underwater wildlife connection swimming pool includes a swimming pool that is configured to accommodate swimming pool water with chemicals and temperatures used in recreational swimming. The swimming pool further comprises entirely transparent walls attached to an entirely transparent floor. A swimming pool deck is mechanically coupled to the swimming pool. An aquatic wildlife tank is attached to the swimming pool deck. The aquatic wildlife tank has an aquatic wildlife tank floor. The aquatic wildlife tank is configured to accommodate aquatic wildlife tank water with temperature and salinity safe for the aquatic wildlife. A plurality of swimming pool inserts are mechanically coupled to the entirely transparent floor. A plurality of support columns are mechanically coupled to the plurality of swimming pool inserts and the aquatic wildlife tank floor.

Abstract: A chair includes a base, a seat assembly comprising a seat, and a height adjustment mechanism attached between the base and the seat assembly. The height adjustment mechanism vertically moves a position of the seat from a first position to a second position that is higher than the first position. The height adjustment mechanism includes a first gas spring attached to the base, a second gas spring attached to the seat assembly, and a support attached between the first gas spring and the second gas spring. The first gas spring is at least partially within a lower portion of the base and the second gas spring is at least partially within the seat assembly. The seat assembly is movable relative to the lower portion of the base.

Abstract: A fluid delivery system includes a laboratory instrument that operates using fluid retained in one or more containers. The containers are supported on a motor-driven lift that is configured to transport the containers between a lowered position suitable for handling and an elevated position suitable for the delivery of fluid to the instrument by gravity. The lift includes a bench-mountable base, a tubular column extending upward from the base, an elongated lead screw extending longitudinally through the column, a drive mechanism for rotatably driving the lead screw, a carriage slidably mounted over the tubular column and mechanically coupled to the lead screw, a platform removably coupled to the carriage for supporting the containers, and a control system for regulating operation of the drive mechanism. During operation, a slot provided in the column restricts travel of the platform along a predefined path that is linear in part and helical in part.

Abstract: Gear, preferably for actuators of the type, where an electric motor (1) through the gear drives an activation element, such as a pivotal arm or a longitudinally movable element, and where the gear has at least two gearing stages. The first stage is constituted by a worm drive with a worm—(11; 13a, 13b) and the subsequent gearing stage is constituted by a crown and bevel wheel (23; 16a, 16b). The crown wheel faces towards the worm drive and has a power take-off (24, 27) in extension of or in all essentials in extension of the worm (11) or parallel thereto. The bevel wheel (16a, 16b) is with its axis of rotation arranged perpendicular in relation to the axis of rotation of the worm (11), and the worm wheel (13a, 13b) is in drive connection with the bevel wheel (16a, 16b) through a gear train (14a, 15a; 14b; 15b). Thus a relatively compact transmission with a high gearing is achieved, and by having worm wheels, toothed gearing and bevel and crown wheels of plastic the transmission is in addition silent.

Abstract: A height adjustment device for an imaging apparatus includes a driving shaft, first and second moving bodies and a driving device. The driving shaft is configured to rotate in a main body of an imaging apparatus. The driving shaft has first and second spiral grooves defined on a peripheral surface thereof such that the first spiral groove has a first pitch along the driving shaft and a second spiral groove has a second pitch different from the first pitch along the driving shaft. The first moving body has a screw thread engaged with the first spiral groove of the driving shaft. The second moving body has a screw thread engaged with the second spiral groove of the driving shaft The driving device rotates the driving shaft.

Abstract: A seat tube of a bicycle has a tubular body and a tightening block. The tubular body has an insertion hole and a stationary block. The insertion hole is defined in the tubular body and has an inner surface and a tightening recess. The inner surface is formed in the tubular body. The tightening recess is defined in the inner surface. The stationary block is embedded in the tightening recess and has an oblique surface and a fastener hole. The fastener hole is defined in the oblique surface. The tightening block is mounted slidably on the oblique surface and has a tightening surface, a through hole and a fastener. The tightening surface is shaped to correspond to the inner surface. The through hole is defined through the tightening block. The fastener is mounted through the through hole and engages the fastener hole.

Abstract: A support apparatus includes a first substantially horizontal member positioned adjacent to first and second elongated substantially vertical member members. The first substantially horizontal member has a channel formed in its rear side. The channel is sized and configured to receive wiring for display devices. The first substantially horizontal member is supported or attached to first and second collars positioned on the first and second elongated substantially vertical members such that movement of the first and second collars adjusts a vertical position of the first substantially horizontal member. One or more display devices, such as LCD screens or computer monitors, may be positioned on the first substantially horizontal member.

Abstract: A lifting column for treatment tables, hospital- and care beds with a casing consisting of three telescopic members (11, 12, 13) with a drive unit located in the hollow of the intermediate member (12). The drive unit comprises a body element (22) with chain wheels (25, 33) and one chain (47) provided with driving rods (50, 51) secured to the two other telescopic members (11, 13). The drive unit further comprises a linear actuator (18) with an electric motor (19), which drives a spindle (21) located within the cross section of the body element (22) and a spindle nut (28) secured thereto for longitudinal displacement of the body element (22) with the chain wheels (25, 33), so that the telescopic members (11, 12, 13) are extended or retracted depending on the direction of rotation of the motor. Thus a compact structure is achieved as the guide is constructed as a casing and the actuator is integral with the body element which has one chain only.

Abstract: A support device includes a platform, a connecting rod connected with the platform, a main support unit connected with the connecting rod, a weight member connected with the main support unit, two opposite clamping boards each pivotally mounted on the weight member, a swivel mechanism swivelably mounted between the connecting rod and the main support unit, a pivot member pivotally mounted on the swivel mechanism, and an auxiliary support unit connected with the pivot member. Thus, the video camera support device can be operated in two different manners to facilitate a user carrying the video camera. In addition, when the platform is moved by the user, the platform is kept at a horizontal state by provision of the weight member and the clamping boards so that the video camera is moved solidly and stably.

Abstract: In one embodiment, a loading fitting includes at least one of an I, a T, and a J shaped cross-section having a flange attached to at least one supporting structure. In another embodiment, a method is disclosed for attaching a loading fitting to at least one supporting structure.

Abstract: A projection apparatus including a projection body and at least one adjusting leg is provided. The projection body has a casing, and the bottom of the casing has at least one accommodating cave. The adjusting leg includes a supporter and a pivoting rod. The supporter has a supporting portion and a screw connected to the supporting portion, and the projection body is capable of being supported on a surface by the supporting portion. The pivoting rod is pivoted to the casing and has a threaded hole, and the screw is screwed into the threaded hole. The pivoting rod is capable of being rotated along an axis of the pivoting rod to drive the supporter to rotate, so as to accommodate the supporting portion in the accommodating cave.

Abstract: A metal support column shipping assembly, including a metal tubular support column with a shaft protruding from a top end of the support column. A top plate is provided having an aperture extending therethrough adapted to engage a remote end of the shaft. A bottom plate is provided which has a collar adapted to engage a bottom end of the support column. The bottom plate also has an aperture extending therethrough. The assembly has the shaft extending through the aperture in the top plate and the aperture in the bottom plate. A nut positioned on the shaft prevents the top plate and the bottom plate from being removed from the shaft.

Abstract: A raised floor pedestal including a base configured to sit on a floor; and a post extending up from the base. The post includes a metal member having a general tube shape. A top of the post forms a support surface configured to support a portion of a raised floor system thereon. A side of the post includes an integrally formed ground conductor connector piece extending therefrom. The ground conductor connector piece is configured to have an electrical ground conductor connected directly thereto.

Abstract: A force adjustment assembly for use within a telescoping subassembly that includes a first elongated member and a second elongated member that is supported by the first elongated member for sliding motion along an extension axis, the subassembly further including a force equalizer assembly that includes a strand having first and second ends that are supported by the second and first elongated members, respectively, the adjustment assembly comprising a preloader supported by at least one of the first and second elongated members and supporting at least a portion of the strand, the preloader applying a preload force via the strand when the second elongated member is in a fully extended position and an adjuster for adjusting the preload force applied by the preloader.

Abstract: A mast support system for use with a container (e.g., a Connex container) to hold a light fixture, security camera and other accessories that may be desirable to mount above or from the roof of the container, generally comprising a support structure for purposes of supporting the accessories, and means to affix the support structure to the container. Embodiments of the mast support system disclosed include one or more posts removably attached to a base, which is engaged with the corner of a container. Attached to the posts are accessory support systems, extending therefrom for positioning and angling the accessories.

Abstract: A microscope stand which can include a base, a driving mechanism, a hollow column, a translational element and a support element is described. The hollow column can have at least one elongated opening that extends between a first end and a second end of the column wherein the column is attached to the base at the first end. The translational element is disposed substantially inside of the hollow column and is adapted to cooperate with the support element via the at least one elongated opening, the support element is moveable by the translational element along the column in a direction between the first end to the second end.

Abstract: The present invention relates to a portable information sign device. In one embodiment of the invention, a top plate comprises a foundation and three plate coupling ports. A center arm comprises an arm rod axially coupled to the top plate foundation. A sliding plate is slideably coupled to the arm rod and comprises a sliding plate foundation and three sliding plate coupling ports. A spring encircling the arm rod is connected on a first end to the sliding plate foundation and on a second end to a stop coupled to the distal end of the arm rod. Three guide arms are connected to the coupling ports of the sliding plate foundation. Three legs are connected on one end to the coupling ports in the top plate and on the leg end to coupling ports on the guide arms.

Abstract: An adjustable stand includes a leg, a first member secured to the leg, a second member adjustably secured to said first member, and a support member for holding items on the stand, the support member is secured to the second member. A first adjustment mechanism is coupled between the first member and the second member. Movement of the first adjustment mechanism shifts the position of said second member relative to said first member thereby raising or lowering said support member. A retention member is secured between the first member and the second member, the retention member securing the first member to the second member, while allowing at least limited relative movement relative to the first member. A first adjustment mechanism includes a nut threaded on a shaft, bearing against the first tubular member and an anti-rotation lock secured to the shaft and coupled to the first tubular member.

Abstract: A telescopic display stand includes a base and a fixed tube secured on the base. A first telescopic tube and a second telescopic tube are in turn telescopically received in the fixed tube. A gear box is mounted in the first telescopic tube, and a plug is mounted in the second telescopic tube. A first threaded rod has a bottom end rotatably received in the fixed tube and threadingly extends through the gear box. A second threaded rod has a bottom end rotatably mounted in the gear box and threadingly extends through the plug. A driving unit is mounted on the gear box for driving gears in the gear box. An effigy sheath is mountable over the fixed tube and telescopic tubes. Whereby, the display stand can be automatically erected and retracted.

Abstract: A telescope support stand system for side cutaway view of the present invention in the contracted position. The telescope support stand system includes a base that is permanently secured to a floor, a lower tube attached to the base, an upper tube slidably positioned about the lower tube, an elevating unit within the lower tube for elevating the upper tube, and a support plate attached to the upper tube for mounting a telescope thereto. The outer tube preferably includes a plurality of alignment plates for providing a reduced friction guide surface for sliding about the lower tube.

Abstract: A magnetic recording and reproduction apparatus includes an arm section pivotable about a pivoting shaft; a tape guide section provided on the arm section for guiding a magnetic tape; a capstan section for driving the magnetic tape so as to run; and a maintaining section provided on the capstan section. The arm section is pivotable between a first location and a second location. The first location is a location at which the information recording to and/or information reproduction from the magnetic tape is possible. The second location is a location at which the information recording to and/or information reproduction from the magnetic tape is not possible. When the arm section pivots from the second location to the first location, the maintaining section maintains a relative position of the arm section, which is in the first location, to the capstan section.

Abstract: An elevating device includes a casing with an upper opening defined to allow the upper tube to extend into the casing and a lower opening defined to communicate with the upper opening and allow the lower tube to extend into the casing, a worm gear rotatably received in the casing to mesh the rack of the upper tube, and a worm shaft extending into the casing to mesh the worm gear so as to drive the movement of the upper tube relative to the lower tube.

Abstract: An office chair includes a frame having a tube with a tapered inner periphery and a plurality of legs extend from the tube. A C-shaped sleeve is movably received in the tube and has a tapered outer periphery. The sleeve has a threaded inner periphery so as to be threadedly engaged with a seat post. Two notches are defined in the tapered outer periphery of the sleeve so that two pins extend through the tube and are engaged with the two notches to restrict the sleeve from being rotated. The sleeve is firmly clamp the seat post when a load is applied downward the seat post. When lifting the seat post, the sleeve is raised and loosened so that the seat post is adjustable.

Abstract: An improved light duty easily adjustable pipe support assembly having a flat base, cushion pad, and free turning adjustment rods. Each adjustment rod has an adjustment knob with friction locking capabilities that permits ease in the turning of the rod while preventing inadvertent turning. A pipe support devise engaged upon the adjustment rods travel vertically up or down along the rods when the knobs are turned. A pipe roller assembly has the capability to compensate for lateral as well as linear movement of the piping system it is intended to support.

Abstract: A longitudinally adjustable leg assembly, comprising a holder (9, 12) which is adapted to be fixed to the underside of a table top (1); first and second elongate carrier elements (2, 3) which are directed away from the holder (9, 12) and cooperate by threaded engagement. The first carrier element (2) is mounted rotatably but axially immovably in the holder (9, 12) and one (2; 3) of the first and second carrier elements (2, 3) having an external thread and the other (3; 2) of the first and second carrier elements (2, 3) being a tube having an internal thread portion at one end in threaded engagement with the external thread. An electric motor is arranged for rotating the first carrier element (2). A device is arranged for interrupting the current to the motor when the leg assembly is in a limit position of maximum or minimum length.

Abstract: A longitudinally adjustable leg assembly, comprising a holder (9, 12) which is adapted to be fixed to the underside of a table top (1); first and second elongate carrier elements (2, 3) which are directed away from the holder (9, 12) and cooperate by threaded engagement. The first carrier element (2) is mounted rotatably but axially immovably in the holder (9, 12) and one (2; 3) of the first and second carrier elements (2, 3) having an external thread and the other (3; 2) of the first and second carrier elements (2, 3) being a tube having an internal thread portion at one end in threaded engagement with the external thread. An electric motor is arranged for rotating the first carrier element (2). A device is arranged for interrupting the current to the motor when the leg assembly is in a limit position of maximum or minimum length.

Abstract: The invention relates to a drive for mechanically displacing and positioning two profile parts relative to each other, comprising: at least one tooth path connected to a one profile part, at least one toothed wheel connected rotatably to a second profile part for engaging on the tooth path, drive means, and a transmission mechanism for transmitting to the toothed wheel the power produced by the drive means, wherein the transmission mechanism is provided with at least one right-angled transmission.

Abstract: A heat exchanger housing support for supporting a heat exchanger or coil housing and accompanying ductwork in the installation of heating and air conditioning equipment. The heat exchanger housing supports are typically used in pairs and are each characterized by a vertically-oriented support leg having a longitudinal leg cavity for receiving a threaded rod, with an adjusting nut provided on the threaded rod and a bevel gear provided on the adjusting nut. A second bevel gear is mounted on the support leg for meshing with the first bevel gear on the adjusting nut and driving the threaded rod up and down. A bottom bracket is attached to the bottom end of the support leg for resting on a supporting surface and a top bracket is fitted to a top nut threaded on the upper end of the threaded rod for engagement with the heat exchanger or coil housing.

Abstract: A seat mechanism for mounting in a shower or bathtub has a telescoping lift column that raises and lowers the seat. The column has mutually interacting elements that have two end elements and at least one middle element between them. The at least one middle element and at least a first of the end elements have external threads. The at least one middle element and a second of the end elements have internal threads. A drive is arranged to rotate one of the two end elements.

Abstract: A height adjusting apparatus includes a vertical outer tube that is adapted to be fixed on the base, and a vertical inner tube that is adapted to be fixed on the working table and that is mounted telescopically on the outer tube. A guiding device guides the inner tube to move vertically within the outer tube while preventing rotation of the inner tube relative to the outer tube. An externally threaded vertical rod is journalled in the outer tube, and engages threadably an internal thread portion of the inner tube. A driving mechanism includes a driven bevel gear that is mounted coaxially and fixedly on the vertical rod, and a driving bevel gear, which is mounted rotatably in the outer tube and which meshes with the driven bevel gear. The driving bevel gear rotates about a horizontal axis so as to rotate the vertical rod, thereby moving the inner tube vertically within the outer tube.

Abstract: A microphone stand assembly includes a leg base that has a number of legs each having an end pivotally connected to a lower end thereof. A post includes a lower tube having a lower end connected to the leg base, an upper tube slidably received in the lower tube, and a first clamping sleeve for holding the upper tube in place relative to the lower tube. A pivotal base includes a seat secured to an upper end of the upper tube and including a first through hole therein. The pivotal base further includes a connecting block including a section pivotally connected to the seat and a second through hole defined therein. A holder rod is slidably extended through the first through hole, the second through hole, and the upper tube. The holder rod is removable from the first through hole and the upper tube. A second clamping sleeve is provided to hold the holder rod in place relative to the upper end of the connecting block. A microphone holder is secured to the upper end of the holder rod.

Abstract: A height-adjustable column has a stationary tube that receives a height-changing mechanism, such as a pneumatic spring having a cylinder and a rod that are axially movable with respect to one another. A transmitting mechanism includes a movable member that is operatively associated with the rod and is movable in a direction opposite to the direction of movement of the cylinder upon extension of the pneumatic spring when the pneumatic spring is in a predetermined lift zone.

Abstract: A bobbin core holder for a bobbin creel. The bobbin core holder includes a sleeve body securable on a creel rod, on which sleeve body a ring socket is fitted so as to be rotatable into at least one predeterminable rotary position by a releasable spring detent mechanism. The bobbin core holder also includes a bearing block on the ring socket having a bore therein for the bobbin core and an additional threaded bore opening into the bobbin core bore for a set screw. The bobbin core bore is open at both ends and is circumferentially closed with its axis extending transversely with respect to the axis of the ring socket. The bobbin core bore has an intermediate longitudinal section which at least partly extends through the ring socket, and the length of the bobbin core bore is approximately the same as the outside diameter of the ring socket. The threaded bore extends approximately radially relative to the ring socket axis.

Abstract: A musician's chair includes a stand, the stand having a top barrel, a locating ring spaced below the top barrel, and a sleeve connected between the top barrel and the locating ring, a seat with a threaded seat stem inserted into the sleeve of the stand, a seat stem holding down device connected to the top barrel and controlled to hold down the seat stem against vibration, and a seat stem fixture supported on the seat stem holding down device and controlled to fix the seat stem at the desired elevation, wherein the seat stem holding down device includes a fixed plate integral with the barrel of the stand, a movable plate hinged to the fixed plate at one side, and a fastener fastened to the movable plate and the fixed plate to fix the movable plate and the fixed plate in a closed condition, causing the seat stem of the seat to be held down in a hole at a horizontal top wall of the fixed plate.

Abstract: An instrument support has a support, a securing device threadingly connected with the support, a baffle detachably received within the support and a securing tube detachably received within the support and having an extension detachably connected with the baffle. When a pole of a music rest or the like is inserted into the securing tube and the support, threadingly inserted the securing device into the support will force the baffle to move toward the extension of the securing tube and thus the extension will urge the pole and thus achieve a securing effect to the pole.

Abstract: A pole support is adapted for use in a mast assembly of a sail craft to selectively adjust tension of a sail. The mast assembly comprises an elongated and rigid tubular member having a central longitudinal axis and a surrounding sidewall defining an interior therefor. The tubular member has a base portion adapted to engage a mast foot and an upper portion sized to slidably engage a mast pole. A selectively actual drive mechanism includes a lift structure which is operative to support the mast pole and upon actuation of the drive mechanism to adjustably vary the effective length of the mast assembly by moving the mast pole further from and closer to the base portion, thereby to respectively increase and decrease tension of the sail when the tack is secured to the mast foot. The lift structure may also include a collar slidably disposed thereon, which collar has a neck to provide a first protective spacer between the mast pole and the tubular member.

Abstract: In an integrated telescoping mast-payload assembly, the payload forms the top telescoping section.