Cutting – Means to drive or to guide tool – Guide
Reexamination Certificate
1998-07-10
2001-02-06
Rada, Rinaldi I. (Department: 3724)
Cutting
Means to drive or to guide tool
Guide
C384S030000
Reexamination Certificate
active
06182552
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a holding device for a cage for roll bodies of longitudinal leaders on guide pins or pillars of a tool, the tool comprising a plurality of plates put together and made up of at least a first part and a second part, in particular a blanking or punching die or a mould, in which the first part bears the pillars which are led in corresponding guides in the second part by means of roll bodies held in cages so that a working stroke can be achieved with the first part in relation to the second part, which holding device comprises in each case a holding part which consists of a rod held displaceably in a longitudinal bore made on the free end of the pillar, which rod is provided with a disk projecting beyond the circumference of the pillar, and whose displacement path is limited by stops.
In tools of this kind the first part, which bears the pillars, can be separated from a second part, which is provided with corresponding guides for receiving the pillars in which the pillars are led, for example, by means of ball bearings in cages. To ensure that the ball bearing cages remain at least partially fixed on the pillars, particularly when the first part can be lifted vertically out of the second part of the tool, holding devices are provided in a known way. With these devices the ball bearing cage is prevented from coming completely out of the pillar.
Usually this first tool part containing the pillars is put down on a base at least temporarily in such a way that one edge of the plate bearing the pillars and the end areas of the two pillars remote from the plate rest on this base. If the ball bearing cage projects far beyond the pillar, the cage can thus be damaged, especially when tilted or exposed to blows.
SUMMARY OF THE INVENTION
The object of the present invention is therefore to design the holding device in such a way that the cage for roll bodies can be pushed completely onto the pillar when the tool parts are separated, and can be kept in this position by the holding device. In addition, the cage should be able to be brought into the moved-out position again without any great effort, where it is once again held by the holding device, which is necessary for insertion of the respective pillars into the guides.
This object is achieved according to the invention by means of a retention element which holds the holding part in a releasable fashion in the position where it is pushed into the pillar.
The retention element preferably consists of an elastic element which is disposed in the longitudinal bore of the pillar. The rod can then be brought into the completely pushed-in position, which is achieved with a slight pressing. In this position the rod is held firmly by the elastic element in a clamping way. The holding part can be released from this holding position by pulling.
In a preferred embodiment of the holding device, the rod of the holding part is designed hollow cylindrical and a screw can be screwed into the longitudinal bore of the pillar, the head of which serves as a stop for an annular element provided inside the hollow cylindrical rod, and which sets the pulled-out position of the holding part. By suitable selection of the length of the screw, and depending upon how deeply the screw is screwed into the longitudinal bore, the stop setting the pulled-out position of the holding part can be adjusted.
The elastic element is preferably designed as a spring bushing which can be inserted into a recess provided in the region of the screw remote from the head. The annular element of the hollow cylindrical rod of the holding part can be pushed over this spring bushing until the pushed-in position is reached, a clamping hold being achieved. In this way a simple and optimal holding of the holding part in the pushed-in position can be ensured.
The disk of the holding part has preferably cut-outs, only the areas of the disk situated between the cut-outs protruding beyond the circumference of the respective pillar. Since the disk is rotatable with respect to the corresponding pillar about the longitudinal axis, the disk can be turned in such a way that a cutout of the disk is opposite the base when the respective tool part with the pillars is put down on a base. In this way it can be prevented that the weight of the tool part, upon tilting, is absorbed by the disk, thus damage to the disk can also be excluded.
REFERENCES:
patent: 3469894 (1969-09-01), Stamm
patent: 3763732 (1973-10-01), Stursberg
patent: 3847049 (1974-11-01), Bitzel
patent: 4947718 (1990-08-01), Whistler
patent: 4989484 (1991-02-01), Johnson et al.
patent: 4998958 (1991-03-01), Chun et al.
patent: 5044239 (1991-09-01), Endo et al.
patent: 5214991 (1993-06-01), Shimizu et al.
patent: 755988 (1952-05-01), None
patent: 2275976 (1976-01-01), None
Agathon AG Maschinenfabrik
Flores-Saánchez Omar
Pearne, Gordon, McCoy & Granger LLP
Rada Rinaldi I.
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