Plate vibrator

Claim 2

A plate vibrator for compacting soil, asphalt and similar materials, comprising a bottom plate, a vibrating element rigidly mounted on the bottom plate, a power unit resiliently mounted on the bottom plate for driving the vibrating element, the vibrating element comprising a rotating shaft, at least two eccentric weights mounted on the rotating shaft, and an adjusting mechanism for altering the phase positions of the weights in relation to each other, the adjusting mechanism interacting with the eccentric weights for the purpose of achieving both a vibratory compacting motion and movement of the plate in a forward or reverse direction on the surface that is to be compacted, characterized in that the vibrating element and power unit are positioned one behind the other on the bottom plate of the plate vibrator and in that the distribution of the masses oscillating with the bottom plate is so selected that the common center of gravity of these masses, including the mass of the bottom plate, is situated between and above the lines of force of the centrifugal forces generated by the vibrating element when driving forward and in reverse, respectively, and in a vertical plane containing said lines of force, so that, for movement in either direction, the amplitude of vibration of the bottom plate is greater at the front or leading part of the bottom plate than at the rear or trailing part.

Claim 3

A plate vibrator as in claim 1, wherein at least one of the eccentric weights is fixed on the shaft and at least one of the eccentric weights is mounted in such a way that it is rotatable in relation to the shaft and is arranged to rotate at the same speed as, but in the opposite direction to, the fixed eccentric weight, further comprising means for rotating said rotatable eccentric weight, said means comprising a chain transmission driven by said shaft, a gear driven by the chain transmission and journalled in the adjusting mechanism, and a gear rigidly mounted on the rotatable eccentric weight and interacting with the gear journalled in the adjusting mechanism.

Claim 4

A plate vibrator for compacting soil, asphalt and similar materials, comprising a bottom plate, a vibrating element rigidly mounted on the bottom plate, a power unit resiliently mounted on the bottom plate for driving the vibrating element, the vibrating element comprising a rotating shaft, at least two eccentric weights mounted on the rotating shaft, and an adjusting mechanism for altering the phase positions of the weights in relation to each other, the adjusting mechanism interacting with the eccentric weights for the purpose of achieving both a vibratory compacting motion and movement of the plate in a forward or reverse direction on the surface that is to be compacted, characterized in that the vibrating element and power unit are positioned one behind the other on the bottom plate of the plate vibrator, whereby the distribution of the masses oscillating with the bottom plate is so selected that the common center of gravity of these masses, including the mass of the bottom plate, is situated between and above the lines of force of the centrifugal forces generated by the vibrating element when driving forward and in reverse, respectively, and in a vertical plane containing said lines of force, wherein at least one of the eccentric weights is fixed on the shaft and at least one of the eccentric weights is mounted in such a way that it is rotatable in relation to the shaft and is arranged to rotate at the same speed as, but in the opposite direction to, the fixed eccentric weight, further comprising means for rotating said rotatable eccentric weight, said means comprising a chain transmission driven by said shaft, a gear driven by the chain transmission and journalled in the adjusting mechanism, and a gear rigidly mounted on the rotatable eccentric weight and interacting with the gear journalled in the adjusting mechanism, and wherein the chain transmission comprises a chain sprocket journalled concentrically with the adjusting mechanism and attached to the fixed eccentric weight, a chain sprocket mounted in such a way that it can rotate on a radially protruding part of the adjusting mechanism, a chain connecting the two sprockets, and a sprocket shaft mounting the second-name of said sprockets, and wherein the gear journalled in the adjusting mechanism is rigidly mounted on the sprocket shaft.

Claim 5

A plate vibrator for compacting soil, asphalt and similar materials, comprising a bottom plate, a vibrating element rigidly mounted on the bottom plate, a power unit resiliently mounted on the bottom plate for driving the vibrating element, the vibrating element comprising a rotating shaft, at least two eccentric weights mounted on the rotating shaft, and an adjusting mechanism for altering the phase positions of the weights in relation to each other, the adjusting mechanism interacting with the eccentric weights for the purpose of achieving both a vibratory compacting motion and movement of the plate in a forward or reverse direction on the surface that is to be compacted, characterized in that the vibrating element and power unit are positioned one behind the other on the bottom plate of the plate vibrator, whereby the distribution of the masses oscillating with the bottom plate is so selected that the common center of gravity of these masses, including the mass of the bottom plate, is situated between and above the lines of force of the centrifugal forces generated by the vibrating element when driving forward and in reverse, respectively, and in a vertical plane containing said lines of force, wherein at least one of the eccentric weights is fixed on the shaft and at least one of the eccentric weights is mounted in such a way that it is rotatable in relation to the shaft and is arranged to rotate at the same speed as, but in the opposite direction to, the fixed eccentric weight, further comprising means for rotating said rotatable eccentric weight, said means comprising a chain transmission driven by said shaft, a gear driven by the chain transmission and journalled in the adjusting mechanism, and a gear rigidly mounted on the rotatable eccentric weight and interacting with the gear journalled in the adjusting mechanism, and wherein the chain transmission comprises a chain sprocket journalled concentrically with the adjusting mechanism and attached to the fixed eccentric weight, a chain sprocket mounted in such a way that it can rotate on a radially protruding part of the adjusting mechanism, a chain connecting the two sprockets, and a sprocket shaft mounting the second-name of said sprockets, and wherein the gear journalled in the adjusting mechanism is rigidly mounted on the sprocket shaft.

Claim 6

A plate vibrator for compacting soil, asphalt and similar materials, comprising a bottom plate, a vibrating element rigidly mounted on the bottom plate, a power unit resiliently mounted on the bottom plate for driving the vibrating element, the vibrating element comprising a rotating shaft, at least two eccentric weights mounted on the rotating shaft, and an adjusting mechanism for altering the phase positions of the weights in relation to each other, the adjusting mechanism interacting with the eccentric weights for the purpose of achieving both a vibratory compacting motion and movement of the plate in a forward or reverse direction on the surface that is to be compacted, characterized in that the vibrating element and power unit are positioned one behind the other on the bottom plate of the plate vibrator, whereby the distribution of the masses oscillating with the bottom plate is so selected that the common center of gravity of these masses, including the mass of the bottom plate, is situated between and above the lines of force of the centrifugal forces generated by the vibrating element when driving forward and in reverse, respectively, and in a vertical plane containing said lines of force, wherein at least one of the eccentric weights is fixed on the shaft and at least one of the eccentric weights is mounted in such a way that it is rotatable in relation to the shaft and is arranged to rotate at the same speed as, but in the opposite direction to, the fixed eccentric weight, further comprising means for rotating said rotatable eccentric weight, said means comprising a chain transmission driven by said shaft, a gear driven by the chain transmission and journalled in the adjusting mechanism, and a gear rigidly mounted on the rotatable eccentric weight and interacting with the gear journalled in the adjusting mechanism, and wherein the adjusting mechanism is mounted in such a manner that it can rotate on the shaft of the vibrating element and formed with a groove arranged concentrically in relation to this shaft, further comprising elongated flexible control means placed in said groove, one end of said flexible control means being attached to the adjusting mechanism and the other end of said flexible control means extending away therefrom to permit control by an operator of the angular position of said adjusting mechanism.

Claim 7

A plate vibrator for compacting soil, asphalt and similar materials, comprising a bottom plate, a vibrating element rigidly mounted on the bottom plate, a power unit resiliently mounted on the bottom plate for driving the vibrating element, the vibrating element comprising a rotating shaft, at least two eccentric weights mounted on the rotating shaft, and an adjusting mechanism for altering the phase positions of the weights in relation to each other, the adjusting mechanism interacting with the eccentric weights for the purpose of achieving both a vibratory compacting motion and movement of the plate in a forward or reverse direction on the surface that is to be compacted, characterized in that the vibrating element and power unit are positioned one behind the other on the bottom plate of the plate vibrator, whereby the distribution of the masses oscillating with the bottom plate is so selected that the common center of gravity of these masses, including the mass of the bottom plate, is situated between and above the lines of force of the centrifugal forces generated by the vibrating element when driving forward and in reverse, respectively, and in a vertical plane containing said lines of force, wherein at least one of the eccentric weights is fixed on the shaft and at least one of the eccentric weights is mounted in such a way that it is rotatable in relation to the shaft and is arranged to rotate at the same speed as, but in the opposite direction to, the fixed eccentric weight, further comprising means for rotating said rotatable eccentric weight, said means comprising a chain transmission driven by said shaft, a gear driven by the chain transmission and journalled in the adjusting mechanism, and a gear rigidly mounted on the rotatable eccentric weight and interacting with the gear journalled in the adjusting mechanism, and wherein the adjusting mechanism is mounted in such a manner that it can rotate on the shaft of the vibrating element and formed with a groove arranged concentrically in relation to this shaft, further comprising elongated flexible control means placed in said groove, one end of said flexible control means being attached to the adjusting mechanism and the other end of said flexible control means extending away therefrom to permit control by an operator of the angular position of said adjusting mechanism.

Claim 8

A plate vibrator as in claim 4, further comprising at least one stop against which the adjusting mechanism comes to rest when driving forward and in reverse, respectively, at optimum speed.