Tool driving or impacting – Impacting devices – Hammer head driven by spring
Patent
1995-10-06
1997-09-02
Smith, Scott A.
Tool driving or impacting
Impacting devices
Hammer head driven by spring
173118, 173210, B25D 1724
Patent
active
056621779
ABSTRACT:
A device for breaking concrete and similar frangible materials to reduce it to rubble includes a power plunger and an actuator plunger mounted within a casing. The casing is carried on and operated by construction equipment such as a back hoe. As the back hoe is operated to cock the power plunger by moving the actuator plunger toward the concrete surface, a trigger mechanism affixed to the actuator plunger lifts the power plunger and an associated latch member to load a coil spring associated with the power plunger and presses against the latch member. As the coil is fully compressed, the trigger mechanism engages a trigger operating abutment and releases the latch member. The coil spring then fires the power plunger against the concrete. An improved trigger mechanism and latch member are provided with essentially spherical latching edge portions which compensate for misalignment of the power and actuator plungers due to wear of their bearings and the torsional effect of loading the coil spring, increasing the life of the parts and reducing the frequency of necessary repairs. The arrangement and shape of the latching edges are such that further coil spring compression is avoided when the latch member is released. In its preferred and simplist form, the trigger and latch members are produced from cast solid steel blocks welded to their respective plungers.
REFERENCES:
patent: 3358778 (1967-12-01), Ferwerda
patent: 3358779 (1967-12-01), Cunningham
patent: 4076081 (1978-02-01), Schnell
patent: 4785893 (1988-11-01), Kistner
patent: 4867253 (1989-09-01), Eftefield et al.
Smith Scott A.
Stelacone Jay A.
Weigl William
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