Resources Contact Us Home
Retraction system for a latching mechanism of a tool

Image Number 10 for United States Patent #6059053.

A retraction system allows disengagement of retrieval latch dogs of a down hole running tool from a bit locking sleeve. The locking sleeve is slidably retained within a drive sub and includes a pair of slots which are engaged by the retrieval latch dogs when the tool is used to retrieve bit segments from the drive sub. The retraction system includes a sleeve which is slidably mounted on a main body of the tool and spring which is biased to push the sleeve over the retrieval latch dogs. The sleeve has a pair of diametrically opposed slots through which the retrieval latch dogs can extend for contacting the inner surface of the drive sub. The retraction system also includes a length of the inner surface of the drive sub which is made of progressively reducing diameter in the direction of retraction of the tool from the drive sub. The upper end of each slot is provided with a bevel for directing the retrieval latch dogs in the inward direction. To withdraw the tool from the drive sub, the retrieval latch dogs are disengaged from the bit locking sleeve by the combined action of the shape of surface portion which acts to push the retrieval latch dogs inwardly, together with the force of spring and the beveled surfaces which act to push the sleeve over the retrieval latch dogs thereby disengaging it from the bit locking sleeve.

  Recently Added Patents
Memory circuit and method of forming the same using reduced mask steps
System and method for netbackup data decryption in a high latency low bandwidth environment
Distylium plant named `PIIDIST-I`
Organic elelectroluminescent display
Method for assisting in the checking of transaction records, transaction device, server, mobile terminal, and corresponding computer programs
Linear transformer power supply
Hard disk drives having different rotational speeds
  Randomly Featured Patents
Catalyst of polymerization, copolymerization and oligomerization of olefins and drolefins
Compositions for forming a semiconducting and/or silicon-containing film, and structures formed therefrom
Mobile phone
Pharmaceutical compositions for parenteral or local administration
Hypochlorite bleach containing surfactant and organic antifoamant
Toner cartridge holder
Method and kit having layered device for detecting biological component by interference color
Voltage level shifting circuit and method
Aluminum electrolytic capacitor assembly
Lengthened tubular pin member nose for improving sealing integrity and bearing forces