JPH0211435Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention mainly relates to a manual pump for a heavy-duty jack, such as a large-capacity hydraulic jack, such as a 30t or 50t jack. .

(b) Conventional technology In this type of conventional jack, the distance between the shaft support position of the operation lever and the plunger and the shaft support position of the operation lever and the link member is fixed, so that the distance between the shaft support position of the operation lever and the link member is fixed. Regardless of the presence or absence of a heavy load, the actuation of the jack was always constant in relation to the actuation of the control lever.

Furthermore, in this type of manual pump, the product of the discharge amount qcm ³ and the generated pressure pKgf/cm ² , T = p・qKg
Since cm is approximately constant based on human ability, when a high pressure is required, the discharge amount must be reduced, and when a large discharge amount is desired, the pressure is lowered.

However, since this type of jack manual pump is usually preset to the discharge amount at high pressure, the operation lever must be operated many times regardless of whether there is a heavy object or not. Ta.

That is, the number of times the operating lever on the pump side is operated to cause the jack side to push up a certain distance is constant regardless of the presence or absence of a load.

(c) Problems to be solved by the invention In conventional manual pumps, which can only be operated under the same conditions both under load and under no load, the jack is placed under a heavy object to reduce the weight. The operation in the no-load state until reaching the object is performed in the same way as in the case of a preset high pressure, which causes a problem of time loss and irritation.

(d) Means to solve the problem The high-low speed switching manual pump of the present invention has plunger 1
a plunger socket 2 connected to the link member 3, a link socket 4 connected to the link member 3, a lever socket 5 passing through the plunger socket 2 and the link socket 4 in series, and an operating lever 6 inserted through the lever socket. and a locking mechanism 5a, 6a provided between the operating lever and the lever socket, and a locking mechanism 5a, 6a provided between the plunger socket and the lever socket by rotation of the lever socket in conjunction with a rotational operation of the operating lever. By means of adjustment mechanisms 2a and 5b that change the position, and a regulating means 7 that does not change the relative position between the link socket and the plunger socket even when the operation lever is rotated, the plunger can be adjusted by rotating the operation lever. The distance between the connecting portion 8 between the plunger and the plunger socket and the connecting portion 9 between the link member and the link socket is adjusted.

(E) Embodiment Now, to describe an embodiment, as shown in the first diagram, a plunger socket 2 is connected to a plunger 1, and a link socket 4 is connected to a link member 3.
A lever socket 5 is provided which penetrates through the sockets 2 and 4 and regulates the relative positions of both sockets 2 and 4. Between the operating lever 6 inserted into the lever socket 5, there is a protrusion 5a provided inside the tip of the lever socket 5 and the operating lever 6. A locking mechanism is provided between the plunger socket 2 and the lever socket 5, consisting of a recess 6a provided on the outside of the tip thereof, and a threaded groove 2a bored on the inner periphery of the plunger socket 2 and an outer periphery of the lever socket 5. An adjustment mechanism consisting of a pin 5b drilled in the lever socket 5 is provided, and by inserting the operating lever 6 into the lever socket 5, the recess 6a of the operating lever 6 and the protrusion 5a of the lever socket 5 are engaged, and the lever socket 5 is operated. Lever 6
This rotation causes the lever socket 5 to rotate together, and this rotation causes the lever socket 5 to rotate along the threaded groove 2a of the plunger socket 2 fixed by the plunger 1 via the pin 5a which moves in position. 5
The lever socket 5 is moved in the vertical direction as shown by the broken line in the figure, and 7 is a snap ring and 8 is a snap spring.
9 is a pivot between the plunger socket 2 and the plunger 1; 9 is a pivot between the link socket 4 and the link member 3; 10 is a pivot between the link member 3 and the base 11; 12 is a cylinder; There is a passage to send hydraulic oil to the jack body and a passage to the tank.

In the pump of the present invention with the above configuration,
Insert the operating lever 6 into the lever socket 5, align its recess 6a with the protrusion 5a, and in this state,
When the operating lever 6 is rotated to the right in the figure, the lever socket 5 is also rotated together with the lever socket 5, and its pin 5b is rotated along the threaded hole 2a, so that the lever socket 5 is advanced to the right in the figure. , moves from the broken line position in the direction of the solid line position, the link socket 4 also moves at the same time, and the position of the pivot support 9 moves to the right.

As a result, the distance l shown in the third figure is extended, the stroke S of the plunger 1 is increased, the discharge amount is increased, and the jacking operation is accelerated.

That is, the shaft support 9 that connects the tip of the operating lever 6 and the link member 3 and the shaft support 8 that connects the operating lever 6 and the plunger 1 are shown in the structural diagram shown in the third figure.
By adjusting the distance l between the plunger 1 and the load, when there is no load, the distance l is lengthened, the operating range S of the plunger 1 is enlarged, and the amount of hydraulic oil discharged is increased, thereby speeding up the operation of the jack. Sometimes it is possible to shorten the distance l and at the same time lengthen the operating distance l ₁ so that the operating force F opposing the pressure P can be made relatively small.

In this case, since the pin 5b can be freely stopped along the threaded groove 2a, the length of the distance l is also proportional to this, and the lever operating force can be selected.

The above is a case of clockwise rotation of the operating lever 6,
It goes without saying that a left rotation is performed in the opposite direction.

FIG. 4 is a side view showing another embodiment of the pump of the present invention, and FIG. 5 is a rear view.

The difference from the previous embodiment in this case is that the operating lever 6
A locking hole 6b is provided to partially overlap the recess 6a, and the protrusion 5a of the lever socket 5 is engaged with the rotation of the operating lever 6, so that the engagement between the operating lever 6 and the lever socket 5 is also prevented in the vertical direction. The operating lever 6 and the lever socket 5 are connected to each other, and the lever socket 5 is fixed to the link socket 4 by welding W, thereby creating a locking mechanism between the operating lever 6 and the lever socket 5. Configure.

Next, lever socket 4 and plunger socket 2
The adjustment mechanism between the two locking grooves 13 and 13' is formed by drilling two parallel locking grooves 13 and 13' at a constant interval d on the inner circumferential surface of the plunger socket 2, and on the outer circumferential surface of the lever socket 5, as shown in FIG. A retaining groove 15 is provided in which a circlip 14 such as the one shown in FIG. The lever socket 5 and the plunger socket 2 are engaged with each other by an expansion fit.

On the other hand, the locking grooves are provided with inclined edges 13a, 13'a, respectively, to facilitate forced movement of the circlip 14 from the locking grooves 13, 13'.

In the manual pump having such a structure, the operating lever 6 is inserted into the lever socket 5, and the recess 6a is aligned and inserted into the protrusion 5a of the lever socket 5 (as shown in the fourth figure), and the lever is engaged by slightly rotating it. The stopper hole 6b enters into the protrusion 5a, and movement in the vertical direction is also prevented.

In this state, if the operating lever 6 is forcibly pushed in and pulled out without rotating, the circlip 14 will be reduced and moved along the inclined edges 13a, 13'a, and the locking groove 13' or 13' will be moved. The lever socket 5 and the plunger socket 2 are once engaged with each other.

As a result, the distance between the pivot supports 8 and 9 changes,
As with the previous example, the high and low speed of the jack can be made variable.

(f) Effects of the invention As described above, according to the invention, the distance between the plunger socket 2 and the link socket 4, in other words, can be changed by pushing in and out of the lever socket 5 after the operating lever 6 is inserted into the lever socket 5. By doing this, the distance l between the shaft supports 8 and 9 can be changed, and the stroke S of the plunger 1 can be made larger, especially when no load is applied, thereby reducing the time loss and feeling of irritation that occur when no load is applied. It has excellent advantages that can be eliminated accurately and has significant practical benefits.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the manual pump of the present invention, Figure 2 is a rear view of the same pump, Figure 3 is a schematic diagram showing the configuration of the pump of the present invention, and Figure 4 is a diagram showing other pumps of the present invention. FIG. 5 is a rear view of the same pump, and FIG. 6 is a plan view of the circlip. 1...Plunger, 2...Plunger socket, 5...Lever socket, 14...Circlip.

Claims (1)

[Scope of utility model registration request] a plunger socket connected to the plunger; a link socket connected to the link member;
It has a lever socket that passes through the plunger socket and the link socket in series, and an operating lever inserted into the lever socket, a locking mechanism provided between the operating lever and the lever socket, and the operating lever. an adjustment mechanism that changes the relative position of the plunger socket and the lever socket by the rotation of the lever socket in response to a rotational operation of the link socket; The distance between the connecting portion between the plunger and the plunger socket and the connecting portion between the link member and the link socket is adjusted by rotating the operating lever using an unchangeable regulating means. High-low speed switching manual pump.