JP3019266U - Screw jack - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce man-hours and reduce weight. [Structure] A case main body 1 is mounted on a bed 2 having a recess 2a in the center thereof, and a thrust bearing 3 having a large bevel gear 5 on which a lower end of a main screw shaft 4 is fixedly erected on the recess 2a is mounted. Further, the large bevel gear 5 is provided with a small bevel gear 6 of a shaft 6a supported by a bearing portion 1a formed integrally with the case body 1.
, And the main screw shaft 4 has an internal screw 8a.
And an auxiliary screw cylinder 8 having a screw 8b screwed on the outer periphery thereof are screwed together, and further, the outer peripheral screw 8b is screwed with a heavy weight inner cylinder 9 having a groove 9b vertically provided on the outer periphery thereof, and a receiving member 11 is provided on the upper portion thereof. Further, the outer tube 10 is bent in a pipe shape in the groove 9b, and both ends thereof are joined to each other so as to project outward and a key portion is provided to be fitted into the groove 1b vertically provided in the case body 1 and prevented from rotating. A screw jack structure in which the engaging portion 10a provided on the inner side is fitted to prevent the inner cylinder 9 from rotating.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screw jack used for lifting a heavy object such as an automobile.

[0002]

[Prior art]

 In the conventional screw jack, the case body of the jack is generally a steel plate structure or an integral structure of FC casting, and the outer cylinder part in contact with the case body is a pipe-shaped part so that it does not rotate. In order to achieve this, the product with keyway processing is widely used.

[0003]

[Problems to be solved by the device]

 In the case of the steel plate case structure, the above-mentioned conventional screw jack requires many man-hours for manufacturing because it is composed of several parts, which leads to an increase in cost and weight in FC casting.

Further, since the outer cylinder part that comes into contact with the case body is keyed, and the rotation is prevented by using the groove, it takes a lot of manufacturing time. It is difficult to reduce the cost by using a thick wall material, and it is difficult to reduce the weight.

[0005]

[Means for Solving the Problems]

 In order to deal with such a problem, the present invention integrally forms the screw jack case body with aluminum casting or hard resin material, and bends the outer cylinder inscribed with the case body into a flat plate with pipe-shaped end faces. The present invention provides a screw jack that aims to reduce the weight by reducing the wall thickness, reduce the number of steps, and reduce the cost by joining and stacking and joining the joints and using this joint as an outward protrusion.

[0006]

[Action]

 A case body 1 integrally molded by aluminum casting or hard resin is fixedly mounted on a bed 2 whose bottom surface in the center is flush with the grounding surface, and further thrust provided in the center recess 2a of the bed 2. A small bevel gear 6 supported by a bearing portion 1a, which is provided integrally with the main bevel gear 5 of the main screw shaft 4 that is connected to the large bevel gear 5 on the bearing 3 and has its lower end upright, and is tilted integrally with the case body 1. And the small bevel gear 6 is rotated via the handle 7 outside the case body 1, the main screw shaft 4 is rotated via the large bevel gear 5, and the rotation of the main screw shaft 4 is rotated. The rotation is transmitted to the inner weight cylinder 9 that engages with the auxiliary screw cylinder 8 through the outer screw cylinder 8 that meshes with the main screw shaft 4 and the outer cylinder 10 that is guided by the case body 1. Guided by the outer cylinder 10 to ascend, and further push up the auxiliary screw cylinder 8 in sequence to sequentially receive the automobile on the receiving money 11. It is to 扛重 the object 扛重 body. That is, the rotation of the outer cylinder 10 is stopped by the case body 1 and the rotation of the heavy inner cylinder 9 is also stopped via the outer cylinder 10. Therefore, the rotation of the main screw shaft 4 is sequentially transmitted to the heavy inner cylinder 9 and received. The object to be capped on the gold 11 is moved up and down.

[0007]

【Example】

 FIG. 1 shows an embodiment of the screw jack according to the present invention, which will be specifically described below with reference to the drawings.

Reference numeral 1 is a jack case body, and the case body 1 is formed of an aluminum casting or a hard resin material in an integrated structure. Reference numeral 2 is a bed formed of steel or the like into a substantially rectangular shape. The center portion of the bed 2 is a recess 2a, and the bottom surface thereof is flush with the ground contact surface W. Is mounted on the bed 2 with rivets or the like.

A thrust bearing 3 is provided in the central recess 2 a of the bed 1, and a large bevel gear 5 is provided on the thrust bearing 3 such that the lower end of the main screw shaft 4 is fixed by a knock or the like to be vertically erected. In addition, the large bevel gear 5 has a small bevel gear 6 of a shaft 6a which is supported by a bearing portion 1a on an inclined line connecting the centers of the large bevel gear 5 formed integrally with the case body 1. It's meshed.

Further, a handle joint 7 is provided at the end of the shaft 6 a of the small bevel gear 6, and external drive is transmitted via the handle joint 7 and rotation is transmitted to the large bevel gear 5 via the small bevel gear 6. .

Further, the main screw shaft 4 is screwed with a screw 8a on the inner lower side and a screw 8a on the lower side of an auxiliary screw cylinder 8 having a screw 8b screwed on the outer periphery, and further the outer peripheral screw 8b is , A screwed inner cylinder 9 provided with a screw 9a on the inner lower side is screwed, and a groove 9b is vertically provided on the outer circumference of the inner cylinder 9 so that the inner cylinder 9 is directed toward the upper inner side of the outer cylinder 10 described later. The driven engagement portion 10a is fitted to prevent the lifted inner cylinder 9 from rotating when moving up and down and to guide it.

On the upper end of the weighted inner cylinder 9, there is rotatably fitted a receiving member 11 for receiving a weighted object such as an automobile. Further, the outer cylinder 10 is formed by bending a flat steel into a pipe shape, superposing flat portions a and b on both ends thereof and performing welding c, and projecting the welding portion toward the outside to form a key portion 10b. In addition, on the other side of the outer cylinder 10, there is an engaging portion 10a which is fitted in a groove 9b provided in the heavy inner cylinder 9 on the upper side and which is driven inward, and which is driven outward on the lower end side. A stopper 10c is provided and locked by a stopper 1c provided on the inner wall of the case body 1 to prevent the outer cylinder 10 from rising and prevent it from coming out.

A key portion 10b provided on a side portion of the outer cylinder 10 is fitted in a groove 1b vertically provided on the inner wall of the case body 1 to stop the rotation of the outer cylinder 10 and rotate the weighted inner cylinder 9. I'm trying to stop

[0014]

[Effect of device]

 As explained above, the number of parts and work can be reduced by integrally forming the case body with aluminum casting or hard resin, and also in the outer cylinder, the flat plate is bent into a pipe shape, and both side ends of the case are bent. The key part is formed by stacking and joining both sides and projecting to the outside.There is no need to provide a key groove, the material can be made thinner, and the manufacturing man-hours can be reduced. When the weight of the automobile itself is called for, parts can be made lighter, and the cost of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of a screw jack according to the present invention.

FIG. 2 is a side view in which a part of the case body is cross-sectioned.

FIG. 3 is a plan view of FIG.

FIG. 4 is a side view of an outer cylinder.

FIG. 5 is a plan view of FIG.

[Explanation of symbols]

 1 Case Main Body 1a Bearing Part 1b Groove 1c Stopper 2 Bed 2a Recess 3 Thrust Bearing 4 Main Screw Shaft 5 Large Bevel Gear 6 Small Bevel Gear 6a Shaft 7 Handle Joint 8 Auxiliary Screw Tube 8a, 8b Threaded Section 9 Engraved Inner Tube 9a Screw Part 9b Groove 10 Outer cylinder 10a Engaging part 10b Key part 10c Withdrawal prevention part 11 Receiving money a, b Flat part

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 27, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

Claims (2)

[Scope of utility model registration request] 1. A large bevel gear in which a lower end of a main screw shaft is fixed and upright via a thrust bearing is placed in the center of a bed having a case main body mounted on an upper portion thereof, and further, the large bevel gear and the outside of the case main body are provided. Engage the small bevel gear that is rotated by the drive means,
Further, it has an outer cylinder that is guided along the case body and guides the heavy inner cylinder, and further, the rotation of the small bevel gear causes the main screw shaft to rotate through the large bevel gear to be covered. A screw jack for stacking a heavy body, characterized in that the case body is integrally cast from aluminum or made of hard resin. 2. A screw jack having an outer cylinder that is guided along the case main body and that guides a heavy inner cylinder. The outer cylinder is formed by bending a flat plate into a pipe shape and joining both end surfaces of the flat plate to each other. Further, a screw jack characterized in that the joint portion is projected outwardly and slidably fitted in a groove vertically provided in the case body to prevent rotation.