US2560500A - Safety device for hoist platforms - Google Patents

Safety device for hoist platforms Download PDF

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Publication number
US2560500A
US2560500A US105118A US10511849A US2560500A US 2560500 A US2560500 A US 2560500A US 105118 A US105118 A US 105118A US 10511849 A US10511849 A US 10511849A US 2560500 A US2560500 A US 2560500A
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US
United States
Prior art keywords
platform
bar
cable
hoist
guideways
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
US105118A
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English (en)
Inventor
Warry Reginald Frank
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.)
R F WARRY Ltd
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R F WARRY Ltd
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Filing date
Publication date
Application filed by R F WARRY Ltd filed Critical R F WARRY Ltd
Application granted granted Critical
Publication of US2560500A publication Critical patent/US2560500A/en
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/16—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
    • B66B5/18—Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well and applying frictional retarding forces

Definitions

  • This invention relates to safety devices for use Awith hoist platforms, lift cages and the like.
  • cam actuated devices have been proposed hereto- 'fore adapted consequent upon the freeing of the tension of the cable from spring means associated with the platform or cage to seize or bite against the hoist frame or guideways in the lift shaft.
  • These and other known previously proposed safety devices are generally of a somewhat complicated or expensive nature and frequently fail by reason of their becoming worn away and/or slipping relatively to the frame or guide.
  • the object of the present invention is to provide a highly positive, simple and very strong safety device suitable for use with hoists or lift cages in which the platform or cage travels along a vertical or nearly vertical frame.
  • the present invention is particularly useful in connection with the form of hoist described in my application No. 18,270 of 1946 in which the platform of a transportable hoist carries rollers by which it is guided along the appropriate anglebar members of a girder type of hoist frame.
  • the present invention is broadly characterised in that the cable by which the hoist platform or lift cage, hereinafter referred to as the platform, is drawn upwards along guideways is operatively connected to the platform via an abutment member which, by the tension of the said cable is held against a locking member formed with abutments adapted, when the cable breaks or comes adrift, to bite against adjacent vertical guideways but normally held clear of said guideways, said locking member being held by the tension of the cable in the normal or inoperative position by engaging a stop on the platform, spring means yieldingly opposing the tension of the cable being provided across the locking member and the platform, and across the abutment member and the platform, and adapted upon the cable shearing or coming adrift to separate the abutment member and the locking memberV and to move the 2 locking member to engage its abutments with the guideways whereby the said stop will, under the iniiuence of the weight of the platform cause the abutments on the locking member to bite against the guideways to arrest the platforms descent.
  • Figure 1 is a front broken elevation view showing the platform adapted to a hoist similar to that described in co-pending application No. 18,276 of 1946 and with the platform supported by the cable under normal conditions.
  • Y is a front broken elevation view showing the platform adapted to a hoist similar to that described in co-pending application No. 18,276 of 1946 and with the platform supported by the cable under normal conditions.
  • Figure 2 shows the relative positions of the platform and elements of the safety device immediately the cable breaks or comes adrift.
  • Figure 3 shows the safety device operative.
  • Figure 4 is a side elevation view of Figure l
  • Figure 5 is a broken perspective rear view showing the relative disposition of the parts immediately the cable breaks or comes adrift.
  • the platform frame I has two angle bar rear uprights 2 and 3, diagonal struts 4 across the tops of the uprights and the platform frame I, angle cross bars 5, 6 and 'I welded to the uprights, and rollers 8 tracking the front angle bar members 9 and I il, of the main column of the hoist along which the platform is raised and lowered by suitable winding mechanism receiving a cable II guided over a pulley I2 and anchored at one end to the top of the column and at the other end to a winch drum in Well known manner the pulley I2 is supported within?
  • Two vertical coiled tension springs I6 and I'Iv are anchored at their lower ends to the platform I, e. g. to hooks I8 on the lower ends of the plat;
  • the gripper bar I9 is provided with two abutments 2l and 22 adapted to engage the said angle-section front bars 9 and I0 of the hoist column when the cable breaks or comes adrift, and. the abutment 22 on the gripper bar I9 at theend adjacent the end of the transverse bar I5 to which the coiled tension spring II is anghored is of wedge or Acube form with one edge ngr-mally slightly spaced from the adjacent hoist frame member I0.
  • the other abutmentf2I i. e. the abutment on the end of the bar I9 to which tliekother coiled tension spring I6 is anchored preferablyV has a polygonal, e. g.
  • the median part of the gripper bar I9 is formed with a V-shaped notch 23, or with a proud inverted V-shaped projection normally resting over a fulcrum pin 24 xed to the centre of the cross bar 5 of the platform frame.
  • a karist column incorporating guides, a platform, a cable from which the platform is suspended and by which it is pulled up and lowered down the guides, a locking bar carried by and displaceable relative to the platform and spanning the said guides, relatively fixed abutments on said bar disposed adjacent to but normally not positively engaging the guides so that the locking bar is normally inoperative, means on the platform to actuate the locking bar to the operative position and normally subjected to the tension of the cable and thereby maintaining said locking bar in the said inoperative positional relationship with the platform and guides but adapted upon the cable shearing or coming adrift to cause a tilting of said locking bar to bring ksaid abutments hard against the guides and thereby to lock the platform against further descent.
  • Vsafety means comprising a cable anchorage member carried by the platform and a locking bar spanning the said guideways, abutments on said bar adapted, when the cable breaks or cornes adrift, to bite against the said guideways but normally held lclear of said guideways, a stop for the locking bar on the platform, said anchorage member under the tension vof the said cable being held against the locking bar to hold the locking bar due to the tension of the cable ⁇ in the normal or inoperative position against said stop on the platform with the abutments on the bar notmbiting against the guideways, spring meansyieldingly opposing the tensipn of the cable being yprovided across the locking bar and the platform, and across the anchorage member
  • A, safety device for use with up and down travelling ⁇ platforms of hoists in which the hoist embodies vertical-frame elements forming a column and in which the platform is pulled up and lowered down parallel guideways of the column by a cable adapted to be driven from a power unit, comprising a tiltable locking bar connected, but angularly displaceable relative, to the platform and common to and overlapping vertical frame elements of the column, relatively fixed abutments on said locking bar between which the latter frame elements are located, the abutments normally being disposed close to but clearing said latter frame elements, spring means tending to tilt said locking bar relative to the platform so as to cause the said abutments to bite hard against the said latter frame elements and to seize the bar immovably across such frame elements to arrest descent of the platform, and ⁇ a connection from the cable to said spring means which normally overcomes the aforesaid tendency of the spring means to displace the said locking bar into the operative position.
  • a safety device for hoist platforms in which a cable carried up the hoist from the platform is connected to the power operated means for raising the platform along parallel guides of the hoist, comprising a substantially horizontal abutment bar carried by the platform and disposed across one face of the parallel guides and to which the cable is connected to apply lift to the platform, spring means connected across one end of this abutment bar and the platform, a locking bar fulcrumed between its ends to the platform frame, and located above and engaged by said abutment bar so that normally the abutment barlies flush against the parallel superposed locking bar, further spring means to which the end of this locking bar remote from the spring loaded end of the abutment bar is connected to the platform, both of said spring means combining to yieldingly oppose the cables tension, the platform having a relatively fixed stop normally engagingthe upper edge of the locking bar and between which and the abutment bar the spring loaded end of the locking bar is located, two abutments on the locking bar disposed close to but normally spaced beyond the e-dges of the said
  • a safety device to arrest descent of a hoist platform down guideways of the hoist consequent upon the shearing or coming adrift of a cable of the hoist by which the platform is connected to means for pulling it up and lowering it down the platform comprising a locking bar with two relatively fixed abutments and carried relatively tiltably by the platform and spanning the guideways, spring means receiving the lifting tension of the cable and normally maintaining the locking bar in such position that its abutments are located close to but spaced from the guideways, and adapted consequent upon the tension of the cable being released therefrom to assert itself to tilt the locking bar so as to bite its said abutments against the guideways and arrest-the descent of the platform.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Types And Forms Of Lifts (AREA)
  • Jib Cranes (AREA)
US105118A 1948-01-24 1949-07-16 Safety device for hoist platforms Expired - Lifetime US2560500A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2560500X 1948-01-24

Publications (1)

Publication Number Publication Date
US2560500A true US2560500A (en) 1951-07-10

Family

ID=10910142

Family Applications (1)

Application Number Title Priority Date Filing Date
US105118A Expired - Lifetime US2560500A (en) 1948-01-24 1949-07-16 Safety device for hoist platforms

Country Status (2)

Country Link
US (1) US2560500A (de)
DE (1) DE804461C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070199387A1 (en) * 2006-02-27 2007-08-30 Asher Michael J Test Stand

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US874339A (en) * 1907-02-19 1907-12-17 Peter Hinkel Elevator.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US874339A (en) * 1907-02-19 1907-12-17 Peter Hinkel Elevator.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070199387A1 (en) * 2006-02-27 2007-08-30 Asher Michael J Test Stand
US7591190B2 (en) * 2006-02-27 2009-09-22 American Fabricating, Llc Test stand

Also Published As

Publication number Publication date
DE804461C (de) 1951-04-23

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