Cutlery – Cutting tools – Saw
Patent
1997-09-11
1999-09-07
Payer, Hwei-Siu
Cutlery
Cutting tools
Saw
279 30, 279 75, B23D 5110, B23B 3122
Patent
active
059468106
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention is based on a saber saw machine.
European Patent Disclosure EP 404 764 and U.S. Pat. No. 3,750,283 disclose saber saw machines in which the saw blade is clamped relatively reliably and is easy to remove and clamp in place again. The known embodiments have the disadvantage that the chucking device, for changing saw blades, has to be dealt with inconveniently near the saw blade, in other words with both hands: one hand introduces the saw blade while the other hand actuates the chucking mechanism and at the same time has to hold the machine. This presents the danger of injury from touching the sawteeth, because it is difficult when changing saw blades to firmly hold the saber saw securely at the same time.
To safely change saw blades, the saber saw machine must be clamped in a screw vise, for instance, or held on an underlying support or against the body, leaving both hands free to change the saw blade. This safe variant for changing saw blades is very time-consuming, however, and a chucking device for firmly holding the saber saw is not always available.
SUMMARY OF THE INVENTION
The saber saw machine according to the invention is provided with locking means which firmly hold a chucking tube relative to a reciprocating rod in a release position for the saw blade, and which by the insertion of the saw blade into the device releases the chucking tube again.
The saber saw machine with these features has the advantage over the prior art that the saw blade can be changed conveniently and quickly with only one hand, while with the other hand the machine can be securely held, without requiring a chucking device for holding the machine.
Because of the convenient, safe manipulation, the danger of injury when changing saw blades is reduced substantially. Moreover, the time expenditure for changing a saw blade is markedly less than in the known saber saw machines. As a result, particularly in the industrial field, higher productivity is attainable.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary longitudinal section through an exemplary embodiment of the saber saw of the engine;
FIG. 2 shows a longitudinal section of the device for chucking the saw blade;
FIG. 3 is a view rotated about its longitudinal axis compared to FIG. 2;
FIG. 4 shows an exemplary embodiment of a centering tube of FIGS. 2 and 3;
FIG. 5 shows an exemplary embodiment of a chucking tube;
FIG. 6 shows a further exemplary embodiment of a centering tube;
FIGS. 7 and 8 show two further exemplary embodiments of centering tubes, seen from below;
FIGS. 9, 10 and 11 show three exemplary embodiments of chucking tubes;
FIGS. 12, 13, 14 and 15 shows cross sections, each of two variants of pairs of reciprocating rods and centering tubes;
FIG. 16 shows a longitudinal section through a further exemplary embodiment of a chucking device;
FIG. 17 is a view of FIG. 16 from below;
FIG. 18 shows a longitudinal section through a further exemplary embodiment of a chucking device;
FIG. 19 is a cross section through the detent groove, as a detail of FIG. 18;
FIG. 20 is a view of FIG. 18 from below; and
FIGS. 21 and 22 shows a further exemplary embodiment of the chucking devices, in the form of a longitudinal section and cross section, respectively.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 shows a saber saw 10, with a machine housing 12 embodied as a handle and a gear housing 14, the housings being mounted on a base plate 16 by means of which the saber saw machine 10 is supported, in guidable fashion, on a workpiece that is not shown. A tubular reciprocating rod 18 emerging at the bottom from the gear housing 14 and having the reciprocating rod axis 19 carries a tubular device 20 on its lower end. This device is prestressed by a torsion spring 42 (FIG. 2) and serves to clamp or chuck a saw blade 22 that has a back 21 and a tooth side 23 and that passes through a V-shaped recess 24 in the base plate 16.
FIG. 2 shows a longitudinal section through an exemplary embodiment of the lower region of a reciprocating
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patent: 3750283 (1973-08-01), Hoffman
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patent: 4528753 (1985-07-01), Kuhlmann et al.
patent: 5306025 (1994-04-01), Langhoff
patent: 5573255 (1996-11-01), Salpaka
patent: 5575071 (1996-11-01), Phillips et al.
Di Nicolantonio Aldo
Gentinetta Rene
Hoelderlin Andreas
Payer Hwei-Siu
Robert & Bosch GmbH
Striker Michael J.
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