Pumps – Expansible chamber type – Elongated flexible chamber wall progressively deformed
Patent
1994-10-28
1996-09-24
Thorpe, Timothy S.
Pumps
Expansible chamber type
Elongated flexible chamber wall progressively deformed
74567, 2988822, F04B 4308
Patent
active
055585078
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a hose pump with pushers arranged one behind the other in the direction of extension of the hose, the edges of which act in rhythmic alternation on the hose and which are controlled by angularly staggered disks which rotate about a common axis.
A hose pump of this type is known from Federal Republic of Germany OS 25 43 300. The rhythmically controlled pushers act as squeezing means. By a suitably wave-shaped structure, they gently press out the amount which has been precisely separated from the remaining supply. The entire unit is based on the precise development and association of the eccentric disks to each other. The eccentric disks are drilled through eccentrically. The holes created in this manner receive a shaft which passes through all the disks. The securing for rotation is obtained by connecting pins which lie on the side and extend over the gap between the eccentric disks. Two radially equally spaced apart openings of corresponding cross section are produced in each eccentric disk. The stacked position of the eccentric disks is secured by threaded sockets at the ends, i.e. by support shoulders formed by them.
SUMMARY OF THE INVENTION
The object of the present invention is to simplify the construction of the central control element of such a hose pump, namely the so-called eccentric shaft, with a reduction of the individual parts without reducing the desired precision, and this while obtaining a basic concept which is favorable for assembly.
According to the invention the common axis (x--x) is made up of stub shafts (8) which project on one side (a) of an eccentric disk (7) and engage in corresponding recesses (9) in the adjacent eccentric disk (7).
As a result of this development, a hose pump of this type which is of simplified structural shape is obtained. The precision rotating part consisting of the shaft is eliminated. The forming of the shaft is taken over by the eccentric disks. In this way, by addition of the eccentric disks, the final length required in each case is also obtained; no shafts of different length need by kept ready. Specifically, in this connection the common shaft is formed by stub shafts each of which protrudes from the one side of an eccentric disk and engage in corresponding recesses in the adjacent eccentric disk. In this way, due to the position of the eccentric disks one above the other, a load-bearing support side against side is obtained; no tilting takes place; even with stacks of longer length, the individual pieces which add to each other to form the geometrical axis are satisfactorily coaxial. Furthermore, there is no loss of material, since the accumulation of material which creates the stub shaft is obtained substantially from the volume of the recess. Consistent with this, the stub shafts are integral with the eccentric disks, which may suitably even consist of plastic. This can be achieved by injection molding with the use of plastic of high crystallinity, the stub shafts being furthermore adjacent to insertion pins which are also formed from the same part and engage in holes in adjacent eccentric disks so as to fix the angularly staggered arrangement of the eccentric disks. With regard to the sparing use of material, reference is had to what has been stated above. On the other hand, in the event that larger loads are to be expected on the eccentric disks, shearing can easily be counteracted by the use of two or more insertion pins and corresponding holes. In order, for instance, to counteract unfavorable tolerance pairings of the eccentric disks which are connected by insertion pins with each other, it is furthermore proposed that the protrusion of the stub shafts be less than the depth of the recesses which receive them. This is similarly true also of the insertion pins and holes. In this way, any burrs become without effect. A flat application of the eccentric disks side against side is in this way assured. From the standpoint of the supporting, an advantageous development of the e
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Korytnyk Peter G.
Mastermark Corporation
Thorpe Timothy S.
LandOfFree
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