US3680665A - Brakes - Google Patents

Brakes Download PDF

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Publication number
US3680665A
US3680665A US65186A US3680665DA US3680665A US 3680665 A US3680665 A US 3680665A US 65186 A US65186 A US 65186A US 3680665D A US3680665D A US 3680665DA US 3680665 A US3680665 A US 3680665A
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US
United States
Prior art keywords
brake
shaft
rotatable
cam
resilient connection
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
US65186A
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English (en)
Inventor
Richard William Harris
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3680665A publication Critical patent/US3680665A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
    • F16D51/46—Self-tightening brakes with pivoted brake shoes, i.e. the braked member increases the braking action

Definitions

  • ABSTRACT A brake for slowing down a reel of wrapper web when the demand for the web by the wrapping machine diminishes.
  • the shaft of the reel of the web carries around with it by means of a spring a mounting for a brake arm.
  • a cam on the reel shaft bears against a cam follower caused by the brake arm to apply the brake. Due to the spring, deceleration of the reel shaft (caused by diminished tension in the wrapper web) al- I lows the cam to rotate relative to the follower so that the brake is applied harder.
  • the present invention relates to brakes and more particularly to brakes designed to inhibit overrunning of a rotating member.
  • a web of wrapping material is unwound from a reel for use in the wrapping machine. If for any reason the wrapping machine stops, for example due to jamming or to cure a fault, then the momentum already im- -parted to the reel by the web being drawn from it and into the wrapping machine would normally cause the reel to continue rotating after the wrapping machine had stopped and after the web had stopped being consumed by the wrapping machine, with the result that the web would unwind from the reel and form into folds or generally become snarled up between the reel and the wrapping machine.
  • the present invention provides a brake which can be used to prevent the reel overrunning when the web is no longer being drawn off the reel.
  • a brake comprising a stationary brake drum, a rotatable shaft to be braked and coaxial therewith, a brake mounting member rotatable about the axis of the shaft and driven therefrom by a first resilient connection, a brake arm pivoted on the rotatable brake mounting member and carrying a brake shoe to engage with the brake drum, a cam carried by the shaft, and a cam follower carried from the brake arm by a second resilient connection, the cam being shaped so that deceleration of the shaft with respect to the rotatable member causes the cam follower to-ride up the cam and increase the braking pressure, and vice versa.
  • the rotatable shaft may carry a flange with a circumferential groove, the first resilient connection being a coil spring connected at one end to the rotatable member and at its other end to the flange, and resting in the groove.
  • the second resilient connection may be a spring blade secured at one end to the rotatable member and carrying the cam follower.
  • FIG. 1 is a side elevational view of a brake according to the invention.
  • FIG. 2 is a section taken on the line A-A of FIG. I.
  • the brake comprises a brake drum 1 which is mounted on a fixed member 2 so that the drum is stationary.
  • a brake shoe 3 is carried on a brake arm 4 which is pivotally mounted at 5 on a plate 6.
  • the plate 6 is carried by bearings 7 on a rotatable input shaft 8 which is itself supported in bearings 9 within a portion of the fixed member 2.
  • the rotary input member of shaft 8 carries a cam 10 which is engaged by a cam follower in the form of a roller 1 l.
  • the roller 11 is carried on a resilient blade 12 which has one end 12a secured to the brake arm 4.
  • An adjustable screw 27 carried by the brake arm 4 urges the resilient blade 12 towards the cam 10 in order to maintain the roller 11 in contact with the cam surface.
  • the left hand end, as viewed in FIG. 2, of the input shaft 8 is formed with a head 13.
  • a tension coil spring 14 has one end secured at 15 to the plate 6 and the other end secured to a mounting 16 carried by the head 13 of the input shaft 8.
  • the coil spring 14 locates'in a groove 26 formed in the periphery of the head 13.
  • a stop 17 is carried by the plate 6 and is adapted to be engaged by a stud 18 which is secured in an arcuate slot 19 in the head 13; the position of the stud 18 along the slot 19 is adjustable by means of a threaded head which is screwed into the stud.
  • the purpose of the stud 18 and the stop 17 is to limit the amount that the plate 6 can rotate anti-clockwise relatively to the head 13, as viewed in FIG. 1.
  • the input shaft 8 carries a reel of wrapping material 20.
  • the reel has a hub 21 with an integral end plate 21a, the hub 21 being keyed, splined or otherwise arranged to rotate with the shaft 8.
  • the web of wrapping material 20 is wound on a tube 22 which is slid on to the hub 21 so that spikes 23 carried by the hub 21 are impaled in the end of the tube 22, which in this case is made of cardboard.
  • the wrapping material is held in position on the hub 21 by a removable end plate 24 which is held in position by a nut 25 which is threaded on to the end of the shaft 8.
  • the cam member 10 although circular, has its center offset with respect to the axis of the shaft 8 so that any rotation of the shaft 8 with respect to the plate 6 will result in the cam surface of the cam 10 moving with respect to the cam follower 11 and in particular will result in radial movement of the cam follower 11 with respect to the axis of the shaft 8.
  • the effect of the anti-clockwise movement of the plate 6 with respect to the head l3, and the radially outward movement of the roller 11 is to cause the brake-arm 4 to rotate anti-clockwise about its pivot 5 and bring the brake shoe 3 into contact with the brake drum 1 to brake the reel of wrapping material 20.
  • the brake of the invention has been desire to secure by brake mounting member rotatable about the axis of the shaft and driven therefrom by a first resilient connection, a brake arm pivoted 'on the rotatable brake mounting member and carrying a brake shoe to engage with the brake drum, a cam carried by the shaft, and a cam follower carried from the brake arm by a second resilient connection, the cam being shaped so that deceleration of the shaft with respect to the rotatable member causes the cam follower to ride up the cam and increase the braking pressure, and vice versa.
  • the first resilient connection being a coil spring connected at one end to the rotatable member and at its other end to the flange, and resting in the groove.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
US65186A 1969-08-25 1970-08-19 Brakes Expired - Lifetime US3680665A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4219069 1969-08-25

Publications (1)

Publication Number Publication Date
US3680665A true US3680665A (en) 1972-08-01

Family

ID=10423243

Family Applications (1)

Application Number Title Priority Date Filing Date
US65186A Expired - Lifetime US3680665A (en) 1969-08-25 1970-08-19 Brakes

Country Status (5)

Country Link
US (1) US3680665A (fr)
JP (1) JPS50230B1 (fr)
DE (1) DE2042157A1 (fr)
FR (1) FR2059022A5 (fr)
GB (1) GB1315816A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019040295A1 (fr) * 2017-08-21 2019-02-28 Valmont Industries, Inc. Système et procédé permettant d'assurer le freinage d'un arbre d'entraînement pour des machines d'irrigation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1170216A (en) * 1914-08-13 1916-02-01 Charles C Blanch Brake mechanism.
US2310787A (en) * 1939-05-27 1943-02-09 Electrical Eng Equipment Co Friction brake mechanism for motor driven electric switches and the like
US2379071A (en) * 1941-11-27 1945-06-26 Westinghouse Electric Corp Manual tilt table

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1170216A (en) * 1914-08-13 1916-02-01 Charles C Blanch Brake mechanism.
US2310787A (en) * 1939-05-27 1943-02-09 Electrical Eng Equipment Co Friction brake mechanism for motor driven electric switches and the like
US2379071A (en) * 1941-11-27 1945-06-26 Westinghouse Electric Corp Manual tilt table

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019040295A1 (fr) * 2017-08-21 2019-02-28 Valmont Industries, Inc. Système et procédé permettant d'assurer le freinage d'un arbre d'entraînement pour des machines d'irrigation
US10704626B2 (en) 2017-08-21 2020-07-07 Valmont Industries, Inc. System and method for providing drive shaft braking for irrigation machines
EP3885599A1 (fr) * 2017-08-21 2021-09-29 Valmont Industries, Inc. Système et procédé permettant d'assurer le freinage d'un arbre d'entraînement pour des machines d'irrigation

Also Published As

Publication number Publication date
GB1315816A (en) 1973-05-02
JPS50230B1 (fr) 1975-01-07
DE2042157A1 (de) 1971-03-25
FR2059022A5 (fr) 1971-05-28

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