US2236959A - Inertia element operated device - Google Patents

Inertia element operated device Download PDF

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Publication number
US2236959A
US2236959A US280200A US28020039A US2236959A US 2236959 A US2236959 A US 2236959A US 280200 A US280200 A US 280200A US 28020039 A US28020039 A US 28020039A US 2236959 A US2236959 A US 2236959A
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US
United States
Prior art keywords
pendulum
inertia element
inertia
casing
trip
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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
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US280200A
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English (en)
Inventor
Salmond Hubert Mackenzie
Mathisen Anders
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Graviner Manufacturing Co Ltd
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Graviner Manufacturing Co Ltd
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Publication date
Application filed by Graviner Manufacturing Co Ltd filed Critical Graviner Manufacturing Co Ltd
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Publication of US2236959A publication Critical patent/US2236959A/en
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    • 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
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/07—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch

Definitions

  • INERTIA ELEMENT OPERATED DEVICE Filed June 20, 1939 3 Sheets-Sheet 2 lnvenlur April 1, 1941- H. M. SALMOND ETAL INERTIA ELEMENT OPERATED DEVICE Filed June 20, 19159 3 Sheets-Sheet 3 Inventor y yfi a ittomcg M g y B Patented Apr. 1, 1941 UNITED STATES PATENT OFFICE INERTIA ELEMENT OPERATED DEVICE Hubert Mackenzie Salmond, Fareham, and Anders Mathisen, London,
  • the inertia element may take the form of a pendulum. ball element or mass, or it may be of any other convenient shape which is so arranged and disposed that when the device is subject to impact producing deceleration of specifled values, it efiects release 01' means for eflecting operation of the apparatus controlled.
  • the present invention more specifically relates to inertia operated devices comprising an inertia element or pendulum suspended from a universal character upon aircraft it is necessary to make periodic inspections and tests or the device and actuation and resetting of the device is desired without the necessity for applying impact to the device.
  • an inertia operated device comprising a suspended inertia element adapted for retaining a controlled member in a predetermined position and to release said memher when subjected to impact force or deceleration, is characterised by the provision of an auxiliary trip mechanism for actuating the inertia element to effect release oi the controlled member independently of an impact force or deceleration, said trip mechanism being operable to permit resetting of the inertia element into the position wherein it retains the controlled member.
  • means are provided which may be independent of but are preferably operable by the trip mechanism, and it is convenient to arrange that the latter mechanism itself can be moved subsequent to tripping of the inertia element to efiect positive resetting of the latter into its retaining position.
  • the universal joint suspension mechanism of the device is so arranged that when an element, actuated externally from the casing of the device, is forced eccentrically against the universal joint mechanism, the inertia element is displaced to permit release of a part of the controlled mechanism.
  • tests can be carried out and the device can normally be reset by moving the controlled mechanism into a position in which the inertia element re-engage said mechanism.
  • the universal Joint suspension mechanism of the device is so arranged that when an element, actuated externally from the casing of the device, is forced concentrically against the universal Joint mechanism, the inertia element is brought into its normal vertical position so as to permit ngagement by the controlled mechanism to reset the Figure 6 shows the application of the control bar to reset the pendulum.
  • controlled member is an electric switch, but it will be understood that the trip and reset mechanism now to be described may be applied to any suitable controlled memher.
  • a pendulum i is suspended by a pivot pin 2 from a rotatably mounted spindle 3 so that the pendulum can swing in any direction.
  • the controlled member is an electric switch, comprising fixed contact springs 3 mounted in the casing 5 and actuated by a cam 5 which is fixed upon a shaft 7.
  • a radial arm 8 Secured to the latter is a radial arm 8 which is controlled by a spring 9 so that it tends normally to swing anti-clockwise, see Figure 4.
  • the outer end of the arm 8 carries a pin 10, which, in the retaining position shown in the drawings, the inertia element comprised in the pendulum 1 engages in a conical recess in the bottom of the pendulum, the efiect of suflicient impact force or deceleration being to cause the recess to jump the pin ii) whereby the arm 8 can turn anti-clockwise and open the switch contacts.
  • the upper end ll of the pendulum is made moderately fiat according to the present invention and a combined trip and reset device provided uponthe casing for the mechanism substantially as follows. Above the axis 2 oi. the
  • a circular opening I2 in the casing 5 for the mechanism of the invention In the opening is rotatably mounted a T shaped pendulum actuating element IS, the horizontal bar Hi of which is positioned in the opening i2, whereas the stem Isa projects through a flanged guide disc i5 secured to the casing 5.
  • a projecting portion of the-stem is encircled by a spring It and an actuating knob ii is provided upon the end of the stem.
  • the spring It is under compression and tends to retain the bar portion i l of the T shaped element in the opening of the case away from the pendulum and resting upon the guide disc l5 as shown in Figure
  • the arrangements are such that when the bar i on the T shaped element is rotated to a position parallel with the axis oi the spindle 23 supporting the pendulum i, the bar, when pressed down against action of spring to, abuts eccentrically upon the upper end ll of the pendulum and tends to cause the pendulum to pivot away from its retaining position, i. e. the vertical.
  • pendulum I if pendulum I has been tripped, it will assume the position shown in full lines in Fig. 6, rather than the position shown in Fig, 5. Then even if lever arm 8 is rotated by shaft 1 from its tripped position shown in Fig. 5 to its set position shown in Fig. 6, pin 10 on arm 8 still will not engage the recess in the bottom of pendulum i while pendulum I is in the position shown in full lines in Fig. 6. If however bar [4, having been rotated as shown in Fig. 6 to lie across the top of pendulum end II, is now depressed, it will rotate pendulum i into the position shown in dotted lines in Fig. 6, in which position the pendulum recess is engageable with pin in. This makes possible test tripping and resetting with the plane on the ground as required in actual operation.
  • the spring IE can be enclosed as shown.
  • the combined trip andreset mechanism is capable of being mounted upon the casing of an existing device without requiring any modifications of the mechanism of the device, the guide disc l5 having set and trip" marking thereon as shown in Figure 2 to facilitate the manipulation of the device during testing.
  • the eccentricity of the T shaped element may be made so small that it is not readily possible to trip the device unless the pendulum engaging mechanism is moved out of engagement with the pendulum and by making suitable provision this is only possible by use of a special key, so that inadvertent or mischievous tripping of the device is not possible without application of excessive force.
  • the spring is anchored to a plate 2
  • is provided with a plurality of holes 22 arranged in the are of a circle any one of which can be engaged with a fixed pin 23 by suitable adjustment of the plate.
  • an inertia operated device an inertia element, a universal joint for suspending said inertia element, a controlled member, means actuatable by said inertia element adapted to normally retain said controlled member in a normal determined position and to release said controlled member from said normal position when said inertia element is subjected to impact or deceleration, a depressible test member for said inertia element, mounting means for mounting said test member depressibly and rotatably adjustable into two positions, said test member comprising a spring-controlled depressible stud element terminating in an enlarged head, said head being positioned to act eccentrically upon said universal joint and release said inertia element from normal position when said test member is depressed in its first said position and to act concentrically upon said universal joint and restore said tripped inertia element to normal position when said test member is depressed in its second said position.
  • An inertia operated device comprising a casing, an inertia element in the form of a pendulum suspended in the casing by a universal joint, a switch mechanism in said casing'including a switch control member normally engaging the pendulum so that the switch mechanism is retained in one position, said pendulum being adapted upon being subject to an impact force or deceleration to be released from the said member whereby the switch mechanism can move to another position, an auxiliary trip and reset element mounted on said casing so as to be adjustable into two positions, a trip position and a reset position, means whereby in the trip position, operation of the trip and reset element displaces the inertia element from engagement with the said switch control member to release the switch mechanism, and means by which in the reset position of the trip and reset member, operation of the latter restores the tripped inertia element to the retaining position.
  • An inertia operated device comprising a casing, an inertia element in the form of a pendulum suspended in the casing by a universal joint, a switch mechanism in said casing including a switch control member normally engaging the pendulum so that the switch mechanism is retained in one position said pendulum uponbeing subject to an impact force or deceleration being released from the said member whereby restore the same if tripped, when the trip and reset member is operated.
  • An inertia operated device comprising a casing, an inertia element in the form of a pendulum suspended in the casing by a universal joint, a switch mechanism in said casing including a switch control member normally engaging the pendulum so that the switch mechanism is retained in one position, said pendulum upon being subject to an impact force or deceleration being adapted to be released from the said member whereby the switch mechanism can move to another position, an auxiliary trip and reset member in the form of a spring controlled depressible stud mounted on the casing so as to be angularly adjustable into two positions, a trip position and a reset position, a head on said stud disposed above the universal joint suspension of the inertia element to engage the joint when the stud is depressed, said head having a trip surface and a reset surface, which upon depression of the stud engages the joint eccentrically or concentrically respectively to release or reset the inertia element depending upon the position of the stud.
  • an inertia element means for suspending said inertia element displaceably under impact, a controlled member mounted for retention in a normal position thereof by locking engagement with said inertia element in normal position of said inertia element, and separate displaceably adjustable two-position combined tripping and resetting means mounted to engage said inertia element and adapted when actuated in its first position to displace said inertia element from position of locking engagement with said controlled member and in its second position to positively restore said inertia element to position of locking engagement with said controlled member.
  • an inertia element having a mounting head, means for suspending said inertia element by its mounting head displaceably under impact, switch means adapted and mounted for retention in a normal position by locking engagement with said inertia element in normal position of said inertia element, and separate rotatably adjustable two-position combined tripping and resetting means comprising a terminal head and mounted linearly displaceably in substantially the direction of the vertical axis of said suspended inertia element in its normal position, said combined means being so mounted that in its first position when linearly displaced eccentrically it impinges on one side of said mounting head and displaces said inertia element from position of locking engagement with said switch means and in its second position when linearly displaced it applies restoring force to the entire said mounting head to thereby positively restore said inertia element to position of locking engagement with said controlled member.
  • a safety switch In a safety switch, a support, a first spindle rotatably mounted on said support, a second spindle mounted on said first spindle substantially at right angles thereto, a pendulum member suspended from said second spindle rotatably thereabout, switch means lockingly engageable with said pendulum member in a normal position thereof, and a combined tripping and resetting member longitudinally displaceably and rotatably mounted on said support and comprising a rod member mounted to extend longitudinally displaceably in the direction perpendicular to the plane containing the axes of said spindles but offset relative to the point of intersection of said axes, said combined member further comprising a head bar carried on its end adjacent said spindles and being so mounted that when said bar is rotated into a position parallel to said first spindle and depressed against said pendulum member it releases said pendulum member from normal locked position and that when said bar is rotated to a position substantially parallel to said second spindle and depressed against said pendulum member
  • a support a first spindle rotatably mounted on said support, a second spindle mounted on said first spindle substantially at right angles thereto, a pendulum member comprising a forked mounting portion which surrounds said second spindle for supporting said pendulum member rotatably from said second spindle, switch means lockingly engageable with said pendulum member in a normal position thereof, and a combined tripping and resetting member longitudinally displaceably and rotatably mounted on said support and comprising a rod member mounted to extend lormitudinally displaceably in the direction perpendicular to the plane containing the axes of said spindles but offset relative to the point of intersection of said axes to lie substantially in the axis of one fork of said pendulum member, said combined member further comprising a head bar carried 4 eeeeeae on its end adjacent said spindles.
  • said pendulum member from normal locked posl- 5 tion and further when said bar is rotated to e HUBERT MACKENZIE SOND. position substantially parallel to said second ANDERS MASEN.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Mechanical Control Devices (AREA)
  • Emergency Lowering Means (AREA)
US280200A 1938-06-28 1939-06-20 Inertia element operated device Expired - Lifetime US2236959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19120/38A GB516481A (en) 1938-06-28 1938-06-28 Improvements in inertia element operated devices

Publications (1)

Publication Number Publication Date
US2236959A true US2236959A (en) 1941-04-01

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US280200A Expired - Lifetime US2236959A (en) 1938-06-28 1939-06-20 Inertia element operated device

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US (1) US2236959A (fr)
FR (1) FR856373A (fr)
GB (1) GB516481A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2424390A (en) * 1944-06-24 1947-07-22 Usa Switch
US2920157A (en) * 1943-12-16 1960-01-05 Rabinow Jacob Inertia switch
US2949819A (en) * 1942-09-28 1960-08-23 Bell Telephone Labor Inc Toroidal lens device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2949819A (en) * 1942-09-28 1960-08-23 Bell Telephone Labor Inc Toroidal lens device
US2920157A (en) * 1943-12-16 1960-01-05 Rabinow Jacob Inertia switch
US2424390A (en) * 1944-06-24 1947-07-22 Usa Switch

Also Published As

Publication number Publication date
GB516481A (en) 1940-01-03
FR856373A (fr) 1940-06-12

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