Expansible chamber devices – With guide or seal on cylinder end portion for piston or... – Additional guide is spaced chamber end wall
Patent
1989-06-30
1991-12-10
Look, Edward K.
Expansible chamber devices
With guide or seal on cylinder end portion for piston or...
Additional guide is spaced chamber end wall
92165R, 91232, 91233, 91235, F16J 1518
Patent
active
050707698
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic linear vibrator, comprising a piston guide sealed at least on one side and delimited by detachable end parts, a piston, a sound-absorbing pipe, and means for supplying and removing a gaseous or vaporized pressure medium, the relative motion between the guide with the end parts and the piston being effected by automatic alternating supply of the pressure medium to a working volume formed on one face of the piston.
A congeneric compressed-air vibrator with a reciprocatingly movable piston is known from German Offenlegungsschrift 3,031,049. This compressed-air vibrator has a housing which is made of a piece of light-metal section and has four ribs arranged in a cross shape. Arranged in two ribs are the compressed-air supply and compressed-air discharge; the two other ribs serve to accommodate fixing elements. This vibrator has proved successful in practice, but has the disadvantage that it is of relatively complicated construction and is therefor correspondingly expensive.
The object of the inventors is to create a linear vibrator having relative piston motion and consequently controlled, alternating supply of the pressure medium, which linear vibrator is simple to manufacture, requires little maintenance and can be used universally.
SUMMARY OF THE INVENTION
This object is achieved according to the invention by
a piston having a longitudinal axial bore which has an annular groove in the region of each of the ends or close to either side of the longitudinal median plane of the piston, which annular grooves are each connected to a face of the piston by at least two axisymmetric channels which run in the axial direction and are sealed off from the longitudinal axial bore of the piston, this face being the adjacent face when annular grooves are arranged in the region of the piston ends and the remote face when annular grooves are arranged in the region of the longitudinal median plane of the piston, and
a guide pipe for the supply of the pressure medium, which guide pipe is closed on one side, penetrates through the end parts and the longitudinal axial bore of the piston in a sealing manner, serves as a piston guide and has radially disposed axisymmetric outlet openings for the pressure medium which correspond to the annular grooves in the longitudinal axial bore of the piston.
The impressively simple construction of the linear vibrator according to the invention permits a slim, elongated shape which reveals its advantages in particular when the vibrator is used, for example, for sieves, conveying channels, compacting installations or for driving tools. Air is conveniently used as the pressure medium, but exhaust gases or steam, for example, can also be used.
The external dimensions of the linear vibrator can be varied as desired depending on the intended use. The piston can have, for example, a length of 10-20 cm and a diameter of 1.5-5 cm, in which case the longitudinal axial bore can have a lumen of 25-50% of the outside diameter of the piston. The annular grooves, conveniently 1-3 mm deep, can, for example, be at a distance of 1-3 cm from the faces of the piston or from its longitudinal median plane.
As usual in pneumatic vibrators, the stroke of the piston is only a few centimeters. The frequency of the piston, moving in a reciprocating manner, is primarily dependent on the pressure of the supplied medium, the stroke and the weight of the piston, and also the coefficient of friction of the sliding surfaces.
The linear vibrator is conveniently fed directly from the compressed-air network, which normally has a pressure of 6-8 bar.
The frequency of the pneumatic linear vibrator having a piston movable in a reciprocating manner can be increased by material being removed axisymmetrically from the piston, but the control of the alternating compressed-air supply to the working volumes must not be disturbed.
The drive of the pneumatic linear vibrator by means of an alternating supply of the pressure medium is preferably effected via at leas
REFERENCES:
patent: 2748750 (1956-06-01), Altschuler
patent: 2887989 (1959-05-01), Dulaney
patent: 2917025 (1959-12-01), Dulaney
patent: 3045768 (1962-07-01), Huffman
patent: 3736843 (1973-06-01), Leibundgut
patent: 4194435 (1980-03-01), Gaun et al.
patent: 4303002 (1981-12-01), Maslakov et al.
patent: 4351225 (1982-09-01), Brandenberg et al.
Denion Thomas
Look Edward K.
LandOfFree
Pneumatic linear vibrator does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pneumatic linear vibrator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pneumatic linear vibrator will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1032800