초록 ▼

An electrohydraulic pavement breaker system having cavities (28, 30) which are filled with hydraulic fluid (oil) or gas, and which provide mass spring system which is resonant at a frequency which is especially adapted for breaking and rubblizing concrete pavement. The resonant mass (18) is in impac

An electrohydraulic pavement breaker system having cavities (28, 30) which are filled with hydraulic fluid (oil) or gas, and which provide mass spring system which is resonant at a frequency which is especially adapted for breaking and rubblizing concrete pavement. The resonant mass (18) is in impacting relationship with the pavement through a shoe (12), which shoe (12) may be part of an assembly which is pivotally mounted on the support structure (10) of the breaker and is vibrated with the mass (18) to repeatedly impact the pavement at the rate of the resonant frequency. An electrohydraulic control system is responsive to the motion and average position of the mass of the vibrator and controls the driving force so as to be at the resonant frequency of the mass spring system and have the amplitude and energy suitable for breaking the pavement.

대표청구항 ▼

1. A pavement breaker comprising a resonant mass and pressurized hydraulic or pneumatic spring system, and a structure which supports said resonant mass-spring system for vibration toward and away from a pavement to be broken; an electrohydraulic driving and control system for driving said mass into

1. A pavement breaker comprising a resonant mass and pressurized hydraulic or pneumatic spring system, and a structure which supports said resonant mass-spring system for vibration toward and away from a pavement to be broken; an electrohydraulic driving and control system for driving said mass into vibration at the resonant frequency of said mass-spring system, said spring system comprising pressurized gas or liquid filled cavities, said cavities facing portions of said mass, said resonant frequency being determined by the stiffness of the fluid in said cavities and the mass of said system, an impact link or rocker in continuous contacting relationship with said mass and on to which said mass transfers vibratory force, a shoe on said link or rocker in contacting relationship with said pavement and dragable over said pavement, said link or rocker being mounted on said structure freely pivotal on an axis generally horizontal to the pavement to permit said link to move in a generally vertical direction with respect to said pavement.