US3752328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile derrick
Assignee: MCCABE POWERS BODY Co
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Filing: 1971-11-09
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Granted: 1973-08-14
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Expires: 1991-11-09
Abstract
Abstract A mobile derrick includes a chassis frame and a mast frame having a rectangular front section rigidly mounted on the chassis frame. A mast is rigidly secured to the mast frame by means of a cross-beam provided at one end of the rectangular front section such that the mast extends upwardly therefrom for supporting a derrick at its upper end. A body is mounted over the chassis frame in a manner which permits it to be free from rigid connection with the mast so as to allow the mast, mast frame, and chassis frame to deflect independently of the body.
Inventors
- 👤 R Balogh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:00
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/18; B66C23/36; B62; B62D; B62D37/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
223 words
A mobile derrick for a vehicle comprising an elongated chassis and a vehicle body supported by said chassis, said chassis being drawn by said vehicle, said chassis having an elongated longitudinal axis and including opposite longitudinal end portions, an elongated beam member provided on said chassis separate from said vehicle body and being rigidly mounte across said chassis at one of said longitudinal end portions, said beam member having a cutout portion and an elongated lateral axis intersecting the longitudinal axis of said chassis, said derrick further including an elongated derrick mast having a polygonal periphery extending upwardly through the cutout portion in said beam member, said cutout portion being of complementary crosssection with the polygonal periphery of said derrick mast such that the periphery of the cutout portion in said beam member embraces a predetermined length of the polygonal periphery of said derrick mast in keylike fashion whereby the engagement of said cutout portion and the predetermined length of said derrick mast resists twisting of said derrick mast with respect to said beam, said derrick mast being rigidly secured within the cutout portion in said beam membr such that said derrick mast is nondisplaceable vertically within the cutout portion of said beam member and stresses imposed on said derrick are transmitted through said derrick mast to said beam member and said chassis.
Claim 2
Dependent Claim
223 words
A mobile derrick for a vehicle comprising an elongated chassis and a vehicle body supported by said chassis, said chassis being drawn by said vehicle, said chassis having an elongated longitudinal axis and including opposite longitudinal end portions, an elongated beam member provided on said chassis separate from said vehicle body and being rigidly mounte across said chassis at one of said longitudinal end portions, said beam member having a cutout portion and an elongated lateral axis intersecting the longitudinal axis of said chassis, said derrick further including an elongated derrick mast having a polygonal periphery extending upwardly through the cutout portion in said beam member, said cutout portion being of complementary crosssection with the polygonal periphery of said derrick mast such that the periphery of the cutout portion in said beam member embraces a predetermined length of the polygonal periphery of said derrick mast in keylike fashion whereby the engagement of said cutout portion and the predetermined length of said derrick mast resists twisting of said derrick mast with respect to said beam, said derrick mast being rigidly secured within the cutout portion in said beam membr such that said derrick mast is nondisplaceable vertically within the cutout portion of said beam member and stresses imposed on said derrick are transmitted through said derrick mast to said beam member and said chassis.
Claim 3
Dependent Claim
35 words
A mobile derrick as claimed in claim 1, said derrick mast including a tail portion extension depending from said beam member such that twisting movement of said tail portion extension is restrained by said chassis.
Claim 4
Dependent Claim
78 words
A mobile derrick as claimed in claim 2, wherein said chassis includes spaced side support members, said derrick further including rigid stabilizer means disposed between the tail portion of said derrick mast and one of said chasses side support members such that one portion of Said stabilizer means abuts said chassis and another portion of said stabilizer means abuts said tail portion to restrain twisting of said derrick mast with respect to said beam member and said chassis.
Claim 5
Dependent Claim
22 words
A mobile derrick as claimed in claim 1 wherein said derrick mast and said tail portion extension are of generally rectangular cross-section.
Claim 6
Dependent Claim
45 words
A mobile derrick as claimed in claim 4, wherein the abutting portions of said stabilizer means include spaced bearing surfaces arranged to abut said derrick mast and said chassis to restrain said derrick mast from twisting with respect to said beam member and said chassis.
Claim 7
Dependent Claim
23 words
A mobile derrick as claimed in claim 3, wherein said stabilizer means is a channel having opposite side portions constituting said abutting portions.
Claim 8
Dependent Claim
41 words
A mobile derrick as claimed in claim 2, wherein a first end of said beam member extends transversely beyond one of the side support memers of said chassis, said derrick mast extending upwardly through said beam member at said first end.
Claim 9
Dependent Claim
47 words
A mobile derrick as claimed in claim 7, wherein said derrick mast is spaced from said chassis, said derrick further including stabilizer means disposed in the space between said derrick mast and said chassis to restrain twisting of said derrick mast with respect to said beam member.
Claim 10
Dependent Claim
48 words
A mobile derrick as claimed in claim 8, wherein said stabilizer means include a rigid bearing member having one side portion abutting the tail portion of said derrick mast and another side portion abutting said chassis to restrain twisting of said derrick mast with respect to said chassis.
Claim 11
Dependent Claim
22 words
A mobile derrick as claimed in claim 9 wherein said derrick mast and said tail portion extension are of generally rectangular cross-section.
Claim 12
Dependent Claim
45 words
A mobile derrick as claimed in claim 10, wherein the abutting portions of said stabilizer means include spaced bearing surfaces arranged to abut said derrick mast and said chassis to restrain said derrick mast from twisting with respect to said beam member and said chassis.
Claim 13
Dependent Claim
23 words
A mobile derrick as claimed in claim 9, wherein said bearing member is a channel having opposite side portions constituting said abutting portions.
Claim 14
Dependent Claim
57 words
A mobile derrick as claimed in claim 1, further including connecting means for rigidly securing said beam member to said chassis, said connecting means comprising an L-shaped plate having one leg disposed between said beam member and said chassis for mutual securance thereto, the other leg portion being anchored to said chassis remote from said beam member.
Claim 15
Dependent Claim
19 words
A mobile derrick as claimed in claim 1, wherein said beam member is hollow having a substantially rectangular cross-section.
Claim 16
Dependent Claim
33 words
A mobile derrick as claimed in claim 14, wherein said beam member includes an internal bracing member diagonally arranged therein and having opposite ends secured to opposite side walls of said beam member.
Claim 17
Dependent Claim
47 words
A mobile derrick as claimed in claim 1, wherein a second end of said beam member extends transversely beyond one of the side support members of said chassis, said derrick including articulated outrigger means provided at said second end of said beam member for stabilizing said derrick.
Claim 18
Dependent Claim
35 words
A mobile derrick as claimed in claim 1, further including a mast frame rigidly mounted to said chassis and extending from said beam member longitudinally of said chassis toward the other said longitudinal end portion.
Claim 19
Dependent Claim
44 words
A mobile derrick as claimed in claim 1, wherein said mast frame includes opposite end portions, one of said end portions being rigidly secured to said beam member, said mast frame further including connecting means for rigidly securing said mast frame to said chassis.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |