Patent Publication Number: US-10765269-B2

Title: Cover arrangement for fluid dispenser

Description:
RELATED APPLICATION 
     This application is a continuation of co-pending U.S. patent application Ser. No. 16/059,764 filed Aug. 9, 2018 which is continuation of U.S. patent application Ser. No. 15/292,972 filed Oct. 13, 2016 which issued to U.S. Pat. No. 10,098,511 on Oct. 16, 2018 and claims the benefit of 35 U.S.C. 120. 
    
    
     SCOPE OF THE INVENTION 
     This invention relates to a cover for a fluid dispenser and, more particularly, to an arrangement for removably coupling a cover to a fluid dispenser, to an arrangement for providing a lever assembly to be removably coupled to a cover for a fluid dispenser and to a coupling arrangement by which a cover for a fluid dispenser can be moved between open and closed positions. 
     BACKGROUND OF THE INVENTION 
     Manually operated fluid dispensers are known for dispensing hand cleaning fluid onto a person&#39;s hand. Such dispensers typically have a cover to enclose the operational mechanisms of the dispensers. Such dispensers typically have surfaces which need to be engaged by a user to dispense fluid such as surfaces of a lever movable to discharge the fluid. Such dispensers also typically have other surfaces which come to be engaged by a user during use. For example, there is often a surface on the dispenser which is engaged in order to move the cover from a closed operative position to an open position as to replace a fluid containing bottle. 
     The present inventors have appreciated that previously known dispensers suffer the disadvantage that the surfaces of the dispenser which may be contacted by a user cannot be removed for advantageous cleaning by placing the surfaces in an autoclave or a washing machine. Many known dispensers suffer the disadvantage that their covers cannot be removed or easily removed and that levers to be engaged to disperse the cleaning fluid cannot be removed for cleaning as in an autoclave or washing machine. This difficulty is particularly acute insofar as there may be electronic equipment carried by the dispenser which prevents the entirety of the dispenser from being placed into an autoclave or a washing machine. 
     Previously known dispensers suffer the further disadvantage that covers for the dispensers are difficult for a user to move between open and closed positions and to remove the cover from the dispenser. 
     Previously known dispensers which include a cover and a lever member operative to dispense fluid from the dispenser suffer the disadvantage that the cover and the lever member are separate items which need to be independently removed from the dispenser for cleaning. 
     SUMMARY OF THE INVENTION 
     To at least partially overcome some of these disadvantages of previously known dispensers, the present invention provides a fluid dispenser having a cover assembly including a cover and a lever in which lever is removably coupled to the cover and in which the cover assembly is removably coupled to the housing for coupling and uncoupling of the cover assembly to the housing while the lever is coupled to the cover. 
     To at least partially overcome other of these disadvantages of previously known dispensers, the present invention provides a fluid dispenser having a housing and a cover removably coupled to the housing with the cover having a right cover side wall and a left cover side wall secured together spaced laterally from each other and in which the cover side walls are resilient and deflectable laterally away from each other for disengagement of the cover from the housing. 
     To overcome other of these disadvantages of previously known dispensers, the present invention provides a fluid dispenser having a cover including a right cover side wall and a left cover side wall spaced laterally from each other and joined by a top wall and in which a rod member bridges between lower portions of the side walls. 
     In a first aspect, the present invention provides a fluid dispenser having: 
     a housing, 
     a cover assembly removably coupled to the housing for coupling and uncoupling of the cover assembly and the housing, 
     when the cover is coupled to the housing the cover and housing define an interior compartment therebetween, 
     the cover having a right cover side wall and a left cover side wall secured together spaced laterally from each other, the housing has a right housing side wall and a left housing side wall secured together spaced laterally from each other by a housing back wall, 
     when the cover is coupled to the housing the right cover side wall is laterally to the right of right housing side wall, the left cover side wall is laterally to the left of housing side wall, 
     when the cover is coupled to the housing, the right cover side wall engages the right housing side wall and the left cover side wall engages the left housing side wall, 
     to uncouple the cover from the housing, the right cover side wall is deflected laterally away from the right housing side wall and the left cover side wall is deflected laterally away from the left housing side wall. Preferably, the cover has a top wall bridging between the right side wall and the left side wall and the top wall extends between the right cover side wall and the left cover side wall above the right housing side wall and the left housing side wall. Preferably, the cover is open at a rear of the cover, in coupling of the cover assembly and the housing while the right cover side wall is deflected laterally away from the right housing side wall and the left cover side wall is deflected laterally away from the left housing side wall the housing passes rearwardly through the open rear of the cover, and in uncoupling of the cover assembly and the housing while the right cover side wall is deflected laterally away from the right housing side wall and the left cover side wall is deflected laterally away from the left housing side wall the housing passes forwardly through the open rear of the cover. 
     In a second aspect, the present invention provides a fluid dispenser having: 
     a housing, 
     a fluid pump, 
     a cover assembly including a cover and a lever member, 
     the lever member removably coupled to the cover, 
     a cover assembly removably coupled to the housing for coupling and uncoupling of the cover assembly and the housing while the lever member is coupled to the cover, 
     when the cover assembly is coupled to the housing, the lever member is accessible for manual engagement by a user for movement of the lever to activate the fluid pump and dispense fluid from the fluid dispenser, 
     the lever member including an axle about an axle axis, 
     the cover having a right side wall and a left side wall secured together spaced laterally from each other and being a mirror image of each other, 
     each side wall having an edge, 
     each side wall having an identical axle keyway opening extending laterally therethrough, 
     each axle keyway opening having an enlarged journaling bore and an entry/exit slot, 
     each slot opens into the bore, extending from the bore to the edge of the respective side wall where the slot is open through the edge of the respective side wall, 
     the cover about each slot being resilient and having an inherent bias to adopt an inherent configuration in which the slot is sized to retain the axle in the bore against removal, 
     the cover about the slot being deflectable from the inherent configuration to deflected conditions which permit passage of the axle through the slot into or out of from the bore for uncoupling of the lever member from the cover, 
     when the lever member is coupled to the cover, the axle of the lever member is received in the bore of each side wall journaled therein for rotation of the lever member about the axle axis relative the cover. Preferably, the edge of each side wall is a rearwardly directed rear edge and each axle keyway opening is proximate an upper rear corner of each side wall. 
     In accordance with a third embodiment, the present invention provides a fluid dispenser having: 
     a housing, 
     a cover assembly removably coupled to the housing, 
     the cover having a right cover side wall and a left cover side wall secured together spaced laterally from each other and being a mirror image of each other, 
     each cover side wall having an upper portion, a lower portion and an intermediate portion spanning between the upper portion and the a lower portion, 
     a top bridging member bridging between the upper portion of the right cover side wall and the upper portion of left cover side wall, 
     the top bridging member comprising a top wall, 
     a bottom bridging member bridging between the lower portion of the right cover side wall and the lower portion of left cover side wall, the bottom bridging member comprising a rod member extending laterally between the right cover side wall and the cover left wall, 
     the housing has a right housing side wall and a left housing side wall, 
     when the cover is coupled to the housing, the right cover side wall is laterally to the right of the right housing side wall, the left cover side wall is laterally to the left of the left housing side wall, and the top wall extends between the right cover side wall and the left cover side wall above the right housing side wall and the left housing side wall, 
     each housing side wall having an edge, 
     each housing side wall having an identical slotway extending laterally therethrough, 
     each slotway extending from an opening where the slot is open through the edge of the respective housing side wall to a blind end, 
     when the cover is coupled to the housing, the rod member extending laterally through both the right housing side wall and the left housing side wall by being located within each of the slotways, when the rod member is within the slotways, the slotways engaging the rod member and guiding relative sliding movement of the lower portion of the cover relative to the housing, 
     wherein the rod member is slidable from the slotways through the openings to disengage the rod member from the slotways. Preferably, the cover when coupled to the housing is movable between a closed lower position in which the dispenser is operative for dispensing fluid and an open upper position in which access is provided to an interior of the housing, 
     in moving between the closed lower position and the open upper position, the cover is guided by the rod member sliding within the slotways. 
     In a fourth aspect, the present invention provides a fluid dispenser having: 
     a housing, 
     a cover assembly removably coupled to the housing, 
     the cover having a right cover side wall and a left cover side wall secured together spaced laterally from each other and being a mirror image of each other, 
     each cover side wall having an upper portion, a lower portion and an intermediate portion spanning between the upper portion and the lower portion, 
     a top bridging member bridging between the upper portion of the right cover side wall and the upper portion of left cover side wall; 
     a bottom bridging member bridging between the lower portion of the right cover side wall and the lower portion of left cover side wall, 
     the intermediate portion of the right cover side wall having a right latch member with a forwardly facing right latch surface, 
     the intermediate portion of the left cover side wall having a left latch member with a forwardly facing left latch surface, 
     the housing having on a right lateral side a right stop member carrying a rearwardly facing right stop surface, 
     the housing having on a left lateral side a left stop member carrying a rearwardly facing left stop surface, 
     the intermediate portion of the right cover side wall being resilient and having an inherent bias to adopt a right inherent condition, the intermediate portion of the right cover side wall being deflectable from the right inherent condition laterally toward the right to right deflected conditions in which the intermediate portion of the right cover side wall is laterally to the right of the right inherent condition, 
     the intermediate portion of the left cover side wall being resilient and having an inherent bias to adopt a left inherent condition, the intermediate portion of the left cover side wall being deflectable from the left inherent condition laterally toward the left to left deflected conditions in which the intermediate portion of the left cover side wall is laterally to the left of the left inherent condition, 
     when the cover is coupled to the housing with the intermediate portion of the right cover side wall in the right inherent condition and the intermediate portion of the left cover side wall in the left inherent condition, the right stop member of the housing interacts with the right latch member with engagement between the forwardly facing right latch surface and the rearwardly facing right stop surface and the left stop member of the housing interacts with the left latch member with engagement between the forwardly facing left latch surface and the rearwardly facing left stop surface preventing uncoupling of the cover from the housing by relative forward movement of the cover relative the housing, 
     when the cover is coupled to the housing with the intermediate portion of the right cover side wall in the right inherent condition and the intermediate portion of the left cover side wall in the left inherent condition, with deflection of the right stop member of the housing to the right deflected condition and deflection of the left stop member of the housing to the left deflected condition, the right latch surface is moved sufficiently to the right to clear the right stop member and the left latch surface is moved sufficiently to the left to clear the left stop member that the cover can be moved forwardly relative the housing. Preferably, the top bridging member comprises a top wall. Preferably, the bottom bridging member comprises a rod member extending laterally between the right cover side wall and the cover left wall. Preferably, the housing has a right housing side wall and a left housing side wall, 
     when the cover is coupled to the housing the right cover side wall is laterally to the right of right housing side wall, the left cover side wall is laterally to the left of housing side wall, and the top wall extends between the right cover side wall and the left cover side wall above the right housing side wall and the left housing side wall. Preferably, each housing side wall having an edge, 
     each housing side wall having an identical slotway extending laterally therethrough, 
     each slotway extending from an opening where the slotway is open through the edge of the respective housing side wall to a blind end, 
     when the cover is coupled to the housing the rod member extending laterally through both the right housing side wall and the left housing side wall by being located within each of the slotways, 
     when the rod member is within the slotways, the slotways engaging the rod member and guiding relative sliding movement of the lower portion of the cover relative to the housing. Preferably, the rod member is slidable from the slideways through the openings to disengage the rod member from the slotways. 
     The present invention provides various concepts including: 
     As concept 1, a fluid dispenser having: 
     a housing, 
     a fluid pump, 
     a cover assembly including a cover and a lever member, 
     the lever member removably coupled to the cover, 
     a cover assembly removably coupled to the housing for coupling and uncoupling of the cover assembly and the housing while the lever is coupled to the cover, 
     when the cover assembly is coupled to the housing, the lever member is accessible for manual engagement by a user for movement of the lever to activate the fluid pump and dispense fluid from the fluid dispenser, 
     the lever member including an axle about an axle axis, 
     the cover having a right side wall and a left side wall secured together spaced laterally from each other and being a mirror image of each other, 
     each side wall having an edge, 
     each side wall having an identical axle keyway opening extending laterally therethrough, 
     each axle keyway opening having an enlarged journaling bore and an entry/exit slot, 
     each slot opens into the bore, extending from the bore to the edge of the respective side wall where the slot is open through the edge of the respective side wall, 
     the cover about each slot being resilient and having an inherent bias to adopt an inherent configuration in which the slot is sized to retain the axle in the bore portion against removal, 
     the cover about the slot being deflectable from the inherent configuration to deflected conditions which permit passage of the axle through the slot into or out of from the bore for uncoupling of the lever from the cover, 
     when the lever member is coupled to the cover, the axle of the lever is received in the bore of each side wall journaled therein for rotation of the lever member about the axle axis relative the cover member. 
     As concept 2, a dispenser as in concept 1, wherein the edge of each side wall is a rearwardly directed rear edge. 
     As concept 3, a dispenser as in concepts 1 or 2 wherein each axle keyway opening is proximate an upper rear corner of each side wall. 
     As concept 4, a dispenser as in concepts 1, 2 or 3 wherein the axle has a left end and a right end, 
     the axle extending laterally to the right through the bore in the right side wall to locate the right end exterior of the cover, 
     the axle extending laterally to the left through the bore in the left side wall to locate the left end exterior of the cover. 
     As concept 5, a dispenser as in concept 4 wherein the lever having an exterior handle portion extending from the right end to the left end forwardly external of the cover to present an engagement portion for manual engagement by a user. 
     As concept 6, a dispenser as in concept 5 wherein the exterior handle portion comprises a U-shaped member with a forward bight forming the engagement portion, a right arm joining the right end of the axle and the bight and a left arm joining the left end of the axle and the bight. 
     As concept 7, a dispenser as in concept 6 wherein the cover defines an interior compartment between the right side wall and the left side wall, 
     the lever having an interior handle portion within the interior compartment of the cover coupled to the axle, 
     when the cover assembly is coupled to the housing, the interior handle portion is coupled to the fluid pump to activate the fluid pump with pivoting of the lever about the axle axis. 
     As concept 8, a dispenser as in concept 7 wherein the cover has a top wall bridging between the right side wall and the left side wall defining the interior compartment therebetween. 
     As concept 9, a dispenser as in concept 8 wherein: 
     the cover is open at a rear of the cover, 
     the lever is removable from being coupled with the cover by rearward movement of the lever moving the axle rearwardly out of the keyhole openings through the rear edges of the side walls and moving the interior handle portion rearwardly within the interior compartment of the cover rearwardly out the open rear of the cover. 
     As concept 10, a dispenser as in concept 9 wherein the exterior handle portion comprises a U-shaped member with a forward bight forming the engagement portion, a right arm joining the right end of the axle and the bight and a left arm joining the left end of the axle and the bight. 
     As concept 11, a dispenser as in concept 10 wherein the right arm and the left arm are spaced laterally to permit the top wall and upper portions of the side walls to pass downwardly and/or forwardly therethrough for coupling and uncoupling of the cover and the lever. 
     As concept 12, a dispenser as in any one of concepts 1 to 11 wherein the axle is received coaxially within the bore against removal under forces less than a threshold force required to deflect the cover about each slot from the inherent configuration to deflected conditions which permit passage of the axle through each slot for removal of the axle from the cover. 
     As concept 13, a dispenser as in any one of concepts 1 to 12 wherein when the cover assembly is coupled to the housing in the closed position, the axle and its axle axis extend horizontally side to side across the housing and the cover assembly. 
     As concept 14, a dispenser as a fluid dispenser having: 
     a housing, 
     a cover assembly removably coupled to the housing, 
     the cover having a right cover side wall and a left cover side wall secured together spaced laterally from each other and being a mirror image of each other, 
     each cover side wall having an upper portion, a lower portion and an intermediate portion spanning between the upper portion and the a lower portion, 
     a top bridging member bridging between the upper portion of the right cover side wall and the upper portion of left cover side wall, 
     a bottom bridging member bridging between the lower portion of the right cover side wall and the lower portion of left cover side wall, 
     the intermediate portion of the right cover side wall having a right latch member with a forwardly facing right latch surface, 
     the intermediate portion of the left cover side wall having a left latch member with a forwardly facing left latch surface, 
     the housing having on a right lateral side a right stop member carrying a rearwardly facing right stop surface, 
     the housing having on a left lateral side a left stop member carrying a rearwardly facing left stop surface, 
     the intermediate portion of the right cover side wall being resilient and having an inherent bias to adopt a right inherent condition, the intermediate portion of the right cover side wall being deflectable from the right inherent condition laterally toward the right to right deflected conditions in which the intermediate portion of the right cover side wall is laterally to the right of the right inherent condition, 
     the intermediate portion of the left cover side wall being resilient and having an inherent bias to adopt a left inherent condition, the intermediate portion of the left cover side wall being deflectable from the left inherent condition laterally toward the left to left deflected conditions in which the intermediate portion of the left cover side wall is laterally to the left of the left inherent condition, 
     when the cover is coupled to the housing with the intermediate portion of the right cover side wall in the right inherent condition and the intermediate portion of the left cover side wall in the left inherent condition, the right stop member of the housing interacts with the right latch member with engagement between the forwardly facing right latch surface and the rearwardly facing right stop surface and the left stop member of the housing interacts with the left latch member with engagement between the forwardly facing left latch surface and the rearwardly facing left stop surface preventing uncoupling of the cover from the housing by relative forward movement of the cover relative the housing, 
     when the cover is coupled to the housing with the intermediate portion of the right cover side wall in the right inherent condition and the intermediate portion of the left cover side wall in the left inherent condition, with deflection of the right stop member of the housing to the right deflected condition and deflection of the left stop member of the housing to the left deflected condition, the right latch surface is moved sufficiently to the right to clear the right stop member and the left latch surface is moved sufficiently to the left to clear the left stop member that the cover can be moved forwardly relative the housing. 
     As concept 15, a dispenser as in concept 14 wherein the top bridging member comprises a top wall. 
     As concept 16, a dispenser as in concept 14 or 15 wherein the bottom bridging member comprises a rod member extending laterally between the right cover side wall and the cover left wall. 
     As concept 17, a dispenser as in concept 16 wherein the housing has a right housing side wall and a left housing side wall, 
     when the cover is coupled to the housing, the right cover side wall is laterally to the right of right housing side wall, the left cover side wall is laterally to the left of housing side wall, and the top wall extends between the right cover side wall and the left cover side wall above the right housing side wall and the left housing side wall. 
     As concept 18, a dispenser as in concept 17 wherein each housing side wall having an edge, 
     each housing side wall having an identical slotway extending laterally therethrough, 
     each slotway extending from an opening where the slotway is open through the edge of the respective housing side wall to a blind end, 
     when the cover is coupled to the housing the rod member extending laterally through both the right housing side wall and the left housing side wall by being located within each of the slotways, 
     when the rod member is within the slotways, the slotways engaging the rod member and guiding relative sliding movement of the lower portion of the cover relative to the housing. 
     As concept 19, a dispenser as in concept 18 wherein the rod member is slidable from the slideways through the openings to disengage the rod member from the slotways. 
     As concept 20, a dispenser as in concept 19 wherein the cover when coupled to the housing is movable between a closed lower position in which the dispenser is operative for dispensing fluid and an open upper position in which access is provided to an interior of the housing, 
     in moving between the closed lower position and the open upper position, the cover is guided by the rod member sliding within the slotways. 
     As concept 21, a dispenser as in concept 20 including a spring biasing the cover upwardly relative the housing to the open upper position. 
     As concept 22, a dispenser as in concept 20 or 21 wherein, when the cover is coupled to the housing, is in the open upper position with the intermediate portion of the right cover side wall in the right inherent condition and the intermediate portion of the left cover side wall in the left inherent condition, with deflection of the right stop member of the housing to the right deflected condition and deflection of the left stop member of the housing to the left deflected condition so that the right latch surface is moved sufficiently to the right to clear the right stop member and the left latch surface is moved sufficiently to the left to clear the left stop member, then the cover can be moved forwardly relative the housing and the cover is pivotable about the rod member in the slotways to move the upper portion of the cover forwardly and downwardly with the top wall to clear the housing and the cover is then movable relative the housing to slide the rod member from the slotways through the openings to disengage the rod member from the slotways. 
     As concept 23, a dispenser as in any one of concepts 20 to 22 wherein the edge of each housing side wall is a downwardly directed bottom edge. 
     As concept 24, a dispenser as in any one of concepts 20 to 23 wherein each slotway extends from the opening upwardly to the blind end. 
     As concept 25, a dispenser as in concept 24 wherein, in moving the cover relative the housing between the closed lower position and the open upper position, the rod member slides upwardly within the slotways with the rod member engaging the blind ends to stop upward movement of the cover relative the housing in the open upper position. 
     As concept 26, a dispenser as in concept 25 wherein, in the closed lower position, the rod member is engaged within the slotways in a position intermediate the blind ends and the openings to the slotways. 
     As concept 27, a fluid dispenser having: 
     a housing, 
     a cover assembly removably coupled to the housing, 
     the cover having a right cover side wall and a left cover side wall secured together spaced laterally from each other and being a mirror image of each other, 
     each cover side wall having an upper portion, a lower portion and an intermediate portion spanning between the upper portion and the lower portion, 
     a top bridging member bridging between the upper portion of the right cover side wall and the upper portion of left cover side wall, 
     the top bridging member comprising a top wall, 
     a bottom bridging member bridging between the lower portion of the right cover side wall and the lower portion of left cover side wall, the bottom bridging member comprising a rod member extending laterally between the right cover side wall and the cover left wall, 
     the housing has a right housing side wall and a left housing side wall, 
     when the cover is coupled to the housing, the right cover side wall is laterally to the right of right housing side wall, the left cover side wall is laterally to the left of the left housing side wall, and the top wall extends between the right cover side wall and the left cover side wall above the right housing side wall and the left housing side wall, 
     each housing side wall having an edge, 
     each housing side wall having an identical slotway extending laterally therethrough, 
     each slotway extending from an opening where the slot is open through the edge of the respective housing side wall to a blind end, 
     when the cover is coupled to the housing the rod member extending laterally through both the right housing side wall and the left housing side wall by being located within each of the slotways, 
     when the rod member is within the slotways, the slotways engaging the rod member and guiding relative sliding movement of the lower portion of the cover relative to the housing, 
     wherein the rod member is slidable from the slideways through the openings to disengage the rod member from the slotways. 
     As concept 28, a dispenser as in concept 27 wherein the cover when coupled to the housing is movable between a closed lower position in which the dispenser is operative for dispensing fluid and an open upper position in which access is provided to an interior of the housing, 
     in moving between the closed lower position and the open upper position, the cover is guided by the rod member sliding within the slotways. 
     As concept 29, a fluid dispenser having: 
     a housing, 
     a cover assembly coupled to the housing for movement between a closed lower position in which the dispenser is operative for dispensing fluid and an open upper position in which access is provided to an interior of the housing, 
     the cover assembly including a cover and a lever member, 
     the lever member including an axle portion with an axle axis, 
     the lever member removably coupled to the cover for pivoting of the lever member relative the cover about axle axis, 
     the cover having a keyway axle slot with an enlarged circular portion enclosed but for being open to a rear edge of the cover as a slot way of reduced width compared to a diameter of the circular portion, 
     the axle portion received coaxially within the axle slot against removal under forces less than a threshold force required to move the axle from the circular portion through the slot way by resilient deflection of the cover about the slotway, 
     when the cover assembly is coupled to the housing in the closed lower position, the axle member and its axle axis extend horizontally side to side across the housing and the cover assembly. 
     As concept 30, a dispenser as in concept 29 wherein: 
     the housing having a releasable cover latching mechanism, the latching mechanism including a rearwardly extending hook member, 
     the hook member removably engaging the axle member when the cover assembly is in the closed lower position to prevent movement of the cover assembly from the closed lower position to the upper open position. 
     As concept 31, a dispenser as in concept 30 wherein the hook member movably mounted to the housing for movement between a latched position in which the hook member engages the axle member when the cover assembly is in the closed lower position to prevent movement of the cover assembly relative the housing from the closed lower position to the upper open position, and an unlatched position in which the hook member is disengaged from the axle member and the cover assembly is movable between the closed lower position and the upper open position. 
     As concept 32, a dispenser as in concept 31 wherein the latching mechanism includes a latch engagement member for engagement by a user to move the hook member between the latched position and the unlatched position. 
     As concept 33, a dispenser as in concept 32 wherein the latching mechanism includes a spring mechanism to urge the hook member to the latched position relative the housing when the hook member is moved away from the latched position toward the unlatched position. 
     As concept 34, a dispenser as in concept 33 wherein the housing has a forward opening providing access to the interior of the housing, 
     the cover covers an upper portion of the forward opening of the housing in the closed upper position. 
     As concept 35, a dispenser as in concept 34 including a pump mechanism within the interior of the housing, 
     when the cover assembly is coupled to the housing in the closed lower position, 
     pivoting of the lever member relative the cover about axle axis activating the pump mechanism to discharge a fluid. 
     As concept 36, a dispenser as in concept 35 wherein the pump mechanism has a dispensing nozzle which extends forwardly beyond the housing for dispensing the fluid downwardly, the cover including a shroud portion overlying the nozzle and at least partially protecting the nozzle from engagement by a user when the cover is in the closed position. 
     As concept 37, a dispenser as in concept 36 wherein: 
     the pump mechanism is coupled to the housing for removal when the cover is in the open position, and prevented from removal when the cover is in the closed position. 
     As concept 38, a dispenser as in concept 37 including a fluid reservoir within the interior of the housing from which fluid is to be dispensed, the reservoir coupled to the pump mechanism with the pump mechanism and reservoir being removable as a unit from the interior for replacement when the cover is in the open position. 
     As concept 39, a dispenser as in concept 38 wherein the housing carries in the interior a support plate for supporting the pump mechanism. 
     As concept 40, a fluid dispenser having: 
     a housing, 
     a cover assembly removably coupled to the housing for coupling and uncoupling of the cover assembly and the housing, 
     when the cover is coupled to the housing, the cover and housing define an interior compartment therebetween, 
     the cover having a right cover side wall and a left cover side wall secured together spaced laterally from each other, the housing has a right housing side wall and a left housing side wall secured together spaced laterally from each other by a housing back wall, 
     when the cover is coupled to the housing, the right cover side wall is laterally to the right of right housing side wall, the left cover side wall is laterally to the left of the left housing side wall, 
     when the cover is coupled to the housing, the right cover side wall engages the right housing side wall and the left cover side wall engages the left housing side wall, 
     to uncouple the cover from the housing, the right cover side wall is deflected laterally away from the right housing side wall and the left cover side wall is deflected laterally away from the left housing side wall. 
     As concept 41, a fluid dispenser as in concept 40 wherein the cover has a top wall bridging between the right side wall and the left side wall and the top wall extends between the right cover side wall and the left cover side wall above the right housing side wall and the left housing side wall. 
     As concept 42, a fluid dispenser as in concept 40 or 41 wherein the cover is open at a rear of the cover, 
     in coupling of the cover assembly and the housing while the right cover side wall is deflected laterally away from the right housing side wall and the left cover side wall is deflected laterally away from the left housing side wall, the housing passes rearwardly through the open rear of the cover, and 
     in uncoupling of the cover assembly and the housing while the right cover side wall is deflected laterally away from the right housing side wall and the left cover side wall is deflected laterally away from the left housing side wall, the housing passes forwardly through the open rear of the cover. 
     As concept 43, a fluid dispenser having a housing and a cover removably coupled to the housing with the cover having a right cover side wall and a left cover side wall secured together spaced laterally from each other and in which the cover side walls are resilient and deflectable laterally away from each other for disengagement of the cover from the housing. 
     As concept 44, a fluid dispenser having a cover including a right cover side wall and a left cover side wall spaced laterally from each other and joined by a top wall and in which a rod member bridges between lower portions of the side walls. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further aspects and advantages of the present invention will become apparent from the following description taken together with the accompanying drawings in which: 
         FIG. 1  is a pictorial view of a fluid dispenser in accordance with a first embodiment of the present invention in an operative position and mounted to a stand; 
         FIG. 2  is a partially exploded pictorial view of  FIG. 1  showing a dispenser assembly, a mounting plate and the stand separately; 
         FIGS. 3, 4 and 5  are, respectively, a front view, a pictorial view and a right side view of the dispenser assembly of  FIG. 2 ; 
         FIG. 6  is a pictorial view of a cover assembly of the dispenser assembly of  FIG. 2 ; 
         FIG. 7  is a pictorial view of a removable cartridge comprising a pump mechanism and a bottle of the dispenser assembly of  FIG. 2 ; 
         FIG. 8  is a pictorial view of a housing assembly of the dispenser assembly of  FIG. 2  as mounted on the mounting plate; 
         FIG. 9  is a rear pictorial view of the cover assembly of  FIG. 6 ; 
         FIG. 10  is a rear exploded pictorial view of a cover and a lever of the cover assembly of  FIG. 6 ; 
         FIG. 11  is a rear pictorial view of an upper rear portion of the cover of  FIG. 10 ; 
         FIG. 12  is a right side view of an upper rear portion of the cover assembly of  FIG. 6 ; 
         FIG. 13  is a rear pictorial view of a left latch member on a left cover side wall of the cover of  FIG. 10  as viewed downwardly and from above; 
         FIG. 14  is an exploded pictorial view of the housing assembly of  FIG. 8  as viewed looking rearwardly and downwardly; 
         FIG. 15  is a pictorial view of a housing from  FIG. 14  as viewed looking rearwardly and upwardly; 
         FIG. 16  is a partial pictorial view of the dispenser assembly of  FIG. 3  with the cartridge coupled to the housing assembly, however, with the cover removed; 
         FIG. 17  is a cross-sectional right side view of the dispenser assembly of  FIG. 3  along section line A-A′ in  FIG. 3 ; 
         FIG. 18  is a pictorial view of the dispenser assembly of  FIG. 1  mounted on the mounting plate in an operative position with the cover assembly in a lower closed position; 
         FIG. 19  is a pictorial view the same as  FIG. 18  but with the cover assembly in an upper open position; 
         FIG. 20  is a pictorial view of the dispenser of  FIG. 19  in which the cartridge has been slid horizontally forwardly to a position to which and from which the cartridge may be slid horizontally, forwardly and rearwardly for respective coupling and uncoupling of the cartridge to the dispenser housing assembly; 
         FIG. 21  is a partial pictorial view similar to  FIG. 16 , however, with the cartridge assembly removed and with the cover assembly shown cross-sectioned along section line A-A′ in  FIG. 3 ; 
         FIG. 22  is a view the same as  FIG. 21 , however, in which a latching engagement member on the housing assembly has been moved to release a cover latching mechanism; 
         FIG. 23  is a pictorial view the same as  FIG. 21 , however, in which the cover assembly has been slid relative to the housing assembly from the lower closed position as shown in  FIGS. 21 and 22  to an upper open position; 
         FIG. 24  is a partial pictorial view of an upper rear portion of the dispenser assembly in the lower closed position shown in  FIG. 3  along a section line B-B′ in  FIG. 3 ; 
         FIG. 25  is an enlarged cross-sectional right side view of the upper rear portion of the dispenser assembly as shown in  FIG. 3  along section line B-B′ in  FIG. 3 ; 
         FIG. 26  is a cross-sectioned right side view of the dispenser assembly of  FIG. 3  along section line C-C′ in  FIG. 3 ; 
         FIG. 27  is a view the same as  FIG. 26 , however, showing the cover in an upper open position relative to the housing assembly as in  FIG. 19  and with the lever removed for ease of illustration; 
         FIG. 28  is a rear cross-sectional view of the dispenser assembly of  FIG. 3  along section line D-D′ in  FIG. 5  with the cover assembly in the lower closed position; 
         FIG. 29  is a rear cross-sectional view the same as  FIG. 28 , however, with the cover assembly in the upper open position as in  FIG. 20 ; 
         FIG. 30  is a cross-sectional top view along section line E-E in  FIG. 28 ; 
         FIG. 31  is a cross-sectional top view along section line F-F′ in  FIG. 29 ; 
         FIG. 32  is a perspective view of the dispenser assembly in  FIG. 20  with the cover assembly in an upper open position; 
         FIG. 33  is a perspective view of the dispenser assembly the same as  FIG. 32  but with an upper portion of the cover assembly disengaged from the housing assembly and the cover assembly tilted forwardly; 
         FIG. 34  is a pictorial view the same as  FIG. 33 , however, showing the cover assembly as disengaged from the housing assembly; and 
         FIG. 35  is a rear pictorial view the same as  FIG. 29 , however, with the side walls of the cover deflected to be spaced laterally further apart from each other than in  FIG. 29 . 
     
    
    
     DETAILED DESCRIPTION OF THE DRAWINGS 
     Reference is made to  FIGS. 1 and 2  which illustrate a dispenser  9  in accordance with the present invention including a dispenser assembly  10  mounted to a vertical face of a stand  11 . As seen in  FIG. 2 , the dispenser  9  includes a backplate  12  to be secured to the stand  11  and the dispenser assembly  10  is removably secured to the backplate  12 . 
     The dispenser assembly  10  contains three principal components, namely, a cover assembly  14  as shown in  FIG. 6 , a cartridge  15  as shown in  FIG. 7  and a housing assembly  16  as shown in  FIG. 8 . 
     As seen in  FIGS. 6 and 9 , the cover assembly  14  includes a cover  18 , a lever  19  and a rod member  20 . Referring to  FIG. 9 , the cover  18  includes a top wall  21 , a right cover side wall  22  and a left cover side wall  23 . The right cover side wall  22  and the left cover side wall  23  are secured together spaced laterally from each other by being connected at an upper end by the top wall  21  and a lower end by the rod member  20 . The rod member  20  is preferably a cylindrical member bridging between the side walls  22  and  23  and each end of the rod member  20  is fixedly secured within a blind bore in a lower portion  26  of each of the side walls  22  and  23 . In the preferred embodiment, the cover assembly  14  including the cover  18  and the lever  19  is each symmetrical about a central longitudinal plane along section line A-A′ in  FIG. 3 . Each of the side walls  22  and  23  has a top portion  24  and a lower portion  26  with an intermediate portion  25  bridging between the top portion  24  and the lower portion  26 . 
     As best seen in  FIG. 11 , in the top portion  24  of each of the side walls  22  and  23 , there is provided an identical axle keyway opening  27  that extends laterally through the respective side wall  22  and  23 . Each axle keyway opening  27  has an enlarged journaling bore  28  and entry/exit slot  29 . Each slot  29  is open into the bore  28 , extends from the bore  28  to a rear edge  30  of each of the side walls  22  and  23  where each slot  29  is open through the edge  30 . 
     The cover  18  about each slot  29  is resilient and has an inherent bias to adopt an inherent configuration as shown in  FIGS. 11 and 12 . The cover  18  about each slot  29  is deflectable from the inherent configuration to deflected conditions in which the slots  29  increase in width to permit the coupling and uncoupling of the lever  19  with the cover  18 . 
     Referring to  FIG. 10 , the lever  19  has an exterior handle portion  32 , an axle  31  and an interior actuator portion  33 . The exterior handle portion  32  comprises a U-shaped member with a forward bight  34  which merges rearwardly into a right arm  36  and a left arm  37 . The right arm  36  is connected at its rear to an outer right end  38  of a right segment  40  of the axle  31 . The left arm  37  extends rearwardly to join with an outer left end  39  of a left segment  41  of the axle  31 . The axle  31  including both the right segment  40  and the left segment  41  is coaxial about an axle axis  35 . The interior actuator portion  33  includes a right activator rod  42  which extends forwardly from an inner right end  44  of the right segment  40  of the axle  31 . The interior actuator portion  33  includes a left activator rod  43  which extends forwardly from an inner left end  45  of the left segment  41  of the axle  31 . The right activator rod  42  and the left activator rod  43  are disposed in the same plane. 
     The lever  19  is removably coupled to the cover  18  by reason of the axle  31  of the lever  19  being removably coupled within the axle keyway openings  27  in the side walls  22  and  23 . The bore  28  of each keyway opening  27  is sized to receive the axle  31  of the lever  19  therein and journal the lever  19  for rotation of the lever  19  about the axle axis  35  relative the cover  18 . The right segment  40  of the axle  31  is received within the bore  28  of the keyway opening  27  of the right cover side wall  22  and the left segment  41  of the axle  31  is received within the bore  28  of the keyway opening  27  of the left cover side wall  23 . 
     The axle  31  is removably received within the bores  28  in a snap-fit. The cover  18  about each slot  29  is resilient with its inherent bias adopting the inherent configuration as seen in  FIGS. 11 and 12  in which the slot  29  is sized to retain the axle  31  in the bore  29  against removal. The cover  18  about the slot  29  is deflectable from the inherent configuration to deflected conditions which permit passage of the axle  31  through the slot  29  either into or out from the bore  29  for coupling and uncoupling of the lever  19  and the cover  18 . The axle  31  is received coaxially within the bores  28  of the keyway openings  27  against removal under forces less than a threshold force required to deflect the cover  18  about each slot  29  from the inherent condition to deflected conditions which permit passage of the axle  31  through each slot  29  for removal of the axle  31  from the keyway openings  27  of the cover  18 . The cover assembly  14  is removably coupled to the housing assembly  16  for coupling and uncoupling of the cover assembly  14  to the housing assembly  16  while the lever  19  is coupled to the cover  18 . After the cover assembly  14  is uncoupled from the housing assembly  16 , the lever  19  and the cover  18  may be disengaged and separated from each other by removing the axle  31  from the keyway openings  27 . 
     The cover  18  defines an interior compartment  46  between the right cover side wall  22  and the left cover side wall  23 . When the lever  19  is coupled to the cover  18  with the axle  31  journalled in keyway openings  27 , the interior actuator portion  33  is within the interior compartment  46  coupled to the axle  31  and the exterior handle portion  32  extends forwardly exterior of the interior compartment  46 . The lever  19  is removable from being coupled with the cover  18  by rearward movement of the lever  19  moving the axle  31  rearwardly out of the keyway openings  27  through the rear edges  30  of the side walls  22  and  23 , moving the interior actuator portion  33  rearwardly from within the interior compartment  46  out the open rear of the cover  18 . The right arm  36  and the left arm  37  of the exterior handle portion  32  are spaced laterally so as to permit the top wall  21  and top portions  24  of the side walls  22  and  23  of the cover  18  to pass downwardly and forwardly between the right arm  36  and the left arm  37  to assist coupling and uncoupling of the lever  19  with the cover  18 . In the preferred embodiment, as shown in  FIG. 10 , the cover  18  is open at a rear of the cover and the keyway openings  27  are open to the rear edge  30  of the cover  18 . 
     Referring to  FIGS. 9 and 13 , on the intermediate portion  25  of the right cover side wall  22 , there is provided a right latch member  48  and on the intermediate portion  25  of the left cover side wall  23 , there is provided a left latch member  49 . Each of these latch members  48  and  49  extend laterally inwardly. The left latch member  49  is fixedly secured at a laterally outer end  51  to the left cover side wall  23  and extends laterally inwardly from the outer end  51  laterally inwardly to a distal inner end  55  formed as an enlarged bulbous portion  57  which presents a laterally outward facing side surface  59  merging into a rearwardly facing latch surface  61 . The left latch member  49  has a forward facing latch surface  53 . A reduced thickness portion  63  is defined between the forwardly facing latch surface  53  and the rearwardly facing latch surface  61 . Similarly, as seen in  FIG. 30 , the right latch member  48  is fixedly secured at a laterally outer end  50  to the right cover side wall  22  and extends laterally inwardly from the outer end  50  laterally inwardly to a distal inner end  54  formed as an enlarged bulbous portion  56  which presents a laterally outward facing side surface  58  merging into a rearwardly facing latch surface  60 . The right latch member  48  has a forward facing latch surface  52 . A reduced thickness portion  62  is defined between the forwardly facing latch surface  52  and the rearwardly facing latch surface  60 . 
     Reference is made to  FIGS. 8, 14 and 15 .  FIG. 8  shows the housing assembly  16  in an assembled condition.  FIG. 14  shows the housing assembly  16  in an exploded condition. As seen in  FIG. 14 , the housing assembly  16  includes a housing  70 , a hook bracket  71 , a pair of right and left hook springs  72  and  73 , a latch engagement member or button  74 , a pump actuator plate  75 , a pair of right and left plate springs  76  and  77  and a pair of right and left cover lift springs  78  and  79 . 
     The housing  70  has a housing right side wall  200  and a housing left side wall  201  which are fixedly secured together as joined by a partial back wall  202  and a partial front wall  203 , each of which bridges between the housing side walls  200  and  201 . Proximate an upper end of the housing side wall, a horizontal support flange  204  extends horizontally between the housing side walls and is secured to the back wall  202 . A slot  205  extends from an opening in a front edge  206  of the support flange  204  rearwardly to a blind rear end  207 . A pair of left and right vertical guide walls  120  and  121  extend forwardly from the back wall  202  on either side of the slot  205 . Forward from the end  207  of the slot  205 , horizontally extending channelways  118  and  119  separate each of the vertical guiding walls  120  and  121  from the support flange  204 . The housing right and left side walls  200  and  201  carry vertically extending channels  214  and  215  which are to receive laterally extending left and right slide members  216  and  217  on the pump actuator plate  75  so as to couple the pump actuator plate  75  to the housing  70  for relative vertical sliding. The right and left plate springs  76  and  77  are disposed between the support flange  204  and the pump actuator plate  75  to bias the pump actuator plate  75  to an upper position in the channels  214  and  215  and to permit but resist downward movement of the actuator plate  75  to lower positions within the channels  214  and  215 . 
     Proximate the upper rear, each of the housing right side wall  200  and the housing left side wall  201  carry respective right and left stub axles  220  and  221  that extend laterally outwardly. The hook bracket  71  includes a central bridge member  230  which joins a right side arm  232  to a left side arm  233 . The right side arm  232  has a bore  234  laterally therethrough to be engaged on the right stub axle  220  and the left side arm  233  has a bore  235  to engage on the left stub axle  221  so as to mount the hook bracket  71  to the housing  70  for pivoting about a horizontal hook axis  222  coaxial of the stub axles  220  and  221 . The right hook spring  72  is disposed between the housing  70  and the right side arm  232  to bias the bridge member  230  rearwardly. Similarly, the left hook spring  73  is disposed between the housing  70  and the left side arm  233  to bias the bridge member  230  rearwardly. The bridge member  230  carries a right hook  236  and a left hook  237 . 
     As seen in pictorial view in  FIG. 21  and in side view in  FIG. 17 , the bridge member  330  of the hook bracket  71  carries a cam plate  238  with an upwardly directed cam surface  239  that extends at an angle upwardly and forwardly away from the bridge member  230 . 
     The back wall  202  of the housing  70  carries at its upper end centrally located between the housing right and left side walls a button guide member  242  providing a vertically extending channelway  243 . The button  74  includes an enlarged top portion  245  and a stem  246  which extends downwardly from the top portion  245 . The cover  18  is shown as having a button opening  247  vertically therethrough. The top portion  245  of the button  74  has a complementary shape to the button opening  247  such that when in a closed position as, for example, shown in  FIGS. 4 and 21 , an upwardly directed surface of the button  74  is coplanar with an upwardly directed surface of the top wall  21  of the cover  18 . The button  74  may be manually engaged through the button cover opening  247  to move the button  74  downwardly. The stem  246  of the button  74  is coupled to the button guide member  242  received in the channelway  243  to limit the button  74  to vertical sliding movement and against uncoupling. 
     As is best seen in  FIG. 17 , the stem  246  of the button  74  carries a camming surface  248  for engagement with the cam surface  239  on the cam plate  238  of the hook bracket  71 . With downward movement of the button  74 , the camming surface  248  of the stem  246  of the button  74  engages the cam surface  239  of the cam plate  238  on the hook bracket  71  so as to pivot the hook bracket  71  about the hook axis  222  moving the right and left hooks  236  and  237  forwardly from a latched position as shown in  FIG. 24  to a unlatched position as shown in solid lines in  FIG. 25 . 
       FIG. 16  illustrates the dispenser assembly  10  in an operative condition ready for use to dispense fluid, however, with the cover  18  removed. As can be seen in  FIG. 16 , the right and left hooks  236  and  237  of the hook bracket  71  engage on the lever axle  31  to prevent movement of the lever axle  31  forwardly or upwardly. The condition of  FIG. 16  is also shown in  FIG. 24  in cross-section with the left hook member  237  engaged on the left segment  41  of the lever axle  31 . From the operative condition of  FIG. 16  on a user engaging the button  74  and forcing the button  74  downwardly, with downward movement of the button  74 , the hook bracket  71  is pivoted about the hook axis  222  relative to the housing  70  to pivot both the right hook  236  and the left hook  237  from the latched condition on the lever axle  31 . As shown in  FIG. 24 , the left hook  237  is engaged about the left segment  41  of the axle  31  and on pivoting the hook bracket  71  forwardly, the left hook  237  is moved to an unlatched condition as shown in solid lines in  FIG. 25  in which the left hook  253  is disposed forwardly of the left segment  41  of the axle  31 . 
     Referring to  FIG. 14 , each of the right and left housing side walls  200  and  201  carry a respective right and left rod receiving slotways  260  and  261  open at open ends  266  and  267  in bottom edges  262  and  263  of the housing side walls  200  and  201  and extending vertically upwardly to respective blind ends  264  and  265 . The rod receiving slotways  260  and  261  are sized so as to receive the rod member  20  of the cover  18  therein and locate the right cover side wall  22  laterally to the right outwardly of the housing right side wall  200  and the left cover side wall  23  laterally to the left outwardly of the housing left side wall  201 . When the rod member  20  is within the rod receiving slotways  260  and  261 , the slotways  260  and  261  engage the rod member  20  and guide relative sliding movement of the rod member  20  relative to the housing  70 . The rod member  20  may pass inwardly and outwardly through the open ends  266  and  267  of the slotways  260  and  261  to disengage the rod member  10  from the slotways  260  and  261  or to engage the rod member  20  in the slotways  260  and  261 . The housing  70  is symmetrical about the longitudinal central axis A-A′ in  FIG. 3  with each of the right and left housing side walls  200  and  201  being mirror images of the other. 
     Reference is made to  FIGS. 14, 15, 30 and 31  to describe left and right slide grooves  270  and  271  which extend laterally through the respective left and right housing side walls  200  and  201  proximate the back wall  202  of the housing  70 . Each of the slide grooves  270  and  271  extend vertically from bottom ends  276  and  277  to top ends  278  and  279 . Each of the slide grooves  270  and  271  has a rearwardly directed front surface  280  and  281  disposed in the same flat vertical plane. Over upper portions  272  and  273  of each slide groove  270  and  271 , respectively, each slide groove has a forwardly directed upper rear surface  282  and  283  which is vertical and spaced rearwardly from the respective front surfaces  280  and  281  by a first distance. Over a lower portion  274  and  275  of each slide groove  270  and  271 , respectively, each slide groove has a forwardly directed lower rear surface  284  and  285  spaced rearwardly from the respective front surface  280  and  281  by a second distance less than the first distance. The first distance and the vertical dimension of the upper portions  272  and  273  of the guide grooves  270  and  271  are selected so as to permit the respective right and left latch members  48  and  49  carried on the right and left cover side walls  22  and  23  to slide laterally through the respective upper portions  272  and  273  of the slide grooves  270  and  271  when the right and left locking members  48  and  50  are vertically and horizontally aligned with the upper portions  272  and  273  of the slide grooves  270  and  271  as occurs when the cover assembly  14  is engaged on the housing assembly  16  in the upper open position shown, for example, in  FIG. 27  in right side view, in  FIG. 32  in pictorial view and in cross-section in rear views in  FIGS. 29 and 35 . 
     At least the intermediate portion  25  of the right cover side wall  22  of the cover  18  is resilient and has an inherent bias to adopt a right inherent condition as illustrated in all of the Figures showing the cover  18  other than  FIG. 35 . The right cover side wall  22  is shown in its right inherent condition, for example, in a cross-sectional rear view in  FIG. 29 . In  FIG. 29 , the cover assembly  14  is in the upper open position relative the housing assembly  16  and the right cover side wall  22  is laterally to the right of the right housing side wall  200  and the right latch member  48  extends through the right housing side wall  200  via the upper portion  272  of the right guide groove  270 . The right cover side wall  22  is deflectable from the right inherent condition as shown in  FIG. 29  to right deflected conditions in which the intermediate portion  25  of the right cover side wall  22  is laterally to the right of the right inherent condition. One such right deflected condition is illustrated in  FIG. 35  in which the right cover side wall  22  is laterally to the right of the housing right side wall  200  and the right latch member  48  carried on the right cover side wall  22  is laterally to the right of the right housing side wall  200 . Similarly, at least the intermediate portion  25  of the left cover side wall  23  of the cover  18  is resilient and has an inherent bias to adopt a left inherent condition as illustrated in all of the Figures other than  FIG. 35 . The left cover side wall  23  is shown in its left inherent condition, for example, in a cross-sectional rear view in  FIG. 29 . In  FIG. 29 , the left cover side wall  23  is disposed laterally to the left of the housing left side wall  201  and the left latch member  49  extends through the left housing side wall  201  via the upper portion  273  of the left guide groove  271 . The left cover side wall  23  is deflectable from the left inherent condition as shown in  FIG. 29  to left deflected conditions in which the intermediate portion  25  of the left cover side wall  23  is laterally to the left of the left inherent condition. One such left deflected condition is illustrated in  FIG. 35  in which the left cover side wall  23  is laterally to the left of the housing left side wall  201  and the left latch member  49  carried on the left cover side wall  23  is laterally to the left of the housing left side wall  201 . 
     From the condition of  FIG. 29 , by manually urging the intermediate portions  25  of the left and right cover side walls  22  and  23  laterally outwardly away from each other, the right latch member  48  and the left latch member  49  move laterally away from each other laterally through and out of engagement with the right and left upper portions  272  and  273  of the right and left guide grooves  270  and  271  to assume the deflected conditions illustrated in  FIG. 35 . In  FIG. 35 , the rod member  20  of the cover  18  is received in the rod receiving slotways  260  and  261  in the right and left housing side walls  200  and  201 . In the condition of  FIG. 35 , the cover assembly  14  is merely engaged with the housing assembly  16  by reason of the rod member  20  being received within the slot receiving slotways  260  and  261 . While maintaining the right and left cover side walls  22  and  23  in deflected positions as in  FIG. 35 , from the condition of  FIG. 35 , the cover assembly  16  may be pivoted about the rod member  20  within the rod receiving slotways  260  and  261  to pivot an upper end of the cover assembly  14  forwardly until the right and left latch members  48  and  49  are forward of the right and left housing side walls  200  and  201  as shown in  FIG. 33 . The right and left side walls  22  and  23  may then be released and permitted to return under their inherent bias to the right and left inherent positions. From the position of  FIG. 33 , the cover assembly  14  may be manipulated such that the rod member  20  is slid downwardly in the rod receiving slotways  260  and  261  and out the open ends  266  and  267  to totally disengage the cover assembly  14  from housing assembly  16  and assume a disengaged condition as illustrated in  FIG. 34 . 
     Reference is made to  FIG. 31  which illustrates a top cross-sectional view along section line F-F′ in  FIG. 29  showing the left and right latch members  48  and  49  within the upper portions  272  and  273  of the slide grooves  270  and  271  with each of the right and left cover side walls  22  and  23  in their inherent condition. As can be seen, the first distance separating the front surfaces  280  and  281  from the upper rear surfaces  282  and  283  is sufficient to permit the enlarged bulbous portions  56  and  57  at the distal inner ends  54  and  55  of the right and left latch members  48  and  49  to be slid laterally outwardly through the upper portions  272  and  273  of the slide grooves  270  and  271 . 
       FIG. 29  illustrates a cross-sectional rear view in which the cover assembly  14  is in the upper open position relative to the housing assembly  16 . From the upper open position of  FIG. 29 , the cover assembly  14  is slidable relative to the housing assembly  16  to a lower closed position as illustrated in  FIG. 28 . In  FIG. 28 , the right and left latch members  48  and  49  on the cover side walls  22  and  23  have been slid downwardly from the upper portions  272  and  273  of the slide grooves  270  and  271  into the lower portions  274  and  275  of the slide grooves  270  and  271 . In the lower portions  274  and  275 , the second distance between the front surfaces  280  and  281  and the lower rear surfaces  284  and  285  is selected to be marginally greater than the thickness of the reduced thickness portions  62  and  63  of the right and left latch members  48  and  49  and less than the front to rear dimension of the bulbous portions  56  and  57  at the distal inner ends  54  and  55  of the right and left latch members  48  and  49 . Thus, as seen in  FIG. 30  which is a top cross-section through  FIG. 28 , when in the lower closed position, the left and right latch members  48  and  49  are prevented from being moved laterally outwardly through the lower portions  272  and  273  of the guide grooves  270  and  271 . 
     Reference is made to  FIGS. 14 and 15  which show a left lift spring socket  301  to retain the left cover lift spring  79  at a location that an upper end of the left cover lift spring  79  engages a bottom edge  297  of the left latch member  49  to urge the left latch member  49  upwardly within the left slide groove  271 . The left lift spring socket  301  has an inner side wall  303  bridging between the housing left side wall  201  and the back wall  202 . The left lift spring socket  301  is closed at a lower end by a bottom wall  305  and is partially closed at an upper end by a partial top wall  307 . An upper opening  309  is provided into the left lift spring socket  301  past the partial top wall  307  via which the left cover lift spring  79  may be forced such that the left cover lift spring  79  comes to be received extending axially vertically within the left lift spring socket  301  with the lower end of the left cover lift spring  79  engaged on the bottom wall  305  and the left cover lift spring  79  being prevented from being removed from the left lift spring socket  301  by engagement of the upper end of the left cover lift spring  79  with the partial top wall  307 . The opening  309  of the left lift spring socket  301  is of a size to permit the left latch member  49  on the cover  18  disposed within the left slide groove  271  to slide downwardly into the left lift spring socket  301  into engagement with the upper end of the left cover lift spring  79 . As shown in  FIGS. 30 and 31 , a right lift spring socket  300  is provided on the right housing side wall  200  as a mirror image of the left lift spring socket  301  to receive the right cover lift spring  78 . An upper opening  308  of the right lift spring socket  300  is of a size to permit the right latch member  48  on the cover  18  disposed within the right slide groove  270  to slide downwardly into the right lift spring socket  300  into engagement with the upper end of the right cover lift spring  79 . The right lift spring socket  300  similarly has an inner side wall  302 , a partial top wall and is closed by a bottom wall. 
     Coupling of the cover assembly  14  to the housing assembly  16  is now described with reference to  FIGS. 32 to 35 .  FIG. 34  illustrates a condition in which the cover assembly  14  is separate, disengaged and uncoupled from the housing assembly  16 . From the position of  FIG. 34 , the cover assembly  14  is manually moved so as to move the rod member  20  upwardly into the opening ends  266  and  267  of the rod receiving slotways  260  and  261  and to then, with the upper end of the cover assembly  14 , tilted upwardly and forwardly from the rod member  20 , slide the rod member  20  upwardly in the rod receiving slotways  260  and  261  until the rod member engages the upper blind ends  264  and  265  of the rod receiving slotways  260  and  261  and the cover assembly  14  assumes the position shown in  FIG. 33 . As seen in  FIG. 33 , each of the right and left cover side walls  22  and  23  are disposed laterally outwardly of the right and left housing side walls  200  and  201 . From the position of  FIG. 33 , with the rod member  20  engaged with the blind ends  264  and  265  of the rod receiving slotways  260  and  261 , the cover assembly  14  is pivoted about the rod member  20  rearwardly at the same time that deflecting forces are applied to each of the right and left cover side walls  22  and  23  to urge them laterally outwardly away from each other to adopt the deflected condition shown in  FIG. 35  such that with pivoting of the cover assembly  14  about the rod member  20 , the right and left latch members  48  and  49  pass laterally outwardly of the right and left housing side walls  200  and  201  to the position shown in  FIG. 35  in which the right and left latch members  48  and  49  are laterally aligned with the right and left upper portions  272  and  273  of the right and left guide grooves  270  and  271 . When so aligned, the deflecting forces applied to the right and left cover side walls  22  and  23  are released. Due to the inherent resiliency of each of the cover side walls  22  and  23 , on release of the deflecting forces, the right and left cover side walls  22  and  23  move from the deflected condition of  FIG. 35  to the inherent condition of  FIG. 29  with the right and left latch members  48  and  49  to pass laterally inwardly into the upper portions  272  and  273  of the slide grooves  270  and  271  and assume the position shown in  FIG. 31 . The cover assembly  14  is now coupled to the housing assembly  16  in an upper open position as shown, for example, in  FIG. 32 . 
     Removal of the cover assembly  14  from the housing assembly  16  is accomplished by reversing the steps described above so as in sequence to adopt the configurations shown in  FIG. 32 , then in  FIG. 33  and finally in  FIG. 34 , with the cover side walls  22  and  23  being deflected to the deflected condition of  FIG. 35  during the movement from the position of  FIG. 32  to the position of  FIG. 33 . 
     In  FIG. 32 , the carriage assembly  14  is coupled to the housing assembly  16  in an upper open position that is also shown in  FIGS. 19 and 20  as well as  FIGS. 23, 27, 29 and 31 . 
     With the cover assembly  14  coupled to the housing assembly  16 , the cover assembly  14  is vertically slidable relative the housing assembly  16  from the upper open position of  FIG. 32  to the lower closed position shown in  FIG. 18 . The cover assembly  14  is shown coupled to the housing assembly  16  in the lower closed position not only in  FIG. 18  but also in each of  FIGS. 1 to 5, 16 to 18, 21, 24, 26, 28 and 30 . In moving between the lower closed position of  FIG. 18  and the upper open position of  FIG. 19 , the cover assembly  14  is slidably guided relative to the housing assembly  16  by reason of: (a) the rod member  20  on the lower portions  26  of the cover side walls  22  and  23  being guided within the rod receiving slotways  260  and  261  in the housing side walls  200  and  201  concurrently with (b) the left and right latch members  48  and  49  on the intermediate portions  25  of the cover side walls  22  and  23  being guided within the slide grooves  270  and  271  of the housing side walls  200  and  201 . 
     In such relative sliding of the cover assembly  14  relative to the housing assembly  16 , while the left and right latch members  48  and  49  are within the lower portions  274  and  275  of the guide grooves  270  and  271 , the left and right cover lift springs  78  and  79  engage the left and right latch members  48  and  49  and bias the cover assembly  14  to move upwardly to the upper open position. 
     In the lower closed position, the left and right hooks  236  and  237  on the hook bracket  71  engage on the axle  31  of the lever  19  to retain the cover assembly  14  in the lower closed position against upward movement of the cover assembly  14  relative to the housing assembly  16 . The engagement of the left and right hooks  236  and  237  of the hook bracket  71  carried by the housing  770  onto the axle  31  of the lever  19  is clearly shown in  FIG. 16  albeit with the cover  18  removed for ease of illustration. The engagement of the left hook  237  of the bracket member  71  on the left segment  41  of the axle  31  with the cover in the lower closed position is clearly shown in cross-section in  FIG. 24 .  FIG. 21  also shows the cover assembly  16  in the lower closed position relative to the housing assembly  16  in which the hooks  236  and  237  engage on the axle  31  of the lever  19 . In the lower closed position as shown in  FIG. 21 , a user manually pushes the button  74  downwardly through the button opening  247  of the cover  18 . With downward movement of the button  74 , the button camming surface  248  engages the cam surface on the cam plate of the hook bracket  71  pivoting the hook bracket  71  about the stub axles  220  and  221  against the bias of the hook springs  72  and  73  so as to pivot the left and right hooks  236  and  237  forwardly relative to the axle  31  to assume a forward disengaged position relative the axle  31  as illustrated in the cross-section of  FIG. 25  showing the left hook  237  in a forwardly pivoted disengaged position spaced forwardly from the axle  31 . 
     On the left and right hooks  236  and  237  coming to disengage from the axle  31  by the forward rotation of the hook bracket  71  to the position shown, for example, in  FIGS. 22 and 25 , under the forces applied by the right and left cover lift springs  78  and  79  on the right and left latch member  48  and  49 , the cover assembly  14  is slid upwardly from its lower closed position of  FIG. 22  to the upper open position as seen in  FIG. 23 . With the manual disengagement of the button  74  after the axle  31  has passed vertically upwardly past the hooks  236  and  237 , the hook bracket  71  is pivoted under the bias of the right and left hook springs  72  and  73  to which rearward position shown in  FIG. 24  and in dashed lines in  FIG. 25 . 
     To move the cover assembly  14  relative to the housing assembly  16  from the upper open position, for example, as shown in  FIG. 23  to the lower closed position, the user manually engages the top wall  21  of the cover  18  and forces cover  18  vertically downwardly against the bias of the right and left cover lift springs  78  and  79 . With this vertical downward movement, the axle  31  of the lever  19  moves vertically downwardly with the axle axis  32  moving along a dotted line  299  shown in  FIG. 25 . In such downward movement, the axle  31  as schematically shown in broken lines in  FIG. 25 , engages upwardly directed exterior camming surfaces  296  and  297  on the right and left hooks  236  which engagement with downward movement of the axle  31  biases the right and left hooks  256  and  257  and thereby the hook bracket  71  to pivot about the stub axles  220  and  221  forwardly to the forward position shown in solid lines in  FIG. 25  against the bias of the right and left hook springs  72  and  73 . Once the axle  31  has moved downwardly passed the left and right hooks  236  and  237 , the hook bracket  71  moves under the bias of the right and left hook springs  72  and  73  from the forward position to the rear position shown in broken lines in  FIG. 25  to latch onto the axle  31  holding the cover assembly  14  in the lower closed position relative to the housing assembly  16  as illustrated, for example, in  FIG. 24 . 
     Thus, as explained above, the cover assembly  14  is coupled to the housing assembly  16  for movement between the closed lower position and an open upper position. The housing assembly  16  has a releasable cover latching mechanism formed by the pivotally mounted hook bracket  71 , the right and left hooks  236  and  237 , the hook springs  72  and  73 , the cam plate  238  as well as the button  74  and the button guide member  242 . 
     Reference is made to  FIG. 7  which illustrates a cartridge  15  comprising a pump mechanism  100  and a fluid containing bottle  101 . As illustrated in  FIGS. 19 and 20 , when the cover assembly  14  is in the upper open position relative to the housing assembly  16 , by relative horizontal movement of the cartridge  15 , the cartridge  15  may be moved horizontally forwardly and rearwardly between a disengaged uncoupled condition in front of the dispenser assembly  10  as seen in  FIG. 20  and to a coupled orientation seen in  FIG. 19 . With the cartridge  15  in the coupled orientation as in  FIG. 19 , the cover assembly  14  may be moved relative the housing assembly  16  from the upper open condition of  FIG. 19  to the lower closed position of  FIG. 18  capturing the cartridge  15  within the dispenser assembly  10  against removal and locating the cartridge assembly  15  in an operative position for dispensing of fluid from the bottle  101  of the cartridge  15  by activation of the pump mechanism  100  with the lever  19 . 
     Reference is made to  FIG. 17  illustrating a cross-sectional view along longitudinal center line A-A′ in  FIG. 3  showing the cartridge  15  coupled within the dispenser assembly  10  with the cover assembly  14  in the lower closed position relative to the housing assembly  16  in an operative condition ready for operation of the dispenser assembly  10  to dispense fluid. This operative condition is also illustrated in the pictorial view of  FIG. 16 , however, with the cover  18  removed for purposes of illustration. 
     The bottle  101  is enclosed by four side-by-side side walls  102  and a bottom wall  103  and is open merely through an opening  104  at the top of a cylindrical neck  105  extending upwardly from a top wall  106 . The pump mechanism  100  includes notably a piston chamber-forming body  110  and a piston-forming element  111 . The piston-forming element  111  is coaxially slidable about a vertical axis relative to the piston chamber-forming body  110  to draw fluid from the bottle via a dip tube  112  connected to the piston chamber-forming body  110  and discharge the fluid from a downwardly directed discharge outlet  113  carried at the front end of a forwardly extending discharge tube  114  that extends forwardly from and is carried by the piston-forming element  111 . 
     When the cover assembly  14  is in the raised upper position relative the housing assembly  16 , the cartridge  15  is horizontally slidable rearwardly to engage with the housing assembly  16  such that the bottle  101  comes to be received within a compartment  115  defined within the housing  70  intermediate the housing left and right side walls  200  and  201 , forwardly of the back wall  202  and between the horizontal support flange  202  and a bottle support flange  116  that bridges between the housing side walls  200  and  201  with the bottom of the bottle  101  engaged and supported by the bottle support flange  116 . The piston chamber-forming body  110  carries a horizontally extending support plate  117  that extends laterally to the left and the right. External portions of the piston-forming element  111  extend upwardly from the piston chamber-forming body  110  above the support plate  117 . The pump mechanism  100  is slid rearwardly into engagement with the support flange  202  of the housing  70  into the slot  204  of the support flange  202  with the support plate  117  of the piston chamber-forming body  110  above the support flange  202  and extending laterally through the channelways  118  and  119  between the horizontal support flange  204  and the right and left vertical guide walls  120  and  121 . In this manner, the piston chamber-forming body  110  is fixedly secured to the housing  70  against vertical movement. 
     The piston-forming element  111  is vertically slidably engaged within the piston chamber-forming body  110  for coaxial vertical reciprocal sliding about a vertical axis and with an internal spring (not shown) biasing the piston-forming element  111  vertically upward relative to the piston chamber-forming body  110 . As shown in  FIG. 17 , the piston-forming element  111  is disposed vertically below the pump actuator plate  75 . To dispense fluid with the dispenser assembly  10  in the orientation shown in  FIG. 17  a user engages the exterior handle portion  32  of the lever  19  and moves the exterior handle portion  32  of the lever  19  downwardly pivoting the lever  19  relative to the housing  70  about the axle axis  35  which moves the forward ends of the right and left actuator rods  42  and  43  of the interior actuator portion  33  of the lever  19  downwardly causing the actuator plate  75  to slide vertically downwardly against the bias of the left and right plate springs  76  and  77  and move the piston-forming element  111  vertically downwardly relative to the piston chamber-forming body  10 , dispensing fluid from the bottle  101  out the discharge outlet  113  onto a user&#39;s hand disposed underneath the outlet  113 . On release of the lever  19  by the user, under the bias of the left and right plate springs  76  and  77 , the pump actuator plate  75  returns to the raised position and pivots the lever  19  to return to the position shown in  FIG. 17 . The pump spring biases the piston-forming element  111  to return to a raised position as shown in  FIG. 17 . 
     The cartridge  15  is adapted to be removed and replaced preferably by a new cartridge, however, possibly with the bottle  101  being removed from the cartridge  15  and refilled. Removal and replacement of the cartridge  15  is possible as is removal and replacement of merely the pump mechanism  100  or merely the bottle  101 . Removal and replacement is carried out with the cover assembly  14  in the upper open opposition relative the housing assembly as seen in  FIGS. 19 and 20 . 
     After use of the dispenser assembly  10  for periods of time, portions of the dispenser assembly  10  which may be engaged by users may become contaminated as with pathogens and the like. Preferably, from time to time, the cover assembly  14  is removed from the housing assembly  16  and the cover assembly may then be suitably cleaned as preferably by being placed in an autoclave or washing machine. The cover assembly  14  when cleaned may then be re-attached to the housing assembly  16 . Alternatively, a new or different cover assembly  14  and a new or different lever  19  may be applied. Coupling or removal of the cover assembly  14  from the housing assembly  16  is accomplished in a manner described with reference to  FIGS. 32 to 35  with the cover  18  and the lever  19  coupled together. After removal of the cover assembly  14  from the housing assembly  16 , the lever  19  can be removed from the cover  18  for separate washing and/or replacement. Separate washing of the cover  18  and lever  19  is advantageous to clean the surfaces where the axle keyhole openings  27  engage the axle  31 . 
     In the preferred embodiment, after removal of the cover assembly  14  from the housing assembly  16  as, for example, shown in  FIG. 34 , the tab  74  remains coupled to the housing assembly  16 . The tab  74 , however, is preferably releasably coupled in a friction-fit arrangement with the button guide member  242  so that the button  74  may independently be removed from the housing  70  for separate cleaning as in a washing machine. 
     In another preferred arrangement, the cover  18  may include a resilient button cover portion  333  shown in broken lines in  FIG. 32  which covers and encloses the button opening  247  yet permit a user&#39;s finger to deflect the resilient button cover portion downwardly sufficiently to operatively move the button  74 . Such a button cover portion  333  may, for example, comprise a resilient sheet of flexible silicone that over the button opening  247  sealably engages to the top wall  21 . 
     The preferred embodiments illustrate one particular arrangement for a pump mechanism and a bottle for the fluid dispensers. Various other pump arrangements and arrangements of pumps and bottles may be utilized. For example, the pump mechanism and bottle may be removed separately or the pump mechanism and bottle may be provided as an integral unit which is removed as a unit. The preferred embodiments illustrate the use of a piston pump which has similarities to the piston pump disclosed in U.S. Patent Publication US 2008/0121644 to Ophardt et al, published May 29, 2008. The pump mechanism, however, is not limited to the use of a piston pump mechanism and various other pump mechanisms may be provided which are activated by movement of the lever. 
     The dispenser  9  as shown in  FIG. 1  is secured to a stand  11 . The dispenser may be supported on any support structures such as, for example, may be coupled to a wall. 
     In the preferred embodiment, the axle keyway openings  27  are shown to extend through a rear edge of each of the side walls  22  and  23 . Insofar as the side walls may have a portion which extends rearwardly beyond the top wall, then it is possible for the axle keyway openings  27  to open upwardly through an upper edge of each of the side walls. 
     The manner of coupling the lever  19  to the side wall is illustrated in accordance with the present invention on a cover  18  that is generally open forwardly. The cover  18 , however, may be closed on its front face bridging between the side walls. Each axle keyway opening may be provided to extend to a bottom edge of each of the side walls or to a rear edge of each of the side walls at the lower rear edge of the side walls. Thus, the axle keyway openings may be provided through the cover side walls at a convenient location. The advantageous manner of mounting the lever  19  to the cover through the axle keyway openings  27  in the cover can be adapted, for example, to have a lever  19  proximate the lower end of the cover and operative to engage a pump mechanism, for example, disposed in a lower portion of the dispenser assembly. 
     The preferred embodiment illustrates a preferred arrangement for providing for vertical sliding of the cover  18  relative to the housing assembly with upwardly located right and left latch members engaged within slide grooves in the cover side walls. Alternate configurations for the latch members and the slide grooves may be provided which guide the cover in vertical sliding relative to the housing assembly. 
     The preferred embodiment illustrates the rod member as also providing for guided sliding of the cover relative to the housing assembly vertically as well as for pivoting about the rod member. Substitute structures may be provided in which the equivalent of the rod member is carried, for example, as stub axles on the housing side walls and slide grooves on the cover side wall. 
     In the preferred embodiments, the rod receiving groove and the housing side walls open through a bottom edge of the housing side walls. This is not necessary and it is to be appreciated that the rod retaining slots may open through the front edges of the housing side walls. 
     While the invention has been described with reference to preferred embodiments, many modifications and variations will now occur to persons skilled in the art. For a definition of the invention, reference is made to the accompanying drawings.