Joints and connections – Interfitted members – Including set screw
Patent
1994-10-26
1996-09-17
Knight, Anthony
Joints and connections
Interfitted members
Including set screw
408239R, 279 83, 72 68, F16D 108, F16D 106, B23B 3102
Patent
active
055562230
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the field of the technology of detachable connections. It specifically relates to a coupling, particularly for joining a tool to a driving unit, comprising have two facing contact surfaces at right angles to the coupling axis, first contact surface and substantially rotationally symmetrical to the coupling axis, clamping trunnion and which emanates from the second contact surface and is located in the coupling axis in such a way that the two contact surfaces engage on one another when the clamping trunnion is completely inserted in the reception bore and with a conically tapering end in the vicinity of the reception bore and transversely to the coupling axis acts through the reception body on a clamping surface on the clamping trunnion and inclined with respect to the coupling axis and produces a clamping force acting in the direction of the coupling axis. form of a tool reception or mounting device and a matching tool carrier.
PRIOR ART
Couplings for the transfer of static or dynamic forces are known from the prior art in numerous different forms and with different operating principles. In the case of couplings operating with clamping forces, a distinction can be fundamentally made between two large groups, namely one group in which the clamping forces act radially to the coupling axis and another group in which the clamping forces act in the axial direction.
In the second group the axial forces can e.g. be produced by simply screwing together the two coupling parts, which is often cumbersome and time-consuming. Alternatively a bracing effect can be achieved by the lateral introduction of forces directed at right angles to the coupling axis and which are then deflected in the axial direction (wedge action).
In the case of couplings based on the latter principle and which are frequently used as so-called high-speed couplings, for the deflection of the clamping forces use is generally made of a clamping element with a conically tapering end, which acts on a clamping surface sloping with respect to the coupling axis.
Thus, e.g. U.S. Pat. No. 3,022,084 discloses a high-speed coupling for the connection of a tool holder and tool mounting device, which has a first coupling part with a first contact surface and a cylindrical clamp bolt projecting from said contact surface, as well as a second coupling part with a second contact surface and a corresponding bore for the reception of the clamp bolt. The clamping element is constituted by a locking screw with a conical screw end, which can be screwed transversely to the coupling axis through an associated tapped hole in the wall of the reception bore and in axially displaced manner engages in a correspondingly shaped, conical bore in the clamp bolt. As a result of the axial displacement between the locking screw and the conical bore, a force only acts on the latter on one side, the inclined wall thereof acting as a clamping surface, so that there is a resultant clamping force in the direction of the coupling axis. This force presses the two contact surfaces against one another with the desired initial load and consequently brings about a force closure between the two coupling parts, which is suitable for the transfer of static and dynamic forces.
In addition, e.g. CH-A5-656,335 discloses a drilling tool, which has a coupling with comparable contact surfaces. The clamping device is in this case in the form of two facing locking screws (retaining screws) with conically shaped ends, which act from two sides on a connecting bolt also with conical ends displaceably mounted at right angles to the coupling axis in the interior of the clamp bolt. Here again an axial displacement between the axes of the locking screws and the axis of the connecting bolt on screwing in said screws ensures a clamping force in the direction of the coupling axis.
Both coupling types suffer from the disadvantage that the elements essential for the clamping device such as the conical bore or the sliding connecting bolt must be very accurately ma
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