US2235481A - Speed governor - Google Patents

Speed governor Download PDF

Info

Publication number
US2235481A
US2235481A US110312A US11031236A US2235481A US 2235481 A US2235481 A US 2235481A US 110312 A US110312 A US 110312A US 11031236 A US11031236 A US 11031236A US 2235481 A US2235481 A US 2235481A
Authority
US
United States
Prior art keywords
governor
spring
centrifugal
mass
contact
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
US110312A
Other languages
English (en)
Inventor
Hennig Fritz
Wusteney Herbert
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.)
Siemens and Halske AG
Siemens Corp
Original Assignee
Siemens Corp
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 Siemens Corp filed Critical Siemens Corp
Application granted granted Critical
Publication of US2235481A publication Critical patent/US2235481A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/06—Switches operated by change of speed
    • H01H35/10—Centrifugal switches

Definitions

  • the present invention relates to rotary speed governors of the type which operate an electric contact in response to rotation above a predetermined speed by virtue of the centrifugal force exerted by a rotating mass; and particularly the present invention relates to such governors wherein the contacts to be controlled also rotate with the governors.
  • the detrimental influences of the alterations above listed as (1) and (2) are avoided by designing the spring which opposes the centrifugal action of the mass so that at the desired critical speed the centrifugal force of the rotating mass is in balance with the force of the spring not only at one possible equilibrium position, but also in every position within the range of motion of thecentrifugal weight which operates the contacts.
  • the spring which opposes the centrifugal force is chosen in accordance with well known principles so that at the desired operating speed of the governor the force of the spring and the centrifugal force of the rotating mass will be in balance not only in one of the possible positions of the mass but rather universally in all possible positions within the range of outward movement of the mass.
  • the spring with respect to the centrifugal governor arm so as to ive an indeterminate balance or balance in any position within the range as above described, it may in some cases be impossible or impracticable by reason of constructional limitations, to dimension the spring exactly in accordance with such principles.
  • the arm carrying the contact should be arranged to have the largest possible movement for a given movement of the governor arm because with such design the displacement of the normalposition of the governor arm is minimized for a given amount of wearing away of the contact.
  • the detrimental influence caused by the alteration listed under (3) above namely, the variation of the mass of the centrifugal member by dissipation of material from the movable contact point, is avoided by positioning the movable contact so that its centrifugal force is zero or at least produces no components in the direction of the spring force.
  • the movable contact can, for example, be arranged in the plane determined by the main axis of rotation of the governor and the pivot of the governor arm. An alteration of the contact mass by the dissipation of material will therefore exercise no influence on the speed of rotation at which the governor operates.
  • this mass will be in a state of indeterminate balance whenever the governor is rotated at its critical speed, i. e. the mass will be capable of-remaining in equilibrium in any possible position within its range of movement, and as a result of this indeterminateness of position it is possible that under certain operating conditions when there is low rotational speed, small moments of inertia of the governor levers, or intermittent loading of the governed equipment, an irregular operation of the governor may be produced as a result of the considerable freedom of movement of the centrifugal weight.
  • the freedom of movement of the centrifugal weight can, in accordance with another feature of my invention, be decreased to a very small value by means of an inertia member mounted for free rotation and so associated with the centrifugal mass of the governor that the inertia member is moved together with the centrifugal.
  • Fig. 1 is a plan view of the governor arrangement in accordance with an embodiment of the invention without the provision of the impact stop
  • Fig, 2 is a plan view of a novel backstop for use with a centrifugal governor in accordance with my invention the major part of the contact apparatus being removed for clearness
  • Fig. 3 is an elevation of the novel stop mechanism viewed from the direction indicated by the line 3-3 of Fig. 2.
  • the centrifugal force contact governor of the present invention fundamentally consists of a support disc I, which is fastened to shaft 2 which is to be regulated.
  • the governor lever 3 is formed as a bell-crank pivoted at the pivot 4 and one arm thereof carries the centrifugal weight 5,the movable contact 6 being'arranged on the other arm.
  • the spring 8 is fastened at one end to the point 9 on the governor plate and at its other end to the point III of the contact lever 3, so as to oppose the centrifugal force of the contact lever.
  • Arrows H and I2 indicate the direction of the spring force and the centrifugal force.
  • the spring 8 is so chosen as to strength
  • the governor accordingly operates in a state of indeterminant balance, that is, it is in balance regardless of its position so that even upon an alteration in the position of the governor lever 3 produced by wear in contacts 6 and I the condition of balance is maintained at the same operating speed. It is advantageous that spring 8 should be fastened to the centre of gravity of the governor lever 3.
  • the contact I is fixed on to the plate I in such a position that when the contact closes the movable contact 6 lies in the plane defined by the axis 2 and the.
  • Fig. 2 illustrates an embodiment offthe selfstop, being arranged to engage the impact pin it, which is mounted on the governor lever 3.
  • the plate l8 has mounted on it the lever 2
  • the centrifugal weight 24 is provided, which when pressed outwards by the centrifugal force, rotates around its pivot 25 fastened to the, governor base plate I.
  • Fig. 3 plate I8 is shown, together with spring 21 and the centrifugal weight 24 in side view, in order to make the operation of the centrifugal weight 24 clearer and to show the mode of locking.
  • a centrifugal force contact governor for per. forming a switching operation at a given critical speed comprising a rotatable member, a weight mounted on said member for movement over a working range of motion by centrifugal force, a
  • a centrifugal force contact governor in accordance with claim 1,'further comprising stop means for limiting said range of movement of said weight, and adjusting means being operative upon cessation of rotation of said member for adjusting the position of said stop means relative to the at rest position of said weight.
  • a lever pivoted on said member for rocking about a pivot axis.
  • a weight fixed to said lever for movement'over a working range of motion by centrifugal force
  • a spring operatively connected with said lever opposing said centrifugal force, said spring being so dimensioned with respect to the mass of said weight and the mechanical advantage of said operative connection that a balance between the centrifugal force and the spring force is established at said critical speed substantially independently of the position within said range of movement of said centrifugal weight
  • a contact carried by said rotatable member and a further movable contact cooperating with said first contact and movable with respect thereto in response to rocking of said lever resulting from movement of said weight within said range of movement, said movable contact being positioned substantially in line with said two axes whereby the centriiugal force of said movable contact produces substantially no component oi. force tending to rock said lever.

Landscapes

  • High-Pressure Fuel Injection Pump Control (AREA)
  • Transmissions By Endless Flexible Members (AREA)
  • Valve Device For Special Equipments (AREA)
US110312A 1935-11-12 1936-11-11 Speed governor Expired - Lifetime US2235481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES120427D DE675684C (de) 1935-11-12 1935-11-12 Fliehkraftkontaktregler, bei dem der bewegte Kontakt und die Fliehmasse starr miteinander verbunden sind

Publications (1)

Publication Number Publication Date
US2235481A true US2235481A (en) 1941-03-18

Family

ID=27770822

Family Applications (1)

Application Number Title Priority Date Filing Date
US110312A Expired - Lifetime US2235481A (en) 1935-11-12 1936-11-11 Speed governor

Country Status (6)

Country Link
US (1) US2235481A (en(2012))
AT (1) AT150919B (en(2012))
DE (1) DE675684C (en(2012))
FR (1) FR813165A (en(2012))
GB (1) GB470681A (en(2012))
NL (1) NL43653C (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921156A (en) * 1957-01-30 1960-01-12 A M Company Governor body
US3202780A (en) * 1960-11-22 1965-08-24 Int Standard Electric Corp Centrifugal speed governor which minimizes the effect of contact erosion

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921156A (en) * 1957-01-30 1960-01-12 A M Company Governor body
US3202780A (en) * 1960-11-22 1965-08-24 Int Standard Electric Corp Centrifugal speed governor which minimizes the effect of contact erosion

Also Published As

Publication number Publication date
DE675684C (de) 1939-05-13
NL43653C (en(2012))
FR813165A (fr) 1937-05-27
GB470681A (en) 1937-08-19
AT150919B (de) 1937-10-11

Similar Documents

Publication Publication Date Title
US2427239A (en) Control device
US2235481A (en) Speed governor
US3244832A (en) Centrifugal mechanism and switch construction
US1459394A (en) Centrifugal governor
US2412347A (en) Speed governor switch
US3532914A (en) Integral governor for electric motor
US2196434A (en) Device for regulating the speed of electric motors
US2844782A (en) Power transmission units with thermal overload cutout
US2247492A (en) Speed responsive mechanism
US1982000A (en) Electrical speed governor
US3035665A (en) Deceleration responsive brake
US2175837A (en) Velocity governor with anticipatory action
US1868616A (en) Speed governor
US2532345A (en) Speed governor for motors
US2421213A (en) Centrifugal operated switch
US2894439A (en) Tractive indicator for automatic aperture controllers
US3400697A (en) Speed control device
US742842A (en) Automatic governor.
US2463659A (en) Centrifugally nonresponsive electrical snap switch
US2433885A (en) Springless governor
US3950626A (en) Rotary centrifugally-operated electrical switch for motors
US2205257A (en) Centrifugal governor with large anticipation
US3340452A (en) Electric motor with automatic speed control by centrifugal means
US2094247A (en) Clutch mechanism
US2365657A (en) Centrifugal motor speed governor having inertia effect