NZ247439A - Hydraulically driven impact hammer; fluid cushioning of hammerhead - Google Patents

Hydraulically driven impact hammer; fluid cushioning of hammerhead

Info

Publication number
NZ247439A
NZ247439A NZ247439A NZ24743990A NZ247439A NZ 247439 A NZ247439 A NZ 247439A NZ 247439 A NZ247439 A NZ 247439A NZ 24743990 A NZ24743990 A NZ 24743990A NZ 247439 A NZ247439 A NZ 247439A
Authority
NZ
New Zealand
Prior art keywords
hammerhead
hydraulically driven
impact hammer
driven impact
fluid cushioning
Prior art date
Application number
NZ247439A
Inventor
Jack B Ottestad
Original Assignee
Esco Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/457,479 external-priority patent/US5065824A/en
Application filed by Esco Corp filed Critical Esco Corp
Publication of NZ247439A publication Critical patent/NZ247439A/en

Links

NZ247439A 1989-12-28 1990-12-17 Hydraulically driven impact hammer; fluid cushioning of hammerhead NZ247439A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/457,479 US5065824A (en) 1989-12-28 1989-12-28 Hydraulically powered repetitive impact hammer
NZ23650290 1990-12-17

Publications (1)

Publication Number Publication Date
NZ247439A true NZ247439A (en) 1993-06-25

Family

ID=26650936

Family Applications (1)

Application Number Title Priority Date Filing Date
NZ247439A NZ247439A (en) 1989-12-28 1990-12-17 Hydraulically driven impact hammer; fluid cushioning of hammerhead

Country Status (1)

Country Link
NZ (1) NZ247439A (en)

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Legal Events

Date Code Title Description
ERR Error or correction

Free format text: THE AGENT HAS BEEN CORRECTED TO 600022, AJ PARK, STATE INSURANCE TOWER, LEVEL 22, 1 WILLIS STREET, WELLINGTON 6011, NZ; THE MISSING OWNER HAS BEEN ADDED (215425, ESCO CORPORATION, C/- A J PARK, PO BOX 949, WELLINGTON 6140, NZ); THE CONTACT HAS BEEN CORRECTED TO 600022, AJ PARK, STATE INSURANCE TOWER, LEVEL 22, 1 WILLIS STREET, WELLINGTON 6011, NZ

Effective date: 20130523