Pumps – Motor driven – Pump and motor interconnected by endless flexible...
Patent
1981-03-14
1983-08-09
Smith, Leonard E.
Pumps
Motor driven
Pump and motor interconnected by endless flexible...
417415, 92 84, 92137, 74 49, F04B 902
Patent
active
043976166
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to pump driving mechanisms and, more particularly, to a pump driving mechanism wherein a piston body provided with a shaft bearing part for a driving source is supported through elastic legs and the driving source is connected to the shaft bearing part to convert motions of the driving source to reciprocating motions.
BACKGROUND ART
Generally, in the pump driving mechanism, a pure reciprocating motion must be given to a piston to prevent water leakage and a contrivance to achieve that motion, such as a crank connection is required.
Therefore, in such conventional pump driving mechanisms as the one which has been adopted in a water feeding device 70 of, for example, FIG. 15, a driving force of an output shaft 72 of an electric motor 71 for a pump is transmitted to a driving gear 74 through a gear 73. An eccentric rotary motion of an eccentric pin 75 provided to project on the driving gear 74 is converted to a reciprocating motion through a slider 76 and piston joint 77, and a piston 78 is correctly driven to reciprocate within a cylinder 79. In such mechanism, however, a large noise has been generated when it is driven and the energy loss has been large for the following reasons. That is, there are seven places in which the respective elements slide in contact with each other, namely, between the eccentric pin 75 and the slider 76, between the slider 76 and the piston joint 77, between the piston joint 77 and the driving gear 74, between the slider 76 and the driving gear 74, between a piston rod 80 and a shaft bearing 81, between the gear 73 and the driving gear 74 and between the driving gear 74 and a reduction gear shaft 82 and the noise has been large.
DISCLOSURE OF THE INVENTION
Therefore, a first object of the present invention is to provide a pump driving mechanism wherein the sliding contacts are few and the noise upon the driving is low.
A second object of the present invention is to provide a pump driving mechanism wherein the size of the mechanism is minimized and the driving load is reduced.
A third object of the present invention is to provide a pump driving mechanism wherein vertical motions and rolling motions of the piston body in the reciprocating motion are prevented and any deterioration in performances due to a generation of clearance between the pison and the cylinder is prevented.
A fourth object of the present invention is to provide a pump driving mechanism of a thin type.
Other objects of the present invention will be gradually made clear by the following explanations with reference to embodiments.
Accordingly, in the present invention, a piston body is supported between respective free ends of a pair of elastic leg pieces fixed at one end and made free at the other end, a piston rod and shaft bearing part are formed in said piston body, an eccentric shaft driven to be rotated by a motor is connected to the shaft bearing part and the piston body is reciprocated, to thereby solve the foregoing conventional problems.
Further, in the present invention, the pair of elastic leg pieces are formed of U-shaped bent pieces and a substantial length of the elastic leg piece is secured within a limited space to attain the foregoing second object; the pair of U-shaped elastic leg pieces are folded back at half the entire length so as to cancel the rolling of the piston body by the both folded back pieces and to thereby provide a pure reciprocating motion to the piston body and attain the second and third objects; the pair of elastic leg pieces are connected with each other through connecting pieces and any nonuniform deflections of the respective elastic legs are eliminated to thereby attain the third object; an elastic arm movable in directions vertical to reciprocating directions of the piston body is provided with a shaft bearing and an eccentric shaft is inserted into the shaft bearing so that motions of the eccentric shaft in the direction intersecting at right angles the reciprocating motions of the piston will be absorbed by rocking motions of
REFERENCES:
patent: 3187674 (1965-06-01), Hammelmann
patent: 3365796 (1968-01-01), Tolmie et al.
patent: 3425410 (1969-02-01), Cammack
patent: 3714711 (1973-02-01), Daniels
patent: 3776667 (1973-12-01), Berglund et al.
patent: 4030573 (1977-06-01), Buzzi et al.
patent: 4065977 (1978-01-01), Buzzi et al.
patent: 4167060 (1979-09-01), Sakamoto
patent: 4312126 (1982-01-01), Rochelt
Tanabe Toshio
Yasunaka Shinsaku
Matsushita Electric & Works Ltd.
Smith Leonard E.
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