US 2014/0331507 A1 · NOVEL JIG SAW

Abstract

A jig saw comprises a head (1), a motor, a first drive gear linked with a motor output end (3), and a first reciprocating lever (71) fixed with a first saw blade (101). The first drive gear is hinged with an end of a first connecting rod (61) in an upward eccentric manner, and the other end of the first connecting rod (61) is hinged with the first reciprocating lever (71). The jig saw further comprises a second drive gear linked with the motor output end (3). The second drive gear is hinged with an end of a second connecting rod (62) in an eccentric manner, and the other end of the second connecting rod (62) is hinged with a second reciprocating lever (72) that is fixed with a second saw blade (102). A linear limit mechanism that enables the first reciprocating lever (71) and the second reciprocating lever (72) to maintain a distance therebetween and be capable of linear motion is further disposed. The first saw blade (101) and the second saw blade (102) are respectively clamped on inner side surfaces close to each other at lower portions of the first reciprocating lever (71) and the second reciprocating lever (72). Directions of linear reciprocating motions of the first saw blade and the second saw blade are opposite. In the present invention, components are designed to be symmetrical, so that the jig saw runs stably, is easy to operate, and has high working efficiency.

Claims20

Dependent claims

1-10. (canceled)

A novel jig saw comprising a head, a motor disposed inside the head, a first transmission gear linked with a motor output end of the motor, a first connecting rod, and a first reciprocating lever fixed with a first saw blade;

the first transmission gear is eccentrically hinged with one end of the first connecting rod, while another end of the first connecting rod is hinged with the first reciprocating lever;
the novel jig saw is characterized in that:
the novel jig saw also comprises a second transmission gear linked with the motor output end (3), a second connecting rod, and a second reciprocating lever fixed with a second saw blade;
the second transmission gear is eccentrically hinged with one end of the second connecting rod, while another end of the second connecting rod is hinged with the second reciprocating lever;
a linear movement limiting mechanism is also provided to maintain linear movement of and a spacing between the first reciprocating lever and the second reciprocating lever;
the first saw blade is clamped at an inner side of a lower portion of the first reciprocating lever whereas the inner side of the lower portion of the first reciprocating lever is a side proximate to the second reciprocating lever;
the second saw blade is clamped at an inner side of a lower portion of the second reciprocating lever whereas the inner side of the lower portion of the second reciprocating lever is a side proximate to the first reciprocating lever;
linear reciprocal movement of the first saw blade and linear reciprocal movement of the second saw blade have mutually opposite moving directions.

5 more elements

Dependencies are inferred from the claim text.

Novel jig saw

Life of this patent

Novel jig saw

Life of this patent

Abstract

Claims20