US1004925A - Furnace-cover attachment. - Google Patents

Description

11. 11. STEELE. FURNAGE COVER ATTACHMENT.

APPLICATION FILED JULY 11, 1910.

1,004,925. Patented 0111.3, 1911.

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D. R. STEELE.

FURNACE COVER ATTACHMENT.

APPLICATION FILED JULY 11, 1910.

- 1,004,925, PatentedCct. 3, 1911.

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UNITED STATES PATENT OFFTQE.

DAVID.-

STEELE, OF CURTIS BAY, MARYLAND, ASSTGNOR 0F ONE-HALF TO HARRY D.

HARVEY, OF BALTIMORE, MARYLAND.

FURNACE-COVER ATTACHMENT.

Specification of Letters Patent.

Patented Diet. 3, 1911.

To. all whom it; may concern:

Be it known that I, DAVID R. STEELE, a citizen of the United States, residing at Curtis Bay, in the county of Anne Arundel and State of Maryland, have invented certain new and useful Improvements in Furnace-Cover Attachments, of which the following is a specification.

This invention comprises means for removing and replacing the covers of furnaces for melting metals, whereby the cover, when removed from the furnace, is automatically turned so that its lower side will face away from the top of the furnace, thus permitting the workmen to remove the crucible containing the molten metal without being exposed to the heat radiating from the side of the cover which has been subjected to the intense heat of the furnace.

In the accompanying drawing, Figure 1 is a perspective view, taken from the fuelinlet side, of a furnace with my improvements thereon, the cover being shown in closed position; Fig. 2 is a similar view of the upper portion of the furnace taken from the outlet side, and Fig. 3 is a View similar to that shown in Fig. 1 but showing the cover removed from the furnace top.

Referring to the drawing, A indicates a furnace casing adapted to receive a crucible which may be inserted and removed through the open end a of the casing. The furnace is provided at one side with the necessary fuel feeding device B, and at its opposite side with a suitable duct C for the escape of the burned gases.

Upon brackets 1, arranged at either side of the outlet duct, are secured bearings 2 in which is journaled a rock shaft 3, and upon the ends of the shaft are secured arms 4 and 5, the shaft and arms forming a yoke for raising and lowering the cover D of the furnace. The cover is made of refactory material surrounded by a metal band 6, and it is pivotally connected at its periphery to the free ends of the arms 4, 5, by trunnions 7 which are arranged slightly at one side of a line passing diametrically through the cover so that the cover is unbalanced, the part 03 at one side of the line of the trunnions being somewhat heavier than the part 03 at the opposite side of said line.

A crank arm 8, secured rigidly to one of the trunnions, projects toward the inlet side of the furnace, and, at the opposite side of the axis of the cover, the latter is provided with a laterally projecting tongue or stop 9, which rests upon one of the arms 4 of the yoke when the cover is in position over the open end a of the furnace. The crank arm is connected by a link 10 to a stationary stop 11, secured upon the side of the furnace wall below the pivotal axis of the cover, when the latter is upon the furnace. The link 10 extends through a suitable guideway or opening in the stop 11, and a collar 12, which forms a stop, is secured to the link below the stop 11.

A short lever 13 is secured to the rock shaft 3, and in order to rock the shaft a long lever 14: is provided, the latter having a socket in one end which fits over the short lever 13.

When the cover is upon the furnace, the stop 12 is a short distance below the stop 11 and the stop 9 rests upon the arm 4 of the yoke, as shown in Fig. 1. To remove the cover from the top of the furnace, the lever v1 1 is placed upon the short lever 13 and swung so as to rock the arms 1 and 5 of the yoke from the position shown in Figs. 1 and 2 to the position shown in Fig. 3. During the first part of this movement the cover is lifted without turning on its trunnions, the heavier part of the cover being supported by the projection 9 resting upon the arm 4. After the lid has been thus lifted away from the furnace wall, the continued rotation of the yoke causes the stop 12 on the link or stay 10 to engage the stop 11 and then, as the arms 1 and 5 swing to their final position, the crank 8, connected to the link 10, causes the cover to turn approximately one hundred and eighty degrees about its own pivotal axis, reversing its position relatively to the yoke, so that the lower side of the cover will face away from a vertical line passing through the mouth of the furnace. The arms of the yoke swing slightly past the vertical position and the stay 10 prevents further movement and holds the parts in the position shown in Fig. 3. The workmen may then inspect or remove or replace the contents of the furnace without being aflected by the heat radiating from the lower face of the cover.

To return the cover to its position over the open end of the furnace, the lever 14 is moved in the opposite direction and as the yoke arms swing toward the horizontal position the cover turns about its axis until the stop 9 rests upon the arm 4, and finally the parts assume the positions shown in Figs. 1 and 2.

While the invention is particularly desirable for furnaces it may be applied to other receptacles.

What I claim is 1. The combination with a receptacle having an opening, and a cover for said opening, of means for raising and lowering the cover and swinging the same to one side of the opening, and means for automatically turning said cover so that its lower side will face away from a vertical line passing through the opening when raised.

2. The combination with a receptacle having an opening and a cover for said opening, of means for raising and lowering the cover and swinging the same to one side of the opening, and means for automatically turning said cover, while being raised, so that its lower side will face away from a Vertical line passing through the opening, and for returning said cover, while being lowered, so that its lower side will face and extend over the opening.

3. The combination with a receptacle, having an opening, of a yoke hinged at one side of the opening, a cover pivotally mounted in the arms of said yoke, means for rocking the yoke to raise and lower the cover and means for automatically turning the cover about its pivotal axis so that its lower side will face away from a vertical line passing through the opening when the cover is raised and said lower side will face the opening when the cover is lowered.

4. The combination with a receptacle, having an opening, of a yoke hinged'at one side of the opening, a cover pivotally mounted in the arms of said yoke, means for rocking the yoke to raise and lower the cover and means for automatically turning the cover approximately one hundred and eighty degrees about its pivotal axis, and wlth its lower side facing away from the opening, when the yoke is raised.

5. The combination with a receptacle, having an opening, of a yoke hinged at one side of the opening, a cover pivotally mounted in the arms of said yoke, means for rocking the yoke to raise and lower the Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

cover and means for automatically turning the cover about its pivotal axis when the yoke is operated, comprising a crank arm connected to the cover, a stationary stop, and a stay forming a lost motion connection between said crank arm and stop.

6. The combination with a receptacle, having an opening, of a yoke hinged at one side of the opening, a cover pivotally mounted in the arms of said yoke, means for rocking the yoke to raise and lower the cover and means for automatically turning the cover about its pivotal axis when the yoke is operated, comprising a crank-arm connected to the cover, a stationary stop having a guide-opening, a stay-rod connected to said crank arm and extending through said opening, and a stop upon said rod adapted to engage the stationary stop when the cover is raised.

7. The combination with a receptacle having an opening, of a yoke hinged at one side of the opening, a cover pivoted at its edges between the arms of said yoke, means for rocking the yoke to raise and lower the cover, a stop upon the cover at one side of its axis adapted to rest upon the yoke when the yoke is lowered, an arm secured to the cover and extending at the opposite side of its axis, a stationary stop, and a stay forming a lost-motion connection between said latter arm and said stop.

8. The combination with a receptacle having an opening, of a yoke hinged at one side of the opening, a cover pivoted at its edges between the arms of said yoke, means for rocking the yoke to raise and lower the cover, a stop upon the cover at one side of its axis adapted to rest upon the yoke when the yoke is lowered, an arm secured to the cover and extending at the opposite side of its axis, a stationary stop arranged below the pivotal axis of the cover, said stop having a guide way, a stay rod connected to said latter arm and extending through said guideway, and a stop fixed to said rod below said stationary stop.

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

DAVID R. STEELE.

l/Vitnesses:

ROBERT WATSON, C. ROLLINS ROGERS.

Washington, D. G.

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