Multi-mode hammer drill with shift lock
First Claim
1. A multi-mode hammer drill comprising:
- a support member having a lock surface;
a shift member mounted on a support member for movement in a first direction along the support member between a first mode position corresponding to a first mode of operation and a second mode position corresponding to a second mode of operation, the shift member having a cooperating lock surface;
a biasing member configured to exert a biasing force on the shift member in a second direction that is different from the first direction and toward a lock position where the lock surface can engage against the cooperating lock surface, when the shift member is in the first position;
an actuation member coupled to the shift member in a configuration that generates a force sufficient to overcome the biasing force and move the shift member to an unlock position where the lock surface cannot engage against the cooperating lock surface, wherein the actuation member generates the force as part of a shifting operation from the first mode of operation to the second mode of operation.
1 Assignment
0 Petitions
Accused Products
Abstract
A shift bracket can be mounted on a shift rod for movement between a first, high-speed drilling mode and a second, low-speed drilling mode. Cooperating shift lock surfaces can be associated with the shift bracket and the shift rod, respectively. For example, a groove in the can create a shift lock surface on the shift rod. The shift bracket can be moved into a locked configuration where the cooperating shift lock surfaces can engage each other preventing movement of the bracket out of the high-speed drilling mode. The hammer mode can correspond to the high-speed drilling mode, but not to the low-speed drilling mode. A spring member can bias the bracket toward the locked position. An actuation member can be coupled to the shift bracket to overcome the biasing member and to rotate or perpendicularly move the bracket into an unlocked position. The actuation member can also move the shift member from the first mode to the second mode.
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Citations
33 Claims
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1. A multi-mode hammer drill comprising:
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a support member having a lock surface; a shift member mounted on a support member for movement in a first direction along the support member between a first mode position corresponding to a first mode of operation and a second mode position corresponding to a second mode of operation, the shift member having a cooperating lock surface; a biasing member configured to exert a biasing force on the shift member in a second direction that is different from the first direction and toward a lock position where the lock surface can engage against the cooperating lock surface, when the shift member is in the first position; an actuation member coupled to the shift member in a configuration that generates a force sufficient to overcome the biasing force and move the shift member to an unlock position where the lock surface cannot engage against the cooperating lock surface, wherein the actuation member generates the force as part of a shifting operation from the first mode of operation to the second mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A multi-mode hammer drill comprising:
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a support member having a lock surface and a shift surface; a shift member having a cooperating lock surface, the shift member being mounted on the support member in a configuration permitting movement of the shift member along the shift surface between a first mode position corresponding to a first mode of operation and a second mode position corresponding to a second mode of operation, and when the shift member is in the first mode position, the configuration permitting limited movement of the shift member between a lock position and an unlock position in a direction that is substantially perpendicular to the shift surface; a biasing member configured to exert a biasing force on the shift member toward the lock position where the lock surface can engage against the cooperating lock surface, when the shift member is in the first position; an actuation member coupled to the shift member in a configuration that, during shifting between the first mode of operation and the second mode of operation, exerts a force on the shift member that is sufficient to overcome the biasing force and cause movement of the shift member in a direction that is substantially perpendicular to the shift surface to an unlock position where the lock surface cannot engage against the cooperating lock surface, and thereafter, the actuation member moving the shift member from the first mode position to the second mode position. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A multi-mode hammer drill comprising:
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a support member having a lock surface, and a shift surface substantially perpendicular to the lock surface; a shift member having a cooperating lock surface, the shift member being mounted on the support member in a configuration permitting movement of the shift member along the shift surface between a first mode position corresponding to a first mode of operation and a second mode position corresponding to a second mode of operation, and when the shift member is in the first mode position, the configuration permitting limited rotational movement between a lock position and an unlock position; a biasing member configured to exert a biasing force on the shift member to cause rotation of the shift member toward the lock position where the lock surface can engage against the cooperating lock surface, when the shift member is in the first mode position; an actuation member coupled to the shift member in a configuration that, during shifting between the first mode of operation and the second mode of operation, exerts a force on the shift member in a direction that is substantially parallel to a direction of movement of the shift member and offset from the shift surface, the force exerting a moment on the shift member, thereby overcoming the biasing force and causing counter-rotation of the shift member into the unlock position where the lock surface cannot engage against the cooperating lock surface, and thereafter, the actuation member moving the shift member from the first mode position to the second mode position. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification