KNOTWOOD – Spiked Steel Lattices for Bin Emptying Units

Many older bin emptying units, used in fibre blending operation, built by Houget Duesberg Bosson (HDB), Fallgatter and other machine builders, are fitted with KNOTWOOD spiked steel lattices. These lattices were manufactured for the machinery builders by Petrie & McNaught Ltd., of Rochdale, Lancashire.

Since 1993 these lattices have been made by specialist lattice manufacturer Elliott Musgrave Ltd., of Bradford, Yorkshire.

The lattices are constructed from rolled steel sections that connect to each other, and may be built using any combination of laths with “spikes” or “pins”, and “plain” laths (laths with no pins). As there are no driving chains or belts, damaged laths can be removed and replacement laths fitted, and lattices may be extended or shortened in length. The steel laths are hot-dip galvanised and the pins are zinc passivated.

Knotwood lattice lath section

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PINNED & PLAIN LATH COMBINATIONS.

Most Knotwood lattices are made with one pinned lath followed by one plain lath . Lattices may also be made with ALL the laths fitted with pins. It is also possible to follow one pinned lath with two plain laths.

 

Elliott Musgrave - looped pin measuring guide

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AVAILABLE PIN SIZES.

Three standard lengths of looped pin┬ámay be fitted – the length stated includes the fixing loop.

Overall pin length

Gauge

Imperial diameter

Metric diameter

Projection of pin

35mm sharp point

7 Gauge 0.176″ 4.47mm 17mm

40mm sharp point

7 Gauge 0.176″ 4.47mm 22mm

50mm sharp point

7 Gauge 0.176″ 4.47mm 32mm

50mm blunt point

7 Gauge 0.176″ 4.47mm 32mm

PIN PATTERN

The pitch of the pins along any lath is 63.5mm or 2.1/2″

The pins may be set in a lath in several patterns – they may be directly behind the preceding pinned lath, or they may be set to fall between the pins on the first pinned lath.

In some cases the pins fall exactly between the pins in the preceding lath – there are TWO TYPES of pinned lath in this combination.

In some cases the pins in the second lath fall one third of the pitch from the pins in the first lath, and the pins in the third lath fall two thirds of the pitch from the pins in the first lath. There are THREE TYPES of pinned lath in this combination.

In some cases the pins in the second lath fall one quarter of the pitch from the pins in the first lath, the pins in the third lath fall exactly on half the pitch from the pins in the first lath, and the pins in the fourth lath fall three-quarters of the pitch from the pins in the first lath. There are FOUR TYPES of pinned lath in this combination.

In a standard lattice, with a pinned lath followed by a plain lath, the pattern of the pinning of the pinned laths does not affect the cost of the lattice.

PIN LENGTH CONSIDERATIONS

The length of the pin depends on the clearance between the bin floor and the lattice. There are three distinct ranges of HDB bin emptying units.

The older units have lattices with 35mm pins, projecting 17mm measured along the pin angle.

An intermediate range of machines have 50mm pins, projecting 32mm measured along the pin angle.

The most recent machines have 40mm pins, projecting 22mm measured along the pin angle.

While the general specification of the lattices is the same in terms of width of lattice, it is important to check the size of the pins.

MACHINE WIDTH – BASIC DATA

Houget Duesberg Bosson (HDB) built machines in several “standard” widths. There are a few non-standard machines in existence, built by H.D.B. or other builders, and the following information should be treated only as a general guide.

The lattices are measured OVERALL width, to include the small end lugs on each lath. These lugs may wear away, and the steel lath itself may be approximately 13mm shorter than the overall width. Hence, it is useful to supply both the overall width and the length of the bare steel lath.

Nominal width of Bin Emptying Unit

3.0 metres

3.5 metres

3.9 metres

4.0 metres

4.5 metres

Overall width of lattice including end lugs

2374mm

3384.65mm

3797mm

3874mm

4374mm

 

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