Expansible chamber devices – Moving cylinder
Patent
1982-05-17
1984-06-12
Maslousky, Paul E.
Expansible chamber devices
Moving cylinder
92140, 74520, F01B 1502
Patent
active
044534558
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a force amplifying displacement device.
More particularly, the invention concerns a displacement device, where a major part of the displacement movement requires only a minor force or no force at all (transportation movement), while a short part of the movement requires a substantially greater force. Example of such devices are machine tools, where a press head, a piercing tool, a deep-drawing tool or some other member is to be moved back and forth towards an opposite tool half, a die or the like. Here the major part of the movement hardly needs any force at all, while a substantial material deforming work is effected along a short distance and therefore entails the application of a very great force.
In order to generate such great forces, operating units such as pneumatic or hydraulic operating cylinders are often used, which are dimensioned for a specific stroke (the entire displacement distance) and a maximum force. This, however, involves a considerable over-dimensioning, since the capacity of the operating unit is used only for a very short part of the operating stroke.
The object of the invention is thus to achieve such a displacement device that a smaller operating unit can be used owing to force amplification along a part of the displacement movement.
According to the invention this object is achieved by means of a special lever mechanism and its connection to the rest of the device.
The most important advantage gained from the invention is that substantially smaller units can be used, making the device cheaper and lighter than previously knwon structures.
The invention is described further below with reference to the appended drawings illustrating an embodiment.
FIG. 1 shows schematically in side elevation a machine frame and a displacement device according to the invention;
FIG. 2 shows, in a larger scale, the upper portion of the device according to FIG. 1 during a first part of the displacement movement;
FIG. 3 shows, likewise in a larger scale, the upper portion of the device according to FIG. 1 during the final stage of the displacement movement; and
FIG. 4 shows, also in a larger scale, the displacement device in its entirety in a self-locking end position.
The displacement device 1 shown in FIG. 1 is mounted on a machine frame 2 above an operating table 3. In the present example, the device is used for a sealed closure of a container 4 by means of a lid 5 carried by the displacement device, wherein the sealing is achieved by means of a sealing ring 6 of an elastomer material (compare also FIG. 4). Only along a very short part of the closing movement, a great force needs to be applied, i.e. when an acceptable sealing function is to be achieved by deformation of the sealing ring 6, so that a tight all-round contact is secured. Such a closing operation can be used e.g. for testing the tightness of the container, which is supplied with vaccuum or over-pressure during a predetermined time period via a hose connection (not shown).
For the stated purpose - to accomplish a relatively long displacement movement with an insignificant force and a relatively short displacement movement with a great force - the device 1 comprises a power transmission rod 7 being linearly guided in a vertical tube portion 8 fixed to the machine frame, an operating unit 9 consisting of a pneumatic cylinder 10, a piston 11 displaceable therein, a protruding piston rod 12 and non-illustrated connection hoses for the pneumatic operation of the unit 9, as well as a force amplifying, conditionally operating lever mechanism 13.
The tube portion 8 is welded between two bracket plates 14, 15 (of which only one is visible in the side views in the figures) and is at the top and the bottom provided with internal slide bearings 16 (the upper one is shown in FIGS. 2, 3 and 4). Furthermore, between the bracket plates two stationary axes 17 and 18, respectively, included in the lever mechanism 13, are secured.
The power transmission rod 7, thus, is linearly guided in the slide bearings of the tube portion 8 and
REFERENCES:
patent: 371049 (1887-10-01), Fitts
patent: 3732784 (1973-05-01), Vogelei et al.
patent: 4133260 (1979-01-01), Gundal
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