초록 ▼

A spiked-bumper mounted to a forward end portion of a main body of a chain saw includes a reference mounting hole formed at one longitudinal end portion of the spiked-bumper, and mounting adjusting holes formed at a longitudinal opposite end portion of the spiked-bumper in positions located on an ar

A spiked-bumper mounted to a forward end portion of a main body of a chain saw includes a reference mounting hole formed at one longitudinal end portion of the spiked-bumper, and mounting adjusting holes formed at a longitudinal opposite end portion of the spiked-bumper in positions located on an arc constituting a part of an imaginary circle centered at the center of the reference mounting hole for adjusting the position in which the spiked-bumper is secured to the forward end portion of the main body of the chain saw.

대표청구항 ▼

1. An elongated spiked-bumper mounted to a forward end portion of a main body of a chain saw in a position adjacent and transverse to a guide bar for guiding a saw chain in its movement around an outer periphery of the guide bar, comprising: a mounting reference hole formed at one longitudinal en

1. An elongated spiked-bumper mounted to a forward end portion of a main body of a chain saw in a position adjacent and transverse to a guide bar for guiding a saw chain in its movement around an outer periphery of the guide bar, comprising: a mounting reference hole formed at one longitudinal end portion of the spiked-bumper for securing the spiked-bumper to the forward end portion of the main body of the chain saw beyond one edge of the guide bar; and at least one mounting adjusting hole formed at a lower longitudinal opposite end portion of the spiked-bumper, positioned beyond the other edge of the guide bar, said at least one mounting adjusting hole effectively extending on a short arc constituting a part of an imaginary circle which is centered at the center of the mounting reference hole for adjusting the position in which the spiked-bumper is secured to the forward end portion of the main body of the chain saw; wherein said spiked-bumper is rotably adjustable to move said lower longitudinal opposite end portion forward for sawing smaller trees. 2. A spiked-bumper as claimed in claim 1, wherein said at least one mounting adjusting hole comprises two round holes located in positions spaced apart from each other in the direction of the arc. 3. A spiked-bumper as claimed in claim 1, wherein said at least one mounting adjusting hole comprises a slot extending in the direction of the arc. 4. A spiked-bumper as claimed in claim 1, comprising at least two teeth extending outwardly from one side of the spiked-bumper near the longitudinal opposite end portion of the spiked-bumper at which said at least one mounting adjusting hole is formed, said teeth being shaped such that their tips are located on a substantially straight line. 5. An elongated spiked-bumper mounted to a forward end portion of a main body of a chain saw in a position adjacent and transverse to a guide bar for guiding a saw chain in its movement around an outer periphery of the guide bar, comprising: a mounting reference hole formed at an upper longitudinal end portion of the spiked-bumper for securing the spiked-bumper to the forward upper end portion of the main body of the chain saw; and adjusting hole means formed at a lower longitudinal opposite end portion of the spiked-bumper to provide a plurality of rigidly fixed mounting positions located on an arc constituting a part of an imaginary circle which is centered at the center of the mounting reference hole, for adjusting and rigidly fixing the position in which the spiked-bumper is secured to the forward bottom end portion of the main body of the chain saw, the length of the arc along which said bottom end portion of the spiked-bumper can move being smaller than the distance between the mounting reference hole and the arc; said elongated spiked-bumper having a number of teeth greater than three, and wherein the bottom three teeth are shaped such that their tips are located on a substantially straight line; wherein said spiked-bumper is rotably adjustable to move said lower longitudinal opposite end portion forward for sawing smaller trees.