Excavating – Peat excavators
Patent
1989-10-20
1991-02-26
Taylor, Dennis L.
Excavating
Peat excavators
37 58, E02F 388
Patent
active
049951750
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application claims the priority of Federal Republic of Germany Application No. P 37 14 073.6, filed Apr. 28th, 1987, which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
The invention relates to a pneumatic extraction head for underwater debris, in particular sand and gravel, comprising a housing, a base plate located at the bottom of the housing and forming an inlet opening for the debris and a flange plate located at the top of the housing for connection with an extraction pipe and a compressed air duct.
An extraction head of this type is known from DE-OS 22 41 526. With this extraction head, the extraction capacity is often not at an optimum due to the fact that compressed air is supplied only from the side and the debris inlet opening also extends laterally. In addition, this extraction head is subject to considerable, unsymmetric wear and tear which necessitates frequent servicing and repair.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the invention is to remedy these deficiencies and to improve the supply of compressed air in a generic pneumatic extraction head such that a large, constant extraction capacity can be attained with a minimum of wear and tear.
The object is accomplished in accordance with the invention by the following features: plate and the flange plate and surrounding the debris inlet opening, this connecting pipe forming an annular compressed air space between the inner wall of the housing and the outer wall of the connecting pipe, base plate in the compressed air space around the debris inlet opening and compressed air outlet openings.
BRIEF DESCRIPTION OF THE DRAWINGS
The following description of the preferred embodiment of the invention serves to explain the invention in greater detail in conjunction with the attached drawings, in which:
FIG. 1 is a schematic view of a pneumatic extraction head during removal of underwater debris;
FIG. 2 shows a longitudinal section of the extraction head of FIG. 1;
FIG 3 is a cross-sectional view along line 3--3 in FIG. 2;
FIG. 4 shows a partial section along line 4--4 in FIG. 3 and
FIG. 5 shows a longitudinal section of a different embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The apparatus illustrated in FIG. 1 comprises a float 1, on which a rebound tank 2 with a drainage channel 3 is arranged. Lifting jacks 4, 5 are arranged on the float 1 approximately at the same distance to the left and right of the rebound tank 2. These jacks each bear a motor-driven hoist 6 and 7, respectively. Cables 8, 9 which are indicated in FIG. 1 by dash-dot lines lead from these hoists to an extraction head 10 which is connected with the rebound tank 2 via a telescopic extraction pipe 11 which is variable in length. A compressed air duct 12 extends parallel to the extraction pipe 11. This compressed air duct opens at one end in the extraction head 10 and is connected at the other end with a pneumatic pump which is located on the float 1 but not illustrated. Apart from compressed air, pressurized water can be used as pressure medium. By activating the hoist 4, 5 the extraction head 10 can be lowered and lifted and thereby held in its operative position on the underwater debris 15. The duct 12 is a windable tube.
FIGS. 2 and 3 show the construction of the extraction head 10 in detail. A parallel piped housing 16 comprising a rear wall 17, a front wall 18 and left and right side walls 19 and 20, respectively, has at the bottom a base plate 21 and at the top a flange plate 22 which consists for its part of two layers 23, 24 which are connected with one another by connection plates 25 and reinforced. The extraction pipe 11 and the compressed air duct 12 are flange connected in the conventional manner to the flange plate 22, namely to its upper layer 24.
The rectangular base plate 21 encloses a debris inlet opening 26. A cylindrical connecting pipe 27 enclosing the debris inlet opening extends between base plate 21 and flange plate 22 such that an annular compressed air spac
REFERENCES:
patent: 3301606 (1967-01-01), Bruno
patent: 3585739 (1971-06-01), DeKoning
patent: 3585740 (1971-06-01), DeKoning
patent: 3756659 (1973-09-01), DeKoning
patent: 3791763 (1974-02-01), Faldi
patent: 4253255 (1981-03-01), Durell
patent: 4353174 (1982-10-01), Maloblocki
patent: 4386473 (1983-06-01), Amann et al.
McBee J. Russell
Taylor Dennis L.
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