Electricity: circuit makers and breakers – Special application – Actuated concurrently with operation or use of art device
Reexamination Certificate
2000-02-25
2001-08-14
Scott, J. R. (Department: 2832)
Electricity: circuit makers and breakers
Special application
Actuated concurrently with operation or use of art device
C192S12900A, C192S138000
Reexamination Certificate
active
06274830
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an improvement over a stop block assembled to industry-wide specifications for providing a locating device for a movable member.
BACKGROUND OF THE INVENTION
In an assembly having a reciprocal member such as a piston on a rod it may sometimes be required to know when both the piston reaches the end of its cycle at a terminating point, as well as knowing that the piston stops exactly and repetitively at a precise position against the terminating point. As is conventionally known, a cylinder is provided having a movable member located on a rod and having terminating points at each end of the rod. The terminating points are defined by stop blocks.
To provide precise locations for stopping the movable member, crowned stop blocks are provided in the barrier end so that the movable member stops exactly at the center point of the crowned stop block. The crowned stop blocks are precision manufactured parts manufactured to the specification and tolerances of the North American Automotive Metric Standards. Hence, these precision crowned stop blocks are known in the industry as NAAMS™ stop blocks. Although the NAAMS™ stop block provides a precise location stop of the movable member, in many applications, a proximity sensor/switch is also required to sense the position of the moving object.
Since the use of a proximity switch and a NAAMS™ stop block are used in many applications, it is desirable to incorporate the proximity switch within the NAAMS™ stop block such that it provides a single component having dual functions. Providing a NAAMS™ stop block with a proximity switch incorporated therein would eliminate the need to adjust the position of the proximity switch each time there is an adjustment for the NAAMS™ stop block.
SUMMARY OF THE INVENTION
The invention is an improved stop block especially for a stop block manufactured to industry standards which provides a locating device for a movable member wherein the stop block has at least one crowned end for positively positioning and facing the movable member and to accurately stop the movable member in the center of a crowned end when the movable member comes in contact with the stop block. The improvement includes a proximity switch installed within the stop block for sensing when the movable member contacts the stop block. The improved stop block of the present invention is interchangeable within other existing stop block applications manufactured and assembled to industry-wide specifications.
REFERENCES:
patent: 3544934 (1970-12-01), Poliakoff
patent: 4090091 (1978-05-01), Brown et al.
patent: 4552047 (1985-11-01), Stroup
patent: 4664364 (1987-05-01), Lymburner
patent: 4763053 (1988-08-01), Rabe
patent: 4788856 (1988-12-01), Felger
patent: 5034621 (1991-07-01), Groves et al.
patent: 5272911 (1993-12-01), Beggs et al.
patent: 5950790 (1999-09-01), Barber
patent: 6066824 (2000-05-01), Crawford et al.
Scott J. R.
Welker Bearing Company
Young & Basile P.C.
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