Work holders – Relatively movable jaws – Means to actuate jaw
Patent
1985-10-21
1988-02-09
Schmidt, Frederick R.
Work holders
Relatively movable jaws
Means to actuate jaw
269902, B25B 110
Patent
active
047237716
DESCRIPTION:
BRIEF SUMMARY
We know fixing guiding toolings for round parts which are usually comprised of a prismatic flange bearing against the upper section of the part to tighten, using a union bow which covers the supporting levels of the part. These toolings exhibit the following disadvantages: (1) They do not allow fixing small diameter parts further to a preliminary contact of the flange on the supporting levels before the flange can touch the upper section of the part. (2) Screwing into the flange according to the tightening of very different diameters takes up relatively long. (3) A tightening flange covering the upper section of the part to tighten does not make it accessible over its whole length. (4) An additional device to transform it, for example into a drilling jig, does not exist. To this end, the fixing and guiding tooling is laid out as defined by the patent claims 1 and 4.
A version of the tooling subject to the said invention will be described on the enclosed drawing, as an example, the FIG. 1 showing an axial section and the FIG. 2 a view from above a fixing tooling for round parts, the figure 3 an axial section and the FIG. 4 a view from underneath a guiding tooling for round parts. This description, starting from the fixing tooling on its own, is comprised of a base 12 (FIG. 1) fitted with two inclined planes 1 and 2 carrying the part to tighten 13, a cylindrical aperture 7 inside which the swivelled nut 4 can slide quite freely. The nut 4 is assembled with a tightening screw 5 which has a spherical end to lean against the wall of the aperture 7 which is closest to the plane 1 (FIGS. 1 and 2). The screw 5 bears an arm 6 sliding freely inside a cylinder 14 recessed in the axle of the screw 5. The assembly formed by the arm 6 and its dependent tightening block 3 collides through the relief 15 inside the base 12 between its upper edge and a section opened over the whole length of the surface of the inclined plane 1 corresponding (FIGS. 1 and 2). Moreover, two clearance holes are drilled through 26 and 27 into the body of the base 12, fitted with a counterbore similar to 28.
The operation is as follows: when you want to lock a round part such as 13, but which can also have a smaller or larger diameter inscribable in the triangle constituted by the complete section limited by the inclined planes 1 and 2 inside the base 12, this very lock being necessary to carry out operations such as tack welding, drilling, milling, grinding, control of the surface or of the inside of the parts, you will communicate a motion of rotation to the right of the right-threaded screw 5, this motion brings the screw 5 towards the inclined plane 1 since the nut 4 cannot turn around. Before the screw 5 moving towards the relief 15, the axis of the nut 4 carrying this screw will be almost the same as that of the aperture 7, in this position, not illustrated, the block 3, bearing upon the part 13, has a face 16 forming an angle with the plane 1 smaller than in the position illustrated. As soon as the spherical end of the rotating screw 5 reaches the lateral surface of the guiding aperture 7 (FIG. 1), the lateral surface of the nut 4 does not coincide any more with that of the aperture 7 but is now in the slanting position illustrated which brings about the tilting-over of the arm 6 carrying the block 3 maintaining the part 13 between the lanes 1 and 2 as well as its contact face with the part; furthermore, the block 3 slides along the plane 1 moving its arm inside the cylinder 14. The part 13 is then locked. To loosen the part 13, you just need to turn the screw 5 in the other direction. To tighten a part of a different size, you have to displace the tightening 3 to bring it slightly against the part along its supporting plane while sliding the nut 4 through the aperture 7, then you proceed in the same way as in the example described for the part 13. The part to lock could also be conical; in this case, the block 3 will bear against the conical surface while rotating together with its arm 6 around its very axis. For practical reasons, longit
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patent: 2024112 (1935-12-01), Phillis
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patent: 2364150 (1944-12-01), Lowenstein
patent: 2455024 (1948-11-01), Schneider
patent: 2823564 (1958-02-01), Lentino et al.
patent: 3218059 (1965-11-01), Andrew
patent: 3971552 (1976-07-01), Mayfield
Hartman Judy J.
Schmidt Frederick R.
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