BS 1761:1951

Cooperating organizations
Foreword
Specification
1. Scope
2. Definitions
3. Information to be supplied with inquiry or order
4. Information to be supplied by the manufacturer
5. Compliance with statutory requirements
6. Power unit
7. Service conditions
8. Materials
9. Factor of safety
10. 'Front end' equipment
11. Standard jib length
12. Crawler bearing length
13. Face shovel working range
14. Forward stability
15. Backward stability
16. Lifting capacity and load indicator
17. Slewing
18. Structure
19. Struts, including jibs
20. Working stress in finished precision bolts and set
     screws used in the excavator structure and machinery
21. Working stresses in rivets used in the structure
22. Rotating rollers
23. Mats
24. Splices
25. Welding
26. Travelling on a gradient
27. Steering
28. Controls
29. Guarding
30. Travelling and slewing
31. Rotating and fixed shafts and axles
32. Keys, keyways and splines
33. Gearing and pawls
34. Driving clutches and brakes
35. Wire ropes
36. Rope drums
37. Rope pulleys
38. Pulley and drum grooves
39. Angle of lead
40. Lifting hooks
41. Shackles
42. Lubrication
43. Electrical cables for power circuits
44. Instruction book
45. Driver's cab
46. Testing
47. Painting
48. Identification
Figures
1-7. Types of equipment
8-10. Diagrams illustrating stability formulae
11. Face shovel: dimensions and working ranges
12. Dragline: dimensions and working ranges
13. Drag shovel: dimensions and working ranges
14. Skimmer: dimensions and working ranges
15. Grabbing crane: dimensions and working ranges
16. Lifting crane: dimensions and working ranges
17. Pile driver: dimensions and working ranges
Appendices
A. Information recommended to be supplied with
     inquiry or order
B. Information to be supplied by manufacturer
C. Acts, regulations and orders affecting excavators
     in the United Kingdom
D. Maximum permissible stresses in fastenings
E. List of British standards applicable to materials
     to be used in the manufacture of excavators
F. Design of struts
G. Capacity rating of buckets
Charts
1. Values of maximum permissible axial stresses, Fa
2. Values of Fbc
3. Values of K for steel complying with BS 15 and
     Grade 15 steel tubes complying with BS 1775*
4. Values of K for steel complying with BS 548
5. Values of K for steel complying with BS 968 and
     Grade 20 steel tubes complying with BS 1775*
* BS 1775 'Steel tubes for mechanical, structural and
   general engineering purposes.'

Excavators up to 2½ cubic yards bucket capacity, mounted on tracks, all motions friction-driven. Defines and illustrates face shovels, drag lines, drag shovels, skimmers, grabbing cranes, cranes and pile drivers. Data on safety factors, ability, controls, power units, electrical equipment, testing.