Expansible chamber devices – With inspection window in expansible chamber wall portion – With lock
Patent
1992-12-07
1994-04-26
Denion, Thomas E.
Expansible chamber devices
With inspection window in expansible chamber wall portion
With lock
92 135, 92 85B, 92128, 92165R, 92165PR, F01B 2526
Patent
active
053056833
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is based on a pressure-medium actuated linear unit.
2. Background Information
In the case of a familiar linear unit (EP-B1 017 779), the drive unit is located in a housing block which is equipped with end flanges at both end faces, in which the guide elements for the piston rod and the guide rod are accommodated. This design necessitates that the guide rod and the piston rod must be guided out of the housing block on both sides. This arrangement makes it impossible for the linear unit to be designed as a compact unit.
In the case of another familiar linear unit (EP-A1 309 613), the guide elements for the piston rods and the guide rods, as well as the pressure medium drive, are integrated in a uniform housing block. For the various areas of application, linear units with differing stroke lengths are required. For the purpose of realising the various stroke lengths, apart from the guide rods and pistons rods, the length of the housing block must also be varied. Thus for the various stroke lengths, requiring high production depth, only small batch production is possible.
SUMMARY OF THE INVENTION
In contrast, the linear unit in accordance with this invention, with the characterising features of the main claim, has the advantage that a compact modular construction is possible. A further advantage is the fact that all significant function elements which require a high production depth are integrated into the guide unit, by which means the manufacturing batch size can be increased.
Through the measures listed in the dependent claims, further advantageous developments of the linear unit described in the main claim are possible. It is particularly advantageous to employ a constant length for all stroke lengths of the guide unit. A further advantage is in the manufacture of the guide unit and the drive unit from one extruded profile, with the extruded sections respectively containing the passages for the piston rod and the guide rod. It is furthermore expedient if the extruded part of the drive unit contains a further hole as a pressure medium path. A design which is advantageous for a compact construction consists of the fact that two guide rods are provided, which are connected with one another in the region of the drive unit by means of a connecting element. A further expedient design form consists in the drive unit being equipped with end position switches which are damped by a surface which is connected to the guide rod.
BRIEF DESCRIPTION OF THE DRAWINGS
A design example of the invention is represented in the drawings, and explained in further detail in the following description.
FIG. 1 shows a longitudinal section through a linear unit in accordance with the invention;
FIG. 2 shows a cross-section through II--II of the extruded profile of the drive unit, according to FIG. 1; and
FIG. 3 shows a cross-section through III--III of the extruded profile of the guide unit, according to FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The linear unit represented in FIG. 1 consists of a guide unit 10, a drive unit 11, a piston rod 12, two guide rods 14, and an operating cylinder 15 in which a piston 13 is guided which is connected to the piston rod 12. The ends of the piston rod 12 and the ends of the two motion guide rods 14, which project from the guide unit 10, are fixed to a common operating yoke 22. The further structural elements of the linear unit, such as for example a gripper device, are fitted on the operating yoke 22.
The housing block of the guide unit 10 and of the drive unit 11 are each manufactured from an extruded section 50 or 60 (FIG. 2 and FIG. 3). The extruded section 50 (FIG. 3) of the guide unit 10 has various cavities 40 to 44. Here, cavity 42 serves for the passage of the piston rods 12, and the cavities 43 and 44 respectively serve for the passage of the two guide rods 14. The drive unit housing 11 likewise has a cavity 45, which is arranged in alignment with cavity 42 of the guide unit 10. Profile 60 (FIG. 2
REFERENCES:
patent: 2442306 (1948-05-01), McCormic
patent: 3272132 (1966-09-01), Stoelting et al.
patent: 4351628 (1982-09-01), Drexel et al.
patent: 4555979 (1985-12-01), Cetnarowski
patent: 4682535 (1987-07-01), Stoll
patent: 4736675 (1988-04-01), Stoll
patent: 4939983 (1990-07-01), Lipinski
Tol-O-Matic Sales Brochure p. 10 Dec. 1985.
Fluid, 1988, No. 1-2, p. 56, Jan. 1988.
Gosdowski Gerhard
Neuwirth Josef
Denion Thomas E.
Robert & Bosch GmbH
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