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Publication numberUS958978 A
Publication typeGrant
Publication dateMay 24, 1910
Filing dateMar 10, 1909
Priority dateMar 10, 1909
Publication numberUS 958978 A, US 958978A, US-A-958978, US958978 A, US958978A
InventorsMajor V Spencer
Original AssigneeMajor V Spencer
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Trip grab-hook.
US 958978 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)


Patented May 24, 1910.



Specification of Letters Patent.

Application filed March 10, 1909.

Patented May 24:, 1910.

Serial No. 482,541.

To all whom it may concem:

Be it known that I, MAJOR V. SPENCER, a citizen of the United States, residing at Deer River, in the county of Itasca and State of Minnesota, have invented certain naw and useful Improvements in Trip Grab-Hooks, of which the following is a specification.

This invention relates to improvements in trip grab hooks, and is especially adapted for a quick and eflicient release of a load from a hook of this character; the construction of the hook being such, that there is no apparent leverage or strain upon the tripping mechanism. The mouth of the hook is especially constructed to allow the weight of a load to dwell upon a supporting link which is almost over the center of gravity of the mouth of said hook.

Another feature of this invention is the right angled slot near the top of the neck of said hook, which is adapted to support a {ripping link for retaining the tripping ever.

This invention further relates to a link for supporting the hook, and the tripping lever.

With the foregoing and other objects in view, the invention consists in the details of construction and in the arrangement and combination of the parts to be hereinafter more fully set forth and claimed.

In describing this invention in detail, reference will be had to the accompanying drawings forming part of this specification, wherein like characters denote corresponding parts in the several views, in which:

Figure 1, illustrates in a perspective view the improved tripping hook. Fig. 2, illustrates the device after being tripped. Fig. 3, illustrates in elevation the link detached from the hook. Fig. 4, illustrates the hook in side elevation removed from the link. Fig. 5, illustrates the tripping lever in elevation. Fig. 6, illustrates a modified form of tripping lever. Fig. 7, illustrates a modified link with open ends.

This invention consists of a link A, having projections A, thereon, which are provided with bearings A The extreme ends of said link are as indicated at A Se-- cured in the bearings A is a trip lever B, through the medium of trunnions B Centrally located in said tripping lever is a mortise B for the reception of a rounded extension C Integral with said tripping lever B, is a tongue B, which is adapted to engage the free ends of a link G, to be hereinafter more fully set forth. Attached to said link A, at the bottom thereof is a hook O, by means of an aperture C in said hook. Said hook is provided with a deep mouth C, with opposing parallel sides. The neck C of said hook, is provided with a right angled slot, having vertical and horizontal portions D, and D, respectively. Secured in said right-angled slot is a link Gr, previously referred to. Said neck C terminates in a rounded extension C and adjacent thereto is a shoulder C, for supporting the aforesaid tripping link B. Attached to the top of said link A, is a rope or chain F, for hoisting said device for the object in view.

hen operating my improved device the hook is supposed at first to be disengaged as indicated in Fig. 2; when the hook C, is raised with the neck C uppermost, the tripping link B, is then swung over the rounded extension C and resting on the shoulder C, when the link G, is raised and slid upward into the vertical portion D, of the rightangled slot, after which the free ends of said tripping link G, is pushed over the tongue B, of the tripping lever. As the operator releases his hand from the said tripping link G, the lower end thereof drops down the vertical slot D, into the horizontal slot D, thus preventing said link from becoming disengaged when the load is put in the mouth C, of the hook C. It will be observed that the mouth C, of said hook, is slightly to the right of the aperture C, so as to afiord a slight leverage when the tripping link G, is disengaged, so that the hook will roll around its link connections C in the direction of arrow J. When the hook C, is released it will assume the position indicated in Fig. :2, of the accompanying drawings.

The modified tripping lever illustrated in Fig. 6, will produce the same results as the tripping lever shown in Fig. 5. In place of trunnions B a single bar B is employed, having its sides B, located on the outside of the link A, by this construction said modified lever will prevent said link from spreading from any unusual strain.

In Fig. 7 a modified form of link is indicated, which has open ends A and provided with a bolt A I do not limit this device to the exact construction herein shown and described, as devices of a similar character may be employed and come within the scope of my invention.

That which I desire to secure by Letters Patent, is:

In a trip grab hook, a supporting member having opposite portions, a hook member pivotally connected to the lower ends of the opposite portions, said hook member having an arm provided with a terminal offset and with an angular slot, a trip member pivoted to the supporting member and formed with a slot to receive the offset terminal of the hook arm and with a projecting portion, and a link member pivoted in said angular slot adapted to engage the projecting portion of the trip member whereby the hook member is held in a holding position on the supporting member.

In testimony whereof I aflix my signature in presence of two witnesses.


Referenced by
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US2565172 *Aug 9, 1949Aug 21, 1951Vickers Armstrongs LtdBomb slip and analogous releasable attachment
US2769654 *Jun 22, 1954Nov 6, 1956Humphrey Irl WAutomatically releasing shackle
US4173367 *Feb 28, 1978Nov 6, 1979Ernest HaeusslerPickup unit for lifting concrete body
US4367892 *Oct 23, 1980Jan 11, 1983The Burke CompanyLift system for tilt-up walls
US4930269 *Mar 22, 1989Jun 5, 1990The Burke CompanyApparatus and method for lifting tilt-up wall constructions
US5014473 *Feb 20, 1990May 14, 1991The Burke CompanyApparatus and method for lifting tilt-up wall constructions
US5094047 *Sep 20, 1990Mar 10, 1992The Burke CompanyApparatus and method for lifting tilt-up wall constructions
US5226265 *Dec 23, 1991Jul 13, 1993The Burke CompanyApparatus and method for lifting tilt-up wall constructions
US5253909 *May 15, 1992Oct 19, 1993Harumi OshitaCombination of a chain and a chain hook
US5704668 *Mar 31, 1994Jan 6, 1998Ferrato; GerardRemote and fast-acting fastening and release device
US7032354Dec 19, 2002Apr 25, 2006Universal Form Clamp Co., Inc.Sandwich erection lift anchor with welding plate assembly
US7065925Feb 11, 2004Jun 27, 2006Universal Form Clamp Of Chicago, Inc.Concrete anchor
US7111432Feb 11, 2004Sep 26, 2006Universal Form Clamp Of Chicago, Inc.Passthrough concrete anchor
US20040159070 *Feb 11, 2004Aug 19, 2004Universal Form Clamp Co., Inc.Passthrough concrete anchor
Cooperative ClassificationB66C1/34