Novel double-contact brake switch

Abstract

The utility model belongs to the technical field of brake switches of electric forklifts, and particularly relates to a novel double-contact brake switch which is mainly composed of a pressing rod, a mounting shell, a contact brake assembly, an upper protective shell, a lower protective shell, a T-shaped screw, a locking nut and the like. According to the utility model, through the arrangement of the contact braking assembly, under the pressing action of the pressing rod, the normally-closed contact of the contact braking assembly is switched off, and the normally-open contact is switched on; under the pressing action of the pressing rod, a normally-closed contact of the contact braking assembly is closed and a normally-open contact of the contact braking assembly is opened under the reset action of the reset spring, so that contact braking of the braking switch is realized; besides, two groups of normally-closed contacts and two groups of normally-open contacts are respectively arranged, so that the contact of the contacts is ensured, and the condition of brake failure caused by the fact that the contacts cannot be contacted is avoided.

Description

Technical Field

[0001] This utility model relates to the field of brake switch technology for electric forklifts, and in particular to a novel double-contact brake switch. Background Technology

[0002] With the rapid development of modern logistics and warehousing industries, the safety and reliability of electric forklifts, as important material handling tools, are receiving increasing attention. Electric forklifts play a vital role in improving work efficiency, reducing labor intensity, and minimizing environmental pollution. However, frequent safety accidents caused by potential braking system malfunctions during operation have become a focus of industry concern.

[0003] The braking system of an electric forklift is a core component of its safety performance. A key component of the braking system—the brake switch—is responsible for transmitting a braking signal when the driver operates the system, thereby achieving rapid vehicle stopping. Traditional electric forklift brake switches are single-contact switches. They send a braking signal to the controller, which then outputs a drive port to control the brake light relay. The relay contacts then control the brake lights. This solution requires the controller to have an output drive port to drive the brake relay; if the relay fails, the brake lights will not function. To address this problem, a dual-contact brake switch is proposed.

[0004] The dual-contact brake switch includes two pairs of contacts: one pair of normally open contacts and one pair of normally closed contacts. The normally open contacts are used to control the brake lights, and the normally closed contacts are used to give the controller a braking signal.

[0005] The working principle of the normally open contact control brake light circuit is as follows: When the electric forklift driver presses the brake pedal, the normally open contact in the double-contact brake switch closes, the circuit is connected, and current flows through the brake light, illuminating it. When the brake pedal is released, the normally open contact returns to the normally open state, the circuit is broken, and the brake light goes out.

[0006] The working principle of the normally closed contact signal circuit to the controller is as follows: Under normal conditions, the normally closed contact is closed, the circuit is conducting, and current flows through the controller, putting it in a standby state. When the electric forklift driver presses the brake pedal, the normally closed contact in the dual-contact brake switch opens, the circuit is broken, the controller receives the braking signal, and immediately executes the braking control command.

[0007] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this utility model, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0008] The purpose of this invention is to solve the technical problems existing in the background art. To this end, a novel double-contact braking switch is provided.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] A novel dual-contact brake switch includes a pressing rod and a mounting housing. One end of the pressing rod passes through the top of the mounting housing and extends into the interior of the mounting housing. A contact braking assembly is mounted on one end of the pressing rod, and the contact braking assembly is located inside the mounting housing.

[0011] The contact braking assembly includes an upper support plate, a lower support plate, an upper movable plate, and a lower movable plate;

[0012] The lower support plate is symmetrically provided with a normally open contact one, and the lower movable plate is symmetrically provided with a normally open contact two. The normally open contact one and the normally open contact two are in contact or separated. The lower movable plate is fixedly installed on the pressing rod by an auxiliary block. A reset spring is fixedly connected between the auxiliary block and the upper support plate.

[0013] The upper support plate is symmetrically provided with normally closed contact one, and the upper movable plate is symmetrically provided with normally closed contact two. The normally closed contact one and normally closed contact two are in contact or separated, and the upper movable plate is connected to the reset spring.

[0014] The following is a further defined technical solution of this utility model: the bottom of the mounting housing is connected to the base via a hook.

[0015] The upper support plate consists of two L-shaped strips, one side of which is adapted to the length of the mounting housing, and the other side of which extends from the top of the mounting housing to the bottom of the base.

[0016] The lower support plate consists of two L-shaped strips, one side of which is adapted to the length of the mounting housing, and the other side extends from the bottom of the mounting housing to the bottom of the base.

[0017] The following is a further defined technical solution of this utility model: the hook component includes a hook and a hook groove. The hook groove is symmetrically provided on the bottom outer wall of the mounting housing. The hook is integrally and symmetrically arranged on the top two sides of the base, and the hook is locked in the hook groove.

[0018] The following is a further defined technical solution of this utility model: an upper protective shell is provided on the outer side of the mounting housing, and a lower protective shell is provided on the outer side of the base. The upper protective shell and the lower protective shell are fitted together by an interference fit, and the pressing rod passes through the upper protective shell.

[0019] The following is a further defined technical solution of this utility model: the lower protective shell has four lead wire holes.

[0020] The following is a further defined technical solution of this utility model: the part of the pressing rod outside the mounting housing is sleeved with a T-shaped screw and extends to the outside of the T-shaped screw. The T-shaped screw includes an integrally formed ladder portion and a screw portion. The end of the ladder portion away from the screw portion abuts against the mounting housing. The screw portion penetrates the upper protective shell and the ladder portion abuts against the top of the inner wall of the upper protective shell.

[0021] The following is a further defined technical solution of this utility model: the screw part is threadedly connected to a locking nut, and the locking nut abuts against the upper protective shell.

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] This invention incorporates a contact braking assembly. When pressed by the pressing rod, the normally closed contact of the contact braking assembly opens, and the normally open contact closes. When there is no pressing action from the pressing rod, the normally closed contact closes and the normally open contact opens under the reset action of the return spring, thus achieving contact braking of the brake switch. Furthermore, two sets of normally closed and normally open contacts are provided to ensure contact and prevent braking failure due to incomplete contact.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a structural schematic diagram of the present invention from one perspective;

[0027] Figure 2 This is a structural schematic diagram from another perspective of this utility model;

[0028] Figure 3 This is a structural diagram of the present invention with the upper and lower protective shells removed.

[0029] Reference numerals: 1. Pressing rod; 2. Mounting housing; 3. Upper support plate; 4. Lower support plate; 5. Upper moving plate; 6. Lower moving plate; 7. Normally open contact one; 8. Normally open contact two; 9. Normally closed contact one; 10. Normally closed contact two; 11. Return spring; 12. Hook; 13. Upper protective housing; 14. Lower protective housing; 15. Lead wire hole; 16. T-screw; 17. Locking nut. Detailed Implementation

[0030] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0031] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0034] like Figure 1As shown, a novel dual-contact brake switch is provided, mainly composed of a pressing rod 1, a mounting housing 2, a contact braking assembly, an upper protective housing 13, a lower protective housing 14, a T-shaped screw 16, a locking nut 17, etc. When the pressing rod 1 is pressed, the normally closed contact of the contact braking assembly opens, and the normally open contact closes. When the pressing rod 1 is not pressed, the normally closed contact of the contact braking assembly closes, and the normally open contact opens, under the reset action of the return spring 11, thus realizing the contact braking of the brake switch.

[0035] like Figure 3 As shown, one end of the pressing rod 1 penetrates the top of the mounting housing 2 and extends into the interior of the mounting housing 2. A contact braking assembly is installed at one end of the pressing rod 1, and the contact braking assembly is located inside the mounting housing 2. The contact braking assembly mainly consists of an upper support plate 3, a lower support plate 4, an upper moving plate 5, a lower moving plate 6, a normally open contact 7, a normally open contact 8, a normally closed contact 9, a normally closed contact 10, and a return spring 11, etc. Specifically, the lower support plate 4 is symmetrically equipped with normally open contact 7, and the lower moving plate 6 is symmetrically equipped with normally open contact 8. The normally open contact 7 and normally open contact 8 are in contact or separated. The lower moving plate 6 is fixedly installed on the pressing rod 1 through an auxiliary block. The lower moving plate 6 is fixedly connected to the auxiliary block, and the return spring 11 is fixedly connected between the auxiliary block and the upper support plate 3. The upper support plate 3 is symmetrically provided with normally closed contact 19, and the upper moving plate 5 is symmetrically provided with normally closed contact 20. Normally closed contact 19 and normally closed contact 20 are in contact or separated. The upper moving plate 5 is connected to the return spring 11.

[0036] like Figure 3 As shown, the bottom of the mounting housing 2 is connected to the base via hook components. Specifically, the hook components include hooks 12 and hook grooves. Hook grooves are symmetrically provided on the outer bottom wall of the mounting housing 2, and hooks 12 are integrally and symmetrically arranged on both sides of the top of the base, with the hooks 12 engaging in the hook grooves.

[0037] like Figure 3 As shown, the upper support plate 3 is used for electrical connection between the normally closed contacts and the external circuit. Therefore, the upper support plate 3 needs to extend to the base. The bottom of the base is set as an opening, and the electrical connection is made through the lead hole 15 on the lower protective housing on the outside of the base. Therefore, the upper support plate 3 is composed of two L-shaped strips, one side of which is adapted to the length of the mounting housing 2, and the other side extends from the top of the mounting housing 2 to the bottom of the base.

[0038] Similarly, the lower support plate 4 is used for electrical connection between the normally open contacts and the external circuit. Therefore, the lower support plate 4 needs to extend to the base, the bottom of the base is set as an opening, and then the electrical connection is made through the lead hole 15 on the lower protective housing on the outside of the base. Therefore, the lower support plate 4 is composed of two L-shaped strips, one side of which is adapted to the length of the mounting housing 2, and the other side extends from the bottom of the mounting housing 2 to the bottom of the base.

[0039] like Figure 1 and 2 As shown, an upper protective shell 13 is provided on the outer side of the mounting housing 2, and a lower protective shell 14 is provided on the outer side of the base. The upper protective shell 13 and the lower protective shell 14 are fitted together with an interference fit, and the pressing rod 1 passes through the upper protective shell 13. The lower protective shell 14 has four lead holes 15, two of which are used for external circuits to be electrically connected to normally open contacts through the lower support plate 4, and the other two lead holes 15 are used for external circuits to be electrically connected to normally closed contacts through the upper support plate 3.

[0040] like Figure 3 As shown, the portion of the pressing rod 1 outside the mounting housing 2 is fitted with a T-shaped screw 16 and extends to the outside of the T-shaped screw 16. The T-shaped screw 16 includes an integrally formed stepped portion and a screw portion. The end of the stepped portion away from the screw portion abuts against the mounting housing 2. The screw portion penetrates the upper protective housing 13, and the stepped portion abuts against the top of the inner wall of the upper protective housing 13. A locking nut 17 is threadedly connected to the screw portion, and the locking nut 17 abuts against the upper protective housing 13.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the disclosed methods and techniques, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Therefore, all equivalent changes made based on the shape, structure, and principle of this utility model without departing from its technical solution should be covered within the protection scope of this utility model.

Claims

1. A novel dual-contact braking switch, characterized in that, It includes a pressing rod (1) and a mounting housing (2). One end of the pressing rod (1) passes through the top of the mounting housing (2) and extends into the interior of the mounting housing (2). A contact braking assembly is installed at one end of the pressing rod (1), and the contact braking assembly is located inside the mounting housing (2). The contact braking assembly includes an upper support plate (3), a lower support plate (4), an upper movable plate (5), and a lower movable plate (6); The lower support plate (4) is symmetrically provided with normally open contact one (7), and the lower moving plate (6) is symmetrically provided with normally open contact two (8). The normally open contact one (7) and the normally open contact two (8) are in contact or separated. The lower moving plate (6) is fixedly installed on the pressing rod (1) by an auxiliary block. A reset spring (11) is fixedly connected between the auxiliary block and the upper support plate (3). The upper support plate (3) is symmetrically provided with normally closed contact one (9), and the upper moving plate (5) is symmetrically provided with normally closed contact two (10). The normally closed contact one (9) and normally closed contact two (10) are in contact or separated. The upper moving plate (5) is connected to the reset spring (11).

2. The novel dual-contact brake switch as described in claim 1, characterized in that, The bottom of the mounting housing (2) is connected to the base via hooks; The upper support plate (3) is composed of two L-shaped strips, one side of which is adapted to the length of the mounting housing (2), and the other side extends from the top of the mounting housing (2) to the bottom of the base. The lower support plate (4) is composed of two L-shaped strips, one side of which is adapted to the length of the mounting housing (2), and the other side extends from the bottom of the mounting housing (2) to the bottom of the base.

3. A novel dual-contact braking switch as described in claim 2, characterized in that, The hook component includes a hook (12) and a hook groove. The hook groove is symmetrically provided on the bottom outer side wall of the mounting housing (2). The hook (12) is integrally and symmetrically arranged on the top two sides of the base, and the hook (12) is locked in the hook groove.

4. A novel dual-contact brake switch as described in claim 2, characterized in that, The outer side of the mounting housing (2) is provided with an upper protective shell (13), and the outer side of the base is provided with a lower protective shell (14). The upper protective shell (13) and the lower protective shell (14) are fitted together by an interference fit, and the pressing rod (1) passes through the upper protective shell (13).

5. A novel dual-contact brake switch as described in claim 4, characterized in that, The lower protective housing (14) has four lead wire holes (15).

6. A novel dual-contact brake switch as described in claim 4, characterized in that, The pressing rod (1) is sleeved with a T-shaped screw (16) on the part outside the mounting housing (2) and extends to the outside of the T-shaped screw (16). The T-shaped screw (16) includes an integrally formed tiered part and a screw part. The end of the tiered part away from the screw part abuts against the mounting housing (2). The screw part penetrates the upper protective shell (13) and the tiered part abuts against the top of the inner wall of the upper protective shell (13).

7. A novel dual-contact brake switch as described in claim 6, characterized in that, The screw is threadedly connected to a locking nut (17), which abuts against the upper protective shell (13).

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