Pumps – Motor driven – Electric or magnetic motor
Patent
1996-01-22
1997-06-17
Thorpe, Timothy
Pumps
Motor driven
Electric or magnetic motor
417234, 417415, 417462, 74 49, F04B 3504, F04B 5316
Patent
active
056392265
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a portable, battery operated air pump, preferably for bicycles, and comprising a battery power supply for a motor which, through a wheel assembly, activates a pump mechanism which is connected to an air nozzle intended for engagement with an air valve in the object to be inflated.
BACKGROUND ART
A desire exists for a pump of the above-mentioned type which is compact and which may be brought on bicycles, on camping trips and for other purposes. Pumps of the above type are known from e.g. U.S. Pat. No. 5,127,808. Even though this known pump is rather compact and is able to be brought for use independent of an external power supply, it has a radial dimension which is relatively large. Thus the orientation of the toothed wheel about an axis being parallel with the longitudinal axis of the pump contributes to the relatively large radial dimension of the pump. Moreover, the pump is disadvantageous in that it is rather complicated and consists of a large number of specialized individual parts. Moreover, the pump is disadvantageous as it may not be used for one hand operation. Thus the nozzle is affixed to the compressor of the pump through a flexible air hose.
DISCLOSURE OF THE INVENTION
It is the object of the present invention to provide a pump of the above-mentioned type and which overcomes the disadvantages associated with the known pump, in that it is made of mechanically simple elements and may be operated by one hand only.
According to the present invention this is obtained with a pump characterized in that the elements are arranged end to end in order to provide an elongated flat unit having a tapering end. The pump mechanism consists of a cylinder/piston pump which is pivotally supported in the tapering end and the end of the cylinder is arranged opposite the piston rod. The piston pump is arranged for pivoting around a pivot axis extending substantially perpendicular to a longitudinal axis through the air pump. The nozzle is mounted directly onto the cylinder and is concentric about said pivot axis. The piston rod is rotatably supported near the circumference of a driven wheel which rotates about an axis parallel with the pivot axis and which, together with a small driving wheel, constitute the above-noted wheel assembly. The pinion rotates about an axis parallel to the longitudinal axis of the pump.
Since the elements constitute an elongated and preferably tapering unit, the nozzle arranged at the tapering end may easily be brought into contact with an air valve, e.g. for a wheel on a bicycle. The pump may be held and activated by one hand. The switching means of the pump will preferably be intended for operation by the user's thumb which simultaneously presses the nozzle against the valve. The cylinder/piston pump is a mechanically simple and inexpensive unit. As the cylinder is pivotally supported about an axis being common with the nozzle, it is possible to make the tapering end very narrow whereby the use is made easier. Moreover, the structure is mechanically simple, as it is possible optionally to affix the nozzle directly onto the cylinder or on a housing in which the elements of the pump are contained. The limited pivotal rotation of the nozzle will be absorbed either by a rubber sleeve in the nozzle or by a flexible tube connecting the nozzle and the cylinder.
The use of a connecting rod type movement, which is established by the activation of the piston rod by the rotating driven wheel, is mechanically simple and reliable. Advantageously, the wheel assembly may consist of toothed wheels, however, it may also consist of friction wheels 10a and 13a (See FIG. 5). When toothed wheels are used they might be of the type which function according to the principle as a crown wheel and a driving pinion. At the backside of the driven wheel it is possible, with due regard to the stability, to arrange a roller opposite the driving friction wheel or the driving pinion.
BRIEF DESCRIPTION OF THE DRAWINGS
Other embodiments will occur from the independ
REFERENCES:
patent: 882099 (1908-03-01), Daffrin
patent: 1224849 (1917-05-01), Butler et al.
patent: 1414573 (1922-05-01), Krehlik
patent: 4874296 (1989-10-01), Moynihan
patent: 5127808 (1992-07-01), Nichols et al.
Boutrup Morten
Sorensen Peter Eglund
McAndrews, Jr. Roland G.
Thorpe Timothy
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