Lubrication – Lubricators – Gravity feed
Reexamination Certificate
1999-09-28
2001-06-19
Lorence, Richard M. (Department: 3681)
Lubrication
Lubricators
Gravity feed
C184S102000, C074S424830, C074S459500, C074S467000
Reexamination Certificate
active
06247556
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to screw bolt, nut and ball bearing assembly, and more particularly, a assembly for a screw bolt and nut in which lubricant oil is contained in the assembly. As a result, the screw bolt and nut can be operated without replenishing new lubricant oil for a long period of time.
2. Description of the Prior Art
In a ball bearing assembly, a plurality of steel balls are interposed between the bolt and nut serving for reducing frictional resistance to improve mechanical efficiency and save work energy. Although the amount of lubricant oil required for such a mechanism is little, yet if it operates in lack of lubrication for too long time, the screw bolt and nut will severely wear out. Since a conventional ball bearing for screw bolt and nut does not contain lubricant oil within itself. In such case, a separate automatic lubricating apparatus is provided, or the mechanism is manually lubricated. It is not only increasing equipment and operation cost, but also causing inconvenience to the user. In the case that the automatic lubricating apparatus becomes out of order or the operator forgets to infuse lubricant oil in time of need, the mechanism will be damaged.
SUMMARY OF THE INVENTION
Generally, a combination of screw bolt and nut with ball bearing has a spiral groove of semi-circular cross section formed along the outer surface of the screw bolt, and there is a spiral groove of circular cross section formed on the inner surface of a screw nut corresponding to that formed along the screw bolt. A plurality of rolling balls are interposed between the built and the nut and rolling in the pair of grooves thereby changing the sliding contact between bolt and nut to rotational contact therebetween.
It is a object of the present invention to provide screw bolt and nut with ball bearings in which lubricant oil is contained in the ball bearing, and the screw bolt and nut can be operated without replenishing new lubricant oil for a long period of time.
To achieve this object, the present invention provides a deep oil storage hole formed in the nut parallel to axial direction of the bolt for storing the lubricant oil. An oil nipple or an oil packing is provided at one end of the deep oil storage hole for preventing leakage of the lubricant oil. A threaded oil dripping hole intersecting the deep oil storage hole with an oil containing member therein is formed in the nut thereby causing the lubricant oil to drip gradually into the spiral grooves and lubricate the rolling balls thereof. The oil containing member can be made of felt, wool, cotton (cloth or thread ) or the like. Furthermore, an oil adjusting screw is provided with the oil dripping hole for controlling the flow rate of lubricant oil into the spiral grooves.
REFERENCES:
patent: 1701154 (1929-02-01), Gunn
patent: 3132719 (1964-05-01), Cole
patent: 4795172 (1989-01-01), Brande
patent: 5168767 (1992-12-01), Morita
patent: 5809838 (1998-09-01), Miyaguchi et al.
patent: 6125968 (2000-10-01), Shirai
patent: 6-159471 (1994-06-01), None
Dougherty & Troxell
Hiwin Technologies Corp.
Lorence Richard M.
LandOfFree
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