Patent US2344068A successfully refreshed from Google Patents.
Patent US3815766A successfully refreshed from Google Patents.
US3815766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backhoe swing mechanism
Assignee: International Motors LLC
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Filing: 1971-03-11
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Granted: 1974-06-11
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Expires: 1991-03-11
Abstract
Abstract An apparatus for converting rectilinear motion to rotational motion about a first axis having two pivotal members fixed about and rotatable with respect to each other and to the first axis, two hydraulic motors interconnected between said pivotal members, a source of fluid power supply connected to each hydraulic motor by conduit means, directional flow control means for selectively delivering fluid power to the hydraulic motors, sequence valve means for sensing the position of the hydraulic motors and for directing flow to aid in obtaining a relatively constant torque output and angular velocity, bleeder valve means for reducing hydraulic input energy when the pivotal member is near the end of its rotation and for maintaining a maximum velocity potential throughout the rotational movement, and relief valve means for additionally controlling torque output.
Inventors
- 👤 E Carlson
- 👤 A Brudnak
- 👤 R Yeh
- 👤 R Sardiga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:57
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/20
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
263 words
In a backhoe having a support stand attached to a tractor, a swing support bracket pivotally connected to said support stand and supporting a boom, dipper stick and shovel of the backhoe with hydraulic motors for operation thereof, the improvement comprising: a. two hydraulic motors interconnected between the support stand and the said swing support bracket, each of said motors having a cylinder end and piston rod end, the cylinder end being pivotally connected to said support stand and the piston rod ends connected to the swing support bracket by a pivotal connection parallel to and spaced from said pivotal connection of the swing support bracket, b. a hydraulic circuit including a source of fluid pressure connected to each motor by conduit means leading from said tractor hydraulic system, c. directional flow control means operably connected to said conduit means for selectively delivering fluid pressure to the hydraulic motors whereby rectilinear expansion and contraction of the motors create rotational movement of the swing support member about its pivotal axis on the support stand, and d. sequence valve means are interposed in said conduit means between the directional flow control means and the hydraulic motors for sensing the position of the hydraulic motors as they rotate the support bracket about its pivotal connections and for directing fluid pressure sequenTially first to the head end of one motor only, then to both the cylinder end of said one motor and the rod end of the other motor, and then to both ends of said one motor and to the rod end of said other motor.
Claim 2
Dependent Claim
263 words
In a backhoe having a support stand attached to a tractor, a swing support bracket pivotally connected to said support stand and supporting a boom, dipper stick and shovel of the backhoe with hydraulic motors for operation thereof, the improvement comprising: a. two hydraulic motors interconnected between the support stand and the said swing support bracket, each of said motors having a cylinder end and piston rod end, the cylinder end being pivotally connected to said support stand and the piston rod ends connected to the swing support bracket by a pivotal connection parallel to and spaced from said pivotal connection of the swing support bracket, b. a hydraulic circuit including a source of fluid pressure connected to each motor by conduit means leading from said tractor hydraulic system, c. directional flow control means operably connected to said conduit means for selectively delivering fluid pressure to the hydraulic motors whereby rectilinear expansion and contraction of the motors create rotational movement of the swing support member about its pivotal axis on the support stand, and d. sequence valve means are interposed in said conduit means between the directional flow control means and the hydraulic motors for sensing the position of the hydraulic motors as they rotate the support bracket about its pivotal connections and for directing fluid pressure sequenTially first to the head end of one motor only, then to both the cylinder end of said one motor and the rod end of the other motor, and then to both ends of said one motor and to the rod end of said other motor.
Claim 3
Dependent Claim
69 words
An apparatus as recited in claim 1 wherein said sequence valve means comprises: a. two valve housings pivotally connected to the support stand, b. a spool connected to each of said hydraulic motors and disposed within said valve housings for reciprocal movement therein, said spool and said valve housing cooperative for controlling torque output delivered to the swing support member by directing flow to hydraulic motors in proper sequence.
Claim 4
Dependent Claim
38 words
An apparatus as defined in claim 1 in which relief valve means are interposed between said sequence valve means and said hydraulic motors for maintaining a minimum back pressure upon said motors to aid in controlling torque output.
Claim 5
Dependent Claim
46 words
An apparatus as defined in claim 1 in which: a. bleeder valve means are interposed between said sequence valve means and said directional flow control means for reducing fluid flow delivered to the hydraulic motors as the swing support bracket approaches the limit of its rotation.
Claim 6
Dependent Claim
51 words
An apparatus as defined in claim 4 in which said bleeder valve means comprises: a. a fixed orifice within said valve housing, b. a variable orifice in series therewith whereby an acceptable velocity potential is maintained toward the limit of the swing although the flow to the motors is gradually reduced.
Claim 7
Dependent Claim
221 words
In a backhoe, having a support stand adapted to be attached to a tractor, a swing support bracket pivotally connected to said support stand and supporting a boom, dipper stick, and implement with hydraulic motors for operation thereof, the improvement comprising: a. two hydraulic motors interconnected between the support stand and said swing support bracket, each of said motors having a cylinder end and a piston rod end, one end being attached to the support stand and the other ends being attached to the swing support bracket by pivotal connection parallel to and spaced from said pivotal connection of said swing support bracket so as to form a variable moment arm, b. hydraulic circuit means including a source of fluid energy connected to each motor by conduit means leading from said tractor hydraulic system, c. directional flow control means operably connected to said hydraulic circuit for selectively delivering fluid energy to the hydraulic motors, and d. sequence valve means interposed in said hydraulic circuit between said directional flow control means and said hydraulic rams for sensing the position of said swing support bracket and for directing fluid energy to appropriate ends of said hydraulic rams either independently or simultaneously so as to maintain a more constant effective moment arm so as to provide relatively constant torque output on the swing member.
Claim 8
Dependent Claim
221 words
In a backhoe, having a support stand adapted to be attached to a tractor, a swing support bracket pivotally connected to said support stand and supporting a boom, dipper stick, and implement with hydraulic motors for operation thereof, the improvement comprising: a. two hydraulic motors interconnected between the support stand and said swing support bracket, each of said motors having a cylinder end and a piston rod end, one end being attached to the support stand and the other ends being attached to the swing support bracket by pivotal connection parallel to and spaced from said pivotal connection of said swing support bracket so as to form a variable moment arm, b. hydraulic circuit means including a source of fluid energy connected to each motor by conduit means leading from said tractor hydraulic system, c. directional flow control means operably connected to said hydraulic circuit for selectively delivering fluid energy to the hydraulic motors, and d. sequence valve means interposed in said hydraulic circuit between said directional flow control means and said hydraulic rams for sensing the position of said swing support bracket and for directing fluid energy to appropriate ends of said hydraulic rams either independently or simultaneously so as to maintain a more constant effective moment arm so as to provide relatively constant torque output on the swing member.
Claim 9
Dependent Claim
42 words
An apparatus as recited in claim 6 in which said sequence valve means includes: a. check and relief valve means for opposing the exhaust fluid from the appropriate ends of said hydraulic motors so as to maintain said torque output more constant.
Claim 10
Dependent Claim
110 words
In a backhoe having a support stand attached to a tractor, a swing support bracket pivotally connected to said support stand and supporting earth working equipment for rotational movement, the improvement comprising: a. at least two hydraulic motors interconnected between said support stand, and said swing support bracket, b. fluid circuit means connected to said motors for delivering fluid energy thereto and including sequencing valves directing said energy sequentially first to one end of one motor only, then to both said one end and to the other end of the other motor and then to both ends of said one motor and to said other end of said other motor.
Claim 11
Dependent Claim
110 words
In a backhoe having a support stand attached to a tractor, a swing support bracket pivotally connected to said support stand and supporting earth working equipment for rotational movement, the improvement comprising: a. at least two hydraulic motors interconnected between said support stand, and said swing support bracket, b. fluid circuit means connected to said motors for delivering fluid energy thereto and including sequencing valves directing said energy sequentially first to one end of one motor only, then to both said one end and to the other end of the other motor and then to both ends of said one motor and to said other end of said other motor.
Claim 12
Dependent Claim
29 words
An apparatus as defined in claim 8, in which: a. exhaust limiting means are associated with said circuit means for controlling the torque delivered to saiD swing support bracket.
Claim 13
Dependent Claim
25 words
An apparatus as recited in claim 8 in which: a. exhaust limiting means are associated with said motors for controlling velocity of said swing assembly.
Claim 14
Dependent Claim
170 words
In a backhoe having a support stand attached to a tractor, a swing support bracket pivotally connected to said support stand about a vertical axis and supporting earth working equipment for rotational movement, the improvement comprising: a. hydraulic motor means interconnected between said support stand and said swing support bracket, said interconnection between the swing support bracket and said hydraulic motor means being on a vertical axis parallel to and displaced from the vertical axis connecting the swing support bracket and the support stand such that upon extension and retraction of the hydraulic motor means, the force applied to said swing support bracket by said motors is applied through a variable dimension lever arm, and b. fluid circuit means interconnected to said motors for delivering fluid energy thereto and including sequencing valves for directing said energy sequentially first to one motor and then to both motors so as to maintain the torque delivered to said swing support bracket more constant as the lever arm changes in response to rotational movement.
Claim 15
Dependent Claim
170 words
In a backhoe having a support stand attached to a tractor, a swing support bracket pivotally connected to said support stand about a vertical axis and supporting earth working equipment for rotational movement, the improvement comprising: a. hydraulic motor means interconnected between said support stand and said swing support bracket, said interconnection between the swing support bracket and said hydraulic motor means being on a vertical axis parallel to and displaced from the vertical axis connecting the swing support bracket and the support stand such that upon extension and retraction of the hydraulic motor means, the force applied to said swing support bracket by said motors is applied through a variable dimension lever arm, and b. fluid circuit means interconnected to said motors for delivering fluid energy thereto and including sequencing valves for directing said energy sequentially first to one motor and then to both motors so as to maintain the torque delivered to said swing support bracket more constant as the lever arm changes in response to rotational movement.
Claim 16
Dependent Claim
138 words
In a backhoe having a support stand attached to a tractor, a swing support bracket pivotally connected to said support stand and supporting earth working equipment for rotational movement, the improvement comprising: a. at least two hydraulic cylinders interconnected between said support stand and said swing support bracket for rotating said swing support stand through an arc of approximately 180*, b. fluid circuit means connected to said cylinders for delivering fluid energy thereto and including sequencing valves for directing fluid energy sequentially first to one motor throughout approximately one-third of the rotational movement of said swing support bracket, and then to both motors, said sequencing valves including valve means for directing fluid energy to both ends of one of said motors for limiting the velocity of said swing support bracket during the last one-third of its rotational travel.
Claim 17
Dependent Claim
138 words
In a backhoe having a support stand attached to a tractor, a swing support bracket pivotally connected to said support stand and supporting earth working equipment for rotational movement, the improvement comprising: a. at least two hydraulic cylinders interconnected between said support stand and said swing support bracket for rotating said swing support stand through an arc of approximately 180*, b. fluid circuit means connected to said cylinders for delivering fluid energy thereto and including sequencing valves for directing fluid energy sequentially first to one motor throughout approximately one-third of the rotational movement of said swing support bracket, and then to both motors, said sequencing valves including valve means for directing fluid energy to both ends of one of said motors for limiting the velocity of said swing support bracket during the last one-third of its rotational travel.
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |