US146675A - Improvement in door-pulleys - Google Patents

Improvement in door-pulleys Download PDF

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US146675A
US146675A US146675DA US146675A US 146675 A US146675 A US 146675A US 146675D A US146675D A US 146675DA US 146675 A US146675 A US 146675A
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door
pulley
improvement
pulleys
cord
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    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F1/00—Closers or openers for wings, not otherwise provided for in this subclass
    • E05F1/02—Closers or openers for wings, not otherwise provided for in this subclass gravity-actuated, e.g. by use of counterweights

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  • This invention has relation to means for automatically closing doors; and it consists 1n the construction and novel arrangement of the parts constituting ⁇ a tripartite door-pulley having the worm or screw-groove formed at its ends on cylinders of varying lengths and small diameters, and between said end cylinders on an intermediate enlargement or cylinder of greater diameter, said groove being continuous from one end to the other of the pulley, and being designed for the passage ot' the weightcord, which is attached by one end to the door, as hereinafter more fully described.
  • rIhe object of this invention is to provide means whereby a door, in the first place, may be automatically closed, and, in the second place, held closed with considerable force. Finally, it is designed to enable the door to be opened widely without much exertion and to be readily held open.
  • the letter A designates the pulley
  • B the bracket in ,which it-iis' hung, and by means of which it is attached to the wall of a recess in the doorj amb or other suitable place.
  • the intermediate or enlarged portion of the pulley lettered a on the drawings is usually nearer one end than 0f these ends
  • b designates the c designates the the other. shorter, and b' the longer.
  • cord attached by one end to the door, wound several times about the pulley, and provided at its other end with a pendent weight, w.
  • This cord maybe secured to the enlarged portion of the pulley at about the point marked d on the drawings'.
  • e designates the cordgroove, which is helical and continuous from one end of the pulley to the other, passing from the more contracted ends to and from the enlargement a by means of spiral or scroll-like steps, a.
  • the cord is designed to be attached to the pulley in such a manner that when the dooi ⁇ is closed that branch of the cord which is attached to the door will be wound upon the small cylinder b, passing thence .by the step a to the enlargement a, from which the weight hangs. In this position the difference in leverage between the enlargement c and the end cylinder b causes the door to be held closed with considerable force.
  • the doorbranch of the cord When the door is opened, the doorbranch of the cord will be run upon the enlargement a, and the weight-branch thereof will be run out upon the long end cylinder b., from which the weight will hang. In this position while the weight has sufficient force to automatically close the door, if not held open, the diiierence in leverage between the enlargement a and cylinder b lessens this force, so that the door may be readily moved.
  • the triple doorpulley hung in the bracket B in the door-frame, and having the end cylinders b b', the intermediate enlargement a, the spiral steps a', and the helical cord-groove c, continuous fromend to end of the pulley, in connection with the cord c attached to the door and weight w, as and for the purpose specified.

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  • Power-Operated Mechanisms For Wings (AREA)

Description

UNITED STATES PATENT CEEIoE.
IVILLIAM A. HOLVELL, OF QUEBEC, CANADA.
IMPROVEMENT IN DOOR-PULLEVS.
Specification forming part of Letters Patent No. 146,675, dated January 20, 1874; application filed August 4, 1873.
` view of the same.
This invention has relation to means for automatically closing doors; and it consists 1n the construction and novel arrangement of the parts constituting` a tripartite door-pulley having the worm or screw-groove formed at its ends on cylinders of varying lengths and small diameters, and between said end cylinders on an intermediate enlargement or cylinder of greater diameter, said groove being continuous from one end to the other of the pulley, and being designed for the passage ot' the weightcord, which is attached by one end to the door, as hereinafter more fully described. rIhe object of this invention is to provide means whereby a door, in the first place, may be automatically closed, and, in the second place, held closed with considerable force. Finally, it is designed to enable the door to be opened widely without much exertion and to be readily held open.
In the accompanying drawings, the letter A designates the pulley, and B the bracket in ,which it-iis' hung, and by means of which it is attached to the wall of a recess in the doorj amb or other suitable place. The intermediate or enlarged portion of the pulley lettered a on the drawings is usually nearer one end than 0f these ends b designates the c designates the the other. shorter, and b' the longer.
cord attached by one end to the door, wound several times about the pulley, and provided at its other end with a pendent weight, w. This cord maybe secured to the enlarged portion of the pulley at about the point marked d on the drawings'. e designates the cordgroove, which is helical and continuous from one end of the pulley to the other, passing from the more contracted ends to and from the enlargement a by means of spiral or scroll-like steps, a.
The cord is designed to be attached to the pulley in such a manner that when the dooi` is closed that branch of the cord which is attached to the door will be wound upon the small cylinder b, passing thence .by the step a to the enlargement a, from which the weight hangs. In this position the difference in leverage between the enlargement c and the end cylinder b causes the door to be held closed with considerable force.
When the door is opened, the doorbranch of the cord will be run upon the enlargement a, and the weight-branch thereof will be run out upon the long end cylinder b., from which the weight will hang. In this position while the weight has sufficient force to automatically close the door, if not held open, the diiierence in leverage between the enlargement a and cylinder b lessens this force, so that the door may be readily moved.
I am aware that differential pulleys resembling mine have been used in spinningmaehines and hay-presses. I do not, therefore, claim such a pulley broadly; but
What I claim as my invention, and desire to secure by Letters Patent, is-
The triple doorpulley hung in the bracket B in the door-frame, and having the end cylinders b b', the intermediate enlargement a, the spiral steps a', and the helical cord-groove c, continuous fromend to end of the pulley, in connection with the cord c attached to the door and weight w, as and for the purpose specified.
Quebec, 31st July, 1873.
1V. ANTROBUS HOLIVELL.
IVitnesses:
W. DARLING CAMPBELL,
of Quebec, Notary Public. JAs. ALLPU, of Quebec, Notary Public.V
US146675D Improvement in door-pulleys Expired - Lifetime US146675A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678188A (en) * 1950-10-24 1954-05-11 Rogers Brothers Corp Return and counterbalance device for detachable gooseneck trailers
US4062640A (en) * 1976-09-24 1977-12-13 Bethlehem Steel Corporation Method and means for controlling long stroke pumping units
US5890674A (en) * 1998-01-16 1999-04-06 Formall, Inc. Involute reel guide
US20110266098A1 (en) * 2003-01-21 2011-11-03 Four Marshall Management, L.L.C. Elevator Hoistway Door Closer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678188A (en) * 1950-10-24 1954-05-11 Rogers Brothers Corp Return and counterbalance device for detachable gooseneck trailers
US4062640A (en) * 1976-09-24 1977-12-13 Bethlehem Steel Corporation Method and means for controlling long stroke pumping units
US5890674A (en) * 1998-01-16 1999-04-06 Formall, Inc. Involute reel guide
WO1999036339A1 (en) * 1998-01-16 1999-07-22 Formall, Inc. Involute reel guide
US20110266098A1 (en) * 2003-01-21 2011-11-03 Four Marshall Management, L.L.C. Elevator Hoistway Door Closer
US8353079B2 (en) * 2003-01-21 2013-01-15 Chris Marshall Elevator hoistway door closer

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