A concrete vibrator includes a housing, a handle, an electric motor, a flexible shaft, a vibrator head, and a battery pack. The handle extends from the housing. The electric motor is coupled to the housing. The flexible shaft has a first end coupled to the motor and an opposite, second end. The vibrator head is coupled to the second end of the shaft. The vibrator head is configured to receive torque from the motor and the shaft to cause the vibrator head to vibrate. The battery pack is coupled to a battery receptacle defined on the housing. The battery pack is configured to provide electric power to the electric motor to drive the motor and the shaft. The concrete vibrator is operable in a briefcase configuration in which the handle is used to carry the concrete vibrator with the housing supported in a horizontal orientation.

A vibration assembly for supporting a base pallet of a concrete pipe manufacturing machine, and a method for adjusting the assembly. The assembly includes an assembly frame, at least two pallet driving blocks supported for position adjustment relative to one another on the frame, and a vibrator connected to at least one of the pallet driving blocks. The pallet driving blocks transmit force to the base pallet of the concrete pipe manufacturing machine.

An electric work machine allows use of batteries with different sizes with battery covers and allows easy maintenance of a damaged battery cover. A rechargeable concrete vibrator includes a motor, a motor housing accommodating the motor, a battery holder connected to the motor housing to receive a battery in a detachable manner, and a battery cover to cover an overall part of the battery held by the battery holder. The battery cover is attachable to and detachable from the battery holder.

A concrete vibrator includes a frame, a strap coupled to the frame, a main housing supported upon the frame, and an electric motor coupled to the main housing. The concrete vibrator further comprises a flexible shaft having a first end coupled to the motor and an opposite, second end. The concrete vibrator further comprises a vibrator head coupled to the second end of the shaft, the vibrator head configured to receive torque from the motor and the shaft to cause the vibrator head to vibrate. The concrete vibrator is operable in a backpack configuration in which the strap is used to carry the concrete vibrator with the frame in a vertical orientation, and in a briefcase configuration in which the frame is supportable in a horizontal orientation.

A concrete vibrator can automatically change the rotational speed of a motor depending on the state of a vibrating tube. Under control by a controller, the concrete vibrator is operated in a normal mode in which the motor is supplied with driving power having a frequency to make the motor rotate at a rotational speed suitable for air bubble removal, or in an idling mode in which the motor is supplied with driving power having a frequency to make the motor rotate at a lower rotational speed than in the normal mode. The controller measures, per unit of time, a value of a current that is input to the controller or motor, compares a latest current value to a reference value calculated based on a past measurement value, and compares an absolute value of the comparison value to a threshold to grasp the state of the vibrating tube.

Provided is a concrete vibrator capable of automatically changing the rotational speed of a motor depending on the state of a vibrating tube and suitably avoiding overheating of the motor and a failure due to the motor overheating.

Under control of control means 8, the concrete vibrator is operated in a normal mode in which a motor 2 is supplied with driving power having a frequency that can make the motor 2 rotate at a rotational speed suitable for an air bubble removing process, or in an idling mode in which the motor 2 is supplied with driving power having a frequency that can make the motor 2 rotate at a rotational speed lower than the rotational speed in the normal mode. The control means 8 measures, per unit of time, a value of a current that is input to the control means 8 or the motor 2 to record the value in a memory, compares a latest current value to a reference value calculated on the basis of a past measurement value, and further compares an absolute value of the comparison value to a threshold to grasp the state of the vibrating tube so that an operation mode is suitably switched.

A vibration assembly for supporting a base pallet of a concrete pipe manufacturing machine, and a method for adjusting the assembly. The assembly includes an assembly frame, at least two pallet driving blocks supported for position adjustment relative to one another on the frame, and a vibrator connected to at least one of the pallet driving blocks. The pallet driving blocks transmit force to the base pallet of the concrete pipe manufacturing machine.

A backpack device having a harness unit and a battery pack receptacle for receiving a battery pack for supplying a hand-held concrete vibrator with energy, wherein the concrete vibrator has an elastically deformable protective hose, and wherein the backpack device has a hose guide via which the protective hose can be guided with a load-transferring effect over a shoulder of a user of the backpack device.

A concrete vibrator includes a housing, a handle, an electric motor, a flexible shaft, a vibrator head, and a battery pack. The handle extends from the housing. The electric motor is coupled to the housing. The flexible shaft has a first end coupled to the motor and an opposite, second end. The vibrator head is coupled to the second end of the shaft. The vibrator head is configured to receive torque from the motor and the shaft to cause the vibrator head to vibrate. The battery pack is coupled to a battery receptacle defined on the housing. The battery pack is configured to provide electric power to the electric motor to drive the motor and the shaft. The concrete vibrator is operable in a briefcase configuration in which the handle is used to carry the concrete vibrator with the housing supported in a horizontal orientation.

A concrete vibrator includes a frame, a strap coupled to the frame, a main housing supported upon the frame, and an electric motor coupled to the main housing. The concrete vibrator further comprises a flexible shaft having a first end coupled to the motor and an opposite, second end. The concrete vibrator further comprises a vibrator head coupled to the second end of the shaft, the vibrator head configured to receive torque from the motor and the shaft to cause the vibrator head to vibrate. The concrete vibrator is operable in a backpack configuration in which the strap is used to carry the concrete vibrator with the frame in a vertical orientation, and in a briefcase configuration in which the frame is supportable in a horizontal orientation.