# US 4,392,698 A · Industrial crane with rotary electrical connector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,392,698 A - Document ID: US4392698A - Status: Granted - Kind: A - Application number: 06/221,389 - Filed: 1980-12-30 - Granted: 1983-07-12 - Earliest claimed: 1980-12-30 - Assignees: JLG Industries, Inc. - Inventors: Lex A. Mellott - Web page: https://patentgrep.com/patent/US4392698A ## CPC - B66C 23/84: Slewing gear (anti-friction bearings F16C) - B66C 13/12: Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices - H02G 11/00: Arrangements of electric cables or lines between relatively-movable parts - B66C: CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES ({specially adapted for lifting invalids A61G7/10;} rope, cable, or chain winding mechanisms, braking or detent devices therefor B66D; specially adapted for nuclear reactors G21) - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES ## Abstract A vehicle having a chassis and a rotatable upper works is provided with a cylindrical electrical connector mounted remote from the axis of rotation of the upper works, to provide adequate ground clearance. ## Claims ### Claim 1 A vehicle comprising: (a) a chassis, an upper works, means mounting the upper works for rotation on the chassis about a vertical axis, and means for rotating said upper works, (b) cylindrical electrical connector means for tranferring electrical energy between a fixed element and a rotary element and including a fixed part, a rotary part, and axially spaced conductor bands and contacts on said parts, (c) means mounting said connector means on said chassis remote from the axis of rotation of the upper works, (d) means for rotating said rotary part of said connector means from said upper works, (e) flexible electrical conductors extending through a hollow shaft and connected to said connector means and to electrical means on said upper works. ### Claim 2 (depends on 1) The combination of claim 1, said means for rotating the rotary part of the connector means comprising a hollow, flexible shaft. ### Claim 3 (depends on 1) The combination of claim 1, said connector mounting means mounting said connector means with the axis thereof substantially horizontal. ### Claim 4 (depends on 1, 2) The combination of claim 1 or 2, said vehicle further comprising a rotary oil coupling having its axis on the axis of the upper works and comprising a fixed part and a rotary part, means connecting the fixed part to the chassis, means connecting the rotary part to the upper works for movement therewith, conduit means connected to said fixed and rotary parts and means connecting said flexible hollow shaft to the rotary part of the rotary oil coupling. ### Claim 5 (depends on 1) The vehicle of claim 1, said upper works comprising a cab, said vehicle further comprising second electrical means on said chassis, and conductors connecting said last mentioned second electrical means and said contacts of said electrical connector means. ### Claim 6 A vehicle comprising: (a) a chassis supported on longitudinally spaced wheels, (b) an upper works rotatable on said chassis, (c) electrical components on said upper works and on said chassis, (d) means for connecting said electrical components comprising: (i) a cylindrical electric connector including a plurality of axially spaced conductor bands and a plurality contacts engaging said bands, said connector comprising a rotary part supporting said bands, (ii) a plurality of electrical conductors connected to said components on said upper works and to said conductor bands, (iii) a plurality of electrical conductors connected to said contacts and to said electrical components on said chassis, (e) means for effecting rotation of said rotary part of said electrical connector, and (f) means for mounting said electrical connector on said chassis spaced from the axis of rotation of said upper works. ### Claim 7 (depends on 6) The structure of claim 6, said means for effecting rotation of said rotary part comprising a hollow, flexible shaft having one end coaxial with the axis of rotation of the upper works and the other end spaced from said axis and connected to said rotary part of said electrical connector. ### Claim 8 (depends on 7) The structure of claim 7, said first mentioned plurality of electrical conductors being flexible and extending through said hollow, flexible shaft. ### Claim 9 (depends on 6) The structure of claim 6, said last mentioned means mounting said electrical connector in horizontal position. ### Claim 10 (depends on 6) The vehicle of claim 6, and a rotary oil coupling having a first part fixed to said chassis and a second part fixed to said upper works and rotatable therewith; means mounting said rotary oil coupling with its axis coincident with the axis of rotation of the upper works, and means connecting said one end of said flexible shaft with said second part of rotary coupling. ### Claim 11 (depends on 10) The structure of claim 10, said rotary oil coupling second part having an axial passage therethrough, said first mentioned electrical conductors extending through said axial passage. ### Claim 12 (depends on 10, 11) The structure of claim 10 or 11, and hydraulic hoses connected to said first and second parts of said oil coupling.