US1807661A - Molding press - Google Patents

Description

June 2, 1931. G. G. HEGHINIAN MOLDING PRESS Filed Dec. 3. 1928 J lo FIG- 6 R O m m N I famed jfly w A TTORNE Y.

Patented June 2, 1931 oNrrEo STATES GARABED' G. IEIEGHINIAN,

OF BALTIMORE, MARYLAND MOLDING PRESS Application filed December 3, 1928. Serial No. 323,419.

One of the objects of my invention is to have a press that will be compact, sell contained, light in weight, very simple, effective, low in price and easily operated.

Another object is to have a press that will indicate the pressure applied so that a fair comparison can be made about the relation of the pressure applied and the quality obtained.

0 Another object is to have a press that will distribute the pressureapplied on the molded material as desired, namely to apply more pressure at one place than is applied at another, (some place more and some place less,

at will).

Another object is to have a press that will regulate the depth of loose material fed into the die in such a way that there will be greater depth of loose material all around the edges, than at the center, so that when pressure is applied more material will be compacted all around the edges and corners than at the centre and thus produce articles like bricks or blocks with sharp, dense and clean cut edges and corners.

Another object is to have a press that will produce better edges and corners with low pressure. 1

Another object is to have a press that can produce bricks dense, smooth and less water absorptive on the ends and the sides, but porous and greater water absorptive at the middle of the flat faces, so that in construction, the center will adhere to the mortar easily, yet the outer dense face will produce a wall that will be a great deal more water proof than ordinary brick wall.

Another object is to have a press that can regulate the feeding of the loose material into the mold so that a brick or block can be produced with a depressed face on one or both fiat sides that will be a lighter brick in weight and yet in the wall it will occupy the space of a full sized brick. The depressed face can be utilized as or for a trade mark.

VVhen-loose material is fed to an opening like a die the material falls freely to the centre, nothing holds it back, but near the edges the friction of the side walls withthe falling material retards-their fall'and'often arcl es are formed. At the corners the condition is still Worse. The result is that the distribution of the material in'the die is not uniform, more material falls in the centre than anywhere else, and when pressure is applied the centre gets the most of the pressure. The result is poor edges and corners. The centre cannot hold and protect the edges and the corners but the edges and the corners can hold and protect the centre. Many attempts have been made to overcome this unfortunate natural common condition inherent in all types of presses. The universal method employed is to use high pressure so that after the centre gets all the pressure it can stand, 5 the excess material from the centre is forced laterally to the sides and corners, under vertical pressure. This is too costly. When the principle or" my invention is applied to any press the press will be able to produce pressed articles with better edges and corners under less than one-third ,1,) of the former pressure used. This means less power to operate the presses and also less wear and tear of machinery.

All these qualities cited above make this pressindispensable for testing and experimenting laboratories of every descriptionpublic, private, educational and commercial.

The main principles of this press are imso portant improvements for larger and multiple pressesused in quantity production and can be easily appli d to them.

Fig. 1 is a side View of a press assembled. Fig. 2 is an end view of the press assembled.

.. Fig. 3 1s a longitudinal section of the upper pa rtalong the line C-D.

. Fig. 4 is a cross-section along the line A-B.

Fig. 5is a top VlEW of the molding frame of'the press.

Fig. 6 is a bottom View of the molding frame of the press.

Fig. 7 is a brick or a block with a depres- 9 of the upper part sion on one of its flat faces.

Various parts of the press are designated with a numeral, and exact similar parts one or more in number, in the press arerepresented with the same number. let

All like numbers refer to like parts in all the figures.

1 is a molding frame or die body having upright bars 2 and bosses 3 with threaded openings therein for the reception of the bars 2. The bars 2 are provided with reduced portions 5 on their lower ends to form a shoulder (5, the reduced portion being threaded as at 7.

A base plate 8 has holes 9 therethrough for the reception of the portions 5 of the bars 2. A nut 10 secures the bars to the base plate as clearly shown in the drawings. Projections 11 and 12 are provided at one side of the die body 1 forming a space 13 therebetween and have holes 14 drilled therethrough for receiving a pin 15. A cover 16 having a lug 17 on one end has a hole therethrough to receive pin forming a hinge. The cover is provided with projections 19 and 20 on the other end and forms a space 21 between the said projections. A groove or depression 22 is formed on top of the projections 19 and 20 for a purpose hereinafter described. A rib 23 on top of the cover 16 is provided with a hole 24 for a handle 25 to be secured thereto. The die body 1 is provided with projections 26 and 27 at one side thus forming a space 28 between said projections. The projections 26 and 27 are provided with holes 29 to receive a pin 30 for securing a link 31 having a slot 32, the link being provided with holes 33 and 34.

A. handle 35 having a hole 36 through a flat portion 37 receives a pin 38 keyed to the handle 35 as at 39. The pin 38 has an eccentric portion 40 that extends on either side of the link 31.

The moldin frame 1 is constructed in such a manner as to have an opening 41 therein for receiving a plunger consisting of a main part 42 having a lower part 43 and an independently movable central part 44. A plate 45 is fastened to and made part of the main part 42 of the plunger.

As shown in Fig. 3, a slot 46 forms a flat face 47 on the main part of the plunger and a like face 48 on the bottom of the central part 44. Projected lugs 49 are received in slots 50 formed in the main part 42 of the plunger.

A plate 51 is secured to the underface of the molding frame 1 by means of bolts 52. The plate is provided with projections as at 53.

A hydraulic jack 54 has a ram 55 which is operated by means of a handle 56 secured in a socket 57 on a pivot or shaft 58 in the usual manner. The jack 54 is provided with a handle stop 59 and a pressure gage 60.

As shown in Fig. 6, the molded article has end, side and top faces 61, 62 and 63 respec tively and a depressed face 64 extending therein as indicated at 65.

The operation of the press is as follows: laking the parts in position as shown in Fig. 1. when the handle 35 is pulled away from the center of the press, the pin 38 being keyed on the handle 35, turns with it and the eccentric part 40 of the pin 38 rises from its seat 22 and releases the cover 16. At this position the link 31 with its eccentric pin that is extended on either side, will swing around the pin 30 as a hinge clear the cover projection 19, and drop into aposition as shown in Fig. 3. The cover 16 will swing around the pin 15, when lifted with the handle Fig. 3 shows the central part of the plunger 44 stopped in its downward movement by its lugs 49 resting on the extensions 53 of plate 51, that is secured to the molding frame 1. but the main part 42 of the plunger has gone further in its downward movement. It may go a little further yet, if permitted, until the plate 45 rests on the lug 49, stopping the central part. Permitting the main part to descend further down produces two different levels for the top surfaces of the plunger parts. The level all around the edges of the central part is lower than the level at the central part. When the loose material is fed into the die 41 to be compressed, it will be deeper all around the centre than it is at the center. After the die is filled up to the top, the cover 16 is lowered on top of the die, the link 31 is swung back over the cover projection 19 with the handle then the handle 35 is moved toward left as shown in Fig. 1. At this position the eccentric pin 40 rides on the curved depression 22 as a seat and locks the cover 16 to the molding frame 1. The cover in this locked position acts as an abutn'ient against which the loose material in the die 41 can be compressed by the plunger. When the main part of plunger 42 is raised by the hydraulic ram 55 the central part 44 at first remains still. The main part 42 of the plunger 43 rises and compresses the material all around the center until it rises high enough for its face 47 to come in contact with the bottom face 48 of the central part 44 and lift it up from its seat and carry it along for the rest of the movement upward distributing pressure all over the brick. The total pressure is indicated on the gage and can be raised to any amount within the limits of the press by the hydraulic ack 54 as desired. When the desired amount of pressure is reached. the jack is released, the cover is unlocked and lifted, then by the jack, the plunger is raised further up to eject the pressed brick.

If both the top and bottom face of the brick are desired to have flat faces, the top face of the central part 44 is made flush with the top face of plunger 42 when the central part rests on the main part 42. \Vhen thev are separated as is the case when they are at their low position their upper faces are a; difierent elevations. This difference of elevation is an index to the degree of the variation in density and water proofing quality between the edges, corners and the central part of a brick. When it is desired to have some depression made on the one or both of the flat surfaces, to reduce the weight of the brick but have the advantage of a full size brick, the two parts of the plungers are arranged so that even if the central part rests on the other its upper surface will have a higher level than the main part of the plunger.

I claim:

1. A press comprising a die body having a recess, a lower plunger in the said recess that has a central independently movable part which is normally held above the remainder part when the plunger is at its lowest position, an upper abutment to press the material put into the said die when the plunger is forced up and means for successively moving the central part and then moving the surrounding part to compress the edges to a greater degree than the centre.

2. A press comprising a die'body having a molding recess, a plunger operative in that recess, said plunger having a movable central part with lugs resting on the other main part and movable together until on their downward movement the said lugs of the central part are engaged and held by the die body while the main part of the plunger is left free to move further down alone.

3. A. plunger in a die having a movable central part with lugs, means to engage said lugs and stop the central part while the main outer part is still moving downward, thus producing a lower level all around the centre of the die to receive loose material in greater depth than at the centre, means for moving the outer part of the plunger upward while the central part stays stationary for a period of time and the excess depth of loose material all around is compressed to the edges and the corners, and means whereby when the main part of the plunger reaches the level of the central part of the plunger both parts are lifted together. 7

4.. A press having a die body with a recess, a swinging cover over the recess that can be locked to the die body to serve as an abutment against the action of a plunger-in said recess, means for locking the cover comprising a link pivoted to the die body at one end and having a handle and pin at the other end, said pin extending out to a distance on both sides of the link, the extended parts of this pin being eccentric in relation with its middle part, the middle part keyed to said handle, the cover having a curved depression to receive the eccentric part of the pin.

5. A press comprising a die body having a recess, an abutment over, and a plunger in, said recess, the plunger being made in two parts normally of different elevations of top surfaces in the recess, the diflerence in elevation of the top surfaces of the two plunger parts being greater at the position of receiving the charge of loose material into the said recess than the position of the final compression exerted by the plunger parts on the material in the recess against the abutment over the recess and means for moving the outer plunger part a greater distance than the other part.

6. A press comprising a main die having a passage, a cover therefor, a central pressing member supported within the die passage, a plunger having an edge pressing frame surrounding said central pressing member and having an abutment portion to lift the central pressing member after lifting said frame to compress the edges of the brick before and after the central portion has been pressed and then press both the edges and the central portion.

7. A press comprising a die having a passage, a plunger operable in said passage and consisting of an outer and an inner part, a stationary support on which the inner part rests in the loading position, the pressing surface of the outer part being normally below the pressing surface of the inner part in the loading position so as to ensure a greater depth of material over the outer part than over the inner part, and means for pressing the outer part upwardly, said inner part being normally spaced vertically away from the outer part and said outer part being constructed to automatically pick up the inner part after the material over the outer part has been partially compressed, the pressure stroke of the outer part being greater than the stroke of the inner part.

Signed at the city of New York in the county of Kings and State of New York this 30th day of November A. D. 1928.

GARABED G. HEGHINIAN.

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