US2942818A - Reefing or static line cutter - Google Patents
Reefing or static line cutter Download PDFInfo
- Publication number
- US2942818A US2942818A US688791A US68879157A US2942818A US 2942818 A US2942818 A US 2942818A US 688791 A US688791 A US 688791A US 68879157 A US68879157 A US 68879157A US 2942818 A US2942818 A US 2942818A
- Authority
- US
- United States
- Prior art keywords
- line
- cutter
- reefing
- parachute
- static 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
Links
- 230000003068 static effect Effects 0.000 title description 3
- 238000010304 firing Methods 0.000 description 9
- 239000004677 Nylon Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000002360 explosive Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D17/00—Parachutes
- B64D17/22—Load suspension
- B64D17/38—Releasable fastening devices between parachute and load or pack
- B64D17/386—Devices adapted to cut lines or straps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
- B23D15/12—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor
- B23D15/14—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor actuated by fluid or gas pressure
- B23D15/145—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor actuated by fluid or gas pressure actuated by explosion
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S30/00—Cutlery
- Y10S30/04—Explosive
Definitions
- This invention relates to an improved means for severing a line such as the reefing line of a parachute, and has for its principal object the provision of an improved line cutter which requires fewer parts and operates more simply than the devices heretofore provided for this purpose.
- the line cutter of the present invention has the important advantage that it is actuated in response to a predetermined tension in a shroud line of the parachute to which it is attached without the need of a compressed spring or any other such mechanical element for firing the cartridge which actuates the cutter.
- the cutter of the present invention may be actuated in response to a tension in the linewhich is to be cut.
- Fig. 1 is a sectional view of the improved line cutting device.
- Fig. 2 is an end view of the device.
- Fig. 3 is a side view of the device.
- Fig. 4 illustrates a detail of the device.
- the device of Fig. 1 includes an enclosure which is apertured at its left-hand end to receive a reefing line 11 of nylon or the like and is provided at its right-hand end with a transverse bridge 14 (see Fig. 3) on which is mounted a firing pin 13.
- Movable within the enclosure 10 is a member 15 which has at its left-hand end a cutter 16 and at its right-hand end a cartridge firing chamber 17.
- a plug 12 threaded into the left-hand end of the enclosure 10 is provided with a raised central part 18 to stop movement of the member 10 so that the edges of the circular cutter 16 do not contact the plug.
- the firing chamber 17 is shown as containing a cartridge which includes a charge 19, a delay element 20 and a primer 21.
- the movable member 15 is bifurcated to provide legs 22 and 23 (see Fig. 3) which straddle the bridge 14 of the enclosure 10.
- the legs 22 and 23 are apertured near their ends to receive a line 24 which may be a connection to shroud line of the 2,942,818 Patented June 28, 1960 parachute. Since the reefing line is attached to the parachute and the shroud line is connected to the load, the sudden pull produced by opening of the parachute is applied to the member 15 and opertes to shear the pin 26 which releasably couples the firing chamber 17 to the enclosure 10.
- a safety pin 25 is positioned as indicated in Fig. 2 and a shear pin 26 (see Fig. l) is utilized to couple the enclosure 10 and the member 15 together.
- a shear pin 26 is utilized to couple the enclosure 10 and the member 15 together.
- the cutter is preferably fixed to the parachute with its longitudinal dimension more or less alined with the shroud line when tensioned by the load. Exact positioning of the cutter, however, is not essential for the reason that the flexibility of the parachute fabric permits the cutter to aline itself with the applied force so that this force is applied to the member 15.
- connection 24 to the shroud line becomes taut as the load exerts a pull upon the parachute.
- the tensile force stored momentarily in the resilient nylon cord upon opening of said parachute is suflicient to shear the pin 26 and snap the primer 21 against the pin 13.
- the resulting impact,regulated by the size and composition of the shear pin 26, causes the primer 21 to fire. If the delay element 20 is used, it will burn for one second (or as long as desired) and then the main charge will ignite. This charge propels the cutter 16 which forcibly cuts the reefing line 11. Thereafter movement of the cutter is stopped by the raised portion of the plug 12 so that its sharp edge does not come into contact with the plug 12.
- one end of this line is attached to the legs 22 and 23 and its other end may be passed through the aperture in the left-hand end of the member 10 and provided with a knot to prevent it from slipping out of the aperature. Under these conditions, sufiicient tension in the reefing line will activate the cutter to sever this line in the manner heretofore set forth.
- a device for cutting a line in response to a pre- V the other end an aperture for receiving a first line to be cut, a member forming a firing chamber facing said firing pin, said member having at one end a cuter movable transversely of said aperture and at the other end a pair of legs which straddle said bridge and are formed to receive a second line for applying tension between'said member and said enclosure, and means coupling said member to said enclosure, said coupling means being severable upon the application of a predetermined tension to said second line.
- a device wherein said first line is a reefing line and said second line is a shroud line.
- a device according to claim 1 wherein said firing chamber encloses an explosive cartridge.
- a device according to claim 3 wherein said cartridge contains a time delay element.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Scissors And Nippers (AREA)
Description
J1me 1960 A. STQTT 2,942,818
REEFINC 0R STATIC LINE CUTTER Filed Get. 7, 1957 IN VEN TOR. ALBERT M. STOTT United States Patent REEFING 0R STATIC LINE CU'I'I'ER Albert M. Stott, 23 Albert Ave., Aldan-Clifton Heights, Pa.
The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment of any royalty thereon.
This invention relates to an improved means for severing a line such as the reefing line of a parachute, and has for its principal object the provision of an improved line cutter which requires fewer parts and operates more simply than the devices heretofore provided for this purpose.
Various types of line cutters have been proposed in the past. Many of these prior art devices have utilized the energy generated by the firing of a cartridge to actuate the cutter. Insofar as applicant is aware, however, all
such devices have involved the use of a spring, or some other mechanical element, to fire the cartridge which actuates the cutter.
The line cutter of the present invention has the important advantage that it is actuated in response to a predetermined tension in a shroud line of the parachute to which it is attached without the need of a compressed spring or any other such mechanical element for firing the cartridge which actuates the cutter. Alternatively, the cutter of the present invention may be actuated in response to a tension in the linewhich is to be cut.
The invention will be better understood from the following description when considered in connection with the accompanying drawings and its scope is indicated by the appended claims.
Referring to the drawings:
Fig. 1 is a sectional view of the improved line cutting device.
Fig. 2 is an end view of the device.
Fig. 3 is a side view of the device.
, Fig. 4 illustrates a detail of the device.
The device of Fig. 1 includes an enclosure which is apertured at its left-hand end to receive a reefing line 11 of nylon or the like and is provided at its right-hand end with a transverse bridge 14 (see Fig. 3) on which is mounted a firing pin 13.
Movable within the enclosure 10 is a member 15 which has at its left-hand end a cutter 16 and at its right-hand end a cartridge firing chamber 17. A plug 12, threaded into the left-hand end of the enclosure 10, is provided with a raised central part 18 to stop movement of the member 10 so that the edges of the circular cutter 16 do not contact the plug.
The firing chamber 17 is shown as containing a cartridge which includes a charge 19, a delay element 20 and a primer 21.
At its right-hand end, .the movable member 15 is bifurcated to provide legs 22 and 23 (see Fig. 3) which straddle the bridge 14 of the enclosure 10. The legs 22 and 23 are apertured near their ends to receive a line 24 which may be a connection to shroud line of the 2,942,818 Patented June 28, 1960 parachute. Since the reefing line is attached to the parachute and the shroud line is connected to the load, the sudden pull produced by opening of the parachute is applied to the member 15 and opertes to shear the pin 26 which releasably couples the firing chamber 17 to the enclosure 10. g
In the inactivated state of the line cutter, a safety pin 25 is positioned as indicated in Fig. 2 and a shear pin 26 (see Fig. l) is utilized to couple the enclosure 10 and the member 15 together. When the device is to be used, the safety pin 25 is withdrawn.
The cutter is preferably fixed to the parachute with its longitudinal dimension more or less alined with the shroud line when tensioned by the load. Exact positioning of the cutter, however, is not essential for the reason that the flexibility of the parachute fabric permits the cutter to aline itself with the applied force so that this force is applied to the member 15.
In the operation of the device as heretofore disclosed, the connection 24 to the shroud line becomes taut as the load exerts a pull upon the parachute. The tensile force stored momentarily in the resilient nylon cord upon opening of said parachute is suflicient to shear the pin 26 and snap the primer 21 against the pin 13. The resulting impact,regulated by the size and composition of the shear pin 26, causes the primer 21 to fire. If the delay element 20 is used, it will burn for one second (or as long as desired) and then the main charge will ignite. This charge propels the cutter 16 which forcibly cuts the reefing line 11. Thereafter movement of the cutter is stopped by the raised portion of the plug 12 so that its sharp edge does not come into contact with the plug 12.
If the device of the present invention is to be operated in response to tension in the reefing line, one end of this line is attached to the legs 22 and 23 and its other end may be passed through the aperture in the left-hand end of the member 10 and provided with a knot to prevent it from slipping out of the aperature. Under these conditions, sufiicient tension in the reefing line will activate the cutter to sever this line in the manner heretofore set forth.
I claim:
1. In a device for cutting a line in response to a pre- V the other end an aperture for receiving a first line to be cut, a member forming a firing chamber facing said firing pin, said member having at one end a cuter movable transversely of said aperture and at the other end a pair of legs which straddle said bridge and are formed to receive a second line for applying tension between'said member and said enclosure, and means coupling said member to said enclosure, said coupling means being severable upon the application of a predetermined tension to said second line.
2. A device according to claim 1 wherein said first line is a reefing line and said second line is a shroud line.
3. A deviceaccording to claim 1 wherein said firing chamber encloses an explosive cartridge.
4. A device according to claim 3 wherein said cartridge contains a time delay element.
References Cited in the file of this patent UNITED STATES PATENTS 2,742,697 Gross Apr. 24, 1956 2,755,550 Benjamin July 24, 1956
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US688791A US2942818A (en) | 1957-10-07 | 1957-10-07 | Reefing or static line cutter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US688791A US2942818A (en) | 1957-10-07 | 1957-10-07 | Reefing or static line cutter |
Publications (1)
Publication Number | Publication Date |
---|---|
US2942818A true US2942818A (en) | 1960-06-28 |
Family
ID=24765787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US688791A Expired - Lifetime US2942818A (en) | 1957-10-07 | 1957-10-07 | Reefing or static line cutter |
Country Status (1)
Country | Link |
---|---|
US (1) | US2942818A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3047261A (en) * | 1959-06-10 | 1962-07-31 | Victor G Bockelmann | Parachute disreefing device |
US3283406A (en) * | 1964-07-27 | 1966-11-08 | Maurice C Varin | Time-controlled triggering apparatus responsive to the tautening of a flexible member |
US3378218A (en) * | 1967-06-13 | 1968-04-16 | Kidde & Co Walter | Parachute deployment and disconnecting projectile |
US3991649A (en) * | 1975-06-27 | 1976-11-16 | Networks Electronic Corporation | Pyrotechnic wire cutter |
US4860698A (en) * | 1988-05-11 | 1989-08-29 | Networks Electronic Corp. | Pyrotechnic piston device |
US20050060892A1 (en) * | 2003-08-11 | 2005-03-24 | Jo Smolders | Parachute line cutting device |
US11472056B2 (en) * | 2019-02-21 | 2022-10-18 | Blue Water Concepts, Inc. | Rope severing device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2742697A (en) * | 1955-02-24 | 1956-04-24 | Gross Reinhold | Cutting implement |
US2755550A (en) * | 1955-10-07 | 1956-07-24 | Lockheed Aircraft Corp | Reefing line cutter |
-
1957
- 1957-10-07 US US688791A patent/US2942818A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2742697A (en) * | 1955-02-24 | 1956-04-24 | Gross Reinhold | Cutting implement |
US2755550A (en) * | 1955-10-07 | 1956-07-24 | Lockheed Aircraft Corp | Reefing line cutter |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3047261A (en) * | 1959-06-10 | 1962-07-31 | Victor G Bockelmann | Parachute disreefing device |
US3283406A (en) * | 1964-07-27 | 1966-11-08 | Maurice C Varin | Time-controlled triggering apparatus responsive to the tautening of a flexible member |
US3378218A (en) * | 1967-06-13 | 1968-04-16 | Kidde & Co Walter | Parachute deployment and disconnecting projectile |
US3991649A (en) * | 1975-06-27 | 1976-11-16 | Networks Electronic Corporation | Pyrotechnic wire cutter |
US4860698A (en) * | 1988-05-11 | 1989-08-29 | Networks Electronic Corp. | Pyrotechnic piston device |
US20050060892A1 (en) * | 2003-08-11 | 2005-03-24 | Jo Smolders | Parachute line cutting device |
US7207253B2 (en) * | 2003-08-11 | 2007-04-24 | B & B Controls | Parachute line cutting device |
US11472056B2 (en) * | 2019-02-21 | 2022-10-18 | Blue Water Concepts, Inc. | Rope severing device |
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