Tel: +39-(0)521-771605 / 772808
Fax:+39-(0)521-771605
Email: zsassi@tin.it
Web: www.rsadvnet.it/zsassi/

 

Zetasassi
4130 PARMA
Via Maestri Del Lavoro, 5/A
Italy

Clutch Operated Torque Limiting Devices

The torque limiting device is an adjustable component that, when fitted into a mechanic drive, is able to transfer a pre-set torque value: if the set value is exceeded it intervenes by interrupting the kinematic chain thus protecting other components against breaking or damage due to possible overloads.

Both items are economical given their useful and safe nature.

Automatic Tighteners

The tightener is a very simple and efficient device which compensates for chain or belt stretching by keeping tension constant, without the operator having to intervene.


» Automatic Tighteners
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TYPE - 'TO'

The automatic tighteners take up the chain slackening and keep the tension constant, without any operator attending the adjustments. The TO-TA-ET tighteners are designed to last and are made of top quality materials. The maximum operating temperature is 65°C (100°C for the ET model only).N.B.: available on request:
• Food version with studs and spring in stainless steel AISI 304
• Special head shapes

N.B.:Our tighteners are supplied for chains complying to ISO or ASA standards.

 

TO-05-DP1 TO-Testa Tonda TO-Testa OvaleTA
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TYPE- 'ET'

ET tighteners are especially suitable for high temperature operations, which would wear out rubber and plastic materials in a short time.

FEATURES:
• DIECAST LIGHT ALLOY HEAD
• HIGH TENSILE STEEL STUDS
• DIECAST LIGHT ALLOY BASE

ET ETR ET-PU
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TYPE 'TC'

The TC/TCP/TCR series automatic tighteners take up the chain slackening and keep the tension constant, without the operator making adjustments. They are especially characterized by the following main features:

  • working tightening angle greater than 45° in both directions of rotation;
  • no synthetic materials employed; therefore they can operate at temperatures above 100° C (TCP series 65° C max);
  • internal elastic elements made of special steel with extremely high yield point and prestress, so as to maintain the pressure range as constant as possible;
  • easy assembly: they can be screwed to the machine both from outside and inside.

The quality of the materials, care taken in their manufacture, easy operation and low costs make it a profitable, practical and safe product.

TC TCR TC-PU TCP
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TYPE - 'RH'

The RH series automatic tighteners take up the chain slackening and keep the tension constant, without any operator making adjustments. They are especially characterized by the following main features:
working tightening angle greater than 30° in both directions of rotation;
no synthetic materials use: therefore they can operate at temperatures above 65° C;
internal elastic elements with extremely high yield point and prestress, so as to maintain the pressure range as constant as possible;
easy assembly: they can be screwed to the machine both from outside and inside.


The quality of the materials, the care taken in their manufacture, the easy operation and their low cost make it a profitable, practical and safe product.
The values quoted are not binding and are subject to change without notice.
Our automatic chain tighteners offer you the following ADVANTAGES:

  • 23% increase in the chain life
  • 7% reduction in vibrations
  • 12% reduction in noise
  • a reduced chain slackening
    no need for maintenance.


N.B.: the above values are for Your information only and are not binding, as they can change according to the type of lubrificant used, the operating conditions and the state of the machines.

RH RHR RH-PU RHP
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» ADJUSTABLE TIGHTENERS

TYPE 'GA'


Tightening head made of low friction coefficient special wear-proof plastic (dynamic friction coefficient 0.06 on dry steel)
Diecast alloy base
Max operating temperature: 65° C


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TYPE 'ORIENT'

The ORIENT swivelling tightener operates as a fixed device and does not, therefore, have any helical springs or elastomers inside it, offering the added advantage of being simple and lightweight. Its distinguishing feature is that it can be swivelled in any direction, both before and after assembling, should the belt or chain require its tensioning to be adjusted as a result of stretching. This has been made possible thanks to toothing both on the base and on the lever, so that the two parts come into contact every 15° throughout the entire 360° revolution: this results in 24 possible positions between base and lever. These two parts are made of high resistance aluminium alloy. Thanks to the total absence of synthetic materials, the ORIENT can operate at temperatures above 100°C. It is an excellent alternative for those do not require an automatic tightener, but who have, nonetheless, machine positioning and space-related problems.
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TYPE - 'TF'


Tightening head made of low friction coefficient special wear - proof plastic (dynamic friction coefficient 0.06 on dry steel)
Diecast alloy base
Max operating temperature: 65° C


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IDLER SPROCKETS WITH BALL BEARING PULLEY
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» Clutch Operated Torque Limiting Devices

 

The LIMIT clutch-operated torque limiting device is a reliable, high-quality safety device.

It is used to protect the drive from excessive loads which can damage the various units.

When operating normally, the LIMIT limiting device transmits the necessary torque and slides when over loaded.

The torque is regulated simply by turning the lock-nut.
If the torque exceeds the prescribed limits, the drive automatically disconnects the driven unit

 

 

High Resistance Light Alloy»»
Standard Crown Version»»
Type
Max Torque (Nm)
A
B (r6)
C
D
E
F
G
Standard Crown Version
1 spring
2 spring
unfin.
max
min
max
Dp
De
H
teeth
chain pitch
LF51-1
15
50
35
3
12
20
12
3
6
38
66.93
71
5.2
22
3/8" X 7/32"
LF51-2
30
LF71-1
50
70
45
4
12
25
17
4
10
58
89.24
93.8
7
22
1/2" X 5/16"
LF71-2
100

 

»Clutch Operated Torque Limiting Device
««STANDARD CROWN VERSION
Type
Max Torque (Nm)
A
B (r6)
C unfinished
D1
max
E
F
G
H
Standard Crown Version
1 spring
2 spring
min
max
Dp
De
p
z
l
LF 32
6
12
32
20
5
10
10
2
5.5
34
3
40.58
43.4
1/4"
20
2.8
LF 50
15
30
50
35
8
20
11
3
6
35
3
66.93
71
3/8"
22
5.2
LF 63
40
90
63
49.2
10
25
12
5
10
55
4
89.24
93.8
1/2"
22
7
LF 70
50
100
70
45
10
25
17
4
10
55
4
89.24
93.8
1/2"
22
7
LF 85
90
180
85
49.2
15
30
19
5
15
65
4
111.55
118
5/8"
22
8.8
LF 90
100
200
90
60
15
35
19
5
12
60
4
111.55
118
5/8"
22
8.8
LF 115
200
400
115
72
20
45
21
6
15
70
4
145.94
153.9
3/4"
24
10.8
LF 140
400
800
140
85
25
55
24
6
16
80
5
178.48
189.3
1"
22
15.5
LF 170
700
1400
170
100
30
65
29
8
20
95
5
202.98
218.1
1"1/4
20
18

 

»Clutch Operated Torque Limiting Device WITH CHAIN COUPLING (COAXIAL)
 
Type
Max Torque (Nm)
A
C unfinished
D1
max
D2
G
M
N unfinished
P
Q
R
S
non-alignment
1 spring
2 spring
mm
ang.
LFG 50
15
30
50
8
20
30
35
50
12
75.2
57
21
1
0.20
30'
LFG 63
40
90
63
10
25
35
55
70
16
101
85
29
1
0.25
30'
LFG 70
50
100
70
10
25
35
55
70
16
101
85
29
1
0.25
30'
LFG 85
90
180
85
15
30
45
65
90
16
126.3
98.5
32
1.5
0.30
30'
LFG 90
100
200
90
15
35
45
60
90
16
126.3
93.5
32
1.5
0.30
30'
LFG 115
200
400
115
20
45
55
70
110
20
162.1
107.5
36
1.5
0.35
30'
LFG 140
400
800
140
25
55
65
80
130
25
199.6
142
60
2
0.40
30'
LFG 170
700
1400
170
30
65
75
95
140
25
229.4
182.5
85
2.5
0.50
30'


NB// Friction material with no asbestos.

»Clutch Operated Torque Limiting Device WITH SLIP SENSOR

1. Moveable Ring
2. Safety Switch
3. Chain Coupling
4. Torque Limiting Device

The SLIP SENSOR is a device which indicates when the transmission of the torque exceeds the previously inserted value.
If overloading should occur, the spheres come out of their housing forcing the ring to move back(1), which, inturn, activates a proximity sensor (2) or a sefety microswitch. Since the cause of the slip has been eliminated, it is no longer necessary to take the torque limiting device back to its original position. The limiting devices can be supplied in LF type (part 4) or else equipped with LFG (parts 4+3) chain cuppling.

N.B. Attention should be paid to the minimum number of teeth in the crowns for limiting devices with slip sensor.

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