US1279274A - Grab-hook for lifting metal plates, &c. - Google Patents

Description

A. COMRIE. GRAB HOOK FOR LIFTING METAL PLATES, 64c.

APPLICATION FILED IAN. 2I| IQIH.

Patented Sept. 17, 1918.

I I mvgmron er 7 W ha rcare.

ALEXANDER CGMRIE', GE NEW YORK, N. Y.

GRAB-HOOK FOB LIFTG MET PLATES, w.

' .To all whom z't may concern:

' fication,

ricks Be it known that I, ALEXANDER COMRm,.a citizen of the United States, and a resident of the borough of Richmond of the city of New York, in the State of New York, have invented certain new and useful Tm rovements in Grab-Hooks for Lifting etal Plates, &c., of which the following is a specireference being had to the accompanying drawing forming a part hereof.

The object of this invention is to provide a grab-hook or clamp by which the handling of heavy plates of metal by cranes or dercan be facilitated. t is not always feasibleor desirable to form such plates with holes for engagement with a hook and to encircle them with chains is oftentimes dif ficult, generally dangerous because of the liability of the chains to slip, and alwa s involving expense in e of unnecessary weig t. The invention consists in a grab-hook or lifting clamp which maybe connected readily to a lifting chain or cable or rope and will grasp firmly the plate or plates to be lifted without danger of slipping. In accordance with the invention a rigid jaw-piece has pivoted thereon an eccentric gripper to which the lifting chain or cable or rope is connected in such a way that the strain on the chain, cable or rope in lifting causes the gripper to grip the plate or'plates firmly against the closing jaw.

he invention will be more fully explained hereinafter with reference to the accompanying drawing in which it is illustrated, and in which Figure l is a view of the improved grabhook in elevation, the grab-hook being shown as engaged with a plate to be lifted.

Fig. 2 is a similar view of the grab-hook but with the grab-hook open, in readiness toengage a plate.

Fig. 3 is a detail view in section on the plane indicated by the line 33 of Fig. 1, looking in the direction of the arrows.

The improved grab-hook comprises a jaw piece a and a pivoted gripper b. The jawpiece is so formed as to provide an unyielding abutment a against which the plate to be lifted may be gripped. It is also formed, at one side of the plane of the abutment a, as with an eye a, for engagement with an elongated chain link or eye 0. The pivoted ripper 72, having an eccentric serrated body and an arm 5 substantially at right Specification of Letters Patent. Application filed January'm, 1918. Serial No. 212,921.

uipment and the lifting.

danger of sli ping of the angles with the bodyb, is pivoted opposite the abutment a. For convenience, the jawpiece a may have its extended arm a, opposite the abutment a, split, as clearly shown in Fig. 3, with the grip er pivoted between the members of, the for on a pivot bolt d. The lifting chain c, or so much thereof as is permanently attached to the grab-hook, is passed through the eye or link 0 and is connected to the end of the arm I) of the gripper so that when a strain is put upon the lifting chain c the gripper will be drawn from the position shown in Fig. 2, which permits a plate or plates to be introduced etween the abutment c and the gripper, to

Sept i E -go the position shown in Fig. 1, in which the gripper is made to press firmly against the plate f to be lifted and to cause it to be gripped between the opposing abutment a and itself. The greater the weight ofthe plate or plates to be lifted the more strongly will the gripper be made to grip the plate or plates, so that there is practically no from the gra hook. it is easily possible, with this grab-hook, to lift several plates at one time, as well as one, and as soon as the plate or plates loadis lowered to its resting place it can be released readily from the grab-hook by slackening the chain and, if necessary, striking the end of the arm 6 of th a hammer or other suitable instrument. The flexible lifting chain is. passed through the eye a, which is pivoted at the up or endot the jawpiece a and at one side of t e plane of the abutment at. e chain is then connec to the arm of the gripper at the other do at the plane of the a utment. roh the emploent of these means the gates is caused to grip the plate t on y e oi? the direction of pull of the chain with respect to the position of the plam, the danr oi disengaging the clamp if the plate lands heavily on l is obviated, and the device can be used without risk of injury to the hands of the workman who applies it to a plate. Moreover, there are no rigid links to be bent by a has side pull.

1 claim as my invention:

A grab hook for lifting metal plates, etc, comprising a jaw piece having an abutment against which the plate to be lifted may he pressed and an arm opposite the abutment, and having aneye at one side of the plane of the abutment extending through an e gripper with ing in the aw piece and freely movable therein and adapted to permit a chain to pea freely through it, oted in the arm of 5 abutment having at substantially a at the other side 0 an eccentric gripper pm?- the jaw piece opposite the an arm extending outwar right angle from its bod-y f the plane of the abutment d 'This specification signed this 14th day of January, A. D. 1

918. v ALEXANDER COMRIE.

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