A crane having a rotatable boom arm and selective mounting means, said crane comprising:
- a rotatable boom arm supported atop said crane, said boom arm pivoting selectively about any horizontal axis;
- a vertical central column supporting said boom arm and having a first flange projecting radially therefrom and a lower extension extending below said first flange, said lower extension being round in cross section and having a diameter;
- a receptacle including an upwardly oriented socket being round in cross section and having a bottom wall and a diameter just greater than said lower extension diameter, said socket cooperating with said column lower extension, wherein said column is rotatably retained within said receptacle;
- said receptacle further comprising,
- a second flange projecting radially therefrom and being axially aligned with said socket and said first flange, and washer means conforming to a shape of said first flange and being faced with polytetrafluoroethylene, said washer means also including a central opening therein, thereby enabling penetration of said column lower extension therethrough, said washer means lying between said first and second flanges, wherein said column is constrained against downward motion into said socket upon abutment of said washer means with said first and second flanges,
- at least one shorter horizontal projection and at least two longer horizontal projections secured to said receptacle and projecting radially therefrom, said longer and shorter projections having cross sectional configuration other than round, said shorter and longer horizontal projections including means defining a hole therethrough, wherein a telescoping member cooperating with said horizontal projections in telescoping fashion is constrained against axial relative rotation therewith and further is releasably secured to said projections by projection hand pins;
- said selective mounting means further comprising one member for selectively attaching, steadying, and supporting said crane, telescoping over at least one of said shorter and longer horizontal projections and being secured thereto by additional hand pins, and being attachable, in turn, to anchoring means selectively resting upon an environmental surface and attachable to an environmental surface and to a vehicle chassis;
- said receptacle substantially surrounding said column lower extension, wherein said column is supported and maintained in upright orientation by said receptacle, and
- said column and boom arm being rotatable through 360 degrees of rotation, wherein said crane can lift a load in a first location and lower the load in a second location.