A novel reciprocating saw, comprising a handle (1), a switch (2), a power line (3), a motor (4), a left casing (5) and a right casing (6), and further comprising a first saw blade (8), a second saw blade (9), an upper support (10), a lower support (11), and, provided between the upper support (10) and the lower support (11), an upper gear (12), a first eccentric shaft (13), a first drive arm (14), a lower gear (15), a second eccentric shaft (16) and a second drive arm (17). Many of the parts of the reciprocating saw are universal, and many of the mounting surfaces are machined in place by a machining center directly on an aluminum (or magnesium alloy) casting, reducing the number and type of assembled parts. In addition, machining factors are taken into account upon designing such that machining of all mounting surfaces can be completed in a single set up. Moreover, the first drive arm and the second drive arm are directly driven by a pair of spiral bevel gears, reducing a loss of efficiency caused by a two-stage or multi-stage drive. The present invention reduces the length of the reciprocating saw and simplifies assembly to provide a more compact structure, lower weight, and significantly reduced overall manufacturing cost.
B23D 49/10 - Dispositifs de sciage tenus à la main ou entraînés manuellement à lames droites tenues à leurs deux extrémités
B23D 51/16 - Machines à scier ou dispositifs de sciage à lames droites, caractérisés uniquement par la structure d'organes particuliersMoyens de support ou d'attache des outils qui, couverts par le présente sous-classe, sont fixés à leur monture à leurs deux extrémités de l'entraînement ou des mécanismes d'avance des outils droits, p. ex. des lames de scies, des archets
B25F 5/00 - Détails ou parties constitutives d'outils portatifs à moteur sans relation spécifique avec les opérations exécutées et non prévus ailleurs
A double-saw-blade reciprocating saw, comprising a shell (1), a first reciprocating rod (5) and a second reciprocating rod (6) that are distributed up and down, guide rails (3) fitted in the first reciprocating rod (5) and the second reciprocating rod (6), and a motor (4), a transmission mechanism (7) and a saw blade clamping mechanism (8) that are arranged in the shell (1). The motor (4) is disposed on the upper portion or the lower portion of the transmission mechanism and provides a power source for the transmission mechanism. The transmission mechanism drives the first reciprocating rod (5) and the second reciprocating rod (6) to do linear reciprocating motion. The front end of the first reciprocating rod (5) and the front end of the second reciprocating rod (6) are respectively connected to a first saw blade (18) and a second saw blade (19) that are disposed on the saw blade clamping mechanism. The overall length of the double-saw-blade reciprocating saw is reduced, and therefore the double-saw-blade reciprocating saw is suitable for being operated and used in narrow and small space and also suitable for single-hand operation; and the saw blade clamping mechanism is used for positioning a gap between the two saw blades, and the effect of preventing the two saw blades from deviating is achieved.
B23D 51/10 - Machines à scier ou dispositifs de sciage à lames droites, caractérisés uniquement par la structure d'organes particuliersMoyens de support ou d'attache des outils qui, couverts par le présente sous-classe, sont fixés à leur monture à leurs deux extrémités des dispositifs pour monter les lames droites ou d'autres outils pour des dispositifs tenus à la main ou entraînés manuellement
3.
SAW-BLADE STRUCTURE OF DOUBLE SAW-BLADE CUTTING MACHINE
A saw-blade structure of a double saw-blade cutting machine, wherein each saw-blade comprises a saw-blade body (1) and saw teeth (2), with the saw-blade body (1) of at least one saw-blade having several bosses (3) arranged at intervals near the root of the saw teeth (2) on the surface corresponding to another saw-blade. The arrangement of a plurality of bosses (3) at intervals near the root of the saw teeth of the saw-blade enables the heat produced by the friction between the bosses and the corresponding saw-blade when the double saw-blade cutting machine is working to dissipate by means of the intervals therebetween, avoiding deformation of the saw-blade and the forking of the saw kerf caused by overheating, thus prolonging the service life of the saw-blade.
A lig 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 lig 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 lig saw runs stably, is easy to operate, and has high working efficiency.
B23D 51/16 - Machines à scier ou dispositifs de sciage à lames droites, caractérisés uniquement par la structure d'organes particuliersMoyens de support ou d'attache des outils qui, couverts par le présente sous-classe, sont fixés à leur monture à leurs deux extrémités de l'entraînement ou des mécanismes d'avance des outils droits, p. ex. des lames de scies, des archets
B23D 51/08 - Machines à scier ou dispositifs de sciage à lames droites, caractérisés uniquement par la structure d'organes particuliersMoyens de support ou d'attache des outils qui, couverts par le présente sous-classe, sont fixés à leur monture à leurs deux extrémités des dispositifs pour monter les lames droites ou d'autres outils
A dual-saw blade cutting machine, which is improved on the original basis of an inner saw blade, an outer saw blade (A, B), a small output shaft, a big output shaft (32, 31), a first gear, a second gear (33, 34), and a driving gear shaft (35); also comprising a first annular groove (321) and a second annular groove (322) which are located between the first gear and the second gear (33, 34) on the small output shaft (32). The first annular groove (321)is provided therein with a first snap spring (C) abutting against a fifth bearing (8), and the second annular groove (322) is provided therein with a second snap spring (D). At the same time, the small output shaft (32) is provided thereon with an elastic piece (10) which is hogged towards the side of the second snap spring (D) and the two ends thereof respectively abut against the second gear (34) and the second snap spring (D). The cutting machine has the following advantages: it can prevent the small output shaft from stretching out and drawing back, absorb manufacturing tolerances accumulated by each component, enable the small output shaft to have a pre-tightening force along the axial direction, so as to ensure the conformability of the axial positions of the two shafts, enable the inner saw blade to have a limited space to slide between left and right, and ensure the two saw blades always have an appropriate relative clearance between each other, so as to perform the cutting operation smoothly and reliably.
B23D 45/10 - Machines à scier ou dispositifs de sciage à lames circulaires ou à disques à friction à plusieurs lames circulaires
B23D 47/00 - Machines à scier ou dispositifs de sciage travaillant au moyen de lames circulaires, caractérisés uniquement par la structure d'organes particuliers
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