Patent Application
20060070246
The reason for this invention is to provide an easier way to use a chainsaw for cutting down trees. Normal use of a chainsaw when cutting trees close to ground level puts stress on the user's knees and back. This invention reduces the stress.
It's a dual purpose device that cuts in a horizontal and a vertical position. With one pull of the rope the chainsaw changes angles for cutting in a horizontal position. Another pull of the rope and the chainsaw returns to the vertical position for cutting vertically. The chainsaw in the horizontal position is used to cut down trees. The chainsaw in the vertical position is used to prune, cut the felled trees into shorter lengths, and cut cord wood. It can also be modified to cut at any angle between horizontal and vertical by installing an adjustable locking bracket. The tension rope can be attached to a movable lever that when pulled would perform the same pivoting action as pulling the tension rope by the handle.
The chainsaw mounts to a main frame that has a platform for the user's foot when pulling the starting rope. It meets the chainsaw manufacturers' recommended safe starting position. The unit has one wheel which provides a single pivot point when cutting making it easier to maneuver between trees on uneven terrain. It pivots 90° without lifting the wheel. The single wheel is easy to use in heavy grass, and the balloon tires give more traction. A depth gauge is mounted on the frame providing protection for the chainsaw when cutting. The front lower frame in front of the chainsaw acts as a stop against the tree while cutting. The handle length puts the user far enough away from the cutting blade reducing the chance of being struck by flying wood chips, and also allows the operator to get in and cut under low hanging branches.
Detailed description of the invention with reference to
The two upper main frames are connected by three flat frame struts (spreaders) (18) and six frame spreader mounting brackets (20). The spreaders/struts (18) are sandwiched between the two flat plates of the six frame spreader mounting brackets (20) and bolted together at the bottom, middle, and top positions on the upper main frame (2). When all the spreaders/struts (18) are secured to the upper main frame (2), the upper main frame (2) becomes very rigid providing a solid frame on which the subsequent parts of the Flip-down Chainsaw cutter can be mounted.
The front platform plate (3) and the back platform plate (7) are bolted to the front and rear of the lower frame (1). The front and rear pivoting plates (12 and 13) are attached to the front and rear plates (3 and 7) by means of two heavy hinges (10) which provide a very strong and positive pivot point for mounting the chain saw.
The back and front saw supports (4 and 5) are then bolted in the proper position with the chainsaw pad on front support (4) in place which gives the chain saw a solid rest when in the vertical position. The upright locking plate (66) is then bolted in place with pivot bolt (9).
The Flip-down cutter gauge bracket/stop (43) is then bolted in place. This bracket keeps the chainsaw bar from coming in contact with the ground and also provides a solid rest for the chainsaw when cutting.
The main pivot bracket (47) is then bolted to the back pivoting mounting plate (13). This bracket rests on the back saw support (5) when the saw is in the upright (vertical) position. The main pivot plate (47) is threaded to receive the two ends of the threaded studs (66). This provides a solid anchor point for the rear chainsaw body. The lower pad for the chainsaw body (69) is placed over both studs using holes provided in the pad (69). Two rubber vibration/wear pads (65) are slid over the threaded studs (66) thus providing protection from wear on the chain saw body resulting from any vibration while saw is in use.
The chainsaw is then mounted to the front pivot plate (12 and 13). The front end of the chain saw is secured to the front pivot plate (12) by a rubber coated U-bolt (11). The U-bolt (11) is threaded on both ends and passes around the front chainsaw handle. A rubber vibration pad (63) is sandwiched between the U-bolt and pivot plate (12). The U-bolt (11) is then located in the appropriate mounting holes (70). The U-bolt (11) is then double nutted to reduce the chance of coming loose during cutting operations.
The rear chainsaw housing is placed between the two threaded studs (66) used for mounting rear body the chain saw to main pivot bracket (47) which is bolted to back pivoting mounting plate (13). The upper pad (67) for the rear chainsaw housing is placed over the threaded mounting studs. A metal plate (68) is placed over the mounting studs (66) and rest on pad (67). The plate (68) is secured to the threaded end of stud (66) by wing nuts (72). After the chainsaw is securely mounted to pivot plates (12 and 13), it becomes part of the pivot plates (12 and 13) and will pivot with the plates (12 and 13). The Flip-down cutter is made mobile by a wide wheel and a solid steel axle (25). The wheel is centered on the axle (25) and two axle locking collars (26) hold the axle centered. The axle is secured to the main upper frame (2) by axle support brackets (19). The brackets (19) are positioned on the main upper frame (2) so as to let the wheel (27) rest on the same plain as the bottom of main lower frame (1). This gives the Flip-down cutter a solid pivot point when engaging the throttle while cutting in a horizontal position.
When the chainsaw is rotated to the vertical position and rest on both the front (4) and the back support (5), the chainsaw can be locked in the vertical position with the upright locking bracket (6). This is accomplished by moving the steel locking rod (23) forward through the guides for locking rod (29). These guides are mounted on the flat frame struts/spreaders (18). The locking rod (29) has an offset bend on the lower end that hooks in the hole on the upright locking bracket (9). The locking rod (23) has a handle (24) on the upper end to accomplish the push-pull motion needed to lock or unlock the locking bracket (9). The locking bracket (9) is constructed in a way that when in the locking position, it extends over the lower end of the main pivot bracket (47) which locks the saw in an upright (vertical) position. In order to pivot the chain saw to the horizontal position, the locking bracket (9) must be moved to the none locking position. This is done by pulling back on the locking rod handle (24) thus moving the locking bracket (9) to a neutral position with the chainsaw securely mounted to the pivot plates, the throttle assembly (14) can then be attached to the chainsaw handle trigger (throttle).
Several parts are used in the construction of the throttle assembly (14). The throttle assembly is mounted to the upper throttle mounting control support plate (61) in a way that lets the chain saw operator control the throttle by means of a throttle control cable (32 and 33).
The throttle assembly (14) consists of three steel rods (55, 56, and 57). These rods pass through three holes in the upper throttle control support plate (61). The two outside rods (55 and 57) are threaded on one end and thread through the lower throttle plate (62) far enough to mount the throttle control stirrup (35). This stirrup (35) goes around the chainsaw trigger (throttle) in such a position as to make contact with the trigger. When the stirrup (35) is moved vertically, it engages the chainsaw trigger throttle. When disengaged, the chainsaw trigger throttle returns to an idle position.
In order to accomplish this, the throttle assembly (14) has a center throttle guide (56) which is threaded into the lower throttle control plate (62). This rod (56) passes through a throttle control spring (53) which is mounted between the upper throttle control plate (61) and the lower throttle control plate (62). This throttle control spring (53) lets the throttle return to the neutral (idle or off) position when required.
The throttle assembly also has a U-shaped throttle guide bracket (52) which keeps the upper throttle mounting control support (61) and the lower throttle control plate (62) in proper alignment when the throttle is engaged.
To engage the throttle on the chainsaw, it is necessary to move the lower section of the throttle assembly (62) upward. This is accomplished by pivoting the throttle tension bracket (54) off of the center throttle control guide (56) in a way that when either end is raised, it engages the throttle on the chainsaw. This is accomplished by using two throttle cables (32 and 33) that are attached to a handle (39 and 40) and to the throttle control bracket (54). The cables bolt to the throttle control bracket (54) with bolts (59). When the handles are compressed, this causes the throttle tension bracket to lift thus engaging the throttle on the chainsaw. When the handles are released, the throttle tension bracket (54) returns to a neutral position.
The throttle cables pass through a throttle cable guide/eyebolt (45) which is mounted to the bracket for mounting throttle cable and pivot rope guides (34). The throttle cable (33 ) for horizontal cutting is secured to the upper main frame (2) by a strap (42) positioned in such a way that it provides enough tension on the cable to engage the chainsaw trigger throttle. Throttle cable (33) is attached to the handle (39) on the right side of the upper main frame (2). Throttle cable (33) has sufficient length so the chainsaw can pivot 90° when cutting horizontally. Throttle cable (33) is longer than throttle cable (32) and can not be used when cutting in the vertical position. Therefore, the throttle cable (32) must be used for vertical cutting. Throttle cable (32) is in two sections and must be connected by hooking the upright throttle control connectors (41). This provides the correct tension on the throttle control bracket (54) for engaging the chainsaw throttle (trigger) while using the Flip-down cutter in the vertical (upright) position. Throttle cable (32) is attached to handle (40) which is mounted on the upper handle (37). Upper handle (37) is used to gain height for the chain bar when cutting in the vertical position without requiring the operator to bend too low.
The upper handle (37) is bolted to the upper main frame (2) which provides additional stability to the upper main frame (2). Upper handle (37) is used when moving the Flip-down cutter from one location to another as it gives the chain bar more height above the surface when pushed down to waist high position.
In order to use the Flip-down cutter in both the vertical and horizontal positions, a way must be provided to enable the operator to change from the vertical position to horizontal and from horizontal to the vertical position. This important operation is accomplished by pivot rope (15 and 16). The pivot rope (15 and 16) is secured to the eye bolt located on the lower outside of the bracket for mounting throttle cables and pivot rope guides (34). It then passes through a pivot guide (49) which is secured to the pivot tension bracket (17). This tension bracket (17) is bolted to the bottom flat frame strut (20).
The pivot tension bracket (17) is bent to an angle on the lower end that lets it extend to a height that is higher than the height of the pivot guide (46). The tension bracket (17) is bolted to the bottom flat frame strut (18) at an angle that lets the tension bracket (17) extend past the main upper frame (2) and rope guide (49) (eyebolt) is bolted to the tension bracket (17). Two rope guides (31 and 36) are bolted to the middle and upper flat frame struts (18). The pivot rope (15 and 16) passes through all three rope guides. When the tension rope (15 and 16) is attached to the eye bolt (46) and passes through guide (49) an angle is formed. This angle is great enough that when handle (60) is pulled, enough tension is created to lift the chainsaw from the horizontal position to vertical. By pulling the rope again, the saw will return to a horizontal position. It is easy for the operator to change cutting positions. While this is simple to perform, it is a very important part of the Flip-down chainsaw cutter making it very safe and easy to use.
| Number | Date | Country | |
|---|---|---|---|
| 60616131 | Oct 2004 | US |
