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US Patent: 61,420
Tool Holder for Planing Machines
Patentee:
Charles Hall - New York, NY

USPTO Classifications:
409/346

Tool Categories:
metalworking machines : metal planers : metal planer accessories

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
E. S. Rewick
W. L. Bennem
F. W. Wurster
Charles H. Leonard

Patent Dates:
Granted: Jan. 22, 1867

Patent Pictures:
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Description:
E. S. Rewick - patent attorney

Planing machines are constructed to impart a reciprocating motion either to the work or to the tool. The tool is constructed with but one cutting edge, and the tool-holder is generally pivoted to its support so as to hold the tool stationary only when the work is being moved toward the cutting edge of the tool, leaving it free to move away from the work when the latter is moved toward its back, or, in case of a travelling tool-holder, when the back of the tool is moved toward the work. Such machines, therefore, cut only when the carriage holding the work or tool is moving in one direction, and the time occupied in returning or retrograding the carriage previous to making a new cut is lost. Planers have been devised to obviate this defect by using two tool-holders, set back to back, and also by causing the same tool-holder to turn half round upon a vertical axis at each stroke of the carriage; but these modes require greater complexity in the machinery than the ordinary mode, and for that or some other reason have not come into general use. Planers have also been devised with a tool stock vibrating upon a single central line, and holding a double-edged tool, but the mechanism for determining the movement of the tool stock has been defective, and they have not come into general use. The object of my invention is to enable the tool of the planer to operate with certainty and accuracy at each stroke of the carriage without increasing the complexity of the machine; and to this end my invention consists of the combination of the tool stock with its support by slots and pins or their equivalents, in such manner that the tool stock is permitted to move a limited distance (in the line of movement of the carriage,) in two opposite directions, so that at each stroke of the carriage, one cutting edge of the tool or tools used is thereby thrown out of its plane of operation, and a reverse cutting edge is thrown into its plane of operation.

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