Dispensing – With discharge assistant – Insertable cartridge or removable container
Reexamination Certificate
1999-11-01
2001-06-05
Kaufman, Joseph A. (Department: 3754)
Dispensing
With discharge assistant
Insertable cartridge or removable container
C222S326000, C222S333000
Reexamination Certificate
active
06241130
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a tool for squeezing a single-component or multicomponent mass out of a film bag or a cartridge and including at least one piston rod connected with an element acting on the film bag or cartridge, a displacement mechanism for displacing the piston rod and including at least two axially displaceable clamping levers arranged on the piston rod and pivotable in a longitudinal direction of the tool, with one of the at least two levers serving for displacement of the piston rod and another of the at least two levers serving for locking the piston rod, at least two springs cooperating with the clamping levers, and a release lever cooperating with the clamping levers.
2. Description of the Prior Art
German Patent Publication DE-42 31 418 A1 discloses a tool for squeezing a single-component or multicomponent mass out of a film bag. The tool of this German reference includes at least two axially displaceable clamping levers mounted on a piston rod and pivotable in the longitudinal direction of the tool, two springs cooperating with the clamping levers, a discharge lever, and a release lever.
The first clamping lever, which cooperates with the discharge lever, serves for displacing the piston rod in a squeeze-out direction. The second lever serves for locking the piston rod or for preventing axial displacement of the piston rod relative to the tool housing. The release lever serves for releasing the piston rod from action of both clamping levers, so that the piston rod, after squeezing a film bag, can be manually returned to its initial position. Upon actuation of the release lever, both clamping levers are brought from their position, in which they are inclined to the longitudinal axis of the piston rod and clampingly engage the piston rod, into a neutral position in which they extend substantially transverse to the longitudinal axis of the piston rod.
During a squeezing out of large amounts of single-component or multicomponent masses, after some time, symptoms of fatigue appear in the operator which manifest themselves in that the operator can not completely push the discharge lever any more.
As a result of this, the piston rod is displaced in the squeeze-out direction only by a small amount each time the discharge lever is actuated. A maximal output speed cannot be achieved any more.
Accordingly, an object of the present invention is a tool for squeezing a single-component or a multi-component mass out of a film bag or a cartridge which would insure a reliable, fatigue-free delivery of the mass with a sufficiently high output speed, with the piston rod being displaced in the squeeze-out direction by a most possible amount.
SUMMARY OF THE INVENTION
This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a drive mechanism for effecting the displacement of the piston rod and including an eccentric disc which cooperates with the clamping lever that causes the displacement of the piston rod in the squeeze-out direction.
During the squeeze-out process, during which the squeezing of the film bag or the cartridge takes place, the piston rod of the inventive tool is displaced in the squeeze-out direction in a plurality of short, following one another intervals over a predetermined distance. For the distance, by which the piston rod is displaced, to be always the same, advantageously, the first, piston rod-displacing lever cooperates with the outer profile of the rotatable eccentric disc.
The length of the distance, by which the piston rod is displaced in the squeeze-out direction, depends on the eccentricity of the eccentric disc. Preferably, the eccentricity is selected within a range from about 5 mm to about 20 mm.
In order for the single-component or multicomponent mass to be squeezed out quickly, simply, and without the operator being tired, advantageously, the drive mechanism includes at least one drive motor with the output shaft of which the eccentric disc is operatively connected for joint rotation therewith. As a drive motor, an electric motor or, e.g., a vane motor, which is connected with a source of pressurized air, can be used.
Advantageously, a reducer is arranged between the eccentric disc and the drive motor for changing the rotational speed and a torque imparted from the drive motor to the eccentric disc.
In order to make the tool more compact and easy in operation, advantageously, the motor is turned on and off with an actuation switch. The actuation switch can be arranged, e.g., in the tool housing. However, preferably, the actuation switch is arranged in the handle which projects sidewise from an other part of the housing in which there is provided a receiving region in which a film bag or a cartridge is received. The arrangement of the actuation switch on the side of the handle facing in the squeeze-out direction insures an easy actuation of the switch by a finger of an operator's hand holding the handle.
Using an electric motor as a drive motor permits the use of the inventive tool at a work site where the only source of power is an electrical source. Advantageously, an accumulator is used as a power source for the electric drive motor. The accumulator can be detachably secured at the free end of the handle.
In order to make the tool more compact and user-friendly, the drive motor preferably is mounted in the handle. Naturally, the reducer can likewise be mounted in the handle.
The novel features of the present invention, which are considered as characteristic for the invention, are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments, when read with reference to the accompanying drawings.
REFERENCES:
patent: 4264021 (1981-04-01), Davis, Jr.
Brown & Wood LLP
Deal David
Hilti Aktiengesellschaft
Kaufman Joseph A.
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