 |
|||
|
|
|||
| ||||||||||
|
|  MIL-H-904J
TABLE L Hook throat openings.
Hook with safety device,
1
Hoist rated load, tons
throat opening, inches
(min)
(min)
1/4 - 3/4
3/4
1
29/32
l-1/2
1
2-3
1-1/8
4
1-3/8
5-6
1-5/8
7-12
2-1/16
12-1/2 -14
2-1/4
15-19
2-3/4
20
3
1
2,000 pounds per ton.
33.6 Hoist brake. Hoist construction shall provide for automatic brake operation to secure
a suspended load if the hand chain is released or operating mechanism fails. Lowering shall be
possible only by manual operation of the hoist (hand chain or hand lever). The brake device shall
be self-adjusting for the service life of the brake lining. The brake shall support the required hoist
loads with no evidence of permanent deformation or excessive wear (see 4.7 and 4.7.8.3). The
brake device and brake surfaces shall be protected against the retention of dirt, dust, and water.
33.7 Trolleys (plain and geared).
Trolley requirements shall be as specified in 3.3.7.1
through 3.3.7.7.
3.3.7.1 Wheels. Trolleys shall be provided with at least four steel wheels. Trolleys up to and
including 3-ton capacity shall have wheels of steel with treads hardened to a minimum depth of
0.020 inch. For trolleys over 3-ton capacity, wheels shall be forged or solid steel with treads
hardened to a minimum depth of 0.063 inch. Trolley wheels shall have treads hardened to
minimum 285 Brinell hardness number. Wheels shall be concentric within 0.030 inch, and cast
wheels shall be machined, if necessary, to maintain a concentricity of 0.030 inch. Where the wheel
mounting arrangement is such that the wheels are not canted to the flange of "X" beam (S-section)
trolley track (tapered treads), wheel treads shall be a convex shape to minimize wear. The
operating device for geared trolleys shall be a chain wheel equipped with an endless chain of a
length as specified in 3.3.22. Unless otherwise specified (see 6.2), trolley wheel spacing shall be
for use on applicable standard "I" beam flange size.
33.7.1.1 Wheel axles. Wheel axles shall be made of carbon or alloy steel.
3.3.7.2 Wheel bearings. The trolley wheels shall be equipped with anti-friction bearings. The
wheel bearings shall be protected to exclude foreign matter.
9
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals