Lubrication – Systems – With measuring or metering value system
Patent
1996-08-13
1997-11-18
Denion, Thomas E.
Lubrication
Systems
With measuring or metering value system
13762414, F16N 2700
Patent
active
056878150
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/ F195/00066 filed Feb. 14, 1995.
BACKGROUND OF THE INVENTION
The invention relates to an arrangement in connection with a lubricant dispenser comprising a frame, which frame contains a metering cylinder and a metering piston moving axially therein as well as means for conducting lubricant alternately to both sides of the metering piston, the means for conducting lubricant comprising a spindle positioned in the cylinder and provided with passages remaining entirely open during the whole pressurization, the spindle being arranged to move in the cylinder so as to permit flow of lubricant in consequence of a movement of the spindle alternately either via a control valve to one side or the other of the metering piston or directly to one side or the other of the metering piston, depending on dispenser, whereby the spindle is arranged to move Only by rotating around its longitudinal symmetry axis.
It is previously well-known in the field to lubricate several objects of lubrication from a common fixed lubricant source. In such a centralized lubricating system, a required number of dispensers are mounted in the vicinity of the objects of lubrication, one dispenser usually attending to two objects of lubrication. The dispensers are connected with pipes to a pump feeding lubricant at intervals determined by a control center to the dispensers metering a desired quantity of lubricant and pressing that quantity of lubricant to the object to be lubricated. A control valve in the dispenser conducts the lubricant metered by the metering piston to each object of lubrication alternately.
Most of the previously known centralized lubricating systems are two-pipe systems, in which the dispensers are connected to the pump always with two main pipes through which lubricant is fed into each dispenser alternately. Movements of the control valve, which are necessary for conducting a quantity of lubricant alternately to different objects of lubrication, then occur influenced by an alternate pressurization of the main pipes in such a way that the pressure of one main pipe pushes the control valve to another position and the pressure of the other main pipe pushes the control valve back. A drawback of such a system is that two pipes have to be mounted between the pump and the dispensers. Such a double piping is, however, expensive and increases the mounting work.
To eliminate the above drawback, dispensers connectable to a pump by means of one manifold have been developed, through which the drawbacks of double piping can be removed. As an example of such dispensers and arrangements can be mentioned a solution disclosed in the Finnish Patent 66 978. A drawback of this solution is, however, that it is not very well adapted to all lubricants. Inconveniences may occur with difficult greases, i.e. greases in which oil and soap tend to be separated from each other. Another drawback is an underpressure on one side of the dispenser caused by a difference in the surface area of the control valve, for instance.
To eliminate the above drawbacks, a solution disclosed in-the Finnish Patent Application 912 786 has been developed. This solution functions in most situations completely faultlessly. In some situations, however, a drawback is that hardening and surface treatment of spindle material cannot always be performed in the best possible manner. The reason is that a compromise has to be done at the manufacture of the spindle, as far as moving and valve properties are concerned, due to which the final result is not necessarily the best possible in all situations.
SUMMARY OF THE INVENTION
The object of the invention is to provide an arrangement by means of which the drawbacks of the previously known solutions can be eliminated. This has been achieved by means of the arrangement according to the invention, which is characterized in that the rotary movement of the spindle is arranged to be provided by means of a separate turning part moving back and forth and rotating influenced by
REFERENCES:
patent: 2126451 (1938-08-01), Creveling
patent: 3172578 (1965-03-01), Kemp
patent: 4632361 (1986-12-01), Callison
patent: 5147016 (1992-09-01), Antila
Antila Kari
Lehtinen Ismo
Denion Thomas E.
Safematic Oy
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