JPS60130286U - Boom simultaneous expansion and contraction device - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、従前公知の同時伸縮ブームの説明図、第２図
は本考案の１実施例の同時伸縮ブームの説明図、第３図
は第２図のＣ部拡大部である。 １；第１ブーム、２；第２ブーム、３；第３ブ゛　−ム
、４；第４ブーム、５；第１シリンダ、６；第２シリン
ダ、７；縮小用ロープ折り返し案内具、８；滑車、Ａ；
緊張調節部、２０；縮小用ワイヤロープ、３３；伸長用
ロープ折り返し案内具、３２；滑車、Ｂ；緊張調節部、
２８；イΦ長用ワイヤロープ。FIG. 1 is an explanatory diagram of a previously known simultaneous telescopic boom, FIG. 2 is an explanatory diagram of a simultaneous telescopic boom according to an embodiment of the present invention, and FIG. 3 is an enlarged section of section C in FIG. 1; first boom, 2; second boom, 3; third boom, 4; fourth boom, 5; first cylinder, 6; second cylinder, 7; reducing rope folding guide, 8; Pulley, A;
Tension adjustment section, 20; Reduction wire rope, 33; Extension rope folding guide, 32; Pulley, B; Tension adjustment section,
28; Wire rope for AΦ length.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 第１ブームに第２ブームを、第２ブームに第３ブームを
、第３ブームに第４ブームを夫々望遠鏡に伸縮自在に嵌
挿し、前記第１ブームと第２ブーム間に第１シリンダを
、第２ブームと第３ブーム間に第２シリンダを夫々倒立
状に内装配設し、これら第１、第２シリンダのシリンダ
チューブの各基端部を前記第２ブーム、第３ブームの各
基端部に夫々連結固定し、前記第１シリンダのシリンダ
チューブの先端部には縮少用ロープ折り返し案内具を、
前記第２シリンダのシリンダチューブの基端部には左右
一対の滑車を配設し、前記第４ブームの基端部上部外側
にワイヤロープの緊張調節部を設け、この緊張調節部に
一端を止着した縮小用ワイヤロープの中途部を前記滑車
のうちの一方の滑車、前記縮小用ロープ折り返し案内具
、前記滑車のうちの他方の滑車に順次反転折り返しする
ようにかけ回した後その他端を第４ブームに止着すると
共に、前記第２ブームの先端部には伸長用ロープ折り返
し案内具を、前記第３ブームの先端部には左右一対の滑
車を配設し、前記第４ブームの基端部上部外側にワイヤ
ロープの緊張調節部を設け、この緊張調節部に一端を止
着した伸長用ワイヤロープの中途部を前記第３ブームの
滑車のうちの一方あ滑車、前記伸長用ロープ折り返し案
内具、前記第３ブームの滑車のうちの他方の滑車に順次
反転折り返しするようにかけ回した後その他端を第４ブ
ームに止着したことを特徴とするブー−ム同時伸縮装置
。A second boom is telescopically inserted into the telescope, a third boom is inserted into the first boom, a third boom is inserted into the third boom, and a fourth boom is inserted into the telescope, and a first cylinder is inserted between the first boom and the second boom. A second cylinder is internally arranged between the second boom and the third boom in an inverted manner, and each base end of the cylinder tube of the first and second cylinders is connected to each base end of the second boom and the third boom. a reduction rope folding guide at the tip of the cylinder tube of the first cylinder;
A pair of left and right pulleys is disposed at the base end of the cylinder tube of the second cylinder, and a wire rope tension adjustment section is provided outside the upper part of the base end of the fourth boom, and one end is fixed to the tension adjustment section. The middle part of the wire rope for reduction that has been attached is passed around one of the pulleys, the rope folding guide for reduction, and the other pulley of the pulleys, and then the other end is wrapped around the fourth pulley. In addition to being fixed to the boom, an extension rope folding guide is provided at the tip of the second boom, a pair of left and right pulleys is provided at the tip of the third boom, and the base end of the fourth boom is provided with a pair of left and right pulleys. A wire rope tension adjustment section is provided on the outside of the upper part, and the middle part of the extension wire rope with one end fixed to the tension adjustment section is connected to one of the pulleys of the third boom and the extension rope folding guide. A boom simultaneous extension/retraction device characterized in that the third boom is sequentially inverted and folded around the other pulley of the third boom, and then the other end is fixed to the fourth boom.