Tool driving or impacting – Hammer or tool shaft reciprocated by gripping means which... – With fixed means cyclically contacted by grip structure
Patent
1986-07-02
1988-10-11
Kazenske, E. R.
Tool driving or impacting
Hammer or tool shaft reciprocated by gripping means which...
With fixed means cyclically contacted by grip structure
E21B 100
Patent
active
047764074
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to construction engineering, and more particularly to clamping attachments to devices for driving rod elements of low rigidity into the ground.
PRIOR ART
The practice widespread in most industrially developed countries is to drive into the ground rods provided with corrosion-resistant coatings. The volume of work associated with driving such rods into the ground is considerable with a trend for an increase.
Since a major condition for prolonged service life of rods envisages the lack of damage to corrosion-resistant coatings, the problem to be solved rests with designing such means for transmitting power from an impact power source to the rod being driven that would not damage the protective coating.
There is known a clamping attachment to a device for driving into the ground earthing electrode rods (cf., USSR Inventor's Certificate No. 376,525, IPC E 02 D 7/18) which comprises a housing having a through tapered interior made integral with a movable spring-loaded anvil. The interior of the clamping attachment accommodates wedging elements and a spring ensuring a contact of these elements with the housing of the clamping attachment and with the rod. The surfaces of the wedging elements engageable with the rod have sharp edges for power locking of the rod in the clamping attachment. The means for driving the rod into the ground is generally a percussive action device. Arranged coaxially with the main clamping attachment is an additional rodgripping means. The rod is passed through the additional rod-gripping means, hammer of the percussive action unit, and main clamping attachment until it bears on the ground. In the course of its travel along the rod the hammer of the percussive action unit delivers impacts on the movable anvil, whereby the rod is jammed in the clamping attachment to travel therewith downwards. Concurrently, the spring is compressed, and when the hammer ascends to deliver a successive impact, the spring acts to raise the anvil with the clamping attachment to the initial position.
Inherent in the aforedescribed clamping attachment construction is insufficient strength of the movable anvil made integral with the housing of the arrangement and adapted to take up off-center impact loads. Also, as the rod penetrates deeper into the ground, it becomes necessary to slide the clamping attachment upwards and fix it at a higher level, which results in lateral notches on the rod caused by the sharp edges to provoke damage of the protective coating of the rod surface and make it more susceptible to corrosion.
There is also known a clamping attachment to a device for driving into the ground rod elements of low rigidity (cf., e.g., U.S. Pat. No. 4,205,727, IPC E 21 B 1/02) which comprises a housing having a through tapered interior and shoulders on its outer surface, spring-loaded wedging elements with grooves or slots on their outer surface accommodated in the tapered interior of the housing, and arms secured in pins on the shoulders of the housing and having their ends received by the slots of the wedging elements. Provided at the other surface of the wedging elements in contact with the rod are sharp edges for power locking the rod in the clamping attachment. This prior art clamping attachment can be rigidly coupled with a percussive air-operated mechanism having a through axial passage, as illustrated in another U.S. Pat. No. 4,160,486, IPC E 21 B 1/02.
The rod to be driven into the ground is inserted from above into the axial passage of the percussive action air-operated mechanism to be passed therethrough until in contact with the ground surface. While holding the rod in the required position, the clamping attachment and the percussive action mechanism are raised to a height of 0.5 to 0.7 m above the ground level. The wedging elements are forced by the spring to assume the topmost position until they engage the rod by their sharp edges. Under the action of impacts delivered by the percussive action air-operated mechanism and imparted to the clamping attach
REFERENCES:
patent: 4205727 (1980-06-01), Smolyanitsky
Boginsky Vladimir P.
Danilov Boris B.
Kostylev Alexandr D.
Smolyanitsky Boris N.
Syryamin Jury N.
Fridie Jr. Willmon
Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
Kazenske E. R.
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