Expansible chamber devices – With releasable stop or latch means to prevent movement of... – Includes interfitting parts engageable at plural positions...
Patent
1997-12-09
2000-12-26
Lopez, F. Daniel
Expansible chamber devices
With releasable stop or latch means to prevent movement of...
Includes interfitting parts engageable at plural positions...
92 28, 92 88, F15B 1526
Patent
active
061641855
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to brake means in linearly moving operating devices which is reciprocatingly movable along the device. More particularly, there is provided a brake means for a piston, compressed air cylinders, and the like.
BACKGROUND OF THE INVENTION
Linearly moving operating devices have a wide field of use. The term linearly moving operating device shall be understood to include pressure fluid cylinders that operate with compressible media, such as compressed air. Linearly moving operating devices shall also be understood to include hydraulic cylinders and so-called ball screws. In the case of the first-mentioned operating devices, i.e. devices that work with compressible media, serious difficulties are experienced in braking and holding the piston-rod in desired positions. By braking is meant both progressive retardation of the piston and abrupt braking or holding the piston stationary. Examples of different solutions for braking the movement of pressure cylinders, particularly pneumatically operated cylinders, are found described in Swedish Patent Specifications 465 530, 465 888 and 465 899. These solutions include the use of a bar or rail along which a slide guided by the rail and connected to the piston of the cylinder can be locked. The solutions proposed, however, are relatively complicated and therewith expensive to implement, and the locking force generated by such devices is much too low to ensure safety in vertical applications.
The present invention, as defined in the characterizing clauses of respective claims, provides brake means for, e.g., compressed air cylinders and corresponding linearly moving operating devices that is of simple construction and highly reliable in operation by virtue of the very significant locking force generated by said brake means.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to exemplifying embodiments thereof and also with reference to the accompanying drawings, in which
FIG. 1 is a sectional view of inventive brake means;
FIG. 2 is a cut-away perspective view of the brake means in a deactivated state; and
FIG. 3 is a schematic, part-sectioned view of the brake means taken on the line III--III in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1 and 2 illustrate brake means 1 mounted in a cylinder 2 which, in the illustrated case, does not have a piston rod but which instead includes a slot that extends along the length of the cylinder and that receives a dogging element 4 mounted on a reciprocatingly movable piston 3 on one side of the cylinder. The slot is typically sealed with the aid of a steel band. The cylinder may, of course, be of some other kind and forms no part of the present invention. The brake means 1 includes a bar 5 which is fitted to the cylinder 2 by means of a male and female connector means, indicated at 6, to form a unit with said cylinder. Formed in the top end of the bar 5 is a groove 7 which has the shape of an inverse T and which guidingly receives a slide shoe 8. The slide shoe 8 is connected to the dogging element 4 for movement together with said element upon activation of the piston 3. Extending along the length of the bar 5 is a hollow cavity 9 which accommodates a hose-like element 10. The cavity is open to a channel 11 which is vertical in the figure and the vertical extension of which is much greater than the vertical extension of the cavity 9 and the top of which is terminated by an essentially square-section guide groove 12. Inserted into the groove 12 is a square-section profile 13 that is able to move to a certain extent vertically in the guide groove 12. A steel band 14 is mounted in the bottom of the I-shaped groove 7. The bar 5 includes holes 15 in which pins 16 are disposed uniformly along the length of the bar, see FIG. 3. The channel 11 accommodates a slat spring 17, with the upper edge 18 of the spring located beneath the bottom side of the profile 13, and the bottom edge of the spring 17 resting on the bottom of
REFERENCES:
patent: 2200427 (1940-05-01), Merx
patent: 5111913 (1992-05-01), Granbom
patent: 5205204 (1993-04-01), Gottling et al.
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