Counter balance for middle school teaching

A pallet balance, secondary technology, applied in the direction of measuring devices, instruments, weighing, etc., can solve the problems of easily damaged knife edge, reduced accuracy of pallet balance, time-consuming and labor-intensive rubber sleeves, etc.

CN107806922AActive Publication Date: 2018-03-16盐城发特集团公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2018-03-16

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Abstract

The invention discloses a counter balance for middle school teaching. The counter balance comprises a base and vertical support arms. Insert holes are formed in the upper surface of the base. The bottom portion of each vertical support arm is provided with a first magnet. A rotating disk fixedly inserted to a fulcrum shaft is arranged under each insert hole. The outer circle side wall of each rotating disk is provided with a plurality of convex teeth. Second magnets and third magnets are arranged alternately on the plurality of convex teeth. The second magnet and one end of a first magnet areopposite poles, and the third magnet and one end of the first magnet are same poles. A through hole is formed in the bottom portion of the insert hole. An external thread is formed on the outer wall of each vertical support arm. An adjusting gear pressed against the upper surface of the base is screwed in each vertical support arm. One side of each adjusting gear is engaged with a horizontal toothbar. The two adjusting gears at the two sides of the base are engaged to the two sides of the tooth bar respectively. A placement groove is formed in the upper surface of the base. The tooth bars areinserted into the placement groove. The two-end inner walls of the placement groove are respectively provided with a magnet layer. The two ends of the tooth bar are respectively provided with an ironlayer. The counter balance can effectively protect edges when placed.
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Description

Technical field:

[0001] The invention relates to the technical field of middle school teaching instruments, in particular to a tray balance used in middle school teaching. Background technique:

[0002] The tray balance is one of the necessary instruments in the laboratory in middle school teaching. It is made by the principle of Roberwell. The weighing pan is stressed on the bottom plane and can automatically move to the center position in the non-center position to form a balance. The tray balance mainly includes a base, a middle tool rest, a vernier, a lever with a scale, and a tray. The tray is installed at both ends of the lever through a hanger. In the hole, the outer periphery of the vertical support arm under the tray is provided with a rubber sleeve for protecting the knife holder, which is fixed in the corresponding fixing hole on the base through the rubber sleeve. Before the existing pallet balance is used, the protective rubber sleeves under the two pallets nee...

Examples

Embodiment Construction

[0019] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] see figure 1 , figure 2 , a pallet balance used in middle school teaching according to the present invention, comprising a base 1, a middle knife rest 2, a lever 3 with a scale and a pallet 4, and the pallet 4 is installed on both ends of the lever 3 through the hanger 5 , the lower end of the hanger 5 is provided with a vertical support arm 6, the upper end surface of the base 1 is formed with a socket 11, the lower end of the vertical support arm 6 extends into the socket 11, and the bottom of the vertical support arm 6 is provided with There is a first magnet 71, and a turntable 8 inserted and fixed on a support shaft 81 is provided below the socket 11. A plur...