JPH0593694U - Locking plate for hydraulic press - Google Patents

Abstract

(57) [Summary] [Purpose] If the cylinder of a portable hydraulic press is made of titanium alloy for the purpose of weight reduction, there is a risk of breaking the upper jaw of the cylinder. The strong flight output at the time of breaking is reduced and the surrounding safety is secured. [Structure] A locking plate 6 is attached to the side of the base of the hanging jaw where cracks are likely to occur, and the upper and lower parts are fastened to the bifurcated part of the cylinder with bolts 7 and 8, respectively. The bolt hole for the lower bolt 8 of the locking plate 6 is a downward long hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hydraulic press having a cylinder made of titanium alloy, and relates to a locking plate capable of preventing scattering of fragments even when the hook jaw is broken.

[0002]

[Prior Art]

 In a portable hydraulic press, in order to reduce the labor of the operator, some cylinders are made of titanium alloy and have a light weight (for example, actual Kaihei 2-37482). Unlike conventional steel materials, titanium alloys show almost no elongation under repeated stress. For this reason, if the durability is lost after a predetermined number of durable compression cycles, there is a risk of instantaneous breakage. When experiments were conducted on multiple prototypes, the fractures were, of course, all the roots of the top jaws of the bifurcated guide. The energy of the oil under pressure is released all at once, so it jumps out like a bullet. Even if the thickness of the root was increased, some other safety measure was required.

[0003]

[Means for solving the problem]

 Since the breakage is limited to the base of the hanging jaw, bolt the locking plate across the base up and down. To reduce the momentary energy dissipation, the lower hole of the locking plate should be a downward long hole.

[0004]

【Example】

 In the figure, a titanium alloy cylinder 1 is provided with a bifurcated guide at its upper part, and its ends form opposed hooks 1a, 1b. The head cap 2 can be abutted and locked on the hanging jaw. The upper die 3 is mounted on the lower surface of the head cap. At the lower part of the cylinder, the ram 4 is installed so that it can be hydraulically pushed up. The lower die 5 is mounted on the upper surface of the ram. In the embodiment, the locking plate 6 also serves as the handle 6a, and it is fastened to the bifurcated guide by bolts 7 and 8 on the side surface of the hanging jaw. The hole of the lower bolt 8 is a downward elongated hole 8a.

When a crack is generated at the base, the hook jaw tries to pop out against the frictional resistance of the locking plate, or the lower bolt 8 relatively descends along the long hole, and The jumping energy is absorbed by the tightening frictional force. Further, the jumping energy is absorbed and attenuated by the plastic deformation between the upper and lower bolts of the locking plate. Even if the lower bolt 8 breaks through the lower end of the locking plate and separates the hanging jaw, the flying output of the hanging jaw is reduced, so there is no danger to the surroundings.

[0006]

【effect】

 Even if the hook jaw breaks, the frictional resistance and plastic deformation of the locking plate absorb the ejected energy of the fragment, so the fragment does not project strongly and you can work with peace of mind.

[0007]

[Brief description of drawings]

FIG. 1 is a front view of this device.

FIG. 2 is a side view of the vicinity of a locking plate.

[0008]

[Explanation of symbols]

 1 Cylinder 1a, 1b Hook 2 Head cap 3 Upper die 4 Ram 5 Lower die 6 Locking plate 6a Handle 7,8 Bolt

Claims (1)

[Scope of utility model registration request] 1. A cylinder made of a titanium alloy having a bifurcated guide at an upper portion and having a hook jaw facing the top of the guide, a head cap engageable with the hook jaw, and an upper die attached to a lower surface of the head cap. In a hydraulic press consisting of a ram that can be hydraulically pushed up at the bottom of the cylinder and a lower die that is mounted on the top of the ram, it is attached to the side surface of the base of each hanging jaw and can be bolted to the top and bottom of the base. Hook jaw locking plate for hydraulic press with holes facing downward.