Patent Publication Number: US-11642278-B2

Title: Combination emergency wash and faucet unit

Description:
TECHNICAL FIELD 
     The present disclosure relates generally to plumbing fixtures. More specifically, the present disclosure relates to faucets and emergency wash units. 
     BACKGROUND 
     Emergency wash units include emergency eyewash units, emergency facewash/eyewash units, and a combination of these systems. Emergency eyewash or emergency facewash units are designed to provide fluid, such as water, to a focused region of a person such as their eyes and/or face. Emergency wash units are conventionally installed above a sink or basin to manage the drainage of fluid expelled by the systems and any contaminants washed away from a user of the system. In some cases, these sinks include faucets capable of providing a fluid, such as water, to wash the hands or arms of a person or other objects or to fill vessels such as buckets, pots, or beakers. These faucets can supply water at various temperatures and flow rates. 
     SUMMARY 
     At least one embodiment relates to a combination emergency wash and faucet unit. The unit includes a base, an emergency wash arm pivotally coupled to the base, and a spout pivotally coupled to the base. The emergency wash arm includes an emergency wash unit that is rotatable relative to the base about a first vertical axis. The spout is rotatable relative to the base about a second vertical axis. The first vertical axis is offset from the second vertical axis. 
     Another embodiment relates to a combination emergency wash and faucet unit. The unit includes a base defining a first stop surface, an emergency wash arm pivotally coupled to the base, a spout pivotally coupled to the base and rotatable relative to the base about an axis, a rotation control member rotationally coupled to the emergency wash arm, the rotation control member defining a second stop surface, and a stop protrusion coupled to the spout. The emergency wash arm includes an emergency wash unit and is repositionable between a stored position and an active position. The stop protrusion is configured to (a) limit rotation of the spout in a first direction when engaging the first stop surface and (b) limit rotation of the spout in a second direction when engaging the second stop surface. Rotation of the emergency wash arm between the stored position and the active position causes a corresponding movement of the second stop surface relative to the first stop surface. 
     Another embodiment relates to a combination emergency wash and faucet unit. The unit includes a base including a main body configured to be coupled to a sink and a hub pivotally coupled to the main body, the hub defining a surface. An emergency wash arm is coupled to the hub, the emergency wash arm including an emergency wash unit configured to dispense a first fluid. The emergency wash arm is repositionable between an active position and a stored position. A spout is coupled to the main body and configured to dispense a second fluid. A first valve assembly is coupled to the main body and includes a valve element that is repositionable between (a) a sealed position in which the first valve assembly prevents or substantially prevents the second fluid from being dispensed from the spout and (b) an open position in which the first valve assembly permits the second fluid to be dispensed from the spout. The first valve assembly engages the surface such that surface moves the valve element from the open position to the sealed position when the emergency wash arm is moved from the stored position to the active position 
     This summary is illustrative only and is not intended to be in any way limiting. Other aspects, inventive features, and advantages of the devices or processes described herein will become apparent in the detailed description set forth herein, taken in conjunction with the accompanying figures, wherein like reference numerals refer to like elements. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
         FIG.  1    is a front, right perspective view of a combination emergency wash and faucet system with the emergency wash in an active position, according to an exemplary embodiment. 
         FIG.  2    is a front view of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  3    is a rear view of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  4    is a right side view of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  5    is a left side view of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  6    is a top view of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  7    is a front, right perspective view of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  8    is a front, right perspective view of the combination emergency wash and faucet system of  FIG.  1    with the emergency wash in a stored position. 
         FIG.  9 A  is a front, right perspective view of the combination emergency wash and faucet system in a left-handed configuration with the emergency wash in an active position. 
         FIG.  9 B  is a front, right perspective view of the combination emergency wash and faucet system in a left-handed configuration with the emergency wash in a stored position. 
         FIG.  10 A  is a front, right perspective view of a combination emergency wash and faucet system in a left-handed configuration, according to an exemplary embodiment. 
         FIG.  10 B  is a front, right perspective view of a combination emergency wash and faucet system in a right-handed configuration, according to an exemplary embodiment. 
         FIG.  11    is a front, right perspective view of a combination emergency wash and faucet system including a eye/face wash, according to an exemplary embodiment. 
         FIG.  12    is a front, right perspective view of the combination emergency wash and faucet system of  FIG.  11   . 
         FIG.  13    is a front, right perspective view of a body of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  14    is a front view of the body of  FIG.  13   . 
         FIG.  15    is a front view of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  16    is a section view of the combination emergency wash and faucet system of  FIG.  1    along the line B-B of  FIG.  15   . 
         FIGS.  17 - 19    are various exploded views of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  20    is an exploded view of a disc valve assembly of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  21    is a top section view of the disc valve assembly of  FIG.  20   . 
         FIG.  22    is an exploded view of a spool valve assembly of the combination emergency wash and faucet system of  FIG.  1   . 
         FIG.  23    is a section view of the combination emergency wash and faucet system of  FIG.  1    along the line A-A of  FIG.  14   . 
         FIG.  24    is a top view of a wash gear of the combination emergency wash and faucet system of  FIG.  1    in an active position of a right-handed configuration. 
         FIG.  25    is a top view of the wash gear of  FIG.  24    in a stored position of the right-handed configuration. 
         FIG.  26    is a top view of the wash gear of  FIG.  24    in an active position of a left-handed configuration. 
         FIG.  27    is a top view of the wash gear of  FIG.  24    in a stored position of the left-handed configuration. 
         FIG.  28    is a top view of a spout gear of the combination emergency wash and faucet system of  FIG.  1    in a first position and in a right-handed configuration. 
         FIG.  29    is a top view of the spout gear of  FIG.  28    in a second position and in the right-handed configuration. 
         FIG.  30    is a top view of a spout gear of the combination emergency wash and faucet system of  FIG.  1    in a first position and in a left-handed configuration. 
         FIG.  31    is a top view of the spout gear of  FIG.  28    in a second position and in a left-handed configuration. 
     
    
    
     DETAILED DESCRIPTION 
     Before turning to the Figures, which illustrate certain exemplary embodiments in detail, it should be understood that the present disclosure is not limited to the details or methodology set forth in the description or illustrated in the Figures. It should also be understood that the terminology used herein is for the purpose of description only and should not be regarded as limiting. 
     As used herein, the term “emergency wash fixture” or “emergency wash unit” means an eyewash, a facewash, or combination eyewash/facewash. Therefore and although certain embodiments presented herein are described as including an eyewash that directs streams of water towards the eyes of a person, it should be understood that the eyewash may be replaced with a facewash or a combination eyewash/facewash that directs water to a larger area of the face. 
     As used herein, the term “valve” means a device, assembly, or system that controls the flow of a fluid by opening, closing, or partially obstructing fluid communication paths. A “valve” may be actuated by a hydraulic system, a pneumatic system, manually (i.e., by hand), a solenoid, a motor, or other means. Furthermore, a “valve” may include/be structured as different types of valves including, but not limited to, a ball, butterfly, choke, diaphragm, gate, globe, knife, needle, pinch, piston, plug, solenoid, spool, or any other type of valve. Therefore and although certain embodiments presented herein are described as including a particular type of valve with a specific actuation path, it should be understood that the particular valve and actuation combination may be replaced by other types of valve and actuation combinations in other embodiments. 
     Emergency wash units are conventionally installed above a sink or basin to manage the drainage of fluid expelled by the systems and any contaminants washed away from a user of the system. In some cases, these sinks include faucets capable of providing a fluid. The faucets are typically centrally located on the sink, while the emergency wash units are located off to the side of the sink, separate from the faucet(s). This placement of the emergency wash unit is beneficial, as it prevents the emergency wash unit from obstructing the normal use of the faucet. However, this placement brings a number of disadvantages. When using the emergency wash unit, the person moves their head above an outlet of the eyewash and/or facewash. However, the faucet may interfere with the placement of the user&#39;s head especially if the vision of the person is impaired due to the presence of contaminants in their eyes. When the eyewash and/or facewash is moved over the sink, the outlets of the emergency wash unit remain offset toward the side of the sink, increasing the potential for water from the emergency wash unit to spray beyond the boundaries of the sink. Further, the eyewash and/or facewash takes up a significant amount of space along the perimeter of the sink. Additionally, this placement requires one or more additional holes through a support surface surrounding the sink to facilitate routing of hoses to the emergency wash unit. 
     Referring generally to the Figures, various embodiments disclosed herein relate to a combination emergency wash and faucet unit, system, or fixture. According to the present disclosure, the fixture includes both an emergency wash arm and a faucet (e.g., a spout assembly). The faucet dispenses water for routine washing or filling tasks, such as washing one&#39;s hands or filling a container with water. Water dispensed from the faucet may have a variable temperature or flow rate controlled by a user. The emergency wash arm is configured to be activated in an emergency or other desired situation to spray water towards a person to wash a substance from their eyes or face. Water dispensed from the emergency wash arm is lukewarm or tepid (e.g., between 50° F. and 110° F.) and directed towards the eyes or face of a person. In one embodiment and as primarily described herein, the emergency wash arm and the faucet are configured to be used alternately such that the emergency wash arm and the faucet are not activated at the same time. 
     The fixture includes a faucet having a spout, a base, and the emergency wash arm, which includes an emergency wash unit. The emergency wash arm and the spout are each pivotally coupled to the base. The base is fixed relative to (e.g., fixedly coupled to) a sink. When using the faucet, the spout is rotated to an active position over the sink, and the emergency wash arm is rotated to an inactive or stored position away from the active position of the spout. When the faucet is in use, the water flow rate and temperature are controlled by the user (e.g., by interacting with one or more valves, sensors, etc.). To use the emergency wash arm, the user applies a force to rotate or otherwise move the emergency wash arm to the active position over the sink. 
     The fixture includes a coupling mechanism (e.g., a gear train) that rotationally couples the emergency wash arm to the spout in certain positions. When the emergency wash arm is in a stored position, the spout may be free to rotate without causing a corresponding rotation of the emergency wash arm. Rotation of the emergency wash arm from the stored position to the active position causes the spout to move or rotate concurrently and in the same direction to a stored position. Similarly, when the spout is rotated by the user from a stored position to an active position, the emergency wash arm is driven to rotate in the same direction from the active position towards the stored position. In some embodiments, the stored position angle of the spout (e.g., the angle between the stored position of the spout and a central position) is different than the stored position angle of the emergency wash arm. The stored position of the inactive device (e.g., either the faucet spout or the emergency wash arm) is located away from the active device advantageously providing the user access to the active device without interference from the inactive device. 
     In one configuration, the spout of the combination emergency wash and faucet system is positioned to the left of the emergency wash arm when in the stored position (i.e., the combination emergency wash and faucet system is configured for use with a right hand of a user, referred to herein as a right-handed configuration). In another configuration, the spout is positioned to the right of the emergency wash arm when in the stored position (i.e., the combination emergency wash and faucet system is configured for use with a left hand of a user, referred to herein as a left-handed configuration). The fixture can be easily reconfigured between the right-handed configuration and the left-handed configuration without requiring any additional parts. 
     The combination emergency wash and faucet system may include two valve control handles (e.g., a user interface) configured to control the flow rate and temperature of a fluid (e.g., water) when the faucet is in use. In this arrangement, one handle may control the hot fluid flow rate, and the other handle may control the cold fluid flow rate. The hot fluid and the cold fluid are then combined and directed to an inlet of the spout. In a different embodiment, the fluid flow rate and temperature of the fluid expelled from the spout are controlled by a single valve control handle. The single valve control handle may be on the right side or the left side of the base. In this arrangement, the hot fluid mixes with the cold fluid in a single valve controlled by the single valve control handle. The fluid mixture is then directed to the inlet of the spout. In yet other embodiments, hot and cold fluid are mixed to achieve a predetermined temperature (e.g., by a thermostatic mixing valve), and the user controls only the on/off state of the fluid and/or the flow rate of the mixed fluid. The fluid flow may be controlled by a variety of different types of user interfaces (e.g., hand-activated handles, knee-activated buttons or paddles, foot-activated pedals, etc.). By way of example, a valve may be controlled by a button or a sensor that detects the presence or movement of an operator&#39;s hands (e.g., an infrared time of flight sensor, a capacitive sensor, etc.). Such a user interface may, when activated, initiate a flow at a predetermined temperature and flow rate for a predetermined period of time. 
     Flow of fluid through the emergency wash arm and the spout may be controlled based on the position of the emergency wash arm. Specifically, the fixture includes a first valve assembly that selectively prevents flow through the spout and a second valve assembly that selectively prevents flow through the emergency wash arm. When the emergency wash arm is in the stored position, the first valve permits flow through the spout, and the second valve prevents flow through the emergency wash arm. When the emergency wash arm is in the active position, the first valve prevents flow through the spout, and the second valve permits flow through the emergency wash arm. Accordingly, when the emergency wash arm is moved to the active position, flow through the spout is automatically shut off, and flow through the emergency wash arm is automatically activated. 
     Referring now to  FIGS.  1 - 8   , a combination emergency wash and faucet system, combination emergency wash and faucet unit, or fixture is shown as fixture  50  according to an exemplary embodiment. The fixture  50  is coupled to a basin or sink  60 . The sink  60  may be a standalone unit (e.g., supported by legs) or may be supported by another support structure, such as a countertop. The sink  60  is configured to collect a fluid and has a drain  65  for draining the fluid. The sink  60  may be a kitchen sink, a laboratory sink, or another type of water receptacle. Thus, the fixture  50  may be used in a variety of settings from residential (e.g., kitchens) to commercial and lab settings. 
     The fixture  50  includes a main body, fixed portion, or base assembly, which is shown as base  100  coupled to the sink  60 . In some embodiments, the base  100  is directly coupled to the sink  60 . In other embodiments, the base  100  is indirectly coupled to the sink  60  (e.g., through a countertop). The fixture  50  further includes emergency wash assembly, shown as emergency wash arm  200 , pivotally coupled to the base  100 . The emergency wash arm  200  is configured to supply a first fluid (e.g., tepid or lukewarm water) in an upward direction (e.g., toward the face and/or eyes of a user). In some embodiments, the temperature and/or flow rate of the first fluid is predetermined and/or preset (e.g., as required by one or more standards). By way of example, the temperature of the first fluid may be set by a thermostatic mixing valve. The fixture  50  further includes a faucet or spout section or assembly, shown as spout assembly  300 , pivotally coupled to the base  100 . The spout assembly  300  is configured to dispense a second fluid (e.g., water). Thus, the base  100  is an intermediary between spout assembly  300  and the wash arm  200 . 
     Referring particularly to  FIGS.  1  and  7   , the emergency wash arm  200  extends from a proximal end  231 , which is coupled to the base  100 , to a distal end  233 . The emergency wash arm  200  includes an emergency wash unit, shown as eyewash  230 , positioned at the distal end  233  of the emergency wash arm  200 . A member, shown as connecting pipe  235 , extends between and couples the eyewash  230  to the base  100 . The eyewash  230  is configured to dispense the first fluid (e.g., tepid water) into the eyes and/or face of a user. The eyewash  230  defines a pair of outlets, shown as apertures  240 , that each direct a spray of water upwards and inwards to where the eyes of a person using the eyewash  230  would be located. In some embodiments, the eyewash  230  includes a pair of flaps or covers  245  that cover the apertures  240  when the eyewash  230  is not in use (e.g., as shown in  FIG.  1   ). The covers  245  may be pivotally coupled to a body of the eyewash  230  such that the covers  245  rotate away from the spray when the eyewash  230  is in use (e.g., to the positions shown in  FIG.  7   ). The covers  245  prevent dust or other debris from settling in the apertures  240  over time. Although  FIGS.  1    and  7  illustrate the covers  245  as being closed and opened, respectively, with the emergency wash arm  200  in the active position, it should be understood that the covers  245  may normally remain closed unless water flows out of the apertures  240 . 
     In the embodiment shown in  FIGS.  1 - 6   , two user interfaces or valve controllers, shown as cold water handle  401  and hot water handle  402 , control the flow rate and temperature of the second fluid expelled from the spout assembly  300 . Specifically, the cold water handle  401  includes a valve that controls a flow rate of cold water to the spout assembly  300 , and the hot water handle  402  includes a valve that controls a flow rate of hot water to the spout assembly  300 . Hot water and cold water may mix in the spout assembly  300 , such that mixed water exits the spout assembly  300 . As shown, the handles  401 ,  402  are positioned on opposite sides of the base  100 . Specifically, the handles  401 ,  402  are positioned such that, when a user is facing the fixture  50 , the cold water handle  401  is positioned to the right of the base  100  and the hot water handle  402  is positioned to the left of the base  100 . 
     In an alterative embodiment, the flow rate and/or temperature of the fluid expelled from the spout assembly  300  may be electronically controlled (e.g., turned on based on a sensor detecting a presence of a user). In such embodiments, the cold water handle  401  and the hot water handle  402  may be omitted. By way of example, the fixture  50  may include a motion sensor (e.g., an infrared sensor, an ultrasonic sensor, etc.) that detects motion (e.g., movement of a user&#39;s hands) and/or the presence of an object (e.g., a user&#39;s hands) nearby the fixture  50  (e.g., over the sink  60 ) and initiates a flow of fluid to the spout assembly  300  in response to such a motion or presence. By way of another example, the fixture  50  may include a touch sensor (e.g., a button, a capacitive sensor, etc.) that detects when a user contacts a predetermined location (e.g., a surface of the spout assembly  300 ) and initiates a flow of fluid to the spout assembly  300  in response to such a contact. In such examples, a controller coupled to the sensor(s) may control operation of an electronic valve based on an input from the sensor. The controller may initiate the flow for a predetermined period of time, at a predetermined flow rate, and/or at a predetermined temperature. 
     The emergency wash arm  200  is rotatable relative to the base  100  about a first vertical axis, shown as vertical axis  90 . The emergency wash arm  200  may rotate within a horizontal plane. The spout assembly  300  is rotatable relative to the base  100  about a second vertical axis, shown as vertical axis  92 . The vertical axis  90  is positioned closer to the user (e.g., closer to the center of the sink  60 ) than the vertical axis  92 . In other words, a distance between a user and the vertical axis  90  is less than a distance between the user and the vertical axis  92 . In other embodiments, the emergency wash arm  200  has a different range of movement relative to the base  100 . By way of example, the emergency wash arm  200  may rotate about a horizontal axis or about an axis that is between horizontal and vertical (e.g., at 45 degrees relative to a vertical axis). 
     The emergency wash arm  200  is selectively repositionable (e.g., in response to a manual input by a user, such as grabbing and pulling the emergency wash arm  200 ) between an active or use position and an inactive, stowed away, or stored position. In the active position of the emergency wash arm  200  (e.g., as shown in  FIG.  1   ), the emergency wash arm  200  extends forward from the base  100  over the sink  60 . In the stored position (e.g., as shown in  FIG.  8   ), the emergency wash arm  200  is rotated away from the active position, toward the back of the sink  60 . The emergency wash arm  200  extends laterally, minimizing interference with normal use of the sink (e.g., use of the handles  401 ,  402 , insertion of items into the sink  60 , operation of the spout assembly  300 , etc.). Accordingly, movement of the emergency wash arm  200  is limited to predefined range (e.g., a predetermined amount of movement). Specifically, the emergency wash arm  200  is limited to rotate through a predefined rotational range. As shown, the active position of the emergency wash arm  200  is offset approximately 90° from the stored position of the emergency wash arm  200  (i.e., the rotational range is approximately 90°). In other embodiments, the active position of the emergency wash arm  200  is offset a different angle from the stored position of the emergency wash arm  200  (e.g., 120°, 60°, 45°, etc.). This predefined rotational range may change positions when fixture  50  changes between a right-handed configuration and a left-handed configuration. In some embodiments and as shown, the predefined rotational range in the right-handed configuration and the predefined rotational range in the left-handed configuration are symmetrical about a central plane of the fixture  50 . 
     The spout assembly  300  is selectively repositionable (e.g., in response to a manual input by a user, such as grabbing and pulling the spout assembly  300 ) throughout a range of active or use positions (e.g., as shown in  FIG.  7   ). The range may be approximately centered about a central active position (e.g., aligned with the active position of the emergency wash arm  200 , oriented straight toward the user, aligned with a central plane of the fixture  50 , etc.). Accordingly, movement of the spout assembly  300  is limited to predefined range (e.g., a predetermined amount of movement). Specifically, the spout assembly  300  is limited to rotate through a predefined rotational range. In some embodiments and as shown, the range has a width of approximately 90°. In other embodiments, the range has a different width (e.g., 200°, 180°, 120°, etc.). As shown in  FIG.  1   , the spout assembly  300  is repositionable into an inactive, stowed away, or stored position. The stored position may be located to the side of (e.g., at an end of) the range of active positions. In the stored position, the spout assembly  300  is rotated away from the active position of the emergency wash arm  200 , toward the back of the sink  60 . The spout assembly  300  extends at least partially laterally, minimizing interference with use of the emergency wash arm  200  (e.g., minimizing interference between a user&#39;s head and the spout assembly  300  when the user&#39;s head is placed above the emergency wash arm  200 ). As shown, the active position of the emergency wash arm  200  is offset approximately 45° from the stored position of the spout assembly  300 . 
     In some embodiments, the base  100  is configured to control relative movement of the emergency wash arm  200  and the spout assembly  300 . By way of example, when the emergency wash arm  200  is in the stored position, the spout assembly  300  may be free to rotate throughout the range of active positions. When the emergency wash arm  200  is in the active position, the spout assembly  300  may be limited to the stored position. In this configuration, the emergency wash arm  200  and the spout assembly  300  may be separated by a predefined or predetermined angle, separation amount, or separation distance (e.g., an angle measured about a vertical axis). In some embodiments, this angle is an acute angle (e.g., between 0° and 90°). In some such embodiments, this angle is between 30° and 60°. In one particular embodiment and as shown, this angle is approximately 45°. In other embodiments, the angle is larger than 90°. Thus, when the emergency wash arm  200  is in the active position, the spout assembly  300  is in the stored position, which is shown as being offset 45° from the emergency wash arm  200 . In other embodiments, the base  100  controls movement of the spout assembly  300  such that the spout assembly  300  is offset from the emergency wash arm  200  by at least this angle when the emergency wash arm  200  is in the active position (i.e., the spout  300  is free to rotate farther away from emergency wash arm  200 ). When the emergency wash arm  200  is moved from the stored position to the active position, components of the base  100  may be configured to control movement of the spout  300  such that the spout  300  moves from any initial position throughout the range of active positions toward the stored position. Accordingly, the spout  300  may be configured to end up in the same stored position regardless of if the spout  300  were initially in the active position closest to the stored position of the emergency wash arm  200  or in an active position near the stored position of the spout  300 . 
     In some embodiments, the base  100  includes one or more valve assemblies configured to control the flow rate of fluid through the emergency wash arm  200  and/or the spout assembly  300 . In some embodiments, the flow rate of the first fluid through the emergency wash arm  200  and the flow rate of the second fluid through the spout assembly  300  are controlled based on the position of the emergency wash arm  200 . By way of example, when the emergency wash arm  200  is in the stored position, the base  100  may prevent flow through the emergency wash arm  200  and permit flow through the spout assembly  300  (e.g., as controlled by the handles  401 ,  402 ). When the emergency wash arm  200  is moved to the active position, the base  100  can restrict (e.g., cut off) flow through the spout assembly  300  and permit (e.g., activate) flow through the emergency wash arm  200 ). 
     As shown in  FIGS.  1 - 8   , the fixture  50  is configured in a right-handed configuration. In a right-handed configuration, the user may rotate the emergency wash arm  200  to the active position using their right hand while the user is facing the fixture  50  (e.g., by pulling the emergency wash arm  200 ). In such embodiments, the emergency wash arm  200  may always be positioned to the right (e.g., counter-clockwise as viewed from above) of the spout assembly  300 . Referring to  FIGS.  9 A and  9 B , an alternative embodiment of the fixture  50  is shown. In this embodiment, the fixture  50  has a left-handed configuration. Specifically, the spout assembly  300  is shown positioned (e.g., angled) to the right of the emergency wash arm  200 .  FIG.  9 A  shows the emergency wash arm  200  in the active position, and  FIG.  9 B  shows the emergency wash arm  200  in the stored position. Accordingly, the emergency wash arm  200  may have a first stored position in the right-handed configuration (e.g., as shown in  FIG.  8   ) and a second stored position in the left-handed configuration (e.g., as shown in  FIG.  9 B . The first stored position may be offset approximately 180° from the second stored position. 
     Referring to  FIGS.  10 A and  10 B , alternative embodiments of the fixture  50  are shown. In these embodiments, the handles  401 ,  402  are replaced with a user interface or valve controller, shown as mixed water handle  450 . The mixed water handle  450  is configured to control a flow rate and temperature of a fluid (e.g., water) expelled from the spout assembly  300 . The mixed water handle  450  is configured to operate a valve that controls the flow of mixed hot and cold water from the spout assembly  300 . As shown in  FIG.  10 A , the mixed water handle  450  is positioned to the right of the base  100 , and the fixture  50  has a left-handed configuration. As shown in  FIG.  10 B , the mixed water handle  450  is positioned to the left of the base  100 , and the fixture  50  has a right-handed configuration. In other embodiments, the mixed water handle  450  is positioned elsewhere relative to the base  100 . The handles  401 ,  402  or the mixed water handle  450  may be utilized with any embodiment of the emergency wash and fixture  50  described herein. In yet other embodiments, the mixed water handle  450  is omitted, and the temperature and/or flow rate of the second fluid through the spout assembly  300  is otherwise controlled. By way of example, the temperature of the second fluid may be controlled by a thermostatic mixing valve. By way of example, the flow through the spout assembly  300  may be controlled by an infrared sensor (e.g., activating the flow at a predetermined flow rate for a predetermined time period in response to an object moving within a threshold distance of the sensor). 
     Referring to  FIGS.  11  and  12   , an alternative embodiment of the fixture  50  is shown. In this embodiment, the eyewash  230  is replaced with an emergency wash unit, shown as facewash  250 . The facewash defines a series of outlets or openings, shown as nozzles  260 , which are configured to direct fluid towards a person&#39;s face. The nozzles  260  may be configured to cover a larger area of the face than the apertures  240  of the eyewash  230 . The facewash  250  includes covers  265  that cover the nozzles  260 , functioning similarly to the covers  245 . Although  FIGS.  11  and  12    illustrate the covers  265  as being closed and opened, respectively, with the emergency wash arm  200  in the active position, it should be understood that the covers  265  may normally remain closed unless water flows out of the nozzles  260 . 
     Referring now to  FIGS.  13  and  14   , the base  100  includes: a bottom portion, frame, or body, shown as base frame  110 ; a middle portion, frame, or body, shown as main housing  130 ; and a top portion, body, or cover, shown as base cover  140 . The base frame  110  is configured to be coupled to the sink  60 . The main housing  130  is coupled to a top surface of the base frame  110 . The main housing  130  defines an emergency wash arm recess, shown as arm recess  134 , that receives an end of the emergency wash arm  200 . In some embodiments, the arm recess  134  is shaped to permit at least 180° of rotation of the emergency wash arm  200  without interference with the main housing  130 . The base frame  110 , the main housing  130 , and the base cover  140  are coupled to one another using a series of fasteners, shown in  FIGS.  16 ,  18   , and  19  as bolts  118 . The base cover  140  is coupled to a top surface of the main housing  130 . The base  100  is generally elliptical in shape. In other embodiments, the base  100  may have a different shape. 
     Referring now to  FIG.  15   , the base  100  includes a protrusion or collar, shown as neck  112 , coupled to and extending below the base frame  110 . One or more couplers or fasteners, shown as studs  113 ,  114 , are coupled to and extend below the neck  112 . The neck  112  and the studs  113 ,  114  may cooperate to couple the base  100  to the sink  60  and/or to a countertop supporting the sink  60 . By way of example, the neck  112  may extend through an aperture defined by the sink  60 , locating the base  100  within a horizontal plane of the countertop. The base frame  110  may be wider than the neck  112  such that the base frame  110  engages a top surface of the sink  60  and/or the countertop. The studs  113 ,  114  may each engage with one or more fasteners (e.g., nuts, washers, etc.) that extend along a bottom side of the sink  60  and/or the countertop, coupling the base  100  to the sink  60 . As shown, the studs  113 ,  114  are externally threaded, however, the studs  113 ,  114  may be replaced with any type of fastener (e.g., bolts, rivets, screws, etc.). Alternatively, the base  100  may be coupled to the sink  60  by an adhesive, a snap fit, a quick release, or other type of coupling. In such embodiments, the neck  112  and the base frame  110  may facilitate the coupling (e.g., the exterior of the neck  112  may be threaded to engage with a nut). 
     Referring to  FIGS.  16 - 18   , the spout assembly  300  includes a tubular member, shown as spout neck  303 , coupled to (e.g., crimped together with) a faucet main body, shown as faucet support  310 . Although the spout neck  303  is shown having a generally arcuate shape, the spout neck  303  may have any shape (e.g., flat, angled, curved, etc.). Additionally or alternatively, the cross-sectional shape, the length, and the width of the spout neck  303  may vary between different embodiments. A faucet cover  305  is in threaded engagement with a threaded portion  312  of the faucet support  310 . The faucet cover  305  and the base cover  140  of the base  100  cover (e.g., visually obscure) the connection between the spout neck  303  and the faucet support  310 . The faucet support  310  defines a central passage or aperture, shown as shaft aperture  313 . The shaft aperture  313  extends through the center of the faucet support  310  and is fluidly coupled to the spout neck  303 . The main housing  130  of the base  100  includes a vertical protrusion, shown as shaft  137 , that is received within the shaft aperture  313 . The shaft  137  and the shaft aperture  313  are shaped and sized (shown as circular) such that the faucet support  310  pivotally couples the spout assembly  300  to the base  100 . A protrusion (e.g., a peg, a flange, etc.), shown as stop protrusion  311 , is fixedly coupled to (e.g., formed as a unitary member with) faucet support  310 . The stop protrusion  311  extends downward from the main portion of the faucet support  310 . The stop protrusion  311  is radially offset from (e.g., not aligned with) the vertical axis  92 . 
     Referring to  FIG.  16   , the base  100  is configured to selectively fluidly couple a source of tepid water to the emergency wash arm  200  and source of mixed water to the spout assembly  300 . The base  100  defines (a) a first fluid path  905  (e.g., a fixture fluid path) between a first aperture, shown as inlet  116 , and the spout assembly  300 , and (b) a second fluid path  907  (e.g., an emergency wash fluid path) between a second aperture, shown as inlet  115 , and the emergency wash arm  200 . The inlet  116  is configured to be fluidly coupled to the source of mixed fluid (e.g., the output of the cold water handle  401  and the hot water handle  402 ). The inlet  115  is configured to be fluidly coupled to the source of tepid water (e.g., an output of a thermostatic mixing valve). The inlet  115  and the inlet  116  are positioned at the bottom of the base  100 . This may facilitate connection to the water sources below the sink  60  such that the connection is visually obscured to an observer positioned above the sink  60 . As shown in  FIGS.  16 - 19   , the fixture  50  includes a series of seals, shown as o-ring seals  160 , that seal various fluid connections between components and/or prevent egress of dust. 
     Referring to  FIGS.  16 - 20   , the base frame  110  of the base  100  defines a first aperture or passage, shown as fluid channel  271 , which defines a portion of the fluid path  907 . The fluid channel  271  fluidly couples the inlet  115  to a valve assembly, shown as disc valve  209 . The disc valve  209  selectively fluidly couples the fluid channel  271  to a rotating body or connector, shown as hub  170 , based on the position of the emergency wash arm  200 . The hub  170  defines an outlet  172  that is fluidly coupled to the emergency wash arm  200 . Accordingly, the inlet  115  is selectively fluidly coupled to the emergency wash arm  200  via the fluid path  907 , which is defined by the inlet  115 , the fluid channel  271 , the disc valve  209 , and the hub  170 . 
     Referring to  FIG.  16   , the base frame  110  and the main housing  130  define an aperture or passage, shown as fluid channel  355 , which defines a portion of the fluid path  905 . The fluid channel  355  fluidly couples the inlet  116  to a valve assembly, shown as spool valve  360 . The main housing  130  defines an aperture or passage, shown as fluid channel  350 , extending upward from the spool valve  360  to the faucet support  310 . The fluid channel  350  is substantially centered within the shaft  137 . The spool valve  360  selectively fluidly couples the fluid channel  355  to the fluid channel  350  based on the position of the emergency wash arm  200 . Accordingly, the inlet  116  is selectively fluidly coupled to the spout assembly  300  through (i.e., the fluid path  905  is defined by) the inlet  116 , the fluid channel  355 , the spool valve  360 , and the fluid channel  350 . 
     Referring to  FIGS.  16 ,  19 , and  20   , the disc valve  209  includes a first valve element, shown as bottom disc  210 , and a second valve element, shown as top disc  211 . The bottom disc  210  and the top disc  211  are substantially cylindrical and approximately the same size. In some embodiments, the bottom disc  210  and the top disc  211  are made from a ceramic material. 
     The bottom disc  210  is fixedly coupled to the base frame  110  such that the bottom disc  210  is stationary relative to base frame  110 . The bottom disc  210  defines two fluid communication apertures, shown as fluid flow apertures  221 ,  223 , which extend through the entire height of the bottom disc  210 . The bottom disc  210  further defines a pair of locking apertures  222 ,  224 , which extend at least partway through the height of the bottom disc  210 . The fluid flow apertures  221 ,  223  are each fluidly coupled to the inlet  115  through the fluid channel  271 . The locking apertures  222 ,  224  may receive corresponding protrusions from the base frame  110  to limit (e.g., prevent) rotation of the bottom disc  210  relative to the base frame  110 . In other embodiments, the locking apertures  222 ,  224  are omitted, and the bottom disc  210  is otherwise coupled to the base frame  110  (e.g., using an adhesive) 
     The top disc  211  is positioned above the bottom disc  210  such that a flat top surface of the bottom disc  210  engages a flat bottom surface of the top disc  211 . This creates a seal between the top disc  211  and the bottom disc  210 . The base frame  110  contains the top disc  211  and the bottom disc  210  such that both are substantially aligned with (e.g., centered about) the vertical axis  90 . The top disc  211  is rotatably coupled to the bottom disc  210  such that the top disc  211  is rotatable relative to the bottom disc  210  about the vertical axis  90 . The top disc  211  defines a pair of fluid flow apertures  225 ,  226  that extend through the entire height of the top disc  211 . The fluid flow apertures  225 ,  226  may have approximately the same size, shape, and spacing as the fluid flow apertures  221 ,  223 . The top disc  211  defines a pair of parallel flat surfaces, shown as flats  213 ,  214 . The flats  213 ,  214  are positioned on an exterior surface of the top disc  211  and each extend substantially vertically. The flats  213 ,  214  engage the hub  170 , rotationally coupling the emergency wash arm  200  to the top disc  211  such that rotation of the emergency wash arm  200  causes an identical (e.g., in speed, magnitude, and direction) rotation of the top disc  211 . 
     When the emergency wash arm  200  is outside of the active position (e.g., in the stored position, in a position between the active position and the stored position, etc.), the fluid flow apertures  225 ,  226  are not in alignment with the fluid flow apertures  221 ,  223 . Instead, the fluid flow apertures  225 ,  226  seal against the flat top surface of the bottom disc  210 , preventing fluid from flowing through the disc valve  209 . When the eyewash arm  200  is rotated into the active position, the fluid flow apertures  225 ,  226  are aligned with the fluid flow apertures  221 ,  223 , respectively, thereby fluidly coupling the fluid channel  271  with the hub  170 . This permits tepid water to flow through the disc valve  209  and out through the emergency wash arm  200 . 
     The hub  170  is generally cylindrical in shape. In other embodiments, the hub  170  has a different shape and/or size (rectangular, oval, etc.). The hub  170  is received within and pivotally coupled to the main housing  130  of the base  100 . Specifically, the hub  170  is centered about the vertical axis  90  and configured to rotate about the vertical axis  90 . To facilitate rotation of the hub  170 , the fixture  50  includes a friction-reducing member or assembly, shown as bushing  161 , that extends between a top surface of the hub  170  and the main housing  130 . The bushing  161  is made from a material (e.g., bronze, polymer, etc.) configured to reduce friction between the hub  170  and the main housing  130 . In other embodiments, the bushing  161  is replaced with another type of friction-reducing assembly, such as a ball bearing. The hub  170  includes a pair of protrusions, shown as hub flanges  173 . The hub flanges  173  extend downward and receive the top disc  211  therebetween. The hub flanges  173  each define a flat surface that engages one of the flats  213 ,  214  to limit (e.g., prevent) rotation of the top disc  211  relative to the hub  170 . Accordingly, the hub flanges  173  rotationally couple the top disc  211  to the hub  170 . The hub  170  further includes a protrusion or support, shown as hexagonal stud  128 , extending upward from the main portion of the hub  170 . The hexagonal stud  128  has a hexagonal cross section and is substantially centered about the vertical axis  90 . 
     The hub  170  defines an aperture, shown as inlet  171 , positioned at the bottom of the hub  170 , which is fluidly coupled to the outlet  172 . The inlet  171  is substantially centered about the vertical axis  90 . The inlet  171  is fluidly coupled to the fluid flow apertures  225 ,  226  of the top disc  211 . The outlet  172  receives an end of the connecting pipe  235  of the emergency wash arm  200  and fluidly couples the inlet  171  to the emergency wash arm  200 . The emergency wash arm  200  is fixedly coupled to the hub  170 . 
     Referring to  FIGS.  20  and  21   , the hub  170  defines a recess, groove, slot, or notch, shown as hub slot  176 , positioned opposite the outlet  172 . The hub slot  176  extends along a circumference of the hub  170  and generally extends within a horizontal plane. In some embodiments, a curvature of the hub slot  176  viewed perpendicular to the circumference of the hub  170  is substantially circular (e.g., such that the cross sectional shape of the hub slot  176  is substantially semicircular). An outer portion of the hub slot  176  defines a control surface, shown as cam surface  177 . A depth of the hub slot  176  extends between an outer surface of the hub  170  adjacent the hub slot  176  and the cam surface  177 . Specifically, a distance between the outer surface of the hub  170  and the vertical axis  90  (i.e., a radius of the outer surface) is a radius R MAX . The radius of the cam surface  177  gradually decreases from the radius R MAX  to a radius R MIN . The radius R MIN  is located at the center of the hub slot  176 , directly opposite the outlet  172 . 
     Referring to  FIG.  16   , the spool valve  360  is received within an aperture or passage, shown as spool passage  351 , and a recess, shown as spool cavity  359 , both of which are defined by the main housing  130 . The spool cavity  359  is positioned near the back of the main housing  130 , opposite the hub  170 . The spool cavity  359  is intersected by the fluid channel  355 , and the spool passage  366  is intersected by the fluid channel  350 . The spool passage  351  extends horizontally between the hub  170  and the spool cavity  359 . 
     Referring to  FIGS.  16  and  22   , the spool valve  360  includes a valve element (rod, shaft, etc.), shown as spool  361 , an annular collar, flange or valve element, shown as sealing collar  362 , a collar, shown as cap  363 , a biasing element or biasing member, shown as spring  365 , and a fitting or cap  368  configured to retain the spool valve  360  within the base  100 . The spool  361  is generally cylindrical in shape. In some embodiments, an end of the spool  361  closest to the hub  170  has a slight taper (e.g., to match or substantially match the curvature of the cam surface  177 ). In the spool valve  360  is generally aligned with a horizontal plane. In some embodiments, the spool valve  360  is generally aligned with a horizontal plane through which the emergency wash arm  200  travels. The spool  361  extends horizontally within the spool passage  351 , and an end of the spool  361  engages the cam surface  177  of the hub  170 . The spool  361  is coupled, particularly slidably, to the main housing  130  and configured to translate horizontally along the spool passage  351 . The spool  361  sealingly engages the wall of the spool passage  351 , preventing fluid from the spool passage  351  from reaching the hub  170  (i.e., fluidly decoupling the first fluid path  905  from the second fluid path  907 ). The sealing collar  362  is coupled to an end of the spool  361  opposite the hub  170 . By way of example, the end of the spool  361  may be received in a bore of the sealing collar  362 . The cap  363  receives the sealing collar  362 . The cap  368  is fixedly coupled to the main housing  130 , sealing the spool cavity  359  from the surroundings. The spring  365  extends between and engages the cap  363  and the cap  368 , applying a biasing force that biases the cap  363 , the sealing collar  362 , and the spool  361  toward the hub  170 . In other embodiments, one or more of the spool  361 , the sealing collar  362 , and the cap  363  are formed as a single, continuous piece. In other embodiments, the first fluid path  905  is otherwise fluidly decoupled from the second fluid path  907  based on the position of the emergency wash arm  200 . By way of example, the spool valve  360  may be replaced with a different type of valve that is operatively coupled to the emergency wash arm, such as a disc valve, a ball valve, or a butterfly valve. 
     A wall of the spool cavity  359  surrounding the spool passage  351  defines a sealing surface, shown as annular surface  353 . The annular surface  353  is frustoconical and decreases in diameter as it extends toward the hub  170 . The sealing collar  362  defines a sealing surface, shown as annular surface  364 . The annular surface  364  and the annular surface  353  are correspondingly shaped such that the sealing collar  362  seals the spool passage  351  from the spool cavity  359  when the annular surface  364  engages the annular surface  353 . Accordingly, the biasing force of the spring  365  biases the sealing collar  362  into engagement with the annular surface  353 . 
     Referring to  FIGS.  16  and  21   , engagement between the end of the spool  361  and the cam surface  177  controls operation of the spool valve  360 . Because of the biasing force of the spring  365 , the spool  361  is in constant contact with the cam surface  177 , at least until the spool valve  360  is sealed. Accordingly, the position of the spool  361  along the length of the spool passage  351  correlates to the radius of the cam surface  177  at the point of engagement with the spool  361 . When the radius of the cam surface  177  is larger, the spool  361  is forced away from the vertical axis  90 . The radius of the cam surface  177  changes along the length of the cam surface  177 . Accordingly, the position of the spool  361  changes as the emergency wash arm  200  is rotated. In some embodiments, the end or tip of the spool  361  that engages the cam surface  177  may be configured to reduce friction between the spool  361  and the cam surface  177 , thereby facilitating movement of the spool  361  along the cam surface  177  during operation. By way of example, one or both of the tip of the spool  361  and the cam surface  177  may include a low-friction material (e.g., bronze, nylon, Teflon, etc.) or a friction reducing member (e.g., a ball bearing, etc.) that reduces friction between the spool  361  and the cam surface  177 . 
     When the emergency wash arm  200  is in the stored position, the spool  361  is in contact with the largest part of the cam surface  177  (e.g., having a radius of R MAX ). The cam surface  177  forces the spool  361  away from the vertical axis  90  thereby forcing the sealing collar  362  out of engagement with the annular surface  353 . The spool valve  360  is thus in an open or unsealed configuration (i.e., the spool  361  and the sealing collar  362  are in an unsealed or open position) where the spool valve  360  permits fluid to flow freely along the first fluid path  905 . As the emergency wash arm  200  rotates toward the active position, the radius of the cam surface  177  at the point of engagement with the spool  361  gradually decreases, permitting the spring  365  to move the spool  361  toward the vertical axis  90 . As the emergency wash arm  200  approaches the active position, the radius of the cam surface  177  decreases to where the sealing collar  362  is permitted to engage the annular surface  353 . The spool valve  360  is thus in a sealed or closed configuration (i.e., the spool  361  and the sealing collar  362  are in a closed or sealed position) where the spool valve  360  limits (e.g., completely prevents) fluid to flow from the spool cavity  359  to the spool passage  351  or the fluid channel  350 . 
     Accordingly, when the emergency wash arm  200  is in the stored position, the spool valve  360  permits fluid to flow out of the spout assembly  300  (e.g., as controlled by the handles  401 ,  402 ), and the disc valve  208  limits (e.g., completely prevents) fluid flow out of the emergency wash arm  200 . In response to the emergency wash arm  200  moving to the active position, the spool valve  360  limits (e.g., completely prevents) fluid flow out of the spout assembly  300  and permits fluid flow out of the emergency wash arm  200 . In some embodiments, the cam surface  177  is symmetrical about a plane extending along the vertical axis  90  and along the center of the emergency wash arm  200  such that the spool valve  360  exhibits similar or identical flow control characteristics when the fixture  50  is in a right-handed configuration and when the fixture  50  is in a left-handed configuration. 
     Referring to  FIGS.  17  and  23   , the fixture  50  includes a coupling mechanism (e.g., power transmission, rotation control assembly, etc.) that is shown as a gear train  150 . The gear train  150  is configured to control rotation of the spout assembly  300  and the emergency wash arm  200 . Specifically, the gear train  150  is configured to limit rotation of the emergency wash arm  200  to a first rotational range having a constant width, and the gear train  150  is configured to limit rotation of the emergency wash arm  200  to a second rotational range having a width that varies based on a rotational position of the emergency wash arm  200 . By way of example, the width of the first rotational range may be approximately 90°. By way of example, the width of the second rotational range may range from approximately 90° when the emergency wash arm  200  is in the stored position to approximately 0° when the emergency wash arm  200  is in the active position. 
     The gear train  150  includes rotators, transmission members, or rotation control members, shown as wash gear  152  (e.g., driver, master member), idler gear  154  (e.g., intermediate member), and spout gear  156  (e.g., driven member, slave member). The wash gear  152  is coupled to the hub  170 . Specifically, the wash gear  152  defines an aperture that receives the hexagonal stud  128 , and is held in place by a fastener  135  that is threaded into the hexagonal stud  128 . The wash gear  152  is centered about and rotates about the vertical axis  90 . The aperture of the wash gear  152  has a shape that corresponds to the shape of the hexagonal stud  128 , limiting (e.g., preventing) rotation of the wash gear  152  relative to the hub  170 . The idler gear  154  defines an aperture that receives a support, shown as pin  139 , which is coupled to the main housing  130 . The idler gear  154  rotates freely on the pin  139 , such that the idler gear  154  is rotatably coupled to the main housing  130 . The spout gear  156  defines an aperture that receives the shaft  137  of the base  100 , rotatably coupling the spout gear  156  to the main housing  130 . The spout gear  156  is centered about and rotates about the vertical axis  92 . 
     The wash gear  152  has gear teeth along a portion of its circumference. The idler gear  154  has gear teeth around its entire circumference. The spout gear  156  has gear teeth along a portion of its circumference. The gear teeth of the idler gear  154  mesh with the gear teeth of both the wash gear  152  and the spout gear  156 . Accordingly, the idler gear  154  rotationally couples the wash gear  152  with the spout gear  156  such that a rotation of the wash gear  152  produces a corresponding rotation of the spout gear  156  in the same rotational direction and vice versa. In other embodiments, the gear train  150  includes more or fewer idler gears  154 . In yet other embodiments, the wash gear  152  and the spout gear  156  are otherwise rotationally coupled. By way of example, the wash gear  152  and the spout gear  156  may each engage a belt (e.g., a V belt, a timing belt, etc.) or a roller chain to be rotationally coupled to one another. 
     The base  100  includes a protrusion or stop, shown as stop pin  138 . The stop pin  138  is selectively repositionable between a first aperture, shown as right-hand pin hole  131 , at a first pin location or first pin position and a second aperture, shown as left-hand pin hole  132 , at a second pin location or second pin position. The right-hand pin hole  131  and the left-hand pin hole  132  are defined by the main housing  130 . Accordingly, the stop pin  138  is selectively coupled to the main housing  130 . 
     The wash gear  152  includes a pair of radial protrusions, shown as stops  162 ,  164 , that extend radially outward from the circumference of the wash gear  152 . Each stop  162 ,  164  defines a stop surface facing the other stop surface. The stops  162 ,  164  are positioned such that the stop pin  138  contacts or engages with (a) the stop surface of the stop  164  to limit rotation of the wash gear  152  (e.g., and thus the emergency wash arm  200 ) in a first direction (i.e., counter clockwise as shown in  FIG.  23   ) and (b) the stop surface of the stop  162  to limit rotation of the wash gear  152  in a second direction opposite the first direction (i.e., clockwise as shown in  FIG.  23   ). Accordingly, the wash gear  152  has a first rotation range associated with the first pin location and a second rotation range associated with the second pin location. In some embodiments, the widths of the first and second rotation ranges are between 30° and 180°. In some such embodiments (and as shown), the widths of the first and second rotation ranges are approximately 90°. In other embodiments, the widths of the first and second rotation ranges are greater than 180° (e.g., 200°). In some embodiments, the first and second rotation ranges are symmetrical about a central plane of the faucet  50 . 
       FIGS.  24  and  25    illustrate the rotation range of the wash gear  152  with the stop pin  138  in the right-hand pin hole  131  (i.e., in a right-handed configuration of the fixture  50 ). In  FIG.  24   , the emergency wash arm  200  is in the active position. The stop pin  138  engages the stop  162 , preventing further rotation of the wash gear  152  and the emergency wash arm  200  in the clockwise direction. In  FIG.  25   , the emergency wash arm  200  is in the stored position. The stop pin  138  engages the stop  164 , preventing further rotation of the wash gear  152  and the emergency wash arm  200  in the counter-clockwise direction. Accordingly, the stop pin  138  and the wash gear  152  limit rotation of the emergency wash arm  200  to a desired range. This facilitates a user pushing or pulling the emergency wash arm  200  to a desired position without overshooting. This may be especially useful when the emergency wash arm  200  is in an emergency situation and is visually and/or mentally impaired. Without this stopping action, the user may overshoot to a position where the emergency wash arm  200  is not fully activated, hindering proper operation of the eyewash  230 . 
       FIGS.  26  and  27    illustrate the rotation range of the wash gear  152  with the stop pin  138  in the left-hand pin hole  132  (i.e., in a left-handed configuration of the fixture  50 ). In  FIG.  26   , the emergency wash arm  200  is in the active position. The stop pin  138  engages the stop  164 , preventing further rotation of the wash gear  152  and the emergency wash arm  200  in the counter-clockwise direction. In  FIG.  27   , the emergency wash arm  200  is in the stored position. The stop pin  138  engages the stop  162 , preventing further rotation of the wash gear  152  and the emergency wash arm  200  in the clockwise direction. Accordingly, the fixture  50  can be reconfigured between a right-handed configuration and a left-handed configuration by moving the stop pin  138  between the right-hand pin hole  131  and the left-hand pin hole  132 . This requires no additional parts and minimal technical expertise. 
     Referring to  FIGS.  23 ,  28 , and  29   , the spout gear  156  defines a pair of radially-extending surfaces, shown as stop surface  190  and stop surface  192 , with a recess extending therebetween. The stop surface  190  and the stop surface  192  face one another. The main housing  130  defines a groove, recess, or aperture, shown as angled slot  158 , beneath the spout gear  156 . One end of the angled slot  158  defines a radially-extending surface, shown as stop surface  194 , and the opposite end of the angled slot  158  defines another radially-extending surface, shown as stop surface  196 . The stop surface  194  and the stop surface  196  face one another. In some embodiments, an angle between the stop surface  190  and the stop surface  192  is approximately equal to an angle between the stop surface  194  and the stop surface  196 . 
     The stop protrusion  311  of the faucet support  310  extends downward (a) between the stop surface  190  and the stop surface  192  and (b) between the stop surface  194  and the stop surface  196 . The stop protrusion  311  rotates with the spout assembly  300 . Accordingly, when movement of the stop protrusion  311  is limited, rotation of the spout assembly  300  is correspondingly limited. In  FIG.  28   , the spout gear  156  is in a position corresponding to the active position of the emergency wash arm  200 . In  FIG.  29   , the spout gear  156  is in a position corresponding to the stored position of the emergency wash arm  200 . The stop surface  190  and the stop surface  194  engage the stop protrusion  311  to limit rotation of the spout assembly  300  in a counter-clockwise direction. The stop surface  196  engages the stop protrusion  311  to limit rotation of the spout assembly  300  in a clockwise direction. 
     When the spout gear  156  is in the position corresponding to the stored position of the emergency wash arm  200 , the stop protrusion  311  is free to rotate through a first predefined range until contacting the stop surface  194  or the stop surface  196 . In some embodiments, the first range is greater than 180°. In some embodiments, the first range is between approximately 30° and 180 degrees. In some such embodiments, the first range is between approximately 60° and 120°. In particular and in some such embodiments (and as shown), the first range is approximately 90°. The stop surface  190  may not limit rotation of the spout assembly  300  in this configuration. Accordingly, the spout assembly  300  is free to rotate however the user chooses while the emergency wash arm  200  is in the stored position. In other embodiments, the spout assembly  300  may not be free to rotate relative to the emergency wash arm  20  when the emergency wash arm  200  is in the stored position. By way of example, the spout assembly  300  may be fixedly coupled to the emergency wash arm  200  such that the spout assembly  300  and the emergency wash arm  300  rotate in unison. 
     When the spout gear  156  is in the position corresponding to the active position of the emergency wash arm  200 , the stop surface  192  moves toward the stop surface  196 , limiting the rotation of the spout assembly  300 . In some embodiments, both the stop surface  190  and the stop surface  196  engage the stop protrusion  311 , holding the spout assembly  300  in the stored position and preventing further rotation of the spout assembly  300 . If the spout assembly  300  is not already in the stored position, the stop surface  190  engages the stop protrusion  311 , moving the spout assembly  300  toward the stored position. Accordingly, when the emergency wash arm  200  is moved to the active position, the spout assembly  300  is automatically moved toward the stored position, preventing the spout assembly  300  from interfering with a user&#39;s use of the eyewash  230 . This is especially useful in emergency situations, where the user may be visually and/or mentally impaired and not able to easily move the spout assembly  300  out of the way manually. 
       FIGS.  23 ,  28 , and  29    show a right-handed configuration (e.g., a first configuration) of the fixture  50  (e.g., where the spout assembly  300  is rotated to the left in the stored position).  FIGS.  30  and  31    show a left-handed configuration (e.g., a second configuration) of the fixture  50  (e.g., where the spout assembly  300  is rotated to the right in the stored position). To reconfigure the fixture  50  into the left-handed configuration, the spout gear  156  may be removed, flipped over, and placed back onto the shaft  137 . In such an arrangement the stop surface  190  may engage the stop protrusion  311  to limit rotation of the spout assembly  300  in a clockwise direction. Accordingly, the fixture  50  can be reconfigured between a right-handed configuration and a left-handed configuration by reorienting the spout gear  156 . This requires no additional parts and minimal technical expertise. 
     In an alternative embodiment, the angle between the stop surface  190  and the stop surface  192  is smaller than the angle between the stop surface  194  and the stop surface  196 . In such an embodiment, the stop surface  192  may limit rotation of the spout assembly  300  in the clockwise direction when the emergency wash arm  200  is in the stored position. In this configuration, the stored position of the spout assembly  300  may be outside of the range of active positions that the spout assembly  300  is able to access when the emergency wash arm  200  is in the stored position. 
     In alternative embodiments, any of the fluid channels (e.g., fluid channel  271 ) may be formed separately from the base  100 . By way of example, one or more of the fluid channels may be formed using conduits (e.g., hoses, pipes, tubes, etc.) made from hard materials (e.g., acrylic or other plastic, copper or other metal, or glass) or soft materials (e.g., silicone, rubber, etc.). 
     In yet other alternative exemplary embodiments, flows of fluid through the emergency wash arm  200  and/or the spout  300  are otherwise controlled. For example, the hub  170  may have a different type of valve that replaces the disc valve  209 . Additionally, the hub  170  may be shaped or positioned such that hub  170  does not control the flow of fluid to the spout assembly  300 . Alternatively, the flow of fluid to the spout assembly  300  may be controlled by another valve external to the hub  170  (e.g., a manually operated valve). By way of example, fluid flow to the spout assembly  300  or the emergency wash arm  200  may be controlled by an electronically-actuated valve. 
     As utilized herein, the terms “approximately,” “about,” “substantially,” and similar terms are intended to have a broad meaning in harmony with the common and accepted usage by those of ordinary skill in the art to which the subject matter of this disclosure pertains. It should be understood by those of skill in the art who review this disclosure that these terms are intended to allow a description of certain features described and claimed without restricting the scope of these features to the precise numerical ranges provided. Accordingly, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or alterations of the subject matter described and claimed are considered to be within the scope of the disclosure as recited in the appended claims. 
     It should be noted that the term “exemplary” and variations thereof, as used herein to describe various embodiments, are intended to indicate that such embodiments are possible examples, representations, or illustrations of possible embodiments (and such terms are not intended to connote that such embodiments are necessarily extraordinary or superlative examples). 
     The term “coupled” and variations thereof, as used herein, means the joining of two members directly or indirectly to one another. Such joining may be stationary (e.g., permanent or fixed) or moveable (e.g., removable or releasable). Such joining may be achieved with the two members coupled directly to each other, with the two members coupled to each other using a separate intervening member and any additional intermediate members coupled with one another, or with the two members coupled to each other using an intervening member that is integrally formed as a single unitary body with one of the two members. If “coupled” or variations thereof are modified by an additional term (e.g., directly coupled), the generic definition of “coupled” provided above is modified by the plain language meaning of the additional term (e.g., “directly coupled” means the joining of two members without any separate intervening member), resulting in a narrower definition than the generic definition of “coupled” provided above. Such coupling may be mechanical, electrical, or fluidic. 
     References herein to the positions of elements (e.g., “top,” “bottom,” “above,” “below”) are merely used to describe the orientation of various elements in the FIGURES. It should be noted that the orientation of various elements may differ according to other exemplary embodiments, and that such variations are intended to be encompassed by the present disclosure. 
     Although the figures and description may illustrate a specific order of method steps, the order of such steps may differ from what is depicted and described, unless specified differently above. Also, two or more steps may be performed concurrently or with partial concurrence, unless specified differently above. Such variation may depend, for example, on the software and hardware systems chosen and on designer choice. All such variations are within the scope of the disclosure. Likewise, software implementations of the described methods could be accomplished with standard programming techniques with rule-based logic and other logic to accomplish the various connection steps, processing steps, comparison steps, and decision steps. 
     It is important to note that the construction and arrangement of the fixture as shown in the various exemplary embodiments is illustrative only. Additionally, any element disclosed in one embodiment may be incorporated or utilized with any other embodiment disclosed herein. For example, the facewash  250  of the exemplary embodiment shown in at least  FIG.  11    may be incorporated in the fixture of the exemplary embodiment shown in at least  FIG.  1   . Although only one example of an element from one embodiment that can be incorporated or utilized in another embodiment has been described above, it should be appreciated that other elements of the various embodiments may be incorporated or utilized with any of the other embodiments disclosed herein.