US1382041A - Machine eos making molds - Google Patents

Description

C. B. WORTH.

MACHINE FOR MAKING MOLDS.

APPLICATION FILED OCT. 22, 1920.

1,382,041 Patented June 21, 1921.

l/Vl/E/VTO/F C15. 50797772 ATTORNEYS prrso STATES CHARLES B. WORTH, OF CHICAGO, ILLINOIS.

MACHINE FOR MAKENG IVIOLDS.

Specification of Letters Patent.

Patented June 21, 1921.

Application filed October 22, 1920. Serial No. 418,827.

To all whom it may concern:

Be it known that l, CHAnLns B. WORTH, a citizen of the United States, and a resident of Chicago, in the county of Cook and State 01 Illinois, have invented a new and use'lui Improvement in Machines for Making Molds, of which the following is a full, clear, and exact description.

My invention relates to improvements in machines for making molds, and it consists in the combinations, constructions and arrangements herein described and cla med.

An object of my invention is to provide a machine for making molds for castlngs having means for throwing mold forming material at high velocity directly into a flask.

A further object oi my invention 1s to provide a device of the type described that has means for varying the speed of operation of the sandthrowing or projecting means therein wherefore the sand is packed with greater or less density as desired.

further object of my invention is to provide in a device of the type described a novel "form of apparatus for projecting the sand forcibly into molds.

A further object of my invent on 18 to provide a dev'ce of the type described having means for packing sand in a flask with uniform regularity and velocity to insure the rapid "formation of satisfactory molds.

A further object of my invention is to provide a device of the type described that is relatively simple in construction and operation, effective for the purpose intended, and thoroughly practical commerclally.

()ther objects and advantages will appear in the following specification, and the novel features or the invention will be particularl y pointed out in the appended claims.

lily invention is illustrated. in the accompanying drawings, forming part of this application, in which Figure 1 is a side elevation of the device,

Fig. 2 is an enlarged detail, partly in section, of a fragmentary portion of the dev ce,

Fig. 3 is a View of a fragmentary portion of the device, i

v Fig. 4c is a perspective vlew of a portion 01 the device.

I am aware that machines have been provided prior to my invention for forming molds. However, such machines have not been entirely satisfactory in service in that they were provided with rotors adapted to receive the sand on their peripheral edges or above the central line thereof and consequently the sand was scattered by the normal action of the rotor. It has therefore been necessary to provide a stationary member, such as a casing, to deflect the sand dispelled by the centrifugal force of the rotor into the flask. Furthermore, ll am not aware of any machine that is adapted to be operated at varying speeds to vary the velocity at which the sand is projected into the flask. It is well known that molds for steel castings must be formed more compactly and regularly than molds for gray iron castings and the like. It is therefore necessary to throw or project the sand at greater velocity in forming molds for steel castings than in forming molds for iron castings. L

My improved machine for making molds is provided with a paddle-shaped head that is moved at a high'rate of speed to shear a wad of sand from a continuous descending stream and to project the same at a high ve locity directly into a flask without any portion of the wad being thrown against a casing and without the wad being disrupted by a centrifugal force, such as is occasioned by the operation of a rotor, as has been the case in machines of which I am aware, prior to my invention. My improved machine for making molds can be used for forming molds for either steel, gray iron, or other castings, since the paddle-shaped head can be operated at varying speeds to cause the sand to be projected into the flask at different velocities.

In carrying out my invention, ll provide a base 1, surmounted by a vertical spindle 2. The hub 3 of an arm 4t is mounted on the spindle 2, preferably anti-tfrictionally, as at 14, for movement in a horizontal plane. The arm 4 in the form of the device now preferred by me is formed of a plate webhed for the sake of lightness. A brace 5 secured to the base 1 in any suitable manner is bent at 6 and secured to the spindle 2 at its upper end as'at 7 by any suitable means (none being shown).

The arm 4: has spaced apart enlargements 8 and 9 at its remote end, such enlargements being formed with vertical alined bores 10 and 11, respectively, such bores being enlarged at 12 and 13, respectively, to receive the ends of a sleeve 15 that is disposed there between, the bore of the sleeve being sub stantially equal in size to the bores 10 and 11 and being vertically alined therewith. The hub 16 of a second arm 17 is mounted on the sleeve 15, preferably auti-frictionally, as at 21, for movement in a horizontal plane The distant end of the arm 17 is formed to provide a bracket 18 to which is secured, as by bolts 20, a casing or hood 19. It will be noted that the hood or casing 19 is disposed at right angles to the arm 17 and that the lower end thereof is open.

A motor 24 having a drive shaft 26 journaled in the sleeve and depending therebelow is secured by bolts to a bracket 22 carried by the arm 4 and secured thereto in any suitable manner, as by means of bolts 23.

friction drive disk 27 is carried at the lower end of the shaft 26 to rotate therewith. A horizontally disposed driven shaft 28, journaled in bearings 29 and 30 that are integral with the arm 17, has the inner end thereof positioned at a spaced distance below the friction drive wheel 27, the extreme end of the shaft intersecting the vertical plane of the axis of the drive shaft 26. The shaft 28 is provided with a feather adjacent its inner end, wherefore a driven disk or wheel 32 mounted thereon for frictional engagement with the drive wheel 27 is held to rotate with the shaft 28 but is slidable therealong.

It will therefore be obvious that I may vary the rate of speed of the driven shaft 28 at will by moving the friction driven wheel 32 toward or away from the center of the friction drive wheel. The wheel 32 is formed with a hub 33 provided with a flange at its end. A yoke 35 is loosely mounted on the hub 33 between the flange 34 and the disk 32 and is pivotally connected at 38 by an a "m .36 to a lever 39 that is fulcrumed at 39 on the arm 17. The arm 36 is guided in its movement by a guide member 37 secured to the adjacent portion of the arm 17. he lever 39 is operated by a lever 43 that is fulcrumed on the casing 19 and is connected to the lever 39 by means of a link 41, the connections being pivotal as at 40 and 42. One end of the lever 43 is formed to provide a handle 44 adapted to be grasped by the hand. A ratchet wheel 45 secured to the casing 19 engages with a pawl 46 carried by the lever 43, thereby providing a means for uniformly maintaining the speed of rotation of the shaft 28 at any desired rate. The pawl is connected by the link 49 to a spring actuated hand grip 47 that is secured at 48 to the lever 44 and may be grasped by the hand and moved toward the handle 44 to permit operation of the levers 43 and 39 and therefore adjustment of the friction driven disk 32 with respect to the friction drive disk 27.

The outer end of the driven shaft 28 projects within the casing 19 and has mounted thereon the hub 50 of a disk 49. A beam 52 is operatively connected eccentrically intermediate its length to the disk 49 by a wrist pin 51. One end of the beam 52 is pivotally connected at 53 to an arm 54 that is pivoted at 55 on the inner wall of the casing. A concaved paddle-shaped head or projector blade that is formed, as clearly shown in Fig. 4, with a body portion 54 provided with side walls 55, and 55, and an end wall 55 is adjustably secured to the beam 52 adjacent one end thereof. To this end, the body portion 54 has a centrally positioned handle or clamping portion 56 adapted to receive the end of the beam 52 and to be secured in adjusted position therealong by means of a key 57 or the like.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. The sand to be used in making the mold is conducted by any suitable means, as by a conveycr 58 driven by a motor 59, to a riddle or screen 60 positioned as shown. It will be observed that the riddle is supported by arms 61 and 62, which are pivotally connected to the riddle 60 adjacent the ends thereof, as at 65 and 66 and to a frame 67, as at 62 and 64. The frame 67 is secured to the arm 4 to swing therewith in any suitable manner as by means of bolts 68 and 69. A connecting rod 70 having pivotal connections at 71 and 72 with the arms 62 and 61, respectively, is connected ecccntrically by a wrist pin 73 to a disk 74- rigidly mounted on the drive shaft 75 of a motor 76. The casing '77 of the motor 76 is secured to the frame 67 in any suitable manner as by means of bolts 78. It will thus be seen that the riddle 60 will be vibrated or oscillated by the operation of the motor 76, wherefore the contents thereof will be screened and sand for making the molds will bedeposited on a belt 79 passed around pulleys 80 and 81 that are mounted on stub shafts 82 and 83 journaled in vertical extensions 84 and integral with the fame 67. The belt conveyer 79 is passed around and driven by a pulley 86 that is mounted on the shaft The weight of the sand on the ('01)- veyer belt '79 will hold the same in operative engagement with the pulley 86.

The sand carried by the belt conveyer 79 is discharged into the open upper end 88 of an inclined chute 87 that is supported by a vertically disposed pivot pin 89 coaxially alined with the sleeve 15 and havinga bear in o; at 90 on an integral extension 91 to the bracket it will thus be seen that the rhute 87 is free to rotate in a horizontal plane with the arm 17 and that the open upper end 88 being positioned adjacent the axis of the sleeve 15 will always be in position to receive the sand discharged by the belt conveyer 79.

The lower end of the chute 8'7 terminates in the casing 19. the open end thereof regis tering with an opening in the inner wall of the casing. The sand will therefore flow in a steady stream from the inlet opening 92. It will be understood that a flask (not shown) in which the mold is to be formed is positioned directly below the casing 19. The friction driven wheel 32 is positioned relative the friction drive wheel 27 to occasion the driving of the shaft 28 at the rate of speed desired. The beam 52 will thereupon be operated to move the paddle or projector blade across the inlet opening 92 with a forward and downward stroke. The head or projector blade 54 has walls along its sides and forward end. Consequently, the sand passing through the inlet opening 92 will. be sheared from the stream by the forward and downward stroke of the projector blade, guided by the side and end walls against the body portion to form wads, and projected at a high velocity directly into the flask below. The sand will be cast from the head or projector blade when the latter reaches the limit of its downward stroke and will therefore travel in a straight vertical path to the flask.

Heretofore, in machines for making molds of which l am aware, the sand has been delivered to a sand projector which is cylindrical in form at a point above a horizontal plane extending through the axis of the sand projector, Consequently, the rotary motion of the projector would tend to disrupt the wads of sand received and would cast a considerable portion of such wads into the flask indirectly, as by first projecting the same against a wall of the casing from which the sand is deflected into the flask.

A suitable means for illuminating the easing 19 and the flask position therebelow, such as an electric light 93 provided with a shield 94, may be disposed within the easing 19. The disk 4-9 may be counterweighted as by being webbed adjacent its connection with the wrist pin 51. The chute 87 may also be formed with longitudinally extending corrugations 96 to prevent lateral movement of the sand passing therethrough when the arm 17 is being swuugabout its axis or the arm 4 is moved about its axis and to preelude interruption to the continuity of the even stream of sand passing through the inlet opening 92.

i t is obvious that the device may be readily moved from place to place and may be rendered portable by being provided with wheels or the like (not shown). The machine has a range suflicient for the service for which intend-ed, since the arms 4L and 17 may be swung as a unit about the spindle 2 and the arm 17 may also be independently moved about its pivotal connection with the arm a.

I claim:

1. A, machine for making molds comprising a support, a casing, means for maintaining said casing on said support for movement in a horizontal plane, means for con ducting mold forming material in a stream into said casing, a projector blade mounted in the casing for movement in a substantially elliptical path passing downwardly and forwardly through the stream of mold forming material, and m ans for operating the projector blade. I

2. Tu a machine for making molds, the combination of means for projecting a mold forming material into a flask, said means comprising a projector blade having side walls and one end wall, a casing movably supported for movement in a horizontal plane, said casing having an inlet in its side walls, means for feeding the mold forming material through said inlet into the easing in a constant stream, means for adjust ably mounting said projector blade within the casing for movement in a substantially elliptical path passing downwardly and forwardly through the path of the stream of mold forming material adjacent the inlet,

said projector blade being positioned horizontally with its end wall forward, and means for operating said projector blade at a high rate of speed to cause the shearing of wads of mold forming material from the stream and the projecting of said wads downwardly in a direct vertical path.

3. Tn a machine for making molds, the combination of a projector blade, a casing therefor provided with an inlet for a stream of mold forming material, means. for supporting the projector blade and the casing relative to each other so that the projector blade mounted for movement in an elliptical path, passing downwardly and forwardly through the stream of mold forming material, and means for operating said projector blade.

41-. in a machine for making molds, the combination of a projector blade, means for nmvably supporting said projector blade for movement in an orbital path, means for operating said projector blade, and means for operating said last named means to vary the rate of speed thereof at will.

5. In a machine for making molds, the combination of a support, an arm pivoted thereon for movement in a horizontal pland, means supported by said arm for projecting a mold forming material into a flask, means for operating said first named means, and means for varying the operation of said second named means at will to vary the rate of speed of said first named means.

6. In a machine for making molds, the combination of a support, an arm mounted on said support for movement in a horizontal plane, a motor carried by said arm, a drive shaft for said motor, means actuated by said drive shaft for projecting sand into a flask, and means associated with said last ill) named means for varying the rate of opera tion of the latter at will.

7. In a machine for making molds, the combination of a support, an arm 1I.l()lllli,i;; on said support for movement in a horizontal plane, a casing supported by said arm, means for. conducting a mold forming material into said casing in a constant stream,v a projector blade, means for mounting sa projector blade within the casing for move ment in a substantially elliptical path p11 ing downwardly and forwardly through the stream of mold forming material, and meant for operating said projector blade.

8. In a machine for making molds, the combination of a support, an arm mounted on said support for movement in a horizontal plane, a casing supported by said arm, means for conducting a mold forming material into said casing in a constant stream, a projector blade, means for mounting said projector blade within the casing for movement forwardly and downwardly through the stream of mold forming material, means for operating said projector blade and including a transmission mechanism of a friction device type, and means connected with the transmission mechanism and mounted on the casing for controlling the operation of said last named means to vary the rate of movement of the projector blade at will.

9. In a machine for making molds, the combination of a casing open at its lower side, said casing being formed with an inlet opening in one side wall thereof, means for mo'vably supporting the casing, means for conducting mold forming material into the casing in a steady stream through the inlet opening, a projector blade, means for mounting said projector blade within the casing adjacent the inlet opening for movement in a substantially elliptical path passing downwardly and forwardly across the path of the stream of sand, and means for operating the projector blade to project the mold forming material downwardly in a direct vertical path.

10. In a machine for making molds, the combination of a casing open at its lower side, said casing being formed with an inlet opening in one side wall thereof, means for movably supporting the casing, means for conducting mold forming material into the casing in a steady stream through the inlet opening, a projector blade, means for mounting said projector blade within the casing adjacent the inlet opening for movement forwardly and downwardly across the path oi the stream of sand, means for operating the projector blade to project the mold forming material downwardly in a direct vertical path and including a transmission mechanism of a friction drive type, and means connected with the transmission mechanism and mounted on the casing for controlling the operation of said last named means to vary at will the rate of movement of the projector blade.

11. In a machine for making molds, the combination of a casing having its lower side open and having an inlet through a side wall thereof, means for movzbly supporting the casing, means for feeding a mold Forming material through said inlet in a constant stream, a motor supported by said first named means, a drive shalt for said motor, a friction drive disk fixed to said drive shaft at its end, a driven sha'lt journaled in said first named means and having its end projecting within the casing, a friction driven disk mounted on said driven shaft for rotation therewith and being movable therealong, said driven disk being adapted to engage with said drive disk and to be driven by the latter, means connected with said driving disk and mounted on the casing for moving said driven disk relative the center of the drive disk to vary the rate 01'? speed oi? the driven shaft, a disk mounted on the end of the driven shaft projecting within the casing, a beam connected eccentrically intermediate its length with said last named disk, said beam being disposed parallel with the side wall of the casing having the inlet therein and adjacent thereto, a projector blade,

means for adjustably securing said projector blade on the beam adjacent one end there of and in position to be moved forwardly and downwardly across the path of the stream oi mold forming material, and means for pivotally connecting the other end of said beam with the casing, wherefore the projector blade is moved in an orbital path.

CHARLES B. WORTH-

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