US499702A - Tongs - Google Patents

Description

2 Sheets-Sheet 1. P. T. BERG..

(No Model.)

TONGS.

Patented June 20, 1893.

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(No Model.) 2 Sheets-vSheet 2.

P. T. BERG. TONGS.

No. 499,702. Patented June 20, 1893.

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UNHTED STATES PER TORSTEN BERG, on MUNHALL, PENNSYLVANIA.

TONGS.

SPECIFICATION forming part of Letters Patent No. 499,702, dated June 20, 1893.

Application filed January 23, 1893. Serial No. 459,1L15. (No model.)

To aZZ whom it mayconcern:

Be it known that I, PER TORSTEN BERG, of Munhall, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Tongs, of which the following is a full, clear, and exact description, reference being bad to the accompanying drawings, forming part of this specification, in which Figure 1 shows in side elevation a crane provided with my improved tongs in the act of gripping an ingot in a heating-furnace pit. Fig. 2 is a similar view, showing the tongs in the act of releasing an ingot which has been deposited upon a car. Fig. 3 is an elevation of the tongs. Fig. 4 is a plan view; and Fig. 5 an end elevation thereof.

Like symbols of reference indicate like parts in each.

The object of my invention is to provide means by which powerfully acting tongs can be so constructed as to be adapted to enter conveniently an upright heating-furnace, without occupying much room in so doing, and to lower the tongs into the pit or furnace a much longer distance than ordinarily.

Tongs heretofore used for handling ingots in such furnaces occupy an inconvenient amount of space and this fact has seriously impaired their usefulness as ingot-handling appliances. My improved tongs are so constructed that the tongs when open take up but little room and have longitudinally extending jaws adapted to enter the heatingchamber to grasp the ingot, and having toggle levers at their upper ends which afford means for closing the jaws, and which by reason of their location need not enter the furnace, and therefore need not cause the tongs to take up an inconvenient amount of space.

In the drawings, 2, 3, represent the tongjaws consisting of bars of metal whose general direction is parallel to each other, and which are pivoted at points4 to cross-bars orrigid frame 5.

6, 7, are toggle-levers, preferably of L-form, which are connected pivotally together at 8, and are separately pivoted atpoints 9, 10, to the ends of thejaws 2, 3.

11, 11, are the usual bits fixed to thejaws 2, 3, for the purpose of biting upon an interposed metal piece. The ends of the levers 6,

7, and their intermediate connecting pivot are provided with independent actuating devices or supports, consisting preferably ofchains 13 connected to the ends of thelevers 6,7, and suspended fromthejib 14 of a crane and achain 15 extending from the middle pivot 8 to the ram or piston 16 of a liftingcylinder, also preferably arranged on the jib of the crane. By referring to Figs. 1 and 2, it will be apparent that if thechain 15 is slackened by projecting the ram 16, it will cause the weight of the tongs to be supported by thechains 13, which acting on thelevers 6, 7, will cause divergence of thepivotal points 9, 10, and a consequent approach of theprojections 11, causing them to bite upon an interposedingot 17, as shown in Fig. 1. In actin g in this manner the toggle-levers are prevented from being moved by accident, so far as to bring the central pivot 8 below the line connecting thepivotal points 9, 10, by means ofsafety stops 18, formed on the ends of thelovers 6, 7. By reason of the substantial parallelism of thejaws 2, 3, and the location of the toggles at their upper ends, the tongs will enter the furnace 19 easily and without taking up so much room as to oblige the ingots to be separated unduly from each other in their position on the furnace-hearth, for the toggle-levers 6, 7, which diverge so as to give the tongs great power in acting upon the ingot, need not enter the furnace at least more than to a slight extent. When the ingot has been grasped as above described, it can be lifted from the furnace by raising the jib of the crane, andby swinging the jib laterally in the usual manner can be deposited upon acar 20 or other place to which it is desired to carry it. When it is desired to release the ingot and to leave it upon such car, the crane jib may be lowered and the ram 16 lifted, thus transferring the Weight of the tongs from thechains 13 to thecentral chain 15 and sufiering thelevers 6, 7, to move by gravity into the position shown in Fig. 2, thereby opening the jaws, releasing the ingot, and permitting the tongs to be moved away therefrom in the operation of the crane.

The advantages of my invention will be appreciated by those skilled in the art. The

tongs are simple and very effective in their action, and by reason of their construction they permit a large number of ingots to be grouped together in a heating furnace without leaving much intermediate space for the entrance and operation of the tongs, while, on account of their deep lowering capacity, they can manipulate much shorter ingots than was heretofore possible.

WVithout limiting myself with strictness to the described construction of the parts, which, within the scope of the claims may be varied by the skilled mechanic, I claim- 1. Tongs having gripping jaws, toggle-levers pivoted to the upper ends of the jaws, and projecting outwardly, means for suspending said levers at their outer ends, and independent means for suspending the tongs at the connection of the toggle-levers; substantially as described.

2. Tongs having substantially parallel gripping jaws, a rigid frame to which they are pivoted at their middle points on separate pivots and on which they are movable radially, to gle-levers pivoted to the upper ends of the jaws, and means for suspending the tongs from said levers; substantially as described.

3. Tongs having substantially parallel gripping jaws, pivoted on separate pivots at their middle points and movable radially on said pivots, toggle-levers pivoted to the upper ends of the jaws, means for suspending the tongs from said levers, and independent means for suspending the tongs at the place of connection of the toggle-levers; substantially as described.

4. Tongs having substantially parallel gripping jaws, a rigid frame to which they are pivoted at middle points on separate pivots and on which they are movable radially, togglelevers pivoted to the upper ends of the jaws, means for suspending the tongs from said levers, and independent means for suspending the tongs at the place of connection of the toggle-levers; substantially as described.

In testimony whereof I have hereunto set my hand.

PER TORSTEN BERG.

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