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US 4,289,241 AGranted
Gold pan and classifier
OwnerJay J. Litrapinventor
Life of this patent
Estimating the term…
Abstract
A gold panning and classifying method and system includes a generally rectangularly shaped gold pan having diverging side panels and a plurality of valleys and ridges in the front panel. A plurality of nesting classifying screens are included to effect a first separation of material into portions composed of equivalent size particles. The unique shape of the pan greatly enhances the gravity separation techniques for separating fine sands from gold and gold dust.
Claims25
A container for separation of a first granular material from a second granular material having a specific gravity less than said first granular material comprising:
- a generally rectangular base portion having a forward end and a rearward end, the longitudinal dimension of said base lying in the fore and aft direction of said base,
- a pair of side panels joined to and extending divergently upwardly from opposite longitudinal sides of said base,
- a front panel joined to and extending upwardly and forwardly from the forward end of said base, said front panel increasing in width as it extends upwardly in proportion to the divergency of said side panels, the forward edge portions of said side panels being joined to respective ones of the side edge portions of said front panel, said front panel having a plurality of ridges and valleys extending thereacross, each of said valleys having a substantially constant depth relative to an adjacent ridge, the ridge lines of said ridges being substantially parallel to each other and substantially parallel to the corner junction between said front panel and said base, and
- a rear panel extending upwardly from the rearward edge of said base, said rear panel increasing in width as it extends upwardly in proportion to the divergency of said side panels, the side edge portions of said rear panel being joined to respective rearward edge portions of said side panels.
1 more element
A panning and classifying system for classifying granular material and for separating at least a first granular material from a second granular material having a specific gravity less than said first material comprising
- a pan having a rectangular base, upwardly diverging side panels, an upwardly and forwardly extending front panel, and an upwardly and rearwardly extending back panel all constructed and joined so as to form an upwardly opening container, said back panel having a rearwardly extending handle connected thereto, said front panel having a plurality of spaced ridges and valleys therein, said ridge line extending across said front panel being in generally parallel relationship to the junction of said front panel and said base, at least one of said rear panel and said side panels having a plurality of traysupporting shoulders thereon, said tray-supporting shoulders being oriented generally parallel to said base, said tray-supporting shoulders being spaced from said base by distances corresponding to the distances that at least some of said ridge lines are spaced from said base so that said ridges and said shoulders cooperate to form a plurality of tray supports, the tray support nearest said base having the smallest exterior dimensions, the tray supports having increasing exterior dimensions in proportion to their increased spacing from said base,
- a plurality of trays sized to rest in nesting relationship on said plurality of tray supports said trays including a tray frame and a bottom screen, the tray nearest said base having a bottom screen with the smallest screen openings, the openings in said screens of the remaining trays having an increased size in proportion to the respective increase in spacing of said remaining trays from said base.
A method for separating a mixture of a first granular material and a second granular material having a specific gravity less than that of the first material comprising the steps of
- confining said mixture in a trough-like container in an elongated mass having a relatively flat upper surface and a longitudinal axis,
- covering said mixture with water and vibrating said container to cause said first material to settle toward the bottom of said trough-like container, leaving the second material adjacent the flat upper surface thereof,
- confining said water over and adjacent said mixture so that, as said container is moved, the water passes over said mass in a direction generally orthogonal to the longitudinal axis of said mass, said water alternately running off said mass in a layer having a uniform depth along the longitudinal extent of said mass, and running over said mass in a layer having a relatively uniform depth along the longitudinal extent of said mass, said water as it runs off said mass carrying at least a portion of said second material from the top of said mass.
A container for separation of a first granular material from a second granular material having a specific gravity less than said first granular material comprising:
- a rectangular base portion having a forward end and a rearward end, the longitudinal dimension of said base lying the fore and aft direction of said base,
- side panels joined to and extending divergently upwardly from opposite longitudinal sides of said base, said side panels and said base meeting to form parallel edge corner junctions,
- a front panel joined to and extending upwardly and forwardly from the forward end of said base, said front panel increasing in width as it extends upwardly in proportion to the divergency of said side panels, the forward edge portions of said side panels being joined to respective ones of the side edge portions of said front panel, said front panel and said base meeting to form a front corner junction that is oriented orthogonally to said edge corner junctions, said front panel having at least one ridge extending thereacross spaced from but in parallel relationship to said front corner junction, and
- a rear panel extending upwardly from the rearward edge of said base, said rear panel increasing in width as it extends upwardly in proportion to the divergency of said side panels, the side portions of said rear panel being joined to respective rearward portions of said side panels, said rear panel and said base meeting to form a rear corner junction that is oriented orthogonally to said edge corner junctions.
1 more element
Dependencies are inferred from the claim text.