1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148 
Main frame members
Page 74
If you've noticed an error in this article please click here to report it so we can fix it.
MACHINE-welded, lightweight, I-section main frame members made in high-tensile steel for use in semi-trailer construction are being offered by an associate company of the Primrose group.
The frames are machine welded to a high standard on an automatic welding machine built by the company, P. D. S. Fabrications Ltd., with the help of British Oxygen Co. Ltd. at a cost of £5,000.
Three basic frame depths are offered as standard. These are I-section beams with the following dimensions. The first has a 16in.-deep by 0.25in. web with 4in. by 0.375in. flanges with the main depth of the beam reduced to 8in. at one end. The second beam has similar dimensions, but employs 0.5in.-thick flanges and has the neck section reduced to 9in. The third beam employs a 20in.-deep web reduced to 9in. in the neck and to I6in. in the area where the running gear would be attached. This also employs 0.5in. flanges.
Beams are constructed from two qualities of steel. The webs are made from material having a tensile strength of 28-29 tons and the flairges from high-tensile 34/35-ton material. An added advantage claimed for the members is that being fabricated from flat plate they provide simpler fixing points to attach the various pieces of equipment that the modern trailer carries.
Initial production figures stand at 10 pairs of frames per week, but later it is hoped to increase this to around 50 pairs per week. Made by: P. D. S. Fabrications Ltd., Woone Lane, Clitheroe, Lancs. Price: Per pair of 281t. long, 16in. by 4in. bY 0.5in., £65. Extra length: £2 3s. per ft. per pair.