US1670470A - Boom for shovel excavators - Google Patents
Boom for shovel excavators Download PDFInfo
- Publication number
- US1670470A US1670470A US759178A US75917824A US1670470A US 1670470 A US1670470 A US 1670470A US 759178 A US759178 A US 759178A US 75917824 A US75917824 A US 75917824A US 1670470 A US1670470 A US 1670470A
- Authority
- US
- United States
- Prior art keywords
- boom
- shovel
- excavator
- base plate
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
- E02F3/382—Connections to the frame; Supports for booms or arms
Definitions
- the object of the ⁇ present invention istoovercomethesediiculties by a novel construction.
- This task is solved bymou'nting the boom rotatably onvthebaseuplate'y which is carriedoscillatorily about ⁇ a horizontal line by a rotative part ⁇ of theexcavator in such inanner that it is adapted tol rotate about its longitudinal axis.
- Figs. 4 and 5 are views similartoFig. 3, showing ⁇ the parts when the boomV has rotated on its longitudinal axis.
- the boom a is mounted rotatively by a pivot pin I) on the base plate c and is provided witli lateral feet d resting on the base plate which itself is connected rotatably about a horizontal axis by end studs e tothe upper truck A of the excavator.
- Bearing plates cl may be attached to the base plate c for allowing the feet d to bear against.
- cavator can rotate-When continuing-the said 55 rotation .may become so large that the rota#k tive parts of theexcavator in reaching such angle, completely lose their impetus by the action of the usual rotation brake (not shown) lpresent in all shovel excavators@ The result of this is, that all injurious overstrainings or stresses are relieved froin't-he shovelbeain, the derrickand the rotary upper-part of the excavator.
- a sudden deadening ⁇ ofthe inertia of rotary parts is thus 65 not necessary,- but retarding pressures are kept within such limits ⁇ that they can be overcome by the usual-rotation brake.y
- booni a may be connectedl with retraction springs, which pull the boom 70 backinto its central position.
- a helical spring g is are rangedfwithin a casing f, one end'ofthe i spring pressing against an end Wall L of the ⁇ ⁇ casing and the other end auainst a dis'kiz', Tt ⁇
- The'fgn spring or springs g niust be so powerful, that they can overcome the friction of the boom feet d on the base plate c or bearing plates d respectively. They increase the effeet of the rotation brake by the fact that 4the 95 spring which is compressed by the rotation of the booin about the pivot pin exerts aV moment of retardation on the rotary parts of the upper truck of the excavator in the saine direction as the rotation brake. spring and the rotation brake must be so diinensioned that the total eect of both parts is not too great.
- the use of one or two springs has the advantage that they hold the boom, even when excavating, in its 105 central ⁇ position.
- the novel construction has not only advantages that are ecient when the shovel is starting to dig, but also such, which are effective while digging.
- Arranging the boom to rotate about its longitudinal axis has moreover the advantage, that on side pressures arising suddenly overstrainings or stresses are avoided, because the rotary part ot' the excavator need not be made to rotate suddenly, but quite by degrees by the gradually increasing pressure ot' the compressed spring, which exerts the rotary moment on the rotary parts of the excavator.
- a boom Vfor shovel excavators coinprising, a base plate journalled oscillatorily about a horizontal axis on a rotary part of the excavator, and a pivot mounting the boom on the base plate for rotation about the longitudinal axis of the boom, and means including a double acting spring and bellcrank levers cooperating therewith for bias ing the boom about its pivot to its central position on the base plate.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Component Parts Of Construction Machinery (AREA)
- Jib Cranes (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE227126X | 1924-01-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1670470A true US1670470A (en) | 1928-05-22 |
Family
ID=5866534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US759178A Expired - Lifetime US1670470A (en) | 1924-01-04 | 1924-12-31 | Boom for shovel excavators |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1670470A (fr) |
| FR (1) | FR590952A (fr) |
| GB (1) | GB227126A (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2426587A (en) * | 1945-10-30 | 1947-09-02 | Koehring Co | Boom shock absorber |
| US2607500A (en) * | 1947-11-03 | 1952-08-19 | Washington Iron Works | Tower yarder assembly |
-
1924
- 1924-12-26 FR FR590952D patent/FR590952A/fr not_active Expired
- 1924-12-31 US US759178A patent/US1670470A/en not_active Expired - Lifetime
-
1925
- 1925-01-05 GB GB300/25A patent/GB227126A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2426587A (en) * | 1945-10-30 | 1947-09-02 | Koehring Co | Boom shock absorber |
| US2607500A (en) * | 1947-11-03 | 1952-08-19 | Washington Iron Works | Tower yarder assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| GB227126A (en) | 1925-06-04 |
| FR590952A (fr) | 1925-06-26 |
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