Cutting – By tool reciprocable along elongated edge – With tool in-feed
Reexamination Certificate
1999-08-04
2001-09-18
Rada, Rinaldi I. (Department: 3724)
Cutting
By tool reciprocable along elongated edge
With tool in-feed
C083S766000, C083S767000
Reexamination Certificate
active
06289779
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to a sawing machine, and more particularly to a carpenter's sawing machine capable of sawing in a horizontal direction and a longitudinal direction.
BACKGROUND OF THE INVENTION
A carpenter's sawing machine disclosed in the Taiwan Pat. 215,621 comprises a base which is provided with a long frame body fastened pivotally therewith. The frame body is provided in two sides thereof with a fastening seat which is in turn provided at the top thereof with two slide rods fastened uprightly therewith. The slide rods are intended to hold a hacksaw. The base is provided at the top thereof with a sectoral recess extending outward at an angle of 90 degrees. The sectoral recess is provided thereon with an angle graduation and in the bottom thereof with a locating hole opposite to the angle cutting line. Located oppositely to the locating hole is an urging rod and a curved rod which is fastened pivotally with the urging rod. The frame body is further provided in the lower end thereof with a pivot serving as a pivoting point of the curved rod, and a spring for confining the curved rod.
The long frame body is provided at both ends thereof with a round shaft sleeve which is provided in the center thereof with a recess of a predetermined depth. The recess is provided with an expanded opening. The recess is further provided in the periphery thereof with a plurality of locating holes. The fastening seat is engaged with a C-shaped ring of the shaft sleeve. The inner diameter of the fastening seat is corresponding to the outer diameter of the shaft sleeve such that their axes are aligned with the cutting bottom line of the hacksaw. The locating hole is further provided with a plurality of locating pin holes in which a locating pin and a spring are disposed pivotally.
As shown in
FIG. 1
, the hacksaw is provided with a body
10
which is provided at one end thereof with a grip
11
, and at other end thereof with an insertion portion
12
for fastening one end of a blade
13
. The blade
13
is fastened at other end thereof with the grip
11
by a screw
14
.
The prior art sawing machine described above has several drawbacks, which are explicitly described hereinafter.
The curved rod is used to adjust the horizontal cutting angle of the workpiece. The curved rod is engaged in the radial displacement, which is different from the horizontal adjustment of the long frame body. The radial motion is prone to cause the overturn of the whole set of structure and is inconsistent with the inertia motion of the mechanics of the human body.
The longitudinal cutting angle of the workpiece is changed mainly by the outer diametrical rotation of the fastening seat. The shaft sleeve and the fastening seat are pivoted by the locating hole and the locating pin in conjunction with the spring. It requires a precision technique to form a vertical hole along the radial direction in view of the locating hole and the locating being disposed respectively at the radial positions of the shaft sleeve and the fastening seat. As a result, the sawing machine of the prior art is not cost-effective.
The body
10
, the insertion portion
12
, the grip
11
, and the blade
13
are fastened in a “single point” manner such that the blade
13
is prone to become loosened to result in a sawing work of a poor quality.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a carpenter's sawing machine, which comprises a base which is provided with a long support body. The base is provided at the top thereof with a sectoral recess of an angle of 90 degrees and extending outwards from the pivoting place of the long support body. The sectoral recess is provided with a angle graduation in cooperation with a pointer of the long support body. The long support body is provided at one end thereof with a round urging portion which is provided radially with a dividing head seat. The urging portion and the dividing head seat are provided with a recessed portion. The dividing heat seat is provided axially with a fastening hole. An adjustment seat is provided such that the adjustment seat is opposite to the urging portion and the dividing head seat. The adjustment seat can be fitted over the dividing head seat such that the adjustment seat is joined with the C-shaped ring of the urging portion. The C-shaped opening is provided with a straight rod for fastening the hacksaw. The adjustment seat is provided axially with the graduation. The adjustment seat is provided with a fastening hole in which a ball and a spring are disposed. The ball and the spring are confined by a screw. The adjustment seat cooperates with a press plate which is provided with a fastening hole and a threaded hole. The hacksaw comprises a main body which is provided at one end thereof with a grip which is provided at the lower end thereof with a pivoting portion. The main body is provided at other end thereof with an adjustment portion. The pivoting portion and the adjustment portion are connected with the blade. The present invention is characterized by the sectoral recess whose side wall is provided with a locating slot opposite to the angle graduation. The long support body is provided with a slide slot which is provided at both ends thereof with a suspension frame. The long support body is provided with a stop recess opposite to other end of the base. The slide slot is provided with an angle locating element which is provided with a retaining block. The angle locating element is provided thereunder with a hole and a movable hole in communication with the hole. A push rod is provided with a curved portion and a straight rod extending from the curved portion. The straight rod is provided with a spring. The push rod is provided with a locating threaded hole engageable with a locating screw. The dividing head seat is provided in the periphery thereof with a groove of a special angle. The adjustment seat is provided with an insertion slot and a specially-angled hole. The press plate is provided with an insertion strip opposite to the insertion slot of the adjustment seat. The fastening hole of the press plate and the fastening hole of the dividing head seat are engaged with a fastening screw. The specially-angled hole of the adjustment seat and the threaded hole of the press plate are provided with a C-type screw which is provided at the front thereof with a threaded portion and a press rod body extending from the threaded portion and having a diameter smaller than the diameter of the threaded portion. The specially-angled hole has a depth greater than the length of the press rod body. The pivoting portion is provided with a long strip hole for disposing the blade. The main body is provided with a pivoting hole in cooperation with a pivoting element of the blade. The pivoting element is provided with an insertion portion opposite to the hole of the blade. The adjustment portion comprises a long strip hole for disposing the blade. The main body is provided in two sides thereof with a long hole which is provided in the periphery thereof with the insertion slot. The main body is provided at the front end thereof with a recessed portion. A bracing element is provided in conjunction with the insertion slot. The bracing element is provided in two sides thereof with a pivoting hole engageable with a pivoting element which is provided with an insertion portion. The bracing element is further provided with an adjustment threaded hole corresponding in location to the recessed portion and engageable with an adjustment screw.
REFERENCES:
patent: 198472 (1877-12-01), Garretson
patent: 766799 (1904-08-01), Richards
patent: 1063113 (1913-05-01), Bremer
patent: 1182068 (1916-05-01), Ayer
patent: 1259380 (1918-03-01), Eagleson
patent: 5259284 (1993-11-01), Chen
patent: 5575191 (1996-11-01), Wang
patent: 5713258 (1998-02-01), Keddie
Druan, Jr. Thomas J.
Pro-Techtor Inter-national Services
Rada Rinaldi I.
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