GB2125721A

GB2125721A - A hand tool

Info

Publication number: GB2125721A
Application number: GB08220464A
Authority: GB
Inventors: Keith Lodge
Original assignee: Individual
Current assignee: Individual
Priority date: 1982-07-14
Filing date: 1982-07-14
Publication date: 1984-03-14
Also published as: GB2125721B

Abstract

A hand tool for clearing a glazing rebate of debris in preparation for reglazing comprises a cutting element 1 with mutually inclined cutting edges 4, 5 adapted to fit into the angle of the rebate. Guide means 11, 12 engage the glazing frame laterally of the rebate so as to limit penetration of the cutting element into the rebate. <IMAGE>

Description

SPECIFICATION A hand tool This invention relates to a hand tool for clearing a glazing rebate of debris in preparation for reglazing.

It is known to chip or scrape out glazing compound from a glazing rebate using a general purpose cutting tool such as a chisel. The inexpert use of such a tool causes problems in that the clearing operation is difficult and time-consuming and may also damage the glazing frame especially if this is of timber construction.

Accordingly, it is an object of the present invention to provide a hand tool for the purpose defined above in which the said problems are obviated or mitigated.

According to the present invention there is provided a hand tool for clearing a glazing rebate of debris in preparation for reglazing, comprising a cutting element with mutually inclined cutting edges adapted to fit into the angle of the rebate, and guide means for engaging the glazing frame laterally of the rebate so as to limit penetration of the cutting element into the rebate.

The invention will now be further described by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a side elevation of a first embodiment of hand tool according to the invention; Figure 2 is a corresponding plan view; Figure 3 is a side elevation of a second embodiment of hand tool according to the invention; and Figure 4 is a corresponding plan view.

Referring now to Figs. 1 and 2, the first embodiment of hand tool according to the invention comprises a cutting element 1 with a tang 2 fixed in a handle 3. The exposed end of the cutting element 1 has two cutting edges 4, 5 set at right angles to each other and meeting at a point 6. The body of the cutting element 1 is a V-section channel member with inclined sides 7, 8 meeting at a ridge 9. Each cutting edge 4, 5 makes an acute angle with the ridge 9. The two angles are equal. Above the ridge 9, rearwardly of the point 6, is a reaction member 10 integral with the handle 3.

Pivotally attached to the handle 3 at opposite sides of the reaction member 10 are guides 11, 12 from the upper edges of which project threaded studs 13, 14 extending through arcuate slots 15, 16 of a locking plate 17 fixed to the reaction member 10.

The studs 13, 14 are engaged by locking nuts 18, 19 which can be slackened to permit adjustment of the guides 11, 12 between the extreme positions shown in Fig. 2. Tightening of the locking nuts 18, 19 fixes the guides 11, 12 in their selected positions.

The end of the handle 3 remote from the cutting element 1 is enlarged to provide an anvil 20 for a hammer wielded by the user.

In use, the pivotal guides 11, 12 are set to suit the dimensions of the glazing rebate being cleared. Each guide 11, 12 contacts a respective outer face of the glazing frame flanking the rebate, such that the cutting element 1 is directed into and along the rebate with its point 6 fitting closely into the angle of the rebate and the cutting edges 4, 5 making superficial contact with respective sides of the rebate. If necessary, a small section of the rebate is cleared to enable the cutting element 1 to be held in this position in which the tool handle 3 will be angled out of the rebate. The handle 3 is held by the user in one hand while he strikes the anvil 20 with a hammer held in the other hand. The cutting element 1 is thus driven along the rebate to shear the glazing compound from the rebate without risk of gouging into the glazing frame.

The reaction member 10 supports the cutting element 1 against rearward flexure.

The second embodiment of hand tool according to the invention illustrated in Figs. 3 and 4 is adapted for power actuation by means of any one of the common types of portable hand-drill. Like parts carry the same reference numerals as in Figs. 1 and 2. The cutting element 1 is fixed to an actuating arm 21 which is pivotably mounted on the handle 3 at 22. The arm 21 is driven by a cam 23 on the end of a drive shaft 24 guided by a ball bearing 25 in the handle 3. The shaft 24 projects into a hollow part of the handle 3 having a lateral access opening 26. A clamping arm 27 is pushed to the end of the handle 3 and is fixed by means of a screw 28.

A compression spring 29 acts on the actuating arm 21 so as to effect return movement thereof.

In use, a drill is inserted into the hollow part of the handle 3 and clamped by means of the arm 27 and the screw 28. The drill chuck indicated in dotted line at 30 in Fig. 3 is engaged with the drive shaft 24, the chuck being tightened in conventional manner by means of a key inserted through the lateral opening 26. The guides 11. 12 are adjusted in the same way as described for the first embodiment in order to position the cutting element 1 in the rebate as before. The drill is then operated to drive the drive shaft 24 so rotating the cam 23 which with the return spring 29 causes rapid oscillation of the cutting element 1 thereby chipping or shearing the glazing compound from the rebate as the tool is moved along the rebate. The extreme positions of the cutting element 1 are shown in full and dotted lines respectively in Fig. 3.

The length of travel of the element 1 is very short, e.g. about 3mm.

In both embodiments the cutting element 1 may be replaced if necessary as a result of wear. It is also possible to provide an integral cutting element 1.

It will be appreciated that numerous modifications may be made without departing from the scope of the invention. For example, the reaction member 10 may be provided with a nose guide which extends to the left as seen in the drawings and is adapted to enter into the glazing rebate for sliding contact with the rebate floor in trailing relationship with the cutting element 1, so ensuring that the cutting element 1 is correctly angled when both the point 6 thereof and the nose are properly engaged in the rebate.

In a further modification the acute angles between the ridge 9 and the respective cutting edges 4, 5 is unequal. The resultant asymmetry of the cutting element may give improved results in certain circumstances.

In a modification of the second embodiment shown in Figs. 3 and 4, the tool is provided with an integral power unit for operating the drive mechanism of the cutting element 1.

Claims

1. A hand tool for clearing a glazing rebate of debris in preparation for reglazing, comprising a cutting element with mutually inclined cutting edges adapted to fit into the angle of the rebate, and guide means for engaging the glazing frame laterally of the rebate so as to limit penetration of the cutting element into the rebate.

2. A hand tool as claimed in claim 1, wherein the cutting edges are provided at the end of a V-section channel member with inclined sides meeting at a ridge.

3. A hand tool as claimed in claim 2, wherein the cutting edges are inclined at ninety degrees to each other and at equal acute angles to the ridge.

4. A hand tool as claimed in any one of the preceding claims, wherein the cutting element is fixed in a handle adapted to be struck with a hammer for manual operation of the tool.

5. A.hand tool as claimed in any one of claims 1 to 3, wherein the cutting element is attached to an actuating mechanism adapted to be operated by a portable hand-drill so as to impart an oscillating motion to the cutting element.

6. A hand tool as claimed in claim 5, wherein the actuating mechanism comprises a pivotal arm engaged by a rotary cam for deflecting the arm against the force of a return spring, the cutting element being attached to said arm.

7. A hand tool as claimed in claim 6, wherein the handle has a socket for receiving the head of the hand-drill and a drive shaft of said cam extends into said socket for engagement by a chuck of the drill head.

8. A hand tool as claimed in any one of the preceding claims, wherein the guide means comprise two guide elements pivotally mounted in flanking relationship with the cutting element and lockable in selected pivotal positions suitable for different dimensions of glazing rebate.

9. A hand tool for clearing a glazing rebate of debris in preparation for reglazing, substantially as herein described with reference to and as illustrated in Figs. 1 and 2 or Figs. 3 and 4 of the accompanying drawings.