EP0225021A1 - Honing tool - Google Patents

Abstract

A honing tool which can be used on a standard machine, being adjustable by means of a graduated nut which engages a wedge and moves a honing stone assembly which is spring loaded to a larger or smaller diameter.

Description

• The purpose of this invention is to enlarge a round hole, making the same perfectly round, parallel and improve the surface finish. This process is generally known as honing.
• There are a number of honing tools on the market which consist mainly of a body, an abrasive material and a means of adjustment. These tools need a special purpose machine in order to operate. The design of the R.M.W. Honing System is such that it can be operated on a drill, lathe or any other standard machine incorporating a rotary spindle. The pressure on the abrasive material has, until now, been exerted by a wedge, forcing the abrasive material outwards - a process often causing a sieze up if too much pressure was applied.
• The design of the R.M.W. Honing System is such that this danger is avoided.
• The adjustment of the abrasive material is by a graduated nut.
• A specific embodiment of the invention will now be described by example, with reference to the accompanying drawing, in which:-
• Figure 1 shows in perspective the assembled R.M.W. Honing System.
• Figure 2 is a cross section a - a of Figure 1.
• Figure 3 shows the body.
• Figure 4 shows the wedge.
• Figure 5 shows the graduated nut.
• Figure 6 shows the mounted honing stone assembly.
• Figure 7 shows a cross section a - a of Figure 6.
• Figure 8 shows the spring.
• Referring to Figure 3 the body has a machined slot 1 the width of the mounted honing stone assembly Figure 6, a further slot 2, the width of the wedge, Figure 4; two crosspins 3 and 4, and a threaded section 5.
  The wedge Figure 4, has a taper, 6, identical to the taper on Figure 6 number 12. A key, 7, to receive the groove in the graduated nut Figure 5 number 9.
  The mounted honing stone assembly Figure 6 consists of the main boot, 10, which has a tapered slot, 12, which is the same taper as on wedge, Figure 4. The abrasive material - the honing stone, 11, is bonded to the boot.
• The operation of the R.M.W. Honing System will now be described. Referring to Figure 2 the spring Figure 8 presses against the honing stone assembly, Figure 6 which in turn presses against the tapered end of the wedge Figure 4, which is now firmly pressed against the pins 3 and 4, Figure 3. By turning the graduated nut Figure 5, in either direction the wedge Figure 4 will either retract or advance and allow the honing stone assembly to increase or decrease the diameter of the working section.

Claims (6)

1 A honing tool comprising a body having slots to fit the honing stone assembly and the wedge, a screw nut section, and two cross pins.

2 A honing tool as claimed in Claim 1 having a wedge with a taper on one side and a key or slot on the other to receive a graduated nut.

3 A honing tool as claimed in Claims 1 and 2 having a honing stone assembly with a tapered slot to correspond with the wedge.

4 A honing tool as claimed in Claims 1, 2 and 3 having a graduated nut to adjust the diameter of the honing stone assembly.

5 A honing tool as claimed in Claims 1, 2, 3, and 4 having a spring which spring loads the honing stone assembly.

6 A honing tool substantially as described herein with reference to Figures 1 - 8 of the accompanying drawing.

Images