US2123406A - Fountain pen - Google Patents

Description

`F. c. DELI FOUNTAIN PEN July 12, 193.8,

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July 12, 193s. C, DEL, f 2,123,406

FOUNTAIN PEN Filed Sept. 5, 1935 5 Sheets-Sheet 2 F. C. DELI FOUNTAIN PEN July 12, 193s.

Filed Sept. 3, 1935 3 Sheets-Sheet 3 @.0 WW QN NN 3 @@W@ 3&2@ s.

Patented July 12, 1938 UNITED STATES PATENT OFFICE FOUNTAIN PEN Frank C. Deli, Chicago, Ill., assigner to Autopoint Company, Chicago, Ill., a corporation of Il linois Application September 3, 1935, Serial No. 33,8%

9 Claims.

Vwith plunger type filling devices have the disadvantage that the ink sooner or later nds access to some part of the reciprocating mechanism and sooner or later causes deterioration of the same. rThis objection I have eliminated in the present invention by mounting the reciprocating mechanism within an elongated elastic rubber diaphragm which is sealed to the rear end of the barrel and prevents access of the ink to the reciprocating mechanism, while at the same time permitting longitudinal back and forth motion of the plunger.

Among the objects of my invention is to provide a fountain pen accomplishing the foregoing results, and which at the same time is neat and attractive in appearance and easy to operate.

A further object is to provide a fountain pen having lling mechanism of the plunger type; so constructed that its parts are easy to assemble, will not easily get out of order, and are readily accessible for inspection, adjustment or repair.

.A still further object is to provide apparatus of the class described that is economical to manufacture, eicient in operation and durable in construction.

Another object is the elimination of an air tube extending into the barrel from the forward end, and thus provide a longer stroke for the plunger and at the same time protect the parts of the reciprocating mechanism from contact with the ink, thus combiningquick lling with long life.

A further object is to provide novel means for firmly and non-leakably securing the elongated rubber diaphragm to the rear end of thepen barrel.

Other objects, advantages and capabilities will later more fully appear.

My invention further resides in the combination, construction and arrangement of parts il-a lustrated in the accompanying drawings,4 and while I have shown therein preferred embodiments I wish it understood that the same are susceptible of' modification and change without departing from the spirit of my invention.

In the drawings:

Fig. l is an enlarged longitudinal section partly in elevation of a fountain pen embodying my invention. v

Fig. 2 is a View similar to Fig. 1, partly broken away, but showing the plunger advanced to the forward end of the barrel. Y

Fig. 3 is an enlarged detail longitudinal section of the plunger operatinghandle, the removable plug for securing the rubber diaphragm in place, 5 and the threaded plunger propelling screw.

Fig. 4 is an enlarged detail longitudinal section of the plunger, diaphragm and some of the associated parts.

Fig. 5 is a transverse section on the line 5-5 101 of Fig. 1.

Fig. 6 is an enlarged elevation of the sleeve `within which operates the reciprocating mechanism.

Fig. '7 is an end elevation of Fig. 6.

Fig, 8 is a transverse section on the line 3'-8 of Fig. 2.

Fig. 9 is an enlarged longitudinal section, partly in elevation, of a modiiied form of my invention.

Fig. 10 is a fragmentary section similar to the right hand portion of Fig. 9, but showing the plunger rod retracted and in position to advance the plunger.

Fig. 11 is a view similar to Fig. 10, but showing 25 the plunger in advanced position.

Fig. l2 is an elevation of the sleeve fixed to the plunger'for movement therewith.

Fig. 13 is an enlarged transverse section on the line |3-l3 of Fig. 12. 3p

Fig. 14 is an enlarged transverse section on the line lll-I4 of Fig. 12.

Fig. 15 is an elevation of the plunger operating rod.

Fig. 16 is a view similar to Fig. 15, but showing 35 the rod rotated on its longitudinal axis through an angle of 90.

' Fig. 1-7 is an enlarged transverse section on the line Il--I'l of Fig. 15.

Fig. 18 is an enlarged transverse section on the 40 line iii-i8 of Fig. 16.

Fig. 19 is an enlarged view similar to Figs. 1 and 9, but showing a further modication.

Fig. 20 is an enlarged fragmentary longitudinal section showing the plunger head in its forward position.

Fig. 21 is an enlarged fragmentary longitudinal section showing the'control handle and plunger head in retracted position.

Fig. 22 is a transverse section on the line 22-22 50 of Fig. 20.

Fig. 23 is a detail elevation of one of the clamping members for the rubber bag.

Fig. 24 is an enlarged longitudinal section of the control handle.

Fig. 25 is a plan view looking toward the inner end of the control handle.

Fig. 26 is an enlarged longitudinal sectional view through the control handle, showing a slightly different form from that shown in Fig. 19.

Fig. 27 is a view similar to Fig. 26, but the section being taken on a plane at right angles to that of Fig. 26.

Fig. 28 is an enlarged detail section through one end of the rubber bag, the plunger head and associated parts.

Referring in detail to the drawings, Figs. l to 8 show one embodiment of a fountain pen embodying my invention, comprising the barrel I, provided at its forward end with the usual nib 2, pen section 3 and associated parts, including the usual feed bar and ink duct (not shown). Formed in the barrel I adjacent its rear end is the internal annular shoulder 4, upon which is seated a washer or the like 5, against the outer face of which Washer is positioned the laterally extending marginal flange 6 of the elastic rubber bag 1. Positioned against the outer face of flange 6 is a washer 8, and tightly clamping the flange 6 between washers 5 and 8 is the clamping plug 9, which is provided with screw threads I0 engaging similar threads formed on the interior of the rear end of the barrel I. Formed in the outer end of plug 9 are openings II to receive the prongs of a Spanner wrench or the like for rotating the plug 9 to clamp the marginal flange 6 between the shoulder 4 and plug 9.

Clamping plug 9 is formed at its outer end with the reduced unthreaded portion I2, upon which is rotatably mounted the skirt portion I3 of the control handle I4. The portion I2 being unthreaded permits free rotation of control handieV I4. In the outer face of control handle I4 is formed the recess I5 and the annular shoulder I'E, against the latter of which after the parts have been assembled is seated and secured the button or disc I1. Control handle I4 is also provided with the longitudinal opening I8, through which passes the rod I9 formed at its outer end with threads 20 upon which are threaded nut 2I for tightening and holding rod I9 securely to control handle I4 for movement therewith. .Also for convenience in permitting the projections of the Spanner wrench to reach into openings II when the parts are assembled and it is desired to unscrew clamping plug 9, control handle I4,is provided with openings 22 which may be moved into registry with openings II before button I1 is secured in position.

Rod I9 is provided with threads 23. Adjacent the inner end of rubber bag 1 is plunger head or piston 24, which is shown as comprising three (any other suitable number may be used) discs, which may be made of cork, rubber, composition material or any other suitable material. Secured to plunger head or piston 24 by means of washer 25 and machine bolt 26 is the elongated tubular member 21 which passes through the plunger head, the washer 28, the end of the rubber bag 1, and the button member 29, into the interior of the rubber bag 1. Just beyond the button member 29 the tubular member 21 is slightly increased in diameter to receive the rod I9. At its outer end tube 2! is slightly reduced in diameter at 3D, this reduced portion being provided with screw threads 3l to engage the threads 23 on rod I9.

Surrounding that portion of tubular member 21 that is within the rubber bag 1, is an elongated sleeve member 32, which at its inner end passes through the opening in the button member 29 and contacts with the inner face of said button member, and at its other end passes through the neck of the rubber bag, and through the washer 8, it being flanged over the outer face of the last mentioned washer, as shown at 33.

Rotation of control handle I4 in one direction will cause the plunger head 24 to advance toward the forward end of the barrel because of the overall length of the elongated tube 21 and rod I9 being increased by reason of threads 23 of rod I9 carrying the reduced portion 30 and tube 21 to the left as viewed in Fig. l, the elastic rubber bag stretching during this movement and the parts extending to the position and in the manner shown in Fig. 2. When the parts are in the position shown in Fig. 2, the plunger head 24 will act as a piston to suck ink into the barrel upon the control handle I4 being rotated in the opposite direction to withdraw the plunger head 24 backward into retracted position, the ink being sucked in through the usual ink ducts in the feed bar, it being understood that during this operation of sucking ink into the barrel the nib is dipped down into the ink. If the first operation does not suck a sufficient quantity of ink into the barrel to ll it, the operation described above may be repeated any number of times desired. If desired, a suitable washer or thrust member 34 may be inserted in the end of the cavity 35 at the upper end of the threads 23.

It is thus seen that I have provided a filling device for a fountain pen in which the ink is prevented from access to the mechanism for causing the reciprocation of the plunger head. Even should any ink leak past the plunger head, it could not get into the mechanism for causing reciprocation because of its being prevented access thereto by the rubber bag. The screw 26 lls the hole in the forward end of tube 21 and thus prevents access of ink to the interior of this tube. The rubber bag is rmly clamped between the button member 29 and the washer 28 by reason of the tightening of the machine screw 2B, which tightly clamps the associated parts between the washer 25 and shoulder 35. Should any ink leak past the plunger head 24, it not only will be prevented access to the reciprocating mechanism by reason of rubber bag 1, but it will also be prevented from leaking at the rear end of the barrel by reason of the marginal flange 6 of the rubber er head 21 and associated parts during rotation of the control handle I4, the outer sleeve 32 is non-circular in shape, it being shown as hexagonal, and it passes through a similarly shaped opening in the washer 8. That portion of the tubular member` 21 which slides within sleeve 32 is also similarly shaped, in the form illustrated this being shown as hexagonal in Fig, 5, so that this non-circular external shape will prevent idle rotation of the plunger head 24 during rotation of the control handle I4 and rod I9.

When it is desired to remove the lling mechanism from the barrel for inspection, repairs, or the like, this can be done by unscrewing clamping plug 9 after having removed the button I1, nut 2I and 'cap I4 (or by inserting the projections of a spanner wrench through openings 22 and I I when it is not desired to remove control handle I4 from plug 9). Upon removal of plug 9 the washers 5 and 8 and rubber bag 1 may be withdrawn together with the plunger head 24 from the barrel.

After inspection, repairs, or the like, these parts may be returned to the barrel and securedin place therein in the manner set forth earlier in' the specification.

The embodiment shown in Figs. 9 to 18 will now be described. In the embodiment shown in Figs. 9 to 18, in clamping the rubber bag 1 to the outer end of the barrel I, the outer washer 31 is formed around its central opening with a downwardly extending flange 38, arranged at an angle similar to the angle of the neck 39 of the rubber bag, and within the central opening of the washer 31 is positioned the elongated tubular member 49, which at its outer end contacts with the clamping plug 4l, which is screwed into clarnping position in a manner similar to that of the clamping plug 9 shown in Fig. 1v, to prevent leakage of ink at this end of the barrel.v Control handle 42 is formed at its inner end for a short distance with the reduced portion 43, formed around its exterior with screw threads 44 to engage with the screw threads in the rear end of the barrel after the clamping plug 4l has been screwed into place.

Passing through control handle 42 is the rod 45, which has the upset non-circular portion 46 at its outer end seated in the similarly shaped recess 41 in the control handle 42, so that rod 45 will move with control handle 42. After the non-circular upset portion 46 has been seated in recess 41, the same is covered by securing the button 48 in the shouldered portion 49, which closes this end of the control handle and holds rod 45 in proper position. As seen in Figs. 9, 10 and 11, rod 45 extends telescopically into the tubular member 40 and mis formed on one side with the lateral projection 5U, which when in alignment therewith may slide longitudinally along slot 5| formed in one side of tubular member 49. Near the outer end of tubular member 4l] is a laterally extending slot 52, into which projection 59 may be turned when in registry therewith by rotating rod 45. Near the forward end of tubular member 40 is the enlarged portion 53, into which projection 50 may be turned when in registry therewith by rotating rod 45. The enlarged portion 53 is annular in shape and of suiicient length to permit threads 44 to be unscrewed from the rear end of the barrel before projection 50 strikes the normal diameter of tubular member 40. Tubular member 40 extends through the plunger head -2f4 and is riveted or upset over the washer 25, which eliminates the necessity of using the screw 26. The forward end of tubular member 45, after the parts are assembled and before introduction into'the barrel, will be filled by a plug 54 of rubber, solder, or any other suitable material, to prevent leakage of ink into the interior of tubular member 40.

In operation of the form shown in Figs. 9 to 18, assuming the parts in the position shown in Fig. 9, if desired to ll the barrel with ink, thev control handle 42 will be rotated to unscrew threads 44 from the rear end of the barrel I, which unscrewing movement will be permitted by reason of the length of the enlarged portion 53 of tubular member 411 being longer than the length of the threaded portion 44. When threads 44 have been thus disengaged from the complemental threads in the rear end of the barrel, the lateral projection 59 of rod 45 will be brought into registry with slot 5I and control handle 42 and rod 45 pulled rearwardly until projection 5l) comes in registry with slot 52, at which time control handle 42 will be rotated a slight distance in. a clockwise direction as viewed from the right-hand end of Fig. 9, so as to carry projection 50 into slot 52.

By pushing forwardly upon control handle 42, the tubular member 40 andplunger head 24 will be projected forwardly in the barrel l to the position shown in Fig. 1,1. By dipping the writing end of the' pen into ink and then pulling the control handle 42 rearwardly so as to move the plunger head 24 rearwardly in the barrel, ink willbe sucked thereinto. If necessary this pistonlike movement can be repeated any desired number of times until the desired quantity of ink has been sucked into the barrel. When the barrel has the desired amount of ink in it, the control handle' 42 and rod 45 will then be pulled rearwardly toy their limit and rotated in a counter-clockwise direction as viewed from the right-hand side of Fig. l0, until the projection 55 is moved into alignment with the longitudinal slot 5l. Control handle 42 is then pushed inwardly to move projection 5l) along slot 5l and into the enlarged portion 53 and the threads 44 screwed into the corresponding threads in the rear end of the barrel, which when completed will bring projection 50 into the position shown in Fig. 9, and the pen is then ready for use.

1n the embodiment shown in Figs; 19 to 28, the plunger head 24 is provided with a rearwardly extending tubular member 55, which is formed with a spiral trackway 55, in which isspirally movable the' projections 51, of which there can be any desired number (one or more). In this embodiment the' screw 25 of the form shown in Fig. 1 is used for securing the plunger head 24 to the tubular member 55, and the rear end of the rubber bag 1 is secured to the rear' end of the barrel in a manner similiar to that of the embodiment shown in Figs. 9 to 18. The control handle 53 is, how-- ever, differently formed than those heretofore described, and comprises the recessed portion 59, in the rear en-d of which is formed the non-circular opening 5U, into which is seated the upset non-circular portion 5l of the rod 52. When this upset portion 6| is seated in the similarly shaped opening E@ in control handle 5S, the lling plug 63 is inserted into the opening 59 with a more or less tight t to hold these parts together.

In the form shown `in Figs. 19 to 28, the forward end of the control handle 59 is reduced in diameter at B4, and slidably and rotatably nts in the rear end of the barrel l, no threads being provided vat this place in this embodiment.

In the embodiment now being described, when it is desired to introduce ink into the barrel, and assuming the parts to occupy the position shown in Fig. 19, the control handle 58 will be rotated in one direction (depending upon whether the spiral trackway is right-hand or left-hand), which by reason of the projection or projections 51 moving in the spiral trackway 55 will cause the tubular member 55 and associated parts to move to the left, as shown in Fig. 19, which will carry the plunger head 24 to the left to the position shown in Fig. 20. The control handleV 58 may now be pulled rearwardly (to the right as viewed in Fig. which will cause the plunger head 24 to move to the right to the position shown in Fig. 2l, and at the same time sucking ink into the barrel l. If it is desired to suck more ink into the barrel than this one movement will accomplish, the control handle 58 may be pushed back and forth any desired number of times, which will cause the plunger head 24 to reciprocate in the barrel. When a sufficient amount of ink has been thus introduced into the barrel, the control handle 53 is moved into the position shown in Fig. 21 to bring the parts within the barrel into retracted position, after which rotation of the control handle in the opposite direction from that referred to above for projecting the plunger head 24 forwardly, will screw the projections 51 into the tubular member 55, and thus return the parts into the position shown in Fig. 19, and the pen is then ready for use.

As shown in Figs. 26 and 27, the recessed portion 59 may be omitted from control handle 58 and the non-circular portion 6l of rod 62 be seated in a similarly shaped opening in the outer face of the control handle, and then covered up by securing in the position shown the button or disc I1. Also when the tubular member 55 is secured to the plunger by burring or swaging over the end of the tubular member as shown in Fig. 28, the open forward end of said member will be filled up with the plug 54 as described in connection with Figs. 9 to ll to prevent entry of ink into the interior of the member.

If desired, the barrel may be made of transparent material so that the user can see the amount of ink in the barrel and thus rell the same at any time desired. Also the other parts may be made of any desirable materials suitable for the purpose. It will thus be seen that I have provided in a fountain pen a filling device of the plunger type, in which leakage of ink from the barrel is entirely prevented and the ink is unable to find access to the mechanism by which the plunger head is reciprocated. This results. in a fountain pen which may be easily and quickly filled with ink and will be of long life, with the working parts out of contact with the ink.

Having now described my invention, I claim:-

l. In a fountain pen, a barrel having an open rear end and an internal shoulder spaced inwardly from the open end, an elastic rubber bag having at one end a laterally extending marginal flange, a clamping plug adapted to be firmly seated in the open end of the barrel to tightly clamp the marginal flange between the shoulder and the clamping plug, a plunger head at one end of the rubber bag, an elongated tubular member secured to said head and extending into the bag, a control handle movably associated with the rear end of the barrel, a rod fastened to said control handle to move therewith, said rod being telescopically slidable in said tubular member, a lateral projection on said rod, a longitudinal slot in the tubular member adapted to slidably receive the projection on the rod, an-d spaced apart lateral openings in the tubular member into which said projection may be rotated to permit the joint length of the rod and tube to be increased to enable reciprocation of the plunger when the projection is in one of said lateral openings and hold it against reciprocation when it is in the other of said lateral openings.

2. In a fountain pen, a barrel having an open rear end and an internal shoulder spaced inwardly from the open end, an elastic rubber bag having at one end a laterally extending marginal flange, a clamping plug adapted to be firmly seated in the open end of the barrel to tightly clamp the marginal flange between the shoulder and the clamping plug, a plunger head at one end of the rubber bag, an elongated tubular member secured to said head and extending into the bag, a control handle rotatably mounted on said clamping plug, a rod extended through said clamping plug and fastened to said control handle to move therewith, said rod being threaded throughout a portion of its length, internal threads in said tubular member with which the threads on the rod engage to cause longitudinal movement of the tubular member when they controlhandle and rod are rotated to enable the overall joint length of the rod and tubular member to be increased or decreased as desired, whereby when said joint length is increased the plunger head may be moved back and forth to suck ink into the barrel, and when said joint length is decreased a certain amount the plunger head may be held against longitudinal movement.

3. In a fountain pen, a barrel having an open rear end and an internal shoulder spaced inwardly from the open end, an` elastic rubber bag having at one end a laterally extending marginal flange, a clamping plug adapted to be firmly seated in the open end of the barrel to tightly clamp the marginal flange between the shoulder and the clamping plug, a piston head at one end of the rubber bag, an elongated tubular member secured to said head and extending into the bag,

a control handle movably associated with the rear end of the barrel, a rod fastened to said control handle to move therewith, said rod having a lateral projection thereon, said tubular member being formed with a spiral trackway to slidably end open, an internal shoulder adjacentv the rear end, internal threads formed in the open end of the barrel adjacent said shoulder, an elastic rubber bag in said barrel and having a laterally extending marginal flange, a threaded clamping plug adapted to clamp said marginal ange between said shoulder and said plug, a piston head secured to said bag at its opposite end, an elongated member secured to the piston head and extending into the bag, a control handle rotatably associated with said clamping plug and movable toward and away therefrom, an elongated member secured to the control handle and slidably mounted in said clamping plug, said last mentioned elongated member extending' into the rubber bag and having engagement therein with the first mentioned elongated member so that the overall length of the two elongated members may be increased or decreased upon manipulation of the control handle, said rubber bag preventing access of ink to the interengaging portions of the elongated members but permitting reciprocation of the piston head inthe barrel.

5. In a fountain pen, a barrel, a filling device of the piston type comprising a piston head slidably engaging the inner face of the barrel to draw ink thereinto by suction, and parts for causing reciprocation of the piston head, said parts having a control handle and a pair of interengaging members one being carried by the control handle to move therewith and the other being secured to the piston head to cause movement thereof, said interengaging members being formed to be lengthened or shortened as a whole upon movement of one with relation to the other, an elastic rubber bag sealed to the rear end of the barrel and extending a distance into the barrel, said bag being stretched as the piston moves forward, a shoulder on the said interengaging member that is secured to the piston head, said shoulder being adjacent the piston head, and a button member abutting said shoulder, the end of the bag being rmly clamped between said button member and the rear face of the piston head with the piston head outside of and in front of the bag, the rubber bag sealing said interengaging members from contact with ink.

6. In a fountain pen, a barrel-like body adapted to contain ink and open at one end, an elongated bag of liquid-proof elastic material having its mouth provided with a radially Idisposed marginal anchor viiange, means for anchoring said flange at a position adjacent to the open end of said body and in such manner that the bag' extends its full normal length into the body while in retracted condition, a control handle movably supported contiguously to the open end of the body, a piston of approximately the same diameter as the internal diameter of the body and movable therein, an actuator rod secured to said handle and extended longitudinally into said bag through the mouth thereof, a longitudinally disposed extension member located Within the bag and telescoping with the actuator rod and having its outer end extended through the closed end of the bag and connected with said piston, and means cooperating with said piston for securing the closed end of the bag to said extension member in such manner as to move therewith, said actuator rod and said extension member having complemental inter-engageable portions so arranged as to eifect longitudinal movements of said extension member in such manner as to move said piston and to simultaneously stretch or collapse said bag. Y

7. In a fountain pen, a barrel-like body adapted v to contain ink and open at one end, said barrel having an internal annular shoulder contiguous to said open end, an elongated bag of liquid-proof elastic material having its mouth provided with a radially disposed marginal ange, means engaging said iiange and cooperating With said shoulder to anchor said anged portion of said bag in such manner that the bag extends its full normal length into said body while in collapsed condition, a control handle engaging the open end of the body and free for rotative and axial movements with respect to the latter, a piston of approximately the same diameter as the internal diameter of the body and movable therein, an actuator rod secured to said handle and extended longitudinally into said bag through the mouth thereof, an extension member also located within said bag and telescoping with the actuator rod and axially movable with respect thereto, said extension member having its outer end extended through the closed end of the bag and connected with said piston, and means for clamping the closed end of the bag to said piston in such manner as to move therewith, said actuator rod and said extension member having complemental inter-engaged screw threaded portions so arranged as to eiiect relative longitudinal movement thereof by means of rotative movements applied to said handle.

8. In a fountain pen, a barrel-like body adapted to contain ink and open at one end, an elongated bag of liquid-proof elastic material having its mouth provided with a, radially disposed marginal anchor flange, means for anchoring said flange at a xed position adjacent to the open end of said body and in such manner that the bag extends its full normal length into the body while in collapsed condition, a control handle engaging the open end of the body and free for rotative and axial movements with respect to the latter, a piston of approximately the same diameter as the internal diameter of the body and movable therein, an actuator rod secured to said handle and extended longitudinally into said bag through the mouth thereof, an extension member telescoping with said actuator rod and axially movable with respect thereto, said extension member located within the bag and having its outer end provided with a reduced portion extended through the closed end of the bag and also through said piston, means for securing the piston in fixed relation with respect to said reduced portion of the extension member, and means also carried by the reduced portion of the extension member for clamping the closed end of said bag against said piston in such manner that said closed end is movable with the piston, said actuator member and said extension member having complemental inter-engaged screw threaded portions so arranged as to effect relative longitudinal movements thereof by means of movements applied to said handle, and movements of said extension member will impart corresponding movements to the piston and will simultaneously stretch or collapse said bag.

9. In a fountain pen, a barrel-like body adapted to contain ink and open at one end, said 'body having an internal annular shoulder contiguous to said open end, an elongated bag of liquid-proof elastic material having its mouth provided with a radially disposed marginal anchor liange, washers gripping said flange and resting against said shoulder, an anchor disk cooperating with said shoulder to secure said ange and said washers in normally fixed position, and in such manner that the bag extends its full normal length into said body while in collapsed condition, a control handle having a reduced portion extended into the open end of said body, said handle being free for rotative and axial movements with respect to the body, a piston movable within said body, and an actuator rod secured to said handle and extended longitudinally into said bag through the mouth thereof, said rod having a threaded portion at its outer end, a tubular extension member also located within the bag and telescoping with said actuator rod, said extension having threaded portions complemental to the threads upon said actuator rod, said actuator rod and said extension member being axially movable with re speci; to each other in such manner that the extension member is adjustable toward and from said shoulder, said extension member having a reduced outer end,extended through the closed end of said bag, a piston movable within said body and secured to said reduced end, and means for clamping the closed end of said bag against the inner face of said piston in such manner that movement of the extension member will be imparted to the piston and will stretch and collapse Vsaid bag longitudinally within the barrel.

FRANK C. DELI.

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