US 1592313

Search Results Summary

CAFC 2026 docket search: No results found for patent number 1592313 in any 2026 Federal Circuit docket. This is consistent with the patent's status — it expired by operation of law in 1943 (17-year term from issue), so it is not a plausible subject of 2026 litigation. I found no indication of any USPTO PTAB or CAFC proceeding involving this patent number.

USPTO/patent database search: The only exact match for "1592313" is US1592313A, confirmed via Google Patents and cross-cited in later crusher patents (e.g., US2579238, EP2870999A1). I did not find any other patent assigned this number.

US Patent 1592313 — Summary

Abstract: This 1926 patent predates the USPTO's formal abstract requirement, so no official abstract exists. Based on the specification, the invention is a gyratory cone crusher for fine reduction in which material flows by gravity through a crushing zone between a normally fixed concave and a gyrating cone. Key improvements include: (1) a yielding/spring-loaded concave that tilts to pass uncrushable material ("tramp iron") without breakage or stoppage; (2) optionally yieldingly mounted cone and concave ("opposed yieldingly supported crushing elements"); (3) very fine adjustment of cone-to-concave spacing; (4) a stepped shaft/eccentric-sleeve bearing arrangement; (5) a spherical-head mounting with a concentric spherical feed-limiting/distributor plate; (6) a counterweight formed as a receptacle for molten lead; and (7) an internal, concealed oiling system that keeps dust and water out of the bearings.

Plain-Language Overview of the Claims

The patent has 44 claims. Because this is an early-20th-century patent, none of the claims incorporate another claim by reference — all 44 are written in nominally independent form, though many are narrower variations of a common theme. A plain-language reading of each:

Concave spring-release group (Claims 1–11) — the core invention:

1. Cone + concave on a fixed support, with yielding means holding the concave normally fixed but allowing it to move when crushing pressure exceeds normal.
2. Same as claim 1, specifying the release is lateral movement.
3. Yielding means hold the concave normally fixed, and it is mounted to tilt under excess pressure.
4. Normally rigid but releasable connection between concave and frame, yielding under pressure on the concave's crushing face.
5. Adds that the yielding connection is a set of springs compressed between the tiltably mounted concave and the frame.
6. Same, with the springs being vertically disposed coil springs.
7. Springs compressed between the concave's lower edge and the frame, with supporting bolts aligned with the springs.
8. Inverted bowl (concave) overhanging the cone, carried by a supporting ring on the frame, with yielding means holding the bowl and ring down in their lowest position.
9. Both the cone (relative to its support) and the concave (relative to the crusher) are yieldingly held.
10. Both cone and concave are yieldingly mounted relative to their supporting members.
11. Combination of a yieldingly mounted concave and a yieldingly mounted cone in one crusher.

Stepped shaft/sleeve bearing group (Claims 12–14):
12. Eccentrically apertured sleeve and gyrating shaft having opposed, stepped bearing surfaces of successively smaller diameter.
13. Shaft has stepped cylindrical sections; the sleeve's aperture is stepped to match.
14. The shaft's stepped portions are spaced from the ledges of the sleeve aperture (oil/clearance spaces).

Mantle clamping group (Claims 15–16):
15. Tapered gyratory shaft carrying a one-piece conical head; a mantle seated on the head is clamped by a sleeve slidable on the shaft's upper cylindrical portion.
16. Same, with the downward thrust provided by a nut threaded onto the shaft top.

Feed-limiting/distributor plate group (Claims 17–21):
17. A feed-limiting plate with a central upwardly convex spherical portion and a surrounding rim.
18. A feed-limiting plate with an upwardly convex spherical upper surface.
19. A deflector plate with a downward stem received in an axial aperture in the shaft top.
20. The deflector plate's spherical surface is concentric with the cone's spherical bearing.
21. Adds a rim and a feed chute vertically aligned above the spherical portion.

Adjustment/hardware group (Claims 22–23, 43):
22. Vertically adjustable support member for the crushing concave with apertured ears.
23. Supporting nuts threaded on the bolts above and below the ears, with locking means.
43. Holding bolts pivoted on the main frame and constrained vertical by transverse pins.

Counterweight group (Claims 24–25):
24. Counterweight for the eccentric-sleeve gear formed as an upwardly open receptacle for molten metal (e.g., lead).
25. Same, with the receptacle integral with the gear.

Eccentric-sleeve support group (Claims 26–28):
26. Plate secured to the bottom of the bearing housing with a bearing connection to the bottom of the eccentric sleeve.
27. Adds a friction-reducing surface and rotating disk between the plate and sleeve.
28. Adds means preventing relative rotation of the disk and sleeve.

Feed-spout/apron group (Claims 29–30):
29. Feed spout above the deflector plate, vertically adjustable, with a flexible apron.
30. Same, with the apron in telescopic relation with the surrounding housing.

Concave tilting support group (Claims 31–33):
31. Yielding means hold the concave in fixed relation to the frame but permit tilting under excess pressure.
32. Adds a tilting connection between the concave's outer edge and the frame's upper edge.
33. Same, with the frame's upper edge received in a channel in the concave, the bearing surfaces being inclined.

Parallel-surfaces / fine-crushing group (Claims 34–42, 44):
34. Cone and concave surfaces are parallel through most of their length; one flares away from the other at the top of the crushing zone.
35. Opposed crushing elements at substantially equal mean distance, with a yielding securing means on one element for lateral release.
36. Parallel crushing surfaces + feed-restricting means + a yielding release on one element.
37. Parallel surfaces + concave release, tilting about a center opposite the pressure point.
38. Same tilting-release behavior without the parallel-surfaces limitation.
39. Concave moves vertically relative to the cone as it recedes laterally.
40. Concave recedes along an arc different from the cone's path.
41. Cone on a spherical support; the concave's recession arc is eccentric to the cone's rotation center.
42. Inverted concave overhanging the cone, with a feed-restricting plate on the cone at least as large as the concave's upper aperture.
44. Parallel surfaces with the concave flared outward away from the cone along the upper portion.

Notes on Uncertainty

• No official abstract exists; the "abstract" above is my synthesis from the specification (the full patent text you supplied is the authoritative source and matches the Google Patents record).
• Claims 22–23 are partially garbled in the OCR of the supplied text (claim 22 cuts off mid-sentence; claim 23 lacks a preamble). I interpreted them in context with the specification's vertically adjustable frame-member (O) and bolt/nut (P, P4, P5) structure.
• Assignee name discrepancy: the patent front page says "Symons Brothers Company ... of Milwaukee, Wisconsin, a corporation of South Dakota," while Google Patents' structured data abbreviates it as "SYMONS BROTHERS CO." Same entity.
• No CAFC 2026 docket entry exists for this patent; given the 1943 expiration, none would be expected. If you need confirmation of litigation history, the relevant historical case is Smith Engineering Works v. Nordberg Mfg. Co., 68 F.2d 492 (7th Cir. 1934), which involved companion Symons crusher patents (US1,537,564 / US1,537,565) — not this patent number.