US2215160A

US2215160A - Block forming mold

Info

Publication number: US2215160A
Application number: US243271A
Authority: US
Inventors: Charles H Rothmann
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-11-30
Filing date: 1938-11-30
Publication date: 1940-09-17
Anticipated expiration: 1957-09-17

Description

Sept. 17, 1940- c. H. ROTHMANN BLOCK FORMING MOLD Filed Nov. 30, 1958 N m W M W m W 0 a we. 1 a H 2 .WV 5 M w m 1 W 2 2 2 mg a 2. ,2 I

Patented Sept. 17, 1940 I UNITED STATES PATENT OFFICE 5 Claims.

This invention relates to block-forming molds, and has for one of its objects the production of a simple and efficient means forfacilitating the extraction of air fromthe plastic material while 5 the material is being tamped in the mold.

A further object of this'invention is the production of a simple and eflicient means for firmly clamping the pallet plate in a position whereby the pallet plate may produc'ea pumping action because of its flexible nature, while the material in the mold is being tamped.

Other objects and advantages of the present invention will appear throughout the following specification and claims.

This invention constitutes an improvement upon my previous patent relating to Block forming molds, issued September 19, 1933, No. 1,927,717.

In the drawing: a

Figure 1 is a front elevational view of the mold;

Figure 2 is a top plan view thereof 'a portion of which is broken away; v

Figure 3 is a fragmentary side elevational view of the upper portion of the mold;

Figure l is a vertical sectional view taken on line 4-4 of Figure 1;

Figure 5 is a horizontal sectional view taken on line 55 of Figure 1; 1

Figure 6 is an enlarged vertical sectional view taken on line 66 of Figure 5;

Figure 7 is a diagrammatic view illustrating the manner in which the pallet plate flexes to produce a pumping'action.

By referring to the drawing, it will be seen .35 that A designates the main frame of the mold which comprises a pair of upstanding side walls l0. Each side wall I is provided with front and rear laterally and outwardly extending flanges H and 12. The side walls I!) are firmly braced 40 throughout their center by means of a transversely extending bracing member 13 which is secured to the inner faces of the walls ID in the manner shown in'Figure intermediate the ends of the walls and the front and rear faces thereof and this bracing member I3 is suitably shaped to sufliciently support molds of various types. Vertically adjustable set screws M are carried by this bracing member l3 for the purpose of bracing the bottom plate l5, such as is illustrated in Figure 4. The particular shape of the bracing member l3 by providing the offset portion I6 will facilitate the support of the base plate when molds of different types are used, such for instance as when forming curb block as is illustrated in my previous Patent #1,927,717. The

walls l0 may also be braced by means of suitable transverse bracing members H.

A shape forming moldplate I8 is supported within the mold frame A and maybe locked in position in any convenient manner common to the trade. This plate I8 is adapted to abut against the bottom plate IS in the manner shown in Figure 5. A suitable platform I9 is carried by the rear face of the frame A, as shown in Figures 3 and 4. 0

A suitable front door 20 is hingedly secured 1 at its lower end, as at 2|, to the frame A at a point below the bottom plate l5, which plate [5 is secured to the door 20. This plate I5 is provided with a downwardly extending flange 22, and this flange is bolted to the door 20 by means I of bolts 23 extending through the apertures 24 formed in the door. These apertures 24 are vertically aligned to provide for the vertical adjustment of the bottom plate l5 when desired to facilitate the molding of a block of suitable size. The door 2| is provided with a stop plate 25 extending below the door, which plate is adapted to abut against the brace l3 when the door is swung outwardly and limit the downward movement of the door.

It should be noted that the door 20 is of slightly less width than the front opening 26 of the frame A, as shown in detail in Figures 1, 2, 5 and 7. A relatively thin and flexible metal pallet plate Z'lfits across the front opening 26 to close the opening adjacent the door 20 and this plate 21 overhangs the front flanges ll of the side walls ill. The door 20 is adapted to engage the outer face of this flexible metal plate 21 in the manner shown in Figures 2 and 5 and because of the fact that the door 20 is of less width than the front opening 26 of the frame A, a pinching action will be produced between the front corners of the side walls I0 and the side edges of the door 20, causing the plate 21 to bow slightly inwardly at its center and permit the plate 21 to act as a diaphragm as described in the following.

Hook brackets 28 are carried by the front flanges H of the side Walls Ill near the upper ends thereof, which hook brackets 28 are provided with upwardly extending flanges 29 which are slightly curved outwardly behind which the clamping levers 30, which are pivotally secured, as at 31, to the upper end of the door 20, are adapted to fit to provide a wedging and .clamping action to draw the door 20 tightly against the pallet plate 21 and to provide the pinching action upon the plate 21 between the edges of the door 20 and the corners of the side walls [0. The

mounting of the plate 2! in the manner defined is very important from the standpoint of the present invention because of the particular pumping action obtained while the plastic material, such as the material 32, is being tamped by a tamping tool 33. The material 32 is placed between the mold plate I8 and the pallet plate 21 and is tamped downwardly in a manner such as is indicated in Figure 4, and as this tamping is continued in building up the block, the pressure of the tamp upon the moist material will cause the plate 21 to act in somewhat the same manner as a diaphragm and to flex toward and away from the door or inwardly and outwardly with respect to the plastic material 32 thereby providing a pumping action which will facilitate the extraction of air from the plastic material" while it is being tamped, and in this way permit the formation of a plastic block eliminating air bubbles and air pockets and providing substantially solid plastic molded block when completed. This spring action simulatinga diaphragm because of the flexible nature of the plate, is possible due to the fact that the plate is clamped in position by means of a pinching action as described, and although 'the inward flex of the plate is very minute and is hardly visible to the naked eye, this vibration of the plate caused by the tamping does actually produce a pumping action across the entire area of the plate 21 facilitating the extraction of air from the plastic material 32. While the tamping of the material will naturally extract some of the air, the automatic pumping action of the plate will greatly speed up the work of extracting the air from the plastic block because of the pumping action and the efiect of the plate 2'! across the entire front area of the plastic material 32 while it is being formed into a plastic block. As shown in Figure 4, the lower edge of the plate 21 is adapted to rest upon the upper face of the base plate I 5.

It should be further understood that the plate 21 may be of any suitable or desired heighth to suit the type of block which is being formed and it is highly advisable to mold the block in a manner whereby the narrow edge of the block extends in a vertical direction, this facilitating greatly the tamping as well as the extraction of the air.

It should be understood that certain detail changes in the mechanical construction may be employed without departing from the spirit of the invention, so long as such changes fall within the scope of the appended claims.

Having described the invention, what is claimed is:

1. A mold of the class described comprising a body having an open front portion, a door constituting a front wall of said body, and a flexible pallet plate fitting across the open front portion of said body and overlapping portions of the body, said door engaging said pallet plate inwardly of the body for clamping the pallet plate in spanning relation across the open front portion of the body, said plate being adapted to flex as plastic material is tamped within the body to produce a pumping action to facilitate the extraction of air from plastic material within the body.'

2. A mold of the class described comprising a body having an open front portion, a door constituting a front wall of said body, a flexible pallet plate fitting across the open front portion of said body and overlapping portions of the body,

said door engaging said pallet plate inwardly of the body for clamping the pallet plate in spanning relation across the open front portion of the body, said plate being adapted to flex as plastic material is tamped within the body to produce a pumping action to facilitate the extraction of air from plastic material within the body, and means for clamping said door in a closed position.

3. A mold of vithe class described comprising a body having an open front portion, a door constituting a front wall of said body, a flexible pallet plate fitting across the open front portion of saidbody and overlapping portions of the body,

' said door engaging said pallet plate for clamping the pallet plate across the open front portion of the body, said plate being adapted to flex as plastic material is tamped within the body to produce a pumping action to facilitate the extraction of air from plastic material within the body, means for clamping said door in a closed position, and said open front portion being of greater width than the door whereby the pallet plate will flex slightly inwardly as the door is clamped in a closed position.

4. A mold of the class described comprising a body having an open front portion, a door constituting a front wall of said body, and a flexible pallet plate fitting across the open front portion of said body and overlapping portions of the body, said door engaging said pallet plate for clamping the pallet plate-across the open front portion of the body, said plate being adapted to flex as plastic material is tamped within the body to produce a pumping action to facilitate the extraction of air from plastic material within the body, clamping levers overlying the body and door for clamping said door in a closed position, means receiving the levers for holding the same in a clamping position, and said door engaging the pallet plate inwardly of the walls of the body for flexing the plate slightly inwardly of the'body as the door is clamped in a closed position.

5. A mold of the class'described comprising a body having an open front portion, a door constituting a front wall of said body, the open front portion being of slightly greater width than the door, a flexible pallet plate fitting across the open front portion and overlap-ping the side edges of the body portion, cl'ampinglevers carried by the door, means carried by the body for receiving the levers, the levers being adapted to be swung into engagement with said last mentioned means for tightly drawing the door to a clamping position whereby the side portions of the pallet plate will be firmly clamped in a pinching action between the side edges of the door and the side edges of the body of the mold, the pallet plate being of CHARLES H. ROTHIWANN'.