US1924740A - Stripper - Google Patents

Description

Aug. 29, 1933. R. J. HARRY El AL STRIPPER Filed 001;. 21, 1930 2 Sheets-Sheet INVENTORS Aug. 29, 1933.

R. J. HARRY ET AL STRIPPER Filed Oct. 21, 1930 2 Sheets-Sheet 2 Patented. Aug. 29, 1933 Robert 3. Harry and Milo Shutt, Alliance, 6

to The Alliance Machine Company, Alliance, Ohio, a corporation of Ulric Application Qctober 2i,

Claims.

The present invention relates broadly to strip ping mechanism, and more particularly, to an improved form of stripping crane and is herein described as applied to the stripping of moulds from ingots.

Owing to the fact that both the ingot and the mould to be stripped therefrom are tapered, th large forces necessary to break the mould loose from the ingot need be exerted over but a very short distance, a movement l e mould relatively to the ingot for merely a few inches provides suihcient clearance betwee" the two. After a clearance has been provided between the mould and the ingot, it is desirable to cut down the amount of force exerted by the stripping mechanism and to speed up the movement of the mould relatively to the ingot.

By our invention, we provide means for obtaining the force necessary to produce a small clearance between the sides of the mold and the ingot at a slow speed and for increasing the specs of the stripping mechanism after said clearance has been obtained. This greatly increases the rate of strippin In the accompanying drawings, we have shown for purposes of illustration only, a preferred embodiment of our invention.

In the drawings,

Figure 1 is a side elevation of a crane einbodying our invention; and

Figure 2 is an end elevation of the structure shown in Figure 1.

In the drawings, there is shown a main frame or trolley 2 having wheels 3 thereon adapted to cooperate with rails 31 on the usual movable crane bridge. Guide columns 4 are attached to and extend downwardly from the main frame and are for the purpose of guiding the sheave blocks hereinafter described.

An upper sheave block 5 is suspended from the main frame or trolley 2 by means of tension bolts 6. The block is slidable on the bolts 6, the bolts extending through holes and the heads 9 of the bolts limiting such sliding. Each tension bolt has a threaded portion '7 on the upper end adapted to receive a nut 8. This permits a vertical adjustme nt of the tension bolts with the resultant adjustment of the position which the sheave block 5 occupies when resting on the heads 9 of the bolts 6.

A lower sheave block 11 is provided and is adapted for movement vertically along the guide columns 4 of the frame. This lower sheave block has tongs 12 pivctally attached thereto at 13 which are adapted to engage the lugs 1 of the Serial No. 490,221

mold 15 which is to be stripped from the ingot 16. 17, having screw portion 18 threaded an opening 19 in th main frame or trolley downwardly through the sheave blocks and engages the upper portion of the t 16 to be stripped, holding the ingot down e .heave block 1?. is raised and the mold from the ingot. The upper end of the n is threaded in order it may be adjusted erticaliy so as to be capable of use with ingots of various sizes.

A motor (not shown) is provided the drum 20 through gears 21 and 22. 20 is carried on an axle 23 mounted 24 carried by the trolley 2.

One end of the cable 25 is dead-ended on one side of the drum 20 and reeved over sheaves 26 mounted on the lower sheave block 11, and over sheaves 27 mounted in the upper sheave block 5. The cable 25 then passes over an equalizing sheave 28 carried by the trolley 2. After passing over the equalizing heave 28, the cable 25 passes downwardly and is reeved over sheaves 26a and 27a mounted on sheave blocks 11 and 5, respectively, on the in Figure 2. The cable then passes upwardly around the drum 20 and the other end deadended thereon.

When an ingot is to be stripped, the position of the sheaves at the beginning of the stripping strokewill be as shown in solid lines in thedrawings. When the driving mechanism is actuated, the cable is wound on the drum 20. The sheaves 2"] and 27a remain in the lowermost position as determined by the bolts 6. The sheaves 26 and 260: are raised, carrying with them the block 11 and lifting the ingot mold. The ingot is engaged by the ram 1'7 and a powerful stripping action is exerted on the mold and the ingot.

At the end of the stripping stroke, the length of which can be adjusted by means of the tension bolts 6, the faces 29 and 30 of the blocks 11 and 5, respectively, come in contact with each other. As the drum 20 continues to revolve, the blocks 11 and 5 are raised together during the lifting stroke, during which stroke the mold is lifted clear of the ingot 16. At the end of the lifting stroke, the upper block 5 is in the position shown in dotted lines in the drawings and the lower block is immediately below The sheave block 11, of course, will be designed to clear the bolts 6 pass between corresponding bolts on opposite sides of the frame 2.

During the stripping stroke, the maximum forces are exerted on the mold, At the end of for driving The drum in bearings other side of the ram 17, as shown the stripping stroke when the faces of the upper and lower sheaves come into contact with each other, the effective ratio of the reeving is immediately changed. If the ratio of the reeving during the stripping stroke is 16 to 1, the ratio of the reeving during the lifting stroke, in the construction shown, will be 4 to 1; thus the ratio of the lifting speed to the stripping speed, in the construction shown, is 4 to 1. As may be readily seen, where the ratio of the stripping speed to the lifting speed is l to s, the ratio of the force exerted on the mold during the stripping stroke to that exerted during the lifting stroke is 4 to 1.

The advantages which are obtained during the raising of the sheaves and the stripping of the mold from the ingot are also present when it is desired to lower the mold and place it on a buggy. During the first part of the lowering movement, the sheaves move at a rapid rate of speed. As soon, however, as the upper sheave comes in contact with the bolt heads 9 and the upper and lower sheaves part, the speed of the lower sheave carrying the mold is very materially reduced. This feature is important and of great advantage inasmuch as it prevents the mold from being dropped at such a rate of speed as will result in the breaking of the buggy upon which it is placed.

While we have shown and described a preferred emb diment of our invention, it is to be understood that we are not to be limited thereby and that the invention may be practiced within the scope of the following claims:

We claim:

1. An ingot stripper, comprising a supporting frame, upper and lower lifting blocks, a rain for engaging the ingot, means on the lower block for engaging the ingot mold, means for limiting the downward movement of the upper block, stop means for limiting the upward movement of the lower block. relative to the upper block, power multiplying means connected with said blocks, and power means connected with the power multiplying means to first raise the lower block at a low speed and high power until the upward movement of the lower block is arrested by the stop means to strip the ingot, after which the two blocks with the ingot mold will be raised at high speed without increasing the speed of the power means.

2. An ingot stripper, comprising a supporting frame, upper and lower lifting blocks, guides for said blocks on which the blocks may be moved relative to each other, an adjustable ram for engaging the ingot, means on the lower block for engaging the ingot mold, an adjustable stop for limiting the downward movement of the upper block, stop means for limiting the upward movement of the lower block relative to the upper block, power multiplying means connected with said blocks, and power means connected with the power multiplying means to first raise the lower block at a low speed and high power until the upward movement of the lower block is arrested by the stop means to strip the ingot, after which the two blocks with the ingot mold will be raised at high speed without increasing the speed of the power means.

3. An ingot stripper, comprising a supporting frame, upper and lower lifting blocks, guides for said blocks on which the blocks may be moved relative to each other, a ram on the frame for engaging the ingot, means on the lower block for engaging the ingot mold, a stop for limiting the downward movement of the upper block, stop means for limiting the upward movement of the lower block relative to the upper block, power multiplying means connected with said blocks including sheaves and a connecting cable, and power means connected with the power multiplying means to first raise the lower block at a low speed and high power until the upward movement of the lower block is arrested by the stop means to strip the ingot, after which the two blocks with the ingot mold will be raised at high speed without increasing the speed of the power means.

4. An ingot stripper, comprising a supporting frame, upper and lower lifting blocks, guides for said blocks on which the blocks may be moved relative to each other, a ram on the frame for engaging the ingot, means on the lower block for engaging the ingot mold, a stop for limiting the downward movement of the upper block, stop means for limiting the upward movement of the lower block relative to the upper block, a plurality of sheaves on each block, a cable passing around said sheaves, winding means for said cable to move the blocks relative to each other during a portion of the winding and to cause the blocks to move as a unit during other portion of the move ment of the blocks.

5. An ingot stripper, comprising a supporting frame, upper and lower lifting blocks, guides for said blocks on which the blocks may be moved relative to each other, a ram on the frame for engaging the ingot, means on the lower block for engaging the ingot mold, a stop for limiting the downward movement of the upper block, stop means for limiting the upward movement of the lower block relative to the upper block, a plurality of sheaves on each block, and a winding drum on the frame, and a cable extending from the winding drum about the sheaves on both blocks.

ROBERT J. HARRY. MILO SHUTT.

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