US542232A

US542232A - Lifting-dog

Info

Publication number: US542232A
Authority: US
Publication date: 1895-07-09
Anticipated expiration: 1912-07-09

Description

(No Model.)

F. BEATTIE.

LIFTING DOG No. 542,232. Patented July 9, 1395.

UNITED STATES PATENT Fries.

FRANK main,- or LEETE ISLAND, CONNECTICUT.

LlFTlNG-DOG.

SPECIFICATION forming part of Letters Patent No. 542,232, dated July 9, 1895.

,. Application filed February 4, 1895i Serial 110,537,219- (No model.)

To all whom it may concern:

Be it known that I, FRANK BEATTIE, of Leete Island, in the county of New Haven and State of Connecticut, have invented a new Improvement in Lifting-Dogs; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, andwhich said drawings constitute part of this specification, and represent, in

Figure 1, a side View of the apparatus as engaged with a stone; Fig. 2, a side view of the lower portion of the apparatus.

This invention relates to an improvement in lifting-dogs, and is an improvement upon the device shown and described in the application filed by me December 8, 1894, Serial No. 534,203.

In the device above referred to a slotted transverse rod was employed to support the upper ends of the jaws, and such const ruc-' tion is found very advantageous in using the device for raising small stones; but necessarily the length of the rod is limited, and consequently the limit of mov ement of the upper ends of the jaws is limited, so that the device is not conveniently used with wide stones. 7

One object of my present invention isto produce a pair of dogs which maybe applied to stones of any width.

In employing bearing-blocks at the lower ends of the jaws of lifting-dogs it is found in practice that said blocks have a' tendency to rock, as the pressure of the stone is downward, and a second object of this invention is to overcome this diificulty; and the invention consists in the constructions as hereinafter described, and particularly recited in the claims. I

As in the device shown in the application above referred to, this device consists of a pair of tongs, the two legs A A of which are formed of two plates connected at their upper ends by a pivot B. Between the lower ends of the tongs jaws C C are hungupon pivots D E, which pivots also serve to connect the lower ends of the plates forming the legs of the tongs. These jaws curve upward and are formed at their upper ends with eyesF, which stand in a plane at right angles to the plane of the jaws, and at their lower ends with projecting arms G, to which bearingblccks H H are secured, and provided with connections to form a universal joint therewith. Between the plates of the tongs, and

about midway of their length, arms I I are shown,) the chains N N being adapted to be engaged with each other at varions points to adjust the distance between the arms I I.

The connection between the blocks H and the arms G is made near the lower ends of the blocks, so that the extension of the blocks above the arms is considerably greater than the, distance below the arms, and so that the natural tendency of the upper ends of the blocks would be to rock toward each other.

In operation astone is placed between the blocks and the chains N N drawn toward each other and engaged, in which position the upper ends of the arms are thrown out ward, as indicated in broken lines. Liftingstrain then being applied to the chains 0 O, the upper ends of the arms will be drawn toward each other, which places the chains N N under tension and consequently draws theblocks H H into close Contact with the stone to be raised,-and because the connection between the blocks and the jaws is made at the lower ends of the blocks the grip of the blocks upon the stone will be very materially increased. 'In lifting stones of about the same dimensions the adjustment of the chain N N for each 0 oration is not required, and this chain, passing through the eyes of the jaws, holds the upper ends of the jaws and prevents their dropping downward to seriously inconvenience the operators in adjust- 1 ing the apparatus upon a stone. If desired, the pivots D E may so connect the lower ends of the jaws with the tongs as to prevent free swinging movement, so that they will be frictionally supported in any position to which they may be turned.

I claim 1. A lifting apparatus consisting of a pair of tongs, the legs of which are vertically divided, jaws hung in the lower ends of said legs and provided with bearingblocks, the upper ends of said jaws formed with eyes, arms hung in said legs above said jaws, tension chains passing through said eyes and connecting the lower ends of said arms, and

a lifting chain connected with the tension.

chains and in engagement with the upper ends of said arms, and whereby said arms are drawn together in the raising operation, substantially as described.-

.2. The combination in a lifting apparatus comprising a pair of jaws, two swinging arms connected-with said jaws and lifting chains in engagement with said arms for raising them and said jaws, of bearing blocks secured to the lower ends of said jaws by universal joints, which joints are below thetransverse centers of the said blocks, substantially as described.

In testimony whereof I have signed this specification in the presence of two subscrib-