Rotary shafts – gudgeons – housings – and flexible couplings for ro – Coupling accommodates drive between members having... – Coupling transmits torque via radially directed pin
Reexamination Certificate
2000-02-17
2001-12-11
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Coupling accommodates drive between members having...
Coupling transmits torque via radially directed pin
C464S178000, C464S175000, C384S536000, C384S504000
Reexamination Certificate
active
06328653
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a support device for elements protecting rotating shafts, in particular telescopic cardanic shafts.
Currently, mostly due to the codes pertaining to the “CE” mark, cardanic shafts are surrounded by protecting elements which must remain motionless while the shaft rotates at speeds which can reach and exceed even 1000 rotations/minute. The protecting elements therefore must be supported on the rotating shaft by devices that allow their mutual rotation, whilst assuring their positioning. Moreover, the set must be able to be disassembled, for any maintenance operation which may be required, and reassembled.
A currently known support device for such protecting elements is the type wherein a protecting tube is fastened externally to the related telescopic semi-shaft by means of a ring nut, whose inner edge is inserted able slidingly to pivot inside a corresponding groove obtained in the fork of the semi-shaft For this purpose, the ring nut presents circumferential projections which are engaged in corresponding slots obtained in the protecting tube.
Moreover, the ring nut, made of plastic material, presents a through cut to allow it to be widened and then opened in order to insert its inner edge into the groove of the fork and force it to remain therein. The inner edge of the ring nut, which is thus subjected to rubbing, must be lubricated periodically by means of a lubricator.
A disadvantage of this prior art support device consists of the fact that, although the edge is made of plastic material with low friction coefficient, over time it becomes worn. This is also due to the fact that lubrication is not optimal, the edge being discontinuous to allow for the ring nut to be widened during its mounting. Furthermore, the ring nut-fork coupling is exposed to dust and to contaminants in general, with the consequent loss of lubricating grease.
The wear of the ring nut edge leads to the loosening of the shaft-protection coupling, and possibly to its rupture, with the consequent detachment of the elements protecting the telescopic shaft.
SUMMARY OF THE INVENTION
The purpose of the present invention therefore is to eliminate the aforementioned drawbacks, aiming to provide a coupling between protecting elements and shaft which is durable, has reduced maintenance requirements, is small in size and, at the same time, is easy to use.
The invention, as it is characterized by the claims that follow, solves the problem of providing a support device for elements protecting rotating shafts, in particular telescopic cardanic shafts, of the kind wherein, in each semi-shaft terminating with a fork, is present a support ring nut engaged with a protective casing and with a protective tube and surrounded by a sealing sleeve, which from a general point of view is comprising at least an inner rolling race for rolling elements obtained circumferentially external in a cylindrical part of said fork, and at least an outer rolling race on two semi-shells coaxial to said cylindrical fork portion and mutually opposite, and a cage for said rolling elements; said semi-shells being contained between said ring nut, provided with retaining borders, and said cylindrical fork portion.
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patent: 3044278 (1962-07-01), Geisthoff
patent: 3044279 (1962-07-01), Atkinson
patent: 3053062 (1962-09-01), Geisthoff
patent: 3136140 (1964-06-01), Atkinson
patent: 3703089 (1972-11-01), Geisthoff
patent: 4443207 (1984-04-01), Buthe et al.
patent: 4647230 (1987-03-01), Friedrich et al.
patent: 4925322 (1990-05-01), Hishida
Browdy and Neimark
Browne Lynne H.
Eurocardan S.p.A.
Thompson Kenn
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