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US3847358A Expired / Lapsed US ⏱️ 0.0 years remaining

Adjustable and yieldable breaker bar supports for impact crusher

Assignee: Allis Chalmers Corp
•
Filing: 1974-01-16
•
Granted: 1974-11-12
•
Expires: 1994-01-16
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Abstract

Abstract An impact crusher is disclosed having a rotor carrying hammers arranged to strike and throw material against target breaker bars, and an adjustable and yieldable support assembly for each end of a target breaker bar. The support assembly includes a threaded arm connected at a right angle to the bar and projecting through a bore in a rectangular shear block. The shear block is arranged in a box defined by a U-shaped channel assembly fitted over the shear block with its open end attached to the adjacent housing sidewall. The box holds the shear block against turning and a pair of shear pins which pass through the shear block and are journaled in the box, hold the shear block against axial movement. The position of the connected breaker bar is established and adjusted relative to the housing by a plurality of shims which are mounted on the arm between the breaker bar and the shear block. A nut on the arm on a side of the shear block opposite the shims, clamps the shims tightly between the breaker bar and the shear block, and overload forces are transmitted from the breaker bar through the shims to the shear block, and not through the threaded arm to the shear block, so the arm and nut threads are protected from possibly being damaged by overload forces before the pins shear. The shear pins are arranged horizontally in a common vertical plane perpendicular to the arm with one above the arm and one below the arm. Each shear pin has two axially spaced circumferential shear grooves with one groove in the vertical plane between one vertical side of the shear block and the housing sidewall, and the other groove in the vertical plane between the other vertical side of the shear block and the channel assembly. Overload forces therefore are relieved by the shear block being pushed between ends of a pair of double shear groove pins and thus cause the two pins to be sheared within the confines of the four grooves which are uniformly spaced around the pushing arm, while the shims continue to be securely clamped between the breaker bar and shear block, and present no personnel hazard of flying parts.

Inventors

  • 👤 K Lowe
  • 👤 W Gray

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 13:38
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26; B02C13/31

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 280 words
An impact crusher having a housing enclosing a rotor carrying hammers arranged to strike and throw input material to disintegrate upon impact with target breaker bars spaced from the rotor, and an improved support assembly for each end of an adjustably positioned target breaker bar having end portions projecting through horizontally extended oblong openings in sidewalls of said housing; and said support assembly comprising: a. an arm having a bushing at one end connected at a right angle to said projecting bar end portion, with an end of said arm opposite said bushing being threaded and projecting horizontally away from said rotor and beyond said sidewall opening; b. a shear block with a central bore through which the threaded end portion of the arm projects; c. a plurality of shims on said arm between said bushing and said shear block; d. a threaded nut turned on the end of the arm projecting through the shear block and clamping said shims between said bushing and said shear block; e. a channel fitted over the shear block, having an open end directed horizontally toward and attached to the adjacent housing sidewall to define a box surrounding and holding the shear block against rotation about the arm; and f. a pair of parallel shear pins arranged in a vertical plane and on opposite sides of the arm, with each shear pin having its ends journaled in said box and a midportion thereof extending through a bore in the shear block to hold the shear block against axial movement within said box unless and until said shear pins are sheared by overload force applied to the supported target bar by such as uncrushable material.
Claim 2
Dependent Claim 280 words
An impact crusher having a housing enclosing a rotor carrying hammers arranged to strike and throw input material to disintegrate upon impact with target breaker bars spaced from the rotor, and an improved support assembly for each end of an adjustably positioned target breaker bar having end portions projecting through horizontally extended oblong openings in sidewalls of said housing; and said support assembly comprising: a. an arm having a bushing at one end connected at a right angle to said projecting bar end portion, with an end of said arm opposite said bushing being threaded and projecting horizontally away from said rotor and beyond said sidewall opening; b. a shear block with a central bore through which the threaded end portion of the arm projects; c. a plurality of shims on said arm between said bushing and said shear block; d. a threaded nut turned on the end of the arm projecting through the shear block and clamping said shims between said bushing and said shear block; e. a channel fitted over the shear block, having an open end directed horizontally toward and attached to the adjacent housing sidewall to define a box surrounding and holding the shear block against rotation about the arm; and f. a pair of parallel shear pins arranged in a vertical plane and on opposite sides of the arm, with each shear pin having its ends journaled in said box and a midportion thereof extending through a bore in the shear block to hold the shear block against axial movement within said box unless and until said shear pins are sheared by overload force applied to the supported target bar by such as uncrushable material.
Claim 3
Dependent Claim 32 words
A crusher according to claim 1 in which said shear block is rectangular, and said channel is a U-shaped assembly of walls loosely holding the shear block against the adjacent housing sidewall.
Claim 4
Dependent Claim 68 words
A crusher according to claim 1 in which said arm is connected to the projecting bar end portion by a cap member connected to the arm and fitted over the end of the bar to engage the circumference thereof, whereby when the nut is turned on the arm to move away from the shear block, the target breaker bar can be moved toward and away from the rotor.
Claim 5
Dependent Claim 51 words
A crusher according to claim 2 in which shear pins are arranged in horizontal positions with one above the arm and one below the arm, and one end of each pin is journaled in said adjacent housing sidewall and the other end of each pin journaled in the U-shaped channel assembly.
Claim 6
Dependent Claim 62 words
A crusher according to claim 4 in which each shear pin has two axially spaced circumferential shear grooves with one shear groove of each pin substantially coplanar with the vertical side of said shear block adjacent said housing wall and the other shear groove of each pin substantially coplanar with the vertical side of said shear block remote from said housing wall.

References Cited (Backward Citations)

US2525795A Cited
FR1274059A Cited
US3295773A Cited
US3455517A Cited
US3701485A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-11-11 1978-05-13 1978-11-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-11-11 1982-05-13 1982-11-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-11-11 1986-05-13 1986-11-12 $7700.00 Window Closed / Lapsed

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