NZ206322A

NZ206322A - Valve grinding tool with piston providing suction

Info

Publication number: NZ206322A
Application number: NZ20632283A
Authority: NZ
Inventors: A L Saunders
Original assignee: New Zealand Dev Finance
Priority date: 1983-11-18
Filing date: 1983-11-18
Publication date: 1986-11-12
Also published as: AU3523984A; GB2149713A; JPS6116274U; GB8428067D0; DE8433372U1

Description

206322 NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION AFTER PROVISIONAL NO: DATED: SUBSTITUTION OF APPLICANT ^ UfJCES SECTION 24 ve.\)ej-oPn£>jr aJ- M&w I, L&l 206322 18 November £§8W SUCTION TOOL JC(V\ dtp.

EC LAURENCE "SAUNDERS a New Zealand citizen of 53 Ballarat Street, E-llerslie, Auckland, New Zealand, do hereby declare the invention for which I pray that a patent may be granted to me and the method by which it is to be performed, to be particularly described in and by the following statement: 206322 This invention relates to a suction tool.

In the past, valve grinding on motor vehicle engines has been achieved with the assistance of a rod, typically wooden, with a rubber suction cap on one end with which the face of the engine valve can be gripped. Sometimes, however, the suction grip on the valve has proved to be insufficient, and the tool and the valve have come apart in the middle of the job.

It is an object of the present invention to provide a means of reducing the above difficulty. Alternatively, 1t is an object of the invention to provide a means by which one article can be securely attached by a suction grip to another.

Accordingly, 1n a first aspect, the present invention broadly consists in a valve grinding tool comprising a handle which may be gripped to rotate the tool and a valve which is engaged by it, a suction cap having a concave surface surrounded by an annular lip adapted to engage the surface of a valve, a chamber of variable volume located within the handle, a passageway connecting the concave surface to the chamber, and an operating means for expanding the chamber.

Preferably, the chamber comprises a piston and cylinder arrangement.

Preferably, the operating means comprises a movable part of the handle, said movable part being connected to a piston rod.

Preferably, the suction cap is formed of a resilient material.

Preferably, the suction cap is removable from the tool.

In a second aspect, the invention broadly consists in a suction tool comprising a resilient suction cap having a concave surface surrounded by an annular lip adapted to engage the surface of an article to be gripped, a piston chamber, a piston reciprocable within the chamber by means of a movable handle connected to a piston rod so as to be col linear with the chamber and the suction cap, and a passageway connecting the concave surface to the chamber.

HJZ. PATEKT OWKe i 2-7 A'JG j I !3C$r5? i The above gives a broad description of the present invention, a preferred form of which will now be described by way of example with reference to the accompanying drawings in which : Figure 1 : is a longitudinal sectional view of a first valve grinding tool of the present Invention.

Figure 2 : is a longitudinal sectional view of a second valve grinding tool of the present invention.

The illustrated tool of Figure 1 comprises a tubular body 2, adapted to serve as a handle, with a suction cap 3, typically of rubber or similar resilient material, attached at one end. The cap 3 is removable, and can be replaced with a cap 4 conveniently held at the other end of the tube 2. The cap 4 may be of a different size from the cap 3, as illustrated, or it can simply be a spare.

The cap 3 comprises a concave surface 5 surrounded by an annular lip 6. A passageway 9 connects the surface 5 with a chamber 10 within the body 2. One end of the chamber comprises an end surface 11 of a piston 12.

Connected to the piston is a piston rod 13, the other end of which is fixed to a pin 14 which extends out through a slot 15 in the wall of the tube 2- A sleeve 16 is fixed to the pin and surrounds the body 2. The sleeve acts as a movable part of the handle, which can be slid back and forth along the stationary tube 2 of the handle to move the piston towards and away from the cap 3 to expand and contract the chamber 10.

The rearward end of the slot 15 is provided with a docking slot 19, so that when the handle Is withdrawn as far as it will go, it can be twisted to lock it into position. 206322 ■).£ patent owtra ! 2 7 /V.!T ■«* The suction cap 3, chamber 10 and handle 2, 16 are all collinear.

The piston 1s typically provided with an 0-ring 20, 21 at each end", and an oil reservoir 22 between them, to ensure that there is no leak around the piston and that the piston can slide freely within the tube.

In use, the cap 3 is pressed against the the end face of an engine valve, and the movable part 16 of the handle is pulled back to expand the chamber and thereby increase the suction between the cap surface 5 and the surface of the valve. The slide 16 of the handle is then twisted to lock the pin 14 Into the slot 19, and the valve is then securely held. It can then be rotated against a grinding surface.

Figure 2 shows a similar valve grinding tool 30 which is preferably moulded from plastics components. An aperture 32 in a suction cap 31 communicates with the bore of cylinder 33 in which piston 34 and rod 35 can move.

The end 36 of the rod 35 is connected to a plunger 38 by a rotable connection 39. This is preferably achieved by snap-fit connection, as shown.

The plunger 38 has lugs 40 which can engage internal grooves 41 within cylinder 33, and when pulled away from the suction cap until the lugs escape the grooves 41, the plunger can be rotated so that the lugs engage shoulder 43 thereby preventing the piston from returning towards the suction cap.

I To release the valve, the handle is twisted back to return the pin 14 to the main slot 15, and then released to release the suction grip on the valve.

The invention may take many other different forms. For example, the piston arrangement illustrated may be replaced with a diaphragm or other form of variable-volume chamber. The invention may be employed in an article which is attached to a support surface or another article by means of sucker feet, to ensure that the suction grip is 206392 sufficient to hold 1t securely. The strength of the suction grip can be varied by varying the extent to which the chamber (10) can be expanded. 206322 ..J.. PATENT ~6" 2 7 AUG l?C6

Claims

WHAT WE CLAIM IS: R

1. A valve grinding tool comprising a handle which may be gripped to rotate Lho Lool and a valve which ia omjayod by it, a suction cap having a concave surface surrounded by an annular lip adapted to engage the surface of a valve, a chamber of a variable volume located within the handle, a passageway connecting the concave surface to the chamber, and an operating means for expanding the chamber.

2. A valve grinding tool as claimed in claim p., wherein the chamber comprises a piston and cylinder arrangement.

3. A valve grinding tool as claimed in claim 1 or 2, wherein the operating means comprises a movable part of the handle, said movable part being connected to a piston rod.

4. A valve grinding tool as claimed in 1, 2, or 3, wherein the suction cap is formed of a resilient material.

5. A valve grinding tool as claimed in any preceding claim, wherein the suction cap is removable from the tool.

6. A valve grinding tool as claimed in any preceding claim, wherein the suction cap, handle and chamber are all arranged col linearly.

7. A valve grinding tool, substantially as herein described with reference to any one of the accompanying drawings.

8. A suction tool comprising a resilient suction cap having a concave surface surrounded by an annular lip adapted to engage the surface of an article to be gripped, a piston chamber, a piston reciprocable within the chamber by means of a movable handle connected to a piston rod so as to be collinear with the chamber and the suction cap, and a passageway connecting the concave surface to the chamber. & CO. for the applicant FINANOp CORPORATION OF NEW ZEALAND