Search

JP-2026075478-A - jack

JP2026075478AJP 2026075478 AJP2026075478 AJP 2026075478AJP-2026075478-A

Abstract

[Problem] In a jack that lifts an object by inflating a bag, the bag needs to be stored easily and stably. [Solution] The jack is for lifting an object and comprises a core body that is rotatable around an axis and to which a rotational moment is applied, a bag body having a fluid inlet and stored in a roll shape around the core body, which expands and unfolds upon the introduction of fluid to lift the object relative to the support surface, and a guide member positioned at a distance from the axis of the core body and in contact with the bag body to suppress the rotation of the bag body around the core body. [Selection Diagram] Figure 3

Inventors

  • 釘本 恒
  • 金子 貴範
  • 栗林 卓也
  • 阿部 竜也
  • 松浦 格
  • 野田 新一郎

Assignees

  • 株式会社豊田中央研究所
  • トヨタ自動車株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (8)

  1. A jack used to lift an object, A core body that is rotatable around an axis and to which a rotational moment is applied, A bag having a fluid inlet, which is stored in a roll shape around the core, expands and unfolds upon the introduction of fluid to lift the object relative to the support surface, A guide member is positioned at a distance from the axis of the core body and in contact with the bag body to suppress the rotation of the bag body around the core body, A jack that has [this feature].
  2. The jack according to claim 1, comprising: a first airtight bag body provided with the fluid inlet; and a second bag body having higher strength than the first bag body and containing the first bag body.
  3. The jack according to claim 2, wherein the second bag has an open edge on the side that is fixed to the core body.
  4. The jack according to claim 2, wherein the side of the second bag that is fixed to the core is closed.
  5. The fluid inlet is a cylindrical body that penetrates the second bag and has a threaded portion on its outer circumference. The jack according to claim 2, wherein the second bag is fixed to the first bag by a fixing member that is screwed into the threaded portion.
  6. The jack according to claim 2, wherein the internal dimensions of the second bag are less than or equal to the external dimensions of the first bag.
  7. The jack according to any one of claims 1 to 6, wherein the fluid inlet is provided on the leading edge side in the unfolding direction of the bag body.
  8. The jack according to any one of claims 1 to 6, wherein the guide member has a curved portion in cross-sectional view that contacts the bag body.

Description

This disclosure pertains to jacks. As a jack for lifting objects, an air jack equipped with a bag that inflates with the supply of air is known (see Patent Document 1). Japanese Patent Publication No. 2023-173307 This is a side view showing a jack according to one embodiment of the present disclosure.This is a side view showing the state in which fluid is being introduced into the bag of the jack shown in Figure 1.Figure 2 is a side view showing the state in which the object is lifted after fluid has been further introduced into the jack's bag.Figure 3 is a side view showing the state of fluid being discharged from the jack's bag.Figure 1 is a front view of the jack as seen from the front.Figure 1 is a plan view of the jack's bag-shaped body.This is a cross-sectional view along the line 7X-7X in Figure 6, showing only the first bag and the fluid inlet.Figure 6 is a cross-sectional view along the line 7X-7X, showing the first bag and the second bag fixed in place.This is a front view (corresponding to Figure 5) showing a jack according to another embodiment of the present disclosure.This is a side view showing a jack according to another embodiment of the present disclosure.This is a side view showing a jack according to another embodiment of the present disclosure. The embodiments for implementing this disclosure will be described below with reference to the drawings. Components indicated by the same reference numerals in each drawing are considered to be the same or similar components. Note that redundant descriptions and reference numerals in the embodiments described below may be omitted. Furthermore, the drawings used in the following description are schematic, and the dimensional relationships and ratios of the elements shown in the drawings do not necessarily correspond to reality. Also, the dimensional relationships and ratios of the elements do not necessarily correspond between multiple drawings. A jack 20 according to one embodiment of this disclosure is a device for lifting an object 100, as shown in Figures 1 to 3. In other words, the jack 20 is a device positioned between the object 100 and a support surface 200 to separate the object 100 from the support surface 200. Examples of the object 100 include heavy machinery or automobiles. Examples of the support surface 200 include the ground or a building floor. As shown in Figure 1, the jack 20 of this embodiment comprises a core body 30, a bag body 40, and a guide member 50. (Core body) As shown in Figure 5, the core body 30 has a shaft portion 30A and a winding portion 30B. The winding portion 30B is the part that winds the bag body 40 and is provided on the outer circumference of the central part of the shaft portion 30A. Furthermore, the core body 30 is configured to be rotatable around its axis. Specifically, both ends 30C of the shaft portion 30A constituting the core body 30 are rotatably supported by a pair of bearing portions 32. The pair of bearing portions 32 are each fixed to a pair of support frames 34, which are arranged opposite each other in the axial direction of the core body 30 (in other words, the axial direction of the shaft portion 30A). Furthermore, the core body 30 is configured to have a rotational moment (in other words, rotational force, torque) applied to it. Specifically, a rotational moment is applied by a constant-load spring 36, one end of which is fixed to the core body 30. In this embodiment, one end of the constant-load spring 36 is fixed to both ends 30C of the shaft portion 30A that constitutes the core body 30, so that a rotational moment is applied to each end 30C. Also, cylindrical portions 35 are provided on the outer surfaces of the pair of support frames 34. The axis of each cylindrical portion 35 is configured to be parallel to the axis of the core body 30. Each constant-load spring 36 is wound onto each winding portion (so-called bobbin) 37. Each winding portion 37 is then externally mounted on each cylindrical portion 35. This constant-load spring 36 is a spring that has a constant elastic force regardless of its length extended from its natural length. When the bag 40 is unfolded, the core 30 rotates (counterclockwise in Figure 2), and the constant-force spring 36 is pulled out from the cylindrical portion 35 side and wound around the end 30C of the core 30. Conversely, when the bag 40 is retracted, the core 30 rotates in the opposite direction to when it was unfolded (clockwise in Figure 4), and the constant-force spring 36 is wound back towards the cylindrical portion 35 side. In other words, the constant-force spring 36 returns to its original state. The pair of support frames 34 are connected by a connecting member 38. This connecting member 38 connects the upper ends of the pair of support frames 34. In this embodiment, as an example, the connecting member 38 is positioned on the side opposite to the deployment direction of the core body 30. This connecting member 38 constitutes the portion of th