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US 2026/0124730 A1Published application
Power tool with multispeed transmission
AssigneeBlack & Decker Inc.
InventorsRobert S. GEHRET, David C. TOMAYKO, Heather SCHAFER, Joseph Patrick KELLEHER, Joseph Carl BISER, Trevor J. KOENIG
Life of this patent
Estimating the term…
Abstract
A multi-speed, power-driven tool may include a transmission mechanism that transmits power from a motor to an output device. A speed selection mechanism may be coupled to the transmission mechanism, to control a speed reduction through the transmission mechanism, and an output speed of the tool. The transmission mechanism may employ a compound, stepped, planetary gear assembly. The speed selection mechanism may employ a compliant speed selection mechanism.
Claims20
A multi-speed power tool comprising:
- a housing;
- a motor received in the housing;
- a multi-speed planetary transmission rotationally driven by the motor and defining a transmission axis, wherein the multi-speed transmission includes a plurality of sub-sections each of which is configured to provide an intermediate speed reduction when that subsection is active,
- an output shaft rotationally driven by the transmission at an output rotational speed defined by intermediate speed reductions of any of the active subsections;
- and
- a speed selector including a shift member inside the housing that is moveable among a first plurality of positions where the shift member engages a one or more of the subsections of the transmission to activate one or more of the subjections so as to cause the transmission to rotate the output shaft at a plurality of different output rotational speeds, a switch accessible from outside the housing, coupled to the shift member, and moveable among a second plurality of positions corresponding to selected output speeds of the transmission to cause movement of the shift member among the first plurality of positions;
- and a plurality of springs disposed in parallel between the shift member and the switch without any of the plurality of springs arranged serially, the plurality of springs exerting a bi-directional biasing force on the shift member in both an axial forward and an axial rearward direction relative to the switch,
- wherein if the switch is moved from a first switch position to a second switch position of the second plurality of positions and the shift member is blocked from moving from the a first speed position to a second speed position of the first plurality of positions, the shift member remains stationary and when the shift member is later unblocked from moving from the first speed position to the second speed position, a force provided by the plurality of springs urge the shift member to move to the second speed position while the switch remains stationary.
5 more elements
A multi-speed power tool, comprising:
- a housing;
- a motor received in the housing;
- a multi-speed planetary transmission rotationally driven by the motor and defining a transmission axis, wherein the multi-speed transmission includes a plurality of subsections, each of the plurality of subsections being configured to produce a corresponding speed reduction;
- an output shaft rotationally driven by the transmission;
- and
- a speed selector moveable among a plurality of positions in which the speed selector engages one or more of the plurality of subsections of the transmission so as to cause the transmission to rotate the output shaft at a plurality of different output speeds, wherein the speed selector comprises:
- a switch that is accessible from an outside of the housing, and that is movable within an opening formed in the housing;
- and
- at least one shift rail having a first end portion fixed to the switch and a second end portion fixed to a shift member that selectively engages one of the plurality of subsections of the transmission,
- wherein the switch includes:
- a base portion having a first side portion coupled to the at least one shift rail;
- a shutter slidably coupled on a second side portion of the base portion, opposite the first side portion thereof;
- and
- a grasping portion extending from the base portion through an opening formed in the shutter, wherein the grasping portion is movable to a plurality of different positions between a first end of the opening in the housing and a second end of the opening in the housing, the plurality of different positions corresponding to a plurality of different axial positions of the shifter with respect to the transmission.
11 more elements
Dependencies are inferred from the claim text.