Cutting – Rotatable disc tool pair or tool and carrier – Means to separate elements of tool pair
Patent
1991-01-08
1994-11-01
Seidel, Richard K.
Cutting
Rotatable disc tool pair or tool and carrier
Means to separate elements of tool pair
83506, 835081, 835083, 83563, 836391, 83676, 92177, B26F 108
Patent
active
053599160
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a perforator with a perforating disk rotatably seated in a U-shaped bearing bracket. The bearing bracket is moved into and out of the path of movement of a piece to be perforated by a piston-cylinder unit which can be actuated from either side. The piston-cylinder unit is housed in a fastening element which can be connected to a machine frame by guide bolts movably disposed in the bearing bracket which maintain the bearing bracket fixed against rotation in respect to the fastening element.
2. Description of Prior Art
A perforator of this type is disclosed in German Patent DE-PS 34 39 199. As disclosed therein, the fastening element is an open tray, the bottom of which is oriented towards the bearing bracket and which is closed on the side away from the bearing bracket by a cover. A commercially available piston-cylinder unit is used for displacing the bearing bracket with the perforating disk, which consists of a piston with a piston rod housed in a cylinder housing. This piston-cylinder unit is housed in the tray-shaped fastening element. Therefore the guide bolts for the bearing brackets must have a distance larger than the sum of the diameter of the cylinder housing and the diameter of the guide bushings for the bearing bracket. This establishes a minimum size for the perforator.
An object of the invention is to simplify the structure of a perforator of the previously mentioned type and to reduce the size of the perforator in the process.
This object is attained in accordance with the invention where a quadrate fastening element in the form of a cylinder has a blind bore extending from the side facing a bearing bracket, in which a piston, which is provided with seal rings, is sealingly guided in a displaceable manner. The blind bore is closed by means of a seal bushing through which extends a piston rod connected to a piston, which piston is connected to the bearing bracket. The blind bore transforms on the side facing the bearing block into an end section with a larger diameter forming a shoulder against which the seal bushing rests. In another embodiment the cylinder as a fastening element is plate-shaped and oriented to the plane of the perforating disk. A plate-shaped piston is displaceably guided in a quadrate sealed recess of the cylinder and is fixedly connected with the bearing bracket by a sealed piston rod displaceably guided in the cylinder. Both sides of the piston which extend crosswise to the displacement direction of the piston are provided with sealing elements which seal on all sides in the direction of the recess of the cylinder.
In this embodiment the fastening element forms the cylinder housing of the piston-cylinder unit and does not require a cover. It is possible to reduce the length of the two guide bolts of the bearing bracket so that the structural height of the perforator as a whole is reduced. The determining dimension for the length of the guide bolts in this embodiment is the diameter of the blind bore, which corresponds to the interior diameter of the cylinder housing of the known perforator, or the dimension of the quadrate recess in the fastening element as well as the diameter of the guide bushings of the guide bolts of the bearing bracket.
In accordance with an embodiment of this invention the seal bushing is fixed by a retaining ring in the end section of the blind bore and is maintained in contact with the shoulder, limiting the displacement path of the piston and providing the piston rod with additional guidance.
An absolutely straight guidance of the bearing bracket is attained where the guide bolts of the bearing bracket are guided in guide bushings, which are inserted into bores of the quadrate fastening element and are immovably held in the bores at both ends by retaining rings. The installation of the guide bushings is made easier and improved where the bores only extend over part of the thickness of the quadrate fastening element and, on the side facing away from the bearing bracke
REFERENCES:
patent: 2997906 (1961-08-01), Burk et al.
patent: 3564962 (1971-02-01), Wingen
patent: 3892156 (1975-07-01), Johnstone
patent: 3977284 (1976-08-01), Mastriani et al.
patent: 4080877 (1978-03-01), de Fries
patent: 4561335 (1985-12-01), Wingen
patent: 4623420 (1986-11-01), Hinkley
patent: 4678457 (1987-07-01), Slobodkin
patent: 4741234 (1988-05-01), Colombo
English Translation of German patent No. 3,439,199 C1 to Werner Bonnet published Feb. 20, 1986.
Seidel Richard K.
Woods Raymond D.
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