Rotary shafts – gudgeons – housings – and flexible couplings for ro – Overload release coupling – Torque transmitted via resiliently biased positive drive...
Reexamination Certificate
1999-02-12
2001-01-16
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Overload release coupling
Torque transmitted via resiliently biased positive drive...
C464S030000
Reexamination Certificate
active
06174238
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a transmission coupling, especially of the torque limiting type which disengages the driven member from the drive member when the transmitted torque exceeds a maximum value and which enables re-engagement when the relative velocity drops, the members consisting of an outer member and an inner member.
BACKGROUND OF THE INVENTION
A torque limiting coupling of this type is described in Italian patent application No. FI/95/A/56 filed Mar. 23, 1995 by the same applicant, and in the corresponding European Patent Application n. 96830108.5, U.S. Pat. application Ser. No. 08/620,006 and Canadian Pat. Appl. N. 2,172,120.
These transmission couplings generally have two or more possible angular positions in which coupling can occur, a corresponding number of components for effecting the coupling being arranged in an angular distribution. This sometimes raises a problem for these transmission couplings, for which it would be desirable for coupling to occur in a unique angular position.
The abovementioned intellectual property document discloses in particular a transmission coupling that comprises: on the internal surface of the outer member, recesses with lead-in surfaces running parallel to the axis of rotation; inside the inner member, essentially radial seats allowing movement and defined by two planar walls parallel to the axis of rotation of the coupling, said essentially radial seats for allowing movement being equal in number to said recesses with lead-in surfaces; in each of said essentially radial seats for allowing movement, a sliding key resembling a tablet in shape and able to move radially under the action of elastic means in a centrifugal direction, and with a shaped outer profile able to enter one or other of said recesses with lead-in surfaces of the outer member, in order to transmit torque between said two members and generate centripetal radial forces on the sliding key.
SUMMARY AND OBJECTS OF THE INVENTION
In order to engage the coupling only in one specific angular position of the two members with respect to each other, according to the invention, in each of said recesses with lead-in surfaces there is at least one peg flush with the internal surface of said outer member, and also in each of said tablet-like sliding keys at least one transverse through notch is formed, each of said notches being designed so as to accommodate one of said pegs: the arrangement of the peg or pegs in each of the various recesses is different from that in the other recesses and corresponds to the arrangement of the notch or notches of one sliding key only; each sliding key can therefore only enter the corresponding recess, whereas it continues past the other recesses, sliding over their pegs. Engagement thus occurs only in one unique angular position of the two members of the coupling with respect to each other and simultaneously with all the sliding keys in their corresponding recesses.
In practice each recess may contain at least two pegs and each sliding key at least two notches, preferably set apart from each other, so as to have balanced pressure on the sliding keys as they pass over the pegs of a recess that is not their own. The pegs may be made in the form of screws and may engage in tapped holes in the outer member.
The description and accompanying drawing will enable the invention to be understood more fully: the drawing shows a practical, non-limiting illustrative embodiment of the invention.
The various features of novelty which characterize the invention are pointed out with particularity in the claims annexed to and forming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its uses, reference is made to the accompanying drawings and descriptive matter in which preferred embodiments of the invention are illustrated.
REFERENCES:
patent: 4468206 (1984-08-01), Herchenbach et al.
patent: 5308281 (1994-05-01), Nienhaus
patent: 5706922 (1998-01-01), Bondioli
patent: 5718634 (1998-02-01), Mikeska et al.
patent: 912411 (1954-04-01), None
patent: 2936755A1 (1981-03-01), None
patent: 3205513C1 (1983-03-01), None
patent: 96830108 (1996-03-01), None
patent: 2570425 A1 (1986-03-01), None
patent: 2615256 A1 (1988-11-01), None
PCT Search Report Nov. 20, 1997.
Browne Lynne H.
Dunwoody Aaron
McGlew and Tuttle , P.C.
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