US4895474A — Coupling system for rotational and axially stiff …

Claim 1

Independent Claim 592 words

Coupling system for rotational and axially stiff coaxial coupling of a first rotatable shaft element (3) to a second rotatable shaft element (4), defining a central axis of rotation (2), each of said shaft elements being formed with flat transverse matching frictionally engaged, abutting engagement surfaces (5, 6), comprising the combination of a first cylindrical concentric engagement fit bore (7) formed in the first shaft element (3); a second cylindrical concentric engagement fit bore (8) formed in the second shaft element (4); a first cross bore (9') extending transversely through the first shaft element (3) and intersecting the first engagement fit bore (7), said first cross bore being subdivided by the first engagement fit bore (7) into two diametrically located first bore portions (12', 13'), and having an axis (11') intersecting the central axis (2) at a right angle; a second cross bore (9) extending transversely through the second shaft element (4) and intersecting the second engagement fit bore (8), said second cross bore being subdivided by the second engagement fit bore (8) into two diametrically located second bore portions (12, 13), and having an axis (11) intersecting the central angle (2) at a right angle; a coaxial engagement fit peg (24, 24', 31) located in both the first and second engagement fit bores (7, 8), fitting snugly therein and connecting said shaft elements together; a first bolt cross bore (25') defining a first bolt cross bore axis (26') extending transversely through the engagement peg (24, 24', 31) at a level of the first cross bore (9') when the peg is positioned in the first engagement fit bore (7); a second bolt cross bore (25) defining a second bolt cross bore axis (26) extending transversely through the engagement peg at a level of the second cross bore (9) when the peg (24, 24', 31) is positioned in the second engagement fit bore (8); said first and second cross bores (9, 9') through the first and second shaft sections (3, 4) and the first and second bolt cross bores (25', 25) through said coaxial fit plug (24, 24', 31) being axially spaced from each other and from said frictionally engaged abutting engagement surfaces (5, 6); a first longitudinally adjustable cross bolt engagement element (14') located in one (12') of said first cross bore portions; a first cross bolt counter element (19') located in the other (13') of said first cross bore portions; a second longitudinally adjustable cross bolt engagement element (14) located in one (12) of said second cross bore portions; a second cross bolt counter element (19) located in the other (13) of said second cross bore portions; a first connection bolt (27') located in the first cross bore (9') and having essentially frustoconically interfitting end portions (28', 29') engageable, respectively, with the first cross bolt engagement element (14') and the first cross bolt counter element (19'); a second connection bolt (27) located in the second cross bore (9) and having essentially frustoconically interfitting end portions (28, 29) engageable, respectively, with the second cross bolt engagement element (14) and the second cross bolt counter element (19); and wherein, upon engagement of said engagement surfaces (5, 6), the spacing of the axes (11, 11') of the first and second cross bores (9, 9') is longer than the spacing of the axes (26, 26') of the first and second bolt cross bores (25, 25') extending through the coaxial engagement peg (24, 24', 31) and said engagement surfaces are frictionally engaged upon longitudinal adjustment of said first and second cross bolt engagement elements (14', 14).

Claim 2

Dependent Claim 592 words

Coupling system for rotational and axially stiff coaxial coupling of a first rotatable shaft element (3) to a second rotatable shaft element (4), defining a central axis of rotation (2), each of said shaft elements being formed with flat transverse matching frictionally engaged, abutting engagement surfaces (5, 6), comprising the combination of a first cylindrical concentric engagement fit bore (7) formed in the first shaft element (3); a second cylindrical concentric engagement fit bore (8) formed in the second shaft element (4); a first cross bore (9') extending transversely through the first shaft element (3) and intersecting the first engagement fit bore (7), said first cross bore being subdivided by the first engagement fit bore (7) into two diametrically located first bore portions (12', 13'), and having an axis (11') intersecting the central axis (2) at a right angle; a second cross bore (9) extending transversely through the second shaft element (4) and intersecting the second engagement fit bore (8), said second cross bore being subdivided by the second engagement fit bore (8) into two diametrically located second bore portions (12, 13), and having an axis (11) intersecting the central angle (2) at a right angle; a coaxial engagement fit peg (24, 24', 31) located in both the first and second engagement fit bores (7, 8), fitting snugly therein and connecting said shaft elements together; a first bolt cross bore (25') defining a first bolt cross bore axis (26') extending transversely through the engagement peg (24, 24', 31) at a level of the first cross bore (9') when the peg is positioned in the first engagement fit bore (7); a second bolt cross bore (25) defining a second bolt cross bore axis (26) extending transversely through the engagement peg at a level of the second cross bore (9) when the peg (24, 24', 31) is positioned in the second engagement fit bore (8); said first and second cross bores (9, 9') through the first and second shaft sections (3, 4) and the first and second bolt cross bores (25', 25) through said coaxial fit plug (24, 24', 31) being axially spaced from each other and from said frictionally engaged abutting engagement surfaces (5, 6); a first longitudinally adjustable cross bolt engagement element (14') located in one (12') of said first cross bore portions; a first cross bolt counter element (19') located in the other (13') of said first cross bore portions; a second longitudinally adjustable cross bolt engagement element (14) located in one (12) of said second cross bore portions; a second cross bolt counter element (19) located in the other (13) of said second cross bore portions; a first connection bolt (27') located in the first cross bore (9') and having essentially frustoconically interfitting end portions (28', 29') engageable, respectively, with the first cross bolt engagement element (14') and the first cross bolt counter element (19'); a second connection bolt (27) located in the second cross bore (9) and having essentially frustoconically interfitting end portions (28, 29) engageable, respectively, with the second cross bolt engagement element (14) and the second cross bolt counter element (19); and wherein, upon engagement of said engagement surfaces (5, 6), the spacing of the axes (11, 11') of the first and second cross bores (9, 9') is longer than the spacing of the axes (26, 26') of the first and second bolt cross bores (25, 25') extending through the coaxial engagement peg (24, 24', 31) and said engagement surfaces are frictionally engaged upon longitudinal adjustment of said first and second cross bolt engagement elements (14', 14).

Claim 3

Dependent Claim 45 words

The coupling of claim 1, wherein the projections of the axes (26, 26') of the cross bores (25, 25') of the engagement fit peg (24, 24', 31) intersect in a plane at right angles to the axis (2), at an angle between 0° and 90°.

Claim 4

Dependent Claim 42 words

The coupling of claim 1, wherein the projections of the axes (26, 26') of the cross bores (25, 25') of the engagement fit peg (24, 24', 31) intersect in a plane at right angles to the axis (2), at a right angle.

Claim 5

Dependent Claim 29 words

The coupling of claim 1, wherein the engagement fit peg (24, 24', 31) has a constant diameter, at least in a longitudinal portion including both cross bores (25, 25').

Claim 6

Dependent Claim 38 words

The coupling of claim 1, wherein the engagement fit peg (24', 31) is divided into two cylindrical portions (36, 36') coaxial with one another, which have different diameters and each of which includes one cross bore (25, 25').

Claim 7

Dependent Claim 33 words

The coupling of claim 1, wherein the engagement fit peg (24, 24', 31) is inserted into the fit bore (7, 8) of at least one shaft element (3, 4) with an interference fit.

Claim 8

Dependent Claim 18 words

The coupling of claim 6, wherein the dimensional difference for the interference fit is between 0μm and 15μm.

Claim 9

Dependent Claim 32 words

The coupling of claim 1, wherein the engagement fit peg (24, 24', 31) is inserted into the fit bore (7, 8) of only one shaft element (3, 4) with an interference fit.

Claim 10

Dependent Claim 54 words

The coupling of claim 1, wherein the spacing of the axis (11) of the cross bore (9) in one shaft element (4) from the associated engagement surface (6) is equal to the spacing of the axis (11') of the cross bore (9') in the other shaft element (3) from the associated engagement surface (5).

Claim 11

Dependent Claim 13 words

The coupling of claim 1, wherein both connection elements (27, 27') are identical.

Claim 12

Dependent Claim 37 words

The coupling of claim 1, wherein both connection elements (27, 27') include a through opening (33, 33') extending transversely to their longitudinal axis (26, 26'), and the engagement fit peg (24) includes a coaxial longitudinal bore (33).

Claim 13

Dependent Claim 27 words

The coupling of claim 1, wherein at least one of the connection elements (27, 27') is retained in captive fashion in the respective cross bore (25, 25').

Claim 14

Dependent Claim 34 words

The coupling of claim 12, wherein the connection elements (27, 27') are secured against rotation beyond a predetermined limited with respect to their longitudinal axis (26, 26') in the respective cross bore, 25, 25').

Claim 15

Dependent Claim 29 words

The coupling of claim 1, wherein the reversible rotational slippage occurring between the two shaft elements (3, 4) at a torque with respect to the axis (2) is predeterminable.

Claim 16

Dependent Claim 62 words

The coupling of claim 14, wherein the spacing of the axes (11, 11') of the first and second cross bores (9, 9') from the axes (26, 26') of the first and second bolt cross bores (25, 25') is selectable to provide for controlled rotary slippage and wherein, for relatively greater rotary slippage, said spacing is smaller than for relatively smaller rotary slippage.

Claim 17

Dependent Claim 52 words

The coupling of claim 1, wherein the end portions of the connection bolts (27, 27') and the end portions of the respective cross bolt engagement elements (14, 14') and of the counter elements (19, 19') are interfitting by an at least approximately or essentially conical projection-and-recess fit formed by projections and recesses.

Claim 18

Dependent Claim 17 words

The coupling of claim 16, wherein at least one of the interfitting projections and recesses are part-spherical.

Claim 19

Dependent Claim 43 words

The coupling of claim 16, wherein at least one of the interfitting projections and recesses are part-spherical and define two spherical portions having respective centers which are axially above and below a longitudinal axis (26, 26') of the respective connection bolt (27, 27').

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-01-22	1993-07-24	1994-01-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-01-22	1997-07-24	1998-01-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-01-22	2001-07-24	2002-01-23	$7700.00	Window Closed / Lapsed

Coupling system for rotational and axially stiff coaxial coupling of two shaft elements

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