JP2559308Y2 - Lifting platform switch device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch device for a lifting platform in which a platform is lifted and lowered by using a foot to lift and lower the platform.

[0002]

2. Description of the Related Art
In a lorry equipped with a lifting device having a lifting platform, the lifting operation of the lifting platform is generally performed by a switch device using a manually operated push button switch. By the way, a switch device using a manually operated push button switch requires an operation by an operator at the time of cargo handling work, and thus has a problem in operability at the time of cargo handling work. For example, when the operator who operates the lifting and lowering is carried on the lifting platform to support luggage and both hands are not empty,
Switch operation is difficult.

In view of the above, the present invention has been made in view of the above points, and it is possible to improve the operability by realizing an inexpensive operating means with a simple structure by making it possible to perform an operation by foot in raising and lowering a lifting platform of a lorry. It is an object of the present invention to provide a switching device.

[0004]

In order to achieve the above object, a switch device for a lifting platform according to the present invention includes a case provided with a fitting recess opening on the upper surface and a storage recess connected to the fitting recess. A micro switch housed in the housing recess having an operation unit that operates a contact point by pressing, a top surface is a convex surface, and a bottom surface side has a protrusion facing the operation unit of the micro switch, A foot switch having a fitting convex portion fitted to the fitting concave portion on the outer peripheral portion, and a stepping elastic member that presses the operation unit opposed to the convex portion when the convex surface is pressed; At least one lift platform is provided so that the convex surface protrudes from the upper surface.

[0005]

In the switch device of the lifting platform according to the present invention, by stepping on the convex surface of the stepping elastic member with the foot, the convex portion on the bottom side of the stepping elastic member presses the operating portion of the microswitch facing the inside of the case. The lift platform is provided with at least one foot switch for activating the contacts of the microswitch.
Therefore, by using the foot switch as the operating means of the lifting device for driving the lifting platform up and down, it becomes possible for the operator who rides on the lifting platform to perform the lifting operation of the lifting platform by foot operation. Is improved. In addition, the foot switch as the operating means can be obtained at a low price because the waterproof property can be ensured by pressing the stepping elastic member against the case-side fitting concave portion, and the structure is simple and easy to manufacture.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a switch device for a lifting platform according to the present invention.

FIGS. 1 to 4 show a main part of an embodiment of a switch device of a lifting platform according to the present invention, and FIGS. 5 and 6 show an entire structure of the embodiment. First, the overall configuration of FIGS. 5 and 6 will be described. In these figures, the switch device of the lifting platform is provided with an upper plate 60 of the lifting platform 57 of the lifting device mounted on the lorry 51.
The up switch 10A, the main switch 10B, and the down switch 10C are fixed near one peripheral edge of
The switch device of the lifting platform according to the present embodiment is used for performing an operation of raising and lowering the lifting platform 57 in a horizontal state. The up switch 10A, the main switch 10B, and the down switch 10C are foot switches having the same structure, and the up switch 10A and the main switch 10B, or the main switch 10B and the down switch 10C can be simultaneously depressed by any one of the feet. Switches 10A, 10B, 1
The upper part of OC is fixed so as to protrude from the upper surface of upper plate 60 (main switch 10B is at an intermediate position).

The lifting device mounted on the truck 51 fixes a lifting frame 53 to a chassis 52 of the truck 51, and a main arm 54 and a mounting bracket 56 provided integrally with the lifting frame 53. One end of the sub arm 55 is pivotally connected, and the other ends of the main arm 54 and the sub arm 55 are pivotally connected to a mounting bracket 58 provided integrally on the rear end side of the lifting platform 57. Both ends of the main arm 54 and the sub-arm 55 are pivotally connected to mounting brackets 56 and 58 of the lifting device frame 53 and the lifting platform 57 by pins, thereby connecting the lifting device frame 53 and the lifting platform 57 in parallel. A link is formed, and the link is rotated by a drive device using a hydraulic cylinder or the like, and the lift platform 57 is raised and lowered in a horizontal state.

[0009] In some cases, a mechanism for raising and lowering a lifting platform by vertical guide means is used as a lifting device mounted on a lorry.

Details of the foot switch 10 used as the up switch 10A, the main switch 10B and the down switch 10C are shown in FIGS. In these figures, the foot switch 10 includes a disc-shaped resin case 1, a stepping elastic member (a rubber member or the like) 2, and a micro switch 3.

As shown in FIGS. 7 to 10, the resin case 1 has a cylindrical portion 6 integrally on the bottom side of a mounting portion 5 formed in a flange shape. A fitting recess 4 having a circular opening is formed in the fitting recess 4.
Are formed in the columnar portion 6. The mounting portion 5 has a pair of mounting holes 8 formed therein, and the cylindrical portion 6 has a positioning side surface 9 in which a part of the outer peripheral surface is cut out in a vertical plane. The fitting recess 4
The mounting part 5 having a small diameter disc is superimposed on a large diameter disc.
3 and a small-diameter portion 14 above the small-diameter portion 3.
The stepping elastic member (rubber member or the like) 2 is fitted and fixed to the upper side of the resin case 1 by using the fitting concave portion 4.

The housing recess 7 houses the microswitch 3 and is provided on the bottom surface of the fitting recess 4 so as to be continuous with the fitting recess 4 in a substantially elliptical cylindrical shape. It is parallel to the alignment side 9
One in the longitudinal direction is opened as a terminal lead-out hole 17 on the outer surface of the columnar portion 6. In addition, the cylindrical portion 6 includes
A pair of through holes 18 are formed perpendicular to the longitudinal direction of the positioning side surface 9 and the storage recess 7 from the positioning side surface 9 to the opposite side. The positioning side surface 9 defines the direction of the resin case 1 when the micro switch 3 is stored in the storage recess 7.

As shown in FIGS. 11 and 12, the stepping elastic member (rubber plate member) 2 is formed in a substantially disk shape having a convex surface 25 whose upper surface is spherical (curved). In order to fit into the large-diameter portion 13 forming the annular groove on the inner periphery of the fitting recess 4 of the resin case 1, the upper portion of the outer peripheral portion is formed with the same diameter as the diameter of the small-diameter portion 14, and is formed on the lower outer periphery. Is formed integrally with an annular fitting protrusion 21 having the same diameter as the large diameter portion 13 (however, before fitting into the case 1, the outer diameter of the annular fitting protrusion 21 is slightly larger. , Large diameter part 1 when fitted
3. ). A concave portion 23 having an opening 22 on the bottom surface side is formed in the elastic member 2 for stepping, and a cylindrical convex portion 24 projecting from the ceiling surface toward the bottom surface is integrally formed in the concave portion 23. Then, the stepping elastic member 2 can push down the bottom surface of the cylindrical convex portion 24 by applying a force downward from the upper surface,
When the force is released, the original state (the state shown in FIG. 11) is restored by the elasticity of the rubber.

The microswitch 3 has a substantially rectangular parallelepiped shape, and has an operation portion 31 on its upper surface for operating a contact by pressing and three terminals 32 on a bottom surface. The contacts connecting between the contacts 32 are short-circuited or opened.
For example, the left end of the three terminals 32 in FIG. 1 is a common terminal, the middle one is a normally open contact terminal, the right end is a normally closed contact terminal, and by using the common terminal and the normally open contact terminal. A normally open contact can be configured, and a normally closed contact can be configured by using a common terminal and a normally closed contact terminal. Further, a pair of mounting holes 33 penetrating vertically is provided on the longitudinal side surface of the microswitch 3.

The microswitch 3 is housed and fixed in a housing recess 7 below the resin case 1. That is, the microswitch 3 is fitted and positioned in the storage recess 7, and the operation portion 31 is positioned substantially at the center when viewed from the opening 15. Further, the pair of mounting holes 33 on the side surface of the micro switch 3 coincide with the through holes 18, and the micro switch 3 is fixed to the resin case 1 by inserting spring pins 35 so as to penetrate both of them. I have.

The stepping elastic member 2 comprises a resin case 1
It is fitted and fixed in the upper fitting recess 4. That is, the stepping elastic member 2 has a lower annular fitting convex portion 21.
Is fitted into the large-diameter portion 13 of the fitting concave portion 4, and is fixed to the resin case 1 in a watertight state so as not to come out upward by pressing, and the upper spherical convex surface 25 of the resin case 1 It protrudes from the upper surface. Further, the columnar convex portion 24 in the concave portion 23 on the bottom surface side of the stepping elastic member 2 faces the operation portion 31 of the microswitch 3 with a space.

As described above, the foot switch 10 having the elastic member 2 for stepping on the upper side of the resin case 1 and the microswitch 3 in the resin case 1 is obtained.

As shown in FIGS. 3 and 4, the foot switch 10 has a switch mounting hole 61 formed in an upper plate 60 of a lifting platform 57 of a lorry 51.
The cylindrical portion 6 of the resin case 1 is fitted into the mounting portion 5, the upper portion protrudes from the mounting portion 5 to the upper surface of the upper plate 60, and a pair of mounting holes 8 formed in the mounting portion 5 and the upper plate 60 are formed. Mounting hole 62
Are fixed to the upper plate 60 with bolts 63 and nuts 64, for example.

Here, the operation of the foot switch 10 will be described. The operation of the foot switch 10 is performed by pushing or releasing the convex surface 25 of the elastic member for stepping (rubber member or the like) 2 with a foot, and the convex surface 2 of the elastic member 2 for stepping.
5 is depressed downward by stepping on the foot, whereby the bottom surface of the cylindrical convex portion 24 is pushed down, and the operation portion 31 of the microswitch 3 facing the cylindrical convex portion 24 is pressed. Due to the pressing of the operation unit 31, the connection between the common terminal (left end position) and the normally open contact terminal (intermediate position) of the three terminals 32 of the microswitch 3 is turned on, and the connection between the common terminal and the normally closed contact terminal (right end position). Is turned off.

The amount of depression of the stepping elastic member 2 at the time of stepping on the foot is limited only to the amount protruding from the upper surface of the resin case 1. An excessive force is not applied to the operation unit 31 of the microswitch 3 that hits the bottom surface of the projection 24.

When the foot is released from the stepping elastic member 2 and the pressing force is released, the stepping elastic member 2 returns to its original state by the elastic force of the material such as rubber. The bottom surface is separated from the operation unit 31 of the microswitch 3, and the common terminal of the three terminals 32 of the microswitch 3 −
The normally open contact terminals are turned off, and the common terminal and normally closed contact terminals are turned on. Thus, the foot switch 1
0 indicates an on-operation (or an off-operation) by pressing the stepping elastic member 2 with a foot, and an off-operation (or an on-operation) by reversing the switch state by releasing the foot from the stepping elastic member 2 and returning to the original position. ).

Here, an example of operation of the lifting device by the switch device of the lifting platform provided with the lifting switch 10A, the main switch 10B and the lowering switch 10C on the lifting platform 57 will be described. In this case, when raising and lowering the platform 57 shown in FIGS. 5 and 6, the raising switch 10A and the main switch 10B are simultaneously depressed with one of the feet. As a result, the lifting switch 10A and the main switch 10B are depressed by the respective elastic members 2 for stepping, and the microswitch 3
Are simultaneously turned on (or off). The lifting platform drives the lifting platform 57 upward. When lowering the lifting platform 57, the main switch 10B and the lowering switch 10C are simultaneously depressed with one of the feet. As a result, in the main switch 10B and the down switch 10C, the respective stepping elastic members 2 are depressed, and both micro switches 3 are simultaneously turned on (or off), and the lifting platform 57 is driven downward by the lifting device. You.

In the elevating operation of the elevating platform 57, the ascending platform 5 of the lorry 51 is lifted during the ascent.
The lower end of the mounting bracket 58 is in contact with the ground at the time of lowering, and the lowering limit (position of 57B in FIG. 1). As described above, in order to move the lifting platform 57 up and down, the operation cannot be performed unless the main switch 10B is depressed at the same time as the elevation switch 10A or the depression switch 10C is depressed.

According to the above-described embodiment, the lifting operation of the lifting platform can be executed by stepping on both the raising switch 10A and the main switch 10B or both the main switch 10B and the lowering switch 10C with a foot. Is no longer necessary, so that operability can be improved. For example, the lifting operation can be performed even when both hands are not available because the operator who operates the lifting operation gets on the platform and supports the load.

The foot switch 10 used for each of the switches 10A, 10B, 10C has a simple structure, and the resin case 1 and the stepping elastic member 2 can be easily molded, respectively, and the manufacturing cost is low. Assembly of the foot switch 10 by the elastic member 2 and the microswitch 3 is also easy only by a work such as fitting.

Further, since the stepping elastic member 2 is fitted in the fitting recess 4 of the resin case 1 in a tight water state, water or oil or the like enters the housing recess 7 in which the microswitch 3 is housed. Can be prevented, and high reliability can be obtained. In addition, the stepping elastic member 2 that performs an on / off operation by stepping on the foot,
It is made of rubber or the like, and absorbs by an elastic force even if an excessive force is applied, so that damage of the internal microswitch 3 can be prevented.

Further, in the above embodiment, three foot switches are provided, and the apparatus does not operate unless the main switch 10B is depressed at the same time when the up switch 10A or the down switch 10C is depressed. That is, since the operation is not performed even if only the up switch 10A or the down switch 10C is depressed, malfunction can be prevented.

In the above embodiment, three foot switches 10 are provided on the lifting platform 57. However, the number of foot switches 10 can be changed as appropriate.
Although the foot switch 10 uses the disc-shaped resin case 1 having the flange-shaped mounting portion 5, the resin case 1 may have another shape. For example, the mounting portion 5 and the columnar portion 6 may be continuous without a flange. The planar shape may be a polygonal shape in addition to a circular shape. In this case, when the foot switch 10 is attached to the elevating platform 57, at least the convex surface 25 on the upper side of the stepping elastic member 2 may be fixed so as to protrude from the upper surface of the upper plate 60.

Further, the stepping elastic member 2 has a configuration in which the concave portion 23 in which the cylindrical convex portion 24 is projected is formed on the bottom surface side, but the cylindrical convex portion 24 is integrally formed on the bottom surface without providing the concave portion 23 on the bottom surface side. It is good also as a structure provided protrudingly.

Further, although the spring pin 35 is used for attaching the micro switch 3 to the case 1, the micro switch 3 can be fixed using screws and nuts.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. Would.

[0032]

As described above, in the switch device of the lifting platform according to the present invention, the microswitch is stored in the storage recess of the case, and the fitting projection of the stepping elastic member is fitted in the fitting recess of the case. At least one foot switch is provided on the lifting platform so that the convex surface of the upper surface of the stepping elastic member protrudes from the upper surface of the lifting platform. The convex portion on the bottom surface of the elastic member presses the operation unit on the upper surface of the micro switch facing the inside of the case, and the contact of the micro switch is operated. Therefore, by using the foot switch as an operating means of an elevating device that drives the elevating platform up and down, it is possible to perform the elevating operation of the elevating platform by operating the foot. Even when both hands are not empty, such as by supporting a luggage by riding, it is possible to perform the lifting operation,
Operability can be improved. Further, the foot switch as the operating means is waterproof, has a simple structure, is easy to manufacture, and can be obtained at a low price, so that an inexpensive lifting device for a lifting platform can be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a main part of a switch device of a lifting platform according to an embodiment of the present invention;

FIG. 2 is a front view partially showing the same section.

FIG. 3 is a side view showing a part of the cross section.

FIG. 4 is a plan view of the same.

FIG. 5 is a side view showing the overall configuration of the embodiment.

FIG. 6 is a plan view of the same.

FIG. 7 is a plan view showing a resin case of the foot switch.

FIG. 8 is a bottom view of the same.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 7;

FIG. 10 is a sectional view taken along line XX in FIG. 7;

FIG. 11 is a front sectional view showing a stepping elastic member of the stepping switch.

FIG. 12 is a bottom view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin case 2 Foot step elastic member 3 Micro switch 4 Fitting concave part 5 Mounting part 6 Columnar part 7 Storage concave part 8 Mounting hole 9 Positioning side face 10 Foot switch 10A Up switch 10B Main switch 10C Down switch 21 Fitting convex part 23 Concave part 24 Cylindrical convex part 25 Convex surface 31 Operation part 32 Terminal 51 Lorry 57 57 Elevating platform

Claims (1)

(57) [Scope of request for utility model registration] 1. A case having a fitting recess opening on the upper surface, a housing recess connected to the fitting recess, and an operation unit for operating a contact by pressing on the upper surface, and housed in the housing recess. A micro switch, an upper surface having a convex surface, a bottom surface having a convex portion facing an operation portion of the micro switch, and an outer peripheral portion having a fitting convex portion fitted to the fitting concave portion; At least one foot switch provided with a stepping elastic member that presses the operation portion facing the convex portion when pressed is provided on the lifting platform such that the convex surface projects from the upper surface of the lifting platform. Switch device for lifting platform.