with reference now to the drawings , and in particular to fig1 - 3 thereof , a new viscous material dispenser embodying the principles and concepts of the present invention and generally designated by the reference numeral 10 will be described . more specifically , it will be noted that the viscous material dispenser 10 comprises a frame 12 that has a substantially hollow rectangular cross section and that is of the proper length to support a cylinder casing 14 disposed thereon . an arm rest 16 and a handle 18 are fixedly secured to the frame 12 to provide for respective support and manipulation of the device by an operator . the arm rest 16 is substantially arcuate in shape so as to partially encompass an operator &# 39 ; s forearm which provides for the stable support of the dispenser thereon . the handle 18 is formed in such a manner so as to define an aperture along its length to allow for an air hose 20 to pass therethrough . attached to the frame 12 is a cylinder support 22 which receives and supports the cylinder casing 14 . the cylinder casing 14 is a substantially hollow tubular member which includes a plurality of projections 23 that are operable to selectively engage a plurality of locking apertures 24 present in the cylinder support 22 , thereby to removably secure the cylinder casing to the cylinder support . an icing cylinder 26 containing icing to be dispensed may be coupled to a nozzle assembly 28 and inserted within the cylinder casing 14 . when placed within the cylinder casing 14 , the nozzle assembly 28 rests against a flange 30 present on the cylinder casing which precludes axial movement of the nozzle assembly out of the cylinder casing during operation . the icing cylinder 26 includes a plunger 32 that may be biased axially down through the icing cylinder to expel the icing to be dispensed through the nozzle assembly 28 coupled thereto . to provide for movement of the plunger 32 through the icing cylinder 26 , air is releasably injected into the icing cylinder . a seal 34 is secured to the cylinder support 22 by a seal retainer 36 and a fastener 38 . the seal 34 is biased towards the icing cylinder 26 by a seal spring 40 . a swivel 42 is connected to a valve 44 by a swivel screw 46 and is allowed to sealably rotate about the swivel screw by a plurality of sealing washers 48 . the air hose 20 is connected to the swivel 42 by conventional clamping means so that pressurized air from an air source may flow through the swivel and into the valve 44 . the valve may be selectively operated to allow the passage of air through apertures 49 in the seal 34 to inject air into the icing cylinder 26 which will biasedly move the plunger 32 axially down the icing cylinder . the valve 44 contains valve operational components 50 that are shown for illustrative purposes and serve only to represent one of the many possible operational valve component assemblies known in the art which is operable to provide regulated passage of pressurized air through the valve during actuation and venting of the air thereafter . the valve 44 is operated by a trigger 52 that is disposed within the frame 12 . the trigger 52 is pivotably secured to the frame 12 by a pin ( not shown ) that passes both through an aperture 54 in the frame and an aperture 56 in the trigger . the trigger 52 operates the valve 44 by pivoting upon the pin which allows the trigger to engage the valve , thereby causing actuation of the valve . the trigger 52 is biased by a spring 58 so that upon release of the trigger , the valve 44 will cease to allow the passage of air therethrough . in addition , the valve 44 will vent air disposed within the icing cylinder 26 to the atmosphere , to thereby immediately terminate the dispensing of icing upon release of the trigger 52 . with reference now to fig4 - 9 , the nozzle assembly 28 comprises a nozzle mount 60 that is substantially round and sized to fit within an end of the icing cylinder 26 to engage the flange 30 present on the cylinder casing 14 . the nozzle mount 60 includes an o - ring seal 62 that is operable to prevent the passage of icing therepast . the nozzle mount 60 further includes a central aperture 63 to allow the passage of icing therethrough . a nozzle 64 may be coupled to the nozzle mount 60 by the use of a tubular fastener 66 which may be threadably engaged to threads 68 on the nozzle mount . a variety of nozzle diameters , shapes , lengths , patterns , or designs may be interchangeably attached to the nozzle mount with foregoing structure so as to facilitate a rapid changing of dispensing patterns . a first nozzle 70 may be used to provide for the dispensing of a narrow and substantially circular bead of icing . a second nozzle 72 may be engaged to the nozzle mount 60 to allow the dispenser to produce a thicker bead of icing . further , a third nozzle 74 may be utilized to produce a thick bead of icing with an outer surface having a uniform pattern of increasing and decreasing radii therearound . a fourth nozzle 75 may be seen in fig8 - 9 and comprises an angled extension 76 and a further tubular fastener 78 for attaching any one of the aforementioned nozzles to the angled extension . as to the manner of usage and operation of the present invention , the same should be apparent from the above description . accordingly , no further discussion relating to the manner of usage and operation will be provided . with respect to the above description then , it is to be realized that the optimum dimensional relationships for the parts of the invention , to include variations in size , materials , shape , form , function and manner of operation , assembly and use , are deemed readily apparent and obvious to one skilled in the art , and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention . therefore , the foregoing is considered as illustrative only of the principles of the invention . further , since numerous modifications and changes will readily occur to those skilled in the art , it is not desired to limit the invention to the exact construction and operation shown and described , and accordingly , all suitable modifications and equivalents may be resorted to , falling within the scope of the invention .
a viscous material dispenser employing pneumatic air power for dispensing cake icing onto a cake . the dispenser utilizes interchangeable cylindrical cake icing cartridges which facilitate easy changing of the icing type or color without significant cleaning of the device . the dispenser rests upon the forearm of a user and is manipulated by a handle placed near the dispensing tip to allow for steady movement of the dispenser by the user .