CN201744713U

CN201744713U - Telescopic drill bit

Info

Publication number: CN201744713U
Application number: CN2010201920200U
Authority: CN
Inventors: 张志行
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-11
Filing date: 2010-05-11
Publication date: 2011-02-16
Anticipated expiration: 2020-05-11

Abstract

The utility model relates to a telescopic drill bit with an adjustable drill bit diameter and an adjustable drill hole depth. The telescopic drill bit comprises a drill rod, V-shaped brackets, a curve cutter, a pull rod, a movable shaft, a rotary rod and a telescopic rod and is characterized in that: the curve cutter is arranged between two groups of V-shaped brackets; a cutter groove is formed at a contraction position which is on the head part of the drill rod and corresponds to the curve cutter; the tip of each bracket is connected with the movable shaft and a fixed shaft respectively; the movable shaft is connected with the pull rod in a sliding cavity of the drill rod; the other end of the pull rod is connected with the telescopic rod; and an L-shaped rotary rod is connected crosswise with the pull rod on one end part. The telescopic drill bit has simple structure, increases the operation functions of a cutter, has high stability and is rapid and efficient to process; and the drill bit diameter and the drill hole depth can be adjusted at any time as required.

Description

Expansion bit

Technical field

The utility model relates to the adjustable expansion bit of a kind of external diameter.

Background technology

Existing bit drills cutter is fixed, the outside diameter size is certain, and engineering the drilling also requires drill bit can reach flexible adjustable at present, promptly regulate bit diameter and drilling depth as required at any time, to increase drill bit tool function and stability, the existing fixed drill bit then can't be realized this requirement.

Summary of the invention

The purpose of this utility model be to design a kind of simple in structure, tool function increases, stability high, the expansion bit of processing quickness and high efficiency, can regulate bit diameter and drilling depth as required at any time.

Technical scheme provided by the utility model for achieving the above object is: a kind of expansion bit, comprise drilling rod, V-type support, curve cutter, pull bar, movable axis, swing arm and expansion link, it is characterized in that between two groups of V-type supports the curve cutter being housed, drilling rod head and be provided with the cutter groove corresponding to the contraction position of curve cutter, top place is connected with movable axis and dead axle respectively at support, movable axis is connected with pull bar in being located at the sliding chamber of drilling rod, be connected with expansion link at the pull bar other end, L type swing arm is connected with the end portions cross of pull bar at pull bar.

Described pull bar single face shaft has helicla flute, the threaded engagement of this helicla flute and the vertical shaft of L type swing arm.

The utlity model has simple in structure, increased cutter operation function, high, the processing quickness and high efficiency of stability, can regulate advantages such as bit diameter and drilling depth as required at any time.

Description of drawings

Accompanying drawing is a sectional structure schematic diagram of the present utility model.

The specific embodiment

Referring to accompanying drawing, the utility model mainly is made up of drilling rod 6, V-type support 1, curve cutter 4, pull bar 8, movable axis 5, swing arm 7 and expansion link 13, between two groups of V-type supports 1 curve cutter 4 is housed, be provided with the cutter groove 11 of shrinkage curve cutter at drilling rod 6 heads and corresponding to the contraction position of curve cutter 4, curve cutter and shrink cutter groove 11 and can be designed to two groups or four groups; V-type support 1 summit that is positioned at drill bit 2 tail ends connects dead axle 3, and the top place of support connects movable axis 5 relatively, and movable axis 5 pull bar 8 interior with being located at sliding chambeies of drilling rod 6 10 is connected; Be connected with projection 9 at pull bar 8 tail ends, this projection 9 is connected with the groove 12 of expansion link 13 end faces, to regulate bit depth; L type swing arm 7 is connected with the end portions cross of pull bar 8 at pull bar, and the single face shaft of pull bar 8 has helicla flute, the whole threaded engagement of this helicla flute and L type swing arm 7 vertical shafts.When rotating counterclockwise swing arm 7, swing arm drives pull bar and the V-type support shrinks drill bit, clockwise rotates swing arm drill bit is opened.

Claims

1. expansion bit, comprise drilling rod, V-type support, curve cutter, pull bar, movable axis, swing arm and expansion link, it is characterized in that between two groups of V-type supports the curve cutter being housed, drilling rod head and be provided with the cutter groove corresponding to the contraction position of curve cutter, top place is connected with movable axis and dead axle respectively at support, movable axis is connected with pull bar in being located at the sliding chamber of drilling rod, is connected with expansion link at the pull bar other end, and L type swing arm is connected with the end portions cross of pull bar at pull bar.

2. expansion bit according to claim 1 is characterized in that described pull bar single face shaft has helicla flute, the threaded engagement of this helicla flute and the vertical shaft of L type swing arm.