Lubrication – Systems – With measuring or metering value system
Patent
1997-10-15
2000-01-11
Graysay, Tamara
Lubrication
Systems
With measuring or metering value system
1841052, 200517, 2003022, F16N 714
Patent
active
060125519
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The invention concerns an apparatus for automatic lubricant delivery, comprising a piston arranged in a cylinder, and a drive means connected thereto.
2. Description of the Prior Art
Such an apparatus is known from German patent specification No 43 21 452 or DE-U-92 14 096. While German patent specification No 43 21 452 proposes a construction in which lubricant is directly pressed out of the cylinder by means of a pressure piston and therefore the lubricant is disposed directly in the cylinder itself, the construction of DE-U-92 14 096 proposes fitting a lubricant pack or cartridge into the cylinder and expelling it by means of a piston. The two known constructions suffer from a number of disadvantages. Thus the disadvantage of the construction disclosed in German patent specification No 43 21 452 is in particular that, when the lubricant is urged out of the cylinder, the piston is subjected to very different loadings because of its geometrical shape and has a tendency to tip away slightly at the outer edge which is opposite the inside wall surface of the cylinder, or to form a gap between the piston and the inside wall surface of the cylinder, through which gap lubricant can pass into the region of the drive. The measures proposed in that publication for sealing the gap between the piston and the inside wall surface of the cylinder are at any event completely inadequate. Furthermore the lubricant dispenser is only activated by setting the dispensing time with a graduation at the desired time intervals, by electronic control, which is disadvantageous in particular when the lubricant dispenser is disposed at locations which are only accessible with difficulty and which scarcely permit setting of the dispensing time. Furthermore the design configuration of the means for setting the dispensing time in the apparatus is not very economical by virtue of the frequent one-off use thereof.
In the lubricant dispenser known from DE-U-92 14 096.3, admittedly no sealing problem is involved by virtue of the lubricant being disposed in a lubricant pack or cartridge, but the lubricant pack of cartridge cannot be completely emptied as the piston is of a stepped configuration in cross-section and the lubricant pack or cartridge cannot in principle be entirely emptied. Thus residues always remain behind in the lubricant pack or cartridge so that this arrangement only affords less than optimum utilization of the entire amount of lubricant in the lubricant pack or cartridge. Furthermore, in the case of the known lubricant dispenser, it is possible for them to give rise to explosions under adverse environmental conditions.
The object of the present invention, in an apparatus for automatic lubricant delivery, comprising a piston disposed in a cylinder and a drive connected thereto, is to avoid the disadvantages from which the state of the art suffers.
In accordance with the invention that is achieved with an apparatus for automatic lubricant delivery, as set forth in claim 1. Advantageous developments of the invention are recited in the appendant claims.
It is highly advantageous if the apparatus according to the invention has an on switch or circuit closer switch which is protected in relation to spray or splash water and which complies with international standard ID 65. Spray water protection is achieved by a suitable sealing arrangement for the on switch, whereby at the same time the entire apparatus for automatic lubricant delivery is protected against explosion. After activation of the on switch, the apparatus can only be switched off by cutting off the power supply. The preferred relinquishment of a switch-off function does not cause any problems because the automatic lubricant dispenser virtually never has to be switched off, but, by virtue of a preset lubricant delivery amount per day or other unit of time, remains in operation until all lubricant has been discharged from the cylinder.
The on switch or circuit closer switch is preferably in the form of a cylindrical pin co
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274 Betriebstechnik, 32, Dec. 1991, No. 12, Grafelfing, DE "Sicher und sparsam", p. 22.
Gerhard Dohring
Graysay Tamara
Kim Chong H.
LandOfFree
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