JPS6042159B2 - Pantograph type jack - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pantograph type jack for lifting an automobile body.

Jacks as portable equipment for automobiles are always required to reduce the overall volume as much as possible when contracted into a stored and portable state, thereby saving space.

The present invention is an improvement in that the overall length of a pantograph-type automobile jack in the retracted state can be reduced to be shorter than that of conventional jacks.

In order to achieve this purpose, each link of a pantograph type jack consisting of a four-bar chain link mechanism, that is, each arm, is compared to the length of the other pair of arms that are adjacent to each other. Shorten it, for example to about half the length,
Each arm is pivoted to each other so as to match the short arm to form a parallelogram-shaped link mechanism, and a loading platform and a jack pedestal are attached to each end of each long arm. . The invention will be explained with reference to the following figures.
In Figure 1, the lower pedestal 1 and the upper loading platform 2 are made up of four arms, forming a link mechanism as shown in the figure. A pantograph type jack is constructed by connecting them in such a way that the

The four arms are a first arm 3 and a second arm which are longer, and a third arm 5 and a fourth arm 6 which are shorter.

In this embodiment, the lengths of the third and fourth arms are the same as those of the first and second arms.
It is half the length of the arm. Loading platform 2 and first arm 3
The third arm 5 is pivotally connected by a pin 7 at an intermediate position of the first arm 3.
At an intermediate position of the second arm 4, a fourth arm 6 is pivotally attached by a pin 9. The second arm 4 is pivotally attached to the base 1 by a pin 15. A pin 10 that pivotally connects the first arm 3 and the second arm 4 to each other has a screw hole into which a threaded rod 11 is screwed. The pin 12 that pivotally connects the third arm 5 and the fourth arm 6 also has a through hole in a direction perpendicular to the axis, and the right end of the threaded rod 11 has a threaded rod 11 bearing in this through hole. A link 13 fits loosely and contacts a load-bearing collar 14 at the end of the threaded rod 11. One 14 has a nut-like shape and engages with an engaging portion of a rotating handle (not shown). When the above-mentioned rotating handle is engaged with the collar 14 and the threaded rod 11 is rotated, the cargo receiving platform 2 is moved up and down in the figure by the operation of a pantograph type link mechanism.

The pedestal 1 is placed on the ground, and the car body 16 is placed on the loading platform 2.
When supported, the car body can be lifted by turning the threaded rod 11. FIG. 2 shows the state of the jack of the present invention when it is stored. Third arm 5 and fourth arm 6
is half the length of the first arm 3 and the second arm 4, so when it is in the retracted state as shown in Fig. 2, the total length is:
The length is approximately equal to the length of the first arm 3 and the second arm 4. This is a feature of the jack of the present invention, whereas in conventional jacks, the length of each of the third and fourth arms is the same as that of the first arm.
, the second arm, and the pin 7 also serves as the pin 8, and the pin 15 serves as the pin 9. As a result, the total length in the retracted state is approximately twice the length of the first arm 3, as seen from FIG. A car jack can be stored in the trunk of a car or other small space, and like a spare tire, it is an essential tool that has a long standby period, so it is important to be able to reduce its total length when stored to about half of the conventional one. , is significantly advantageous. Note that the first arm 3
The length of the second arm 4 is determined based on the type of vehicle to be used.

Furthermore, the lengths of the third arm 5 and the fourth arm 6 can be set based on the maximum allowable total length when the jack is stored, which is determined by the spatial dimensions of the storage location within the vehicle body. 3. The fourth arms 5 and 6 are the first and second arms 3.
, 4, the load capacity and operability of the jack can be set sufficiently. In the embodiment shown in FIGS. 1 and 2, each arm is made of a thin plate-like material, and one piece is made of two pieces of the same long and thin plate-like material arranged parallel to each other with an interval between them. The arm is constructed so that each pin is supported at both ends by two plate-like materials.

In the embodiment shown in FIGS. 3-5, each arm is made of material with a U-shaped cross section.

Each part is illustrated using a numerical code obtained by adding 100 to the numerical code of the corresponding part in the embodiment of FIG. 1, and redundant explanation will be omitted. As can be seen from FIGS. 4 and 5, the first arm 103
and the second arm 104 have the same cross-sectional shape, and the third arm 105 and the fourth arm 106 have the same cross-sectional shape. Therefore, only by preparing two types of molds for pressing, all four arms can be pressed, which is advantageous in reducing manufacturing costs. In the embodiment shown in FIGS. 6 and 7, each part is illustrated with a numerical code that is the same as the corresponding part in FIG. 1 plus 200. In this embodiment, with the threaded rod held horizontally, the fourth arm 206 is extended, and a pin 206 is placed at the intersection of the extended end and the horizontal line passing through the pin 215.
The pin 20 provided with 0 is slidably engaged in a linear guide groove 21 of the base 201. Therefore, the lengths of the first arm 203 and the fourth arm 206 are equal. 22 in FIG. 7 indicates a water sear. In this embodiment, the loading platform 20
2 is moved up and down perpendicularly to the installation plane of the pedestal 201 to carry the load. That is, the pedestal 201
The loading platform 2 is guided by the guide groove 21 of the loading platform 2 on a controlled trajectory.
02 is configured to move up and down. In the embodiment shown in FIG. 8, the curved guide groove 2 of the pedestal 301 is
3, the pin 24 at the end of the fourth arm 306 is engaged and guided.

In this example, the fourth arm 306 is not extended until its overall length is equal to the first arm 303. However, since the guide groove 23 of the pedestal 301 is curved, the cargo receiving platform 302 can be vertically raised as in the embodiment shown in FIG. The guide groove 23 matches the trajectory when the loading platform 302 is vertically raised. Form it like this. The pedestal 301 and arm 306 can be made smaller than the embodiment shown in FIG. A car jack is used to lift a single part of the car body. Therefore, the entire vehicle body moves like a lever with one of the locations as a fulcrum, and the location supported by the loading platform is raised. Therefore, the loading platform rises while following an arc-shaped trajectory. If this trajectory is given and the guide groove 23 is formed to match the trajectory drawn by the pin 24 when the length of the fourth arm is given, it is possible to lift the vehicle body while the pedestal is stably installed. can. By making the load receiving platform follow a curved trajectory in this manner, the installation of the pedestal is stabilized, so it is possible to prevent the risk that the installation posture of the jack collapses during the lifting operation and the vehicle body falls. Note that the fourth arm 206 of the embodiment of FIGS. 6 and 8,
Each extension portion of 306 may be separate from each of these arms and may be configured to be fixed to each of these arms. In FIG. 8, parts corresponding to the parts of the embodiment shown in FIG. 1 are shown with the same numerical symbols as in FIG. 1 plus 300 to avoid redundant explanation. As explained above, in the jack of the present invention, in a pantograph type jack, among each link, that is, each arm constituting a four-bar chain link mechanism,
By setting one pair of adjacent arms to be shorter than the other pair of arms, the total length in the retracted state can be reduced to approximately half of the conventional length. Furthermore, in the jack of the present invention, the pin attached to the extended end of the extension member integrally connected to the shorter arm is slidably engaged with the guide groove of the base, so that the jack can maintain its posture stably when operating. It can also be easily installed on a vehicle.

Furthermore, since the jack of the present invention can be constructed with four U-shaped cross-sectional arms having only two different widths, it has the advantage of simplifying the pressing process. Further, in the jack of the present invention, the pin attached to the extending end of the extending member integrally connected to the shorter arm is slidably engaged with the guide groove formed on the base side, so that the jack is activated. It can stably support the posture at the time of use, and also makes it easy to attach to a vehicle.

[Brief explanation of the drawing]

Fig. 1 is a front view of one embodiment of the jack of the present invention, Fig. 2 is a front view showing its retracted and stored state, Fig. 3 is a front view of the second embodiment, and Fig. 4 is the - of Fig. 3. ■Cross-sectional view along the line, 5th
The figure is a sectional view taken along the line ■-■ in FIG. 3, FIG. 6 is a front view of the third embodiment, FIG. 7 is a sectional view taken along the line ■-■ in FIG. There is a front view of the fourth embodiment. 1... Pedestal, 2... Loading platform, 3... First arm,
4...Second arm, 5...Third arm, 6...Fourth arm, 11...Threaded rod.

Claims (1)

[Scope of Claims] 1. In a pantograph type jack constructed by a four-bar chain link mechanism in which four arms are pivoted to each other in a quadrilateral shape, the lengths of the upper and lower arms on one side are different from each other. The length of the pair of upper and lower arms on the side is reduced, and one end of each of the shorter arms is pivoted to approximately the middle of each of the longer arms, and each of the shorter arms is connected to each other at the other end. The screws are pivoted by a first pin, each of the longer arms is pivotally connected to each other at one end by a second pin, and the two pins are spaced apart so that the four arms form a quadrilateral shape. A collar 14 on the handle side is fixed to the end of the threaded rod on the threaded end of the threaded rod and the first pin, and a load receiving stand and a pedestal are fixed to the other end of the longer arm. A pantograph-type jack characterized by pivotally connecting and. 2. In a pantograph type jack constructed by a four-bar chain link mechanism in which four arms are pivoted to each other in a quadrilateral shape, the length of the pair of upper and lower arms on one side is the length of the pair of upper and lower arms on the other side. one end of each of the shorter arms is pivotally connected to approximately the middle of each of the longer arms, and each of the shorter arms is connected to each other at the other end by a first pin. each of the longer arms is pivotally connected to each other at one end by a second pin, the two pins are spaced apart, and the four arms are screwed to a threaded rod such that the four arms form a quadrilateral shape; This is an example of screwing together a threaded rod and a first pin, in which the collar on the handle side is fixed to the end of the threaded rod, and a loading platform and a pedestal are pivotally connected to each end of the longer arm, and the pedestal An elongated guide groove is provided in the pedestal, and a pin is attached to the extended end of the extension member integrally connected to the short arm which is pivotally connected to the pedestal. A pantograph type jack characterized by slidably engaging a guide groove. 3. The pantograph jack according to claim 2, wherein the guide groove is a linear guide groove. 4. The pantograph jack according to claim 2, wherein the guide groove is a curved guide groove. 5. In a pantograph type jack constructed by a four-bar chain link mechanism in which four arms are pivoted to each other in a quadrilateral shape, the length of the upper and lower arms on one side is equal to the length of the upper and lower arms on the other side. one end of each of the shorter arms is pivotally connected to approximately the middle of each of the longer arms, and each of the shorter arms is connected to each other at the other end by a first pin. each of the longer arms is pivotally connected to each other at one end by a second pin, the two pins are spaced apart, and the four arms are screwed to a threaded rod such that the four arms form a quadrilateral shape; A handle-side collar is fixed to the end of the threaded rod on the threaded side of the threaded rod and the first pin, and a cargo receiving stand and a pedestal are pivotally connected to each other end of the longer arm, One pair of arms has a U-shaped cross section with the same width, and the other pair of arms have a U-shaped cross section with the same width, and the material plates forming the longer pair of arms are Thickness and said short 1
The short pair of arms are pivotally mounted inside the long pair of arms with a gap in the thickness direction having a length corresponding to the sum of the thicknesses of the material plates forming the pair of arms. Pantograph type jack.