GB2327217A

GB2327217A - Solid core chalk dispenser

Info

Publication number: GB2327217A
Application number: GB9714535A
Authority: GB
Inventors: Colin Michael Fowler
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-07-11
Filing date: 1997-07-11
Publication date: 1999-01-20
Also published as: GB9714535D0

Abstract

A solid core chalk dispenser has a firm core 2 which provides a solid point giving a back pressure sufficient to force any residual chalk 1 through the elastic cotton nylon woven fabric 3 ensuring that any wastage due to the natural pore closure of the fabric as it contracts is at worst minimized at best eliminated. The 'chalk' may comprise magnesium carbonate and other natural dehydrants, and is dispensed when the dispenser is manually squeezed.

Description

SOLID CORE CHALK DISPENSER This invention relates to a solid core chalk dispenser.

The chalk dispenser is a known product, be it disposable or refillable, where a measured amount of magnesium carbonate, or a blend of magnesium carbonate, and other natural dehydrants, hereafter referred to as "chalk", is contained in an elastic cotton nylon woven fabric finished with either a single or double, internal or external fastening to provide a sealed unit. The chalk is dispensed by manually squeezing the chalk dispenser.

Of these dispensers the disadvantage is that, as they are used and the volume of chalk diminishes, the pores in the woven fabric mesh shrink thus reducing the amount of chalk dispensed ergo reducing the efficiency of the chalk of the dispenser resulting in a large residual amount of chalk unobtainable to the user. This amount is totally wasted.

According to the present invention a core, by nature firmer than the surrounding chalk filling of the woven mesh sack, is inserted. In use, as the amount of chalk diminishes the firm core provides a solid point to provide a back pressure thus forcing any residual chalk through the shrinking pores ofthe woven cotton nylon mesh.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawing in which: Fig. 1. Shows in section a solid core chalk dispenser.

Fig. 2. Shows in section the purpose and forces involved in the solid core chalk dispenser.

Referring to the drawing the solid core chalk dispenser comprises of a measured amount of chalk 1, and an inserted firm core 2, by nature more solid than the surrounding chalk contained within a elastic cotton nylon woven fabric 3, finished with a single or double internal fastening 4 or external fastening 5 to provide a sealed unit.

In use external pressure is applied manually, arrows 10, and chalk 1 is forced through the elastic cotton nylon woven fabric 3 as shown by arrows 11.

When a solid core 2 is inserted it provides a solid point to provide a back pressure, arrows 12, to force residual chalk 1 through the naturally shrinking pores ofthe elastic cotton nylon woven mesh 3.

Claims

1. A solid core chalk dispenser, be it disposable or refillable, comprising of a measured amount of magnesium carbonate, or a blend of magnesium carbonate and other natural dehydrants, hereafter referred to as "chalk", with an inserted firm core, by nature more solid than the surrounding chalk contained in an elastic cotton nylon woven fabric finished with either a single or double, internal or external fastening to provide a sealed unit.

2. A solid core chalk dispenser as claimed in claim 1 wherein the solid core provides a firm point to force the chalk through the shrinking pores of the elastic cotton nylon woven fabric, a shrinkage which is the natural reaction of the elastic cotton nylon woven fabric to the reduction of the volume of the chalk filling through usage.

3. A solid core chalk dispenser as descibed in claim 1 and claim 2 substantially as described herein with reference to figure 1 and figure 2 of the accompanying drawings.