Fluent material handling – with receiver or receiver coacting mea – With conveying means to supply successive receivers – Sampler type
Patent
1988-10-13
1991-02-26
Recla, Henry J.
Fluent material handling, with receiver or receiver coacting mea
With conveying means to supply successive receivers
Sampler type
417474, 128DIG12, F04B 4312, G01N 114
Patent
active
049954326
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a liquid dosage equipment provided with a peristaltic pump. By its means, liquid is dosed into a group of vessels displaceable relative the nozzles of the peristaltic pump. The equipment can be used in particular in laboratories in various systems of analysis.
BACKGROUND OF THE INVENTION
Peristaltic pumps have been used commonly for transfer of liquids in applications in which the requirements of accuracy of the dose quantities are not so high.
The use of a peristaltic pump in precise dosage apparatuses has been made difficult by factors related, e.g., to the elasticity properties of the hoses and to the rotor speed and acceleration, which cause differences between the doses, in particular if the pump stands periods of different lengths between the times of use.
SUMMARY OF THE INVENTION
Now a dosage equipment provided with a peristaltic pump has been invented which includes a peristaltic pump with a detachable set of hoses in the form of a cassette with means for attaching the set of hoses. The means of attaching comprise attachment pieces or elements provided on the set of hoses and corresponding which cooperate with attachment means provided on the body of the pump. Further, the dosage equipment includes a carriage displaceable relative the peristaltic pump, the liquid being dosed into the vessels provided on the said carriage. The attaching means are preferably so-called fast-coupling or locking means.
The ends of the attachment pieces for the hoses comprising the cassette are preferably interconnected by means of an unstretchable means, such as yarn or filament in order to prevent detrimental tensioning of the hoses similar to a hinge.
According to an embodiment, the end portions of the cassette supporting the set of hoses is provided with locking means e.g., cams pointing at the hoses, and the fastening piece or means on the body is provided with a locking groove for lockingly engaging said cams.
The tension of the hoses should preferably be made adjustable, and most appropriately so that the tension of each hose can be adjusted individually.
BRIEF DESCRIPTION OF THE INVENTION
An embodiment of the invention will be illustrated in more detail with the aid of the accompanying drawings, wherein
FIG. 1 is a schematical front view of the whole apparatus partly in section,
FIG. 2 shows section A--A in FIG. 1 as enlarged,
FIG. 3 is a partial sectional view B--B in FIG. 2 without showing the cassette of hoses,
FIG. 4 shows a detached cassette of hoses for the apparatus,
and FIG. 5 shows the section C--C in FIG. 4.
DESCRIPTION OF A PREFERRED EMBODIMENT
The main parts of the apparatus are the stationary part 2 of the peristaltic pump, the detachable hose cassette 3 of the pump comprising two cooperatively associated pieces 18, 19, the displaceable vessel carriage 4 with its conveyor means 38, a built-in steering equipment 5, and a control equipment 6, all of them fitted in a frame 1.
The peristaltic pump includes a rotor, which consists of a rotor shaft 7 as well as of readily revolving journalled shafts 10 fitted outside the rotor shaft 7 axially between end flanges 8 and 9 (FIGS. 2 and 3). The rotor shaft 7 is rotated by means of a stepping motor 11. The other end of the rotor shaft 7 is journalled in the body piece 12 of the pump.
The body piece 12 further includes a counter-piece 13, attached to the frame side of the rotor (FIG. 3), for fastening the hose cassette. The counter-piece has a plane upper face 14 and a plane lower face 15 about which upper and lower pieces 18 and 19 are cooperatively fitted, the counterpiece 13 having a locking groove 16 opening perpendicularly away from the rotor shaft for releasably receiving cams 24, 30 of elements 19 and 18, respectively.
The hose cassette includes three hoses 17 made of an elastic material, which are attached to the upper piece 18 and to the lower piece 19 so that the hose portions can be tensioned as a loop 17A around journalled shafts 10 and between the said pieces.
On the lower piece 19, the ends of the hoses 17 are att
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patent: 4685902 (1987-08-01), Edwards et al.
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Heinonen Mauno
Koivisto Juha
Priha Matti
Tervamaki Jukka
Jacyna Casey
Labsystems Oy
Recla Henry J.
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