Patent US3896887A successfully refreshed from Google Patents.
US3896887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mounting for drill rig mast
Assignee: Gardner Denver Inc
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Filing: 1973-12-26
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Granted: 1975-07-29
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Expires: 1993-12-26
Abstract
Abstract A blast hole drill rig has a main frame turnably mounted on a mobile undercarriage and includes a mast support member mounted on the frame for limited pivotal movement about a horizontal axis. A horizontally displaceable boom formed as a massive beam is slidably supported on the support member and is reversibly displaceable with respect to the support member by a hydraulic piston and cylinder type actuator. An elongated mast is mounted on a support bracket which in turn is pivotally connected to one end of the boom and is pivotable by a pair of side-by-side hydraulic cylinder actuators interconnecting the boom and the support bracket.
Inventors
- 👤 Malcolm N Council
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:31
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B15/00; E21B15/04; E21B19/00; E21B19/08; E21B19/086; Y; Y10; Y10S; Y10S173/00; Y10S173/03
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
In a mobile drill rig including an undercarriage, a frame mounted on said undercarriage, and an elongated mast including a drill motor mounted for movement along said mast for driving a drill stem, an improved mounting for said mast comprising: a support mounted on said frame and comprising a cradle member including a pair of spaced apart legs pivotally connected to said frame for limited movement about a horizontal pivot axis formed by said pivotal connection, said support being disposed between a pair of extensible hydraulic cylinders connected to said frame and said support for positioning said support about said horizontal pivot axis; an elongated boom mounted on said support for linear movement substantially parallel to said horizontal pivot axis; and, a positioner bracket pivotally mounted on one end of said boom and connected to said mast whereby said mast may be pivoted with respect to said boom.
Claim 2
Dependent Claim
148 words
In a mobile drill rig including an undercarriage, a frame mounted on said undercarriage, and an elongated mast including a drill motor mounted for movement along said mast for driving a drill stem, an improved mounting for said mast comprising: a support mounted on said frame and comprising a cradle member including a pair of spaced apart legs pivotally connected to said frame for limited movement about a horizontal pivot axis formed by said pivotal connection, said support being disposed between a pair of extensible hydraulic cylinders connected to said frame and said support for positioning said support about said horizontal pivot axis; an elongated boom mounted on said support for linear movement substantially parallel to said horizontal pivot axis; and, a positioner bracket pivotally mounted on one end of said boom and connected to said mast whereby said mast may be pivoted with respect to said boom.
Claim 3
Dependent Claim
38 words
The invention set forth in claim 1 wherein: said support includes a member removably fastened to said cradle member and said support includes bearing means disposed on said member and said cradle member for slidably supporting said boom.
Claim 4
Dependent Claim
30 words
The invention set forth in claim 2 wherein: said bearing means comprises a plurality of bearing blocks disposed on said member and said cradle member, said bearing blocks being self-lubricating.
Claim 5
Dependent Claim
142 words
In a mobile drill rig including an undercarriage, a frame mounted on said undercarriage, and an elongated mast including a drill motor mounted for movement along said mast for driving a drill stem, an improved mounting for said mast comprising: a support mounted on said frame for limited movement about a horizontal pivot axis; an elongated boom comprising a pair of side-by-side elongated tubular members fixed together by webs interposed between said tubular members, and mounted on said support for linear movement substantially parallel to said horizontal pivot axis; a positioner bracket pivotally mounted on one end of said boom and connected to said mast whereby said mast may be pivoted with respect to said boom; and, a pair of extensible hydraulic cylinders mounted side by side, each cylinder being connected to one of said tubular members and to said positioner bracket.
Claim 6
Dependent Claim
142 words
In a mobile drill rig including an undercarriage, a frame mounted on said undercarriage, and an elongated mast including a drill motor mounted for movement along said mast for driving a drill stem, an improved mounting for said mast comprising: a support mounted on said frame for limited movement about a horizontal pivot axis; an elongated boom comprising a pair of side-by-side elongated tubular members fixed together by webs interposed between said tubular members, and mounted on said support for linear movement substantially parallel to said horizontal pivot axis; a positioner bracket pivotally mounted on one end of said boom and connected to said mast whereby said mast may be pivoted with respect to said boom; and, a pair of extensible hydraulic cylinders mounted side by side, each cylinder being connected to one of said tubular members and to said positioner bracket.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |