US1568869A - Clamping chuck - Google Patents

Description

Jan. 5 1926.

' 1,568,869- H. BOES CLAMPIN `CHUCK Filed March 28, 1925 Patented `lan. 5, 1926.

HEINRICH reas. 0F 3.01m .G-EeMeNY.

@Alarme GHUQK- Application filed March 28, 19 25 Serial No. 19,161.

To all whom t mrijz/ concern.' Be it known that I, HEIN on Bons, a citi` zen of the German VRepublic, and resident of Bonn,Rosentalv Street lpGerinany, have invented a new Iand useful improved Clamping-Chuck (for whichl have tiled an application iiiGeiaiiany, Feb. G, 1192i), of'which the :following :is a specification.

'My invention relates to a clamping chuck intended for use especially in connection with drills `and the like, and being distinguished with respect to the known chucks in which rradially movable clamping cheeks are ,moved inwards and outwards by `a .ro- :tatory sleeve adapted to be .turned upon a `mandrel extending .through this sleeve by the vfacts that the clamping cheeks 1project :laterally .out of the mandrel-slots having .saidcheelrs arranged within them, .and that .the sleeve-chamber enclosing these parts hat' an annularsloping bottom-face, and that an -annulus vclosing ythe vsieeve.-cliarnber at its :front-end has a correspondingly.sloping inner face which contacts with thefront `facesof fthe projecting cheek-parts, `whose rear kfaces Contact with .said .slopingbottoni-face, ofthe sleeve-chamber, the y arrangement beingsuch that :the clamping cheeks are actuated, i. ve.

V.moved radially,.as Awellfas axially, by turnling :the sleeve, the :said :sloping faces .transn'iitting the i motion to the cheeks, asis .more :fully describedfliereinafter. n

f My invention is illust-rated j Idiagrannnati callyuand `bycway of examplein the accom- ,pan in g crawing inwhich- Figure 'l is a side view ofthe complete clinch;

Figure 2 is in its lower part an axial section through the chuck, the radially adjustable clamping. cheeks, (d) thereof assuming their inner position, and the mandrel (u) being shown in side view, as in Fig. l;

Figure 3 is an illustration similar to Fig. 2, but the clamping cheeks being shown in their outer position, and the mandrel being turned 900 relatively to Figs. l and 2;

Figure 4t is a rear view of Fig. l, seen in the direction from the mandrel to the adjusting sleeve (b) Figure 5 is a horizontal section through the chuck;

Figure 6 is a frontal View of the chuck, i. e. seen in the direction from the frontal face of the adjusting sleeve to the mandrel;

Figure 7 is a side view of the front end of the mandrel;

Figure 8 is an axial section through the front end of the. mandrel;

Figure 9 is a perspective view of one of .the (three) clamping cheeks, drawn to an enlarged scale relatively to the other figures, and :being seen inthe direction from its flat narrow outer face to `the' wedge-shaped, Fig. 10) .inner face; and

`Figure l() is an illustration similar to Figure 9, the clamping vcheek being seen in ythe direction from its wedge-.shaped inner 'lv-.ce to its (flat narrow, Fig. 9) outer face.

The chuck consists of two main members which are the `mandrel or, more precisely, holding mandrel u. ,and .the adjusting sleeve @the ,rear end of which is threaded .internally and screwed `upon an external thread u offtheinandrel a; the chuck consists, fu r .ther of ,three clamping cheeks `al which are ,located in three radially disposed slots d provided ,in the front endof theinandrel, i. e. that end which `isjylocated in the front half of Ithe sleeve o and l.enclosed by it.` The slots al areof rhomboidal sha-pe; they converge towards theffrontal face o of the man drel where they communicate with one another and with an opening provided in that" faceo vfor,thereception ofthe wdrill or the like, asappe'ars ,from Fig. 8.

' lilaofh..slotjolcontains,a clamping check cl', lthe particular; shape of which 'appears especially from 9l and ,10Q The vradial length of the checks d fisgreater than the radial length pr deptlrof the slots also that 1 each cheekfprojects beyond the vouter end of the appertainingzslot. The projectingl` part of `A`eachcheek .formsa foot ,d3 `at its front iendlwith..which ithabuts on an annulusb2 @secured 'inQthe :front end'of thesleeve b. y.The 3inner .diameterof the sleeve, is large enough to ireceive said projecting parts of the clamping cheeks, and the bottom of the sleeve-chamber forms a sloping circular shoulder o with which contact the correspondingly sloping inner end faces [Z2 of the clamping cheeks al, as appears from Figs. 2 and 3. -The end-faces d2 can slide radially upon said sloping circular shoulder o', and the frontal faces of the feet d3 can slide upon the slightly conical inner face of the annulus b2, the Obliquity of which corresponde, exactly to that of the said face o. Figs. 2 and 3 show the two extreme positions of the clamping cheeks d in that in Fig. 2 the wedgeshaped inner edges thereof contact, or Contact nearly, with one another (the feet cl3 contacting at their inner faces with the circumferential surface of the inandrel a), and in Fig. 3 the itat narrow outer faces of the cheeks contact, or contact nearly, with the inner circumferential wall of the sleeve Z1, i. e. with the chamber in the front part thereof.

The clamping cheeks can be moved into, and out of, the slots (l of the mandrel a by turning the sleeve b upon the mandrel wherebyv the sleeve is moved axially upon the mandrel by means of the threads of both parts. Two of the possible relative positions of these parts are shown in Figs 2 and 3; those two positions are, in fact, the two extreme or end-positions, corresponding to the extreme positions of the clamping cheeks, as already mentioned. `Villien the sleeve b is in the position shown in Fig. 2, and is being turned, the annulus b2 presses against the frontal faces of the feet Z3 of the cheeks, and moves them, i. e., of course, not merely said feet, but the entire cheeks, axially, but owing to the rhomboidal configuration of the slots (Z of the mandrel a, as well as to the corresponding configuration of the clamping cheeks, these latter are moved also radially whereby the wedge-shaped clamping faces arc separated from one another so as to provide the space necessary for the reception of the drill or other tool to be clamped fast by and in the chuck.

rFhe position of the clamping cheeks in Figs. 5 and (3 corresponds to their position in Fig. 2.

The position of the mandrel in Fig. e corresponds to its position in Figs. l and 2.

The annulus b2 is affixed in the sleeve Z) by screws e, Fig. 5, but, of course, any other suitable fastening means may be used instead of said screws.

The sleeve b is roughened on its circumferential outer surface so that it can be `grasped firmly and turned easily.

lThe degree of Obliquity of the sloping fares of the clamping cheeks and of the corresponding faces of the slots (l is such that the drill or other tool clamped fast by and in the chuck can be retained in place solely by the sleeve, that is to say, without the assistance of a counter-nut or any equivalent thereof. The respective tool is held fast, firmly and reliably, even when subjected to great stress.

I claim:

A clampingchuck for drills and the like comprising in combination, a mandrel having radial slots formed in the tool receiving end thereof, each of said slots having their upper and lower faces converging and ar- 'anged in parallelism, an adjusting sleeve rotatably engaged over and adjustable with respect to said mandrel having an internal annular chamber therein,the upper end of said chamber being downwardly and outwardly inclined and the lower end of the chamber being open, an annulus engaged in the open lower end of the sleeve closing the lower portion of said internal chamber, the inner face of such annulus being downwardly and out wardly inclined and arranged parallel to the upper end of said internal chamber, clamping checks correspondingly shaped to said slots received in the same and movable therein, the upper and lower faces of these cheeks being slidably engaged with the adjacent faces of the slots and arranged in parallelism thereto, the upper end portions of said cheeks being extended laterally from the slots and formed with oblique faces slidably engageable with and parallel to the upper end of the annular chamber, and laterally positioned longitudinally extending feet on the outer sides of each of said cheeks arranged beyond and without the outer sides of said slots and received in portions of the internal annular chamber in the adjusting sleeve, the outer ends of each of said feet being obliquely formed and arranged parallel to the inclined surface of the inner side of said annulus and being slidably engage able thereover.

In witness whereof l have hereunto set my l'ia'nd.

H El N RICH BOES.

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