JPH032558Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a pantograph-type jack used for lifting objects, particularly parts of the body of an automobile.

As shown in FIG. 5, this type of jack is the base of a pair of lower links 10 and 12 that extend laterally to the left and right, that is, to the operating side (handle joint 50 side) and to the non-operating side. The pivot end and the head (load receiving platform) pivot end of the pair of upper links 20 and 22 are connected to the base 30 and the head 4.
The base and head pivot ends of the pair of lower and upper links 10, 12, 20, 22 are pivotally connected via link pivot pins 14, 24 that extend (back and forth) to intersect with each other. Pivot pin Pivot pin A pair of link support pins 18a, 18b, 2 extend parallel to the link pivot pins 14, 24 so as to intersect the base 30 and the head 40 near the pivot portion.
8a, 28b, and the link support pins 18a, 18b, 28 of the base 30 and head 40.
A, 28b and the link pivot pins 14, 24 intersect, respectively, with link support pins 18a, 18b, 2.
A pair of lateral grooves (horizontal holes) 36a, 36b, 46a, 46b capable of supporting and guiding the pair 8a, 28b, and extending downward or upward from a region between the pair of lateral grooves,
It is known to have vertical grooves (vertical holes) 34a, 44a in which the link pivot pins 14, 24 can be guided.

This known device has link pivot pins 14, 24 when extended in the height direction for use with jacks.
The pair of link support pins 18 are lowered or raised reciprocatingly along the vertical grooves 34a, 44a.
a, 18b, 28a, 28b into a pair of horizontal grooves 36
a, 36b, 46a, 46b, and when contracting in the height direction to avoid using the jack, the link pivot pin 1
4, 24 and horizontal grooves 36a, 36b, 46a, 46b
The pair of lower and upper links 10, 12, 20, 22 are constantly moved in a reciprocating manner along the
A pair of link support pins 18a, 18 are attached to the base 30 and the head 40 at a distance from each other in the lateral direction near the pivoting ends of the base 130 and the head 40.
By engaging at two points consisting of b, 28a, and 28b, the posture of the diamond-shaped link mechanism on the base 30 and the head 40 on this link mechanism is maintained in a stable state.

However, in this known jack, when the jack is used at the limit of extension in the height direction,
In particular, as the car body is displaced toward the non-operating side by lifting a part of the body, the lower and upper links are subjected to a large tilting force toward the non-operating side as described above. Since the pair of bases 30 and head 40 are engaged with the pair of link support pins 18a, 18b, 28a, 28b in close proximity, that is, with the spacing between the support engagement points short, stability during use of the jack is achieved. In addition to the problem of insufficient tilting resistance,
Vertical grooves 34a, 44a and horizontal grooves 36a, 36b, 46
a, 46b are the link pivot pins 14, 24 and the link support pin 18, which move at a constant distance from each other.
A, 18b, 28a, 28b must have a considerable length corresponding to the amount of forward or backward movement, so the base 30 and head 40 must be made of thick and high strength materials. This vertical groove 34
Since the height of the base 30 and head 40 must be made considerably high in accordance with the lengths of a and 44a, the height of the jack at its contraction limit in the height direction, that is, when not in use, becomes high, making it difficult to store it. There are problems such as increased space.

The jack according to this invention was devised with the main purpose of solving the problems observed in such known jacks based on the simplest possible structural modification, and is shown in Figs. Figure 2, 3rd
As illustrated in FIG. 4 and FIG. 4, the base and head pivot of a pair of lower links 10, 12 and upper links 20, 22 extending laterally to the operation side (handle joint 50 side) and the non-operation side. The ends of the lower link 12 and the upper link 22 are pivotally connected to the base 30 and the head 40 via link pivot pins 14 and 24 that extend so as not to intersect with each other, and the bases and the upper links of the lower link 12 and the upper link 22 that extend toward the opposite operation side A base pivot pin 16 and a base pivot pin 16 that engage the portion of the head pivot end portion and are adjacent to the link pivot pin pivot portion on the non-operating side and extend parallel to the link pivot pins 14 and 24, respectively. Via the head pivot pin 26,
The base and head pivoting ends of the lower link 10 and the upper link 20, which are pivotally connected to the base 30 and the head 40 and extend toward the operating side, are adjacent to the link pivot pin pivoting portion on the operating side. The link pivot pins 14, 2 are arranged so as to (support) engage the portion and intersect the base 30 and the head 40.
The link support pin 1 of the base 30 and the head 40 is pivotally connected to the base 30 and the head 40 via link support pins 18 and 28 extending parallel to the link support pins 18 and 28 of the base 30 and the head 40, respectively.
Link pivot pins 14 and 24 at the intersection of 8 and 28
(and the link pivot pin pivot portions of the pair of upper and lower links) move up and down through between the base pivot pin 16 and link support pin 18 and between the head pivot pin 26 and link support pin 28. A structural feature is that short lateral grooves (short lateral holes) 36, 46 are provided in which the link support pins 18, 28 can be guided.

In the jack according to this invention, when the jack is extended in the height direction for use, the link pivot pins 14 and 24 are connected to the base 30 and the head 40.
base and head pivot pins 16, 2 adjacent to
6 between the base pivot pin 16 and the link support pin 18 and the head pivot pin 26.
and the link support pin 28, while the link support pins 18, 2
8 reciprocates from the non-operating side to the operating side to the non-operating side along the short lateral grooves 36, 46, and when the link pins 14, 24 are retracted in the height direction for non-use, the link pivot pins 14, 24
However, the above base and head pivot pins 16, 26
The link support pin moves up and down reciprocally through an arcuate path centered on , passing between the base pivot pin 16 and link support pin 18 and between the head pivot pin 26 and link support pin 28. 18, 28
As in the case of extension, the short transverse grooves 36, 46
A pair of lower links 10 and 12 are constantly moved in a reciprocating manner between the non-operating side and the operating side.
and the pivot ends of the upper links 20, 22 at the base 30 and head 40 are connected to base pivot pins 1 laterally spaced apart from the base 30 and head 40.
6, head pivot pin 26, and link support pin 1
8 and 28, expansion and contraction in the height direction is performed.

According to the jack according to this invention, as mentioned above, the link support pins 18 and 28 reciprocate in the horizontal direction along the short lateral grooves 36 and 46 both when the jack is extended in the height direction and when it is contracted. 36,46
The length can be kept fairly short, thereby making the distance between the base pivot pin 16, head pivot pin 26, and support pins 18, 28 considerably large throughout the height of the jack. I can do it. Therefore, according to this jack, in addition to the fact that the base pivot pin 16 and the head pivot pin 26, which are subjected to a large load during use, are substantially integrally engaged with the base 30 and the head 40, , more than sufficient stability during expansion and contraction can be obtained. In addition, the base 30 and the head 40 can be made of a thin material with low strength, especially since only the short lateral grooves 36 and 46 are formed, which allows the length to be considerably shortened as described above. Since it can be made lower than the height, storage space can be reduced.

Generally, as shown in the drawings, the jack of this invention has link pivot pins 14, 24, base pivot pin 16 or head pivot pin 26 and link support pin 18, in an intermediate state corresponding to substantially the middle of the expansion and contraction process. 28 are aligned horizontally, while the link support pins 18, 28 are located at the operation side ends of the short lateral grooves 36, 46 (see Figure 1). 46 (see Fig. 3), and when not in use, the link support pins 18, 28 are located in the short lateral groove 3.
6, 46 (see FIG. 4), the shape is particularly compact and suitable for use.

In addition, in this jack, in order to prevent wear of both engaging parts due to frictional engagement between the link support pins 18, 28 and the short lateral grooves 36, 46, and to suppress increase in operating resistance (operating torque) of the jack, The link support pins 18, 28 can be supported via pin receivers 32, 42 which are laterally swingably attached to the base 30 and head 40. In this case, the base 3 of the pin receivers 32, 42
Generally, the swingable attachment to the pin receivers 32 and 40 is performed by forming the lower ends of the pin receivers 32 and 42 so as to extend laterally in an arc shape with a middle height, as shown in the figure.
Place this lower end on the flat bottom of the bases 30, 40,
This can be done by attaching it so that it can move laterally through the stop pins 38 and the like.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of an embodiment of the jack according to this invention in an intermediate state of expansion and contraction in the height direction, Fig. 2 is a right side view of a part of Fig. 1, Fig. 3, and 4 is a partially cutaway front view of the jack shown in FIG. 1 in a used state and an unused state, respectively, and FIG. 5 is a view similar to FIG. 1 of a known jack. 10, 12... lower link, 14, 24... link pivot pin, 16... base pivot pin, 18,
28... Link support pin, 20, 22... Upper link, 26... Head pivot pin, 30... Base (base), 32, 42... Pin receiver, 36, 46...
Short horizontal groove, 40...head.

Claims (1)

[Scope of utility model registration request] The base pivot ends of the pair of lower links and the head pivot ends of the pair of upper links extending laterally to the operation side and the counter-operation side are extended so as not to cross each of the base and the head. The base pivot end of the lower link and the head pivot end of the upper link, which extend toward the non-operating side, are pivoted via the existing link pivot pins, and the link pivot pins are pivoted to the non-operating side. pivotally connecting each of the laterally adjacent portions to each of the base and the head via each of a base pivot pin and a head pivot pin that engage the portion and extend parallel to the link pivot pin; and engages each of the base pivot end of the lower link and the head pivot end of the upper link, which extend toward the operation side, with the parts that are close to the link pivot pin pivot part on the operation side. It is pivotally connected to each of the base and head via a link support pin extending parallel to the link pivot pin so as to intersect with each of the base and head, and furthermore, the link support pin of each of the base and head is connected to the link support pin. A pantograph comprising a short lateral groove in which a link support pin can be guided so that the link support pin moves vertically between the base pivot pin and the link support pin and between the head pivot pin and the link support pin. Shape-filled.