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    • 2. 发明专利
    • External pawl ratchet mechanism
    • GB2607686A
    • 2022-12-14
    • GB202204883
    • 2022-04-04
    • SNAP ON INCORPORATED
    • JOSHUA M BEER
    • B25B15/04B25B13/46B25B21/00
    • A ratchet mechanism for a tool comprises a link member 118 with an opening 132 and a toothed ratchet gear 124 which can be selectively driven in either of a first or second drive direction. It further comprises first 120 and second 122 pawls pivotably coupled to the link member, which selectively engage with the toothed portion for selecting one of the first and second drive directions, and a crank shaft 126 with first and second opposing ends. The first end includes an offset pin 134 received in the opening of the link member and the second end is suitable for coupling to a motor. A selector level coupled with a cam can be used to move between first and second positions corresponding to first and second drive directions. A biasing member can be used to apply a biasing force to the pawls to bias them towards the ratchet gear. The first drive direction can be selected when the first pawl is engaged with the toothed portion of the ratchet gear and the second pawl is disengaged. Conversely the second drive direction can be selected when the second pawl is engaged, and the first pawl is disengaged.
    • 3. 发明专利
    • Current pulse limiting protection
    • GB2607663A
    • 2022-12-14
    • GB202203890
    • 2022-03-21
    • SNAP ON INCORPORATED
    • MICHAEL T RAJZERJASON GENZ
    • B25B21/00B25F5/00H02P6/24H02P29/02
    • A method 200 of operating a controller (116, Figure 2) and a motor 114, operably coupled to a power source 120 which is adapted to supply power to the motor, includes measuring current 204 flowing from the power source through the controller to the motor. A number of current pulses are counted 208 in the current flowing from the power source through the controller to the motor. The power source is caused to stop supplying power to the motor 212 when the number of current pulses meets or exceeds a pulse threshold 210. A tool including a power source adapted to supply power to a motor includes a controller adapted to measure current flowing from the power source through the controller to the motor; count a number of current pulses; and cause the power source to stop supplying power to the motor when the number of current pulses meets or exceeds a pulse threshold. The controller may implement current pulse limit protection to protect the controller and power source, such as a battery, from damage due to overcurrent pulse events. An indicator may be activated when the pulse threshold is met or exceeded.
    • 5. 发明专利
    • Short circuit protection for a BLDC motor
    • GB2607404A
    • 2022-12-07
    • GB202203887
    • 2022-03-21
    • SNAP ON INCORPORATED
    • MICHAEL T RAJZERJASON GENZ
    • B25B21/00B25F5/00H02P6/08
    • A tool (100, Figure 1) includes switching elements (124, Figure 3) and a power source (120, Figure 2) to supply a motor 114. A controller 116 is adapted to individually activate and deactivate the switching elements and measure a first current corresponding to at least one of the switching elements when activated. A short circuit fault is indicated when the measured first current meets or exceeds a first threshold current. The controller may perform a bootstrap capacitor charging process by activating low-side switching elements. A method 200 for operating a brushless DC motor having switching elements and powered by a power supply includes individually activating and deactivating the switching elements 204. A first current is then measured 206 corresponding to at least one of the switching elements when activated. A short circuit fault is indicated 214 when the measured first current meets or exceeds a first threshold current 208. A controller for a brushless DC motor with switching elements has a processing unit to perform a first short circuit check including activating first and second switching elements; measuring first and second currents; deactivating the switching elements; indicating a fault when the measured currents meet or exceed a first threshold current.