1. A power drill comprising:
a housing having a motor including an output member;
a rotary output spindle journaled in the housing;
a transmission disposed in the housing and including a first output gear and a second output gear that are moveable relative to one another along the output spindle, wherein the transmission selectively couples the output member to the output spindle through one of the first output gear or the second output gear for rotating the output spindle at one of a first speed or a second speed, respectively; and
a speed shift assembly comprising:
a guide plate that coordinates movement of the first and second output gears; and
a user engageable member that is movable between a first speed position, in which the first and second output gears are moved into respective first positions in which rotary power is transmitted through the first output gear but not through the second output gear, and a second speed position
in which the first and second output gears are moved into respective second positions in which rotary power is transmitted through the second output gear but not through the first output gear.
2. A power drill comprising:
a housing having a motor including an output member;
a rotary output spindle journaled in the housing;
a transmission disposed in the housing and including a first output gear and a second output gear, wherein the transmission selectively couples the output member to the output spindle through one of the first output gear or the second output gear for rotating the output spindle at one of a first speed or a second speed, respectively; and
a speed shift assembly comprising:
a guide plate that selectively influences movement of at least one of the first and second output gears; and
a user engageable member that is movable between a first speed position that corresponds to the first output gear being coupled for rotation with the output member and a second speed position that corresponds to the second output gear being coupled for rotation with the output member wherein movement between the first and second positions causes the second output gear to at least partially nest into the first output gear;
wherein the first output gear includes an annular depression that selectively receives an annular extension on the second output gear in a nested position.
3. The power drill of claim 2 wherein the first output gear includes a first circumferential sidewall and the second output gear includes a second circumferential sidewall, wherein the first circumferential sidewall at least partially surrounds the second circumferential sidewall in the nested position.
4. The power drill of claim 3 wherein more than half of an axial length of the second circumferential sidewall is nested into an axial length of the annular depression in the nested position.
5. The power drill of claim 4 wherein substantially about 90% of the axial length of the second circumferential sidewall is nested into the axial length of the annular depression in the nested position.
6. The power drill of claim 2, further comprising a biasing member disposed between the first and second output gears.
7. The power drill of claim 6 wherein the biasing member is configured to urge the first output gear away from the second output gear until complementary teeth on the first output gear and the output member align during engagement of the first output gear with the output member.
8. The power drill of claim 6 wherein the biasing member is configured to urge the second output gear away from the first output gear while complementary teeth on the second output gear and the output member align during engagement of the second output gear with the output member.
9. The power drill of claim 2 wherein the guide plate comprises a U-shaped body having opposing side flanges connected by an intermediate portion, wherein the opposing side flanges alternatively engage one of the first or second gears during shifting between the first and second speed positions, respectively.
10. The power drill of claim 9 wherein the intermediate portion defines a slot that is configured to receive an actuator pin associated with the user engageable member and wherein the actuator pin is guided along the slot during movement of the user engageable member between the first and second speed positions.
11. The power drill of claim 10 wherein the user engageable member comprises a knob configured for complete 360 degree rotation around an axis and wherein rotation of the knob influences linear translation of the guide plate along a guide rod during movement of the user engageable member between the first and second positions.
12. A power drill comprising:
a housing having a motor including an output member;
a rotary output spindle journaled in the housing;
a transmission disposed in the housing and including a first output gear and a second output gear, wherein the transmission selectively couples the output member to the output spindle through one of the first output gear or the second output gear for rotating the output spindle at one of a first speed or a second speed, respectively; and
a speed shift assembly comprising:
a guide plate that is slidably disposed along a guide rod, the guide plate configured to selectively and alternatively influence movement of the first and second output gears respectively; and
a biasing member journaled around the output spindle between the first and second output gears; and
a user engageable member that is movable between a first speed position that corresponds to the first output gear being coupled for rotation with the output member and a second speed position that corresponds to the second output gear being coupled for rotation with the output member wherein movement between the first and second positions causes the second output gear to at least partially nest into the first output gear against a biasing force of the biasing member.
13. The power drill of claim 12 wherein the first output gear includes an annular depression that selectively receives an annular extension on the second output gear in a nested position.
14. The power drill of claim 13 wherein the first output gear includes a first circumferential sidewall and the second output gear includes a second circumferential sidewall, wherein the first circumferential sidewall at least partially surrounds the second output gear in the nested position.
15. The power drill of claim 14 wherein more than half of the second circumferential sidewall is nested into the annular depression in the nested position.
16. The power drill of claim 13 wherein the biasing member is configured to urge the first output gear away from the second output gear while complementary teeth on the first output gear and the output member align during engagement of the first output gear with the output member and wherein the biasing member is configured to urge the second output gear away from the first output gear while complementary teeth on the second output gear and the output member align during engagement of the second output gear with the output member.
17. The power drill of claim 16 wherein the intermediate portion defines a slot that is configured to receive an actuator pin associated with the user engageable member and wherein the actuator pin is guided along the slot during movement of the user engageable member between the first and second speed positions.
18. The power drill of claim 17 wherein the user engageable member comprises a knob configured for complete 360 degree rotation around an axis and wherein rotation of the knob influences linear translation of the guide plate along a guide rod during movement of the user engageable member between the first and second positions.
19. A power drill comprising:
a housing having a motor including an output member;
a rotary output spindle journaled in the housing;
a transmission disposed in the housing and including a first output gear having a first axial thickness and a second output gear having a second axial thickness, wherein the transmission selectively couples the output member to the output spindle through one of the first output gear or the second output gear for rotating the output spindle at one of a first speed or a second speed, respectively; and
a speed shift assembly comprising:
a guide plate that is slidably disposed along a guide rod, the guide plate having first and second flanges that are configured to selectively and alternatively influence axial translation of the first and second output gears, respectively; and
a user engageable member that is movable between a first speed position that corresponds to the first output gear being coupled for rotation with the output member and a second speed position that corresponds to the second output gear being coupled for rotation with the output member wherein movement between the first and second positions causes the second output gear to occupy a nested position with the first output gear;
wherein an axial distance measured between an outermost surface of the first gear that opposes the first flange and an outermost surface of the second gear that opposes the second flange, while in the nested position, is less than a sum of the first and second axial thicknesses.
20. The power drill of claim 19 wherein the first output gear includes an annular depression that selectively receives an annular extension on the second output gear in a nested position.
21. The power drill of claim 20 wherein the outer dimension of first output gear includes a circumferential sidewall that at least partially surrounds the second output gear in the nested position.
22. The power drill of claim 20 wherein the biasing member is configured to urge the first output gear away from the second output gear while complementary teeth on the first output gear and the output member align during engagement of the first output gear with the output member and wherein the biasing member is configured to urge the second output gear away from the first output gear while complementary teeth on the second output gear and the output member align during engagement of the second output gear with the output member.
23. The power drill of claim 19 wherein the user engageable member comprises a knob configured for complete 360 degree rotation around an axis and wherein rotation of the knob influences linear translation of the guide plate along a guide rod during movement of the user engageable member between the first and second positions.
24. The power drill of claim 19, further comprising a rotatably fixed hammer member and a rotatable hammer member each mounted concentrically about the output spindle, the rotatable hammer member being mounted on the spindle to rotate therewith, the rotatable hammer member cooperating with the rotatably fixed hammer member to deliver vibratory impacts to the output spindle in a hammer drilling mode.
25. The power drill of claim 19, further comprising a spindle lock ring that surrounds the output spindle and defines a receiving portion that engages a motor pinion associated with the output member.
26. The power drill of claim 25 wherein the receiving portion defines a bore that at least partially receives a portion of the motor pinion.
27. The power drill of claim 1, further comprising a spring disposed between the first and second output gears, the spring biasing the first and second output gears apart from one another.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A lithium secondary battery comprising an electrode assembly composed of a cathode, an anode and a separator, and a lithium electrolyte, wherein the electrodes andor electrolyte include a compound (\u201curethane compound\u201d) andor polymer (\u201cpolyurethane\u201d) which are decomposed upon overcharge of the battery and contain a urethane group in a molecular structure thereof.
2. The battery according to claim 1, wherein the urethane compound or polyurethane is decomposed over 4.5 volts relative to a lithium redox potential.
3. The battery according to claim 1, wherein the content of the urethane compound or polyurethane is in the range of 0.1 to 20% by weight, based on the weight of the electrode or electrolyte.
4. The battery according to claim 1, wherein the urethane compound is added to a cathode andor electrolyte.
5. The battery according to claim 1, wherein the additive is polyurethane.
6. The battery according to claim 5, wherein the polyurethane is added to a cathode.
7. The battery according to claim 5, wherein the polyurethane is polyether urethane.
8. The battery according to claim 7, wherein the polyether urethane is added to a cathode, thereby improving overcharge safety and high-temperature safety.