JPS61277597A - Arm for pantograph type jack - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to an arm for a bank graph jack for lifting automobiles.

A pantograph type jack consists of two upper arms and two lower arms, and one end of each of the upper and lower arms is pivoted with the upper and lower bearings so that they rotate in contact with each other, and the upper arm A load receiver is provided on the shaft-attached bearing part,
A grounding board is attached to the bearing part to which the lower arm is pivoted, and the ends opposite to the ends to which the upper and lower arms are pivoted are pivoted so that both the upper and lower arms are rotatable. An operating rod having a male thread is screwed into one of the pivot points, and a part of the operating rod is rotatably supported at the other pivot point, and the two pivot points are connected to each other. The distance between the two is moved toward and away from each other by a rotational motion given to the operating screw rod, and the accompanying vertical movement of the load receiver is utilized.

This invention attempts to change the contact means for contacting and rotating the upper and lower arms in the pantograph type jack of the above configuration to a cam contact rather than the conventional gear type.

The structure of the contact parts for contacting and rotating the upper and lower arms of the conventional Pantag Type 27 jack is in the form of gears, which are meshed with each other so that each arm can rotate equally. Common. However, due to the demands of the times and the desire to reduce the weight of the entire jack, the manufacturing process of the gear type used as the contact means has become difficult due to the use of thin materials.

In order to solve this difficulty, the gear form of the contact means has been eliminated and the form has been replaced with a cam contact means.
177896) and Japanese Patent Application No. 57-166343 (Japanese Unexamined Patent Publication No. 59-57894).

Problems to be Solved by the Invention The above two inventions were made by the same applicant as the patent applicant of this invention, but in implementing these prior art, it is necessary to In terms of usage, it is assumed that the purpose will not be achieved and there will be dangers, so we have developed a new cam shape, and the opposing cams have different shapes, and each has a driving side and a driven side. It is separated into two parts.

Means for Solving the Problems The configuration shape of the contact portion at one end of each of the upper and lower arms of the present invention is unique, and is one that is allowed by the configuration requirements (dimensions such as length and width) of the other parts of the arm. If so, other types of configurations are unnecessary.

Basically, the shape of the arm used is an inverted U-shape in cross section. That is, a single sheet metal is bent at right angles from the connection part by cold pressing with side plates on both sides of the metal plate through the central connection part, and the rotating contact of the present invention is attached to the same end of the both sides of the metal plate. It is intended to constitute a division.

This rotational contact is not symmetrical, but the role of the formed cam is that one is formed on the driving side and the other is formed on the driven side, and when making contact with the arm of the narrow rod, the driven side is opposite to the driving side. The two sides are in contact with each other, and the driving side can be configured to be in contact with the driven side so as to face the driven side.

In the configuration of this contact portion, the cam shape on the driving side is as follows:
A part of the circumference of a perfect circle drawn around a specific position that is different from the center of rotation of the arm is used as a cam, and the shape of the driven side cam corresponding to this driving side cam is It has a shape approximately similar to a half-warhead shape, and is capable of receiving a rotational contact operation of the main drive cam whose cam side is a part of the circumference of the perfect circle, and transmitting an operation that is the opposite of the rotation operation of the main drive cam. Both types of cams, a driving side cam and a driven side cam, are arranged side by side at one end of one arm.

Next, in describing embodiments of the present invention with reference to the drawings, first, an outline of the configuration of a pantograph type jack will be described as follows.

A shaft hole (
4) In (5), the lower end of the lower arm (7) (7) is supported by shafts (11) (11), and the bearing part (2) is connected to the pressure receiving plate (3) that comes into contact with the bottom of the car. ) Pivotly connect the upper ends of the upper arms (6) (6) to the shaft holes (4) and (5) provided in K with the shafts (Ll)ulυ, and connect the lower ends of the upper arms (6) and the lower arms, respectively. (7) A bearing member (13) is pivotally connected to both sides of the bearing member (13) coaxially with the upper end portion thereof by a pin C13. The unthreaded part of the end of the operating rod I is rotatably supported by the upper arm (6).
and the other upper arm (6) different from the lower arm (7).
) and a lower arm (the upper end of the force) are interposed with a screw bearing housing 9 which is screwed into a male screw part I provided on the operating rod housing and moves forward and backward by rotation of the operating rod I, In a pantograph type jack that is pivotally mounted with a pin α2 to impart rotational motion to a rotational motion transmission unit uQ provided at one end of an operating rod I, the shaft αυ (11) is pivotally coupled to each bearing portion (2). This relates to the contact rolling portions of the upper arms (6) (6) and the lower arms (7) (7).

In the bearing part (2) and the contact part (to) which is pivotally supported by the bearing part (2), which will be described in detail below, the basics of both the grounding board (1) side and the pressure receiving part (3) side are Since their physical structure and function are exactly the same, they are simply referred to as the bearing section (2), and the upper arm (6) and lower arm (6) are also referred to as the bearing section (2).
7) In <7), the technical idea of the main parts is single, so they are collectively referred to simply as arm (8), but the adjacent and opposing arms corresponding to the ecological explanation are designated by the symbol ( 8) Explain in detail.

The cam-shaped contact portion provided at the blade end of each arm (8), which will be described in detail below, is connected to the side pieces (9) (9) forming the arm (8).
- The drive cam QIJ and the four driven cams, each having its own unique shape, are formed in parallel at the blade end. These driving cam C11 and driven cam @ are connected to the arm (8
) to each bearing part (2) (11)
The shaft hole uOuIll of <lυ is set as the basic position.

As mentioned above, the shape of the main drive cam (211) is such that the effective cam side is about 5 or more circumferences of a perfect circle, and the center point (S) is the shaft hole α.
0 center (passing through Q and above the X-axis of the horizontal axis parallel to the connection part (171), and forward of the y-axis of the vertical axis passing through the center of the shaft hole (O) (in the direction of the tip of arm (8) ) is an essential requirement, and its radius is the center of each shaft hole f4 (5) provided in the bearing part (2) which is pivoted at 1'υ. The distance between the positions (set by Q, and the distance (Q approximate %) is set.The lower end of this driving cam (211) is set at the final position slightly above the X-axis, and the connection of the arm (8) is made from this final position. It is formed by a circular line that reaches the bottom surface of the part (1?), but this circular line is a part other than the part where the cam is effective, and the curve configuration is arbitrary.The contact cam side of the opposing arm (8) rotates. The active cam (21) should be formed so that its action does not succeed or fail when it makes contact.The starting end of the main drive cam (21), which has an effective cam side with a circumference of about 5 or so points on a perfect circle, is connected to the arm (8).
) is connected to the upper side of the side piece (9) by a circular line with a certain radius (2) from a point set outside of the circle.

The driven cam, which is installed in parallel with the above-mentioned main driving cam circle, has a shaft hole [1G
The distance from the center (O) of the drive cam (21+) to the most distal point from the y-axis of the vertical axis on the X-axis of the horizontal axis,
In other words, the sum of the radius forming the driving cam CD, the distance between its center (S) and the y-axis, and the set distance between the shaft holes (4) and (5) (approximately the same distance as the remaining distance subtracted from Q). , the isometric curve formed by connecting the same point as the center (S) set on the driving cam CD with a circular arc line is the curve of the effective cam of the driven cam 4, and the shape of the curve is approximately half warhead type. , and from the center (S) and the equal position to the y-axis of the vertical axis
An arm (8) that is parallel to the axis and has a partial pressure formed at the starting end of the driving cam (21) from the y-axis to the upper side of the side piece (9).
Radius (r) equivalent to a certain radius (6) from a point set other than
Connect with the curve formed by
A curved line extending from the shaft to the lower surface of the connecting portion (171) is formed so as not to protrude forward beyond the effective cam side of the X-axis driven cam.

The setting of the shape of the effective cam curve of the driven cam (c) corresponding to the main drive cam 311 set in this way is calculated using the set formula.

In these contact distances between the main drive cam 011 and the driven cam, the length of the effective cam side of the follower cam @ is the main drive cam Q
It is configured to be slightly longer than the length of the effective cam side of No. 11. The difference in the length of the effective cam side between the two is due to the contact finger sliding phenomenon that has the same effect as the amount of shift in the gear when the side of the driven cam receives contact rotational movement, and causes the contact finger sliding phenomenon to occur on the positive and negative sides. This is to prevent positioning and non-acting sliding displacement, and to transmit the movement of contact displacement from the driving cam (211 side) to the driven cam device side.

As described above, the main drive cam QI) and the driven cam @ each cam structure at the contact portion (to) are completed, and the main drive cam C which forms the contact part of the other opposing arm surface! υ
In addition, in order to further improve the contact effect with the driven cam, the side piece (9) is rotated 90 degrees inward with respect to the outer surface of the side piece (9) to increase the contact width while maintaining the desired cam shape as described above. Side piece (9) (Mo)
It is also optional to configure the contact @W dimension to be larger than the material thickness.

In this way, in the arm (8) of the present invention, the shaft I that pivotally connects the arm (8) to the bearing part (2) is attached to the contact rotation part of both side pieces (9) (9) of the blade end. The reference position is the center of the shaft hole Ql drilled to insert the drive cam (21+) into one side piece (9).
) are each formed with a driven cam @ of the shape described above, and when assembling this as a jack, the shaft hole (4) of the bearing part (2) is formed.
, (5) K Each arm (8) (8) is pivotally connected with two shafts (11) (C1l),
The arm (8) (a + tip end contact s ai an) is arranged so that the driven cam 4 of the other arm (8) faces the main driving cam Qυ of one arm (8), and the driven cam ( The other main drive cam (21) is brought into close contact with the other main drive cam (21) facing away from the main drive cam (21).

Function As described above, the two cams forming the contact portions on both sides of the tip of the arm (8) in this invention, namely the driving cam 12υ and the driven cam @, are not related to each other in shape. However, as mentioned above, the arm (8)
When assembling the pantograph jack with the
A book arm (8) (8) is pivotally connected to two shafts (11) (1υ) via one bearing (2), and the two arms (
8) (8) The tip contact portion CA@ is brought into contact with each other, but regarding the contact configuration, the active cam CI! In principle, the opposing sides that are brought into contact are of different shapes, such as the driven cam 1n facing the driven cam 11 and the main driving cam Qυ facing the driven cam Qυ. Assembled in this way, by rotating the operating rod to use the completed pantograph jack, the operation is uniformly transmitted to all arms (8) and leveled, just like the previous pantograph jack. Each arm (8), which was in a state close to , rotates by increasing its angle.

In this rotational movement, the cam side of the main driving cam (2I) is always the same as the cam side of the driven cam of the other arm (8). Since the curvature of each cam side in contact is different, there is no average rolling friction, and the load applied to the open side of the driving cam is transmitted to the side of the driven cam. , Therefore, if we look at the action of only the mutual cams, the main driving cam (from 2υ, the driven cam ^
It becomes a form that transmits that movement to. However, each of the two arms (8) (8) in contact with each other is equipped equally, and the movement of the rotation operation by the operating rod α4 and the sharing of the load during use are on average between the two arms. (8
) (8), and also two arms (8).
) (The main driving cam of each of the 81 + 211 can be rotated at an equal angle with respect to the vertical center line of the pivoted bearing part (2) without fear of unbalanced load on either arm that is in contact with the pressure. Further, the applied load is also kept in balance, and even in the two sets of cams that are in contact with each other, the contact action is averaged by canceling, so that only one side of the cams does not exhibit a sliding phenomenon due to an uneven load.

Effects As described above, by using a perfect circle for the cam shape of one of the active cams (2B) among the cams that contact each other, a circumference of arbitrary length can be used for cam action, and therefore, the pantograph Even if you use a method that slightly exceeds the set lifting range (lifting height and load) as a type jack, it can be used under exactly the same conditions as within the set lifting range, and the conventional gear-shaped There is no risk of the device becoming unusable due to voice distortion, etc., which is seen in structures using contact means, and there is no risk of exhibiting wear phenomena.

In addition, since the gear shape that has traditionally been used as the contact means for the arm requires severe press processing when configuring it, it is unavoidable to use mild steel as the material. Since this invention does not require gear-like formation, it is possible to use thin cemented carbide steel with an equivalent load capacity based on the load capacity of the above-mentioned mild steel, and in that case, each cam side By increasing the contact width W of the jack, it is possible to obtain the set contact pressure, and by using cemented carbide, it is possible to reduce the weight of the entire jack, and by using a thinner material, processing costs can be reduced. In combination, it is characterized by having the effect of being able to provide inexpensive products.

[Brief explanation of drawings]

Figure 1 is a front view of the pantograph jack, Figure 2 is a front view with one of the bearings removed to show the contact state of the main parts of the arm, Figure 3 is a sectional view taken along line I-I in Figure 2, and Figure 4. 5 is a front view of the main part of the arm, and FIG. 5 is a front view of the bearing part. (1)...Grounding board, (2)...Bearing section, (3)...Pressure plate, (4), (5)...Shaft hole, (8)...Arm, (
91...Side plate, (1G...shaft hole, (11)...shaft,
(L...connection part, C?11...actuator cam, (2)...
Driven cam, ((O)... shaft hole (center of 1G, (S)...
Point, (0...distance. Patent applicant Riken Kaki Kogyo Co., Ltd. IIz Figure 5

Claims (1)

[Claims] The shaft is inserted into one end of the side plate which pivots the four arms having a U-shaped cross section that constitute the rhombic link structure of the pantograph jack to the bearing portion of the grounding board and the bearing portion of the pressure receiving plate. A point (S) set above the x-axis of the horizontal axis parallel to the connection part passing through the center (O) of the shaft hole and in front of the y-axis of the vertical axis passing through the center (O). Approximately 1/ in a perfect circle with a certain radius centered on
Distance (C) between two shaft holes drilled for the shaft in the bearing part at the end of the side plate parallel to the side plate on which the main drive cam is formed and parallel to the side plate on which the main drive cam is formed. From the above y
The tip position is a position approximately equivalent to the distance obtained by subtracting the distance from the shaft to the most distal point of the drive cam from the center of the shaft hole, and the point (S) at the center of the drive cam is defined as the tip position. The effective cam curve is a substantially half-warhead-shaped conformal curve formed by connecting the same position point and the above-mentioned tip position with a circular arc line, and the driven cam and the above-mentioned main drive cam are connected to the tip position of one arm. The arm of a pantograph type jack installed in parallel with the.