Patent US3576268A successfully refreshed from Google Patents.
US3576268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Back hoe or grader
Assignee: SUVERKROP DON
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Filing: 1969-03-19
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Granted: 1971-04-27
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Expires: 1989-03-19
Abstract
Abstract A back hoe or grader has a base member pivotally supporting a boom, and a dipper pivotally mounted at the end of the boom, the effective lengths of the boom and dipper being equal. Separate hydraulic devices swing the boom about its pivotal support and swing the dipper relative to the boom, and the controls for these hydraulic devices may be selectively connected so that the angular rate of travel of the dipper with respect to the boom is substantially twice the angular rate of travel of the boom about its pivotal support. This limits the motion of the work implement connection at the outer end of the dipper so that it cannot move below a preselected straight line. Links pivotally connected to the work implement are also connected to a movable pivot on the boom, so that the attitude of the work implement may remain constant with respect to the dipper for back hoe operations, or constant with respect to the grade being cut for grading operations. A subframe is mounted for pivotal movement on the base member, and this subframe supports the hydraulic device for swinging the boom about its pivotal support. An additional hydraulic device swings the subframe relative to the base member.
Inventors
- 👤 Don Suverkrop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:47
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/28; E02F3/36; E02F3/42; E02F3/43; E02F3/435; E02F3/437; E02F3/3604; E02F3/3677; E02F3/38; E02F3/382
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
167 words
In a back hoe or grader, the combination of: a boom having a pivotal support at one end, a dipper having one end pivotally connected to the other end of the boom, a work implement including a lever, pivotal means at the other end of the dipper for connection to said lever, the boom and the dipper being of substantially the same length, power means for swinging the boom about its pivotal support, second power means for swinging the dipper with respect to the boom, means interconnecting said power means to coordinate their simultaneous action so that the angular rate of movement of the dipper with respect to the boom is substantially twice the angular rate of movement of the boom about its pivotal support, whereby the connection means for the work implement is caused to move in a straight line, pivot means on said boom, and a link connected at one end to said pivot means and pivotally connected at the other end to said lever.
Claim 2
Dependent Claim
167 words
In a back hoe or grader, the combination of: a boom having a pivotal support at one end, a dipper having one end pivotally connected to the other end of the boom, a work implement including a lever, pivotal means at the other end of the dipper for connection to said lever, the boom and the dipper being of substantially the same length, power means for swinging the boom about its pivotal support, second power means for swinging the dipper with respect to the boom, means interconnecting said power means to coordinate their simultaneous action so that the angular rate of movement of the dipper with respect to the boom is substantially twice the angular rate of movement of the boom about its pivotal support, whereby the connection means for the work implement is caused to move in a straight line, pivot means on said boom, and a link connected at one end to said pivot means and pivotally connected at the other end to said lever.
Claim 3
Dependent Claim
22 words
The combination set forth in claim 1 in which power means are provided for moving said pivot means relative to said boom.
Claim 4
Dependent Claim
204 words
In a back hoe or grader, the combination of: a base member, a boom mounted on the base member for movement in a vertical plane about a first pivot, a dipper mounted on the boom for movement in the same vertical plane about a second pivot, a work implement mounted at the swinging end of said dipper for movement about a third pivot, the distance between the first and second pivots being substantially equal to the distance between the second and third pivots, means including a first hydraulic cylinder assembly for swinging said boom with respect to said base member, means including a second hydraulic cylinder assembly for swinging said dipper with respect to said boom, means interconnecting said hydraulic cylinder assemblies to coordinate their simultaneous movements so that the dipper travels at substantially twice the angular rate about said second pivot as the boom travels about said first pivot, whereby the third pivot is caused to move in a straight line, said work implement including a lever connected to the dipper by means of said third pivot, pivot means on said boom, and a link connected at one end to said pivot means and pivotally connected at the other end to said lever.
Claim 5
Dependent Claim
204 words
In a back hoe or grader, the combination of: a base member, a boom mounted on the base member for movement in a vertical plane about a first pivot, a dipper mounted on the boom for movement in the same vertical plane about a second pivot, a work implement mounted at the swinging end of said dipper for movement about a third pivot, the distance between the first and second pivots being substantially equal to the distance between the second and third pivots, means including a first hydraulic cylinder assembly for swinging said boom with respect to said base member, means including a second hydraulic cylinder assembly for swinging said dipper with respect to said boom, means interconnecting said hydraulic cylinder assemblies to coordinate their simultaneous movements so that the dipper travels at substantially twice the angular rate about said second pivot as the boom travels about said first pivot, whereby the third pivot is caused to move in a straight line, said work implement including a lever connected to the dipper by means of said third pivot, pivot means on said boom, and a link connected at one end to said pivot means and pivotally connected at the other end to said lever.
Claim 6
Dependent Claim
22 words
The combination set forth in claim 3 in which power means are provided for moving said pivot means relative to said boom.
Claim 7
Dependent Claim
190 words
In a back hoe or grader, the combination of: a base member, a boom mounted on the base member for movement in a vertical plane about a first pivot, a dipper mounted on the boom for movement in the same vertical plane about a second pivot, a work implement mounted at the swinging end of said dipper for movement about a third pivot, the distance between the first and second pivots being substantially equal to the distance between the second and third pivots, means for swinging said boom with respect to said base member, said means including a subframe pivoted to said base member, means for swinging the subframe relative to the base member, a first hydraulic cylinder assembly operatively interposed between said subframe and said boom, means including a second hydraulic cylinder assembly for swinging said dipper with respect to said boom, and means interconnecting said hydraulic cylinder assemblies to coordinate their simultaneous movement so that the dipper travels at substantially twice the angular rate about said second pivot as the boom travels about said first pivot, whereby the third pivot is caused to move in a straight line.
Claim 8
Dependent Claim
190 words
In a back hoe or grader, the combination of: a base member, a boom mounted on the base member for movement in a vertical plane about a first pivot, a dipper mounted on the boom for movement in the same vertical plane about a second pivot, a work implement mounted at the swinging end of said dipper for movement about a third pivot, the distance between the first and second pivots being substantially equal to the distance between the second and third pivots, means for swinging said boom with respect to said base member, said means including a subframe pivoted to said base member, means for swinging the subframe relative to the base member, a first hydraulic cylinder assembly operatively interposed between said subframe and said boom, means including a second hydraulic cylinder assembly for swinging said dipper with respect to said boom, and means interconnecting said hydraulic cylinder assemblies to coordinate their simultaneous movement so that the dipper travels at substantially twice the angular rate about said second pivot as the boom travels about said first pivot, whereby the third pivot is caused to move in a straight line.
Claim 9
Dependent Claim
206 words
In a back hoe or grader, the combination of: a base member, a boom having a pivotal support at one end on the base member, a diPper having one end pivotally connected to the other end of the boom, means at the other end of the dipper for connection to a work implement, the boom and the dipper being of substantially the same length, power means on the base member for swinging the boom about its pivotal support, second power means for swinging the dipper with respect to the boom, and means interconnecting said power means to coordinate their simultaneous action so that the angular rate of movement of the dipper with respect to the boom is substantially twice the angular rate of movement of the boom about its pivotal support, said interconnecting means including a first sprocket coaxial with said pivotal support, a second sprocket coaxial with the pivotal connection between the boom and the dipper, and connected to turn with the dipper, the first sprocket having twice the effective diameter of the second sprocket, an endless chain connecting said sprockets, and means responsive to relative motion between the first sprocket and the base member for modifying the action of the first said power means.
Claim 10
Dependent Claim
206 words
In a back hoe or grader, the combination of: a base member, a boom having a pivotal support at one end on the base member, a diPper having one end pivotally connected to the other end of the boom, means at the other end of the dipper for connection to a work implement, the boom and the dipper being of substantially the same length, power means on the base member for swinging the boom about its pivotal support, second power means for swinging the dipper with respect to the boom, and means interconnecting said power means to coordinate their simultaneous action so that the angular rate of movement of the dipper with respect to the boom is substantially twice the angular rate of movement of the boom about its pivotal support, said interconnecting means including a first sprocket coaxial with said pivotal support, a second sprocket coaxial with the pivotal connection between the boom and the dipper, and connected to turn with the dipper, the first sprocket having twice the effective diameter of the second sprocket, an endless chain connecting said sprockets, and means responsive to relative motion between the first sprocket and the base member for modifying the action of the first said power means.
Claim 11
Dependent Claim
220 words
In a back hoe or grader, the combination of: a base member, a boom mounted on the base member for movement in a vertical plane about a first pivot, a dipper mounted on the boom for movement in the same vertical plane about a second pivot, a work implement mounted at the swinging end of said dipper for movement about a third pivot, the distance between the first and second pivots being substantially equal to the distance between the second and third pivots, means including a first hydraulic cylinder assembly for swinging said boom with respect to said base member, means including a second hydraulic cylinder assembly for swinging said dipper with respect to said boom, and means interconnecting said hydraulic cylinder assemblies to coordinate their simultaneous movements so that the dipper travels at substantially twice the angular rate about said second pivot as the boom travels about said first pivot, said interconnecting means including a first sprocket coaxial with said first pivot, a second sprocket coaxial with said second pivot and connected to turn with said dipper, the first sprocket having twice the effective diameter of the second sprocket, and endless chain connecting said sprockets, and means responsive to relative motion between the first sprocket and the base member for modifying the action of said first hydraulic cylinder assembly.
Claim 12
Dependent Claim
220 words
In a back hoe or grader, the combination of: a base member, a boom mounted on the base member for movement in a vertical plane about a first pivot, a dipper mounted on the boom for movement in the same vertical plane about a second pivot, a work implement mounted at the swinging end of said dipper for movement about a third pivot, the distance between the first and second pivots being substantially equal to the distance between the second and third pivots, means including a first hydraulic cylinder assembly for swinging said boom with respect to said base member, means including a second hydraulic cylinder assembly for swinging said dipper with respect to said boom, and means interconnecting said hydraulic cylinder assemblies to coordinate their simultaneous movements so that the dipper travels at substantially twice the angular rate about said second pivot as the boom travels about said first pivot, said interconnecting means including a first sprocket coaxial with said first pivot, a second sprocket coaxial with said second pivot and connected to turn with said dipper, the first sprocket having twice the effective diameter of the second sprocket, and endless chain connecting said sprockets, and means responsive to relative motion between the first sprocket and the base member for modifying the action of said first hydraulic cylinder assembly.
Claim 13
Dependent Claim
160 words
In a back hoe or grader, the combination of: a base member, a boom pivotally supported on the base member, a dipper pivotally connected to the boom, hydraulic power means on the base member for swinging the boom about its pivotal support, second hydraulic power means for swinging the dipper with respect to the boom, means for limiting the extent of pivotal motion of the boom in one direction, said means including a cam mounted to turn on the base member, means for turning the cam in accordance with movement of the second hydraulic power means, a follower adapted to contact the cam, support means for moving the follower in accordance with relative pivotal movement of the boom and the dipper, means including valve means for operating the first hydraulic means, said valve means including a servo pilot valve operatively interposed between said follower and its support means, whereby contact of the follower and cam opens the servo pilot valve.
Claim 14
Dependent Claim
160 words
In a back hoe or grader, the combination of: a base member, a boom pivotally supported on the base member, a dipper pivotally connected to the boom, hydraulic power means on the base member for swinging the boom about its pivotal support, second hydraulic power means for swinging the dipper with respect to the boom, means for limiting the extent of pivotal motion of the boom in one direction, said means including a cam mounted to turn on the base member, means for turning the cam in accordance with movement of the second hydraulic power means, a follower adapted to contact the cam, support means for moving the follower in accordance with relative pivotal movement of the boom and the dipper, means including valve means for operating the first hydraulic means, said valve means including a servo pilot valve operatively interposed between said follower and its support means, whereby contact of the follower and cam opens the servo pilot valve.
Claim 15
Dependent Claim
160 words
In a back hoe or grader, the combination of: a base member, a boom pivotally supported on the base member, a dipper pivotally connected to the boom and having a work implement on the swinging end thereof, hydraulic power means on the base member for swinging the boom about its pivotal support, second hydraulic power means for swinging the dipper with respect to the boom, a cam mounted to turn on the base member, means for turning the cam in accordance with movement of the second hydraulic power means, a follower adapted to contact the cam, support means for moving the follower in accordance with relative pivotal moveMent of the boom and the dipper, means including valve means for operating the first hydraulic means, said valve means including a servo pilot valve operatively interposed between said follower and its support means, whereby downward pivotal movement of the boom is limited by downward movement of the implement to a predetermined position.
Claim 16
Dependent Claim
160 words
In a back hoe or grader, the combination of: a base member, a boom pivotally supported on the base member, a dipper pivotally connected to the boom and having a work implement on the swinging end thereof, hydraulic power means on the base member for swinging the boom about its pivotal support, second hydraulic power means for swinging the dipper with respect to the boom, a cam mounted to turn on the base member, means for turning the cam in accordance with movement of the second hydraulic power means, a follower adapted to contact the cam, support means for moving the follower in accordance with relative pivotal moveMent of the boom and the dipper, means including valve means for operating the first hydraulic means, said valve means including a servo pilot valve operatively interposed between said follower and its support means, whereby downward pivotal movement of the boom is limited by downward movement of the implement to a predetermined position.
Claim 17
Dependent Claim
26 words
The combination set forth in claim 9 in which the follower support means includes an arm mounted to turn about the axis of the boom pivot.
Claim 18
Dependent Claim
71 words
The combination set forth in claim 9 in which the follower support means includes an arm mounted to turn about the axis of the boom pivot, a first circular member coaxial with the boom pivot and connected to drive the arm, a second circular member coaxial with the pivotal connection between the boom and the dipper and connected to turn with the dipper, and a flexible element connecting the circular members.
Claim 19
Dependent Claim
140 words
In combination, a base member, a first boom mounted on the base member for movement in a vertical plane about a first pivot, a second boom mounted on the first boom for movement in the same vertical plane about a second pivot, a work member mounted at the swinging end of the second boom for movement about a third pivot, the distance between the first and second pivots being substantially equal to the distance between the second and third pivots, a first circular member mounted coaxially of the first pivot, a second circular member mounted coaxially of said second pivot and connected to turn with said second boom, said first circular member having twice the effective diameter of said second circular member, a flexible element connecting said circular members, and means for limiting turning movement of said first circular member.
Claim 20
Dependent Claim
140 words
In combination, a base member, a first boom mounted on the base member for movement in a vertical plane about a first pivot, a second boom mounted on the first boom for movement in the same vertical plane about a second pivot, a work member mounted at the swinging end of the second boom for movement about a third pivot, the distance between the first and second pivots being substantially equal to the distance between the second and third pivots, a first circular member mounted coaxially of the first pivot, a second circular member mounted coaxially of said second pivot and connected to turn with said second boom, said first circular member having twice the effective diameter of said second circular member, a flexible element connecting said circular members, and means for limiting turning movement of said first circular member.
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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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |