Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support
Patent
1993-04-14
1994-12-13
Bishop, Steven C.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
403349, 408241B, B23B 4902
Patent
active
053724640
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for locking and automatically fixing tooling on a support and particularly, but not exclusively, intended for mounting a pneumatic drill on a drilling jig.
When it is necessary to drill a large number of holes with each of them being very accurately positioned, e.g. in aviation, a known technique consists in using a drilling jig which accurately defines the positions of the holes to be made.
To this end, it is known to fix tooling to the jig so that the operation to be performed can be achieved without relative displacement between the tooling and the part to be drilled. Until now, such fixing has generally been manual in that it requires rotation of the assembly that is to be locked. An object of the present invention is to provide a fixing device that enables tooling to be fixed rigidly and automatically without any motion other than translation.
According to the present invention, the device for fixing tooling such as a pneumatic drill in a socket fixed on a support is characterized in that the front portion of the tooling includes a ring pivotally mounted on the body of the tooling and provided with at least one fastening finger capable of penetrating in a groove formed inside the socket, the ring being rotated by a toothed sector that co-operates with a rack driven by an actuator.
In this way, the tooling is presented in front of the socket in such a manner that the fastening finger(s) can penetrate into the corresponding groove of the socket and can then rotate in said groove so as to perform bayonet-type locking.
According to another characteristic of the invention, the groove of the socket comprises an axial portion for finger penetration and a helical portion extending towards the drilling jig for the purpose of clamping the tooling in the socket and consequently clamping it to the support.
Thus, rotation of the ring causes the tooling to be firmly applied against the socket and consequently against the drilling jig.
According to yet another characteristic of the invention, safety means are provided at the front of the tooling bush, which safety means may be closed by contact at the end of rotation of the helical ramp(s) and/or of the fastening fingers, such that the operating cycle of the tooling can be initialized only when the positioning of the tooling is appropriately locked.
With a pneumatic drill, such safety means is advantageously constituted by one (or more) air leaks closed only when the ring assembly of the apparatus is in contact with the socket, such closure stemming from contact between the front portion of the ring and the surface of the socket. The drill is controlled in such a manner that the tool cannot be set into rotation until the leaks have been stopped by the socket. The pneumatic pressure required for operating the tooling is obtained once the leaks are plugged. This means that the tooling can operate properly only once it is properly positioned on a socket.
According to yet another characteristic of the invention, the bush of the tooling includes at least two pegs for penetrating into orifices in the sockets, one of these preventing the tooling from rotating by compensating the torque applied thereto, while the other peg serves as keying means.
Other characteristics and advantages of the invention appear from the following description of particular embodiments given by way of non-limiting example and described with reference to the figures, in which:
FIG. 1 is a section view through tooling provided with an attachment of the invention;
FIG. 2 is a diagram of the tooling at rest;
FIG. 3 is a diagram of the tooling during penetration of the drilling unit into the fastening socket;
FIG. 4 is a diagram showing how the drilling unit is unlocked from the socket; and
FIG. 5 is a view of the actuator for controlling rotation of the ring.
FIG. 1 shows the front portion in section of tooling fastened to a drilling jig 20 by means of a socket 10. The socket 10 is itself fixed on the drilling jig by any appropriate means, in particular such a
REFERENCES:
patent: 2541306 (1951-02-01), Taylor
patent: 4770570 (1988-09-01), Tsui et al.
patent: 4990022 (1991-02-01), Watanabe et al.
Bishop Steven C.
Establissements Recoules Et Fils (S.A.)
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