US3096268A - Arresting devices for falling bodies - Google Patents

Arresting devices for falling bodies Download PDF

Info

Publication number
US3096268A
US3096268A US665812A US66581257A US3096268A US 3096268 A US3096268 A US 3096268A US 665812 A US665812 A US 665812A US 66581257 A US66581257 A US 66581257A US 3096268 A US3096268 A US 3096268A
Authority
US
United States
Prior art keywords
cup
support head
arrester
control rod
fall
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
US665812A
Inventor
Lindsay Graham Eades
Waldron Sindey John Joslin
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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
Priority claimed from GB18362/56A external-priority patent/GB813584A/en
Application filed by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Application granted granted Critical
Publication of US3096268A publication Critical patent/US3096268A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C7/00—Control of nuclear reaction
    • G21C7/06—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section
    • G21C7/08—Control of nuclear reaction by application of neutron-absorbing material, i.e. material with absorption cross-section very much in excess of reflection cross-section by displacement of solid control elements, e.g. control rods
    • G21C7/20—Disposition of shock-absorbing devices ; Braking arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/12—Vibration-dampers; Shock-absorbers using plastic deformation of members
    • F16F7/127—Vibration-dampers; Shock-absorbers using plastic deformation of members by a blade element cutting or tearing into a quantity of material; Pultrusion of a filling material
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • FIG. 1 is an elevation of one part of the device.
  • the broaching cutter 8 is carried by the impact pin 7 which has two parts, i.e., an upper part 24 bearing in the adaptor 19 and a lower part 25 bearing in the bearing sleeve 22.
  • the broaching cutter 8 is carried on the part 24 of the impact pin 7 and rests against a step 26 between the two parts 24 and 25.
  • the part 25 of the impact pin 7 projects from the bearing sleeve 22.
  • a stop in the form of a washer 27 and a nut 28 is carried on the end 29 of the impact pin 7 where it projects from the adaptor 19.
  • the control rod 1 then continues to fall freely until the downwardly projecting impact pin 7 of the broach strikes an impact stool 32 situated at the foot of the control rod channel.
  • the im pact pin 7 is arrested by the impact stool 32 and due to the impact the broaching cutter 8 is forced along the liner 9.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Vibration Dampers (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Description

July 2, 1963 G. E. LINDSAY ETAL ARRESTING DEVICES FOR FALLING BODIES Filed June 14, 1957 GRAHAM EADES LINDSAY SIDNEY JOHN J OSLIN WALDRON Inventors Attorneys ARRESTHNG DEVIQES FOR FALLING BODIES Graham Eades Lindsay, London, and Sidney John J slin Waldron, Harwell, England, assignors to United Klugdom Atomic Energy Authority, London, England Filed June 14, 1957, Ser. No. 665,812 Claims priority, application Great Britain June 14, 1956 3 (Ilaims. (Cl. 204-1932) This invention relates to arresting devices for falling bodies.
In a nuclear reactor having vertically suspended control or shut off rods, the possibility of the failure of the means supporting the control rods with consequent damage when the control rods fall has to be considered.
It is an object of the present invention toprovide means to arrest a falling body in one or more stages depending on the circumstances of the fall so that large impact forces are avoided.
According to the invention, a device for arresting a falling body comprises in combination with the body an impacting member, a vertically resilient means coupling the impacting member and the body yieldable linking means such as a coupling releasable when the load in the vertically resilient means exceeds a predetermined amount to allow the body to continue its fall free of the impacting member and energy dissipating means for finally arresting the body.
An arresting device in accordance with the invention will now be described with reference to the accompanying drawings. In the drawings:
FIG. 1 is an elevation of one part of the device.
FIG. 2 is an elevation in section of the other part of the device.
Referring to the drawings there is shown a control rod 1 which has associated with it an arresting device comprising two principal parts, first at the top of the control rod 1 (FIG. 1), a spring 2 which acts between an arrester cup 3 and a ring 4 secured to the control rod 1 via shear pins 5 and a control rod support head 6 of cylindrical form. Second (FIG. 2) at the bottom of the control rod a broaching arrester mechanism comprising an impact pin 7 carrying a broaching cutter 8 movable in a free cutting stainless steel liner 9 held within a body tube 10' mounted on the control rod 1.
Referring to FIG. 1 in more detail the control rod 1 is attached to the support head 6 by a shank 11 formed integral with the support head 6. The shank 11 is screwed in a threaded hole 12 in the upper end of the control rod 1. The support head 6 has an integral lifting eye 13 and a conical flange 14 divides the support head 6 from the shank 11. The arrester cup 3 has a conical impacting face 15 formed round its base. A hole 16 in the base of the cup 3 and an aperture 17 defined by a ring 18 welded to the upper end of the cup 3 allow it to slide on the support head 6 against the loading of the spring 2.
Considering FIG. 2 in more detail the body tube 10 of the broaching arrcster mechanism has an end adaptor 19 which is screwed into the lower end of the control rod 1. The free cutting stainless steel liner 9 is held within the body tube 10 between an internal end face 20 of the adaptor 19 and an internal end face 21 of a bearing sleeve 22 which is screwed into the lower end of the body 10. The liner 9 has internal grooves 30. The broaching cutter 8 is ring shaped and has six equally spaced external cutting edges. The cutter 8 is held within the liner 9 and its end 23 adjacent to the bearing sleeve and is fitted into the liner 9 by prebroaching the liner 9 fora short distance from the end 23. The broaching cutter 8 is carried by the impact pin 7 which has two parts, i.e., an upper part 24 bearing in the adaptor 19 and a lower part 25 bearing in the bearing sleeve 22. The broaching cutter 8 is carried on the part 24 of the impact pin 7 and rests against a step 26 between the two parts 24 and 25. The part 25 of the impact pin 7 projects from the bearing sleeve 22. A stop in the form of a washer 27 and a nut 28 is carried on the end 29 of the impact pin 7 where it projects from the adaptor 19.
The operation of the device will now be described with reference to the case of a control rod falling into a vertical control rod channel of a nuclear reactor from an initial position in which the control rod is suspended with its lower end passing through a hole in a charge pan situated on the top of the core of the reactor. At the start of the fall the conditions shown in the drawings apply.
The control rod 1 falls until the conical face 15 of the cup 3 hits a complementary face 31 formed around the edge of the hole in the charge pan through which the control rod 1 is falling. The cup 3 is thus arrested by the charge pan and the kinetic energy of the falling control rod 1 is absorbed as the compression spring 2 is compressed between the cup 3 and the ring 4 carried by the support head 6. The load which is set up in the compression spring 2 is taken by the shear pins 5 which couple the ring 4 with the support head 6. If this load now exceeds an amount determined by the shear strength of the shear pins 5 they fail and the control rod 1 and associated support head 6 fall away from the cup 3, compression spring 2 and ring 4. The control rod 1 then continues to fall freely until the downwardly projecting impact pin 7 of the broach strikes an impact stool 32 situated at the foot of the control rod channel. The im pact pin 7 is arrested by the impact stool 32 and due to the impact the broaching cutter 8 is forced along the liner 9.
The liner 9 is cut as the broaching cutter 8 is forced along it and as the kinetic energy of the falling control rod 1 is dissipated in the broaching operation the control rod 1 is finally decelerated to rest.
It will be seen that if the control rod 1 falls from a position such that the cup 3 receives only a moderate impact on being arrested by the charge pan the shock of the fall will be absorbed in the compression spring 2 without fracture of the shear pins 5 and the control rod 1 will be arrested at this point with no damage. However, if the impact is more serious, damage is confined to the shear pins 5 and the liner 9 which can easily be replaced. The liner 9 is provided with internal grooves 30 to ensure that the cuttings produced are in the form of chippings which will not cause jamming of the breach.
We claim:
1. A body adapted to be suspended vertically and to extend through an aperture in a fixed structure having an upper complementary face and a lower impact stool, a support head fixed to the upper end of said body, an arrester cup having an inner vertical bore through which said support head extends, said arrester cup having a face on its outer surface adapted to engage with said complementary face for arresting the fall of said arrester cup, vertically resilient means fixed inside said arrester cup, yieldable linking means connecting said support head to said resilient means and adapted to yield and release said support head and body to fall free of the cup and resilient means when the force across said linking means increases to a predetermined magnitude, and energy absorbing means at the lower end of said body adapted to engage with said lower impact stool to absorb the energy of the free fall of said support head and body.
2. The apparatus claimed in claim 1 wherein said means at the lower end of said body for absorbing the energy of free fall comprises an impact pin, a broaching cutter carried by the impact pin and held within a free cutting References Cited in the file of this patent UNITED STATES PATENTS Kuller Oct. 24, 1911 Pegard Oct. 28, 1952 Reynolds May 26, 1953 Butler Oct. 26, 1957 Greenhalgh et al Mar. 10, 1959

Claims (1)

1. A BODY ADAPTED TO BE SUSPENDED VERTICALLY AND TO EXTEND THROUGH AN APERTURE IN A FIXED STRUCTURE HAVING AN UPPER COMPLEMENTARY FACE AND A LOWER IMPACT STOOL, A SUPPORT HEAD FIXED TO THE UPPER END OF SAID BODY, AN ARRESTER CUP HAVING AN INNER VERTICAL BORE THROUGH WHICH SAID SUPPORT HEAD EXTENDS, SAID ARRESTER CUP HAVING A FACE ON ITS OUTER SURFACE ADAPTED TO ENGAGE WITH SAID COMPLEMENTARY FACE FOR ARRESTING THE FALL OF SAID ARRESTER CUP, VERTICALLY RESILIENT MEANS FIXED INSIDE SAID ARRESTER CUP, YIELDABLE LINKING MEANS CONNECTING SAID SUPPORT HEAD TO SAID RESILIENT MEANS AND ADAPTED TO YIELD AND RELEASE SAID SUPPORT HEAD AND BODY TO FALL FREE OF THE CUP AND RESILIENT MEANS WHEN THE FORCE ACROSS SAID LINKING MEANS INCREASES TO A PREDETERMINED MAGNITUDE, AND ENERGY ABSORBING
US665812A 1956-06-14 1957-06-14 Arresting devices for falling bodies Expired - Lifetime US3096268A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB18362/56A GB813584A (en) 1956-06-14 Improvements in or relating to arresting devices for falling bodies

Publications (1)

Publication Number Publication Date
US3096268A true US3096268A (en) 1963-07-02

Family

ID=10111173

Family Applications (1)

Application Number Title Priority Date Filing Date
US665812A Expired - Lifetime US3096268A (en) 1956-06-14 1957-06-14 Arresting devices for falling bodies

Country Status (5)

Country Link
US (1) US3096268A (en)
BE (1) BE558296A (en)
DE (1) DE1079236B (en)
ES (1) ES236009A1 (en)
FR (1) FR1195220A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3232383A (en) * 1962-03-26 1966-02-01 Moberg Harald A Son Energy absorbing means
US3653468A (en) * 1970-05-21 1972-04-04 Gailen D Marshall Expendable shock absorber
US3863770A (en) * 1973-04-11 1975-02-04 Westinghouse Electric Corp Method and apparatus for handling an irradiated fuel assembly
US4104118A (en) * 1975-11-26 1978-08-01 General Atomic Company Shock absorber
WO1980000479A1 (en) * 1978-08-14 1980-03-20 Goodyear Aerospace Corp Brake adjuster having multi-sided internal broach
US4337852A (en) * 1980-05-23 1982-07-06 Exxon Research & Engineering Co. Load control link
US4341291A (en) * 1980-05-23 1982-07-27 Exxon Research & Engineering Co. Load control link
US5974852A (en) * 1998-01-20 1999-11-02 Daimlerchrysler Corporation Lifter unit for transfer die
US20130175028A1 (en) * 2012-01-09 2013-07-11 Baker Hughes Incorporated Downhole Shock Absorber with Guided Crushable Nose

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1006567A (en) * 1910-11-04 1911-10-24 Charles V Kuller Automatic locking break-pin.
US2615373A (en) * 1949-02-15 1952-10-28 G S P Soc Atel Safety stopping device for movable machine-tool members
US2639913A (en) * 1950-04-10 1953-05-26 Reynolds Decelerator Company Crash decelerator
US2811385A (en) * 1951-09-06 1957-10-29 Clifford L Butler Shock dissipating device
US2877170A (en) * 1955-08-24 1959-03-10 Greenhalgh Frank Geoffrey Support device for use in a nuclear reactor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1006567A (en) * 1910-11-04 1911-10-24 Charles V Kuller Automatic locking break-pin.
US2615373A (en) * 1949-02-15 1952-10-28 G S P Soc Atel Safety stopping device for movable machine-tool members
US2639913A (en) * 1950-04-10 1953-05-26 Reynolds Decelerator Company Crash decelerator
US2811385A (en) * 1951-09-06 1957-10-29 Clifford L Butler Shock dissipating device
US2877170A (en) * 1955-08-24 1959-03-10 Greenhalgh Frank Geoffrey Support device for use in a nuclear reactor

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3232383A (en) * 1962-03-26 1966-02-01 Moberg Harald A Son Energy absorbing means
US3653468A (en) * 1970-05-21 1972-04-04 Gailen D Marshall Expendable shock absorber
US3863770A (en) * 1973-04-11 1975-02-04 Westinghouse Electric Corp Method and apparatus for handling an irradiated fuel assembly
US4104118A (en) * 1975-11-26 1978-08-01 General Atomic Company Shock absorber
WO1980000479A1 (en) * 1978-08-14 1980-03-20 Goodyear Aerospace Corp Brake adjuster having multi-sided internal broach
US4214650A (en) * 1978-08-14 1980-07-29 Goodyear Aerospace Corporation Brake adjuster having multi-sided internal broach
US4337852A (en) * 1980-05-23 1982-07-06 Exxon Research & Engineering Co. Load control link
US4341291A (en) * 1980-05-23 1982-07-27 Exxon Research & Engineering Co. Load control link
US5974852A (en) * 1998-01-20 1999-11-02 Daimlerchrysler Corporation Lifter unit for transfer die
US20130175028A1 (en) * 2012-01-09 2013-07-11 Baker Hughes Incorporated Downhole Shock Absorber with Guided Crushable Nose
US8820402B2 (en) * 2012-01-09 2014-09-02 Baker Hughes Incorporated Downhole shock absorber with guided crushable nose

Also Published As

Publication number Publication date
ES236009A1 (en) 1957-12-16
BE558296A (en)
DE1079236B (en) 1960-04-07
FR1195220A (en) 1959-11-16

Similar Documents

Publication Publication Date Title
US3794277A (en) Earthquake resistant support
US3096268A (en) Arresting devices for falling bodies
US3532379A (en) Crashload attenuating aircraft crewseat
US2961204A (en) Deceleration device
JP2010539509A (en) Load indicator
US2877170A (en) Support device for use in a nuclear reactor
JP6181067B2 (en) Reactor assembly comprising nuclear fuel and a system for activating and inserting at least one neutron absorption and / or mitigation element
CN114207738A (en) Nuclear reactor melt localizing apparatus
RU2522587C1 (en) Anti-explosion panel of corrosion resistant alloy type
US6738447B1 (en) High energy absorption top nozzle for a nuclear fuel assembly
US3354990A (en) Impact absorbing device
US4061535A (en) Industrial technique
GB905836A (en) Improvements in or relating to shock absorbing devices
US3227624A (en) Control rod for nuclear reactors
US3144918A (en) Shock absorbers
CN201872951U (en) Impact-type separation protective device
CN207889204U (en) Fly press sliding block backhaul safety guard
RU2558825C1 (en) Explosion-proof panel of csss type
US4289043A (en) Protective device for an inertia wheel rotating
CN202390048U (en) Lift overhaul safety device
GB813584A (en) Improvements in or relating to arresting devices for falling bodies
RU2638368C1 (en) Anti-explosion panel with safety sleeve
SE183279C1 (en)
CN217237952U (en) Carbon monitoring device for monitoring carbon emission
US3335982A (en) Impact absorbing devices