Abstract:
A discharge apparatus for media comprises two functional units, each including a medium reservoir, a discharge unit operatively connected to the medium reservoir, and a depressible discharge actuator operatively connected to the discharge unit. A mechanism is further provided for simultaneously depressing the discharge actuators. At least one of the functional units is movable with its associated discharge actuator over part of the depression of the discharge actuator, so that the media are not discharged from the medium reservoirs during movement of the functional units.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a discharge apparatus with which at least one flowable medium can be manually discharged. The flowable medium can have a random aggregate state, but is preferably a pasty, liquid and/or pulverulent material. Such discharge apparatuses appropriately have at least one medium reservoir and at least one discharge unit, which can be formed by a manually driveable pump, an aerosol valve, etc. there is also a discharge actuator, which is mainly formed by a pushbutton and which is actuated over an actuation stroke, whereof at least part of the actuation stroke can simultaneously comprise a discharge stroke by means of which the medium is discharged from the discharge apparatus. 
     2. Description of the Prior Art 
     For numerous reasons in the case of discharge apparatuses of this type, there can be a need over part of the actuation stroke for discharge not to take place or only to take place at a delivery speed, which is much lower than the maximum delivery speed. If, e.g, two discharge units are simultaneously operated by means of a common discharge actuator, it can be appropriate to modify and/or start the discharge strokes of the two discharge units in a slaggered manner. If this is brought about by delaying the pressure buildup in the pressure chamber by using discharge pumps as the discharge units, a very complicated and not very reliable device results. An at least partial separation of the discharge stroke from the actuating strokes can also be advantageous for other reasons, for example to prevent unauthorized use of the device by allowing, an actuation, but not a discharge of the apparatus in a predetermined functional position. 
     The problem addressed by the invention is to provide a discharge apparatus of the aforementioned type, which avoids the disadvantages of known constructions. In particular, it must be possible in a simple manner to separate the discharge stroke from at least part of the actuating stroke, without any special requirements having to be made on the working characteristics of the discharge unit. 
     SUMMARY OF THE INVENTION 
     According to the invention this problem is solved by providing at least one medium reservoir, at least one discharge unit and/or a similar functional unit, substantially as an entity with the discharge actuator, which is movable in such a way over a retarding stroke, that the device is either not discharged or is only discharged with a reduced delivery per stroke unit. 
     If, e.g. in accordance with DE-OS 36 14 515, to which reference should be made for further details, advantages and effects, two separate discharge units are operated by means of a common handle, despite roughly the same delivery volumes, the effective delivery volume of one medium reservoir can be reduced at random compared with that of the other reservoir. There can also be time staggering of the start of the discharge from one medium reservoir compared with that of the other, or the delivery valves of the two discharge units can be adjusted in such a way that although the start of the discharge takes place roughly simultaneously, the medium in one discharge unit is much more strongly precompressed and therefore passes out at a higher pressure than from the other discharge unit. If the retarding stroke is to be engaged or disengaged, or its start and/or finish and therefore optionally its length are to be modified, then this construction can also be used to prevent unauthorized discharge or for modifying a dosed discharge quantity, the discharge apparatus possibly having only one medium reservoir and/or one discharge unit. 
     Instead of moving the discharge unit, e.g. a pump casing, with respect to the medium reservoir over the entire retarding or idle stroke or part thereof, the arrangement is preferably such that the medium reservoir is synchronously also movable with respect to a body with the discharge actuation, so that there is no relative movement between the discharge unit components to be moved for the discharge, but the basic body of the discharge unit can be rigidly connected with the medium reservoir. 
     In order to bring about the retarding stroke, the operating handle can be moved relative to an operating member of the discharge unit, e.g. an operating plunger, over an empty or idle stroke, but in order to obtain easy sealing effects, it is advantageous for the movable functional part to be connected to the operating handle independently or separately from the connection through the operating member via a driver or the like. Connection preferably takes place in such a way that the functional part, initially substantially without actuation, is synchronously moved along or in a decelerated manner, optionally accompanied by reduced actuation, so that the discharge unit is actuated synchronously over the remainder of the actuating stroke. The driver appropriately gives way elastically in that its effective length is reduced. 
     The inventive construction is also suitable for such support apparatuses or discharge units with which only a single, substantially complete emptying of the medium reservoir takes place and therefore no return stroke or travel is necessary. However, it is particularly suitable for discharge units which, substantially for each return stroke, suck from the medium reservoir a predetermined medium quantity into a pressure or pump chamber and then yield it again during the next actuating stroke. Such discharge units can be thrust piston pumps which, in the interior of a cylinder casing, receive in a completely encapsulated manner a return spring acting on the pump piston. This return spring is also suitable, following each actuating stroke, to so return the discharge apparatus to its discharge position such that no separate return spring is required. This return operation then includes the return of the movable functional unit by the retarding stroke. In place of a separate driver, appropriately the aforementioned driver is used, which in the manner of a snap connection engages behind a ring shoulder of the functional unit, said ring shoulder being formable by a ring flange at the end of a vessel neck of the medium reservoir. Thus, it is possible in a simple manner, to connect the functional part during installation via a plug or snap connection to the actuating handle. 
     If the discharge unit is not or not solely movable with respect to the medium reservoir and instead the latter is movable over at least part of the retarding stroke, a separate body is provided for its mounting and is appropriately constructed as a casing receiving one or all the medium reservoirs in a substantially completely encapsulated manner and with respect to which the actuating handle is displaceable by the actuating stroke. For the mounting of the movable functional part, said outer casing can have a substantially one-piece inner casing therewith, e.g., a bearing shaft projecting inwards in a contact-free manner from one end wall, whose bottom wall remote from the end wall forms the stop for the movable functional unit. An easy installation is obtained if the movable functional part or at least a closed subassembly formed by the medium reservoir and the discharge unit is inserted from the side of said end wall in the casing, whereas at least one corresponding, but non-movable subassembly is inserted from the other end of the casing and is preferably secured in the vicinity of the inside of said end wall by means of a snap connection. Following insertion, the other, initially open end of the casing can then be closed with a cover, cap, etc. Following the insertion of the subassemblies the cap-like actuating handle can be engaged by plug or snap connections and can be simultaneously connected with the actuating members of all the discharge units projecting over the end wall. 
     These and other features of the invention will be understood from the claims, description and drawings. The invention is described in greater detail hereinafter relative to a preferred embodiment illustrated in the attached drawings, wherein: 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows the invention discharge apparatus in a part sectional view. 
     FIG. 2 illustrates the discharge apparatus of FIG. 1 in a part sectional side view. 
     FIG. 3 shows the discharge apparatus of FIG. 2 in a part sectional plan view. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The discharge apparatus 1 according to FIGS. 1 to 3 has two discharge groups 2,3, which can also discharge separately. The discharge groups substantially comprise a discharge unit 4,5 with an actuator 6,7 and a medium reservoir 8,9. At least one discharge unit 4 or 5 is formed by a thrust piston pump 4a, whose casing is connected in a sealed and positionally fixed manner to the associated medium reservoir 8 or 9 and is located roughly in its center axis. 
     The two discharge groups 2,3 are arranged on a thin-walled body 10 in a directly adjacent, but substantially contact-free and parallel juxtaposed manner, said body forming in one piece an outer casing 11 and an inner casing 12. The outer casing 11 forming an outer face of the discharge apparatus 1 is closed at its bottom-side end by a cap-like closure 13, whose jacket has the same cross-sectional shape as the jacket 14 of the casing 11. Closure 13 is connected to said jacket 14 by ring webs engaging over the same. Facing the closure 13 of the jacket 14 has an end boundary in the form of an end wall 15 constructed in one piece therewith. The jacket 16 of the casing 12 is connected in one piece to the inside of said end wall 15 in such a way that it is spaced from the inside of the jacket 14 and only extends over a part to its inside length. The inner end of the jacket 16 is spaced from the bottom of the closure 13 and is tightly closed in one piece with a bottom 17. 
     On the thrust plunger or actuator 6,7 of the discharge unit 4,5 located outside the casing 11 is fixed, adjacent to the outside of the end wall 15, a separate discharge or actuating cap 18,19 formed by plugging on an inwardly located neck, which is surrounded by a much wider cap jacket. Thus, each discharge group 2 or 3 can be manually operated for discharge purposes if removed from the body 10. On the caps 18,19 a common actuating handle 20 mounted, which for each cap 18 or 19 has a socket projecting only over the inside of its end wall and whose cap jacket has substantially the same cross-sectional shape as the jacket 14 or the jacket of the closure 13. The inside diameter of the casing 11 is relatively closely adapted to the outside diameter of the cross-sectionally wider medium reservoir 8, so that the latter is supported and centered on a semicircular arc directly facing the inside of the jacket 14. Adjacent to the roughly equally wide, semicircular cross-sectional arc of the cross-sectionally flat oval jacket 14 the cross-sectionally narrower medium reservoir 9 is provided which, unlike the medium reservoir 8, is not located in the center axis of the associated cross-sectional ar. 
     At least one medium reservoir 8 or 9 is made from a transparent or translucent material and has a substantially cylindrical vessel body 21 or 22, which at its end passes via an offset ring shoulder into a narrowed vessel neck 23 or 24 and at the other end is open to the full inside diameter. On the end of the vessel neck 23 or 24, a slightly outwardly widened neck flange 25 or 26 is provided, on which the casing of the particular discharge unit 4 and 5 is fixed with a crimp ring 27,28, etc., in such a way that accompanied by the interposing of a seal it engages with a ring flange and under tension on the end face of the vessel neck 23 or 24. The discharge group 2, which is fixed with respect to the body 10, traverses part of the length of the casing of its discharge unit 4 through a closely adapted opening in the end wall 15 is positionally secured with respect to the body 10 by a snap connection 29 located on the inside of end wall 15. Prior to the fitting of the closure 13, discharge group 2 is inserted through the end of the body 10 until it strikes the ring flange or the crimp ring 27 of the discharge unit 4 on the inside of the end wall 15, accompanied by an engagement of the snap connection 29. Snap connection 29 be formed, for example, by ribs radially distributed over the circumference of the snap ring such that the offset snap shoulders engage behind the crimp ring 27 in the vicinity of the transition shoulder of the neck flange 25. The lower end of the medium reservoir 8 extends down to the inside of the bottom of the closure 13, so that the medium between bottom 13 and the end wall 15. Thus, the bottom of closure 13 forms a closure of the open end of the vessel body 21. The other discharge group 3 is displaceable with the respect to the body 10 by depression of the actuation handle 20. Displacement of discharge group 2 is effected over a first portion of the downward movement of actuating handle 20, starting from its initial position. For this purpose the jacket 16 of the casing 12 forms a linear sliding mounting support for the vessel body 22 of the medium reservoir 9. The discharge group 3 is connected to the actuating handle 20 in a substantially interlocking manner in both opposite movement directions by means of a driver 30. This driver 30 can comprise a singly or multiply longitudinally slotted sleeve, which in the longitudinal direction projects over the associated socket and is connected by means of a snap connection 31 to the medium reservoir 9. The end face of the sleeve engages on the ring shoulder 32 between the vessel body 22 and the vessel neck 24 and forms in cross-section spring arms 33 curved around the center axis of the driving connection. Each spring arm has a snap-action cam 31 projecting over the inside and which engages behind the neck flange 26 or the crimp ring 28 in the manner described relative to the snap connection 29. This discharge group 3 an be prefitted with the actuating handle 20 and then inserted from the side of the end wall 15 into the casing 12 open to its full inside diameter in the vicinity of the end wall 15 until the actuating handle 20 engages with the actuator or with the cap 18. The open end of the vessel body 22 is then located at a smaller distance from the bottom 17 compared with the overall stroke length of the actuating handle 20. Thus, the bottom 17 of inner casing 12 forms a stop 35 for the end of downward displacement of discharge group. In its starting position, the vessel neck 24 can project over the outside of the end wall 15. By withdrawing the actuating handle 20 from the casing 11 the medium reservoir 9 or the discharge group 3 can be removed and replaced by a new unit at any time. 
     In the vicinity of its end opposite to the discharge unit 4 or 5, the reservoir chamber of the medium reservoir 8 or 9 is bounded by a drag piston 36 or 37 which, under the vacuum occurring on sucking the medium, is moved automatically along the associated vessel body 21, 22, while maintaining a seal. At the base of each piston a filling opening for the reservoir chamber is provided which is closable by means of a cover. The suction opening 38 or 39 of the discharge unit 4 or 5 faces in a spaced manner the drag piston 36 or 37. The suction opening 38 or 39 is formed by the casing end of the associated discharge unit 4 or 5 and leads into a pump chamber, e.g., accompanied by the interposing of an intake valve. 
     For discharge purposes, the actuating handle 20 is pressed down by finger pressure on the outside of its end wall opposite the casing 11. The discharge unit 4 is then operated immediately over the entire actuating stroke until the medium located in the pump chamber is discharged. However, over a first partial stroke, the discharge group 3 is moved along synchronously with the actuating handle 20, so that initially the discharge unit 5 is not actuated. Only when the end of the medium reservoir 9 engages with the stop 35, is there an actuation of the discharge unit 5 over the remaining actuating stroke of the handle 20, namely a relative movement of the handle 20 or the actuator 7 with respect to the casing of the discharge unit 5. A corresponding moving pump piston is connected to the actuator 7. At the end of the actuating stroke the actuating handle 20 is released, so that the return springs 46 in the casings of the discharge units 4,5 return the latter to their starting position, whilst the return spring of the discharge unit 4 also resets the discharge group to its starting position with respect to the body 10. 
     As soon as the discharge group 3 has struck against the stop 35, the spring arms 33 undergo a shortening of their effective length accompanied by a bulging deformation. Although the snap-action cams 34 can rise or be disengaged from their snap position, on releasing the actuating handle 20 they immediately return to the secured position, so that on reaching the starting position of the discharge unit 5 they can serve as a return stroke driver for the discharge group 3. To this extent the spring arms 33 also form a return spring for the discharge units 4,5. 
     In the vicinity of at least one and in particular the medium reservoir 8, the jacket 14 of the casing 11 appropriately has an inspection window, e.g. in the form of a longitudinal slot and through which it is possible to see the filling state or the position of the drag piston 36 which serves as an indicator. Above the inspection window 40 the jacket 14 forms a slightly less wide portion 41, whose width is reduced by the wall thickness of the cap jacket of the actuating handle 20 and whose length is slightly greater than the length of the actuating stroke, so that in this position the handle 20 engages over position 41 and non dirt can enter the cavity within the handle 20. 
     Cap 18 or 19 forms a discharge head with a roughly radially freely outwardly projecting, tubular discharge connection 42 or 43, which is inserted in the cap 18 or 19. In plan view, the two discharge connections 42,43 are at an acute angle to one another and form with their free ends two directly adjacent discharge openings 44,45, which lead into the open and whose center axes intersect one another outside the discharge connections 42,43. The discharge connections 42,43 pass through the cap jacket of the actuating handle 20, which forms a cover 46 projecting over its outer circumference protecting the projecting ends of the connections 42,43. The cap 18 or 19 can also form a preassembled subassembly with the actuating handle 20. By replacing the cap, it is easy to change to differently dimensioned discharge connections.