CN203845749U

CN203845749U - Screw jack

Info

Publication number: CN203845749U
Application number: CN201420259833.5U
Authority: CN
Inventors: 李红宾
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-05-21
Filing date: 2014-05-21
Publication date: 2014-09-24
Anticipated expiration: 2024-05-21

Abstract

The utility model discloses a screw jack comprising a support base, a support cylinder, a lifting screw, a bushing, a rotating disc, a ratchet nut and a lifting control structure. The lifting control structure comprises a rotating shaft; a shift rod and a steering cam are mounted at two ends of the rotating shaft respectively; a pair of square pawls distributed in a splayed form are disposed in a mounting recess arranged in the top of the rotating disc; the steering cam controls rotation direction of the ratchet nut by rotating to eject one square pawl. The screw jack is in the screw ratchet design, the design of the ratchet nut and the design of the lifting control structure are ingeniously combined, the lifting screw can ascend and descend easily, operation is very convenient, operating space is reduced, the screw jack is simple in structure and light in weight, the screw jack is available for severe environments and weathers, and the screw jack is highly practical and worthy of popularization.

Description

A kind of screw jack

Technical field

The utility model relates to elevator machinery technical field, relates in particular to a kind of screw jack.

Background technology

At present, existing screw machine jack of the same type, the method for rise is that handle is firmly prolonged to a direction turning handle, drives screw rod to rise; The method lowering is handle to be prolonged to contrary direction firmly rotate, and drives screw rod to fall; Such mechanical jack has following objective shortcoming:

Shortcoming 1, handle rotate the diameter range that can form a larger motion, use inconvenience at narrow space.As jack-up automobile, maybe need to expand in narrow rescue space, it is very inconvenient to use.

Shortcoming 2, when handle is in the position that inconvenience is exerted oneself, can cause firmly difficulty.In the time that firmly handle turns to the end position of backhand, can cause not using power, must take again in addition other end handle, even need to adjust firmly attitude, just can continue to rotate jack handle.

Prior art also has the cantilever carrying form of scissor-like jack, and the weight of such jack is very large, not portable and operation.

In prior art, also have hydraulic jack, jack need to have petrol storage tank like this, thus volume and greatly comparatively speaking, and also under the degree condition of arctic weather-30, hydraulic oil easy freezing, cannot normally use, thereby can lose efficacy.

Utility model content

The utility model, in order to solve the above-mentioned deficiency of prior art, has proposed a kind of screw jack.

In order to solve the problems of the technologies described above, the utility model by the following technical solutions: a kind of screw jack, comprises supporting seat, support tube, expansion screw, lining, rolling disc, ratchet nut and elevating control structure; Wherein, described support tube is vertically inserted into the middle part of described supporting seat; Described expansion screw is by guidepost and be set in lifting screw moving up and down on guidepost and form, and the lower end of described guidepost is fixed on the inner bottom part of described support tube by guide finger; Described lining is fixed by a pin to the upper end of described support tube; In the form of a ring, and this rolling disc becomes upper containing cavities and lower containing cavities by the stopper section that arranges on inner ring surface by rolling disc interior separation to described rolling disc, wherein descend containing cavities to mate and is contained in described lining; Described ratchet nut coupling is housed in the upper containing cavities of described rolling disc, and the middle part of this ratchet nut is threaded connection and is set on described lifting screw.

Described elevating control structure comprises: be located at the mounting groove on rolling disc upper surface, vertically be arranged on the rotating shaft in rolling disc, be arranged on the top of rotating shaft and be placed in the steering cam in mounting groove, the driving lever that is laterally arranged on rotating shaft lower end and stretches out laterally, with a pair of being " eight " font symmetry be arranged on the square ratchet on steering cam both sides, described square ratchet one end is hinged on the bottom of mounting groove, between the end of the other end and the sidewall of mounting groove, compression is connecting a spring, and engage with the external gear of described ratchet nut at the free-ended end angle of described square ratchet, described steering cam backs down wherein the rotatable direction of square ratchet control ratchet nut on one side by rotation.

Further, a side of described rolling disc is horizontally installed with a rotation handle.

Further, the bottom of described rolling disc is provided with one section of gap slot for driving lever activity.

Further, the top of described gap slot is provided with a blind hole, is provided with and holds out against spring and hold out against the hoodle in driving lever in described blind hole.

Further, the upper and lower end face of described rolling disc is all provided with cover plate.

Further, the top of described lifting screw is provided with top.

Compared with prior art, the utility model is simple to operate, stirs as required driving lever and set rising or the decline of lifting screw, use handle can easily rotate rolling disc, firmly few, operational space is little, and does not make the problem of power when operating mode has been avoided traditional jack operation like this, total is simple, lightweight, easy to carry, applicable in rugged environment weather, practical, be worthy to be popularized.

Brief description of the drawings

Fig. 1 is the first structural representation of the present utility model;

Fig. 2 is the second structural representation of the present utility model;

Fig. 3 is birds-eye view of the present utility model;

Fig. 4 is the structural representation of rolling disc of the present utility model.

Detailed description of the invention

Below in conjunction with drawings and Examples, utility model is described in detail.

As shown in Fig. 1,2,3 and 4, the screw jack the utility model proposes, comprise supporting seat 1, support tube 2, expansion screw 3, lining 4, rolling disc 5, ratchet nut 6 and elevating control structure, one side of rolling disc is horizontally installed with a handle 7 for rotation, wherein, support tube 2 is vertically inserted into the middle part of supporting seat 1; Expansion screw 3 is by guidepost 31 and be set in lifting screw 32 moving up and down on guidepost and form, the lower end of guidepost 31 is fixed on the inner bottom part of support tube 2 by guide finger 33, guidepost 31 is provided with and is provided with along its length the protuberance that restriction lifting screw 32 rotates, like this, lifting screw 32 is merely able to move up and down, can not rotate, the top of lifting screw 32 is provided with top 9.

Lining 4 by pin 41 from the side bolt enter the upper end of support tube, thereby the upper end of support tube forms and supports lining 4, but lining rotates on support tube again.

Rolling disc in the form of a ring, and a circle stopper section 51 has extended internally in the middle part of the inner ring surface of this rolling disc, rolling disc interior separation is become upper containing cavities and lower containing cavities by stopper section like this, rotatable cover is on lining like this, lower containing cavities coupling is contained in lining 4, lining 4 is formed and supports rolling disc 5 by stopper section, and the contact that matches of both sidewalls.

In the upper containing cavities of rolling disc 5, place ratchet nut 6, and the middle part of this ratchet nut is threaded connection and is set on lifting screw 32, the centre that lifting screw is worn whole rolling disc passes, the circumferential rim of ratchet nut 6 is supported in upper containing cavities by stopper section 51, and the upper and lower end face of rolling disc is all provided with cover plate 8.

Elevating control structure comprises the mounting groove 52 of being located on rolling disc upper surface, vertically be arranged on the rotating shaft 53 in rolling disc, be arranged on the top of rotating shaft 53 and be placed in the steering cam 54 in mounting groove, the driving lever 55 that is laterally arranged on rotating shaft lower end and stretch out laterally, with a pair of being " eight " font symmetry be arranged on the square ratchet 56 on steering cam both sides, square ratchet one end is hinged on the bottom of mounting groove, between the sidewall of the end of the other end and mounting groove 52, compression is connecting a spring 57, and engage with the external gear of described ratchet nut at the free-ended end angle of described square ratchet, described steering cam backs down wherein the rotatable direction of square ratchet control ratchet nut on one side by rotation.The bottom of rolling disc is provided with one section of gap slot 58 for driving lever activity.The top of gap slot is provided with a blind hole 59, is provided with and holds out against spring 10 and hold out against the hoodle 11 in driving lever in described blind hole, and hoodle 11 just can be at driving lever when static like this, gives certain predetermincd tension driving lever can not be swung.

Referring to Fig. 4, concrete use step of the present utility model is as follows:

Need to rise jack-up carrier time:

A. forward is stirred driving lever 55, driving lever 55 rotating shafts 53, thus drive steering cam 54 to rotate, steering cam backs down square ratchet 56 on one side, and the square ratchet of another side still engages with ratchet nut 6;

B. use handle 7 rotation rolling disc 5 back and forth, rolling disc 5 is by acting on the square ratchet 56 engaging with ratchet nut 6, be rotated in the forward and drive ratchet nut 6 to rotate, thereby allow lifting screw rise, contrarotation direction ratchet skids on the external gear of ratchet nut.

In like manner, need to decline time:

C. oppositely stir driving lever 55, driving lever driving lever 55 rotating shafts 53, thus drive steering cam 54 to rotate, steering cam backs down the square ratchet 56 of another side, and now other square ratchet engages with the external gear of ratchet nut 6 due to the predetermincd tension effect of spring;

D. use equally handle to rotate back and forth rolling disc 5, drive ratchet nut, lifting screw declines.

Above-described embodiment has only been expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the utility model patent and protection domain should be as the criterion with appended claims.

Claims

1. a screw jack, is characterized in that comprising:

One supporting seat (1);

One support tube (2), described support tube is vertically inserted into the middle part of described supporting seat;

One expansion screw (3), described expansion screw is by guidepost (31) and be set in lifting screw moving up and down (32) on guidepost and form, and the lower end of described guidepost (31) is fixed on the inner bottom part of described support tube (2) by guide finger (33);

One lining (4), described lining is fixed on the upper end of described support tube by pin (41);

One rolling disc (5), in the form of a ring, and this rolling disc becomes upper containing cavities and lower containing cavities by the stopper section (51) that arranges on inner ring surface by rolling disc interior separation to described rolling disc, wherein descend containing cavities to mate and is contained in described lining (4);

One ratchet nut (6), described ratchet nut (6) coupling is housed in the upper containing cavities of described rolling disc (5), and the middle part of this ratchet nut is threaded connection and is set on described lifting screw (32);

With an elevating control structure, described elevating control structure comprises: be located at the mounting groove (52) on rolling disc upper surface, vertically be arranged on the rotating shaft (53) in rolling disc, be arranged on the top of rotating shaft (53) and be placed in the steering cam (54) in mounting groove, the driving lever (55) that is laterally arranged on rotating shaft lower end and stretch out laterally, with a pair of being " eight " font symmetry be arranged on the square ratchet (56) on steering cam both sides, described square ratchet one end is hinged on the bottom of mounting groove, between the sidewall of the end of the other end and mounting groove (52), compression is connecting a spring (57), and engage with the external gear of described ratchet nut at the free-ended end angle of described square ratchet, described steering cam backs down wherein the rotatable direction of square ratchet control ratchet nut on one side by rotation.

2. screw jack as claimed in claim 1, is characterized in that: a side of described rolling disc is horizontally installed with a handle for rotation (7).

3. screw jack as claimed in claim 1, is characterized in that: the bottom of described rolling disc is provided with one section of gap slot for driving lever activity (58).

4. screw jack as claimed in claim 1, is characterized in that: the top of described gap slot is provided with a blind hole (59), is provided with and holds out against spring (10) and hold out against the hoodle (11) in driving lever in described blind hole.

5. screw jack as claimed in claim 1, is characterized in that: the upper and lower end face of described rolling disc is all provided with cover plate (8).

6. screw jack as claimed in claim 1, is characterized in that: the top of described lifting screw (32) is provided with top (9).