JPH0656092U - Automatic three-stage screw jack - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the head from becoming insufficient, and even if the head is cleared, the weight will not increase and the cost will not increase. [Structure] In the conventional automatic three-stage jack, the ram 1
(1) The bracket 12 fitted on the upper end is made of a thin sheet metal, and the case cylinder 2 is extended to a height limiting the contraction length of the jack, and correspondingly, the screw rod 4, the screw cylinder 10 and the ram 11 are slightly extended. When the jack is deflated, the receiving metal 12 is soaked in the upper part of the case tube 2 so as to be concealed so that a high lift can be obtained. [Effect] It has a feature of gaining a high lift without any special processing, and can stably and reliably operate the range of the high lift that rises low and high without causing any trouble.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of an automatic three-stage screw jack, and more specifically, a concealed type (concealed type) in which a receiver is concealed by being concealed in the upper part of the case cylinder when the jack is retracted to achieve a high lift This relates to an automatic three-stage screw jack.

[0002]

[Prior art]

 In the conventional automatic three-stage jack, when the screw rod 4a is rotated via the bevel gears 7a and 5a transmission mechanism by the handle connected to the handle joint 8a in the retracted state of the jacks shown in FIGS. The screw cylinder 10a screwed to the screw cylinder 10a and the ram 11 screwed to the screw cylinder 10a ascend together as the ram key 17a slides in the inner key groove 16a of the outer ram 14a. When the screw rod 4a further rotates from the state where only the screw cylinder 10a and the ram 11a are fully raised, the female screw portion 18a is locked to the retaining pin 9a so that the screw cylinder 10a is integrated with the screw rod 14a. Therefore, the ram 11a is sequentially raised with respect to the screw cylinder 10a and extends, and at this time, the outer ram 14a is first pulled up by the ram key 7a. Continue to increase elongation, FIG. 1 finally automatic three-stage jack is fully extended, a state of half-cut left side view of FIG.

Next, when contracting from the fully extended state, the handle 10 is turned in the opposite direction to rotate the screw rod 4a in the opposite direction, and first, the screw 10a descends integrally with the ram 11a. When the lower end of the screw cylinder 10a is abutted against the upper surface of the large bevel gear 5a and the screw rod 4a further rotates, the screw cylinder 10a naturally rotates integrally with the screw rod 4a. Therefore, the ram 11a descends sequentially, and at this time, the money receiving 12a also descends simultaneously, and finally, the fully contracted state of the right side of the semi-retracted side of FIG. 1 is restored.

As described above, the conventional automatic three-stage screw jacks have a limit to the lift (lift), but if the limit is exceeded, the outer four-stage type must be used.

[0005]

[Problems to be solved by the device]

 Therefore, the conventional jack was inevitably subject to a shortage of the lift due to its use, and even if the lift was cleared, the weight increased and the cost increased.

[0006]

[Means for Solving the Problems]

 The present invention has been made in order to solve the problems of the prior art, and by modifying the shape of the case cylinder and the receiving member to make it a concealed type (concealed type), special processing is required. The purpose of this is to make it possible to obtain a high lift without any effort and to contribute to improving the performance and function of the jack.

The gist of the present invention is that a ram key provided on the outer periphery of the lower end of a ram screwed into a screw cylinder that is screwed with a screw rod is fitted into the outer keyway of the case key of the case cylinder. In an automatic three-stage jack that is slidably fitted into the inner keyway of the held outer ram, the metal fitting that fits on the upper end of the ram is made of thin sheet metal, and the case cylinder extends at a height that limits the contraction length of the jack. In addition, the screw rod, the screw cylinder, the ram, and the outer ram are each slightly extended correspondingly, so that when the jack is retracted, the receiver will be hidden in the upper part of the case cylinder. There is an automatic three-stage screw jack that is characterized in that Next, the present invention will be described in detail with reference to the following embodiments with reference to FIGS.

First, 1 is a case in which an upper case cylinder 2 is integrated, and a case key 3 bulged inward by sheet metal pressing is provided at the upper part of the case cylinder 2. Reference numeral 4 denotes a screw rod having a male bevel gear 5 fixed to its lower end and having a male screw portion 19 on its outer periphery. The screw rod 4 is vertically provided in the center of the case 1 with a thrust bearing 6 interposed at the lower end. Further, 7 is a small bevel gear that meshes with the large bevel gear 5, and a handle joint 8 is integrally formed at the shaft end thereof. Reference numeral 10 denotes a screw cylinder screwed with the screw rod 4 by screwing the male screw portion 19 of the female screw portion 18 on the lower inner peripheral surface. In addition, 9 is a stop pin which is planted in the male threaded portion 19 of the screw rod 4 so as to block the threaded root portion of the upper end portion thereof. Reference numeral 20 denotes a male screw portion on the outer peripheral surface of the screw cylinder 10. Next, 11 is a ram screwed into the screw cylinder 10 by screwing the male part 20 of the female screw part 21 on the inner surface of the lower part. 17 have been planted. Reference numeral 14 is an outer ram slidably fitted around the outer periphery of the ram 11, and is located at another position (displaced by 90 degrees) and is drilled parallel to the axial direction from the lower end while leaving a part of the upper part. The inner surface key groove 16 and the outer surface key groove 15 which is bored parallel to the axial direction from the upper end with a part of the lower part left are provided. First, the ram key 17 is slidably fitted in the inner key groove 16 and the outer ram 14 is slidably fitted in the ram 11. Next, the case key 3 is slidably fitted in the outer key groove 15, and the outer ram 13 is slidably fitted in the case cylinder 2.

Therefore, in this invention, in the above automatic three-stage jack, the receiving plate 12 fitted on the upper end of the ram 11 is made of a thin sheet metal (13 is a peripheral cylindrical portion), and the case cylinder 2 is a jig. The screw rod 4, the screw cylinder 10, the ram 11 and the outer ram 14 are respectively slightly extended correspondingly to a height that limits the contraction length of the jack, and when the jack is retracted, the receiving member 12 is an upper part in the case cylinder 2. It was constructed so that a high head could be obtained by immersing it in and concealing it.

[0010]

[Operation of the embodiment of the present invention]

 First, when the screw rod 4 is rotated by the handle connected to the handle joint 8 via the bevel gears 7 and 5 transmission mechanism in the jack retracted state of FIG. 3, the screw cylinder 10 and the screw cylinder 10 that are screwed into the screw cylinder 4 are rotated. The ram 11 which is screwed with the ram 10 ascends together as the ram key 17 slides in the inner key groove 16 of the outer ram 14, and only the screw cylinder 10 and the ram 11 are completely lifted. When the screw rod 4 further rotates from the above state, the female screw portion 18 is locked to the stop pin 9 and the screw cylinder 10 rotates integrally with the screw rod 14, so that the ram 11 is rotated. 10, the outer ram 14 is first pulled up by the ram key 17 and then ascends and extends, and finally the automatic three-stage jack is fully extended. State of It made. Next, when the handle is turned in the opposite direction to rotate the screw rod 4 in the opposite direction, the screw cylinder 10 first descends together with the ram 11, and the lower end of the screw cylinder 10 is increased. When the screw rod 4 further rotates after the abutment pressure contact with the upper surface of the bevel gear 5, the screw cylinder 10 naturally rotates integrally with the screw rod 4, and accordingly the ram 11 descends sequentially. At this time, the outer ram 14 also descends at the same time, and finally, the fully contracted state of FIG. 3 is restored.

[0011]

[Effect of device]

 The effects of the present invention will be described below with reference to examples. Now, as shown in FIG. 5, (a) a general automatic three-stage screw jack, (b) a special automatic inner three-stage / outer four-stage screw jack (the one already devised by the present inventor) ), And (c) When the three automatic three-stage (conseal type) screw jacks according to the present invention are compared, the results shown in Table 1 are obtained. As described above, in order to compensate for the conventional drawbacks, the present invention improves the shape of the case cylinder and the receiving member to make it a concealed type, thereby achieving a high lift without any special processing. Can have characteristics. Further, by using the screw jack according to the present invention, there is an excellent effect that the range of the high lift which rises low and high can be stably and reliably operated without causing any trouble.

[0012]

[Table 1]

[Brief description of drawings]

FIG. 1 is a lower half explanatory view of a conventional automatic three-stage screw jack.

FIG. 2 is an upper half explanatory view of a conventional automatic three-stage screw jack.

FIG. 3 is a lower half explanatory view of the automatic three-stage screw jack of the present invention.

FIG. 4 is an upper half explanatory view of the automatic three-stage screw jack of the present invention.

FIG. 5 is a comparative explanatory diagram in the example.

[Explanation of symbols]

 1,1a Case 2,2a Case tube 3,3a Case key 4,4a Screw rod 5,5a Large bevel gear 6,6a Thrust bearing 7,7a Small bevel gear 8,8a Handle joint 9,9a Stop pin 10,10a Screw Cylinder 11,11a Ram 12,12a Receiving 13,13a Circular cylinder 14,14a Outer ram 15,15a Outer keyway 16,16a Inner keyway 17,17a Ramkey 18,18a Female thread 19,20 Male thread 21 Female thread

Claims (1)

[Scope of utility model registration request] Insert the ram key provided on the outer circumference of the lower end of the ram screwed into the screw cylinder that is screwed into the screw rod into the inner key groove of the outer ram in which the case key of the case cylinder is slid into the outer key groove. In this automatic three-stage jack, the metal fitting to be fitted on the upper end of the ram is made of thin sheet metal, and the case cylinder is extended to a height that limits the contraction length of the jack, and the screw rod, screw cylinder and ram are correspondingly The automatic three-stage screw jack is characterized in that each of the jacks is slightly extended so that when the jack is retracted, the receiving money is sunk in the upper part of the case cylinder to be concealed and a high lift is obtained.