GB513700A - Improvements in grab dredgers - Google Patents

Improvements in grab dredgers

Info

Publication number
GB513700A
GB513700A GB1142338A GB1142338A GB513700A GB 513700 A GB513700 A GB 513700A GB 1142338 A GB1142338 A GB 1142338A GB 1142338 A GB1142338 A GB 1142338A GB 513700 A GB513700 A GB 513700A
Authority
GB
United Kingdom
Prior art keywords
bucket
valve
cylinder
water
grab
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB1142338A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JOHN COSGROVE WILLIAMS
Original Assignee
JOHN COSGROVE WILLIAMS
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
Application filed by JOHN COSGROVE WILLIAMS filed Critical JOHN COSGROVE WILLIAMS
Priority to GB1142338A priority Critical patent/GB513700A/en
Publication of GB513700A publication Critical patent/GB513700A/en
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/40—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets
    • E02F3/413—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with grabbing device
    • E02F3/4131—Dippers; Buckets ; Grab devices, e.g. manufacturing processes for buckets, form, geometry or material of buckets with grabbing device mounted on a floating substructure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/02—Bucket grabs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/14—Grabs opened or closed by driving motors thereon
    • B66C3/16—Grabs opened or closed by driving motors thereon by fluid motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

513,700. Grab-buckets. WILLIAMS, J. C. April 13, 1938, No. 11423. [Class 78 (iv)] In a grab for submarine use, the bucket is closed on reaching the sea bed by means of a prime mover actuated by the pressure of the surrounding water. In the embodiment shown the prime mover consists of a piston- and-cylinder unit 30, 21. When the grab rests on the sea bed, the hoisting cable 27 becomes slack and a spring 28 depresses a plunger 26 attached to the cable, and through rods 24, 25 opens a valve 23 to allow water to enter the cylinder 21 and force the piston 30 upwards. Racks 31 carried by the piston move upwards and by engagement with gears 32 rotate cranks 34 connected by links 35 to the bucket parts 10 to close the bucket. When the cable is now brought taut, the valve 23 is closed by the rod 24 and the bucket held closed until it is withdrawn from the water and the valve opened by a hand lever 37. Water then drains from the cylinder through the port 22 and the bucket is opened by counterweights 38. In a modified arrangement, Fig. 5, the valve 23 is opened as the bucket approaches the sea bed by a plunger 41 co-operating with a valve lever 43 and provided with a shoe 45. To assist opening of the bucket a tank 39 is connected to the cylinder by a pipe 40, and to assist the closing of the bucket and to release the bucket should it encounter a projecting rock or a wreck this tank is connected to an air pump 54 and the cylinder also connected to a liquid pump 56 by a hose 55. A valve 58 in the hose may be controlled manually by means of a cable or automatically by means of a roller 64 engaging a cam 62 attached to one of the racks 31. In an alternative arrangement, Fig. 3, the grab may be released at any time by opening a valve 48 by means of a cable 50 to allow water to drain from the cylinder to a tank 46, and the closing of the bucket may be assisted by connecting a pipe 51 to a pressure pump. To effectively seal the bucket when it is closed, one of its jaws is provided with a rubber tube 13 with which the other jaw, 14, co-operates. This tube contains water maintained at a pressure greater than that of the water surrounding the grab by means of a spring-pressed plunger 17 in a cylinder 16 connected to the tube by a pipe 15 and communicating with the surrounding water through a port 20.
GB1142338A 1938-04-13 1938-04-13 Improvements in grab dredgers Expired GB513700A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1142338A GB513700A (en) 1938-04-13 1938-04-13 Improvements in grab dredgers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1142338A GB513700A (en) 1938-04-13 1938-04-13 Improvements in grab dredgers

Publications (1)

Publication Number Publication Date
GB513700A true GB513700A (en) 1939-10-19

Family

ID=9985947

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1142338A Expired GB513700A (en) 1938-04-13 1938-04-13 Improvements in grab dredgers

Country Status (1)

Country Link
GB (1) GB513700A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0853061A1 (en) * 1997-01-14 1998-07-15 Bümach Engineering International B.V. Universal drive for a gripper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0853061A1 (en) * 1997-01-14 1998-07-15 Bümach Engineering International B.V. Universal drive for a gripper

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