Patent US3620579A successfully refreshed from Google Patents.
US3620579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extensible boom assembly
Assignee: AMERICAN CRANE Corp A CORP OF
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Filing: 1969-06-13
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Granted: 1971-11-16
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Expires: 1989-06-13
Abstract
Abstract A truck-mounted boom assembly having a plurality of telescopic boom sections. Each boom section has right angle corner members secured to top, bottom and sideplates. Rockable friction pads slidably associated with adjacent corner sections mount the boom sections for movement relative to each other. A plurality of fluid pressure cylinder units located within the boom assembly are operable to selectively extend and contract the boom assembly by moving the boom sections relative to each other.
Inventors
- 👤 Archer W Brown
- 👤 James L Montgomery
- 👤 Lorraine V Erkenbrack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:04
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/705
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
115 words
A boom assembly comprising: a plurality of telescopic arranged boom sections, each boom section having an elongated right-angle member at each corner thereof, each angle member being a rolled member having generally normally disposed flanges, each flange having an elongated inwardly directed linear step along the outer end thereof forming an elongated linear pocket, elongated plates extended between adjacent angle members forming the sides, top, and bottom of the boom section, said plates having linear side portions located in the pockets in the flanges, attaching means securing the side portions of the plates to the flanges, and wear pad means located between and only in engagement with the corner members of the adjacent boom sections.
Claim 2
Dependent Claim
115 words
A boom assembly comprising: a plurality of telescopic arranged boom sections, each boom section having an elongated right-angle member at each corner thereof, each angle member being a rolled member having generally normally disposed flanges, each flange having an elongated inwardly directed linear step along the outer end thereof forming an elongated linear pocket, elongated plates extended between adjacent angle members forming the sides, top, and bottom of the boom section, said plates having linear side portions located in the pockets in the flanges, attaching means securing the side portions of the plates to the flanges, and wear pad means located between and only in engagement with the corner members of the adjacent boom sections.
Claim 3
Dependent Claim
21 words
The boom assembly of claim 1 wherein: the attaching means comprise linear welds to secure the corner members to the plates.
Claim 4
Dependent Claim
22 words
The boom assembly of claim 2 wherein: each corner flange has an outwardly directed bevel edge providing a groove for the weld.
Claim 5
Dependent Claim
24 words
The boom assembly of claim 2 wherein: said linear welds are located in the steps used to secure the corner members to the plates.
Claim 6
Dependent Claim
20 words
The boom assembly of claim 1 wherein: each corner member has a thickness greater than the thickness of the plates.
Claim 7
Dependent Claim
44 words
The boom assembly of claim 1 wherein: the wear pad means comprise block members, each block member having a flat surface in sliding surface contact with one corner member and a convex face opposite the flat surface in engagement with the other corner member.
Claim 8
Dependent Claim
29 words
The boom assembly of claim 6 including: retaining means secured to said other corner member to confine the block member for limited rocking movement on the other corner member.
Claim 9
Dependent Claim
45 words
The boom assembly of claim 1 wherein: the wear pad means comprise a first pair of wear pads located between and in engagement with the lower corner members and a second pair of wear pads located between and in engagement with the upper corner members.
Claim 10
Dependent Claim
40 words
The boom assembly of claim 8 wherein: each wear pad has a flat surface in sliding surface contact with a movable corner member and a longitudinally convex face opposite the flat face surface in engagement with the other corner member.
Claim 11
Dependent Claim
28 words
The boom assembly of claim 9 including: retaining means secured to the corner member to confine the wear pad for limited rocking movement on the other corner member.
Claim 12
Dependent Claim
106 words
A boom assembly comprising: a plurality of telescopic arranged boom sections, each boom section having an elongated linear corner member at each corner thereof, each member having generally normally disposed portions, each portion having an elongated inwardly directed linear step along the outer end thereof forming an elongated linear pocket, and elongated plate means having edges extended generally parallel to and adjacent the corner members, said edges located in the pockets in the portion, attaching means for securing said edges to the adjacent portions of the corner members, and wear pad means located between and only in engagement with the corner members of adjacent boom sections.
Claim 13
Dependent Claim
106 words
A boom assembly comprising: a plurality of telescopic arranged boom sections, each boom section having an elongated linear corner member at each corner thereof, each member having generally normally disposed portions, each portion having an elongated inwardly directed linear step along the outer end thereof forming an elongated linear pocket, and elongated plate means having edges extended generally parallel to and adjacent the corner members, said edges located in the pockets in the portion, attaching means for securing said edges to the adjacent portions of the corner members, and wear pad means located between and only in engagement with the corner members of adjacent boom sections.
Claim 14
Dependent Claim
35 words
The boom assembly of claim 11 wherein: said attaching means to secure the plate means to the corner members comprise linear welds located in the steps to secure the corner members to the plate means.
Claim 15
Dependent Claim
32 words
The boom assembly of claim 11 including: collar means surrounding at least a portion of each boom section and secured to the corner members and the plate means of the boom section.
Claim 16
Dependent Claim
21 words
The boom assembly of claim 11 wherein: each corner member has a thickness greater than the thickness of the plate means.
Claim 17
Dependent Claim
46 words
The boom assembly of claim 11 wherein: said wear pad means comprises block means having a flat surface in sliding surface contact with one corner member and a convex face opposite the flat face in rocking engagement with the corner member adjacent the one corner member.
Claim 18
Dependent Claim
26 words
The boom assembly of claim 15 wherein: the block means has a conveX face curved in the direction of movement of one of the corner members.
Claim 19
Dependent Claim
36 words
The boom assembly of claim 16 wherein: the block means is made of plastic material, and said convex face has a relatively large radius of curvature as compared to the longitudinal length of the block means.
Claim 20
Dependent Claim
41 words
The boom assembly of claim 15 wherein: said block means comprises a hard base member having a convex surface and pad means having a flat sliding outer surface, said pad means being secured to the base member opposite the convex surface.
Claim 21
Dependent Claim
24 words
The boom assembly of claim 15 including: retaining means secured to one corner member for holding the block means on the one corner member.
Claim 22
Dependent Claim
23 words
The boom assembly of claim 19 wherein: the retaining means comprise a generally U-shaped member located adjacent three sides of the block means.
Claim 23
Dependent Claim
60 words
The boom assembly of claim 1 wherein: said wear pad means comprises block means having a flat surface adapted to be located in sliding contact with one corner member and a convex face curved in the direction of movement of one of the corner members opposite the flat surface in engagement with the corner member adjacent the one corner member.
Claim 24
Dependent Claim
35 words
The boom assembly of claim 21 wherein: the block means is made of hard plastic material and said convex face has a relatively large radius of curvature compared to the length of the block means.
Claim 25
Dependent Claim
41 words
The boom assembly of claim 21 wherein: said block means comprises a hard base member having a convex surface and pad means having a flat sliding outer surface, said pad means being secured to the base member opposite the convex surface.
Claim 26
Dependent Claim
24 words
The boom assembly of claim 21 including: retaining means secured to one corner member for holding the block means on said one corner member.
Claim 27
Dependent Claim
23 words
The boom assembly of claim 24 wherein: the retaining means comprises a generally U-shaped member located adjacent three sides of the block means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |