METHOD AND APPARATUS FOR GAUGING VESSELS

Abstract: A method and apparatus for gauging vessels, e.g. drinking glasses, employ a gauging member (11) having a part (12) engageable with a vessel to locate the vessel axially relative to the gauging member and marking means (29) disposed at a predetermined spacing from said part and adapted to place a gauge mark on the vessel, said mark indicating the level to which the vessel must be filled to contain a predetermined quantity of liquid. To give improved accuracy, at least with some types of glass, the part (12) comprises an end portion of an elongated gauging member (11) and said end portion engages the interior of the vessel, preferably adjacent its base. Suction may be applied through the gauging member to hold the vessel in position for marking.

Description: TITLE: METHOD AND APPARATUS FOR GAUGING VESSELS DESCRIPTION This invention relates to a method and apparatus for gauging vessels and particularly but not exclusively for gauging drinking glasses. It is often necessary to apply a gauge mark to drinking glasses to indicate that when a glass is filled up to the mark it contains a predetermined quantity of liquid. When glasses are made by certain methods, e.g. by blowing into a mould, even though the operating conditions are carefully controlled to obtain glasses of the same size, there are unavoidably small variations in internal dimensions and contour. For this reason, it is necessary to gauge each glass to determine the correct position for the mark One known method is to calibrate a master glass and adjust a marking machine to a fixed distance between the rim of the glass and a marking wheel, the latter being opposite a gauge mark on the calibrated glass. Each glass to be gauged is then fitted to the machine in the same way and marked by the wheel. Thus, the distance between the rim and the gauge mark is the same for each glass. This known method is not always sufficiently accurate and it is an object of the present invention to provide for greater accuracy, at least with some types of glass. The present invention provides a method of gauging vessels which comprises moving a vessel and a gauging member axially relative to and towards each other until continued axial movement is prevented by engagement of a part of the gauging member with the vessel and then marking the vessel by marking means disposed at a predetermined spacing from said part of the gauging member, characterised in that said part of the gauging member is an end portion of the gauging member, and said end portion engages the interior of the vessel. While the end portion may engage the base of the vessel interior, it is preferred that it engages the interior at a position adjacent to but spaced from the base. There is a correlation between the inner contour of a glass and the volume within that contour. We have established that, if a disc-like or other symmetrically laterally projecting end portion of the gauging member with a predetermined diameter or width for a particular shape and size of glass is inserted into the glass until the end portion abuts the glass interior at a position adjacent to but spaced from the base of the interior, the marking means will always be in a correct position to mark the glass, giving a fixed volume from the gauging mark to the base of the glass within acceptable limits, regardless of the aforesaid variations in internal dimensions and contours between different glasses of the same shape and size. It will be seen that the basic difference between the method of the present invention and the prior art method referred to is that the latter measures from the rim and the present method measures from a position (preferably near the base) inside the glass. Preferably suction is used to hold the vessel in position during marking. The invention further provides apparatus for gauging vessels comprising a gauging member having a part engageable with a vessel to locate the vessel axially relative to the gauging member and marking means disposed at a predetermined spacing from said part, the marking means being adapted to place a gauge mark on the vessel when the vessel is axially located by said part, characterised in that the gauging member is insertable into the vessel and has an end portion constituting the aforesaid part and engageable with the interior of the vessel. Preferably, said end portion projects laterally and symmetrically from the gauging member, e.g. it is of disc like shape. Thereby, it can be made of predetermined width or diameter to engage the interior of a vessel at a position adjacent to but spaced from the base thereof. Preferably, the gauging member contains a duct through which suction can be applied to the interior of a vessel and carries a sealing member axially slidable thereon and resiliently urged towards said end portion for engagement with the rim of a vessel, whereby a vessel can be held in position by suction for marking. The sealing member may have associated therewith tapered guide means for locating the rim of the vessel. Normally, the gauging member will extend horizontally and be rotatable so that a vessel thereon can be rotated and engaged by a conventional marking wheel. The invention further provides, for use in carrying out the aforesaid method, a gauging head comprising an elongated gauging member with an end portion engageable with the interior of a vessel, said member containing a duct through which suction can be applied to the interior of the vessel, and a sealing member axially movable on the gauging member and resiliently urged towards said end portion for sealing the mouth of the vessel. The following is a description, by way of example, of one embodiment of gauging apparatus in accordance with the invention, reference being made to the accompanying drawing which shows a longitudinal section through the apparatus in use. The gauging apparatus comprises a gauging head 10 having an elongated gauging member in the form of a horizontal spindle 11 which is rotatable by means not shown and which is mounted to prevent axial movement. The gauging member has an end portion in the form of a disc 12 secured to an end of the spindle 11 and projecting laterally and symmetrically therefrom. Slidably mounted on the spindle 11 by means of a linear ball bearing 13 is an annular pad 14 in which are fixed guide rods 15. The rods 15 extend parallel to the spindle 11 and pass slidably through holes 16 in a collar 17 secured against rotational and axial movement on the spindle 11 by a set screw 18. A helical spring 19 is provided around the spindle 11 and bears at its ends against the pad 14 and the collar 17 so that the pad 14 is resiliently urged in a direction towards the disc 12. A ring 20 is secured to the spindle 11 by a set screw 21 to limit movement of the pad by the spring. On the opposite side of the pad 14 to the spring, there is disposed a thin spacing ring 22 against which bears an annular sealing member 23 of flexible elastomeric material. Beyond the member 23 is an annular guide member 24 having a frusto-conical face 25. The arrangement is such that the sealing member 23 is in air-tight relationship with the spindle 11. The spindle has an axial bore 26 opening through a central hole 27 in the disc 12. In use of the apparatus, a glass 28 to be gauged is moved axially over the end of the spindle 11. When the rim of the glass bears against the pad 14 through the intermediary of the sealing member 23, the pad will be moved axially until further movement of the glass is prevented by engagement of the edge of the disc 12 with the interior of the glass at a position adjacent to but spaced from its base. The periphery of the disc is shaped to avoid jamming of the disc in the glass. The engagement of the disc 12 in the glass is not air-tight and suction applied to the interior of the glass through the bore 26, the mouth of the glass being sealed by the sealing member 23, holds the glass on the spindle 11 at an axial position determined by the position of engagement by the disc 12. The guide member 24 assists in correct radial location of the glass when it is moved into position. While the spindle and the glass are rotating, a marking wheel 29 at a fixed horizontal location is raised into contact with the glass to cut a gauge mark round it. The marking wheel 29 is always at the same predetermined horizontal spacing from the disc 12 for glasses of a given shape and size and the position of the gauge mark on each glass therefore depends on the position of engagement of the disc 12 with the interior of the glass. Therefore, as previously explained, the position of the gauge mark will depend on the internal dimensions and contour of the particular glass so as to indicate the correct measure. The drawing shows a glass of frusto-conical shape, but the apparatus can be used with glasses of other shapes, e.g. of goblet and other curved shapes. The method and apparatus of the present invention are particularly useful for gauging stemmed glasses made by blow-moulding the bowls and drawing the stems from the bowls, since such glasses are particularly likely to vary in internal dimensions and contours.

Claims: CLAIMS 1. A method of gauging vessels which comprises moving a vessel and a gauging member axially relative to and towards each other until continued axial movement is prevented by engagement of a part of the gauging member with the vessel and then marking the vessel by marking means disposed at a predetermined spacing from said part of the gauging member, characterised in that said part of the gauging member is an end portion (12) of the gauging member (11), and said end portion engages the interior of the vessel. 2. A method as claimed in claim 1, characterised in that said end portion (12) engages the vessel interior at a position adjacent to but spaced from the base of the vessel interior. 3. Apparatus for gauging vessels comprising a gauging member having a part engageable with a vessel to locate the vessel axially relative to the gauging member and marking means disposed at a predetermined spacing from said part, the marking means being adapted to place a gauge mark on the vessel when the vessel is axially located by said part, characterised in that the -gauging member (11) is insertable into the vessel and has an end portion (12) constituting the aforesaid part and engageable with the interior of the vessel. 4. Apparatus as claimed in claim 3, characterised in that said end portion (12) projects laterally and symmetrically from the gauging member (11). 5. Apparatus as claimed in claim 3 or claim 4, characterised in that the gauging member (11) contains a duct (26) through which suction can be applied to the interior of a vessel and carries a sealing member (23) axially slidable thereon and resiliently urged towards said end portion (12) for engagement with the rim of a vessel, whereby a vessel can be held in position by suction for marking. 6. Apparatus as claimed in claim 5, characterised in that the sealing member (23) has associated therewith tapered guide means (24) for locating the rim of a vessel. 7. Apparatus as claimed in claim 3, 4, 5 or 6, characterised in that the gauging member (11) extends horizontally and is rotatable. 8. For use in carrying out the method as claimed in claim 1 or claim 2, a gauging head comprising an elongated gauging member (11) with an end portion (12) engageable with the interior of a vessel, said member containing a duct (26) through which suction can be applied to the interior of the vessel, and a sealing member (23) axially movable on the gauging member and resiliently urged towards said end portion for sealing the mouth of the vessel. 9. A gauging head as claimed in claim 8, characterised in that said end portion (12) is of disclike shape and projects symmetrically and laterally from the gauging member (11).

Inventors: FRANKLIN, DEREK
Applicants: DEMA GLASS LIMITED
Application year: 1982
Main classification: G01F25
IPC codes: G01F25, G01F19