Dispensing – With discharge assistant – Container with follower
Patent
1987-06-12
1988-12-20
Huppert, Michael S.
Dispensing
With discharge assistant
Container with follower
222568, 405269, 604125, B67D 542, E02D 518
Patent
active
047920661
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an improved chemical liquid dispenser or injector which is of particular utility when employed in reinforcing of concrete buildings or similar structures by filling cracks in their bodies or walls with a chemical liquid.
BACKGROUND ART
For repairing walls of a concrete building, for instance, loosened from or lifted off the underlying concrete body due to cracks developed therein, there has been proposed in Japanese Utility Model Application No. 27713/85 a grease gun type chemical liquid injector adapted for automatically delivering a chemical liquid through utilization of the thrust by a spring. The conventional injector has a structure in which a chemical liquid of relatively high viscosity, contained directly in the injector casing or body, is discharged by a spring-loaded piston slidably received therein. Wit this structure, however, since the piston must be removed from the injector casing along with its cap, for loading the injector with the liquid, air is naturally entrapped in the casing between the liquid and the piston head when the piston has been re-inserted into he injector body. Consequently, as the chemical liquid is forced into, for instance, a crack in a wall by the piston, the air in the casing inevitably finds its way into the liquid being delivered, and it remains in the crack in the form of bubbles, offering a serious hindrance to the crack-mending work.
Furthermore, in the case of repairing a wall lifted off the underlying concrete body by injecting the chemical liquid into the gap therebetween, air remaining in the gap is gradually driven into its innermost part and is not purged out therefrom. This leads to a substantial reduction of the injection rate, making the repair work difficult.
It is therefore an object of the present invention to provide a chemical liquid injector which is automatically purged of air entrapped between the chemical liquid and the piston head by the insertion of the piston into the injector body, permitting efficient injection of the chemical liquid.
DISCLOSURE OF THE INVENTION
The chemical liquid injector of the present invention comprises a cylindrical injector casing or body having at one end a nozzle molded integrally therewith and adapted to threadably engage a mouthpiece and open at the other end, a piston slidably received in the injector casing, a cap threadably attached to the open end of the injector casing,, and a coiled spring mounted on the piston rod between the piston head and the cap, for applying thrust to the piston. The piston rod projects out of the injector body through the cap and is adapted to be locked to the cap, with the coiled spring held in its compressed state therebetween. The interior surface of the injector casing has cut therein a shallow air-escape groove or grooves which extend lengthwise of the casing from its open end to the position that the piston head will assume when the piston is locked at its fully retracted position in the casing.
Moreover, the mouthpiece which is threadably attached to the nozzle comprises a tapered tubular inner body made of synthetic resin and having a number of lugs formed on its outer peripheral surface and a sheath similarly made of synthetic resin and fitting closely to the inner body. The sheath has a slit along the entire length thereof, small holes for receiving the lugs of the holder, and a plurality of narrow projections formed on the interior surface of the sheath and extending in its lengthwise direction. The mouthpiece of such a construction enables air in a crack in a wall or a gap between it and the underlying concrete body to be purged out therefrom, ensuring smooth injection thereinto of the chemical liquid.
With such a structure as described above, even if a chemical liquid of high viscosity is employed, air entrapped in the injector casing can automatically be purged out therefrom through the air-escape grooves as the piston is loaded into the injector casing; so that no air bubbles form in the liquid being delivered.
Acco
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Huppert Michael S.
Huson Gregory L.
Pan American Trading Co., Ltd.
S. Safford A. Thomas
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