Device for the metered delivery of a viscous liquid

Pumps – Expansible chamber type – Plural pumping members in single pump chamber

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C417S487000, C222S221000

Reexamination Certificate

active

06705845

ABSTRACT:

PRIORITY CLAIM
The present application claims priority under 35 U.S.C §119 based upon Swiss Patent Application 2001 1194/01 No. filed Jun. 28, 2001.
FIELD OF THE INVENTION
The invention concerns a device for the metered delivery of a viscous liquid.
BACKGROUND OF THE INVENTION
A device for the metered delivery of a viscous liquid is known from the Singapore patent application SG 0074739. This device comprises a pump body with a drill hole which connects an intake chamber and a discharge chamber. In this drill hole, two pistons are moved back and forth between the intake chamber and the discharge chamber. A slot of variable width is formed between the faces of the two pistons so that the liquid in the intake chamber fills the slot and is pressed out of the slot into the discharge chamber. To guide the pistons, guide rails are present which are guided in further, parallel running drill holes.
This device has two disadvantages. When used for applying adhesive, it can happen that flakes of silver contained in the adhesive make their way to the outside of the pump body and from there into the drill holes which accommodate the guide rails which leads to the guide rails sticking. Furthermore, the friction of the guide rails in the drill holes is too great.
The object of the invention is to rectify the above mentioned shortcomings.
BRIEF DESCRIPTION OF THE INVENTION
The invention shows on the one hand an improved drive mechanism as well as certain constructive measures which prevent the drive mechanism from sticking and, on the other hand, a pump body which is particularly suitable for the metered delivery of adhesives which contain flakes of silver. This pump body distinguishes itself in that the drill hole which connects the intake chamber with the discharge chamber is extended whereby the two pistons which are moved back and forth in the drill hole form a slot seal at the ends of the drill hole. In order that the slot seal is sufficiently tight, the piston and the pump body or a sleeve incorporated into the pump body which contains the drill hole are, on the one hand, paired with suitable materials and, on the other hand, are manufactured with the highest precision.
In the following, an embodiment of the invention is explained in more detail based on the drawing.


REFERENCES:
patent: 2169807 (1939-08-01), Lyon
patent: 2529457 (1950-11-01), Nilsson
patent: 3695788 (1972-10-01), Loomans
patent: 5580227 (1996-12-01), Rappenhoner
patent: 5639220 (1997-06-01), Hayakawa
patent: 6079960 (2000-06-01), Funatsu et al.
patent: 6499972 (2002-12-01), Yatsuzuka et al.
patent: 2 617 541 (1989-01-01), None
patent: 9903371 (1999-07-01), None
European Search Report, for International Application No. EP 02 01 3231, date mailed Oct. 2, 2003.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Device for the metered delivery of a viscous liquid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Device for the metered delivery of a viscous liquid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for the metered delivery of a viscous liquid will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3204719

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.