Abstract: A system includes a patient support and an outer gantry on which an accelerator is mounted to enable the accelerator to move through a range of positions around a patient on the patient support. The accelerator is configured to produce a proton or ion beam having an energy level sufficient to reach a target in the patient. An inner gantry includes an aperture for directing the proton or ion beam towards the target.

Abstract: A radiotherapy system comprising a plurality of particle beam sources (1a, 1b, 1c) arranged to radiate particle beams (6a, 6b, 6c) on a three-dimensional radiation target (3) located inside the body of a radiotherapy patient (4), the position in space and alignment of which particle beam sources are individually controllable; and an imaging system (2) arranged to monitor the position and orientation in space of the three-dimensional radiation target including direction and speed of any movement of the radiation target, and also to monitor tissue characteristics of body tissue (5) surrounding the radiation target located in the radiation paths of the particle beams.

Abstract: Apparatus is provided for assessing a characteristic of a first acoustic field (22) at a first frequency in a region (24) of a medium (26), the first acoustic field generating oscillatory motion of scatterers (28) disposed within the medium, at the first frequency. An acoustic transducer (30) (a) generates a second acoustic field (32) at a second frequency in the region, the second frequency being higher than the first frequency, and (b) receives echo data of the second acoustic field scattering off the oscillating scatterers in the medium, the echo data containing Doppler-shifted frequencies related to the oscillations of the scatterers, resulting in a time-dependent Doppler shift that oscillates at a frequency that is related to the first frequency. Control circuitry (36) (a) extracts the oscillating time-dependent Doppler shift from the received echo data, and (b) converts the extracted Doppler shift into particle-velocity of the first acoustic field.

Abstract: Methods and devices are described which allow sound waves to be safely be applied to the eyelid of an eye of a patient or through the eyelid to other structures in the eye or to or through structures in the facial region to effect changes to one or more structures in and around the eye or directly through the cornea or sclera to regions of the eye to treat one or more diseases of the eye.

Abstract: Apparatus and methods for creating tissue necrosis include an energy delivery apparatus that can be positioned adjacent a target treatment site such as a vessel without direct contact with the treatment site tissue. Collimated energy is then directed to the vessel to create necrotic regions in the tissue. Exemplary use in renal vessels creates necrotic regions in adjacent nerves which can alleviate hypertension in a patient.

Abstract: A velocity control device for controlling the velocity of a load on a flexible tension member. The device can include a chassis having a chassis peripheral surface, with a portion of the chassis peripheral surface defining an exit aperture. The device can also include a capstan, the capstan having a proximal face joined to the chassis and a distal face separated at a distance from the proximal face. A peripheral capstan surface can be tapered from a greatest diameter near the distal face to a smallest diameter near the proximal face. The device can include a throttle, the throttle being attached to the chassis. The throttle can an interior surface defining an opening through which the tension member can pass with the interior surface being in at least partial contact with the tension member. Heat produced by kinetic energy in the flexible tension member is transferred to the throttle, and the change in system internal energy produces work in the form of a drag force on the flexible tension member.

Abstract: A device, composition, and a process for a hybrid blend of inert gas and mist produced for fire protection by local or total flooding. The method mixes ultrafine water mist, preferably less than 20 microns diameter produced by atomization and an inert gas such as nitrogen. A homogeneous hybrid composition discharges from a swirling flow mixer-injector device. The hybrid composition extinguishes a fire source in reduced time by simultaneous and synergistic cooling with the mist and inerting with the inert gas. After extinction oxygen remains at a safe level of 12.5-15% (V). The high-velocity inert gas flow of 35-75 mph velocity in the mixing-injector column formed by an exit in the mixer-injector device entrains the low-velocity mist flowing out of atomizer. The device creates a swirling, high-speed, and expanding flow of the hybrid composition inside the fire protection volume at ambient pressure.

Abstract: The invention concerns a fire extinguishing device (1; 1?) for installation in a room (200) and for fighting fires in a plurality of sectors of the room, comprising a housing (7) having an extinguishing fluid inlet (3), wherein the housing has a plurality of extinguishing fluid outlets (5a-f) connected fluidically to the extinguishing fluid inlet. According to the invention it is proposed that the extinguishing fluid outlets (5a-f) are adapted to discharge an extinguishing fluid along a respective individual extinguishing fluid trajectory (101a-f), are oriented fixedly on the housing in such a way that the extinguishing fluid trajectories from the extinguishing fluid outlets cover respectively different sectors (203a-f) of the room, and associated with the extinguishing fluid outlets is a respective control member (17a-f) for selectively opening or closing the connection between the extinguishing fluid inlet and the extinguishing fluid outlet.

Abstract: A fire detection system and method for fire detection are provided. The fire detection system includes at least one light emitting device for emitting light in a two-dimensional arrangement having multiple optical paths. The fire detection system further includes at least one light detection device for outputting respective light detection signals responsive to detecting the emitted light in each of the multiple optical paths of the two-dimensional arrangement. The fire detection system also includes a controller for identifying an abnormal condition relating to an early fire condition and initiating a set of fire sprinklers responsive to the respective light detection signals.

Abstract: Disclosed is a valve assembly for a fire suppression system, the valve assembly having: a valve armature having a top portion and a bottom portion spaced from the top portion along a longitudinal axis, the bottom portion including an armature cavity that includes a cavity inlet for receiving fluid and a cavity outlet proximate a bottom portion of the cavity for delivering fluid, a plunger slidable along the longitudinal axis within the armature cavity, between a closed state and an open state, wherein: in the closed state the plunger is at a predetermined bottom position in the armature cavity proximate the cavity outlet for fluidly sealing the cavity outlet; and in the open state the plunger is in a predetermined top position in the cavity distal the cavity outlet, and a monitoring system operatively connected to the valve armature, the monitoring system acoustically sensing whether the plunger is longitudinally misaligned.

Abstract: A massage and stretch bench includes: a body with a top plate and a plurality of supports, the top plate including a first positioning hole opening in a vertical direction, and each of the supports being mounted on the bottom surface and provided with an opening; a baseplate inserted along the horizontal direction into the openings of the plurality of supports and having a second positioning hole which is aligned with the first positioning hole and opens in the vertical direction; an upright post inserted along the vertical direction into the first and second positioning holes; and a footrest including a first footrest piece, a second footrest piece and two connecting pieces connected between the first and second footrest pieces so as to define a baseplate-insertion slot which opens in the horizontal direction, and the baseplate is inserted in the baseplate-insertion slot.

Abstract: Disclosed is a rehabilitation training apparatus. The rehabilitation training apparatus includes a pair of first tracks formed parallel to each other along first axis, a second track disposed on the pair of first tracks, and moving along the first axis, and formed along second axis, a hand holder disposed on the second track, and moving along the second track, and on which at least one of hand and arm of a user is held, a stopper for a track disposed on the pair of first tracks for limiting a movement range of the second track, and a stopper for a holder disposed on the second track for limiting a movement range of the second pair of first tracks, wherein the first axis and the second axis are disposed with an inclination.

Abstract: A weight object configured to be lifted from a ground surface includes a first portion made of high-durometer material, a second portion made of elastomeric material having lower durometer than the first portion, and a handle for holding the weight object and lifting the object from the ground surface, where the second portion includes spaced holes within the elastomeric material for absorbing noise generated when the weight object is dropped on the ground surface. Alternatively, a weight object is disclosed which is configured to be lifted from a ground surface, comprising at least one layer of elastomeric material having spaced holes therein for absorbing noise generated when the weight object is dropped on the ground surface, and an opening configured to receive a handle.

Abstract: A body alignment and correction device for use by a human user includes a belt for wearing about the user's waist and having a front and a back, an outer surface facing away from the user's body, an inner surface facing toward the user's body, and fastening means at the front for fastening said belt around the user's body; and includes a shoulder system having a shoulder strap, connection means for connecting the belt to the shoulder strap and to a pull cord fixable to an external object, the shoulder being strap configured to extend around the user's shoulders.

Abstract: An exercise apparatus that includes a handle frame and a base frame.

Abstract: Provided is an exercise device including a planar support surface and a rolling joint which is configured to enable a 360° range of motion for the exercise device. In this regard, the user may roll the exercise device along a planar surface in a forward-and-backward motion, a side-to-side motion, or in an arcuate or circular motion.

Abstract: Described herein are embodiments of stationary exercise machines having reciprocating foot and/or hand members, such as foot pedals that move in a closed loop path. Some embodiments can include reciprocating foot pedals that cause a user's feet to move along a closed loop path that is substantially inclined, such that the foot motion simulates a climbing motion more than a flat walking or running motion. Some embodiments can further include reciprocating handles that are configured to move in coordination with the foot via a linkage to a crank wheel also coupled to the foot pedals. Variable resistance can be provided via a rotating air-resistance based mechanism, via a magnetism based mechanism, and/or via other mechanisms, one or more of which can be rapidly adjustable while the user is using the machine.

Abstract: A multi-axis adjustable exercise machine which is pivotable about both a pitch axis and a roll axis with respect to a base for allowing an exerciser to perform a wide range of exercises on a pitched or rolled exercise machine. The multi-axis adjustable exercise machine generally includes an exercise machine which is adjustable with respect to a base. The exercise machine may be pivoted about a roll axis to adjust the roll angle of the exercise machine or may be pivoted about a pitch axis to adjust the pitch angle of the exercise machine. One or more actuators may be connected between the base and the exercise machine to effectuate the pivoting of the exercise machine about either or both axes with respect to the base.

Abstract: An exercise apparatus having a pulley, a pair of stabilizing assemblies each configured to couple a front portion of a respective pedal element to each side of the pulley, a looped belt configured to couple the pulley to a resistance assembly, a tension stabilizer configured to maintain a tension of the looped belt on the pulley, and the resistance assembly configured to assert an adjustable resistance to the pedal elements through the looped belt. The exercise apparatus also comprises a resistance band extension for performing additional exercise using resistance bands and a transport mechanism for transporting the exercise apparatus and securing the exercise apparatus to a chair wheel or other structure during exercise.

Abstract: An elliptical trainer includes a base frame, a front upright frame mounted at the front side of the base frame, a transmission device set mounted at the front upright frame, a guide rail device set including a guide rail seat pivotally connected with its rear side to the rear side of the base frame, an upper support unit affixed to the front side of the guide rail seat and a lower support unit pivotally connected to the front side of the guide rail seat and biasable up and down relative to the front side of the guide rail seat, a retractable device set pivotally connected between the upper support unit and the lower support unit, and a pedal device set connected to the transmission device set and slidably supported on the guide rail seat.

Abstract: A fitness tracking system for generating movement variables corresponding to movement of a user includes a monitoring device, a personal electronic device, and a remote processing server. The monitoring device is configured to be worn or carried by the user and includes a movement sensor configured to collect movement data. The personal electronic device is operably connected to the monitoring device. At least one of the personal electronic device and the monitoring device is configured to calculate feature data by applying a set of rules to the movement data, to calculate raw speed data corresponding to a speed of the user from the subset of the movement data, and to calculate raw distance data corresponding to a distance moved by the user from the subset of the movement data. The remote processing server includes a machine learning model for processing at least the feature data.

Abstract: An athletic parameter measurement device worn by an athlete during an athletic activity session includes a housing which attaches to the athlete, a display, a processor associated with the display, and an athletic parameter measurement sensor. During the athletic activity, the device detects, using the sensor, a vertical jump height of the athlete, and displays, during the performance of the athletic activity session, a representation of the vertical jump height on the display.

Abstract: The present disclosure generally relates to navigating, viewing, and sharing activity and workout data and interacting with workout and/or activity applications. In some examples, scrolling of activity data is based on the content being displayed. In some examples, friends' activity data may be viewed. In some examples, a notification and workout data for a friend's completed workout is received and displayed. In some example, the activity data received from friends is viewed and managed. In some examples, workout data for a multi-segment workout is displayed in a three-dimensional stack on a map. In some examples, a workout application operates in a limited mode until a touch input is received with a characteristic intensity that is greater than a threshold intensity.

Abstract: The present disclosure generally relates to navigating, viewing, and sharing activity and workout data and interacting with workout and/or activity applications. In some examples, scrolling of activity data is based on the content being displayed. In some examples, friends' activity data may be viewed. In some examples, a notification and workout data for a friend's completed workout is received and displayed. In some example, the activity data received from friends is viewed and managed. In some examples, workout data for a multi-segment workout is displayed in a three-dimensional stack on a map. In some examples, a workout application operates in a limited mode until a touch input is received with a characteristic intensity that is greater than a threshold intensity.

Abstract: A treadmill includes a deck, a first pulley disposed in a first portion of the deck, a second pulley disposed in a second portion of the deck, a tread belt surrounding the first pulley and the second pulley, and a platform incorporated into the deck.

Abstract: The invention relates to a system and method for measuring the biomechanical state of a subject using various sensors simultaneously with providing the subject with visual exercises for rehabilitation and assessment of disequilibrium, balance and motion disorders. The biomechanical state of a subject is measured during the subject's performance of a predetermined task. Such measurements are useful for the assessment of disequilibrium, balance and motion disorders and are also useful for the determination of therapeutic application of vibrotactile, auditory, or visual feedback to a subject during the subject's attempt to perform a predetermined task. An intelligent controller compares the subject's biomechanical state to a predetermined parameter to determine a variance. If the variance exceeds a threshold, feedback in the form of visual feedback, vibrotactile feedback or auditory feedback may be provided to the subject as a therapeutic means for enabling the subject to compensate for disorder effects.

Abstract: A wearable safety feature used to protect users from injuries caused by impact or collision. More specifically, a wearable safety feature having alternating solid free space and open cells that can be used on its own or in combination with additional protective equipment. A layer of open, pillar-shaped cells can be alternated with solid material and can have apertures exposed to an inner or outer surface of the safety feature or piece of protective equipment. A hard, outer shell can be placed over the safety feature so that the safety feature is located between the hard, outer shell and the wearer.

Abstract: Golf ball comprising dimple(s) incorporating three or more linear channels having the same channel length L and same channel width CW; all linear channels extend radially outward from a centroid of the dimple toward a perimeter of the dimple without intersecting the dimple's centroid. Each linear channel may extend radially outward from a location on the dimple that is a distance Cd from the dimple's centroid, wherein Cd>0. Alternatively, at least one of the three or more linear channels has a different channel length L and/or a different channel width CW than at least one other linear channel. Dimple may have circular or non-circular plan shape; channels may not intersect each other; at least one linear channel may intersect the dimple's perimeter; and linear channels may be spaced by n separation angles ?S, wherein n is number of linear channels, which may be equal, or at least two differ.

Abstract: Golf balls having covers made of thermoplastic polyurethane compositions are provided. Multi-piece golf balls can be made. Polyurethane primer coatings and polyurethane top-coatings are applied to the thermoplastic polyurethane cover. Different coating methods can be used. Isocyanate-rich and polyol-rich polyurethane coatings can be applied. In one embodiment, the golf ball can be treated with a multi-functional isocyanate prior to applying the coatings. The polyurethane cover composition and surface coatings can further include catalysts, ultraviolet (UV)-light stabilizers, and other additives. Heat is used to cure the coatings. The coating methods have many benefits and the finished balls have good physical properties.

Abstract: A golf ball includes a spherical core and a cover positioned outside the core. The core has an inner layer and an outer layer positioned outside the inner layer. The inner layer is obtained by crosslinking a rubber composition. The rubber composition of the inner layer includes a butyl-based rubber as a base rubber. The inner layer has a diameter Di of not less than 10 mm and not greater than 34 mm. A difference (H2?H0) between a Shore C hardness H2 at a surface of the outer layer and a Shore C hardness H0 at a central point of the inner layer is less than 35. Preferably, the butyl-based rubber is a polymer including an isobutylene unit and an isoprene unit, and a derivative thereof.

Abstract: An iron golf club head comprises; a head main body including a club face provided with score lines; a weight member having a specific gravity larger than that of the head main body; and a fixing member having a specific gravity larger than that of the head main body and less than that of the weight member, and fixed to the head main body by welding so as to cover the weight member. In a forward tilting state of the club head in which the score lines are horizontal and the club face is vertical, the distance D in the perpendicular direction to the club face from the backmost position of the club head to the center of gravity of the weight member is not more than 47.3% of the maximum thickness W of the club head which is the shortest distance from the backmost position of the club head to the club face.

Abstract: A golf club includes a shaft and a club head. The club head includes a body member having a ball striking face, a heel, a toe, a back, a crown, a sole, and a hosel region located at the intersection of the ball striking face, the heel and the crown. The sole includes a channel extending from the hosel region toward the toe. An insert is received within the channel. The club head further includes means for detachably securing the insert to the channel. A second insert configured for being received within the channel may be provided.

Abstract: Some disclosed golf club heads include body having at least one raised sole portion and a cantilevered ledge extending down around a perimeter of the club head below the level of the raised sole portion. Some disclosed golf club heads include one or more sole openings in the body and a sole insert that is mounted inside the body over the sole openings. The sole can include weight tracks as well, and a rear weight track can extend between a toe side sole opening and a heel side sole opening. A crown insert can also be included that is mounted over an upper opening in the body.

Abstract: A golf club head is provided with an electronic display that is visible to a user of the golf club head when the golf club head is in the address position, such as for displaying one or more images to the user. The electronic display may include a memory, a microprocessor, and a battery, and may be configured to communicate with a user operable electronic device via a wired or a wireless communication protocol. For example, the electronic display may be configured to receive one or more images from the user operable electronic device, to store the one or more images in the memory, and to display the one or more images to the user.

Abstract: Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head may include a body portion and a plurality of weight portions. The body portion may include a front portion, a rear portion, a toe portion, a heel portion, a top portion, and a bottom portion having a plurality of ports. The plurality of ports may include a first set of ports and a second set of ports. Each port of the plurality of ports may be configured to receive a weight portion of the plurality of weight portions. Other examples and embodiments may be described and claimed.

Abstract: Iron-type golf club heads are disclosed having a heel portion, a sole portion, a toe portion, a top-line portion, a front portion, a rear portion, and a striking face. The iron-type golf club heads include a localized stiffened region that is located on the striking face of the club head such that the localized stiffened region alters the launch conditions of golf balls struck by the club head in a way that wholly or partially compensates for, overcomes, or prevents the occurrence of a rightward deviation. In particular, the localized stiffened region is located on the striking face such that a golf ball struck under typical conditions will not impart a right-tending sidespin to the golf ball.

Abstract: Embodiments of golf clubs and methods to manufacture golf clubs are generally described herein. In one example, a golf club may include a golf club head having an interior cavity and a shaft attached to the golf club head. At least a portion of the shaft may be filled with an elastic polymer material, and the interior cavity may be at least partially filled with an elastic polymer material. Other examples and embodiments may be described and claimed.

Abstract: Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head may include a body portion with a toe portion, a heel portion, a top portion, a sole portion, a back portion, and a front portion. The golf club head may include an interior cavity. The interior cavity may be filled with an elastic polymer material. Other examples and embodiments may be described and claimed.

Abstract: Embodiments of golf club heads and methods to manufacture golf club heads are generally described herein. In one example, a golf club head may include a body portion with a face portion, a toe portion, a top portion, a sole portion, and a back portion with at least one weight portion. The golf club head may include an interior cavity. The golf club head may include face markings on the face portion that include a first set of markings extending between the toe portion and the heel portion and a second set of markings extending between the top portion and the sole portion. Other examples and embodiments may be described and claimed.

Abstract: Golf club heads with cavities and inserts, and methods to manufacture golf club heads with cavities. Various embodiments include a golf club head comprising a body. The body comprises a strikeface at a front of the golf club head, a backface opposite the strikeface, a heel region, a toe region opposite the heel region, a sole, a rear portion at a rear of the golf club head, and a cavity located between the backface and the rear portion. In many embodiments, the body further comprises an insert within the cavity.

Abstract: A golf club head includes a metallic front body coupled with a rear body to define a substantially hollow structure. The metallic front body includes a strike face and a surrounding frame that extends rearward from a perimeter of the strike face. The rear body includes a crown member and a sole member coupled to the crown member. The sole member comprises a structural layer formed from a filled thermoplastic material and a fiber reinforced composite resilient layer bonded to an external surface of the structural layer. The structural layer includes a plurality of apertures extending through a thickness of the structural layer, and the resilient layer extends across each of the plurality of apertures. The structural layer and the resilient layer each include a common thermoplastic resin component, and are directly bonded to each other without an intermediate adhesive.

Abstract: A golf club head comprising a body and a stiffening structure is disclosed herein. The body comprises a face section, a sole section, and a crown section, and defines a hollow interior. The stiffening structure extends within the hollow interior from the crown section to the sole section to reduce stresses placed on the face section during impact with a golf ball. The stiffening structure is entirely located within 0.500 inch of a rear surface of the face section measured along a plane normal to the center of the face, and within 1 inch of the center of the face section along a horizontal axis parallel to the face section, and comprises heel and toe connectors connected to one another by a middle connector, such that the stiffening structure has an approximately X- or H-overall shape.

Abstract: A multi-material golf shaft having a butt portion joined to a tip portion and possessing unique relationships, including rigidity relationships, which provide beneficial performance characteristics including improved stability.

Abstract: The disclosure herein includes a grip and a method of making a grip configured to be grasped by a user. The grip can include a tube with a raised portion that is configured to form a portion of the surface to be grasped by the user. The grip can further include a gripping member that can be coupled to the tube leaving a portion of the raised portion exposed such that the surface to be grasped by the user includes both the raised portion and the gripping member.

Abstract: The Golf Club Carrier On a Wheel provides the golfer, who wishes to walk and have 14 clubs available at all times to select and replace, an opportunity to do so without a undo strain. The carrier is uniquely designed to have the center of gravity of the clubs and carrier on the wheel; therefore, the golfer does not have to push or pull the weight of the carrier and clubs. As a result the golfer is free to enjoy the round without physical strain. Mental strain is another story.

Abstract: An example accessory holder includes a first clip member, a second clip member, and a third clip member. The second clip member is pivotally connected to the first clip member. Each of the clip members are biased in a closed position, and each of the clip members have teeth. The first clip member has a substantially U-shaped body formed by a single member having a first end meeting a second end. An attachment opening is formed through the second clip member. A coil line is connected on one end to the attachment portion of the second clip member. The coil line is connected on another end to the third clip member.

Abstract: A lacrosse head for a lacrosse stick is provided. The lacrosse head has an open frame having a rearward base, a scoop opposing the base, and a pair of sidewalls extending between the base and the scoop. The lacrosse head has a throat portion projecting rearward from the open frame for receipt of a lacrosse handle element therein so as to define a head/handle axis projecting forwardly of the throat portion. The open frame has a plurality of holes for securing a lacrosse net along a back side of the frame, leaving an opposing front side of the frame open for receiving a lacrosse ball. Each of the pair of sidewalls has a bottom portion and a top portion. Each of the bottom edge of the sidewalls angles to the right. The bottom edge of the left sidewall angle inwardly and the bottom edge of the right angles outwardly, in relationship to the top edge of the sidewalls. The distance between each sidewall stays the same distance or gets wider than the distance between the top edge of the sidewalls.

Abstract: A golf club head has a body having a ball striking face, a rear opposite the ball striking face, a crown, a sole, a heel, and a toe, the body having a void defined by a peripheral edge on the sole. The body further defines a cover that extends over the void and forms at least a portion of the crown. At least a portion of the peripheral edge of the void includes a lip extending from the peripheral edge inwardly into the void. The golf club head may additionally or alternately include one or more weight receptacles connected to the sole and having an opening in the sole, such that each weight receptacle is configured to receive insertion of a weight through the opening.

Abstract: A portable game includes a lower table forming a circular playing surface and an edge having a diameter D1, an upper table forming a circular playing surface and an edge having a diameter D2, wherein D1>D2. A vertical support member interconnects the lower and upper tables. Both playing surfaces include an inner circular hub line extending about the center of the respective playing surfaces, and a plurality of radially directed rays formed on the respective playing surfaces. Each ray is circumferentially equally spaced from each immediately adjacent ray, wherein each pair of adjacent rays defines a trapezoidal play segment extending between the edge and hub line. An outer cup positioning marker is centrally formed in each play segment at a common radial distance from the edge, and an inner cup positioning marker is centrally formed in each play segment at a common radial distance from the hub line.

Abstract: A tackle training system defines a frame configured for attachment to a player's body. The frame has an upper portion, a lower portion, and a center portion extending therebetween. The upper portion defines at least one attachment structure extending downwardly toward the lower portion, and the lower portion defines at least one attachment structure extending upwardly toward the upper portion generally vertically aligned with the attachment structure of the upper portion. The opposing attachment structures are for contacting opposing ends of a bar so as to removably attach and extend the bar between the upper and lower portions. The attachment structures of the frame limit movement of the removable bar generally to that of the frame and allow release of the removable bar from the frame when a force that overcomes an attachment force provided by the attachment structures is applied to the removable bar.