referring to fig1 of the drawings , a cutting apparatus devised in accordance with the present invention and generally indicated by the reference numeral 10 , is shown attached to a garden type tractor 12 , which has a seat 13 provided for carrying the operator of the tractor . tractor 12 generally is referred to as a riding mower but may also be in the form of a regular farm tractor . for large tractors , the cutting apparatus may be enlarged for the cutting of weeds , brush , small trees and the like . as shown in fig3 a for example , the cutting apparatus 10 includes a wheeled vehicle or trailer designated generally by the numeral 14 . as shown in fig1 for example , trailer 14 preferably has a trailer frame 15 , which extends beneath and supports a horizontal platform 16 . trailer frame 15 preferably has a plurality of rotatable wheels 18 disposed beneath platform 16 and supporting frame 15 and platform 16 above the ground . trailer frame 15 preferably is pivotally and detachably mountable to tractor 12 . as shown in fig3 a for example , trailer frame 15 includes a tongue 20 to which is attached at one end a clevis 22 . as shown in fig1 for example , a pin 24 detachably connects clevis 22 to a trailer hitch 26 carried at the rear end frame of tractor 12 . in accordance with the present invention , a cutter boom frame is provided . as shown in fig1 and 3b for example , a cutter boom frame is designated generally by the numeral 34 . as shown in fig3 b for example , boom frame 34 preferably includes at least two extrusions 36 , 38 extending the length of boom 34 . a plurality of crosspieces 37 extend between and rigidly connect extrusions 36 , 38 , which as shown in fig4 for example can be formed of hollow metal tubing such as steel or aluminum tubing . crosspieces 37 can be attached to extrusions 36 , 38 by welding or conventional mechanical fasteners to form a sturdy rigid boom 34 . in accordance with the present invention , the cutter boom frame is pivotally carried by the trailer . accordingly , a pivot member is carried by trailer 14 and is rotatable with respect to one of the trailer frame and the boom frame and nonrotatable with respect to the other of the trailer frame and the boom frame . in the embodiment shown in fig2 and 4 for example , the pivot member includes a shaft 30 , which has a lower end rotatably mounted on platform 16 about shaft 30 &# 39 ; s vertically disposed axis 46 of rotation . as shown in fig4 a u - shaped bracket 32 is secured to the opposite and upper end of rotatable shaft 30 . as shown in fig3 b and 4 for example , each of elongated structural members 36 , 38 , of frame 34 is formed with a respective depending flange element 40 , 42 . each flange element 40 , 42 has an aligned opening through which a pivot pin 44 projects and is carried rotatably with respect to the longitudinal axis of pivot pin 44 . the legs of the u - shaped bracket 32 are similarly formed with aligned openings and are arranged to rotatably receive the pin 44 for engaging boom frame 34 nonrotatably with respect to axis 46 and shaft 30 , but rotatably with respect to the longitudinal axis of pivot pin 44 . in another embodiment illustrated in the figures , the pivot member carried by trailer 14 can be made rotatable about axis 46 with respect to the boom frame and nonrotatable with respect to the trailer frame . for example , shaft 30 can be nonrotatably carried by platform 16 , and u - shaped bracket 32 can be rotatably mounted about axis 46 on the upper end of shaft 30 . in accordance with the present invention , means is provided for cutting vegetation , such as grass , weeds , light brush and the like . the cutting means preferably is mounted on or suspended from one end of cutter boom frame 34 . preferably , the cutting means includes a cutter apparatus of the rotary blade type that is pivotally mounted vertically for application to lawns or other areas and vegetation to be cut . for example , a rotary cutter blade apparatus generally indicated in fig2 by the reference numeral 60 is mounted at one end of the boom frame 34 . as shown in fig2 and 3c for example , cutter apparatus 60 comprises a rotary cutter blade 62 mounted for rotation within a conventional housing guard 64 held in a horizontal orientation by a plurality of depending posts 66 secured to a plate 68 mounted at one outer end of the boom frame 34 . the cutter blade 62 is mounted at the lower end of a cutter blade shaft 70 pivotally supported by the plate 68 by any suitable means not shown . at the upper end of the shaft 70 , a pulley 72 is secured for imparting operational rotation to the cutter blade 62 . in further accordance with the present invention , means is provided for supplying power for imparting cutting action to the cutting means . preferably , the power means is mounted near the end of the boom frame opposite the end near which the cutting means is mounted . as shown in fig1 and 3b for example , a support frame 52 is mounted to the end of boom frame 34 opposite the end carrying the cutting means . support frame 52 carries an internal combustion engine 54 , such as a gasoline powered motor . as shown in fig2 for example , in order to impart rotation to a cutting means pulley 72 and a blade 62 connected thereto , pulley 72 is operatively connected by a belt 74 to a drive pulley 76 secured to a drive shaft 78 of engine 54 . in further accordance with the present invention , means is provided for pivoting the boom frame relative to the trailer frame over a range of from 0 to 280 degrees . preferably , the boom frame 34 is adapted for rotation in the horizontal plane about a vertically disposed axis 46 of the shaft 30 . the pivoting means preferably includes a pivot member such as shaft 30 . as shown in fig4 for example , pivot member 30 is nonrotatably related to boom frame 34 with respect to axis 46 by a pivot pin 44 . u - shaped bracket 32 is connected to flanges 40 , 42 , which depend respectively from extrusions 36 , 38 , by pivot pin 44 . the pivoting means further preferably includes a closed loop drive element that engages one of the pivot member and the boom frame , whereby rotation imparted by the drive element effects pivotal movement of the boom frame with respect to the trailer frame . as shown for example in fig3 a , the drive element preferably includes a plurality of links 97 joined together to form a chain 98 . the pivoting means still further preferably includes a drive mechanism that is nonrotatably related to the cutter boom frame so that rotation of the drive mechanism produces rotation of the boom frame . accordingly , a drive mechanism in the form of a pulley or sprocket 48 is nonrotatably mounted to either the pivot member 30 or the cutter boom frame 34 . in the embodiment shown in fig1 , 3a and 4 for example , sprocket wheel 48 is nonrotatably secured to the shaft 30 for rotation therewith about axis 46 . a rotational drive force imposed by drive element 98 upon the sprocket 48 in either direction , as shown by the arrow 50 in fig4 will induce corresponding rotation of the bracket 32 and the boom frame 34 about axis 46 . thus , the pivoting means provides the ability to rotate the boom frame 34 selectively in a horizontal plane from one side of the tractor 12 to the other side in a sweep extending over a range of more than 180 ° during a cutting operation . in further accordance with the present invention , means is provided for activating the pivoting means to selectively pivot the boom frame in a horizontal plane for moving the cutting means to selected cutting positions . preferably , the activating means is connected to the pivoting means and carried by the trailer frame near the tractor seat so as to be conveniently operable by the operator . as embodied herein and shown for example in fig2 the activating means preferably includes a manually operable cranking mechanism indicated generally by the numeral 90 . mechanism 90 is accessible to the operator while seated on the tractor and operating the cutting means . the cranking mechanism 90 includes a crank shaft 94 which is vertically disposed upon the end of the tongue 20 adjacent the tractor 12 and rotatably mounted thereon . a sprocket 92 is secured at the lower end of crank shaft 94 . the drive element also engages pulley or sprocket 92 rotatably mounted near the end of the trailer frame connected to the tractor . as embodied herein , chain 98 is operatively connected to the sprocket 92 and the sprocket 48 arranged on the trailer 14 . a suitable idler gear 102 may be utilized on trailer frame 15 to permit adjustment of the tension on the chain 98 . the pivoting means preferably is reversibly activated . to this end , the upper end of the crank shaft 94 is connected to a hand crank 100 arranged to be reached and be operated by an operator sitting on the tractor . the upper end of the shaft 94 projects through a hole formed in a bracket 96 which angles downwardly and is secured to the tongue 20 . cranking action by the operator in either directional rotation of the crank 100 effects corresponding rotation of the sprockets 92 and 48 , and therefore , the pivotal motion of the boom frame 34 . as previously stated , the extent of the pivotal sweep of the boom has a range of over 180 °, and preferably about 280 degrees , from one side of the tractor to the other side . in yet further accordance with the present invention , means are provided for permitting the raising and lowering of the cutting means . as shown for example in detail in fig4 the means for permitting the raising and lowering of the cutting means preferably includes a pivot pin 44 which connects flanges 40 , 42 , which depend respectively from extrusions 36 , 38 of boom frame 34 , for rotation relative to u - shaped bracket 32 about the longitudinal axis of pin 44 . bracket 32 thus supports cutter boom frame 34 for limited rotative movement relative to the axis of pivot pin 44 for permitting vertical movement of the ends of the boom frame , as indicated by the arrow 35 shown in fig4 . in order to support the end of boom 34 carrying the cutting means , and also to permit regulation of the height of the cutter blade 62 relative to the ground for controlling the height of vegetation to be cut , boom 34 preferably is provided with a swivel wheel apparatus 82 . swivel wheel apparatus 82 includes a vertical support post 84 which extends from beneath boom 34 . apparatus 82 further comprises a swivelable support wheel 86 which is arranged to depend from post 84 and to be swivelable with respect to the longitudinal axis of post 84 . thus , support wheel 86 supports the end of the cutter boom which carries the cutting means , for movement across the ground or area to be cut . in addition , swivelable wheel apparatus 82 ensures that the plane of the cutter blade is supported at the desired cutting height above the area to be cut . as embodied herein , post 84 and / or wheel 86 can be extended in telescopic fashion relative to boom frame 34 by any conventional means ( not shown in detail ) such as a rack and pinion device or a screw device for example . as shown for example in detail in fig4 bracket 32 supports cutter boom frame 34 for limited rotative movement relative to the axis of pivot pin 44 for permitting vertical movement of the ends of the boom frame as indicated by the arrow 35 . as noted in fig2 the structures carried by boom frame 34 are arranged so that boom frame 34 is balanced about its axis of vertical rotation about the pin 44 . the preferred balance is such that the power means biases the cutting means toward the ground . for example , engine 54 at one end of boom frame 34 biases the cutter device 60 and wheel apparatus 82 at the other end towards maintaining contact with the cutting plane and ground respectively . in this arrangement , the wheel apparatus 82 suffices as a single foot device , and a second foot device disposed beneath engine 54 becomes unnecessary to keep blade 62 in the proper cutting plane . the balanced arrangement of the present invention ensures that the cutting means remains facing the ground during height adjustments which accommodate height changes resulting from the traversal of different terrains during the cutting procedure . dangerous exposure of the cutting blade and unevenly cut areas are thereby avoided . to facilitate adjustments for maintenance of the desired balance , as shown in fig3 b , engine 54 is supported upon a plate 56 arranged for forward and rearward sliding movement within the frame 52 by means of an adjusting screw 58 , which is adjustably positionable relative to one end of the frame 52 . from the foregoing , it will be appreciated that the present invention comprises a minimum of parts which are simple in nature and low in cost . it will also be appreciated that the cutting apparatus may be quickly attached or detached from a tractor requiring no tools and a minimum of time , and that the full range of coverage of the rotary cutting mechanism is available to the operator while remaining in the sitting position on the tractor and while the same continues to move . while the invention has been explained with reference to the structures disclosed , it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope or spirit of the invention . the invention is not confined to the specific details set forth in the written description and drawings , which are provided to explain and illustrate the invention , not unduly limit it . thus , it is intended that the present invention cover whatever modifications and variations of this invention that come within the scope of the appended claims and their equivalents .
a lawn mowing apparatus is disclosed for use with a tractor or an auxiliary apparatus . the apparatus includes a trailer adapted to be connected to the hitch for the tractor , and a boom frame pivotally mounted on and above the trailer . one end of the boom frame supports an engine , while its other end supports a rotary cutting device operatively connected to the engine . a chain link drive element and sprockets engaged therewith effect pivoting movement of the boom frame relative to the trailer over about 280 ° sweep . a hand operated crank , operable by the rider on the tractor , is operatively connected to selectively pivot the boom frame to a desired position relative to the trailer . this effects swiveling movement of the frame in either direction and , consequently , selective movement of the rotary cutter device during a cutting operation . a pivot pin rotatably supports the boom frame for vertical movement of its opposite ends about the pivot pin . the weight of the engine biases the cutting device toward the ground , and a foot having a swiveling wheel maintains the cutting height of the cutting device .