Precision torque screwdriver
First Claim
1. A transducer assembly for use in a power tool including a housing, a motor, an output shaft that receives torque from the motor, and a planetary transmission positioned between the motor and the output shaft, the planetary transmission including a ring gear, the assembly comprising:
- a bracket affixed to the housing;
a protrusion including an arcuate outer periphery, the protrusion being offset from a central axis of the bracket and extending from the bracket in a direction parallel with the central axis; and
a transducer includingan inner hub having a first face, a second face opposing the first face, an aperture defining a first open end coinciding with the first face and a second open end coinciding with the second face, wherein a distal end of the protrusion is received in the aperture, the arcuate outer periphery of the protrusion being in substantially line contact with a wall segment at least partially defining the aperture between the first and second open ends,an outer rim affixed to the ring gear,a flexible web interconnecting the inner hub to the rim, anda sensor affixed to the flexible web for detecting strain of the flexible web in response to a reaction torque applied to the ring gear from the output shaft.
1 Assignment
0 Petitions
Accused Products
Abstract
A transducer assembly for use in a power tool includes a bracket affixed to a housing of the power tool and a protrusion having an arcuate outer periphery. The protrusion is offset from a central axis of the bracket and extends from the bracket in a direction parallel with the central axis. The transducer assembly also includes a transducer having an inner hub with an aperture through which a distal end of the protrusion is received. The arcuate outer periphery of the protrusion is in substantially line contact with a wall segment at least partially defining the aperture. The transducer also includes an outer rim affixed to a ring gear of the power tool, a flexible web interconnecting the inner hub to the rim, and a sensor affixed to the flexible web for detecting strain of the flexible web in response to a reaction torque applied to the ring gear.
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Citations
20 Claims
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1. A transducer assembly for use in a power tool including a housing, a motor, an output shaft that receives torque from the motor, and a planetary transmission positioned between the motor and the output shaft, the planetary transmission including a ring gear, the assembly comprising:
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a bracket affixed to the housing; a protrusion including an arcuate outer periphery, the protrusion being offset from a central axis of the bracket and extending from the bracket in a direction parallel with the central axis; and a transducer including an inner hub having a first face, a second face opposing the first face, an aperture defining a first open end coinciding with the first face and a second open end coinciding with the second face, wherein a distal end of the protrusion is received in the aperture, the arcuate outer periphery of the protrusion being in substantially line contact with a wall segment at least partially defining the aperture between the first and second open ends, an outer rim affixed to the ring gear, a flexible web interconnecting the inner hub to the rim, and a sensor affixed to the flexible web for detecting strain of the flexible web in response to a reaction torque applied to the ring gear from the output shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A rotary power tool comprising:
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a housing; a motor; an output shaft that receives torque from the motor; a planetary transmission positioned between the motor and the output shaft, the planetary transmission including a ring gear; a bracket affixed to the housing; a protrusion including an arcuate outer periphery, the protrusion being offset from a central axis of the bracket and extending from the bracket in a direction parallel with the central axis; and a transducer including an inner hub having a first face, a second face opposing the first face, an aperture defining a first open end coinciding with the first face and a second open end coinciding with the second face, wherein a distal end of the protrusion is received in the aperture, the arcuate outer periphery of the protrusion being in substantially line contact with a wall segment at least partially defining the aperture between the first and second open ends, an outer rim affixed to the ring gear, a flexible web interconnecting the inner hub to the rim, and a sensor affixed to the flexible web for detecting strain of the flexible web in response to a reaction torque applied to the ring gear from the output shaft. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification