# US 4,393,856 A · Apparatus for milling building blocks

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- Number: US 4,393,856 A
- Document ID: US4393856A
- Status: Granted
- Kind: A
- Application number: 06/240,535
- Filed: 1981-03-04
- Granted: 1983-07-19
- Earliest claimed: 1980-03-13
- Inventors: Siegfried Gebhart
- Web page: https://patentgrep.com/patent/US4393856A

## CPC

- B28D 1/18: by milling, e.g. channelling by means of milling tools
- B28D: WORKING STONE OR STONE-LIKE MATERIALS

## Abstract

Apparatus for milling building blocks comprise a first arrangement for milling said blocks at a first side thereof, and a second arrangement for milling said blocks at a second side thereof. Apparatus are located between the mentioned first and second arrangements for accelerating the blocks after their milling at the first side. Apparatus further are located between one of the mentioned first and second arrangements and the accelerating apparatus, for turning the blocks for their milling at a second side thereof by 180.degree. about an axis extending parallel to the direction of transportation of the blocks.

## Claims

### Claim 1

Apparatus for milling building blocks at opposite first and second sides in two steps, comprising in combination:
first means for milling said blocks at said first side thereof in a first one of said steps;
second means for milling said blocks at said second side thereof in the second one of said two steps;
third means located between said first and second means for accelerating said blocks in a direction of transportation of the blocks after said milling at said first side; and
fourth means located between one of said first and second means and said third means for turning said blocks by 180.degree. for said milling at a second side thereof;
said fourth means including a box having opposite open ends, with one open end providing an entrance for blocks and the other open end an exit for the blocks, and means including a frame for mounting the box for rotation by said 180.degree. about an axis of rotation parallel to said direction of transportation of the blocks.

### Claim 2 (depends on 1)

Apparatus according to claim 1, wherein:
said first means include a first conveyor for said bricks and an adjustable first milling shaft with milling blades, mounted above said first conveyor belt; and
said second means include a second conveyor for said bricks and an adjustable second milling shaft with milling blades.

### Claim 3 (depends on 2)

Apparatus according to claim 2, wherein:
said first and second conveyors are plate conveyors.

### Claim 4 (depends on 2)

Apparatus according to claim 2, wherein:
several guidance rollers having vertical axes of rotation relative to a conveyor plane are arranged along a milling path on both sides of each conveyor.

### Claim 5 (depends on 4)

Apparatus according to claim 4, including:
means for driving at least the guidance rollers on one of said sides.

### Claim 6 (depends on 4)

Apparatus according to claim 4, including:
means for adjusting at least the guidance rollers on one of said sides transversely to the direction of transportation of said blocks.

### Claim 7 (depends on 4)

Apparatus according to claim 4, including:
means including a rail adjustable transversely to a direction of transportation of said blocks, for rotatably mounting said guidance rollers.

### Claim 8 (depends on 1, 2)

Apparatus according to claim 1 or 2, wherein:
said third means include several driven transport rollers arranged consecutively and essentially horizontally.

### Claim 9 (depends on 8)

Apparatus according to claim 8, wherein:
said third means include several guidance rollers arranged bilaterally in consecutive order in a direction of transportation with essentially vertical axes of rotation.

### Claim 10 (depends on 9)

Apparatus according to claim 9, wherein:
said guidance rollers are at least on one side jointly positioned on a girder that is adjustable transversely to the direction of transportation.

### Claim 11 (depends on 1)

Apparatus according to claim 1, wherein:
said box has a floor and a ceiling provided with drivable rollers.

### Claim 12 (depends on 1, 11)

Apparatus according to claim 1 or 11, wherein:
said box has on both open ends rotary gate end plates mounted on the frame.

### Claim 13 (depends on 1, 11)

Apparatus according to claim 1 or 11, wherein:
one of said frame and said box is mounted on rails and transversely adjustable with respect to a direction of transportation of said blocks.

### Claim 14 (depends on 13)

Apparatus according to claim 13, wherein:
said frame is connected to the rails by means of a dovetail guide.

### Claim 15 (depends on 1)

Apparatus according to claim 1, including:
guidance strips adjustable transversely to a direction of transportation of the blocks and located on opposite sides of said box.

### Claim 16 (depends on 15)

Apparatus according to claim 15, wherein:
said guidance strips are covered on the sides facing the blocks with a friction reducing material.