Lubrication – Lubricators – Refilling device
Reexamination Certificate
1999-09-20
2002-10-22
Kim, Chong H. (Department: 3682)
Lubrication
Lubricators
Refilling device
C184S028000, C222S327000, C222S388000
Reexamination Certificate
active
06467579
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a press for extruding lubricating grease, with a press head with a high-pressure reciprocating pump, a high-pressure outlet opening with check valve, a low-pressure intake opening for feeding to the reciprocating pump the mass to be extruded, a device for actuating the pump piston of the reciprocating pump, and a connection on the press head for connecting a pipe to the press head, the pipe containing a lubricating grease filled, cylindrically shaped cartridge with a displaceable trailing piston.
Such a press, in the form of a hand lever press, is known from DE-A-22 14 652. There, the rigid cartridge displays, in the region of its end facing the press head, a circular bead that is clamped between the pipe screwed into the press head and the press head. The bottom of the cartridge, displaying the outlet opening for the viscous mass, is formed in a convex manner, so that its ring edge abuts the press head. Between the bead of the cartridge and the press head is designed a seal, which is likewise intended to prevent the viscous mass from reaching the ring gap formed between the cartridge and the pipe. The end of the pipe turned away from the press head is formed open, so that the position of the trailing piston lodged displaceably in the pipe, and thus the fill level of the cartridge, can be perceived from outside through the opening. The diameter of the opening in the pipe is dimensioned smaller than the outer diameter of the cartridge. To replace a cartridge, it is thus necessary to unscrew the pipe form the press head, insert a new cartridge with bead from the side of the pipe turned away from the press head, and again screw the pipe onto the press head.
The designs of the lever press and of the cartridge to be found in connection with this application have various disadvantages. Thus, it is quite time-consuming to replace the cartridge, because the press head and the pipe must be separated. Furthermore, provision must be made for sealing means between cartridge and press head or pipe. The cartridge is costly to make, since it is not designed as a component with constant inner and outer diameters, but rather displays a bead. The contents of the cartridge, i.e., the type of lubricating grease, is not recognizable from the outside, since indications as to the lubricating grease located in a particular cartridge are not, as a rule, present in the bottom region of the cylinder section of the cartridge.
Known from U.S. Pat. No. 5, 044, 471 is a hand lever press for extruding lubricating grease. There, instead of a cylindrical cylinder, a bellows cartridge is used. This has, among others, the disadvantage that it does not permit a complete and clean emptying. Clamped between the press head and a pipe screwed into this is an attachment element, which displays a connection for the screwing in of the bellows cartridge. The pipe that surrounds the bellows cartridge is closed in the region of its end turned away from the press head and inside the pipe is arranged a compression spring, which is effective between this end and a piston that impinges upon the bellows cartridge. With increasing emptying, the bellows cartridge is compressed. The fill level of the bellows cartridge inserted into the pipe cannot be perceived from outside. To replace the bellows cartridge, the pipe must be unscrewed from the press head.
Known from GB-A 2 273 745 is likewise a hand lever press for extruding lubricating grease in which a bellows cartridge finds application. This bellows cartridge is screwed directly into the press head in the region of the outlet connection piece of the cartridge and is surrounded by a pipe that is likewise screwed into the press head. The pipe is formed open in the region of its end turned away from the press head. The bellows cartridge is located completely inside the space enclosed by the pipe, so that it is protected against damage from outside during use of the press. In order to enable the fill level of the bellows cartridge to be ascertained, the pipe is provided on its side with a slot that extends in the longitudinal direction of the pipe over a part of its length. According to the fill level of the bellows cartridge and thus to the greater spacing of the circumferential bellows edges when the cartridge is full, or, on the other hand, to the lesser spacing of these bellows edges in the partially or completely empty state, the approximate fill level of the bellows cartridge can be perceived through the slot. Since the bellows cartridge collapses with increasing emptying, for its replacement it is necessary to unscrew the pipe from the press head.
Under the type designation MATO DF 500, a pneumatic one-hand press of the firm MATO Machinen-und Metallwarenfabrik Curt Matthaei GmbH & Co. K G, Mühlheim, has become known. This displays a main body that is formed in essence by the pressure unit and the press head. Here, the cartridge, after its sealing cap has been removed, is screwed, together with the grease-pressing cylinder, into the press head. Furthermore, pneumatic presses for lubricating grease are known from DE-A-35 27 925.
A dispenser for issuing pasty masses, for example toothpaste, is known from DE-A 40 13 705. In this dispenser, a cylindrical cartridge with a base is used, which cartridge completes a housing that displays a conveying device, arranged in a head piece, for proportioned issuing of the mass from a mouth piece, under the step-by-step advance of a trailing piston arranged in the cartridge. The cartridge is introduced through the lower opening of the housing into a pipe-shaped section of the housing and the cartridge, along with its socket displaying an outer thread, is screwed into a central housing floor, whereby an annular collar forming the base of the cartridge contacts the housing on the face side. This is necessary so that a cylindrical wall of the cartridge is at the correct distance from a pump piston of the dispenser and the latter thus functions correctly. The dispenser standing open in the region of the cartridge is grasped by one hand on the outside in the region of the housing and an actuating handle integrated in the head piece is pressed by one of the fingers of this hand. With this dispenser the cartridge is guided radially by the pipe-shaped section of the housing and the socket is held axially in the central housing floor. The cartridge is fixed through the contacting of its annular collar on the face side at the housing in the region of the lower opening of the housing.
From DE-A-39 24 926 is known a device for applying fluid, for example a cosmetic fluid, ink, dye, or a liquid pharmaceutical. The fluid is located in a cartridge that is inserted into a shaft and projects out of this in the rear. When the cartridge is moved in the longitudinal direction relative to the shaft, the cartridge moves together with a valve unit that works with it; the valve unit issues the fluid, for example onto a brush.
SUMMARY OF THE INVENTION
The task of the invention is to further develop a press of the type given in the introduction, in such a manner that cartridges used in it can be exchanged quickly and easily. With this device, the fill level of the cartridge should be perceivable, as well as the type and/or manufacturer of the lubricating grease located inside the cartridge. The sealing between cartridge and press should be ensured. The cartridge should be protected from damage from outside and, on account of the underlying conventional pressing-device type of construction, high stresses during use should be withstood.
The task is accomplished in a press of the type given in the introduction by the fact that provision is made for a cartridge-connecting element that is held between the press head and the pipe, the connecting element displaying a connection for the cartridge, and by the fact that the pipe is formed open in the region of its end turned away from the press head, the cartridge joined to the connecting element projecting from the open end of the pipe, guided by the pipe radially and is held
Kim Chong H.
MATO Maschinen-und Metallwarenfabrik Curt Matthaei GmbH & Co. KG
Price Heneveld Cooper DeWitt & Litton
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