US Patent: 3,367,479 - Impact absorbing apparatus


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US Patent: 3,367,479

Impact absorbing apparatus

Patentees:

Robert Alexander Baldrey (exact or similar names) - West Vancouver, BC Canada

Gordon McIntosh Letson (exact or similar names) - Whonnock, BC Canada

USPTO Classifications:

198/785

Tool Categories:

woodworking machines : woodworking machine parts or accessories : woodworking machine material handling

Assignees:

None

Manufacturer:

Letson & Burpee, Ltd. - Vancouver, BC Canada

Witnesses:

Unknown

Patent Dates:
Applied:	Jun. 13, 1966
Granted:	Feb. 06, 1968

Patent Pictures:

USPTO (New site tip)
Google Patents
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Vintage Machinery entry for Letson & Burpee, Ltd.

Description:

The invention is an elastomeric coupling between a log feed roll and its shaft. The idea itself was not new and the real innovation is the shape of the annular insert which is claimed to sufficiently absorb heavy impacts while having sufficient shear strength and torsional rigidity. Providing such a shock absorber prevents bearing damage and allows the roll-case frame to be welded directly to the floor which avoids misalignment problems.