GB2483865A - Hinge or template having markings to indicate drilling positions for mortising - Google Patents

Abstract

A hinge or template comprising location holes for marking centre point drilling positions used to facilitate material removal via an electric drill having an appropriate drill bit such as a spade drill. The radius of the spade drill and distance between the centre points is chosen to produce a series of overlapping circles such that the majority of the material can be removed (figure 11) with the remainder being chiselled out in order to recess the hinge. Preferably the hinge contour is rounded to match the overall area produced by the intersecting circles. Also disclosed is a modified spade drill (fig.8b) wherein the cutting surface is perpendicular to the drilling axis and has a shorter shank and body.

Description

I Hinge

This invention describes a door or window hinge.

The hinge designs described incorporate location holes to assist in marking centre point drilling positions used to facilitate wood removal via an electric drill using an appropriate drill bit, required to recess the hinge on a frame, door or window.

Two hinge designs are described with reference to the following drawings.

Figure 1 -shows a hinge design having a profile shape which matches the cut-out recesses made using a modified spade type drill bit and electric drill. Location holes (1) used to enable centre point drilling positions to be marked are shown. Screw fixing holes (2) are suitably located to avoid centre drilling locations (1).

Figure 2 -shows a hinge design having a conventional rectangular profile shape. Screw fixing holes (2) are suitably located to avoid centre drilling locations (1) Figure 3 -shows a simple pointed marking tool used to mark centre hole locations.

Figure 4-shows the pointed end of the marking tool.

(1) = Marking hole diameter (2) = Hinge cross section (thickness = t) (3) = Clearance (approximately 0.1mm) for marking tool (4) = Marking tool point (height of conical point is less than hinge thickness Figure 5 -shows typical centre location positions for each drilled cut-out required (1).

Figure 6a -shows a hinge design having a profile shape requiring 3 drilled cut-out recesses (for each half of the hinge) made using a modified spade type drill bit and electric drill.

Figure 6b -shows a hinge design having a profile shape requiring 4 drilled cut-out recesses (for each half of the hinge) made using a modified spade type drill bit and electric drill.

Figure 7-shows the use of an electric drill depth gauge to control cut-out depth of cut (1) = Electric drill (2) = Drill chuck (3) Spade drill bit (4) = Material being drilled (5) Depth gauge clamp (6) = Depth gauge (7) Depth gauge set to hinge depth of cut (typically 1 to 2 mm) Figure 8 -shows a comparison between a conventional spade drill bit (Figure 8a) and the modified drill bit (Figure Sb) proposed for this application. The modified spadç drill bit has a smaller shank (1) and body length (2) than a conventional spade drill bit. The modified spade drill bit has its main cutting edge perpendicular to the shank.

Figure 9 -shows use of the modified spade drill bit (shown in Figure Sb) to facilitate usage when physical space available may limit the overall length of the drill and drill bit combination, e.g. when door frame is narrow.

Figure 10 -shows two low cost templates (lOa & lOb) with pre-drilled holes which may be used as alternatives to the pre-drill centre marking holes incorporated into a shaped profile or conventional rectangular shaped hinge.

Figure 11 -shows the area of wood removal possible using the drilling methods described when applied to a conventional rectangular shaped hinge (having drill centre marking holes). The remaining unremoved wood ((1) -shown hashed) may be removed using a mallet and chisel.

Figures 1 2a and 1 2b -show the approximate positions of centre location holes relative to the edge of the material being drilled. Typical locations for the positioning centre holes is approximately 25% of the drill bit diameter from the edge of the door, window, door frame or window frame.

Figure 13 -shows small recess holes created by the pointed centre portion of a spade type drill bit when used to cut recesses required to fit a hinge.

(1) = Centre point of drill bit (2) = Recess holes created by centre point of drill bit. Hinge screw fixing holes are positioned to avoid recess holes A conventional rectangular shaped butt hinge is usually recessed into a wooden door, door frame, window or window frame. The cutout recess required is usually made using a suitable wood chisel and mallet. This recessing method requires a degree of skill and requires significantly more time and skill than the methods described below.

Figure 1 illustrates a hinge design with a profile shape which matches the cut-out recesses made using a spade type drill bit and electric drill.

The centre location for each required recess cut-out can be marked using a simple pointed marking tool -reference Figure 3. To mark the required hole centre's on a wooden door, window, door frame or window frame the hinge is positioned in its chosen position on the door, window, door frame or window frame and the marking tool is used to mark hole centre's by pushing the point of the marking tool through the location holes on the hinge -reference Figure 5. The diameter of each location hole will typically be between I to 2 mm. The conical point of the marking tool has a shallow angle, as illustrated in Figure 4, such that its point is guided to the centre of the marking hole by placement into the marking hole on the hinge.

The location of each positioning centre bole in the hinge is such that it will allow a spade type drill bit, as illustrated in Figure 8b, to be used to remove a proportion of the overall wood necessary for recessing the hinge. The positions of each marking hole on either half of the hinge is such that the centre of the drilled hole will not be too close to the edge of the door, window, door frame or window frame. Typical locations for the positioning centre holes is approximately 25% of the drill bit diameter from the edge of the door, window, door frame or window frame, as illustrated in Figure 12.

The designs shown in Figures 1 and 6a require 3 drilled out recesses to accommodate the hinge. The hinge arrangement may require more or less drilled out recesses depending on the size of hinge used. Figure 6b shows a design utilizing 4 drilled out recesses.

Although the fixing method described above is best suited to a hinge design that matches the overall drilled out recess profile, the method used to recess the hinge may be applied to a conventional rectangular shaped hinge to remove approximately 90% of the wood needed to recess the hinge. The remaining un-removed wood can then be removed conventionally using a chisel and mallet -reference Figure 11.

The drilled out recess hole depths will be equal to the thickness of the hinge used, this will typically be from I to 2 mm. Usually this amount of depth of cut may be achieved by careful use of the drill. Alternatively a simple variable depth gauge (as commonly found on domestic electric drills) may be used, reference Figure 7.

The shape of the spade drill used differs slightly from a conventional spade bit in that the main section of the drill bit cutting blade is horizontally ground @erpendicular to the drill shank) and it has a short shank and body. Conventional bits sometimes have a cutting edge shape which is slightly angled from the horizontal. A comparison between a typical bit and the bit recommended for this application is shown in Figure 8 (Figure Sb shows modified bit, Figure 8a shows conventional bit). As the depth of cut required will typically be no more than 2mm the drill bit required only needs a relatively short body depth, as compared to a conventional spade bit. The utilization of a drill bit having a shorter shank and body depth assists in ensuring that when boles are drilled the drill bit is more easily maintained at an approximate 90 degree position in relation to the wood being drilled. An additional benefit of utilizing a smaller length drill bit is that this better facilitates usage where access space is limited -reference Figure 9.

As an alternative to having centre hole locations pre-drilled into the hinge, a blank template matching the hinge profile (one half of hinge), and having centre location holes included, could be used. The template would be made of card or plastic or some other suitable inexpensive material -reference Figures lOa & lOb.

The location of screw fixing holes within the hinge are suitably positioned to avoid the small centre drill recesses created by the pointed centre portion of the spade drill -reference Figures 1 and 13.

The method used to drill each hinge recess would firstly require each marked hole position to be partially drilled using only the pointed centre portion of the spade drill bit, thus ensuring that when recesses are fully drilled to the hinge thickness depth the previously marked hole centre's remain clearly visible.

Claims (4)

1. Claims 1. The door or window hinge designs incorporate location holes to facilitate position marking of centre point drilling positions used to facilitate wood removal via an electric drill using an appropriate spade type drill bit, required to recess the hinge on a door, window, door frame or window frame.
2. 2. According to claim 1, the hinge designs may either have a shaped profile which matches the recess cut-out produced to mount the hinge or have a conventional rectangular shaped profile.
3. 3. According to claim 1, a template pre-drilled with centre hole positions, made from a tow cost material such as card or plastic, may be used as an alternative to the pre-drill centre marking holes incorporated into the hinge, to locate required drilling positions on a door, window, door frame or window frame.
4. 4. According to claim I, a modified spade drill may be used to facilitate wood removal.