US3257984A - Mine anchor line cutters - Google Patents

Mine anchor line cutters Download PDF

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Publication number
US3257984A
US3257984A US356531A US35653153A US3257984A US 3257984 A US3257984 A US 3257984A US 356531 A US356531 A US 356531A US 35653153 A US35653153 A US 35653153A US 3257984 A US3257984 A US 3257984A
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US
United States
Prior art keywords
frame
barrel
cutter
rod
line
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 - Lifetime
Application number
US356531A
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English (en)
Inventor
Temple Robert
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.)
MSA Safety Inc
Original Assignee
Mine Safety Appliances Co
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 Mine Safety Appliances Co filed Critical Mine Safety Appliances Co
Priority to US356531A priority Critical patent/US3257984A/en
Priority to BE606209A priority patent/BE606209A/fr
Application granted granted Critical
Publication of US3257984A publication Critical patent/US3257984A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G7/00—Mine-sweeping; Vessels characterised thereby
    • B63G7/02—Mine-sweeping means, Means for destroying mines
    • B63G7/04—Mine-sweeping means, Means for destroying mines by means of cables

Definitions

  • This invention relates to explosive actuated devices, propelled by sweep lines through bodies of water, for cutting the lines by which explosivemines are anchored in the water.
  • FIG. 1 is a plan view of my cutting ap aratus, with one of the tools discharge
  • FIG. 2 is a side view taken from the left of FIG. 1;
  • FIG. 3 is an enlarged side view of One of the cutting tools shown in FIG. 1;
  • FIG. 4 is a central horizontal section through a tool
  • FIG. 5 is a view of the front end of a tool
  • FIG. 6 is a cross section taken on the line VIVI of FIG. 4.
  • each cutting tool has a metal frame 1 which extends at right angles to the sweep line 2, by which the tool is dragged through the water in the general direction of the arrow in FIG. 1.
  • the frame near the side that is nearest to the trailing end of the sweep line is provided with a barrel 3 that extends backward therein from the front end of the frame, as shown in FIG. 4.
  • a chisel-like cutter 4 is slidably mounted in the barrel, where it normally is held in retracted position by a shear pin 5 extending through it and the frame. The pin also keeps the cutter from turning in the barrel.
  • Behind the barrel the frame is provided with a bore 6 that receives an explosive cartridge 7.
  • the frame can be made narrower, and thus lighter, by locating the axis of this bore between the axis of the barrel and the adjacent side of the frame.
  • anvil 9 which has an integral leg lit at one end extending back to the frame.
  • the thickness of the rear end of the leg is reduced so that it can extend into a notch 11 in the front end of the frame between the barrel and the nearest side of the frame.
  • the notch and the leg extend laterally entirely across this portion of the frame so that the transversely curved inner surface of the leg forms part of the side wall of the front end of the barrel.
  • the notched portion of the frame projects outward beyond the rest of the frame to give the necessary width for the anvil leg.
  • a soft metal, threaded shear pin 12 extends through the frame and leg to hold them together.
  • a space 13 between the frame and the anvil and its leg forms a three sided recess for receiving and holding a mine anchor line 14 (FIG. 1) that is to be cut.
  • the free end of the anvil has a forwardly inclined integral guide member 15.
  • a firing mechanism is mounted in the rear end of the frame.
  • This mechanism includes a breech block 17 which is removably mounted in a rectangular recess 18 that extends entirely across the back portion of the frame and most of the way down through it.
  • the breech block fits snugly between the front and rear walls of this recess and has side flanges 19 (FIG. 3) that overlap and engage the opposite sides of the frame to hold the block against lateral movement.
  • the block is locked in place by means of a central screw 20 that extends through it and is threaded in the frame.
  • the block is provided near one side with a passage 21 in axial alignment with the cartridge, the front end of this passage being of materially reduced diameter and containing a firing pin 22, the rear portion of which is provided with four laterally projecting wings 23 that slidably engage the wall of the passage to center the pin without trapping water in the front end of the passage.
  • the pin is normally held in a retracted position by an encircling coil spring 2-1- compressed between the wings and the reduced end of the passage.
  • the rear ends of the top and bottom wings are extended back across the top and bottom of one end of a horizontal lever 26 that is disposed in a transverse slot 27 in the rear end of the breech block.
  • the central portion of the lever is pivotally mounted on a vertical pin 28.
  • the side of the breech block opposite to the firing pin" is provided with a passage 30 parallel to the firing pin pas sage and containing a piston 31 that has rearwardly extending ears 32 pivotally connected to the adjacent end of lever 26.
  • the piston extends only about half way through the passage. It will be seen that when the piston is moved backward, it will rock the lever on its pivot and thus force the firing pin forward against the cartridge, which thereby will be discharged to drive the cutter toward anvil 9.
  • the firing mechanism is so formed that it cannot be operated unless the piston passage 30 in front of the piston is full of water. This occurs only when the tool is in use.
  • a plunger 33 is mounted in the frame in axial alignment with the piston passage.
  • the plunger and passage have the same shape, preferably cylindrical, and substantially the same diameter.
  • the front end of the plunger is supported by an integral rectangular block 34 that is slidable lengthwise of the frame in a guiding slot or channel 36 which faces upward.
  • a rod 37 that is fastened to block 34 extends forward across a large side recess 38 in the frame and then slidably through the portion of the frame in front of that recess.
  • the rear end of the plunger is supported and guided by a collar 39, through which it slides.
  • This collar extends up through a slot 41') in the frame and its upward movement is limited by a shoulder 41 on its lower end, as shown in FIG. 3.
  • the slot extends across the channel and into its inner side wall. The collar is held in place by the plunger, and the plunger is held in alignment with piston 31 by means of the collar.
  • the plunger 33 is urged toward the breech block by a coil spring 43 encircling rod 37 and compressed between the plunger block 34 and the front wall of frame recess 38.
  • a pin 44 is inserted in the bottom of the frame near the front end of channel 36, into which it projects.
  • the plunger normally is held in retracted or forward position, with spring 43 compressed, by means of a rigid wire-like trigger 45 which extends through a hole through the projecting front end of the plunger rod.
  • a rigid wire-like trigger 45 which extends through a hole through the projecting front end of the plunger rod.
  • the frame is provided with a narrow slot 47 extending from the front end of the barrel across to the side of the frame opposite to anvil leg 10, and a portion of the trigger is disposed in this slot.
  • the trigger extends out of the slot and part way across the barrel and then is bent forward to extend across the cutting recess 13 in position to be struck by a mine anchor line.
  • the trigger is prevented from turning in the frame by providing the intermediate portion of the trigger with a for wardly bent section 48 that substantially engages the side walls of the frame slot.
  • plunger rod To prevent the trigger from wearing the frame around the front end of the rod, the latter can be encircled by a hard metal bushing 49 rigidly mounted in the frame and provided with a pair of radial holes in alignment with the hole through the rod.
  • the coil spring 43 drives the plunger back toward the breech block and into the piston passage as shown by the cutting tool at the left-hand side of the group of tools in FIG. 1.
  • the water in that passage is thereby forced by the plunger against the piston to move it backwards and thereby rock the lever to fire the cartridge.
  • the plunger will not strike the piston because the block 34 will strike collar 39.
  • a safety pin 50 can be inserted in the breech block and extended through a notch 51 in the side of one of the firing pin wings. Such a safety pin is removed just before the tool is lowered into the water.
  • each fin preferably has a body 55 attached to the sweep line 2, and a tail 56 for holding the fin substantially horizontal as it is dragged through the water.
  • the fin body has hooks 57 on its bottom that extend around the sweep line and are held in place by fasteners 58.
  • the back portion of the body is bent upward to form a rib 59 parallel to the sweep line.
  • Another shorter rib 60 may extend at right angles to the back rib at the end nearest the ship.
  • the tail part of the fin has its front end connected to the bottom of the body portion by rivets 61.
  • Four cutting tools are shown mounted on the body of the fin. One of them is against the short rib 60 and the others are placed side by side in engagement with each other.
  • the rear ends of the cutters engage the long rib 59 and they all are held in place by heavy screws 62 that extend through that rib and are threaded in holes 63 (FIG. 4) in the rear ends of the cutter frames.
  • the front ends of the cutter frames and fin project ahead of the sweep line a short distance, and mine anchor lines 14 are directed to the cutting tools by an inclined front edge 64 of the fin between the short rib 60 and the ship.
  • each anvil leg 10 engages the side of the cutting tool frame beside it.
  • its anvil leg When a tool is fired, its anvil leg is confined between the side of the cutter 4 and the adjoining frame, and therefore the anvil will be compelled to move straight ahead far enough for it to clear the anvil on the adjoining frame. This prevents the first anvil from being knocked sideways against the next anvil and thus separating the latter from its frame, as happened heretofore.
  • FIG. 1 the first tool is shown as it appears after it has been discharged. Its cutter and anvil are gone, so they did not interfere with anchor line 14 approaching the second tool where it will be severed as soon as it pushes trigger 45 out of the plunger rod.
  • the cutting apparatus disclosed herein is designed primarily for operation with small, slow moving mine sweepers where mechanical cutters will not operate. Accordingly, the new cutters have been reduced in size, weight and capacity for this specific purpose.
  • a mine anchor line cutting tool suitable for engagement by like tools in a group of parallel tools extending at right angles to a supporting sweep line comprising a frame having a front surface extending substantially straight across it from one side to the other, the frame being provided with a barrel extending backward from its front end near one side, an anvil spaced in front of the barrel and having at one end a rearwardly extending leg connected to the front part of the frame between said side and barrel, whereby a line-receiving recess is formed in front of the barrel, a cutter slidably mounted in the barrel, the frame being formed to support an explosive cartridge behind the cutter, means for detonating the cartridge to drive the cutter through an anchor line in said recess, said means including a rod slidably mounted in the frame parallel to said barrel and provided with a transverse passage through its front end adjacent to the front of the frame, a rigid trigger having one end slidably mounted in said passage for normally holding the rod in a forward position and having its other end extending forward across said reces
  • a cutting tool in accordance with claim 1 in which an intermediate portion of the trigger is disposed in a slot in the front end of the frame and is provided with a bent section substantially engaging the side walls of the slot to keep the trigger from turning in the rod.
  • a mine anchor line cutting tool suitable for engagement by like tools in a group of parallel tools extending at right angles to a supporting sweep line comprising a frame, a cutter slidably mounted therein, the frame being provided with a bore behind the cutter for receiving an explosive charge, a firing pin for exploding the charge to drive the cutter ahead, means adjacent the front end of the cutter for catching a mine anchor line and holding it in position for cutting, a pivoted lever having one end for moving the firing pin ahead, a piston in front of the other end of the lever for moving it backward, the frame being provided with a channel in front of and in line with the piston, a cylindrical plunger in the channel in axial alignment with the piston, a noncircular member joined to the front end of the plunger and slidably mounted in said channel, the wall of the channel being provided with a slot behind said member, a collar extending through the slot and across the channel and provided with a cylindrical opening slidably receiving the plunger, a compressed spring urging the plunger toward the piston,
  • a mine anchor line cutting tool suitable for engagement by like tools in a group of parallel tools extending at right angles to a supporting sweep line comprising a frame, a cutter slidably mounted therein, the frame being provided with a bore behind the cutter for receiving an explosive charge, a firing pin for exploding the charge to drive the cutter ahead, means adjacent the front end of the cutter for catching a mine anchor line and holding it in position for cutting, hydraulic pressure operated means for moving the firing pin ahead, the frame being provided with a channel parallel to said cutter, a plunger in the channel, a non-circular member joined to the front end of the plunger and slidably mounted in said channel, the wall of the channel being provided with a slot behind said member, a collar extending through the slot and across the channel and provided with an opening slidably receiving the plunger, a compressed spring urging the plunger toward the back of the frame, means for normally holding the plunger retracted, and means operable by a mine line for releasing the plunger to create said hydraulic pressure.
  • Mine anchor line cutting apparatus comprising a substantially horizontal fin, means at the front end of the fin for connecting it to a sweep line having a trailing end, a pair of parallel mine anchor line cutter frames mounted side by side on the fin with their front ends adjacent the front of the fin, each frame being provided with a barrel extending backward from its front end close to its side that will be nearest the trailing end of the sweep line, the front of each frame having a rearwardly extending notch in the portion of the frame between said side and barrel and extending laterally entirely across said portion, an anvil spaced from the front of each barrel and having a rearwardly extending leg fitting in said notch and extending entirely across it, whereby a line-receiving recess is formed in front of each barrel, a shear pin extending through each leg and frame to hold each anvil in place, the anvil leg farthest from the trailing end of the sweep line engaging the .adojoining side of the next frame, and a cutter slidably mounted in each barrel, the frames
  • Mine anchor line cutting apparatus in accordance with claim 6, wherein a rib extends across the top of said fin in contact with the rear ends of said frames, the rib and frames being provided with aligned openings, and screws extend through the rib openings and are threaded in the frame openings for holding the frames on the fin.
  • said fin has a horizontal body and a horizontal fin tail connected to the back part of said body, and the front of said body having means for connecting it to a sweep line and the back of the body being provided with an upright rib extending across it, the front ends of said frames being adjacent the front of said body and the rear ends of the frames engaging said rib, the rib and frames being provided with aligned openings, and screws extend through the rib openings and are threaded in the frame openings for holding the frames in place.

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
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US356531A 1953-05-21 1953-05-21 Mine anchor line cutters Expired - Lifetime US3257984A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US356531A US3257984A (en) 1953-05-21 1953-05-21 Mine anchor line cutters
BE606209A BE606209A (fr) 1953-05-21 1961-07-17 Dispositif de sectionnement de lignes d'ancrage de mines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US356531A US3257984A (en) 1953-05-21 1953-05-21 Mine anchor line cutters

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US3257984A true US3257984A (en) 1966-06-28

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* Cited by examiner, † Cited by third party
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CN113152455B (zh) * 2021-04-22 2024-12-13 中铁十局集团城市轨道交通工程有限公司 一种切除侵入车站基坑范围内的既有锚索的结构及处理方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422506A (en) * 1945-11-06 1947-06-17 Temple Velocity Equipment Inc Mine anchor-line cutter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422506A (en) * 1945-11-06 1947-06-17 Temple Velocity Equipment Inc Mine anchor-line cutter

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BE606209A (fr) 1965-10-06

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