US3829032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hammer assemblies with reversible tips for hammermills
Assignee: Cedarapids Inc
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Filing: 1972-10-02
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Granted: 1974-08-13
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Expires: 1992-10-02
Abstract
Abstract A hammer assembly for a hammermill employs a reversible hammer tip removably secured to the hammer arm by means of an interlocking joint, preferably of a generally T-shaped configuration. A large portion of the joint is formed by complementary tapered surfaces in order to ease removal of the tip after the joint has become ''''limed.'''' The remainder of the joint is formed by several pairs of complementary surfaces parallel to the swinging axis of the hammer assembly. These surfaces receive the centrifugal, centripetal and side crushing forces on the tip which otherwise would tend to separate the tip from the arm, especially before the joint has become limed, owing to the tapered portions of the joint. A wire clip temporarily interlocks the arm and the tip until liming of the joint is sufficient to retain the tip on the arm.
Inventors
- 👤 V Schrimper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:50
CPC Classifications
B; B02; B02C; B02C13/00; B02C13/26; B02C13/28
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
321 words
In a two piece hammer assembly for a hammermill, the assembly including a hammer arm and a reversible hammer tip, the hammer arm having radially inner and outer ends, the inner end including a hub for attaching the arm to a hammermill for swinging movement of the arm about a first axis extending transversely of the arm and perpendicular to a second axis of the arm extending longitudinally thereof and radially with respect to the first axis, the tip including a pair of opposite end walls disposed transversely of the first axis and joined by at least one side wall for crushing material, the outer end of the arm and the hammer tip including an interlocking joint between and opening through at least one of the tip end walls for retaining the tip on the arm during operation of the manner assembly in a hammermill and for sliding removal of the tip from the arm in a direction generally parallel to the first axis, the improvement wherein the joint comprises a plurality of pairs of complementary surfaces on the tip and the outer end of the arm between the tip end walls, first ones of the surfaces receiving centrifugal forces on the tip, second ones of the surfaces receiving centripetal forces on the tip, third ones of the surfaces receiving crushing forces on the side walls of the tip, and fourth ones of the surfaces convergingly tapering with respect to each other in a direction from the one tip end wall toward the other to form a wedge-like relation of the tip to the arm in order to facilitate removal of the tip, the first, second and third surfaces being substantially parallel to the first axis and respectively receiving substantially all of said forces during at least initial operation of the hammer assembly, the fourth surfaces having a greater area than any of the other three complementary surfaces of the joint.
Claim 2
Dependent Claim
321 words
In a two piece hammer assembly for a hammermill, the assembly including a hammer arm and a reversible hammer tip, the hammer arm having radially inner and outer ends, the inner end including a hub for attaching the arm to a hammermill for swinging movement of the arm about a first axis extending transversely of the arm and perpendicular to a second axis of the arm extending longitudinally thereof and radially with respect to the first axis, the tip including a pair of opposite end walls disposed transversely of the first axis and joined by at least one side wall for crushing material, the outer end of the arm and the hammer tip including an interlocking joint between and opening through at least one of the tip end walls for retaining the tip on the arm during operation of the manner assembly in a hammermill and for sliding removal of the tip from the arm in a direction generally parallel to the first axis, the improvement wherein the joint comprises a plurality of pairs of complementary surfaces on the tip and the outer end of the arm between the tip end walls, first ones of the surfaces receiving centrifugal forces on the tip, second ones of the surfaces receiving centripetal forces on the tip, third ones of the surfaces receiving crushing forces on the side walls of the tip, and fourth ones of the surfaces convergingly tapering with respect to each other in a direction from the one tip end wall toward the other to form a wedge-like relation of the tip to the arm in order to facilitate removal of the tip, the first, second and third surfaces being substantially parallel to the first axis and respectively receiving substantially all of said forces during at least initial operation of the hammer assembly, the fourth surfaces having a greater area than any of the other three complementary surfaces of the joint.
Claim 3
Dependent Claim
24 words
The assembly of claim 1 including separate means for locking the tip on the outer arm end during initial operation of the hammer assembly.
Claim 4
Dependent Claim
70 words
The assembly of claim 1 wherein the joint is of generally T-shaped configuration including a stroke portion along the second axis and a cross portion transversely of the second axis, the cross portion having first areas to each side of the stroke portion forming the first surfaces and second areas radially outward of the first areas forming the second surfaces, the cross portion having additional areas forming the fourth surfaces.
Claim 5
Dependent Claim
26 words
The assembly of claim 3 wherein each of the stroke portion and the cross portion includes two pairs of opposite areas together forming the third surfaces.
Claim 6
Dependent Claim
67 words
The assembly of claim 4 including separate means for locking the tip on the outer arm end during initial operation of the hammer assembly, the locking means interlocking the third surfaces and comprising a generally U-shaped wire member, each leg portion of the member being received in a pair of complementary grooves in one pair of the third surfaces, the grooves extending transversely of the first axis.
Claim 7
Dependent Claim
132 words
The assembly of claim 2 wherein the joint is of generally T-shaped configuration, the arm forming the stroke portion and the outer arm end being extended laterally from the stroke portion in the plane of its swinging movement to form the cross portion, the tip being complementarily recessed to fittingly receive the stroke and cross portion of the arm and form the joint, radially inner areas of the cross portion to each side of the stroke portion and the complementary areas of the tip recess forming the first surfaces, part of the radially outer area of the cross portion and the complementary area of the tip recess forming the second surfaces, and wherein the area of the fourth surfaces is greater than the combined areas of the first, second and third surfaces.
Claim 8
Dependent Claim
96 words
The assembly of claim 6 wherein opposite areas of the stroke and cross portions of the arm and the complementary areas of the tip recess form four pairs of the third surfaces and wherein the second surfaces are centrally disposed with respect to the ends of the cross portion, the remainder of the radially outer areas of the cross portion and the complementary areas of the tip recess to each side of the second surfaces being arcuately curved in the plane of swinging movement of the arm toward the first surfaces and forming the fourth surfaces.
Claim 9
Dependent Claim
49 words
The assembly of claim 7 wherein the blocking means comprises A generally U-shaped wire member and a pair of complementary grooves in each pair of the third surfaces extending transversely of the first axis, the legs of the member being inserted and retained in respective pairs of the grooves.
Claim 10
Dependent Claim
228 words
A removable and reversible tip for one end of a hammermill arm adapted to be swung at its other end about an axis comprising: a generally block-like member having opposite side walls parallel to said axis for crushing material and joined by opposite end walls, a top wall, and a bottom wall arcuately formed between the side walls; and inverted T-shaped recess in the tip member extending longitudinally of the tip side walls and having stroke and cross portions, the recess opening through at least one tip end wall and through its top wall to form the stroke portion, the opposing side walls of the stroke portion and the opposite side walls of the cross portion of the tip recess being generally parallel to said axis, the cross portion of the tip recess having a lower wall and a pair of upper walls respectively adjoining the stroke side walls and generally parallel to said axis, the cross portion lower wall having a floor below and centrally disposed between the stroke portion side walls parallel to said axis, the remainder of the cross portion lower wall being convergingly tapered from the one tip end wall toward the other and having an area greater than the combined area of the stroke and cross portion side walls, the cross portion upper walls and the floor of the cross portion lower wall.
Claim 11
Dependent Claim
228 words
A removable and reversible tip for one end of a hammermill arm adapted to be swung at its other end about an axis comprising: a generally block-like member having opposite side walls parallel to said axis for crushing material and joined by opposite end walls, a top wall, and a bottom wall arcuately formed between the side walls; and inverted T-shaped recess in the tip member extending longitudinally of the tip side walls and having stroke and cross portions, the recess opening through at least one tip end wall and through its top wall to form the stroke portion, the opposing side walls of the stroke portion and the opposite side walls of the cross portion of the tip recess being generally parallel to said axis, the cross portion of the tip recess having a lower wall and a pair of upper walls respectively adjoining the stroke side walls and generally parallel to said axis, the cross portion lower wall having a floor below and centrally disposed between the stroke portion side walls parallel to said axis, the remainder of the cross portion lower wall being convergingly tapered from the one tip end wall toward the other and having an area greater than the combined area of the stroke and cross portion side walls, the cross portion upper walls and the floor of the cross portion lower wall.
Claim 12
Dependent Claim
34 words
The tip of claim 9 wherein the remainder of the cross portion lower wall is also arcuately curved upwardly from each side of the floor portion to adjoin the respective cross portion side walls.
Claim 13
Dependent Claim
46 words
The tip of claim 10 wherein at least the cross portion also opens through the other tip end wall and the stroke portion side walls are provided with a pair of opposite grooves extending from the tip top wall to the respective cross portion upper walls.
Claim 14
Dependent Claim
202 words
A hammer arm for use in a hammermill, the arm being adapted to be journaled at its radially inner end for swinging movement about an axis, and to removably receive a replaceable tip at its radially outer end, the outer arm end being integrally enlarged to provide a T-shaped configuration having end walls extending transversely of said axis and cross and stroke portions, the cross portion of the outer arm end being formed by radially inner and outer facing walls extending between the end walls and from the outer arm end laterally of said axis, the stroke and cross portions of the outer arm end including pairs of side walls extending parallel to said axis, the radially outer wall including a step portion extending between the end walls and centrally disposed with respect to said axis, the radially outer face of the step portion and the radially inner wall being parallel to said axis, the remainder of the radially outer wall convergingly tapering from one end of the wall to the other and having an area greater than the combined areas of the cross portion inner wall, the stroke and cross portion side walls and the aforesaid face of the step portion.
Claim 15
Dependent Claim
202 words
A hammer arm for use in a hammermill, the arm being adapted to be journaled at its radially inner end for swinging movement about an axis, and to removably receive a replaceable tip at its radially outer end, the outer arm end being integrally enlarged to provide a T-shaped configuration having end walls extending transversely of said axis and cross and stroke portions, the cross portion of the outer arm end being formed by radially inner and outer facing walls extending between the end walls and from the outer arm end laterally of said axis, the stroke and cross portions of the outer arm end including pairs of side walls extending parallel to said axis, the radially outer wall including a step portion extending between the end walls and centrally disposed with respect to said axis, the radially outer face of the step portion and the radially inner wall being parallel to said axis, the remainder of the radially outer wall convergingly tapering from one end of the wall to the other and having an area greater than the combined areas of the cross portion inner wall, the stroke and cross portion side walls and the aforesaid face of the step portion.
Claim 16
Dependent Claim
32 words
The arm of claim 12 wherein the remainder of the radially outer wall is also arcuately curved from each side of the step portion to adjoin the respective cross portion side walls.
Claim 17
Dependent Claim
39 words
The arm of claim 13 wherein the stroke side walls also extend laterally from the arm to overhang one of the end walls and are provided with a pair of opposite grooves therein extending thereacross transversely of said axis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |