US2993245A - Tools for injecting materials into wood - Google Patents

Description

July 25, 1961 s. H. REECE TOOLS FOR INJECTING MATERIALS INTO WOOD 2 Sheets-Sheet 1 Filed Nov. 24, 1958 HHIII Inventor ST NLEY f/f/vev REL-c5 Attor ey July 25, 1961 s, REECE 2,993,245

TOOLS FOR INJECTING MATERIALS INTO WOOD Filed Nov. 24, 1958 2 Sheets-Sheet 2 Fig.3

In ventor Sm/v1.5) HEN/er 1C J riw W Attorney United States Patent Ofiice Patented July 25, 1961 TOOLS FOR INJECTING MATERIALS INTO WOOD Stanley Henry Reece, Morden, England, assignor to Cobra (Wood Treatment) Limited, London, England,

a British company Filed Nov. 24, 1958, Ser. No. 776,070 Claims priority, application Great Britain June 14, 1958 2 Claims. (Cl. 21-73) This invention relates to tools for injecting materials into wood.

The material to be injected is usually a liquid or viscous antiseptic product but may be a colouring or fireproofing substance, and the tool is used for injecting, for example, wooden poles or trees.

According to the present invention, we provide in or for a tool for injecting materials into wood, an injection head comprising a cylinder for the material to be injected, a piston in the cylinder, and holders for two needles adapted to be fed from the cylinder upon needle penetration of the wood and operation of the piston by its contact under pressure with the wood surface.

An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a fragmentary front end elevation of the tool,

FIG. 2 is a side elevation corresponding to *FIG. 1,

FIG. 3 is an inverted plan view of FIG. 2, and

FIG. 4 is a fragmentary sectional view on the line IVIV of FIG. 1, and showing a needle.

Referring to the drawings, the tool head consists of a body member 5 formed with a cylindrical through hole 6 closed at one end, its rear end, by a removable screwthreaded cap 7, so as to form the cylinder of a piston and cylinder device, the cap 7 being screwed on to a screw-threaded spigot SA on the body member 5. The cylinder 6 has a liner 8 held in position by said cap 7 and a piston 9 is slidably mounted in the liner 8, the piston having a domed enlargement 9a and head 9b. The liner 8 projects beyond the front end of the cylinder 6 and a compression spring 10 (see FIG. 4) is provided around the piston and projecting portion of the liner 8 and at one end abuts the enlargement 9a and at its other end abuts the face of the body member 5 around the cylinder 6. The front or outer end of the liner 8 acts as a stop to determine the end of the inward or working stroke of the piston 9 and the projecting portion of the liner 8 prevents distortion of the compression spring 10.

A lug 1 1, FIG. 2, is provided on the piston head 9a and a guide rod 12 is fixed thereto. The rod 12 is slidably mounted on a pair of lugs 13, 14 fixed externally on the body 5 and a nut 15 is provided at the end of the rod 12 and acts as a stop to limit the return stroke of the piston when the nut 15 abuts the lug 14.

The cylinder 6 has two radially directed and circumferentially interspaced outlet ports -16, 17 in its peripheral wall and located at the inner end of the piston, and the liner 8 is, of course, similarly ported. The outlet ports 16, -17 open into two ducts 18, 19 which extend through the body member 5 parallel to the cylinder axis and at their outer or front ends open into tapped sockets 20, and an injector needle 21, FIG. 4, is screwed into each of said sockets. The cylinder 6 has a further port 22 communicating with a reservoir 23 and said port 22 is closed by the piston 9 on inward movement thereof. The domed enlargement 9a of the piston 9 lies behind the points of the needles in the inoperative position, and the relative position of the needles and piston head can be adjusted by adjustment of the guide rod aforesaid and/ or by screwing or unscrewing of the needles in their sockets. In the drawings, the piston is shown at the end of its working stroke.

The injection head is operated by levering it by a long handle, not shown, around a fulcrum point at a short distance from the head and supported by a collar or chain connecting the tool to, for example, a wooden pole. The needles are thus forcibly driven into the wood, and after they have penetrated a predetermined distance, the piston enlargement abuts the wood and is pushed inwards on further penetration of the needles to force the materials from the cylinder through the needles into the pole.

Modifications may be made without departing from the scope of the invention.

I claim:

1. In a tool having needles being forced into wood by a levering action and for injecting material into the wood comprising a body member, a reservoir for the injecting material connected to said body member, a cylinder closed at one end and arranged in said body member and communicating with said reservoir, a piston having a piston head on one end and an enlargement on the other end and arranged in said cylinder, spring means mounted around said piston between said body member and said enlargement to maintain said piston in a withdrawn inoperative position, stopping means arranged within said cylinder to stop said piston at the end of its operating stroke, two radially directed and circumferentially interspaced outlet ports connected to said cylinder at said closed end, two ducts communicating with said outlet ports extending through said body member parallel to the axis of said cylinder, said ducts opening into sockets, and two injector needles disposed in a horizontal plane and arranged in said sockets at the same end of said body member as said piston enlargement, said piston being operated to inject material into the wood by its contact with and upon penetration of said needles into the wood, the two needles and the axis of the piston forming a triangular configuration to aid uniform insertion of the needles into the wood and reduce stresses that arise upon use of the tool.

2. In a tool according to claim 1 in which said stopping means is a liner disposed within said cylinder and projects beyond one end of same.

References Cited in the file of this patent UNITED STATES PATENTS 955,422 Morin Apr. 19, 1919 1,661,595 Bowen Mar. 6, 1928 2,261,868 *Hecht Nov. 14, 1948 FOREIGN PATENTS 767,834 France July 25, 1934 429,370 Italy Ian. 24, 1948 614,579 Great Britain Dec. 17, 1948 677,364 Great Britain Apr. 13, 1952 177,252 Austria Jan. 11, 1954 935,501 Germany Nov. 24, 1955

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