referring more particularly to the drawings , wherein like numbers refer to like parts , fig1 illustrates a preferred embodiment of the novel underwater flower cutter of the invention , shown generally at 10 . the underwater flower cutter 10 has a substantially rigid frame 12 . the frame 12 has an anvil end 14 and a piston end 16 . the frame 12 has a first end plate 18 having a selected height and width located at the anvil end 14 of the frame . a second end plate 20 generally similar to the first end plate in size and shape is oriented in opposed relation thereto and is located at the piston end 16 of the frame 12 . each end plate 18 , 20 has a foot portion 22 adapted to rest on the floor or other supportive surface of the water bath in which the underwater flower cutter 10 is being used and to thereby support the weight of the underwater flower cutter . the frame 12 further includes a lower support bar 24 having a selected length and extending between the first end plate 18 and the second end plate 20 . the lower support bar 24 is rigidly attached to each end plate 18 , 20 by any conventional means for attachment . in the preferred embodiment , the end plates 18 , 20 have holes ( not shown ) through which the lower support bar 24 extends . the ends of the lower support bar 24 are threaded , and nuts 26 are engaged with the threads and are tightened against the adjacent end plate 18 , 20 to attach the bar 24 thereto . two upper support bars 28 extend between the first and second end plates 18 , 20 at a selected distance above the lower support bar 24 . the upper support bars 28 generally correspond to each other in structure and are spaced horizontally from each other at a selected distance . the ends of each upper support bar 28 are attached to the first and second end plates 18 , 20 in a manner comparable to the mode of attachment of the lower support bar 24 . the frame 12 also includes a middle support plate 30 located at a selected point between the first and second end plates 18 , 20 . the middle support plate 30 extends at a right angle to the two upper support bars 28 and is rigidly attached thereto . preferably , the middle support plate 30 has holes ( not shown ) through which the upper support bars 28 pass . the two upper support bars 28 have threads that extend for a selected distance on either side of the middle support plate 30 . nuts 32 threadedly engaged with the threads are turned tightly against opposite sides of the middle support plate ( 30 ), firmly holding the middle support plate between them . an hydraulic cylinder assembly 34 extends between the second end plate 20 and the middle support plate 30 substantially parallel to the two upper support bars 28 . the hydraulic cylinder assembly 34 has a piston housing 36 , including a tubular portion 38 extending substantially parallel to the two support bars 28 , a first end cap 40 closing the end of the tubular portion 38 adjacent to the second end plate 20 in substantially sealed relation , and a second end cap 42 closing the end of the tubular portion 38 adjacent to the middle support plate 30 . a piston head 44 is contained within the tubular portion 38 and is adapted to move reciprocally therein between the first and second end caps 40 , 42 . a power shaft 48 is attached to the piston head 44 . the second end cap 42 and the middle support plate 30 have surfaces defining a shaft port 50 extending therethrough parallel to the tubular portion 38 . the power shaft 48 extends through the shaft port 50 toward the first end plate 18 for a selected distance . an annular shaft collar 52 surrounds the shaft 48 at a selected location and is tightly fastened thereto by means of a set screw 53 . the shaft collar 52 is so located on the shaft 48 that when the piston head 44 approaches the first end cap 40 , the shaft collar 52 comes to rest against the middle support plate 30 , as is illustrated in fig2 thus preventing contact between the piston head and the first end cap . a knife 54 is attached to the end of the shaft 48 that is remote from the piston head 44 . the knife 54 extends horizontally to overlap and rest upon upwardly facing surfaces of the two upper support bars 28 , which surfaces serve as knife guides 56 defining the lowermost level along which the knife can move . the knife 54 has a horizontally oriented cutting edge 55 that faces the first end plate 18 . an anvil 58 is attached to the first end plate 18 . the anvil 58 has holes ( not shown ) through which the two upper support bars 28 extend . the anvil 58 has an impact surface 60 adapted to engage the cutting edge 55 of the knife 54 when the knife has slid along the knife guides 56 for a selected distance . the location of the impact surface 60 determines the furthest possible extension of the knife 54 and attached shaft 48 and piston head 44 toward the anvil end 14 of the frame 12 . the anvil 58 also has upper and lower stem locator members 62 , 64 extending for a selected distance from the impact surface 60 toward the piston end 16 of the frame 12 . when the cutting edge 55 is in contact with the impact surface 60 , the upper stem locator members 62 extend above the knife 54 , and the lower stem locator members 64 extend beneath it . the lower stem locator members 64 are so located relative to the upper support bars 28 that the surfaces of the upper support bars 28 serving as knife guides 56 are unobstructed , as is best illustrated in fig3 . each upper and lower stem locator member 62 , 64 has a locator surface 66 extending laterally away from a selected point on the impact surface 60 toward the upper support bar 28 nearest thereto at an angle to the impact surface . the underwater flower cutter 10 includes means 68 for biasing the knife 54 toward the piston end 16 of the frame 12 . in the preferred embodiment , a stationary retractor post 70 is rigidly fastened to the middle support plate 30 midway between the two upper support bars 28 and extends downwardly for a selected distance . at least one and preferably two moving retractor posts 72 are attached to the knife 54 , extending downwardly therefrom at selected locations between the two upper support bars 28 . an elastomeric band 74 , such as a large conventional rubber band , is fastened to both moving retractor posts 72 and is passed around the side of the stationary retractor post 70 facing toward the piston end 16 of the frame 12 . the elastomeric band 74 has a length selected to be such that the band remains under moderate tension when the shaft collar 52 is in contact with the middle support plate 30 , thus biasing the knife 54 toward the piston end 16 of a frame 12 . furthermore , because the stationary and moving retractor posts 70 , 72 are located beneath the knife 54 , the elastomeric band 74 also tends to pull the knife downwardly , biasing it against knife guides 56 . while the elastomeric band 74 disclosed is the preferred biasing means 68 , expansion springs or other means for biasing the knife 54 toward the piston end 16 of the frame 12 are possible and within the scope and spirit of the invention . a water supply port 76 is located on the cylinder assembly 34 , preferably at the first end cap 40 , to admit water into the high pressure side of the piston housing 36 between the piston head 44 and the first end cap 40 to drive the piston head and attached power shaft 48 and knife 54 toward the anvil end 14 of the frame 12 , until the knife contacts the impact surface 60 of the anvil 58 . the second end cap 42 of the piston housing 36 has a water vent 78 extending therethrough to communicate between the interior of the low pressure side of the piston housing and the water in which the underwater flower cutter 10 is immersed . as the piston head 44 is moved toward and away from the anvil end 14 of the frame 12 , water leaves and enters the piston housing 36 through the water vent 78 , with water substantially filling that part of the piston housing located between the piston head 44 and the second end cap 42 . the size of the water vent 78 is selected to be such that water flow in and out of the piston housing 36 is restricted and the movement of the piston head 44 is thereby damped . a conventional three - way valve 80 is connected to a water supply line 82 that is connected to the water supply of the building in which the underwater flower cutter 10 is to be used . a feed line 84 communicates between the valve 80 and the water supply port 76 . an exhaust line 86 communicates between the valve 80 and a drain ( not shown ). the valve 80 has a plunger 88 adapted to be conveniently operated by the foot or knee of the user of the underwater flower cutter 10 , the plunger having an elevated position and a depressed position . the plunger 88 is biased towards the elevated position by a compression spring 90 . when the plunger is depressed , the valve 80 puts the water supply line 82 and the feed line 84 in communication , thereby pressurizing the feed line and the piston housing 36 , driving the piston head 44 and attached shaft 48 and knife 54 toward the anvil 58 until the cutting edge 55 rests against the impact surface 60 , as is shown in phantom in fig2 and 3 . when the plunger 88 is allowed to return to its elevated position , the valve 80 puts the feed line 84 in communication with the exhaust line 86 , whereupon the biasing means 68 pulls the knife 54 away from the anvil 58 and causes the water that had been introduced from the water supply line 82 to pass back through the feed line 84 and be exhausted through the exhaust line 86 . the movement of the piston head 44 and connected knife 54 to the anvil 58 and back in response to the application and release of water pressure by means of the manipulation of the valve 80 as disclosed shall hereinafter be referred to as a &# 34 ; cutting cycle .&# 34 ; a shield 92 is fastened to and extends between the first end plate 18 and the middle support plate 30 . the shield 92 extends across the anvil 58 and knife 54 and above them at a selected distance , so that the knife 54 may freely pass beneath the shield as it is put through a cutting cycle . the shield 92 is of a size selected to be sufficient to prevent the accidental introduction of the operator &# 39 ; s hand or finger between the anvil 58 and knife 54 . a flower stem guide 94 is attached to the shield 92 and extends therethrough . the flower stem guide 94 includes a broad , upwardly opening funnel 95 having an open bottom 97 with a selected diameter sufficiently large that a selected bundle of flower stems 96 may be inserted therethrough until the stems project between the knife 54 and anvil 58 adjacent to the impact surface 60 . the funnel shape of the flower stem guide 94 tends to direct the ends of the stems being introduced into the underwater flower cutter 10 to a proper position for cutting , as is illustrated by the bundle of flower stems 96 shown in fig2 . in use , the underwater flower cutter 10 of the invention is immersed in water contained in a tub , sink , or other selected receptacle . the water supply line 82 is connected to the water supply of the building in which the underwater flower cutter 10 is to be used , and the valve 80 is placed so as to be convenient for manipulation , preferably by the operator &# 39 ; s foot or knee . the operator then selects a bundle of flowers 96 to be cut under water for the reasons discussed above , inserting the end of the bundle through the flower stem guide 94 until the stems project between the knife 54 and anvil 58 . the plunger 88 of the valve 80 is then depressed by the operator . as the knife 54 is driven toward the anvil 58 by the piston head 44 and power shaft 48 , the stems are forced toward the stem locator surfaces 66 and the impact surface 60 , and are cut by the cutting edge 55 . after the knife 54 reaches the impact surface and the stems are all cut , the operator releases the plunger 88 and the knife 54 is returned to its starting position by the biasing means 68 , thus completing the cutting cycle . it will be appreciated that there can be no deleterious leakage of foriegn hydraulic fluid into the water under which the stems are being cut in that the propelling fluid is itself water . consequently , no gasket is needed to seal the piston head 44 to the inner surfaces of the tubular portion 38 of the piston housing 36 . the piston head 44 need only fit tightly enough to allow for a pressure differential before and behind the piston head sufficient to propel the knife 54 against the anvil 58 with enough force to cut the stems 96 . water leaking around the piston head 44 serves to lubricate the piston head , making grease or oil unnecessary , a feature that is beneficial in that oil or grease in the water bathing the stems 96 would foul the newly cut stem ends . it will also be appreciated that , even if the water in the tub or sink becomes cluttered by cut stem ends so that the operator &# 39 ; s view of the knife 54 and anvil 58 becomes obstructed , the operator may nevertheless reliably and safely locate the stems 96 in a proper position between the knife and anvil and also may roughly gauge how far beyond the knife the stems extend prior to cutting by estimating downwardly from the flower stem guide 94 , which may be allowed to protrude up to and even slightly above the surface of the water . while the embodiment of the biasing means 68 shown is preferred , other equivalent biasing means including , by way of example , mechanical spring means or hydraulic means , may be employed . typically , hydraulic means would be provided by a modified cylinder assembly of the conventional double acting type in which an additional water line is directed from a modified control valve to the other end of the cylinder , and the modified control valve alternately and oppositely connects the two lines to the water supply and the drain in a conventional manner to cause the piston to cycle between positions adjacent to the first end cap 40 and the second end cap 42 . in such an arrangement , the drain part of the control valve would be suitably restricted to control the speed of movement of the piston . as in the preferred embodiment , leakage of water from the double - acting cylinder assembly would not contaminate the water bath in which the unit is submerged . all rigid parts of the underwater flower cutter 10 of the invention may be conveniently made from appropriate metals ( preferably non - corrosive in water ) or plastics using conventional metal and plastic forming techniques . it is understood that the invention is not confined to the particular materials and embodiments herein illustrated and described but embraces all such modified forms thereof as come within the scope of the following claims .
an underwater flower cutter for cutting flower stems is disclosed which is adapted from operation while submersed beneath water . the underwater flower cutter includes a reciprocating hydraulically operated knife which is capable of cutting the stems of flowers and which is operable from outside of the water . flower stems can be inserted into the cutter and the hydraulic assembly operated from outside of the water to cleanly cut the stems of the flowers while they are submersed .