JPS636149Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a jack used for lifting automobiles.

Traditionally, this type of jack was loaded into a car along with other tools, causing a flat tire.
When it becomes necessary to lift the vehicle body for reasons such as changing a tire, the device is taken out of the vehicle, applied to a designated location on the vehicle body, connected with a rod or similar to the screw bolt of the jack, and turned manually. However, this jack requires a large amount of force, so it has the disadvantage that weak people such as female drivers cannot lift the car body.

The present invention aims to solve the above-mentioned drawbacks of the conventional jack by connecting a motorized speed reducer to the threaded bolt of the jack and providing a jack that can be driven by a switch operation.

An embodiment of the present invention will be described below based on the drawings. 1 is a base plate, 2 is four rods, connected in a pantograph shape, and a lower connecting part 3 is connected to the center of the base plate 1. be. Reference numeral 4 denotes a threaded bolt installed between horizontally opposing connecting parts 5 and 6 among the connecting parts of the four rods 2, one end of which is inserted into the connecting part 5 so as to freely rotate, and the other end is inserted into the connecting part 5 so as to freely rotate. The part is the connecting part 6
It is screwed into a screw hole provided in the. 7 is a car body receiving part attached to the upper connecting part 8 of the connecting parts of the four rods 2, and 9 is an electric motor connected to the part of the threaded bolt 4 that is closer to the connecting part 5 than the center part. The reduction gear is designed to have a size that fits in the inner space of the rod 2 when the connecting portion 8 of the rod 2 reaches the lower limit position. 10,1
1 is a connection part 5 between the motorized speed reducer 9 and the rod 2
With a movable arm connected between the parts approaching the rod, the end connected to the motorized speed reducer 9 is attached to the shaft 12, rollers 13 and 14 are attached to the end connected to the rod 2, and rollers 13 and 14 are installed inside the rod 2. The motorized reducer 9 is configured to roll along rails 15 and 16, and is supported so that the motorized reducer 9 itself does not rotate while the rotation of the motorized reducer 9 is being transmitted to the threaded bolt 4. When the rod body 2 moves up and down, it rotates using the shaft attachment part 12 as a fulcrum. 17 is a lead wire, one end of which is connected to a plug 18 that is inserted into an outlet connected to a battery provided inside the automobile, and the other end is connected to a current-carrying terminal of a motorized speed reducer 9. It has been done. 19 is a switch connected to an appropriate position of the lead wire 17, which switches the polarity of the power supply and energizes the motorized reduction gear 9 depending on whether one end of the push button 20 is pressed or the other end is pressed. However, if either end is not pressed, the power is turned off. Limit switches 21 and 22 operate to automatically detect the upper limit position and lower limit position when the rod 2 moves up and down by contact with the movable arm 10, and to stop energizing the motorized speed reducer 9.

The electric jack constructed as described above uses the battery of the automobile as a power source, and by operating the switch 19, the rod body 2 is moved up and down, and the vehicle body can be lifted and lowered from the lifted position.
Note that the rod 2 rises or falls only while the push button 20 of the switch 19 is pressed, and stops when the push button 20 is stopped being pressed. When the rod 2 reaches the upper limit position, even if one end of the push button 20 is kept pressed, the movable arm 10 presses the limit switch 21 to stop the current supply, and the rod 2 stops at the upper limit position. When the other end of the push button 20 is pressed in this state, the polarity of the power source is switched and the rod 2 is energized, so the rod 2 descends and when it reaches the lower limit position, the push button 20
Even if the other end side of 0 is continued, the movable arm 10 presses the limit switch 22 to stop the current supply, and the rod 2 stops at the lower limit position. When one end of the push button 20 is pressed in this state, the rod 2 rises again.

The present invention may also use commercial power as a power source. It may also be configured as a jack that lifts heavy objects other than automobiles.

Since the present invention is configured as described above, the jack can be driven simply by operating the switch, so unlike the conventional jack, the user does not need to apply force, and it is not necessary for the user to apply force, such as a female driver. However, it can easily lift car bodies and other heavy objects, and easily lower them from the lifted position.

Moreover, since the motorized reduction gear is connected to the part of the threaded bolt that passes through the inner space of the rod, the motorized reduction gear is supported by the base plate like the conventional jack described in Publication No. 51-35874. The base plate can be made smaller and lighter, and the bulk of the jack as a whole can be further reduced compared to the conventional jack, making it very convenient for handling, carrying, and storing. Furthermore, since each limit switch is provided to automatically stop the rod at its upper and lower limit positions, it has the advantage of preventing breakdowns and other troubles due to overrun of the rod or motorized speed reducer.

[Brief explanation of the drawing]

Figure 1 is a front view of the electric jack according to the present invention;
FIG. 2 is a cross-sectional view of the main parts of the same jack. 1... Base plate, 2... Rod, 4... Screw bolt,
5, 6...Connection part, 9...Reduction gear with electric motor, 1
7... Lead wire, 18... Plug, 19... Switch, 21, 22... Limit switch.

Claims (1)

[Scope of utility model registration request] The four rods are connected in a punk pattern on the base plate, and threaded bolts are passed between the connecting parts that face each other in the horizontal direction. In the jack configured to move up and down using a connecting portion as a fulcrum, a motorized speed reducer is connected to a portion of the threaded bolt that passes through the inner space of the rod, and the motorized speed reducer has a movable arm. One end of the movable arm is pivoted, and the other end of the movable arm is connected to a roller that is rotatably supported by the rod. A switch is attached to this lead wire to change the polarity of the power supply and energize the motor, and the reducer with the motor is connected to the lead wire at the upper and lower limit positions when the rod moves up and down. An electric jack comprising limit switches attached to each of the movable arms to stop energization of the electric motor.