Dispensing – Collapsible wall-type container – With wall-collapsing means
Reexamination Certificate
1999-10-25
2001-07-03
Kaufman, Joseph A. (Department: 3754)
Dispensing
Collapsible wall-type container
With wall-collapsing means
Reexamination Certificate
active
06253962
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns a device for squeezing tubes comprising two press rolls facing each other which can be placed onto the sides of a tube, and spring clamps with two essentially parallel oriented tensioning elements, which are led through the press rolls and form axes of rotation for the press rolls and pressing them against each other.
2. Description of the Prior Art
Devices of such type are known in many layouts. Apart from propositions according to which the press rolls are supported in a holder frame and one of the rolls is driven via a teeth and lever mechanism with a reverse locking device (DE-A1-3007015 and CH-A-605'302) also a device is known in which the press rolls are toothed longitudinally and are supported in mutually connectable U-frames in which arrangement one of the press rolls is provided with a turning handle (CH-A-635043). Furthermore it has been proposed that the end portions of the press rolls be interconnected by elastic tensioning rings and that the pair of press rolls be placed onto the tube manually (U.S. Pat. No. 5,277,335). In a further proposal instead of the tensioning rings a spring clamp is used with two tensioning elements extending essentially parallel which are led through the press rolls and form axis of rotation for the press rolls and pressing them against each other (U.S. Pat. No. 5,297,699).
None of these devices has achieved success in practical application, because either the elements of the construction were to cumbersome or too cost intensive or because handling the device proved too difficult.
SUMMARY OF THE INVENTION
Based on the layout mentioned first, it is the object of the present invention to improve this design in such a manner that on one hand simple elements can be used in the device and that on the other hand easy handling is rendered feasible.
This object is achieved by using a layout in which pot-shaped sleeves are inserted in both face side openings of the press rolls, the inward facing pot bottom parts of the sleeves are provided with passage openings, whereas the arms of U-shaped spring clamps are guided movably through the passage openings in each of the pot-shaped sleeves which are lying over each other. The end portions of the arms of the spring clamps in this arrangement, as claimed additionally in the present invention, are provided with a protrusion each blocking the passing through the passage openings. The arms of the U-shaped spring clamps according to a further proposal of the present invention are of a length which is greater than twice the length of the pot-shaped sleeves, whereas the first part extending from the U-shaped bend is somewhat longer than the pot-shaped sleeve and extends inclined under an acute angle towards the longitudinal centre axis of the U-profile of the U-shaped spring clamp, and the adjacent second part is of about the same length as the first part and is inclined correspondingly away from said axis, and the short end part extends bent again towards the longitudinal centre axis. The pot-shaped sleeves are provided preferentially with an outer annular ring flange resting against the face side opening rim of the press rolls, and the U-shaped bend of the U-shaped spring clamp is provided preferentially with an attached grip element.
The layout of the device according to the present invention, which merely comprises the two press rolls, the pot-shaped sleeves inserted into the end portions of the rolls, and a pair of U-shaped spring clamps does not contain other elements than the ones mentioned which are easily manufactured and assembled using just a few manual or machine-made production steps. The inclination under an acute angle of the first arm parts of the U-shaped spring clamps towards the longitudinal center axis of the U-profile ensures that owing to the rotation of the press rolls the clamp is pushed longitudinally towards the inside of the roll and that it thus can not escape from the pot-shaped sleeve, whereas the inclination under an acute angle of the adjacent second part of the arm ensures that the pressure between the press rolls is released almost completely as the U-shaped spring clamps are pulled in longitudinal direction out of the press rolls. Then, the press rolls easily can be pushed onto the tube and subsequently the clamps can be brought back to their pressing position if they are pushed towards the centre using the attached grip end portions. The contact pressure is transmitted via the angled-off portions of the arms of the U-shaped spring clamps essentially to the center of the axis of the press rolls and thus permits their linear displacement without effort.
REFERENCES:
patent: 1773104 (1930-08-01), Johnson
patent: 1983462 (1934-12-01), Johnson
patent: 2358989 (1944-09-01), Marcy
patent: 5297699 (1994-03-01), Barchus
Deal David
Hardmeier Arthur
Kaufman Joseph A.
Klaniecki James E.
Speckman Ann W.
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