Squirting gun and dosing device therefor

Description

For Office Useחוק הפטנטים׳ תשכ״ז - 1967PATENTS LAW, 5727-1967Application For PatentVני, (שם המבקש, מענו ולגבי גוף מאוגד - מקום התאגדותו)            £ ׳>•I (Name and address of applicant, and in case of body corporate-place of incorporatioCIBA-GEIGY A.G., of 141 Klybeckstrasse, Basle, Switzerland5 . .02296 cmo n invention the title of which isיי-                         "             י .וOwner, by virtue(Hebrew(Etiglisreby apply׳for a patent to be,grantod to mb in respect thereof.pplication of Divisionfrom ApplicationApplication for Patent AdditionI לבקשה / לפטנט •I. to Patehji / Appl.4............... / 'dated / מיום^.;׳..׳Nurfiber / Markted14929 / 68:er-Priority Claim' Date1.10.68Convention CountrySwitzerlandהוגש ב^ז......... / .....4 / .........Address for Service in, Israel\ןי עורני פ־טנטים........'7'31323"'4?''6'^.....................................1.................a............................iled in case....0.: the ApplicantsSignature of / j^pplicantPARTNERS1969 n,w October 5thof the year              of                 ThFor Office Usefrom, impressed with the Seal of the Patent Office and indicating the number and date of filing, certifies the filing of th lication the particulars of which are set our above.Delet whatevet is inapplicahSquirting gunCIBA-GEIGY AG..C.51523The .invention concerns a squirting or drenching gun which comprises a dosage-regulating device The gun is useful in particular for the oral or rectal administration of dosages of a liquid, e.g. of a medicinal solution or suspension, or in the rearing of animals, for the administration of dosed quantities of liquids containing fortifying concentrates, vitamins arid other similar agents in the form of solutions, suspensions or pastes.Drenching guns are already known which have a relatively complicated construction and wherein adjustment of any dosing means provided is very troublesome for the use of such drenching guns by untrained personnel in the field, e.g. in a pasture. However, when a certain medicament or other product is to be administered on one or several days to many dozen or even several hundred head of cattle by one or several persons, and the dose must be varied according to the kind or size of animal, the construction of the gun and the setting of the dosage should be as simple as possible. Such a gun should also require as few repairs as possible,, since repair shops are often few in number and / or a great distance away.According to the present invention there is provided a squirting or drenching gun having a dosage-regulating device for the administration of liquid in determined doses, which gun comprises a gun casing, a pistonfor sucking liquid doses into, and expelling liquid doses from a chamber in the said gun casing, the piston being mounted on a hollow piston rod which projects from the rearward end of the gun casing and is connected outside the gun casing to a liquid supply line, a mouthpiece equipped with a discharge valve and a trigger lever arranged such that the expelling stroke of the piston is effected by manual operation of the said trigger lever while the sucking stroke of the piston is effected by means of a spring member acting upon the trigger lever and via the said lever upon the piston rod and upon the piston, and wherein the dosage-regulating device comprises means which limit the stroke of the piston to a length corresponding to a determined liquid volume, said stroke-limiting means being located rearward of said chamber and being adapted to engage at least one stop means connected to said piston rod, and wherein the stroke-limiting means comprises a stopping disc serving as or bearing an arresting member and being adjustable solely by turning of a setting knob provided on the outside of the gun casing, the stopping disc being arranged at the inner sidewall of the gun casing at about the level of the piston rod in the region between the rearward wall of the gun casing enclosing the piston rod, and the rearward end of the chamber,,The setting know for the dosage-regularing device is preferably located on the right or left side at the side wall of the gun casing and at such a level above the trigger lever of the gun that it can be operated,, if desired, with one finger of the same hand in which the gun 16 being held by the person operating it, so that the other hand is free to hold th® animal being treated,.On construction of the cam disc, providing several abutting surfaces on the edge thereof and providing, as desired, two, three or more notches for the control knob of the dosage-regulating device, permits, with a little practice, a rapid operation of the latter device by the operator.This method of adjusting the desired dosage is especially advantageous because it can be performed by a simple manipulation, while the gun is introduced orally or rectally to one animal to be treated after another in rapid succession, Animals which are to be treated with this gun are primarily small mammals such as pigs, sheep, goats, vicunas, but also calves. Valves for the chamber to be charged with liquid are preferably rubber slot valves, which function in any random position.This construction according to the invention is distinguished by extraordinary simplicity both in the design of all the individual parts as well as their assembly and interchangeability. The individual parts can be made of metal? preferably, however, they are of plastics material,<cA main advantage of the gun according to the invention resides in the especially simple and*a.easily interchangeable arrangement of pai'ts of its dosage regulating device, hereinafter also referred to as dosing device.In contrast to the known guns, in which the dosage-regulating device is set by adjusting a screw spindle or the like, the dosage-regulating device of the gun according to the invention can be actuated by turning the setting know to the appropriate angle for the desired volume of liquid to be administered. By this rotation, the position of the stopping means, e.g. the above-mentioned cam disk, is so changed that the movement of the piston forming the terminal wall of the gun chamber to be filled with the desired amount of drench and coupled with the trigger lever is arrested, (either when moved backward by the pressure of the spring or, preferably, when moved forward by actuation of the trigger lever), at the specifically desired distance from the afore-mentioned discharge valve located in the mouthpiece of the gun, in a position whlqh determines in turn the volume of the liquid to be suctioned in or to be expelled, as the case may be.The invention is illustrated in the drawings by several non-liniitative embodiments thereof .Figure 1 shows a first embodiment of a gun according to the invention in a side view from the rightFigure 2 shows the same gun after removal of the righthand wall of the casing and the trigger lever, the interior parts being shown partly in side view, and partly in longitudinal section;Figure 3 shows a longitudinal section inthe plane III-III perpendicular to the plane ofFigure 2 through the upper part of the gun;Figure 4 shows a cross section throughFigure 3 along the plane IV-IV;Figure 5 represents schematically the interior of the upper part of this embodiment of the gun according to the'"invention, showing, however, two of the various positions of 'the trigger lever different from that shown in Figure 2;,. «A4-&e, Figures 6 (a), (b) and •(c) illustrate various 'constructions of the cam disk belonging to the dosing device in the embodiment shown in the preceding figures;!       Figure 7 shows in side view another, preferred embodimen;of the gun according to the invention, as well as a preferred '.embodiment of the dosing device therefor;;       Figure 8 shows a longitudinal section of the embodiment shown in Figure 7 with the piston and trigger lever in the !intake end-position; a discharge position corresponding to• the position "10" which is explained further below is indicated :by phantom lines;:        Figures 9 (a), (b) and (c) show the same section asFigure 8, but with piston, piston rod and dosing device in thre other discharge end-positions corresponding to the positions "5", "15" and "25" explained further below; the piston and ׳piston rod as well as a few other parts are shown unsectioned;Figure 10 shows a longitudinal section in the planeX - X vertical to the plane of Figure 9a through the 'rear upper 'part of the gun casing, the piston rod and a contact ring being shown unsectioned; and’       Figure 11 shows a cross section of Figure 9a along theplane XI - XI, looking into the back end of the gun casing.'       More in particular, the gun, according to the inventionshown in the drawings consists of the casing 1 and grip handle 2 preferably .integral with each.other, produced e.g. from cast synthetic resin. :..The discharge tube 4, in particular־In the embodiment .shown in Figures 1 to 5, is inserted in the front opening 3 of the casing by means of its frusto-conically$ shaped connecting piece 5, and detachably joined with the: casing by a slide lock constituted by the recess 6 •in thecasing wall 7 and the pin 8 on the outer wall 9 of the connect-• ing piece 5 extending into the casing wall 1••      As can be seen especially in Figure 2, in the rear end10 . . of the casing 1 opposite to the opening 3, an opening 10 is, provided, throughwhich passes a reciprocatingly movable tubular !piston rod 11 which bears at its front end flange 12, on which• the piston 13 and piston packing 14 are mounted in such a marine ־. that they can hermetically sealingly slide in the cylinder 915 ; provided in the connecting piece 5.      The chamber 15 formed in the interior of the cylinder 9 and closed off at. the back by the piston 13 can be emptied by way of a check valve 16 built into the connecting piece 5•where it merges into discharge tube 4. The chamber is filled 20 with liquid by way of a check valve 17 built into the open׳ end of the piston rod bearing the piston 13.These valves are .so adjusted that by the forward motionof the piston 13 towards the discharge tube 4, the valve 16 opens and the valve 17 is closed, while by the backward25 motion of the piston 13 away from the discharge tube 4, the; valve 16 is closed while the valve 17 opens. In this way,' during the backward stroke of the piston 13, liquid is drawn through a conduit hose 18 or the like from a storage chamber (not shown) which empties into the piston tube 11 and is sealingly fitted onto the externally ribbed end 19 of the׳ latter in known manner, the liquid being drawn through the opened valve 17 into the chamber 15; while, during the forward; stroke of the piston 13, with valve 17 being closed, all of; the liquid which has been drawn into the chamber 15 is! discharged through the opening valve 16 and the tube 4, e.g.' into the throat of an animal to be.treated (piston positionand trigger lever position A in Figure 5).׳ The liquid-discharging forward movement of the piston13 is effected by pulling the trigger lever 20 which is' mounted in the grip handle 2 on a pivot 22 detachably fastenedin the grip handle wall e.g. by a holding screw 21.   In' Figures 1 and 2, due to the pressure of the flat spring 26,the׳trigger lever 20 which extends with its upper part bearing the two bi-furcated arms 23, 24 into the casing 1, is in the' rear end-position, in which the arm 23 rests with a nose 37 (Figure 3) against the cam disk 25 set at the smallest radius a. The direction of the pressure of the flat spring is indi-: cated by the arrow designated by F in Figure 3.The arms 23, 24 of the trigger lever 20 grip the recesses27, 28 between each of the two pairs of longitudinal ridges29, 30 and 29', 30', respectively, mounted on opposite sidesof the outer wall of the piston tube 11, and arrest the pistontube 11 in this manner, and together with it, the piston 13, in the backward end position inside the cylinder 9 of theconnecting piece 5. In this position, shown in Figure 2, the chamber 15 contains the largest volume of liquid that: it can hold.;     . If the trigger lever 20 is then pulled back by hand into' the interior of the grip handle 2, the spring 26 is tensioned' and the upper ;part of the trigger lever, rotating around the1 pivot 22, moves forward with its arms 23, 24 and thus pushes׳ against the longitudinal ridges 30, 30’ of piston rod A and moves piston 13 within the cylinder 9 towards the front end; position A (Figure 5), which is reached when the rear edge 31 of the trigger lever hits the inner wall of the grip handle 2.i:      In this manner the content of the chamber 15 is emptied; through the'valve 16 and the mouthpiece of discharge tube 4.      In Figure 5, there are shown the trigger lever, piston' rod and piston, firstly in an intermediate position with the chamber half filled, and, secondly, in phantom lines, in emptying position. If, e.g. .only a half dose is to be; administered instead of a full charge, then the trigger lever20 must be stopped in its backward movement, under•. ;the influence of the spring 26, in the intermediate position M . shown in Figure 5. This is accomplished by accordinglyadjusting the dosing device 32 consisting of the cam disk 25, of the setting knob 34.catching on e.g. a four-edged recess 33; and of the releasable bolt and nut joint 36. Notches 35:                             -10.-                        .facilitate trie adjustment of the setting knob 34 to correspond to fixed preferred doses.i:      The dosing device is rotated by means of the knob 34, for instance, so as to apply'the smallest dose until the cam d 5 ' 25, fastened eccentrically on the knob, is pointed with its' largest radius b (Figures 3 and 5) toward the piston..In this manner the nose 37 of the trigger lever arm 23 abuts• against the edge of the cam disk 25 in the above-mentioned intermediate position M before reaching the end position shown 10 in Figure 2. By setting the cam disk 25 at any position betw: its largest and smallest radius, a׳$ the trigger lever arm 23 and thus also the piston 13 can be stopped at any intermediate: position desired, which, with appropriate outlay of the piston and chamber, may correspond to a desired volume of liquid15 between the half and the total volume.i! An especially exact, secure setting of two, three or more fixed volumes, without fine intermediary adjustment, is easily attained e.g. by correspondingly providing flat segments on the outer edge of the cam disk, as is shown in Figures 6 (b) 20 and (c).In Figure 6(a), the cam. disk has no flat segments. Itis therefore possible to attain any volume desired between the largest capacity, obtained ..by setting the smallest radius a of the cam disk, and the smallest capacity, obtained by25 setting the largest radius b of the cam disk. On the other hand, in Figure 6 (b), a preferred embodi-ment of the cam disk 25 is shown, in which the edge thereof has two flat segments 40 and 41 corresponding to the shortest radius a and the longest radius b, against which the contact־ 11 -וי- .                                                                                                                                                                                                                י י י; nose 37 of the trigger arm 23 can rest securely in its positioA variation.of the dosage due to slight rotation of the camdisk 25 is thus avoided, even without the use of notches 35.i Figure 6 (c) shows a similar cam disk 25 on which, besidesthe two flat-edged segments 40 and 41 for the radii a and b,: a third one, 42, .is provided for a position having an inter- mediary radius c lying between a and b. In the same manner,! more, settings of the dosing device can be provided, but it isi. recommended for the sake of simple operation to be content’ with two, three or four.' A particularly preferred embodiment of the cam disk serv-; ing as stopping means is shown in the Figures 8 to 11.In this embodiment the discharge tube 4 is joined by mean ' of a coupling nut 106 with a frustoconical insert 109, prefer-tably made of a transparent material, e.g. a transparent plasti׳ resin such as Plexiglas, which bears an outside screw thread; on the connecting portion 104 of discharge tube 4.Like parts of this and the first described embodimentare designated by the same reference numerals. They have: the same functions in both embodiments.In this preferred embodiment, the grip handle 102 which; is preferably integral with the casing 1, is open towards•• the rear׳ end of the casing; the trigger lever 120 is mountedtherein rotatably on the pivot 122• The flat spring 126presses the trigger lever 120 into the rearward end-position-in casing ], shown in full outline in Figure 8. In this position the bifurcated arms 123, 124 extending from the upper: end of the trigger lever, one of each engaging respectively,between the two longitudinal ridges 129, 130 and 129', 130'of the piston rod 11, hold the piston 13 in its farthest rear-- 12 -       .־ ..........-' ward position in the cylinder chamber 15. In this position,: a stop ring 137 rigidly mounted on the piston rod 11, or. being integral therewith, in the form of a flange, is not: contacting the stopping disk 125 serving as stopping means.1 This stop ring 137 has a flat edge on the side facing the. stopping disk 125, said flat edge having a recess 139 fTorn' tehe a-xia 0 P- rer I a L1 uit of—the stepping-dick 12^*.' As can be seen in Figures 8 to 11, the stopping disk 125: is of circular shape and is provided with a central hollow shaft 133 on the surface of the disk facing the casing wall.; The stopping disk is firmly joined, by means of a holding sere: 136 extending through shaft 133, with the setting knob 134,; which is mounted on the outer wall of the casing, so that: setting knob and stopping disk are held together and thus •rotate in unison on the outside and the inside, respectively.j of the casing wall. By means of notches 135 or the like, the: setting knob is held in a random number of positions. The setting knob can be caught in the notches 135, e.g. •by means; •of . a small ball 147 and spring 148 provided in a recess 146of the setting knob. In the embodiment shown in Figures'7 ׳ to 11, as can be seen from Figure 7, four different notches. are provided which correspond to four different discharge volumes, which are denoted on the setting knob 134 as "5", "10", "15" and "25".The discharge of the dose desired is effected as follows: On the side of the stopping disk 125 facing the piston rod 13. there is an arresting strip 143 eccentrically mounted along: a chord of the' circular disk surface. The arresting strip 14-13-._  : is spaced far enough from the axis of the stopping disk 125: and projects far enough out of the circular surface of the stopping disk 125 facing the stop ring 137 so as to contactJ: the opposite flat surface of the stop ring 137, when the5 arresting strip is in a position below and parallel to the longitudinal axis of the piston rod 11, as shown in Figure 10,; whereas, when the setting knob 134 and the stopping disk 125 are rotated 180° so that the arresting strip 143 is in the position indicated in Figure 10 by 143A, above and parallelIQ to the piston rod axis, the stop ring 137 will not abut against, but bypass the arresting strip 143 during forward .., movement, as will be explained in detail hereinafter.The setting indicator 144 (Figure 7) on the outer casing;wall of the gun, shows which discharge volume has been set.15 If this is the position "25" corresponding to the maximum dis-. charge volume, the stopping disk 125 is in the position shown in Figure 9c, which is a section along the line IX - IX of' Figure 11. The arresting strip 143; which is then in the position indicated in Figure 11 by 143a, has allowed the stop 20 ring 137, thanks to its recess 139, to pass during the forward movement of the piston rod caused by pressing the trigger, lever 120 into the grip handle 102 by hand and due to the pressure of the fork arms 123, 124 on the longitudinal ridges: 130, 130'; the forward movement of the piston rod is finally25 stopped by the fork arm 123 abutting against the end of the arresting strip 143.If the setting knob 134 is rotated 180° so that the Indi-cater 144 in Figure 7 registers with position "5", the stopping disk is in the positlo.n shown in Figures 9a, 10 and 11..!                              - 14 -I The arresting strip 143 is below and parallel to the long-. .itudinal axis of the piston rod, i.e. the position shown by 143 in Figure 11. In this manner the stop ring 137 contacts the other end, opposite that for position ,,25% of' the arresting strip 143 at the flat edge138, and the forward, movement of the piston rod is stopped after a very short dis-i charg! stroke.:      If the setting knob 134 is rotated by another 90° so thati. the indicator 144 in Figure 7 registers with position "10",the arresting strip 143 is in the position 143b indicated ini Figure 8    phuiiLuiff־linos, and the forward movement of the pis: ton rod 11 is limited by the impact of the entire surface of . the flat edge 138 of the stop ring 137 (in the position 137b) below the recess 139 against the entire side edge of the arresting strip 143.׳• Finally, if the setting knob is rotated ' so־ that the indicator 144 in Figure7 ׳ registers with position "15" ,on setting knob 134, the arresting strip 143 is in the position shown.in Figure 9b, and the forward movement of the piston rod 11, when the trigger lever 120 is pressed into the grip handle 102, is stopped by abutment of the side surface of the stop ring 137, next to the flat edge 138 thereof, against one of the side surfaces of the arresting strip 143.On the side opposite the stopping means, there is provide in the casing wall an opening 45 through which the screw 36, or 136, respectively, can be removed, e.g. by means of a screw driver, so that the stopping means and the setting knob can be separated from one another and be replaced.

Claims

CLAIMS1..        A squirting or drenching gun having adoeage-regulating device for the administration of liquid in determined doses, which gun comprises a gun casing, a piston for sucking liquid doses into, and expelling liquid doses from a chamber in the said gun casing, the piston being mounted on a hollow piston • rod which projects from the rearward end of the gun casing and is connected outside the gun casing to a liquid supply line, a mouthpiece equipped with a discharge ־valve and a trigger lever arranged such that the expelling stroke of the piston is effected by manual operation of the said trigger lever; while the sucking stroke of the piston is effected: by means of a spring member acting upon the trigger lever and via the said lever upon the piston rod and upon the piston, and wherein the dosage-regulating device comprises means which limit the stroke of the piston to a length corresponding to a determined liquid volume, said stroke-limiting means being located rearward of said chamber and being adapted to engage at least one stop means connected to said piston rod, and wherein the stroke-limiting means comprises a stopping disc serving as or bearing an arresting member and being adjustable solely by turning of a setting knob provided on the outside of the gun casing, the stopping disc being arranged at the inner sidewall of the gun casing at about the level of the piston rod in the region between the rearward wall of the gun easing enclosing the piston-rod and the rearward end of the chamber.״‘2.        A squirting or drenching gun according to Claim 1, wherein the setting knob is detachably joined to the stopping disc so as to turn the disc in unison therewith, when rotated•3.        A squirting or drenching gun according to Claim 1 or 2, wherein the stopping disc is circular and has an arresting strip along a chord on said disc and projecting from the circular face of the disc toward the piston rod.

4. A squirting or drenching gun according to Claim 3, wherein the stop means comprises a stop ring rigidly mounted on the piston rod and extending far enough inthe direction of the stopping disc so as to abut against the arresting strip, but not against the disc itself, thereby limiting movement of the piston rod in one direction when the arresting strip is in one of its two possible stroke-limiting positions parallel to the axis of said piston rod.5•        A squirting or drenching gun according to Claim 4,wherein the stop means further comprises an arm provided at the upper end of the trigger lever which is movably connected to the piston rod and wherein the stop ring is provided with a marginal recess, whereby, when the arresting strip is in the other one of its two possible positions paiallel to the axis of the piston rod, the top ring can move past the arresting strip and the stroke of the piston 18 limited by the arm abutting against the arresting strip.18 -6.A squirting or drenching gun according toClaim 5 wherein limitation of the piston stroke Is effected during expelling forward motion depending on the positioning of the stopping disc and the arresting strip thereon, by abutment against the arresting strip either of the arm at the upper end of the trigger leveror of the stop ring on the piston rod7$• A squirting or drenching gun substantially as hereinbefore described with reference to the accompanyingdrawingsEHA:CBJ.H. GEIGY A.G.                           EIGHT SHEETז3J.H. ׳U?T(!v U.S.                                 HMHT !;MEET';J.R. GEIEY A.S,EI3HT SHEETSSHEET NO. לOT'A.S. ' BIGHT sums{׳ •>ז.ז,SHEW NO. 6L *ON iMNHSiLHtl&l                             ' *C‘V AGISO *H״fbiijht 31-mTsSHB? NO. 8