Abstract: A container is provided in the present disclosure. The container includes at least one outer wall that is made of a low temperature tolerant material where the at least one outer wall is arranged to substantially form the container with an opening end; a tube that is situated inside the at least one outer wall, where the tube and the at least one outer wall are substantially thermally insulated, and the tube is open at one end that is on a same side of the opening end of the container; and a container cover being shaped substantially to match the at least one outer wall, where the container over is capable of covering the opening end of the container.

Abstract: The present invention discloses a container with synchronous rising and lowering functions, which is configured to contain an article. The container comprises: a box body, having a containing space therein; a cover unit, connecting one side thereof to one side of an upper edge of the box body; a lifting unit, locating in the containing space for being placed the article; and a connection unit, connecting the cover unit and the lifting unit, wherein when the cover unit is opened, the cover unit is linked with the connection unit to allow the connection unit to drive the lifting unit to rise synchronously, and when the cover unit is enclosed, the cover unit is linked with the connection unit to allow the connection unit to drive the lifting unit to lower synchronously.

Abstract: A dispenser apparatus may include a housing and a delivering structure at least partially enclosed by the housing. The dispenser apparatus may dispense desired sizes or pieces of tablets, pills candy, mints, chewing gum or the like. The dispenser apparatus is refillable when a cover or lid is open.

Abstract: Provided is wet-sheet packaging allowing an outer take-out opening to be easily closed and opened using a closure sheet, preventing a permeating liquid from being leaked from an inner container when the wet-sheet packaging has fallen over, irrespective of the number of wet sheets in the inner container. Wet-sheet packaging has a layered body consisting of wet sheets wetted by a permeating liquid accommodated inside an outer bag having an outer take-out opening that is freely opened and closed by a closure sheet at the upper surface of the outer bag. Wet-sheet packaging includes an inner container that has shape-retention capability, and accommodates both layered body and permeating liquid, and an inner sheet that firmly closes the opening of the inner container and has a breakable part along which an inner take-out opening is formed, and in which the inner take-out opening corresponds to the outer take-out opening.

Abstract: A smoking accessory includes a housing having a top end, and a first compartment and a second compartment both opening outwardly at the top end. The first compartment is configured to hold a smoking device, and the second compartment is configured to hold smoking material. In addition, the smoking accessory includes a locking device carried by the top end of the housing, and a lid configured to selectively cover the top end of the housing. The lid includes a locking feature and is configured to cooperate with the locking device to retain the lid in at least a closed position. The locking device may include a spring plunger, and the locking feature may include at least one indentation in the lid for receiving the spring plunger.

Abstract: A container (10) for consumer articles comprises a box portion (12) and a lid portion (14) connected to the box portion (12) along a hinge line (16) extending across a container back wall. The lid portion (14) is pivotable about the hinge line (16) between a closed position and an open position, and comprises a lid top wall (30), a lid back wall (28), and a lid back edge portion (34) connecting the lid top wall (30) and the lid back wall (28). The lid back edge portion (34) extends between an upper edge (36) of the lid back wall (28) and a back edge (38) of the lid top wall (30).

Abstract: A packaging container for an elongate object has a base and a protective sleeve to be pushed in a direction of a longitudinal axis of the protective sleeve onto the base. The protective sleeve can be secured at the base. The base has a receptacle for an end of an elongate object and the protective sleeve covers an elongate object received in the receptacle. The packaging container has a primary part of a first external coupling device and the primary part is detachably connectable to a secondary part of a second external coupling device that is provided on a further packaging container.

Abstract: An infuser comprises a container, at least one substance bounded by the container, honey in a semi-solid state bounded by the container, and a sealing substance. The container comprises a flexible material with pores. The sealing substance comprises dried honey, is disposed in the pores of the material, and has a higher melting point than the honey in a semi-solid state. The container and sealing substance are configured to resist substantial movement of the honey in a semi-solid state and the at least one substance through the pores of the material until the sealing substance reaches a temperature above the melting point of the honey in a semi-solid state.

Abstract: A technique facilitates delivery of bulk materials at a desired site, such as a wellsite. According to an embodiment, a silo is pivotably mounted to a trailer, such as an over-the-road trailer. An actuator is coupled between the silo and the trailer to enable transition of the silo between a transverse position for transport and an upright position which facilitates outflow of the bulk material. The system also may comprise various other features used alone or in combination, such as pivotable wings, a foldable trailer, and an adjustable suspension which allows a frame of the trailer to be positioned firmly on the ground.

Abstract: The present invention is directed to a bag of polymeric film and a method to make the bag. The bag can be comprised of a front panel and a rear panel. The front and rear panels can each be comprised of multiple layers of film. The bag can be formed from a collapsed bubble of polymeric film that has been folded in half so that opposing edges of the collapsed bubble form an opening of the bag. One of the layers of the folded bubble can be split adjacent to an edge of the collapsed bubble and a draw tape film can be inserted between the layers of the folded and collapsed bubble. The collapsed bubble can further be embossed by a pattern that can provide enhanced properties to bags formed from the folded bubble.

Abstract: A waste disposal system with a compact footprint. The waste disposal system device accepts a cassette having a length of tubular liner film. The waste disposal device and cassette can have similar cross-sectional geometry. The waste disposal device and/or cassette comprise a first wall, a second wall, and a first included angle defined therebetween between about sixty and about one-hundred twenty degrees.

Abstract: A flow rack assembly includes a support structure. A supply track assembly supported by the support structure extends in a longitudinal direction. The supply track assembly declines in elevation from a component supply location to a component pick location. A return track assembly is supported by the support structure that extends in the longitudinal direction. The return track assembly declines in elevation from the component pick location to a tray storage location. A transition support shelf is rotatably connected to the support structure at a pivot location. The transition support shelf is rotatable about the pivot location due to gravity between a component pick configuration that receives component trays from the supply track assembly and a tray transition configuration that delivers component trays to the return track assembly.

Abstract: Disclosed herein is an apparatus and method of autonomous Controlled Environment Agriculture (CEA) comprising a fully autonomous growing environment. More specifically, disclosed herein is an apparatus and method in which a plurality of frame assembly may be stored and manipulated within a track assembly that is configured within a rack through the motivational input a carriage-mounted manipulators. Each frame assembly is configured to be coupled to an adjacent frame assembly supported by the track assembly by at least one coupler disposed on a forward end and a rearward end of each frame assembly. With the frame assembly including a low friction bearing surface to orient within a track assembly, it may be configured to satisfy various utilities necessary within the farm, such as but not limited to the housing grow media for the cultivation or the housing of electromechanical systems.

Abstract: A storage system having crash barriers is described. The crash barriers are mounted on separate structures, the structures being mounted adjacent the storage system. The separate structures include tracks such that robotic load handling devices operating on the storage system may over run without causing damage to the main part of the storage system.

Abstract: A variety of vehicle-based and warehouse-based solutions are provided to increase the adaptability, utility, and efficiency of materials handling vehicles in the warehouse environment, such as a goods storage and retrieval system, comprising a multilevel warehouse racking system, a mobile storage cart, a cart home position, and a materials handling vehicle disposed on a vehicle transit surface and comprising a fork carriage assembly, a navigation subsystem, a cart engagement subsystem, and one or more vehicular controllers to use the navigation subsystem to navigate the materials handling vehicle along the vehicle transit surface to a localized engagement position where the cart home position is within a cart engagement field of view, and use the cart engagement subsystem to engage the mobile storage cart in the cart home position with the fork carriage assembly.

Abstract: A storage array system including an open undeterministic transport surface, a navigation array disposed in connection with the transport surface, the navigation array includes a distributed feature, a first waypoint at a first position of the distributed feature, a second waypoint displaced from the first waypoint along the distributed feature and offset with respect to the first waypoint in a direction angled to the distributed feature, and a guided bot, arranged to traverse the transport surface, with a non-holonomic steering system, the guided bot having a bot pose determination system employing sensor data detecting the distributed feature, wherein the guided bot includes a controller configured to generate a substantially smooth curved bot traverse path on the transport surface connecting the first and second waypoints with a predetermined optimal trajectory of the guided bot along the traverse path determined based on a bot dynamic model.

Abstract: A Moving Assistance Device comprises a plurality of straps, comprising an inner strap and an outer strap; a plurality of adjustable and removable handles; and a plurality of buckles, wherein the buckles and handles travel along the straps providing means of tightening and securing the straps to an object to be moved.

Abstract: A conveyance system includes a plurality of coils arranged so as to form a row at a predetermined pitch, a carriage configured to move along the row through use of an electromagnetic force received from the plurality of coils as a driving force, a plurality of drivers configured to cause an electric current to flow through coils to be controlled among the plurality of coils to provide the driving force to the carriage, and a controller configured to switch the coils to be controlled, which are assigned to each of the plurality of drivers, among the plurality of coils. As the coils to be controlled, which are assigned to each of the plurality of drivers, among the plurality of coils, coils for each predetermined interval of at least two pitches based on a distance between carriages determined in advance are assigned to each of the plurality of drivers.

Abstract: An improved vibratory bowl feeder is provided. The improved vibratory bowl feeder includes a removable impact cone formed from an impact resistant material to deflect falling industrial workpieces toward the sidewall of a bowl. The impact cone includes a through-hole for a center bolt, the center bolt securing the impact cone to the bowl. An adhesive layer bonds the impact cone to the bowl, which is optionally formed from stainless steel. The impact cone includes a frusto-conical or hemispherical impact surface that deadens the impact from industrial workpieces falling from an overhead hopper. Replacement of the impact cone can be achieved within minimal downtime, and varying impact cones can be selected based on the size and the shape of the industrial workpieces for a given inspection run.

Abstract: A machine and method for the application of pressure relief valves for hermetic containers. The machine comprising an applicator configured to apply the valves to containers, a vibrating feed container for housing the valves and making the valves directly available to the applicator, an aspirator configured so as to suck the valves contained within a reservoir and convey them to the vibrating feed container through a tube. The method comprises supplying pressure relief valves to the vibrating feed container of the machine by sucking the valves from the reservoir.

Abstract: Disclosed is a food waste treating apparatus including: a housing including a food inlet opening on its upper surface; and a rotating shaft assembly provided within the housing and configured to mix food waste within the housing. The rotating shaft assembly includes: a rotating shaft; a plurality of supporting bars evenly spaced and extended from the rotating shaft in a perpendicular direction to the rotating shaft; a plurality of agitating blades provided at ends of the plurality of supporting bars respectively; a motor configured to supply power to rotate the rotating shaft; and a torque transferring structure connected to both ends of the rotating shaft and configured to transfer torque from the motor.

Abstract: A hydraulic actuator is provided within a belt-type agricultural conveyor for controlling the position of the tension roller of the conveyor belt, together with a hydraulic controller which supplies a controlled pressure of hydraulic fluid to the hydraulic actuator. In this manner, a consistent tension can be applied to the endless conveyor belt in an automated manner through a large range of movement so that the maintenance step of periodically removing a section of the belt as the belt stretches can be minimized in frequency. Furthermore, the endless belt is always operated at an optimum tension for extending the life of the belt. The hydraulic actuator also enables the tension to be removed from the belt in a simple manner by displacing a switch to remove tension from the belt whenever the conveyor is not in use for yet further extending the life of the conveyor belt.

Abstract: A system for conveying proppant includes a conveyor assembly having a conveyor belt that receives proppant from one or more containers having proppant stored therein. The system also includes a conveyor auxiliary unit connected to an end of the conveyor assembly having one or more joints to enable expansion and collapse of the conveyor belt from the conveyor assembly. The system further includes a proppant chute to direct the proppant from the conveyor belt into a blending hopper, the proppant chute being positioned at a higher elevation than an inlet of the blending hopper.

Abstract: An embodiment includes a plurality of transport modules forming a transport path on which a carriage that transports a workpiece travels, and a control unit that controls a position of the carriage on the plurality of transport modules based on a drive instruction, and the control unit corrects the drive instruction during carriage motion that is based on the drive instruction and stops the carriage.

Abstract: A loading plate structure and a carrier are provided. The loading plate structure applied to a panel carrier for transporting panels. The loading plate structure comprises of a main body, the main body including at least one recess for receiving a panel therein, wherein a size of any side of the at least one recess is larger than a size of a corresponding side of the panel received therein, and a taking/disposing location formed on the main body with an opening for taking or disposing the panel, wherein through the taking/disposing location the panel is disposed in one recess corresponding to a size of the panel, or is taken out from the recess. The loading plate structure and the carrier can prevent effectively the panels from falling in transport process, promote transport efficiency and product yields, and increase the convenience of late maintenance and cost control.

Abstract: A substrate inspection system includes a floating unit that floats a substrate, an inspection unit disposed above the floating unit, a grip unit disposed below the inspection unit and including a first grip member that holds the substrate on the floating unit, a grip transfer unit that moves the grip unit in a first direction, and an illumination unit that generates light. The inspection unit inspects the substrate that floats on the floating unit, the illumination unit is disposed on a moving path of the grip unit, and the light generated by the illumination unit is irradiated onto the inspection unit. The first grip member includes a first adsorption pad that adsorbs the substrate, and a first support member that supports the first adsorption pad and that includes a first opening into which the illumination unit is inserted.

Abstract: Apparatuses, systems and methods associated with a nest device design are disclosed herein. In embodiments, a nest device may include a main body and one or more air bearings that extend from the main body. A placement mechanism may be positioned on ends of the one or more air bearings, wherein the placement mechanism includes the part. The one or more air bearings may blow air out of the ends of the air bearings against the placement mechanism when the air bearings are in a first state, and draw air in through the ends when the air bearings are in a second state. The nest device may further include one or more air jets that extend from the main body and are directed toward the placement mechanism, air blown by the one or more air jets causes the placement mechanism to be translated. Other embodiments may be described and/or claimed.

Abstract: A module connector for holding and/or transporting of bulk goods for connecting a first container module to a second container module, the container modules being joined together have an aligned container inner surface, a first seal arranged between the first container module and the second container module, a second seal arranged between the first container module and the second container module, the first seal is arranged in a recess and the second seal in a groove, the first seal forming an inner seal and the second seal forming an outer seal, the second seal produces a sealing of the interconnected container modules especially if the first seal fails, the first seal has at least one crimp region, which is crimped by a first and/or second flange surface such that one end face of the first seal is situated flush and/or aligned with the container inner surface without forming a cavity in the area of the end face of the first seal as well as a seal element for the module connector for the sealing of the conta

Abstract: Method and apparatus for air flow regulation comprise a vertically oriented conduit, a sail assembly positioned in the conduit and moveable therewithin responsively to air flow through the conduit to regulate rate of air flow through the conduit and to stop air flow through the conduit upon air flow rate through the conduit exceeding a preselected value with a detector for sensing when the sail assembly has stopped air flow thought the conduit as a result of air flow rate exceeding said pre-selected value.

Abstract: A robotic gantry system, end-effector for a robotic gantry system and method of transporting products using a robotic gantry system is provided. The end-effector includes a movable floor that can be positioned below picked products to prevent products from being dropped during transport. The movable floor also permits selecting individual rows of products from a given layer of products of a product stack. The end-effector may include a vacuum assembly for vacuum adhering to the products. The method permits selection of varying portions of a stack of products with the end-effector and protecting the selected portions of products using the movable floor.

Abstract: Examples of an alignment assembly for loading a shipping container are disclosed. In one example implementation according to aspects of the present disclosure, the alignment assembly includes a base rotatably disposed on a pole and an alignment bracket moveably connected to the base. The alignment bracket may include a main support member connected to an alignment member. The alignment bracket is configured to permit the alignment member to be disposed substantially co-planer with a sidewall of the shipping container.

Abstract: This invention relates to a control system and method for rotary car dumpers comprising a positioning car, silos and feeders. Such control system comprises three integrated and communicating controls in closed grid, that is, the positioning car control, the silos level control and the feeder flow control. In this way, with the data of these controls, the rotary car dumpers control system is configured to maintain the level of silo at maximum, performing changes in the cycle time by controlling the positioning car to maintain the level of silos and thus achieve maximum productivity of the equipment.

Abstract: A reloading supply system includes a loading cart (100) and a machine (200). The loading cart has a first material tray (120) that includes a first combed surface (122) configured to retain a supply material in the first material tray. The machine has a second material tray (220) that includes a second combed surface (222) configured to retain the supply material in the second material tray after the supply material is transferred from the first material tray of the loading cart to the second material tray of the machine. Teeth (124) of the first combed surface are configured to pass by teeth (224) of the second combed surface. The first combed surface and the second combed surface are configured such that the supply material in the first material tray is transferred to the second material tray as the teeth of the first combed surface pass by the teeth of the second combed surface.

Abstract: A sheet feeding device includes: a feeding unit that is provided to be movable in a forward-backward direction to move forward or backward relative to a sheet placing unit on which a sheet is placed, and feeds the sheet; a moving unit that moves the feeding unit in the forward-backward direction; a contact unit that is provided to be movable, with which the sheet placed on the sheet placing unit is brought into contact; a limitation unit that limits movement of the contact unit; and a releasing unit that, when the moving unit moves the feeding unit in a direction away from the sheet placing unit, with the movement of the feeding unit, releases limitation on the movement of the contact unit by the limitation unit.

Abstract: The present disclosure provides a feeder and a backlight production apparatus. The feeder includes: a storing assembly configured to store a material tray on which a plurality of elements to be fed are placed; a fetching assembly configured to obtain the material tray from the storing assembly by sucking and transport the material tray; a distributing assembly configured to obtain at least one element to be fed by sucking from the material tray transported by the fetching assembly, and distribute the at least one element to be fed; and a turn-over assembly configured to turn over the at least one element to be fed distributed by the distributing assembly, and transport the at least one element to be fed to a next process unit.

Abstract: A sheet transfer apparatus and a method for transferring a sheet using a sheet transfer apparatus are provided. A sheet transfer apparatus includes: a table on which two or more sheets, which are continuously laminated, are configured to be seated; a sheet adsorbing part on the table to adsorb a first sheet, which is at an uppermost portion, of the two or more laminated sheets at a pressure; and an air discharge part on the table and adjacent to the sheet adsorbing part, and the air discharge part is configured to discharge air to a surface of the first sheet adsorbed to the sheet adsorbing part.

Abstract: The medium conveying device, comprises (1) a feeder configured to feed a print medium in a conveyance direction; (2) a stacker configured to stack the print medium fed by the feeder; (3) a first guide arranged in downstream side of the print medium in the conveyance direction, the first guide including a first guide surface configured to guide a downstream edge of the print medium stacked on the stacker; and (4) a second guide arranged to be movable with respect to the first guide, the second guide including a second guide surface configured to guide the downstream edge of the print medium stacked on the stacker, wherein the second guide configured to move with respect to the first guide such that the second guide surface protrudes with respect to the first guide surface in an upstream direction as the stacked amount of the print medium stacked on the stacker decreases.

Abstract: An image forming apparatus includes a flag, a sensor, a loop controller, a detector, and an image controller. The flag is disposed between the first and second conveying units and moves when in contact with a recording material having a loop. A signal value output from the sensor varies per a flag position. The loop controller changes a recording material speed based on the signal value output. The detector detects the recording material or an image formed on the recording material and the image controller changes an image forming condition based on the detection. The detector includes first and second contacting members that move to nip the recording material. A position of the flag, for changing a signal value output from the sensor, is included in a range in which first and second contacting members are movable.

Abstract: A sheet conveying device includes a blocking member having a blocking surface with which a leading end of a sheet that is being conveyed comes into contact for obliquity correction. The blocking member is rotated by being pushed by the sheet against an urging force of a positioning unit that positions the blocking member to be in the standby position. The blocking member is rotatable to be in a sheet-passage-allowing orientation in which the sheet is allowed to pass. When a trailing end of the sheet that is being conveyed has passed the blocking member, the blocking member that is in the sheet-passage-allowing orientation rotates in a same direction as a sheet conveyance direction and is positioned to be in a standby position.

Abstract: Disclosed is a sheet conveying apparatus. The sheet conveying apparatus includes a conveying roller pair (58) for conveying a sheet, a registration roller pair (57) disposed downstream of the conveying roller pair (58) and a guide portion for guiding the sheet conveyed to the registration roller pair (57) by the conveying roller pair (58) such that the sheet is deflected. Further, the guide portion guides the sheet such that a number of deflection nodes changes according to stiffness of the sheet.

Abstract: A method for removing outer layer of rollstock includes: first step of cutting rollstock's outermost circumferential film in a first cut portion, the rollstock formed by a film sheet rolled from base end to tip end and the tip end temporarily fixed to an outer circumferential surface; second step of cutting the film in a second cut portion closer to the base end than the first cut portion, a length from the tip end to the second cut portion being equal to or more than one round of the rollstock's outermost circumference; and step of discarding a first cut-film piece from the first cut portion to the tip end and a second cut-film piece from the first cut portion to the second cut portion by drawing the first and second pieces with a drawing device while driving an unwinding roller mounted with a hollow portion of the rollstock to rotate.

Abstract: A method for cutting at least an outermost film of rollstock across a width direction of a film, the rollstock formed by a film sheet rolled from base end to tip end, the method including: separation step of generating a gap between the inner peripheral film and the outer layer by separating first edge portion of the outer layer from the inner peripheral film in a radial direction of the rollstock, in a state where the outer layer is remained to be rolled as a part of the rollstock; step of displacing a portion of the outer layer defining the gap in a first width direction from the first edge portion to second edge portion in the width direction; and step of cutting the outer layer across the width direction during the displacement step, while the first cutter is moved from the first edge portion to the second edge portion.

Abstract: A tape dispenser with a frame having top wall and opposed side walls. The top wall connects the opposed side walls. A tape mount is disposed on an interior surface of each of the side walls and is adapted to secure a roll of tape therebetween. A roll of adhesive tape is secured on the tape mount. A cutter blade is disposed on a forward region of the frame and is adapted to cut tape from the roll. A bar is disposed on an interior surface of one side wall and extends between greater than about 30% and less than about 90% of a distance between the opposed side walls. The bar has an upper surface receiving an adhesive side of the tape. A pressure pad is mounted on the frame adjacent the cutter blade.

Abstract: A controller of a sheet handling apparatus (for example, banknote handling machine) stops an operation of storing a sheet in a storage bag (for example, banknote storage bag) on the condition that the number of sheets (for example, banknotes) received by a number information receiver is less than a predetermined number, when a distance between a receiver (for example, each stage) and a presser (for example, pressing plate) that is pressing the sheets stored in a storage bag which is supported by a support (for example, each holding member), toward the receiver, is greater than a predetermined distance.

Abstract: A link coupler for coupling two lengths of different sized chain together and facilitating movement of the two lengths of different sized chain is provided. Also provided is an assembly of the link coupler with a dual chainwheel, a small chain, and a large chain. The link coupler includes a body, a small-chain link coupler coupled with the body at a first end of the body, and a large-chain link coupler coupled with the body at a second end of the body. The dual chainwheel includes a small wildcat profile and a large wildcat profile. The small chain is coupled with the small-chain link coupler, and the large chain is coupled with the large-chain link coupler.

Abstract: A reusable paper core including a cylindrical body having a circular outer periphery surrounding an open interior. The cylindrical body is configured to receive a roll of paper. The paper core includes at least one plate that spans at least a portion of the open interior such that the at least one plate connects at least two portions of the outer periphery. The at least one plate defines a non-circular central opening.

Abstract: An elevator safety system includes: at least two sensors, each of the sensors being configured for monitoring at least a portion of a hoistway of an elevator system and providing monitoring signals; a transformation unit which is configured for transforming the monitoring signals provided by at least one of the sensors and producing transformed signals corresponding to a common direction of vision; a comparison unit which is configured for comparing the at least two transformed signals and for generating a failure signal if a difference between the at least two transformed signals exceeds a predetermined threshold; and a detection unit, which is configured for detecting a person or undesired item in at least one of the two transformed signals and for generating an alarm signal if a person or undesired item is detected.

Abstract: A method for maintenance of an elevator in Shabbat mode, the method including providing a Shabbat elevator maintenance system, where the system is in communication with the elevator, detecting a malfunction in the elevator by the maintenance system, notifying a technician about the malfunction by the maintenance system, following repair of the elevator by a repairing technician, verifying by the maintenance system that the elevator has been repaired and that Shabbat mode has been reactivated, and activating remuneration for the repairing technician by the maintenance system.

Abstract: An elevator safety gear assembly for an elevator system comprises a first engagement member; a second engagement member; and a connector mechanically connecting the first and second engagement members with each other. The first and second engagement members are arranged opposite to each other defining a gap which is configured for accommodating a guide member extending in a longitudinal direction. At least one of the engagement members is movable in a direction which is inclined with respect to the longitudinal direction. The first engagement member is pivotably coupled to the connector by means of a first joint, and the second engagement member is pivotably coupled to the connector by means of a second joint. At least one of the joints is movable along the connector for changing the distance between the first and second joints.

Abstract: A lifting apparatus and method. The lifting apparatus comprising a lower bar assembly, an upper frame assembly, and a plurality of straps. The lower bar assembly comprises a first bar and a second bar. The upper frame assembly comprises a first upper frame bar, a second upper frame bar substantially parallel to the first upper frame bar, and a cross piece connecting the first upper frame bar to the second upper frame bar and substantially perpendicular to the first upper frame bar and the second upper frame bar. The plurality of straps are fixedly attached to the lower bar assembly and slidably attached to the upper frame assembly.