Cutlery – Cutting tools – Saw
Reexamination Certificate
1999-12-21
2001-09-04
Ashley, Boyer (Department: 3724)
Cutlery
Cutting tools
Saw
C030S393000, C030S394000
Reexamination Certificate
active
06282797
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention generally relates to a saber saw. This invention particularly relates to a cutting mechanism in a saber saw.
2. Description of the Related Art
Saber saws are basically of first and second types. In a saber saw of the first type, a saw blade is reciprocated along a linear path. In a saber saw of the second type, a saw blade is moved along an orbital path, for example, an elliptical path. The second type is also referred to as the orbital cutting type.
Prior-art saber saws of the orbital cutting type can not operate properly if saw blades are inversely attached to plungers or carriers.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a saber saw of the orbital cutting type which can operate properly even when a saw blade is inversely attached to a plunger or a carrier.
A first aspect of this invention provides a saber saw comprising a housing; a motor contained in the housing; a second shaft rotatably connected to the housing and being rotated by the motor; a plunger connected to the housing for holding a saw blade, the plunger being free to reciprocate; a motion converting mechanism provided between the second shaft and the plunger for converting rotation of the second shaft into reciprocation of the plunger; a guide member connected to the housing and having a track surface; and means for moving the plunger along the track surface of the guide member during reciprocation of the plunger.
A second aspect of this invention is based on the first aspect thereof, and provides a saber saw wherein the guide member comprises a first sub guide member having a first sub track surface and a second sub guide member having a second sub track surface, and the moving means comprises a roller shaft connected to the plunger and extending through the plunger in a direction perpendicular to a direction of reciprocation of the plunger, and rollers connected to two ends of the roller shaft respectively, and contacting with and moving along the first and second sub track surfaces respectively during reciprocation of the plunger.
A third aspect of this invention provides a saber saw comprising a housing; a motor contained in the housing; a second shaft rotatably connected to the housing and being rotated by the motor; a plunger connected to the housing for holding a saw blade, the plunger being free to reciprocate; a guide sleeve connected to the housing and supporting the plunger, the guide sleeve being movable in a direction substantially perpendicular to a direction of reciprocation of the plunger; a motion converting mechanism provided between the second shaft and the plunger for converting rotation of the second shaft into reciprocation of the plunger; guide members connected to the housing and having track surfaces respectively; a roller shaft connected to a rear portion of the plunger and extending through the rear portion of the plunger in a direction perpendicular to a direction of reciprocation of the plunger, the roller shaft extending through the guide sleeve; and rollers connected to two ends of the roller shaft respectively, and contacting with and moving along the track surfaces of the guide members respectively during reciprocation of the plunger.
A fourth aspect of this invention is based on the first aspect thereof, and provides a saber saw wherein the guide member comprises an upper guide member and a lower guide member.
A fifth aspect of this invention is based on the fourth aspect thereof, and provides a saber saw wherein an end of the upper guide member and an end of the lower guide member are connected to each other.
A sixth aspect of this invention is based on the first aspect thereof, and provides a saber saw wherein the housing comprises an inner cover and a gear cover, and the guide member is firmly held between the inner cover and the gear cover.
A seventh aspect of this invention is based on the third aspect thereof, and provides a saber saw wherein the guide sleeve has an elongate hole extending along the direction of reciprocation of the plunger, and the roller shaft extends through the elongate hole in the guide member, and wherein a height dimension of the elongate hole is slightly greater than a diameter of the roller shaft.
An eighth aspect of this invention is based on the first aspect thereof, and provides a saber saw wherein the track surface of the guide member has one of a saw-toothed shape and a waveform.
A ninth aspect of this invention is based on the fourth aspect thereof, and provides a saber saw wherein a shape of a track surface of the upper guide member and a shape of a track surface of the lower guide member are different from each other.
A tenth aspect of this invention is based on the third aspect thereof, and provides a saber saw wherein each of the guide members comprises an upper guide member and a lower guide member.
An eleventh aspect of this invention is based on the tenth aspect thereof, and provides a saber saw wherein an end of the upper guide member and an end of the lower guide member are connected to each other.
A twelfth aspect of this invention is based on the third aspect thereof, and provides a saber saw wherein the housing comprises an inner cover and a gear cover, and the guide members are firmly held between the inner cover and the gear cover.
A thirteenth aspect of this invention is based on the third aspect thereof, and provides a saber saw wherein the track surfaces of the guide members have one of a saw-toothed shape and a waveform.
A fourteenth aspect of this invention is based on the tenth aspect thereof, and provides a saber saw wherein a shape of a track surface of the upper guide member and a shape of a track surface of the lower guide member are different from each other.
A fifteenth aspect of this invention provides a saber saw comprising a plunger for holding a saw blade; means for reciprocating the plunger along an axis of the plunger; an engagement member connected to the plunger; and first and second guide members having first and second engagement surfaces respectively, the first and second engagement surfaces angularly deviating from the axis of the plunger; wherein the engagement member contacts with and moves along either the first engagement surface of the first guide member or the second engagement surface of the second guide member during reciprocation of the plunger.
A sixteenth aspect of this invention is based on the fifteenth aspect thereof, and provides a saber saw wherein the engagement member comprises a roller.
A seventeenth aspect of this invention is based on the fifteenth aspect thereof, and provides a saber saw wherein the engagement member is located between the first and second engagement surfaces of the first and second guide members.
An eighteenth aspect of this invention provides a saber saw comprising a plunger for holding a saw blade; means for reciprocating the plunger along an axis of the plunger; first and second engagement members connected to the plunger; and first and second guide members having first and second engagement surfaces respectively, the first and second engagement surfaces angularly deviating from the axis of the plunger; wherein the first engagement member contacts with and moves along the first engagement surface of the first guide member so that the first engagement member and the first guide member are active during reciprocation of the plunger in a first mode of saber saw operation, and the second engagement member contacts with and moves along the second engagement surface of the second guide member so that the second engagement member and the second guide member are active during reciprocation of the plunger in a second mode of saber saw operation which differs from the first mode.
REFERENCES:
patent: 3269197 (1966-08-01), Enders
patent: 3461732 (1969-08-01), Gregory
patent: 3802079 (1974-04-01), Ketchpel, Jr. et al.
patent: 3945120 (1976-03-01), Ritz
patent: 4628605 (1986-12-01), Clowers
patent: 5402580 (1995-04-01), Seto et al.
patent: 5479711 (1996-01-01), Hathcock
patent
Osada Yoshio
Tachibana Toshihiko
Ashley Boyer
Hitachi Koki Co,. Ltd.
Woo Louis
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