Title of Invention


Abstract This FRUSTUM CON BLOCK comprises of two Concentric Concrete frustums. One bigger at the bottom and one smaller on top with angular side slopes. Four blocks three arranged in a triangular fashion at bottom with one block supported on the top offsets make one unit. Several units arranged from a configuration of breakwater structures and barriers for anti sea erosion structures for any length, width and height. The honey combed perforated structure formed by the assembly of several units with the slope taking the side angle of the frustum gives a solid wide ratio of 3:1 The perforated structure with slope dissipates wave energy when the wave impinges and enters the orifices of the structure. Such structures which dissipate wave energy prevent sea erosion and afford economical design of breakwater and anti sea erosion structure on shore and offshore PRICE: THIRTY RUPEES.
Full Text

This invention relates to a device in the form of twin CONCENTRIC FRUSTUMS called 'FRUSTUM CON' concrete blocks when assembled in the form groynes or breakwaters will prevent Coastal structures from wave damage and control beach erosion.
Various types of sea side structures made of natural rock, concrete blocks, tetrapodes, and cubes Tetrahedrons are generally designed based on experience to suit the location and wave forces to dissipate the wave energy and prevent sea erosion But it is not possible in many cases to analyse mathematically the efficacy of such structures made of blocks of different shape and sizes arranged in pell-mell fishier
The object of this invention is to design mathematically the break waters and groynes for technical and asthetical Adequacy to withstand the given wave forces by assembling the blocks to the required shape and dimensions of the barrier and its locations.
This invention is a novel, concrete, geometrically shaped blocks made up of two concentric frustum of cones. The top frustum is smaller in diameter while the bottom frustum is bigger in diameter and broad based for stability. The dimensions of the blocks and frustum angle are designed and staked to form a perforated barrier automatically, from end to end when assembled, for the required calculated optimum solid-void perforations allow entry of water flow to weave through ,the semi circular path in a stream line fashion and dissipate the wave energy during entry and exit.
The circular shape suits perfectly for the waves that impinge from any direction and of any magnitude and counter the hydro-dynamic forces and are ideal to dissipate the, vive energy, compared to any other form of blocks-
shape of the breakwaters takes its shape and matches with tapering angle of the frustums-
The blocks are assembled in the form of trapezoidal section or a parellelogram or any designed shape to suit the bunds along the seashore-
The application of the assembly of blocks suits well for Breakwaters, for Docks, Groynes and for structures in ports, harbours, off-shore structures’ Another important application is for use as TALUS with one or more layers of blocks- They can be reverted to the aprons to dissipate the energy caused by hydraulic jump below the spill way of dams and in canals below drops to maintain constant velocity-
The advantages of these FRUSTUM BLOCKS are as follows:

1- The frustum blocks are economical when rock is not available within amen
2. The blocks can be prefabricated at site and assembled or cast in situ. The
structure can be dismantled and reassembled-
3. The blocks are of well. defined dimensions and of geometrical
afford mathematical analysis,
4. The shore structure takes shape by itself when assembled to the required
length, width and height*
5. Perforations formed when assembled produces the best well-knit barrier and
dissipate the energy’
64 The blocks are viable for mathematical and Model analysis to obtain optimum efficiency while other types of structures are adopted from experience only and dumped in a pell-mell fashion and not amenable for mathematical evaluation,
7- The assembly affords to pin point the required solid void ‘ the required wave force occurring at any point or level of the structure-
8. The semi circular curved surface of the blocks at any point of structure
gives the maximum efficiency" to dissipate the wave energy that impinge from
any direction and of any magnitude and at any level of the structure*
9. The blocks can be handled individually and stacked or dismantled and restacked-
10. The assembled structure or barrier gives a aesthetic appearance and can take
any shape and magnitude*
The drawings illustrate a single block and assembly-Fig* 1 This shows the plan of the assembled blocks with a set of 3, No, 1 blocks forming the bottom layer and the single block No*2 block forms the top layer making a single unit. Any number of layers can be assembled with several units to the required width, l’ ‘ wave flow- AB indicate cross-sectional arrangement as per Fig-3. ‘
Fig- 2 Shows the Isometric view of a model block made up of two frustums of
cones, the dimensions of which can be designed and adopted to withstand
the wave forces-
Fig. 3 Shows the cross-sectional arrangement when assembled indicating the No-1
r) and No-2 blocks forming perforations from one end to the other in the
entire structure- G.L- indicates ground level, ‘

1. A FRUSTUM CON BLOCK comprising of two concentric concrete
frustum one broad based bigger at tile bottom, and one smaller on
top with angular side slopes, four such frustum con blocks forming
one unit and an assembly of multiple units forming a sloping honey
combed perforated homogeneous interlocked structure to give a solid
void ratio of at least that can be varied, to dissipate and absorb
wave energy and counter wave forces of any magnitude and direction
for use in anti sea erosion and breakwater structures on shore and
off shore.
2. FRUSTUM CON BLOCK as claimed in claim 1 wherein three
frustum con blocks are assembled as base in a triangular fashion
supporting one block at the top on their side off sets, forming one
3. FRUSTUM CON BLOCK as claimed in claims 1 and 2 wherein the
said blocks when assembled in multiple units form a honey combed
perforated interlocked structure with a solid void ratio of at least 3:1
of any length, width and height.
4. FRUSTUM CON BLOCK as claimed in claims 1 to 3 wherein the
dimensions and the side slope angle of each block will be one and
the same for all blocks for any one designed structure and cannot be
of different size or angle.
5. FRUSTUM CON BLOCK substantially as herein described with
reference to and as illustrated in the accompanying drawings.


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1669-mas-1995 description(complete).pdf

1669-mas-1995 drawings.pdf

1669-mas-1995 form-1.pdf

1669-mas-1995 form-6.pdf

1669-mas-1995 form-7.pdf

Patent Number 192695
Indian Patent Application Number 1669/MAS/1995
PG Journal Number 02/2006
Publication Date 13-Jan-2006
Grant Date 17-Nov-2005
Date of Filing 18-Dec-1995
# Inventor's Name Inventor's Address
PCT International Classification Number E02B3/14
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA