LUBRICATION RETENTION APPARATUS FOR POWER TOOL
First Claim
1. A gearbox for a handheld power tool, including:
- a housing including a recess having a wall section;
a main gear disposed within the recess and including a plurality of gear teeth;
a drive gear engaged with the main gear for driving the main gear; and
means for retaining lubricant within the housing for improved retention of the lubricant on the main gear, the means for retaining being configured to create a localized pressure reduction within the housing during operation of the power tool.
1 Assignment
0 Petitions
Accused Products
Abstract
A gearbox is provided for a handheld power tool. The gearbox includes a housing including a recess having a wall section, a main gear disposed within the recess and including a plurality of gear teeth, and a drive gear engaged with the main gear for driving the main gear. The gearbox also includes means for retaining lubricant within the housing for improved retention of the lubricant on the main gear. The means for retaining is configured to create a localized pressure reduction within the housing during operation of the power tool. In one example, a portion of the wall section curves towards the main gear, and a localized pressure reduction is formed proximate the minimum distance between the curving wall section and the main gear during operation of the power tool.
17 Citations
20 Claims
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1. A gearbox for a handheld power tool, including:
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a housing including a recess having a wall section; a main gear disposed within the recess and including a plurality of gear teeth; a drive gear engaged with the main gear for driving the main gear; and means for retaining lubricant within the housing for improved retention of the lubricant on the main gear, the means for retaining being configured to create a localized pressure reduction within the housing during operation of the power tool. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A gearbox for a handheld power tool, including:
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a housing including a recess having a wall section; a main gear disposed within the recess and including a plurality of gear teeth; a drive gear engaged with the main gear for driving the main gear; and a lubricant disposed within the housing for lubricating the main gear, a portion of the wall section curving towards the main gear and a localized pressure reduction being formed proximate the minimum distance between the curving wall section and the main gear during operation of the power tool for improved retention of the lubricant on the main gear. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A gearbox for a handheld power tool, including:
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a housing including a recess having a wall section; a main gear disposed within the recess and including a plurality of gear teeth and a pair of cams; a drive gear engaged with the main gear for driving the main gear; a pair of cutting blades, each cutting blade being configured to engage one of the cams, rotation of the main gear causing rotation of the cams to thereby cause the cutting blades to move in a reciprocal manner; and means for retaining lubricant within the housing for improved retention of the lubricant on the main gear, the means for retaining being configured to create a localized pressure reduction within the housing during operation of the power tool. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification