Jig-boring device

• US 5,062,747 A
• Filed: 01/10/1990
• Issued: 11/05/1991
• Est. Priority Date: 01/10/1990
• Status: Expired due to Fees

• Current Assignee: Ming-Tang Chen
• Original Assignee: Ming-Tang Chen
• Inventors: Chen, Ming-Tang
• Primary Examiner(s): Schwartz, Larry I.
• Assistant Examiner(s): Schultz, Robert
• Application Number:
  US07/463,195
• Time in Patent Office: 664 Days
• Field of Search: 408/115 R, 408/115 B, 408/72 R, 408/72 B, 408/112, 33/673, 33/675, 33/667, 74/110, 83/522.18, 83/522.25, 83/821, 83/829, 7/150
• US Class Current: 408/115.00R
• CPC Class Codes: B23B 2260/088 Indication scales
• CPC Class Codes: B23B 47/287 Jigs for drilling plate-like workpieces templates for marking the position of fittings on wings or frames E05D11/0009
• CPC Class Codes: B25H 1/0078 Guiding devices for hand tools
• CPC Class Codes: Y10T 408/55 with work-engaging structure other than Tool or tool-support
• CPC Class Codes: Y10T 408/5653 with means to bias Tool away from work
• CPC Class Codes: Y10T 408/567 Adjustable, tool-guiding jig
• CPC Class Codes: Y10T 74/18992 Reciprocating to reciprocating
• CPC Class Codes: Y10T 83/8878 Guide

Abstract

A jig-boring device, comprising an axle barrel which connects with bottom plate and is sheathed with lower gear, fixed support, upper gear and cover plate; a circular bottom plate connected to the bottom of the axle barrel; a lower gear placed on bottom plate sheathing the axle barrel; a fixed mount placed on lower gear sheathing the axle barrel; an upper gear placed on fixed support sheathing the axle barrel; a cover plate placed on upper gear sheathing the axle barrel; a lock nut which screws to the top outer periphery of the axle barrel; two pairs of measuring staffs which connect to two pairs of measuring staff brackets respectively; and two pairs of measuring staff brackets, placed symmetrizing each other on the bottom plate and fixed support respectively, which can measure out the abscissa and vertical coordinate of a desired bore center position about a work object.

Claims

1. A jig-boring device, comprising:

a hollow circular axle barrel, a bottom plate having a central opening, a lower gear having an extended portion, a fixed support, an upper gear having an extended portion, a lock nut, two pairs of measuring staff brackets, two pairs of parallel measuring staffs;

said hollow circular axle barrel being perpendicular to the central opening of said bottom plate, and surrounded by said lower gear, said fixed support, and said upper gear, and having male threads at its top outer periphery to securely thread with said lock nut;

said bottom plate, comprising a circular plate with the central opening connected to said axle barrel and having a symmetry of guide grooves as well as cross nut pieces in its upper area where one of said pair measuring staff brackets is connected thereby and is guided in its moving back or forth;

said lower gear, having a central opening surrounding said axle barrel, having its extended portion in its upper area to insert said fixed support above to get positioned thereby;

said fixed support, comprising a short cylindric block, fixed between said lower gear and said upper gear, and having a central opening surrounding said axle barrel, said support having a concave portion in its central upper and lower areas which corresponds to the extended portion of the lower gear and upper gear for them to insert, and having a symmetry of guide grooves and cross nut pieces in the upper area outside said concave portion where the other of said pair of measuring staffs make connection thereto;

an upper gear, which has all the same structure as said lower gear but having said extended portion in its lower area to insert into said fixed portion;

each of said measuring staffs comprising a longitudinal rack having a rectilinear shape, each staff having an upper outward face scaled with length scales while the upper inward face is a longitudinal rack rim, and said pairs of staffs are placed parallel beside the opposing two sides of said lower gear and upper gear, one pair perpendicularly crossing the other pair, and each staff having direction-turntable rest plates at an end for touching with a basic plane when in use;

said two pairs of measuring staff brackets comprising a U-support, a screw stem and a handlebar, connected to the symmetry of guide grooves and cross nut pieces provided in the upper areas of said bottom plate and fixed support respectively, so as to guide each said pair of measuring staffs inserted in their U-supports in their movement;

a cover plate, which by means of a central opening therein surrounds said axle barrel and is above the top of said fixed support;

said lock nut, screws to the male threads of the top outer periphery of said axle barrel; and

wherein said device measures bore center position on work objects.

2. A jig-boring device as recited in claim 1, wherein two fixed columns are built perpendicularly on said cover plate, standing on a central line thereof, and each surrounded with a compression spring for supporting a fixed mount sheathing the two fixed columns to which a driller is connected with its central line aiming the center of said axle barrel.

3. A jig-boring device as recited in claim 1, wherein angle degrees are scaled on said cover plate upper surface and two fixed columns are sheathed with guide-saw mounts between which a hand saw blade are inserted to saw work objects at any pre-set angles.