JP4351972B2 - Pantograph type jack - Google Patents

Description

  The present invention relates to a portable pantograph jack used for exchanging tires of an automobile.

In the conventional pantograph-type jack, each of the other ends of the pair of lower arms whose one end is pivotally attached to the seat plate and each of the other ends of the pair of upper arms whose one end is pivotally attached to the push-up plate, It presents a parallelogram pantograph link mechanism that is pivotally attached to a shaft metal having a support hole and a shaft metal having a female screw hole. One side of the shaft metal is inserted into the support hole, and the other side is a female screw hole. A threaded rod is installed, and one end of the threaded rod, to which the operating joint that locks the rotary drive handle is fixed, is inserted through a thrust bearing into the shaft metal support hole. A stopper projecting radially by caulking is formed on the inner surface of the pantograph link mechanism that has passed through the metal, so that the screw rod can rotate relative to the shaft metal and move in the axial direction. In which it is assembled the ability (e.g., see Patent Document 1).
Further, in the assembling process of the screw rod, a short cylinder is fitted on a side portion of the screw rod that has passed through the shaft metal, and means for fixing the short cylinder to the screw rod by caulking or the like. There is.

Japanese Patent Laid-Open No. 9-240995

  A pantograph-type jack has a threaded rod inserted between both metal shafts in a member constituting a pantograph link mechanism composed of a pair of lower arms and a pair of upper arms when the vehicle is used for tire replacement. In order to prevent an accident from falling off, a protrusion is formed on the inside of the link mechanism of the screw rod inserted into the support hole shaft metal side when assembling the member and the screw rod constituting the pantograph link mechanism as in the above-mentioned literature technique. In other words, since it has undergone a caulking process, it requires caulking machine equipment such as a press machine.

The present invention has been made in view of such circumstances, and its object is provide a pantograph-type jack that unnecessary equipment members constituting the pantograph-type jack, particularly in the assembly of pantograph link member and the threaded rod There is to do.

The other end of the pair of lower arms pivotally attached to the seat plate and the other end of the pair of upper arms pivotally attached to the push-up plate are connected to the operation side connection metal or the operation side connection metal. The other end of the threaded rod with the operating joint fixed to one end is connected to the female threaded hole of the operating side connecting metal of the pantograph link member that is pivotally attached to the operating side connecting metal. A locking claw of a stopper that is screwed through the support hole and is fitted on the operation side connecting metal to a concave engaging peripheral step portion provided on the inner peripheral side portion of the pantograph link member of the screw rod. Is inserted and locked by its elasticity .

A pantograph-type jack according to the present invention includes a pantograph link member having a pantograph link mechanism including an operation side connection metal having a female screw hole and an operation side connection metal having a support hole, and an operation side connection metal. It consists of three members: a stopper to be fitted, and a screw rod that is inserted into the supporting hole of the connecting metal on the operating side and screwed into the female screw hole of the operating side connecting metal, and the stopper is used as the connecting metal on the operating side. in a state where the fitting was, by inserting the threaded rod into bearing bore of the connecting metal, threaded rod engaging pawl of the stopper is in engagement with the engaging circumferential stepped portion of the threaded rod is rotatably and axially immovable caulking from those assembled in the pantograph members, the assembly work of the members constituting the pantograph type jack, when particular assembly of the threaded rod to Of without requiring machinery such as pressing machine, it is possible to assemble simply, this rich in workability is to lead to reduction of costs.

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

  The pantograph jack A in this embodiment is in contact with a pair of lower arms 2 and 2 whose longitudinal ends are pivotally attached to a seat plate 1 serving as an installation base, and a raised body such as a vehicle. Each of the other ends of the pair of upper arms 4, 4 having one end in the longitudinal direction pivoted to the push-up plate 3 to be engaged is pivoted by the operation side connection metal 5 and the operation side connection metal 6. A pantograph link member B exhibiting a parallelogram-shaped pantograph mechanism, a stopper 7 fitted on the operation side connection metal 6, and a screw rod 8 inserted and bridged between the connection metals 5 and 6. Is done.

  One working side connecting metal 5 that pivots the other end of the lower arm 1 and the other end of the upper arm 4 in the pantograph link member B is provided with a female screw hole 5a at the central portion, The operation side connecting metal 6 is provided with a support hole 6a in the central portion, and the stopper 7 fitted to the operation side connecting metal 6 is substantially open in the side view opened by an elastic plate material. One of the vertical pieces 7a facing each other has a lower edge bent slightly inward, and an insertion hole 7b of a screw rod 8 is provided in the central portion, while the other vertical piece 7c has The engaging claw 7d is formed at the central portion so as to be bent outward and downward, and the engagement pieces 7e and 7e with the lower edge slightly bent inward are provided on both sides thereof. (Fig. 5a).

  Other examples of the stopper 7 include a mode in which a pair of engagement pieces 7f and 7f having a distance enough to pass through the screw rod 8 are formed instead of the insertion hole 7b (FIG. 5B), In place of the claw 7d and the engaging piece 7e, the insertion claw 7g and the claw claw 7d formed by bending the upper side part thereof (FIG. 5C) and the claw claw respectively on the upper and lower side parts of the insertion angle hole 7g There is an embodiment in which 7d and 7d are formed (FIG. 5D).

  The screw rod 8 may have a male screw formed over its entire length, but in this example, a male screw 8a is formed from a substantially central portion to one end, and the other end has a rotation shaft drive handle ( An operation joint 8b for locking (not shown) is fixed, and a thrust bearing 9 is fitted adjacent to the operation joint 8b. A concave engaging circumferential step 8c is formed.

  The pantograph-type jack A in this example is formed by assembling the three members of the pantograph link member B, the stopper 7 and the screw rod 8. When the three members are assembled, the pantograph link member B Is inserted into the connecting metal 6 on the operation side so that the locking claw 7d side of the stopper 7 faces the inner side of the link mechanism from the lower open portion, and the support hole 6a of the connecting metal 6 and the insertion hole of the stopper 7 7b is aligned, and the tip of the male screw 8a side of the screw rod 8 is inserted into the outer side (link mechanism outer side) so that the side surface of the thrust bearing 9 contacts the vertical piece 7a of the stopper 7 fitted to the connecting metal 6. The pan that has passed through the connecting metal 6 of the threaded rod 8 by screwing the male threaded portion 8a into the female threaded hole 5a of the opposite working side connecting metal 5 while pushing until contact. The front end of the engaging claw 7d of the stopper 7 enters and is engaged with the engaging circumferential step 8c formed on the inner side of the graph link mechanism by its elasticity, so that the screw rod 8 is engaged with the operation side. It is assembled to the connecting metal 6 so as to be rotatable and immovable in the axial direction.

  The pantograph-type jack A in the embodiment includes a pantograph link member B exhibiting a pantograph link mechanism including an operating side connecting metal 5 having a female screw hole 5a and an operating side connecting metal 6 having a support hole 6a, and an operation. Three members of a screw rod 8 that is inserted into the stopper hole 7 fitted to the connection metal 6 on the side and the support hole 6a of the connection metal 6 on the operation side and screwed into the female screw hole 5a of the connection metal 5 on the operation side The stopper claw 7d of the stopper 7 is inserted into the threaded rod 8 by inserting the threaded rod 8 into the support hole 6a of the coupling metal 6 in a state where the stopper 7 is fitted to the coupling metal 6 on the operation side. Since this is engaged with the engaging peripheral step 8c, the press for caulking when assembling the members constituting the pantograph jack, particularly when assembling the screw rod Without requiring machinery such, it is possible to assemble simply, this rich in workability is to lead to reduction of costs.

The front view which shows each structural member before the assembly | attachment of a pantograph type jack. The partially cutaway front view of the assembled pantograph type jack. The partially expanded sectional view of FIG. XX sectional drawing of FIG. The perspective view of a stopper.

Explanation of symbols

A Pantograph type jack B Pantograph link member 1 Bottom plate 2 Lower arm 3 Push-up plate 4 Upper arm 5 Operating side connection metal 5a Female thread hole 6 Operation side connection metal 6a Bearing hole 7 Stopper 7b Insertion hole 7d Locking claw 8 Screw rod 8a Male thread 8b Operation joint 8c Engaging circumferential step 9 Thrust bearing

Claims (1)

The other end of the pair of lower arms pivotally attached to the seat plate and the other end of the pair of upper arms pivotally attached to the push-up plate are connected to the operation side connection metal or the operation side connection metal. The other end of the threaded rod with the operating joint fixed to one end is connected to the female threaded hole of the operating side connecting metal of the pantograph link member having a pantograph mechanism which is pivotally attached to the operating side connecting metal. A locking claw of a stopper that is screwed through the support hole and is fitted on the operation side connecting metal to a concave engaging peripheral step portion provided on the inner peripheral side portion of the pantograph link member of the screw rod. Is a pantograph-type jack that is locked in due to its elasticity.

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