CN211869027U

CN211869027U - Blackboard vernier compass for teaching

Info

Publication number: CN211869027U
Application number: CN201921016350.1U
Authority: CN
Inventors: 王硕; 周正元
Original assignee: Changzhou College of Information Technology CCIT
Current assignee: Changzhou College of Information Technology CCIT
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-11-06
Anticipated expiration: 2029-07-02

Abstract

The utility model discloses a blackboard vernier compass for teaching, including deciding foot subassembly and commentaries on classics foot subassembly, decide foot subassembly including deciding foot, handle and deciding foot and glue the sucking disc, the commentaries on classics foot subassembly includes commentaries on classics foot, locking washer, chalk, groove chi, the fixed spiral shell of commentaries on classics foot and parallels, the commentaries on classics foot subassembly encircles decides the foot subassembly and draws circle or circular arc. A blackboard vernier compasses for teaching, its beneficial effect lies in, not only can utilize the groove chi to accurately draw the circle, and decides the foot and firmly fix nimble rotation on the blackboard, plays the protection blackboard face and not by the fish tail.

Description

Blackboard vernier compass for teaching

Technical Field

The utility model relates to a teaching aid, concretely relates to blackboard vernier compasses are used in teaching.

Background

The existing teaching compasses are rough and can draw a circle or an arc with a specified size by matching with a ruler. The pointed compasses fixed foot can not only be reliably fixed, but also can scratch the blackboard face.

Disclosure of Invention

The utility model discloses an overcome above-mentioned defect, develop a blackboard vernier compasses for teaching, including deciding foot subassembly and commentaries on classics foot subassembly, its characterized in that, the commentaries on classics foot subassembly encircles decides the foot subassembly and draws circle or circular arc.

Preferably, the foot fixing assembly comprises a foot fixing body, a handle and a foot fixing rubber suction cup.

Preferably, the inner hole of the handle is rotatably sleeved at the outer cylinder with the same diameter at the upper end of the fixed foot, and the fixed foot groove in the fixed foot is clamped by the fastening screw, so that the handle is prevented from being separated from the fixed foot.

Preferably, the fixed-foot rubber sucker is provided with an upper sucker cross line, the upper end of the fixed-foot rubber sucker can be rotatably inserted into a hole with the same diameter at the lower end of the fixed foot, the fixed-foot rubber sucker is clamped in a sucker groove in the fixed-foot rubber sucker through a set screw so as to ensure that the fixed-foot rubber sucker and the fixed foot are stable, and the relative position of the fixed foot is fixed through the set screw and a locking nut and is locked so as not to rotate and deviate.

Preferably, the rotating foot assembly comprises a rotating foot, a locking ring, chalk, a graduated scale, a rotating foot fixing screw and a sizing block.

Preferably, the swivel foot is slidably sleeved on the graduated scale through a rectangular groove in the upper part of the swivel foot, and the swivel foot fixing screw can fix the swivel foot on the graduated scale.

Preferably, the chalk is movably arranged in a hole at the lower end of the rotating leg, the locking ring moves upwards in a rotating mode, and the chalk can be locked in the hole at the lower end of the rotating leg by connecting the locking ring with an expansion sleeve at the lower end of the rotating leg through threads in the locking ring.

Preferably, the sizing block is placed between the rotating leg fixing screw and the reticle ruler to play a role in protecting the reticle ruler.

A blackboard vernier compasses for teaching, its beneficial effect lies in, not only can utilize the groove chi to accurately draw the circle, and decides the foot and firmly fix nimble rotation on the blackboard, plays the protection blackboard face and not by the fish tail.

Drawings

Fig. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of the foot-fixing rubber suction cup.

The device comprises a rotating foot 1, a locking ring 2, a chalk 3, a set screw 4, a locking nut 5, a foot fixing rubber sucker 6, a foot fixing 7, a graduated scale 8, a handle 9, a foot fixing screw 10, a sizing block 61, a sucker cross line 62, a sucker groove 71 and a foot fixing groove 71.

Detailed Description

In order to make the technical field person understand the scheme of the present invention better, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical scheme in the embodiments of the present invention. It is to be understood that the embodiments described are merely exemplary of the invention, and that no limitations are intended to the details of construction or design herein shown. The present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of providing a more thorough understanding of the present disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The embodiment combines the attached figures 1-2, a blackboard vernier compass for teaching, includes and decides foot subassembly and commentaries on classics foot subassembly, the commentaries on classics foot subassembly encircles and decides foot subassembly and draws circle or circular arc, decides foot subassembly including deciding foot 7, handle 9 and deciding foot glue sucking disc 8, the rotatable cover of hole on the handle 9 is in the same diameter outer cylinder department of deciding the foot 7 upper end, thereby guarantees through holding screw 4 card in deciding foot slot 71 in deciding foot 7 that handle 9 can not deviate from deciding foot 7. The upper end of the fixed foot rubber suction disc 6 is rotatably inserted into the same diameter hole at the lower end of the fixed foot 7, the fixed foot rubber suction disc 6 is provided with an upper suction disc cross 61 through a set screw 4, the fixed foot rubber suction disc 6 and the fixed foot 7 are stable and guaranteed in a suction disc groove 62 in the fixed foot rubber suction disc 6, and the fixed foot 7 is fixed and locked at the relative position through the set screw 4 and a locking nut 5 and cannot rotate and depart from the fixed foot 7.

The rotating leg assembly comprises a rotating leg 1, a locking ring 2, chalk 3, a marking ruler 8, a rotating leg fixing screw 10 and a sizing block 11. The rotary foot 1 is sleeved on the scribing ruler 8 in a sliding manner through a rectangular groove in the upper portion of the rotary foot 1, the rotary foot fixing screw 10 can fix the rotary foot 1 on the scribing ruler 8, the chalk 3 can be movably installed in a lower end hole of the rotary foot 1, the locking ring 2 moves upwards in a rotating manner and is connected with an expanding sleeve at the lower end of the rotary foot 1 through threads in the locking ring 2, and the chalk 3 can be locked in the lower end hole of the rotary foot 1. The sizing block 11 is arranged between the turning leg fixing screw 10 and the reticle 8, and plays a role in protecting the reticle 8.

During the installation, earlier with the accurate pre-installation of graduated scale 8 and fixed foot 7, weld the two precision again, will change 1 upper end square groove of foot, can slide the cover on graduated scale 8, cushion iron 11 on the pad, the fixed spiral shell 10 of foot of rotating, install in 7 bottom holes of fixed foot with fixed foot glue sucking disc 6 again after that, screw in holding screw 4 blocks in the sucking disc slot 62 of fixed foot glue sucking disc, reuse lock nut 5 locks to when fixed foot glue sucking disc 6 rotates for fixed foot 7, holding screw 4 is not hard up. The upper end of the fixed foot 7 is provided with a fixed foot groove 71 column, a handle 9 is rotatably sleeved on the fixed foot 7 column, and a set screw 12 is screwed in and clamped in the fixed foot groove 71. When the rotary foot assembly is used, chalk 3 with proper length is inserted into the lower end of the rotary foot 1 to ensure that the fixed foot and two feet of the rotary foot assembly are equal in height, the locking ring 2 is locked by rotation, the rotary foot fixing screw 10 is loosened to enable the rotary foot 1 to move along the scribing ruler 8, and the scribing indication size aligned with the rotary foot triangle 1-1 is the radius of a circle to be drawn on a workpiece. When the suction cup cross line 61 on the foot-fixing rubber suction cup 6 is superposed with the central line of the line to be drawn, the center of the circle to be drawn is found. The hand holds the handle 9 and presses down lightly to ensure that the fixed foot does not move relative to the blackboard, and the other hand holds the reticle 8 and draws a circle or an arc around the fixed foot 7.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent replacements may be made for some of the technical features of the embodiments described above. All utilize the equivalent structure that the content of the utility model discloses a specification and attached drawing was done, direct or indirect application is in other relevant technical field, all is in the same way the utility model discloses within the patent protection scope.

Claims

1. A blackboard vernier compass for teaching comprises a fixed foot assembly and a rotating foot assembly, and is characterized in that the rotating foot assembly surrounds the fixed foot assembly to draw a circle or an arc, the fixed foot assembly comprises a fixed foot (7), a handle (9) and a fixed foot rubber sucker (6), an inner hole on the handle (9) is rotatably sleeved at the position of an outer cylinder with the same diameter at the upper end of the fixed foot (7), the fixed foot rubber sucker (6) is clamped in a fixed foot groove (71) in the fixed foot (7) through a set screw (4) to ensure that the handle (9) cannot be separated from the fixed foot (7), an upper sucker cross line (61) is arranged on the fixed foot rubber sucker (6), the upper end of the fixed foot rubber sucker (6) is rotatably inserted in the hole with the same diameter at the lower end of the fixed foot (7), and is clamped in a sucker groove (62) in the fixed foot rubber sucker (6) through the set screw (4) to ensure that the fixed foot rubber sucker (6) is stable with the fixed foot, and the relative position of the fixed leg (7) is fixed and locked by a set screw (4) and a locking nut (5) and can not be rotated and separated, and the rotating leg assembly comprises a rotating leg (1), a locking ring (2), chalk (3), a marking ruler (8), a rotating leg fixing screw (10) and a sizing block (11).

2. A vernier compass for teaching as claimed in claim 1, wherein said rotor (1) is slidably fitted over the reticle (8) through a rectangular groove formed in the upper portion thereof, and said rotor fixing screw (10) fixes the rotor (1) to the reticle (8).

3. The blackboard vernier compass for teaching as claimed in claim 2, wherein the chalk (3) is movably installed in the lower end hole of the rotating leg (1), the locking ring (2) rotates to move upwards, and the chalk (3) can be locked in the lower end hole of the rotating leg (1) by connecting the thread in the locking ring (2) with the lower end expansion sleeve of the rotating leg (1).

4. A vernier compass for teaching as claimed in claim 3, wherein a spacer (11) is disposed between said foot fixing screw (10) and the reticle (8) to protect the reticle (8).