A mechanism to prevent an adjustment knob associated with a piece of equipment (e.g. musical instrument or amplifier) from being moved accidentally includes an inner hub held in place on an adjustable shaft. An knob body fits concentrically over the inner hub, and is biased into position over the hub. The bottom of the knob body has locking structure which lockingly but releasingly cooperates with locking structure associated with the piece of equipment to which the shaft is affixed. A biasing structure such as a spring retains the knob body in a first, locked, position, in which the knob body is prevented from rotating, which in turn prevents rotation of the adjustable shaft. However, when the knob body is pulled away from the locking structure against the spring force, the knob body can be rotated, which in turn rotates the hub and shaft shaft. Releasing the knob body allows the biasing structure to urge the knob body back into engagement with the locking structure.

Lockable knobs for a rotary control of a device are described, wherein the control may be set at a specific setting via the knob without being susceptible to accidental disruption of the setting during use or transport of the device. Generally the device features: a spindle that is coupled to the rotary control via a set screw; a locking base with teeth that is stationary coupled adjacent to the spindle; and, a locking nut that may be positioned over the spindle, wherein the nut is configured to electively interact with the teeth of the base to prevent or allow rotation of the spindle.

A work machine includes an unload lever swingably supported by an operation box, the unload lever being configured to be swung to select whether or not to supply an operation fluid to the hydraulic actuator. The unload lever includes a second guide pin to move in a first guide groove in accordance with the swinging of the unload lever, the second guide pin being positioned on a first end of the first guide groove when the unload lever is positioned to a pushed-down position and positioned on a second end of the first guide groove when the unload lever is positioned to a pulled-up position. The first guide groove includes a first latch portion to latch the second guide pin at the first end of the first guide groove, and a second latch portion to latch the second guide pin at the second end of the first guide groove.

A knob assembly for a gas valve of a cooking appliance and a method of assembling said knob assembly is provided. The knob assembly can include a knob configured to engage a valve stem of the gas valve and a lock assembly including a locking element and a locking plate. The locking element can include at least one cam element that can be engaged by at least one projection carried by the locking plate. The locking plate can be configured to rotate relative to the locking element between a first position in which the at least one projection engages the at least one cam element and a second position in which the at least one projection is disengaged from the at least one cam element, and wherein in the first position the at least one cam element inhibits actuation of the gas valve by the knob.

A control knob for controlling the operation of a component of a household appliance is disclosed. The control knob includes a body configured to be attached to a rotatable rod extending from the appliance. A locking element reversibly secures the body in at least one rotational position. The locking element is movable between a first position and a second position. The locking element is configured to engage with a notch to rotatably secure the body in the at least one rotational position when the locking element is in the first position, and to disengage from the notch to permit the body to be rotated when the locking element is in the second position.

Systems and device configurations are provided for reducing misstep, such as miscommunication between a vehicle and a driver that results in applying the incorrect pedal. Vehicle pedal configurations having a positioning element are described. Embodiments include pedal configurations having a pedal pad and at least one positioning element to adjust the pedal pad in response to pedal misstep. Pedal adjustment can include rotation of a pedal pad, rotation of portions of a pedal pad, and multibody pedal pad configurations. According to embodiment, a pedal pad includes vibrational elements to control vibration of the pedal. Embodiments are also directed to a pedal configuration including a flip plate. Systems are provided including a controller to control a pedal configuration and positioning elements. The controller may control the pedal based on a driving mode, such as an assistive driving state wherein operator is instructed to apply a pedal.

In some embodiments, a protective apparatus for rotary control knobs may comprise a cover adapted fit over a rotary control knob; a knob cavity internal to the cover adapted to provide space for the rotary control knob to rotate about; and an access aperture located on the surface of cover member and adapted to provide limited user access to the rotary control knob. The cover member may be configured to encase or surround a control knob. The apparatus may further comprise a plate which may be integrally formed or molded to the cover and which contains a control shaft aperture adapted to receive the control shaft of a rotary control assembly. Once a control shaft is inserted through the control shaft aperture, a fastener may be secured to the control shaft over the plate, thereby securing the apparatus to the control shaft.

A locking mechanism for a control device which utilizes rotation motion of a shaft as a means of actuation, such as a potentiometer. The locking mechanism includes a tubular body, an actuation shaft, a plurality of splines, a plurality of spline-receiving cavities, and a push-lock mechanism. The actuation shaft transfers rotation motion from a user to the control device and is slidably and rotatably positioned within the tubular body. The splines are radially distributed about the actuation shaft to interlock with the plurality of spline-receiving cavities. The spline-receiving cavities are radially positioned around the tubular body with each cavity traversing into the tubular body from an inner surface. The push-lock mechanism locks the actuation shaft relative to the tubular body and is mounted offset to a second end of the tubular body. An output coupling end of the actuation shaft is bistably coupled to the push-lock mechanism.

A control element for a vehicle is designed to change between a parking state and a driving state. In the parked state, the control element is designed to enable a driver to switch the vehicle from a parked state to a travel state. The control element also enables the vehicle driver to freely select a gear of the vehicle by changing from a parking state into a drive state.

Provided is an operating device comprising: an operation part which is inserted into an insertion hole portion of a glass part and has a locking protrusion portion having a protruding shape on the side surface thereof; and a locking rotation part which is disposed in a position opposite to the side surface of the operation part so as to allow or lock the movement of the locking protrusion portion, the locking rotation part comprising: a frame part having an inner hole portion into which the operation part is inserted; and a hollow hole part rotatably disposed in the frame part and communicating with the inner hole portion.