Squirting gun and dosing device therefor

Claim 2

A squirting gun comprising a device for regulating a dosage of a liquid to be administered by said gun, a gun casing having a wall providing a cylinder chamber therein, a piston rod, a piston fixed thereon and adapted for reciprocating movement in said cylinder chamber upon a slide bearing at one end thereof, a discharge means having an outlet therein, a trigger lever engaging said piston rod and having a bifurcated end, and spring means for urging said trigger lever, piston rod and piston into one of the end positions of said piston in said chamber, the improvement comprising means providing a tubular channel in said piston rod and having means providing an opening into said chamber at the end of the rod bearing said piston, and an intake check valve mounted in the latter opening means of said piston rod, whereby an amount of liquid to be discharged can be drawn into said chamber through said channel of said piston rod and said intake check valve during rearward movement of said piston.

Claim 3

The improvement as described in claim 1, further comprising abutting means on said piston rod and stopping means connected to the wall of said casing, said abutting means and stopping means being so disposed relative to each other in said casing that the movement of the piston in one of its two directions is arrested by said abutting means abutting against said stopping means.

Claim 4

The improvement described in claim 2, wherein said stopping means for the movement of said piston comprise a stopping disk serving as an arresting member.

Claim 5

The improvement described in claim 3, wherein the said stopping means is mounted on a lateral inner wall portion of the gun casing approximately at a level with the said piston rod in a zone away from a rearmost position of said piston.

Claim 6

The improvement as described in claim 3, wherein said dosing device comprises, besides the said stopping disk, a setting knob which indicates the position of the said stopping disk, said knob being mounted on the outside of the gun casing wall, and being detachably joined with the stopping disk through an opening in the casing wall, and being adapted when rotated to carry the stopping disk along with it, whereby when detaching the knob of the stopping disk, the entire dosing device can be replaced.

Claim 7

The improvement as described in Claim 2, wherein said abutting means is located at an end of said trigger lever.

Claim 8

The improvement as described in claim 5, wherein said dosing means comprise a stop ring rigidly mounted on said piston rod and wherein said arresting member is a projection mounted on said stopping disk along a chord thereof, and said stop ring is provided with a recess whereby the forward discharge stroke of the piston is limited, depending upon the position of said stopping disk and arresting member thereon, either by the impact of said stop ring, or of one end of said trigger lever against said trigger lever against said projection.

Claim 9

A dosing device for use in a squirting gun comprising a piston mounted on a reciprocable piston rod, which piston during its intake stroke is adapted for drawing liquid to be squirted from said gun in predetermined doses into a chamber provided therefor in a casing of said gun, said gun further having discharge means including a mouthpiece with an outlet check valve therein, a trigger lever for effecting the discharging movement of the piston and spring means for effecting the movement of said piston, by action transmitted via said trigger lever to said piston rod, which dosing device comprises adjustable stopping means and abutting means mounted on said piston rod for movement therewith, said stopping means being mounted on an inner, lateral wall of said gun casing approximately at a level with said piston rod in a zone adjacent an end position of said abutting means.

Claim 10

A dosing device for use in a squirting gun comprising a piston mounted on a reciprocable piston rod, which piston during its intake stroke is adapted for drawing liquid to be squirted from said gun in predetermined doses into a chamber provided therefor in a casing of said gun, said gun further having discharge means including a mouthpiece with an outlet check valve therein, a trigger lever for effecting the discharging movement of the piston and spring means for effecting the movement of said piston, by action transmitted via said trigger lever to said piston rod, which dosing device comprises adjustable stopping means and abutting means mounted on said piston rod for movement therewith, said stopping means being mounted on an inner, lateral wall of said gun casing approximately at a level with said piston rod in a zone adjacent an end position of said abutting means.

Claim 11

A dosing device as described in claim 8, wherein said stopping means comprise a stopping disk serving as arresting member.

Claim 12

A dosing device described in claim 9, wherein said dosing device further comprises a setting knob which indicates the position of the stopping disk and which is mounted on an outside wall portion of the gun and detachably joined with said stopping disk so as to turn said disk in unison therewith, when rotated.

Claim 13

A dosing device as described in claim 8, wherein said stopping means comprise a circular stopping disk and arresting strip projecting out of the circular face of said disk toward the piston rod along a chord on said disk.

Claim 14

A dosing device as described in claim 8, wherein said abutting means comprises a stop ring rigidly mounted on said piston rod, and extending far enough in the direction of said stopping means so as to abut against the latter when the piston rod moves in one of the stroke-limiting positions of said stopping means.

Claim 15

A dosing device as described in claim 11, wherein said abutting means comprise a stop ring rigidly mounted on said piston rod in one of plural angular positions, said ring being provided with a marginal recess and said ring extending in the direction of said stopping disk so that said ring contacts said arresting strip in only one of said angular positions thereof.

Claim 16

A dosing device as described in claim 13 wherein sAid abutting means further comprises a fork arm connected to an end of said trigger lever whereby said arm movably employs said piston rod and movably engages said stopping disk, said arresting strip being movable so that alignment of the marginal recess in said stop ring with said arresting strip permits movement of the stop ring past the arresting strip with motion of the piston rod limited by impact of said fork arm against the arresting strip.

Claim 17

The improvement described in claim 2, wherein said stopping means comprise a stopping disk bearing an arresting member.

Claim 18

A dosing device as described in claim 8, wherein said stopping means comprise a stopping disk bearing an arresting member.

Claim 19

Dosage-regulating device for use in a pistol for the administration of liquid in determined doses, comprising a pistol casing having an external setting knob thereon and means providing a chamber therewithin; a reciprocable piston adapted to draw in and expel said liquid doses from said chamber, said piston being mounted on a hollow piston rod having stopping means mounted thereon and which projects from an end of said casing and is connected rearwardly outside said casing to a liquid supply line; a discharge tube connected with a valve and mouthpiece; and a trigger lever, whereby the expelling stroke of the piston is effected by manual operation of the said trigger lever; while the intake 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 connected to the latter and upon the piston; said device comprising means which limit the stroke of the piston to a length corresponding to a determined liquid volume of said chamber means, said stroke-limiting means being located rearward of said chamber and being adapted to engage at least one of said stop means connected to said piston rod, said stroke-limiting means comprising a stopping disk angularly adjustable solely by turning of said external setting knob provided, said stopping disk being arranged at the inner sidewall of said pistol casing at about the level of the piston rod in the region between the wall of the pistol casing enclosing the piston-rod and an end of the chamber.

Claim 20

Dosage-regulating device for use in a pistol for the administration of liquid in determined doses, comprising a pistol casing having an external setting knob thereon and means providing a chamber therewithin; a reciprocable piston adapted to draw in and expel said liquid doses from said chamber, said piston being mounted on a hollow piston rod having stopping means mounted thereon and which projects from an end of said casing and is connected rearwardly outside said casing to a liquid supply line; a discharge tube connected with a valve and mouthpiece; and a trigger lever, whereby the expelling stroke of the piston is effected by manual operation of the said trigger lever; while the intake 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 connected to the latter and upon the piston; said device comprising means which limit the stroke of the piston to a length corresponding to a determined liquid volume of said chamber means, said stroke-limiting means being located rearward of said chamber and being adapted to engage at least one of said stop means connected to said piston rod, said stroke-limiting means comprising a stopping disk angularly adjustable solely by turning of said external setting knob provided, said stopping disk being arranged at the inner sidewall of said pistol casing at about the level of the piston rod in the region between the wall of the pistol casing enclosing the piston-rod and an end of the chamber.

Claim 21

A dosing device as described in claim 17 wherein said stopping means comprise a circular stopping disk and an arresting strip projecting out of the circular face of said disk toward the piston rod along a chord on said disk.

Claim 22

Dosage-regulating device as described in claim 18, wherein said stroke-limiting means comprise a stop ring rigidly mounted on said piston rod and extending far enough in the direction of said stopping disk so as to abut against the arresting strip, but not against the disk itself, thereby limiting reciprocable movement of said piston rod in one direction of motion when said arresting strip is in one of two possible stroke-limiting reciprocable positions parallel to the axis of said piston rod.

Claim 23

Dosage-regulating device as described in claim 19, wherein said stroke-limiting means further comprise an arm provided at the upper end of trigger lever which is movably connected with the piston rod, and wherein said stop ring is provided with a marginal recess, whereby, when said arresting strip is in one of two possible positions parallel to the axis of the piston rod, the stop ring can move past the arresting strip and the stroke of piston is limited by said arm abutting against said arresting strip.