Clamping chucks for machine tools
Patent Information
- Application Number
- DEB0175017
- Authority / Receiving Office
- DE · DE
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 1936-07-28
- Publication Date
- 1938-08-01
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing clamping chucks for machine tools face difficulties in securely gripping workpieces due to limited gripping points and structural complexities, especially when dealing with round workpieces or tools, and require special devices for simultaneous pressure application, which complicates their integration into headstocks.
A clamping chuck with a conical head and external thread, where the thread of the clamp engages with a coaxial rod, allowing perpendicular force components to securely grip the workpiece at multiple points through a single movement, facilitated by a split design that accommodates different workpiece diameters and interchangeable jaws.
Enables secure, efficient clamping of workpieces at multiple points with a single movement, simplifying integration into machine tools and accommodating various diameters without structural complications.
Description
[0001] Clamping chucks for machine tools In machine tools with a rotating work spindle, clamping chucks are needed, in which For gripping a round workpiece or tool, clamping chucks with a split, conical head are used. These chucks exhibit but this has the disadvantage that the segments of the clamp only grip at their outermost ends.
[0002] There are also chucks which grip along their entire length or at least at both ends. However, such chucks are equipped with two tapered They are equipped with prongs on which pressure can only be applied simultaneously by special devices. The introduction of such chucks Working within the headstock involves all sorts of structural difficulties.
[0003] The invention relates to a chuck of a similar type, but in addition to the clamp with a conical head, it also has a clamp with external threads, which are caused by the tension or pressure exerted on a rod that is coaxial with the main spindle and also has a thread. It is clamped in place. It is characterized by the fact that the thread of the clamp entering the screw threads of this rod is split. where 'the tensile or impact force acting on the rod with its components acts perpendicularly on the screw surfaces and the jaws of the clamp Press firmly onto the piece to be grasped. In this way, a clamping effect is achieved on the piece to be held with a single movement. at least two points that are far enough apart to allow for a rigid hold.
[0004] If one is dealing with automatic lathes in which the workpiece is in bar form, the front clamp has the same Diameter like the rear one. This doesn't need to be the case when clamping tools. It is sufficient that the relevant clamps The diameter to be gripped corresponds to the opening. The split of the front clamp is offset from that of the rear clamp.
[0005] Three embodiments of the invention are shown in the drawing by means of longitudinal sections. They are shown in Fi,g. r A clamp moved by tension and, in Fig. a, a clamp moved by impact. In Fig. 3, the arrangement is similar to that in Fig. r; however The jaws of both clamps are equipped with bearing chucks.
[0006] In Fig. r, a denotes the front end of the headstock of a lathe, in which an inner, conical bearing surface b for the head c a clamping chuck, the rear end of which is designated d. This end is provided with a single-sided pointed thread e, which is an internal thread provided at the end of a hollow rod engages. The clamping chuck is split both at its front end at f and at its rear end at g. The workpiece h is to be held in the axis. the headstock is clamped in place.
[0007] If a pull is exerted on the rod s to insert the clamping head c into the bearing b, a force is applied to the thread flanks e Vertical pressure is exerted, which presses the rear end of the clamp firmly onto the rod h. In this case, the front clamp has the same Diameter like the rear one.
[0008] In the example according to Fig. a, the tapered bearing b is designed to widen inwards at the front end of the spindle shaft, so that the The conical head c of the clamp dl closes when axial pressure is applied to the rod s1. In this case, the thread of the rod also engages. si the thread ei, and since this thread is cut in a direction opposite to the direction of the thread in Fig. i, it also closes This clamp. The front clamp is cut open at f and the rear clamp at g.
[0009] It is easy to understand that when the rod s is pushed to the right into the head of the headstock, a pressure is exerted on the flanks the threaded teeth and the force components acting perpendicularly on these tooth flanks also the rear clamp the rod They will be clamped in place. In the embodiment according to Fig. 3, the general arrangement is the same as in Fig. 1. In both the front and rear clamps. The jaws are equipped with bearing chucks i, il, each held in place by screws k. These bearing chucks are fitted with different sizes depending on the size of the workpiece. The clamping workpieces have different thicknesses and are therefore interchangeable.
[0010] The thread form in these embodiments is a one-sided pointed thread; it could also be a trapezoidal thread or even an ordinary thread. Pointed threads are used.
Claims
[0011] PATENT CLAIMS: i. Clamping chuck with conical head and with externally threaded extension sleeve for machine tools with rotating work spindle, in which clamping is accomplished by pulling or pushing using a rod coaxial with the spindle, characterized in that the threaded sleeve is split, so that the thread perpendicular to the spindle, which faces the flanks The component of the tensile or compressive force acting on the threads presses the jaws of the chuck against the workpiece. -e.g., clamping chuck according to Claim i, characterized in that the splitting of the sleeve is offset from the splitting of the conical head.