Methods, apparatus, and system to distribute or compact coffee grounds, such as to form a puck in a portafilter. The methods, apparatus, and system may be used to compact coffee grounds wherein a resulting puck of coffee grounds in the portafilter has an even level, a uniform and or continuous density distribution, results in no or reduced formation of channels, no or reduced squirting of extracted coffee, and results in consistent and repeatable results. The methods, apparatus, and system may be used to form multiple layers in a puck, for use in preparing layered espresso.

Methods, apparatus, and system to distribute or compact coffee grounds, such as to form a puck in a portafilter. The methods, apparatus, and system may be used to compact coffee grounds wherein a resulting puck of coffee grounds in the portafilter has an even level, a uniform and or continuous density distribution, results in no or reduced formation of channels, no or reduced squirting of extracted coffee, and results in consistent and repeatable results. The methods, apparatus, and system may be used to form multiple layers in a puck, for use in preparing layered espresso.

A vibrating toothbrush and an eccentric shaft are proposed. The vibrating toothbrush includes a head in which bristles are planted, and a handle from which a head coupler protrudes, the head being detachably coupled to the head coupler. The toothbrush includes an electric motor accommodated in the handle to generate rotating force; and an eccentric shaft rotatably connected to the electric motor, at least a portion thereof being eccentric to generate vibration and thereby transmit vibration to the head coupler. The eccentric shaft includes a motor fixing part connected to the electric motor; an eccentric weight configured to be offset from a rotation center of the electric motor; and a rotating shaft formed of a metal material, and connecting the motor fixing part and the eccentric weight.

The disclosure provides for device for agitating a grill. The device includes a vibrational device, a power source, and a control circuit; wherein the control circuit controls the vibrational device and the power source provides power to the vibrational device. A pan of the grill houses one or more pieces of charcoal and the device is integrated into the pan. When turned on, the vibrational device vibrates at a high frequency. This vibration is translated into the pan and causes the pieces of charcoal to vibrate as well. The device is capable of withstanding a high temperature of the pan when the grill is cooking one or more pieces of food.

A soil compactor, comprising: at least two vibrating compacting rollers rotatable about a respective roller axis of rotation, a vibration excitation arrangement assigned to each vibrating compacting roller for generating a vibrating movement of the vibrating compacting rollers, a vibration detection arrangement assigned to each vibrating compacting roller for providing a vibration variable representing the vibrating movement of each vibrating compacting roller, a control unit for controlling at least one vibration excitation arrangement, based on the vibration variables provided with respect to the vibrating compacting rollers in such a way that the vibrating movements of the vibrating compacting rollers have a predefined phase offset to one another.

The present invention generally relates to a vibrator for generating vibrations. The invention is in this respect in particular based on an exciter cell having rotationally drivable unbalanced masses that are rotatably supported in an exciter cell housing and having an adjustment unit for adjusting the phase position of the unbalanced masses relative to one another. In accordance with the invention, the adjustment unit is configured as a planetary gearing that has at least two input trains to which the unbalanced masses of the exciter cell are coupled that are adjustable in phase relative to one another and that has an adjustment input train for changing the phase position of the output trains of the planetary gearing.

An orbital shaker device (1) for biotechnological and/or biomedical applications comprises a frame (10), a platform (15) for receiving biotechnological and/or biomedical containers (50), eccentric couplings (13, 14) for allowing an orbital movement of the platform (15) relative to the frame (10), counterweight units (17, 18) for balancing the orbital movement, and at least one motor (19) for driving the eccentric couplings (13, 14). The device comprises two eccentric couplings (13, 14) arranged near respective opposite edges (27, 28) of the platform (15), while each counterweight unit (17, 18) is arranged approximately in the plane of the combined center of gravity of the platform (15) and the containers (50). Furthermore, both eccentric couplings (13, 14) are driven by the motor (19) or motors, either directly or indirectly. In this way, an optimal vibration compensation is achieved while allowing an imaging unit (40) to be mounted underneath the platform (15).

One aspect of the technology involves a system for measuring the rotational position of a rotating shaft, including a field source configured to generate a measurable field, a sensor configured to measure the generated field, and a target that is configured to modify the generated field as measured by the sensor to have a shape with (a) at least one measurable feature for a zero reference point, and (b) a shape that varies throughout one or more angles such that a rotational position of the shaft is determined with a selected angular accuracy. There is also a device that receives a query for the rotational position of the shaft a device that responds to the query. Another aspect involves generating multi-frequency vibrations with a single linear resonant actuator (LRA). This LRA can exhibit a beat pattern in response to being driven by the sum of two different sinusoidal functions.

One aspect of the technology involves a system for measuring the rotational position of a rotating shaft, including a field source configured to generate a measurable field, a sensor configured to measure the generated field, and a target that is configured to modify the generated field as measured by the sensor to have a shape with (a) at least one measurable feature for a zero reference point, and (b) a shape that varies throughout one or more angles such that a rotational position of the shaft is determined with a selected angular accuracy. There is also a device that receives a query for the rotational position of the shaft a device that responds to the query. Another aspect involves generating multi-frequency vibrations with a single linear resonant actuator (LRA). This LRA can exhibit a beat pattern in response to being driven by the sum of two different sinusoidal functions.

The invention relates to a vibration generator for piling machines, compactors or other construction machines, having at least two unbalance trains, each comprising unbalanced masses which are rotatingly drivable by a drive apparatus, and an adjustment apparatus for adjusting the phase position of the rotating unbalanced masses relative to each other. According to the invention, the unbalanced masses of different unbalance trains are arranged coaxially without a fixed transmission ratio relative to each other, wherein the unbalanced masses of a first unbalance train are arranged between the unbalanced masses, coaxial therewith, of a second unbalance train, and the drive apparatus is designed to drive the unbalance trains with rotation speed differences which are variable relative to each other.