Removable adapter for air and fuel intake and mixing in a combustion tool

Abstract

According to the invention, the adapter is arranged to be mounted in the tool, to be connected to a fuel cartridge and to receive fuel and communicate with a combustion chamber so as to inject a mixture of external air and fuel therein.

Claims

1. A removable adapter, the removable adapter configured for external air and fuel intake and mixing, the removable adapter being for an internal combustion fixing tool comprising a combustion chamber, the combustion chamber arranged to be mounted in the tool, the combustion chamber configured to be connected to a fuel cartridge and to receive fuel and a mixture of external air, both of which are injected therein, wherein the adapter is configured such that the adapter has a longitudinal axis that extends in a different direction than a longitudinal direction of the fixing tool and a longitudinal direction of the fuel cartridge, wherein an outlet channel extending between an outlet of the adapter and an external air inlet forming a venturi is provided, being arranged to drive external air admitted in the adapter and mix it with the fuel.

2. The adapter according to claim 1, wherein an air intake manifold is provided for bringing external air in the combustion chamber of the tool and a fuel pathway for bringing fuel from the fuel cartridge to the combustion chamber.

3. The adapter according to claim 1, further comprising a fuel dosing device.

4. The adapter according to claim 1, further comprising a fuel filtering device.

5. The adapter according to claim 1, further comprising an air filtering device.

6. The adapter according to claim 1, wherein the adapter is mounted directly to the fuel cartridge.

7. The tool according to claim 1, wherein the adapter is housed within the tool.

8. The adapter according to claim 1, wherein the venturi is provided, being arranged to drive external air admitted in the adapter and mix it with the fuel under an effect of an introduction of the fuel.

9. The adapter according to claim 1, wherein the venturi is provided, being arranged to drive external air admitted in the adapter and mix it with the fuel upon the intake of the fuel.

Description

(1) The invention will be better understood with the help of the following description of an internal combustion fixing tool, comprising an adapter according to the invention, referring to the accompanying drawing, wherein:

(2) FIG. 1 is a partial section view with, in the housing thereof, a fuel cartridge and an adapter according to the invention, out of operation, and

(3) FIG. 2 is a view similar to FIG. 1, the adapter being in operation and distributing, in the combustion chamber, a mixture of external air and fuel.

(4) The tool represented on the drawing is here a manual operation tool and comprises, in a casing 1, extended by an operation handle 2, a cylinder 3, in which a propelling piston 4 can be driven in movement to drive here a nail into a support material, a combustion chamber 5, a housing 6 for reception of a fuel cartridge and in which a cartridge 7 is housed, and a housing 8 for reception of an external air and fuel intake and mixing adapter of the cartridge 7 and in which an adapter 9 is housed.

(5) Apart from the housing of the adapter and of the adapter itself, the tool is perfectly known from the man of the art.

(6) The rear part of the casing 1, not represented, comprises external air intake louvers that could be plugged upon firings. In the example being considered, a fan 10 is provided in the combustion chamber 5, the rotation driving of which is ensured by a motor 11. A spark plug 12 allows the mixture in the chamber 5 to be fired.

(7) The fuel cartridge 7 comprises a fuel ejection tip 13 which is mounted on a spring and, when this tip is pushed against the action of such spring, fuel can escape from the cartridge.

(8) The adapter 9 comprises an intake orifice 14 for receiving the cartridge tip 13.

(9) The adapter 9, in an operating position, is thereby fitted on the tip 13 in an ejection position. Thus, the adapter can be mounted directly on the cartridge 7. The adapter 9 is configured such that the adapter 9 has a longitudinal axis 23 that extends in a different direction than a longitudinal direction of the fixing tool and a longitudinal direction of the fuel cartridge 7.

(10) However, the adapter here comprises a dosing valve 18 on the fuel pathway 15, between the intake orifice 14 and the outlet 16 of the adapter. The valve, so as to be able to supply one dose of fuel, is controlled generally by abutting the tool against the part to be fastened. The control, through an operating trigger 17 arranged in the handle 2 of the tool, can be possible. A filter 19 is arranged in the intake orifice 14 of the adapter, upstream from the valve 18.

(11) The fuel pathway 15, downstream from the valve 18, opens into an outlet channel 20 extending between the outlet 16 and an external air inlet 21, a channel in which the mixture of fuel and external air is performed. The outlet channel 20 extending between the outlet 16 and the external air inlet 21 forms a venturi 24. An air filter 22 is arranged at the air inlet 21 of the mixing channel 20, the inlet of which operates as an air manifold. The outlet 16 of the channel 20 opens directly into the combustion chamber 5.

(12) Due to the removable character of the adapter 9, it can be easily replaced by another completely new one providing characteristics being advantageous for an optimum operation of the tool.