Rotary shafts – gudgeons – housings – and flexible couplings for ro – Shafting
Reexamination Certificate
2001-02-12
2003-03-04
Browne, Lynne H. (Department: 3679)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Shafting
C464S160000, C464S162000
Reexamination Certificate
active
06527643
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to an extendable mechanical transmission of the type which are used in agriculture in many systems for transmission of the movement between an operating machine and a driving machine; this transmission generally comprises a pair of splined shafts which are capable of sliding axially with respect to each other in order to vary the length of the transmission and which are engaged with each other angularly for transmission of the rotational movement; these transmissions have, at the two ends, two cardan joints which are connected to each one of the two splined shafts and each of which comprises a pair of fork members articulated. perpendicularly with respect to each other.
Some difficulties arise during assembly of the splined-shaft transmission between each end cardan joint and the power takeoff which is provided in the adjacent mechanism; angular engagement is envisaged between a splined hub, generally of the power takeoff or the drive system, and a splined seat provided in the external fork member of each of the end cardan joints of the telescopic cardan shaft transmission. These difficulties are clarified more fully in the text which follows and are solved by the invention in question.
OBJECTS AND SUMMARY OF THE INVENTION
The invention therefore relates to a telescopic extendable mechanical transmission with two splined shafts axially slidable with respect to each other and in particular equipped with two end cardan joints with engaging systems for coupling to adjacent mechanisms; according to the invention, the splined profiles of the two shafts are shaped so as to provide mutual angular play.
In particular, the transmission comprises an outer splined shaft equipped with inner splines and an inner splined shaft equipped with outer projections;
in this case the inner splines of the outer shaft have a width greater than the width of the outer projections of the inner splined shaft, in order to obtain a mutual angular play of at least 60°, when six projections and six splines are envisaged.
The outer shaft may be tubular with a constant thickness and one of the splines may have a depression at the entry point, while a corresponding depression is provided along one of the longitudinal projections of the inner shaft. This results in an obligatory relative position of the two shafts.
REFERENCES:
patent: 1965742 (1934-07-01), Junkers
patent: 2348071 (1944-05-01), Johnstone
patent: 2394405 (1946-02-01), Schjolin
patent: 3575015 (1971-04-01), Geisthoff
patent: 3884049 (1975-05-01), Pauli
patent: 4365686 (1982-12-01), Orain
patent: 5226853 (1993-07-01), Courgeon
patent: 5245890 (1993-09-01), Honlinger et al.
patent: 5657545 (1997-08-01), Haworth et al.
patent: 5762556 (1998-06-01), Kurian
patent: 5827122 (1998-10-01), Kurian
patent: 5938534 (1999-08-01), Kurian et al.
Browne Lynne H.
McGlew and Tuttle , P.C.
Thompson Kenn
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