FR2654778A1 - Externally mechanically driven air compressor - Google Patents

Abstract

Externally mechanically driven air compressor characterised in that it is composed of a support (2) to be mounted on a portable electrical mechanical tool, of a drive shaft (12) with an eccentric (13) mechanically connected to a piston moving in a compression chamber (9) towards a discharge chamber (10) separated from the compression chamber by a wall (20) provided with a valve, the said piston being equipped on its front face with a flexible membrane (18) and traversed by a passage (21) provided with a compression valve (22). This invention is of interest to manufacturers of DIY equipment.

Description

 The present invention relates to an air compressor to be driven by an external driving force.

 DIY enthusiasts, for the most part, have a drill which is the basic tool essential for multiple jobs.

 This includes a tool holder chuck enclosing the drills, but also the shanks of various rotating tools such as milling machines, taps, pins ...

 In addition to its usual function, the drill has already been used as a rotary driving force in various applications such as: drain pump, agitators.

 Due to the limited power of this source, the effects and technical characteristics allow only limited performance.

 Thus, the compressor according to the invention is of small dimensions and is more particularly intended for do-it-yourselfers, model builders, model makers and others, for the execution of works requiring only compressed air at low pressure, for example 2 to 3 bars, such as painting, blowing, etc.

Of the various advantages conferred by the invention, the following main ones can be retained. easily transportable and inexpensive equipment. sufficient direct air flow for most tra
worth. independent driving force.

 The single figure is a schematic section of the various elements constituting the compressor according to the invention.

 The compressor according to the invention has a body 1 extended laterally by a support 2, for example a support to be mounted on the nose 3 of a power drill 4. This support comprises for example a plate 5 secured to a collar 6 allows t - its mounting and fixing to the nose 3 of id, drill 4 comprising a mandrel 7.

 The plate 5 is surmounted by a handle 8 of a shape suitable for holding and handling the assembly.

 Of course, various other types of power tools may be suitable. The case of a drill will be described below.

 The body 1 contains a compression chamber 9 and a discharge cavity 10. It laterally comprises a power take-off box 11 extending so as to be opposite the mandrel 7 of the drill.

 This housing keeps in rotation by appropriate bearings a drive shaft 12 clamped by the mandrel.

 Of course, there will be an adaptation to the different dimensions of the drills existing on the market.

 The drive axis 12 carries an eccentric 13 connected to a rod 14 of a piston 15 whose dimensions correspond to those of the compression chamber 9.

 The stroke of the piston corresponding to the offset of movement of the eccentric, the piston is crossed by a transverse passage closed by a valve 16 for filling the volume released by the withdrawal of the piston.

 The front face 17 of the piston is equipped or lined with a flexible membrane 18, for example of elastic material, the edges of which are integral with the lateral surface of the compression chamber making it possible to create an air volume 19 when the piston is withdrawn. .

 The reservoir cavity 10 and the compression chamber 9 are separated by a wall 20 comprising a passage 21 provided with a compression valve 22.

 The wall 20 is immobilized in the body 1 in a seat 23 provided with a seal 24.

 The reservoir chamber communicates with a hose 25 serving as a connection base for various flexible conduits for the distribution of compressed air.

 The compressor according to the invention can also be mounted on a jigsaw with various obvious adaptations.

 In this case, the eccentric is replaced by an appropriate support putting the piston in direct engagement with the blade movement.

 The invention has been described above in detail.

It is understood, however, that various simple modifications, additions, direct variants, substitutions by equivalent means fall within the scope of this protection.

Claims (4)

 1. Air compressor with external mechanical drive, characterized in that it consists of a support (2) to be mounted on a power tool, a drive shaft (12) with eccentric (13) connected mechanically with a piston moving in a compression chamber (9) towards a discharge chamber (10) separated from the compression chamber by a wall (20) provided with a valve, said piston being equipped on its front face with 'a flexible membrane (18) and is traversed by a passage (21) provided with a compression valve (22).  2. Air compressor according to claim 1, characterized in that the flexible membrane (18) occupies the entire section of the compression chamber (9).  3. Air compressor according to claims 1 and 2, characterized in that the support (2) is a support to be mounted on the nose of a power drill (4).  4. Air compressor according to claims 1 and 2, characterized in that the eccentric (13) is replaced by a support to be mounted on a jigsaw.