Patent GB2204014A successfully refreshed from Google Patents.
GB2204014A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
Slew control system
Assignee: SCOTT JCB Ltd
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Filing: 1987-04-29
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Granted: —
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Expires: 2007-04-29
Abstract
Abstract A slew control system for an excavator having a superstructure rotatably mounted on a chassis comprises first and second detectors positioned at circumferential locations on one of the superstructure or chassis and a marker located on the other of the chassis or superstructure. The marker and the detectors produce a signal at a predetermined limit of slew to divert power from the slew drive motor. The motor is preferably hydraulic and is controlled by a spool valve (40) in response to an operators handle (42) via lines (44a, 44b). Solenoid diverter valves (46a, 46b) are provided to disable the slew motor in the event of slewing to a limit defined by the detectors such as proximity switches (30). A slew brake (50) is activated simultaneously. <IMAGE>
Inventors
- 👤 Robert Howard Johnstone
- 👤 Stuart Edward Taylor
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-10-30 03:30
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/88; B66C23/94; E; E02; E02F; E02F9/00; E02F9/08; E02F9/10; E02F9/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
A slew control system for a machine having a chassis and a superstructure which can be slewed relative to the chassis by means of a slew motor, the system comprising first and second detector means positioned at predetermined circumferential locations on one of the chassis and superstructure, marker means at a predetermined circumferential location on the other of the chassis and superstructure, the detector means and marker means cooperating to produce a detector output when a respective detector means is aligned with the marker means, and diverter means in a power supply to the slew motor responsive to the detector means to divert power from the slew motor on the occurrence of a detector output.
Claim 2
Dependent Claim
115 words
A slew control system for a machine having a chassis and a superstructure which can be slewed relative to the chassis by means of a slew motor, the system comprising first and second detector means positioned at predetermined circumferential locations on one of the chassis and superstructure, marker means at a predetermined circumferential location on the other of the chassis and superstructure, the detector means and marker means cooperating to produce a detector output when a respective detector means is aligned with the marker means, and diverter means in a power supply to the slew motor responsive to the detector means to divert power from the slew motor on the occurrence of a detector output.
Claim 3
Dependent Claim
33 words
The system of claim 1, in which the slew motor is a hydraulic motor with a hydraulic servo control, and the diverter means comprises diverter valves in the right and left servo lines.
Claim 4
Dependent Claim
52 words
The system of claim 2, in which the machine includes a slew brake which is biased on and hydraulically powered off, and the system comprises a further diverter valve in the hydraulic supply to the slew brake, the further diverter valve operating in response to outputs from either of the detector means.
Claim 5
Dependent Claim
52 words
The system of claim 2 or claim 3, in which the diverter valves are solenoid valves which are powered to a position permitting slewing, and are controlled by the detector means via relays which are arranged to cut out in the event that the main power source of the machine becomes inoperative.
Claim 6
Independent Claim
15 words
The system of any preceding claim, in which the detector means comprises magnetic proximity switches.
Claim 7
Dependent Claim
26 words
The system of -claim 5, in which said switches are mounted on brackets adapted to be secured beneath bolts mounting a ring bearing of the machine.
Claim 8
Dependent Claim
17 words
A slew control system substantially as herein described with reference to and as illustrated in the drawings.
Claim 9
Dependent Claim
17 words
A slew control system substantially as herein described with reference to and as illustrated in the drawings.
References Cited (Backward Citations)
GB941833A
Cited
GB1178520A
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GB1440614A
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GB1432574A
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GB2092099A
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GB2092097A
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