Saw Gear Box

A multi-speed transmission gear for a concrete cutting saw, comprising:

• a. an input shaft, comprising:
• i. a first elongated body having a first end, and a second end opposite the first end,
• ii. a first outer surface having a first splined portion extending from the first end of the first elongated body of the input shaft towards the second end of the first elongated body of the input shaft, and
• iii. a first slot at the second end of the first elongated body;
• b. a top slider gear operatively connectable to the input shaft, wherein the top slider gear is generally bolt shaped, the top slider gear comprising:
• i. top slider gear shaft defining a first longitudinal axis, the top slider gear shaft having a first end, and a second end opposite the first end, the first longitudinal axis running through the first and second ends of the top slider gear,
• ii. a first central channel defined by a first inner surface extending from the first end to the second end of the top slider gear shaft and concentric about the first longitudinal axis, wherein the first inner surface of the top slider gear shaft comprises a first splined surface configured to mate with the first splined portion of the input shaft,
• iii. a first toothed disk at the first end of the top slider gear shaft, the first toothed disk having a first size,
• iv. a second toothed disk at the second end of the top slider gear shaft, the second toothed disk having a second size, wherein the second size is larger than the first size,
• v. a body portion defined by a smooth outer surface, the body portion in between and separating the first toothed disk and the second toothed disk, and
• vi. a first circumferential groove along the smooth outer surface of the body portion adjacent to the first toothed disk portion;
• c. a top shifter fork operatively connected to the top slider gear at the first circumferential groove, the top shifter fork comprising:
• i. a first rod having a first end and a second end, and
• ii. a first forked head, the first forked head defined by two arms converging at an elbow at approximately right angles, wherein the elbow is attached to the second end of the first rod, and wherein the first forked head is configured to fit within the first circumferential groove;
• d. an idler gear, comprising:
• i. an idler gear shaft defining a second longitudinal axis, the idler gear shaft having a first end and a second end opposite the first end, the second longitudinal axis running through the first and second ends of the idler gear shaft,
• ii. a third toothed disk at the first end of the idler gear shaft, the third toothed disk having a third size,
• iii. a fourth toothed disk on the idler gear shaft adjacent to the third toothed disk, the fourth toothed disk having a fourth size,
• iv. a fifth toothed disk at the second end of the idler gear shaft, the fifth toothed disk having a fifth size, wherein the third size is greater than the fourth size, and the fourth size is greater than the fifth size, and
• v. a main gap defined in between the fourth toothed disk and the fifth toothed disk;
• e. a bottom slider gear adjacent to the idler gear, the bottom slider gear comprising:
• i. a bottom slider gear shaft defining a third longitudinal axis, the bottom slider gear shalt having a first end and a second end opposite the first end, the third longitudinal axis running through the first and second ends of the bottom slider gear shaft,
• ii. a second central channel defined by a second inner surface extending from the first end to the second end of the bottom slider gear shaft, and concentric about the third longitudinal axis, wherein the second inner surface comprises a second splined surface,
• iii. a sixth toothed disk at the first end of the bottom slider gear shaft, the sixth toothed disk having a sixth size,
• iv. a seventh toothed disk at the second end of the bottom slider gear shaft, the seventh toothed disk having a seventh size, wherein the sixth size is smaller than the seventh size, and
• v. a second circumferential groove between the first end of the bottom slider gear shaft and the sixth toothed disk;
• f. an output shaft, comprising:
• i. a second elongated body having a first end, and a second end opposite the first end,
• ii. a second outer surface having a second splined portion in between the first end of the second elongated body and the second end of the second elongated body of the output shaft, wherein the second splined portion of the output shaft is configured to mate with the second splined surface of the bottom slider gear,
• iii. a second slot at the first end of the second elongated body, and
• iv. a third slot at the second end of the second elongated body;
• and
• g. a bottom shifter fork operatively connected to the bottom slider gear at the second circumferential groove, the bottom shifter fork comprising:
• i. a second rod having a first end and a second end;
• and
• ii. a second forked head, comprising a plate attached to an arcuate arm, the plate attached to the second end of the second rod, and the arcuate arm configured to fit with the second circumferential groove.