Patent AT322264B successfully refreshed from Google Patents.
CA1069494A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Floating cushion sub
Assignee: Bralorne Resources Ltd
•
Filing: 1977-07-21
•
Granted: 1980-01-08
•
Expires: 1997-07-21
Abstract
Abstract ABSTRACT OF THE DISCLOSURE A floating cushion sub for connection to the rotary power head of a drill rig has a mandrel section connectable to a drill string and an outer housing section connectable to the power head. The mandrel and the housing have mating, axi- ally extending splines permitting relative axial movement while also transmitting torque from the power head to the mandrel. Mandrel axial movement is limited by a cap member and by an internal shoulder in the housing. A resilient cushion adjacent the shoulder dampens vibrations when the mandrel and housing are compressed together and a similar cushion adjacent the cap member dampens vibrations when the mandrel and housing are at full extension. The axial movement of the mandrel relative to the housing improves the function of making or breaking the threaded connections with the drill string by permitting proper coordination of the mating thread pitches and reduces the chance of cross-threading.
Inventors
- 👤 Gary D. Gray
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-09 09:34
CPC Classifications
F; F16; F16D; F16D3/00; F16D3/02; F16D3/06; E; E21; E21B; E21B17/00; E21B17/02; E21B17/04; E21B17/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
215 words
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS: 1. An axially floating member for a drill string comprising: (a) a mandrel section having an axially extending through bore, a box end, an enlarged diameter central portion, and an axial extension at the end opposite said box end; (b) an outer housing section having a pin end, an axially extending bore through said pin end for receiving said mandrel extension, and an enlarged diameter annular portion at the end opposite said pin end for receiving said mandrel central portion; (c) cooperating means on said mandrel central portion and said enlarged annular portion for transmitting torque between said outer housing section and said mandrel section, and for permitting relative axial movement between said mandrel section and said outer housing section; (d) a cap member mountable on said annular portion and engageable with said mandrel central portion for limiting said relative axial movement. (e) first resilient annular cushion means tightly engaging said mandrel extension and positioned within an annular cavity formed between said mandrel extension and said annular portion; and (f) second resilient annular cushion means tightly engaging said mandrel box end and positioned within an annular cavity formed between said mandrel box end and said cap member.
Claim 2
Dependent Claim
45 words
The floating member according to claim 1 wherein said cooperating means includes a plurality of circumferentially spaced, axially extending external splines on said mandrel central portion and a plurality of circumferentially spaced, axially extending internal splines on said annular portion, engageable with said external splines.
Claim 3
Dependent Claim
59 words
The floating member according to claim 1 or claim 2 wherein said cap member is threadably engaged with said annular portion, said cap member having an end wall having a through bore for reception of said box end and having an internal step adjacent said end wall for abutting engagement with an annular end face of said annular portion.
Claim 4
Dependent Claim
42 words
The floating member according to claim 1 or claim 2 and including resilient seal means in said pin end through bore for sealing engagement with said mandrel extension, and resilient wiper means in said cap member engageable with said mandrel box end.
Claim 5
Dependent Claim
21 words
The floating member according to claim 1 or claim 2 wherein said first and second cushion means are formed of urethane.
Claim 6
Dependent Claim
270 words
An axially floating cushion sub for a drill string comprising: (a) a mandrel having an axially extending through bore, a box end for connection to a pin end of a drill string member, a radially enlarged central portion having a plurality of circumferentially spaced, axially extending external splines, and an axial extension at the end opposite said box end; (b) an outer housing having a pin end for connection to a power head of a drill rig, an axially extending through bore in said pin end for receiving said mandrel extension, and a radially enlarged annular portion having a plurality of circumferentially spaced, axially extending internal splines engageable with the external splines of said mandrel central portion; (c) a cup-shaped cap member having an end wall with a through bore for reception of said mandrel box end, and being threadably engageable with said annular portion for retaining said mandrel in engagement with said outer housing and for limiting relative axial movement between said mandrel and said outer housing; (d) a first annular urethane cushion member fitting tightly over said mandrel extension and positioned within an annular cavity formed between said mandrel extension and said annular portion; (e) a second annular urethane cushion member fitting tightly over said mandrel box end and positioned within a cavity formed between said cap member and said mandrel box end; (f) a wiper ring positioned in an annular recess of said cap member bore for sealing engagement with said mandrel box end; and (g) a rod seal positioned in an annular recess of said pin end through bore for sealing engagement with said mandrel extension.
Claim 7
Dependent Claim
29 words
The cushion sub of claim 6 wherein said cap member includes an internal step adjacent said end wall for abutting engagement with an end face of said annular portion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.