Trigger-type liquid dispenser

Details Trigger-type liquid dispenser Trigger-type liquid dispenser

1999-12-22

2001-07-31

Derakshani, Philippe (Department: 3754)

Dispensing

With discharge assistant

With material supply container and discharge assistant with...

Reexamination Certificate

active

06267271

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a trigger-type liquid dispenser. More particularly, the present invention relates to a spring member made of synthetic resin in the trigger-type liquid injector, and a rotational mechanism of a nozzle head.
There are a lot of disclosure of a synthetic resin trigger-type liquid dispenser or injector for atomizing, injecting and injecting in the form of foaming.
Such known trigger-type liquid dispenser comprises an injector body having an inverted L-shaped side shape, a nozzle head mounted at a front end of the injector body, a trigger hinged at a front portion of the injector body, a pump mechanism in the injector body, said pump mechanism including a plunger, and a coil spring for returning the plunger, which spring is made of metal. A cover is mounted outside of the injector body. The injector body includes a mounting cylinder and a suction pipe at its lower end. The trigger liquid dispenser is mounted to a neck of a container storing liquid at the mounting cylinder. The suction pipe is inserted into the container. When the trigger is pulled, the pump mechanism sucks liquid from the container to the nozzle head, through which the liquid is atomized, injected, or injected in the form of foaming, etc.
Recently, it is required to reuse waste products as resources with the increase of waste products, and therefore a spring member made of synthetic resin has been proposed. However, the conventional spring member made of synthetic resin has the following disadvantages.
If a spring constant is uniform in whole of the spring member, it tends to concentrate an internal stress to a portion at which the spring member is fixed to the injector body. Thus, when the trigger is used above the setting times, there is a possibility of fatigue breakage. If a spring constant is uniform, internal stress is uniformly dispersed. Thus, if a spring constant varies gradually, a required spring elasticity may not be obtained, or an operating power is required too much.
SUMMARY OF THE INVENTION
Therefore, it is the object of the present invention to prevent the internal stress from concentrating. In order to achieve the object, a locus of an elastic deformation is set to be an arc locus having a constant tangent line, and to decrease a diameter of locus gradually. Because of such locus of an elastic deformation, when a spring is returned to the original, an insufficient spring elasticity can be compensated by rebound resilience of substantially constant-load plate spring. In addition, a soft and tough operating feeling can be obtained. Further, spring member can be easily assembled, the assembled spring member is securely fixed.
In order to solve the above-described object, according to the present invention, provided is a trigger-type liquid dispenser comprising an injector body having an inverted L-shaped side shape, a nozzle head mounted at a front end of the injector body, a trigger hinged at a front portion of the injector body, a pump mechanism in the injector body, said pump mechanism including a plunger, and a spring member; characterized in that the spring member is made of synthetic resin, and comprises a base plate and a pair of spring pieces for returning the plunger; each of said spring pieces comprises a main plate spring, a second plate spring and a lower end; said main plate spring is positioned at nozzle head side, and has a schematically arcuate longitudinal section; said second plate spring is positioned at plunger side, and has a longitudinal section constituting a substantially constant-load plate spring; said main plate spring and said second plate spring are connected each other at an upper end and a lower end thereof; and a locus of elastic deformation of the main plate spring substantially coincides with an arc locus including a tangent line in an upper surface of the base plate.
Preferably, fit fixing means are provided between the base plate of the spring member and receiving seats provided on the injector body, so as to fix the base plate with the injector body. In addition, preferably, the trigger is provided with a pair of pockets at a middle portion of both right and left sides of the trigger, and each of the lower ends of the spring pieces of the spring member is inserted into each of the pockets. According to such construction, the trigger-type liquid dispenser can be easily assembled by only inserting the base plate of the spring member into the receiving seats of the injector body and by inserting the lower ends of the springs pieces to the pockets of the trigger, so that assembling is easy and the spring member is surely fixed to the injector body and the trigger.
More preferably, the front receiving seat is formed on an upper surface of the tip member, and the rear receiving seat is formed on an upper surface of a rear portion of the injection cylinder. According to such construction, the trigger-type liquid dispenser can be easily and quickly assembled.
Still preferably, the tip member may be integrally formed with a front portion of the base plate. According to such construction, the trigger-type liquid dispense can be further quickly assembled, because the step for engaging the front portion of the base plate with the tip member is omitted.
According to another aspect of the invention, the nozzle head is provided with fitting portions on an inner surface thereof, the tip member is provided with a fitting projection extending radially and outwardly, and the fitting projection is engaged with the fitting portions. Each of said fitting portions comprises a pair of fitting convex strips. According to such construction, since the fitting projection of the tip member is engaged with the fitting portion of the nozzle head, the nozzle head can be precisely positioned with the tip member.


REFERENCES:
patent: 5341965 (1994-08-01), Mass et al.
patent: 5423460 (1995-06-01), Thomann
patent: 5564604 (1996-10-01), Tada
patent: 5706984 (1998-01-01), Tada et al.
patent: 6-502701 (1994-03-01), None
patent: 2-2577228 (1998-05-01), None

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