The invention relates to a vibrating plate for ground compaction, comprising a drive motor, an exciter unit which is driven by the drive motor and by means of which a base plate can be set in vibration, an adjustably mounted hood, which can be adjusted between an operating position at least partially covering the drive motor and a maintenance position at least partially exposing the drive motor, an exhaust air guiding device leading from the drive motor to an exhaust air opening in the hood for the cooling air of the drive motor, the exhaust air guiding device being formed in two parts and comprising an exhaust air adapter on the drive motor side and an exhaust air guide on the hood side, the exhaust air adapter and the exhaust air guide together forming a continuous exhaust air path from the drive motor to the exhaust air opening in the hood when the hood is in the operating position, the exhaust air adapter being attached to the drive motor, and the exhaust air guide being attached to the hood such that it is adjustable with the hood between the operating position and the maintenance position.

The invention relates to a vibrating plate for ground compaction, comprising a drive motor, an exciter unit which is driven by the drive motor and by means of which a base plate can be set in vibration, an adjustably mounted hood, which can be adjusted between an operating position at least partially covering the drive motor and a maintenance position at least partially exposing the drive motor, an exhaust air guiding device leading from the drive motor to an exhaust air opening in the hood for the cooling air of the drive motor, the exhaust air guiding device being formed in two parts and comprising an exhaust air adapter on the drive motor side and an exhaust air guide on the hood side, the exhaust air adapter and the exhaust air guide together forming a continuous exhaust air path from the drive motor to the exhaust air opening in the hood when the hood is in the operating position, the exhaust air adapter being attached to the drive motor, and the exhaust air guide being attached to the hood such that it is adjustable with the hood between the operating position and the maintenance position.

The disclosed invention includes embodiments of a multi-purpose device for working concrete surfaces, the devices designed to use linear vibratory motion provided by a source of linear oscillations, and adaptable for a number of concrete working tasks. Devices include a support pole designed to connect a concrete implement to a commercially available reciprocating saw, a mass for magnifying the effects of the saw oscillations, and other features to enable safe, comfortable use. The invention further includes embodiments of a system for working concrete surfaces, the system comprising a concrete implement, a reciprocating saw, and a support frame for conveying oscillations from the reciprocating saw to the implement and for carrying the other system components.

The disclosed invention includes embodiments of a multi-purpose device for working concrete surfaces, the devices designed to use linear vibratory motion provided by a source of linear oscillations, and adaptable for a number of concrete working tasks. Devices include a support pole designed to connect a concrete implement to a commercially available reciprocating saw, a mass for magnifying the effects of the saw oscillations, and other features to enable safe, comfortable use. The invention further includes embodiments of a system for working concrete surfaces, the system comprising a concrete implement, a reciprocating saw, and a support frame for conveying oscillations from the reciprocating saw to the implement and for carrying the other system components.

A vibrating ripper, according to the present invention, has: a main body portion; a vibrating body which is coupled to the main body portion and a vibrating body support unit and vibrates; and a vibration generating unit which is provided on the vibrating body, wherein the vibrating body support unit has a rotating member rotatably provided on the vibrating body or the main body portion for supporting the vibrating body, has first and second connecting members of which both end portions are rotatably connected to the upper and lower sides of the rotating member, with respect to the rotating center of same, and to the main body portion or the vibrating body, respectively such that the vibrating body can be supported in accordance with the main body portion, has a ripper blade provided on the vibrating body, thereby, when the vibrating body vibrates in accordance with the main body portion, offsetting, by means of the rotating of the rotating member, the change in coupling positions of the first and second connecting members and the vibrating body due to the vibration.

A vibrating ripper, according to the present invention, has: a main body portion; a vibrating body which is coupled to the main body portion and a vibrating body support unit and vibrates; and a vibration generating unit which is provided on the vibrating body, wherein the vibrating body support unit has a rotating member rotatably provided on the vibrating body or the main body portion for supporting the vibrating body, has first and second connecting members of which both end portions are rotatably connected to the upper and lower sides of the rotating member, with respect to the rotating center of same, and to the main body portion or the vibrating body, respectively such that the vibrating body can be supported in accordance with the main body portion, has a ripper blade provided on the vibrating body, thereby, when the vibrating body vibrates in accordance with the main body portion, offsetting, by means of the rotating of the rotating member, the change in coupling positions of the first and second connecting members and the vibrating body due to the vibration.

A remote controlled vibration imparting device for a concrete finishing tool uses a housing having a chamber surrounded by an inner surface of the housing. A vibrator with a support, a rotor with a shaft and weighted body, a motor, and a resilient link between the shaft and the motor is positioned within the housing chamber. The vibrator also includes a resilient band to separate the vibrator from the housing inner surface. First and second adaptors are employed for the housing to be placed between the handle and the terminus of a concrete finishing tool.

A remote controlled vibration imparting device for a concrete finishing tool uses a housing having a chamber surrounded by an inner surface of the housing. A vibrator with a support, a rotor with a shaft and weighted body, a motor, and a resilient link between the shaft and the motor is positioned within the housing chamber. The vibrator also includes a resilient band to separate the vibrator from the housing inner surface. First and second adaptors are employed for the housing to be placed between the handle and the terminus of a concrete finishing tool.

Systems and methods to provide pressed aggregate-filled cavities for improving ground stiffness and uniformity are disclosed. According to an aspect, a method includes using a mechanism to press into a ground surface in a substantially downward direction to create a concavity. The method also includes substantially or completely filling the concavity with unstabilized or chemically stabilized aggregate, soil, or sand. Further, the method includes using the mechanism to press the aggregate within the concavity to achieve a desired ground stiffness.

An electric motor is mounted on a body. The electric motor is driven by an electric driving unit. The electric driving unit is supported to the body by a vibration-proofing member. A natural frequency of a spring-mass system including the vibration-proofing member and the electric driving unit is higher than a frequency of a main component in vibration generated in the body during an operation.