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US Patent: 852,145
Valve Jack
Patentee:
Ernest Stevens - Chicago, IL

USPTO Classifications:
29/219, 411/433

Tool Categories:
specialty tools : valve spring tools

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Edward T. Wray
Abbie E. Johnson
James T. Ross

Patent Dates:
Applied: Mar. 04, 1907
Granted: Apr. 30, 1907

Patent Pictures:
Ernest Stevens patent April 30, 1907
USPTO pdf tiff
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Description:
The specifications describe the operation: the outer ends of the upper and lower levers are pulled away from each other to compress the spring. The nut on the "outer" rod can be turned to hold the tool in that position.

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