SE541430C2

SE541430C2 - A pressing tool for clamping a clamping device for attaching a fire hose to a fitting

Info

Publication number: SE541430C2
Application number: SE1751531A
Authority: SE
Inventors: Benny Frykholm; Marcus Bergsjö; Mats Bergsjö; Niklas Olsson; Peter Jansson; Reinert Olsson
Original assignee: Mykaa Verktyg Och Mekanik Ab; Werma Ab
Priority date: 2017-12-12
Filing date: 2017-12-12
Publication date: 2019-10-01
Also published as: SE1751531A1

Abstract

The invention relates to a hose clamp pressing tool (1) for the pressing of a fire hose onto a fitting, comprising:a base part (4),two pivotal jaws (2, 3) pivotally anchored at a first end to said base part (4), via pivot axles (5, 6),each of said pivotal jaw (2, 3) having a force applying member (10, 11) at a second end, a plurality of ring segments (7,8,9) arranged inside of said pivotal jaws (2, 3) and base part (4),said ring segments (7,8,9) having inner press faces (70, 80, 90),wherein at least two of said ring segments (7,8) are circumferentially movably arranged in said pivotal jaws (2, 3),wherein each of said inner press faces (70, 80, 90) have the same shape and comprises two arcuate main press surfaces (70 A, 70B) symmetrically arranged in relation to a central groove (70C).

Description

A PRESSING TOOL FOR CLAMPING A CLAMPING DEVICE FOR ATTACHING A FIRE HOSE TO A FITTING TECHNICAL FIELD The present invention relates to a hose clamp pressing tool for the pressing of a fire hose onto a fitting, comprising: a base part, two pivotal jaws pivotally anchored at a first end to said base part, via pivot axles, each of said pivotal jaw having a force applying member at a second end, a plurality of ring segments arranged inside of said pivotal jaws and base part, said ring segments having inner press faces, wherein at least two of said ring segments are circumferentially movably arranged in said pivotal jaws, wherein each of said inner press faces have the same shape and comprises two arcuate main press surfaces symmetrically arranged in relation to a central groove.

BACKGROUND ART Fire hose fittings have high demands in order to safely connect a fire hose to a fitting, by means of clamps. Known tools that are used today use a plurality of radially movable pressing members, wherein a plurality of pressing moments are needed to complete a secure and wholly sealed clamping.

From WO2016062515 a pressing tool is known, mainly intended for connecting pipes by means of pressing, which tool comprises a pressing loop of interlocking elements which are coupled to one another in hinge joints, wherein at the inner sides of the pressing elements, press jaws are displaceably mounted. By the contraction of the pressing loop, the pressing jaws are moved radially inwards and thus effect a corresponding pressing of a pipe wrapped around by the tool. Similar tools are known from CN203592056, KR20120005930, EP2744626, EP32Q9440, EP1535677, EP2323782 and EP1455969.

None of the above mentioned prior art tools fulfil specific needs that are of essence in regard to pressing of clamps for secure fixing of a fire hose to a fitting. Accordingly, there is a need to improve in regard to known prior art, regarding a pressing tool with which particularly uniform radial pressing of clamps for secure fixing of a fire hose to a fitting is feasible.

SUMMARY OF THE INVENTION It is an object of the present invention t ovide a pressing tool with which particularly uniform radial pressing of clamps for secure fixing of a fire hose to a fitting is feasible, and which is easy to handle and relatively simple in its design. This object is achieved by a pressing tool according to claim 1.

Thanks to the use of a pressing tool according to the invention there is achieved tool with which particularly uniform radial pressing of clamps for secure fixing of a fire hose to a fitting is feasible, in an efficient manner.

According to further preferred embodiments of the invention; - The arcuate main press surfaces are flat and that each arcuate main press surfaces along the opposite sides of the groove is terminated by means of a chamfered side surface, which provides the advantage that a beneficial pressing will be obtained, e.g. leaving a smooth surface without sharp edges.

- The main press surfaces at least at one end is terminated by means of a chamfered end surface, which provides the advantage that a beneficial pressing will be obtained, e.g. leaving a smooth surface without sharp edges, - each of said movable ring segments is arranged with a jaw interface comprising two arcuate protruding guide members spanning at least 90°,_each guide member providing two oppositely facing axial guide surfaces and one outer radial arcuate guide surface, which provides the advantage that a beneficial strength and guiding may be achieved, - each of said movable ring segments is arranged with a jaw interface further comprising three inner radial guide surfaces being radially displaced in relation to said outer radial arcuate guide surfaces, which provides a further advantage regarding strength and guiding. - a slot is arranged within said arcuate protruding guide members arranged to enable limited circumferential movement of said movable ring segments, which provides the advantage that a precise control may be achieved thanks to the position and design of the slot, wherein preferably said slots interact with a pin fixed in an axial bore in each pivotal jaw. - the ring segment in the base part is fixedly arranged, which provides an advantage from a cost perspective.

Further advantages will become apparent for the skilled person from the detailed description below.

BRIEF DESCRIPTION OF THE DRAWINGS In the following, the invention will be described in more detail with reference to preferred embodiments and the appended drawings.

Fig. 1 shows a view from above of a hose clamping device according to a preferred embodiment of the invention, in a fully compressed mode, Fig. 2 shows a view from above of a device in Fig. 1, in a fully folded out mode, Fig. 3 shows a view from above of one pivotal jaw according to a preferred embodiment of the invention, Fig. 4 shows the same pivotal jaw in a front side view, Fig. 5 shows the same pivotal jaw as in Fig. 1, in an end side view, Fig. 6 shows a view from above of a moveable ring segment according to a preferred embodiment of the invention, Fig. 7 shows a cross-sectional view along lines A-A in Fig. 6, Fig. 8 shows a view from above of a fixed jaw according to a preferred embodiment of the invention, Fig. 9 shows a frontside view of Fig. 8, Fig. 10 shows a cross-sectional view along line A-A in Fig. 8, and, Fig. 11 shows a partial section of fig 2, comprising a modification.

DETAIFED DESCRIPTION In the figures, there is shown a pressing tool 1 according to the invention, which makes it feasible to securely attach and seal a fire hose clamp (not shown) in one pressing moment. This is done by having two pivoting jaws 2,3, which via pivot axles 5,6 are pivotally anchored at a base part 4. A pressing force may be applied via force applying members 10, 11 in the front portion of the jaws 2,3. At the inside of the jaws 2, 3 there are ring segments 7, 8 which are "floatingly", provided by means of a longitudinal slot 13, which allows for each ring segment 7, 8 to move a limited distance F, circumferentially, in connection with joining. The base part 4 is provided with a fixed ring segment 9.

The ring segments 7, 8, 9 come into direct contact with the clamp during the pressing process and therefore their inner press faces 70, 80, 90 will be impressed on the outer surface of the clamp.

In Fig. 1 there is shown a view from the above of a hose clamping device 1 according to a preferred embodiment of the invention. There is shown a base part 4 and two pivotal jaws 2, 3. In the shown figure the hose clamping device 1 is in its most compressed mode, i.e. wherein the inner ring segments 7, 8, 9 are in full contact with each other at their respective ends. Two ring segments 7, 8, within the pivotal jaws 2, 3, are moveable. The movability of the ring segments 7, 8 is limited thanks to the use of a fixed pin 20, 30 attached to the pivotal jaws 2, 3 interacting with a slot 13 arranged in each one of the moveable ring segments 7, 8. The slot 13 has an extension in the circumferential direction that is substantially larger than the radial extension thereof. The radial extension of the slot 13 substantially corresponds to the diameter of the pin 20, 30. Accordingly, there will be created a space L in the circumferential direction wherein the moveable ring segments 7, 8 may be moved along the arcuate support surfaces (see 21 in Fig. 3) of the moveable jaws 2, 3.

In Fig. 2 the hose clamping device 1 according to the invention is shown in a fully extended mode presenting that each pivotal jaw 2, 3 may be pivoted more than 90° such that the hose clamping device 1 in its fully extended mode basically forms a straight device 1 , whereby the total maximum height h is substantially less than the total height H in its fully compressed mode, which in some applications may provide an advantage in relation to space requirements.

In Fig. 3 there is shown a view from above of the pivotal jaw 2 according to a preferred embodiment of the invention. In the following it will merely be referred to one of the pivotal jaws 2, because they are preferably designed the same. It is shown that there is a hole 50 in the end of the pivotal jaw 2, which hole 50 is intended for the pivotal axle 5. At the outer end, there is positioned a hole 100 for fixing a force applying pin 10. At the inner side of the pivotal jaw 2 there is an arcuate guide interface 21, for support of and guiding of the moveable ring segment 7. There are arranged a plurality of arcuate inner circumferentially extending support surfaces 21A, 21B, 21C and a plurality of outer arcuate circumferentially extending support surfaces 21D, 21E. Substantially in the centre of arcuate interface 21 there is positioned a hole 22 for a stop pin 20. The hole 22 extends axially, in parallel with the axle 5, and at a position intermediate the plurality of the inner and outer arcuate circumferential extending guide surfaces 21A-21E.

In Fig. 4 there is shown a view from a frontside of the pivotal jaw in Fig. 3. Here it is presented that the jaw 2 preferably is made of three plate members 23, 24, 25 and that interface 21 comprises three protruding guide members 210 that provide the inner arcuate circumferential support surfaces 21A-21C. The two outer plate members 23, 25 have one protruding guide member 210 each and also the outer arcuate guide surfaces 21D, 21E, at positions neighbouring to the central plate members 24. Thanks to this design there will be provided also a plurality of axial guide/support surfaces 21F, 21G, 21H, 211, i.e. guide surfaces that extend along the longitudinal extension of the pivotal jaw 2.

In Fig. 5 there is shown a cross-sectional view of the pivotal jaw along the line A-A in Fig. 3.

In Fig. 6 there is shown a view from above of the movable ring segment 7 according to the invention and in Fig 7 a cross sectional view along A-A. Merely one of the movable ring segments 7, 8 will be described since they have exactly the same design. At the outer arcuate side of the ring segment 7 there is an interface 71 that interacts with the interface 21 of the pivotal jaw 2. Corresponding guide surfaces and support surfaces are arranged at the outer arcuate portion within the interface 71 as in the interface 21 of the pivotal jaw 2. Accordingly, there are three support surfaces 71A, 71C, 71D that interact with the inner arcuate guide surfaces 21A-21C of the pivotal jaw 2 and two arcuate support surfaces 71B, 71H that interact with the outer arcuate surfaces 2 ID, 2 IE of the pivotal jaw. Further, there are a plurality of axial guide/support surfaces 71 E, 71F, 71G, 71H, i.e. guide surfaces that extend along the longitudinal extension of the ring segment 7 which interact with the plurality of axial guide/support surfaces 21F, 21G, 21H, 211 of the pivotal jaw 2.

At the inner arcuate side of the ring segment 7 there is an inner press face 70 having two main press surfaces 70 A, 70B symmetrically positioned in relation to a groove 70C. Further, there is an arrangement to improve the slidability of the moveable ring segments 7, 8 in relation to a clamp, by means of chamfered end areas 70’ of the main pressing surfaces 70A, 70B, wherein less than 10° of the end area has reduced thickness by eliminating a wedge shaped volume having a radial thickness x, that preferably may be in the range of 0,1- 1 mm. Further, it may be advantageous to also add a further chamfering (not shown), e.g. of about 45° to eliminate the sharp comers of the segments 7, 8, 9, thereby eliminate the risk that possibly sharp burr will be created between the end edges of the segments, which otherwise may occur when they move into close relationship in the final stage of a pressing operation.

In Fig. 8 there is shown a view from above of the fixed base part 4 according to a preferred embodiment of the invention, wherein the ring segment 9 is fixed, and has an interface 90 exactly the same as that of each moveable ring segment 7, 8.

In Fig. 9 there is shown a front view of the arcuate side thereof, wherein is shown that two plate members 41, 42 at each end interfit with the three plate members 23, 24, 25 of each jaw 2, 3. Preferably one of the plate members 41 is thicker than the other one 42.

In Fig. 10 there is shown a cross-sectional view along lines A-A in Fig. 8, clearly showing the shape of the inner press face 90.

In Fig. 11 there is shown a partial section of the view in fig 2, comprising a modification, by arranging a resilient device 73 to urge the moveable ring segment 7 outwards, i.e. to have them 7, 8 positioned in an outer position, away from the 4 in an unaffected mode. This feature safe guards that the moveable ring segments 7, 8 will always be positioned at their desired outmost position at the start of a pressing operation. Thanks to this feature it is eliminated that any of the moveable ring segments 7, 8 will easily be moved away from the desired starting position of a pressing operation, i.e. at the start it is desired that each moveable ring segment 7, 8 is positioned in its most outward position to enable the desired sliding movement inwardly during the pressing operation.

In Fig 1 the position is shown when the of a pressing operation is terminated and the moveable ring segments 7, 8 have moved all the way inwardly, i.e. the enabled distance L. In Fig. 11 it is shown the starting position, where the fixed pin 20 is in contact with the outer edge of the slot 13, by means of having the resilient device 73 urging the moveable ring segment 7outwardly. This is achieved by having the resilient device 73 fixedly attached to the moveable ring segment 7 and by having it interacting with the edges of a through hole 26 in the jaw 2. Preferably the resilient device 73 is a rodshaped member (e.g. round) in a resilient appropriate material fixed in a hole 74 (with a corresponding shape, e.g. round). When the pressing operation starts the ends 72 of the moveable ring segments 7, 8 will get in contact where after the moveable ring segment 7, 8 are moved inwards. The resilient device 73 will then flex such that some material of the resilient device 73 is deformed/pressed out into the space of the larger hole 26, enabling the moveable ring segment 7 to move inwards.

The skilled person realizes that a large variety of modifications may be performed without the use of inventive skill, departing from the description above, e.g. the use of various shapes and/or materials to achieve a resiliency function as described in connection with Fig. 11. Further it is realised that the jaws and/or fixed part may be produced using less or more plate shaped parts.

Claims

1. A fire hose clamp pressing tool (1) for the pressing of a fire hose onto a fitting, comprising: a base part (4), force applying members (10, 11) and movable segments (7,8,9) having inner press faces (70, 80, 90), wherein each of said inner press faces (70, 80, 90) have the same shape and comprises two arcuate main press surfaces (70A, 70B) symmetrically arranged in relation to a central groove (70C), characterized by, two pivotal jaws (2, 3), wherein each pivotal jaw (2,3) is pivotally anchored at a first end to said base part (4), via pivot axles (5, 6) and having said force applying member (10, 11) at a second end, a plurality of ring segments (7,8,9) arranged inside of said pivotal jaws (2, 3) and base part (4), said ring segments (7,8,9) having inner press faces (70, 80, 90), wherein at least two of said ring segments (7,8) are circumferentially movably arranged in said pivotal jaws (2, 3), and wherein each of said movable ring segments (7,8) is arranged with a jaw interface (71) comprising two arcuate protruding guide members (710, 711), each guide member (710, 711) providing two oppositely facing axial guide surfaces (71E, 71F; 71G, 71H) and one outer radial arcuate guide surface (71B, 711).

2. A hose clamp pressing tool (1) according to claim 1, wherein said arcuate main press surfaces (70 A, 70B) are flat and that each arcuate main press surfaces (70A, 70B) along the opposite sides of the groove (70C) is terminated by means of a chamfered side surface (70D, 70E).

3. A hose clamp pressing tool (1) according to claim 1 or 2, wherein said main press surfaces (70 A, 70B) at least at one end is terminated by means of a chamfered end surface (70’), preferably at both ends.

4. A hose clamp pressing tool (1) according to claim 1, wherein each of said movable ring segments (7,8) is arranged with a jaw interface (71) further comprising three inner radial guide surfaces (71A, 71C, 71D) being radially displaced in relation to said outer radial arcuate guide surfaces (71B, 711).

5. A hose clamp pressing tool (1) according to claim 1, wherein each of said arcuate guide members (710, 711) spans at least 90°, preferably spans substantially equally as each movable ring segments (7,8).

6. A hose clamp pressing tool (1) according to claim 1, 4 or 5, wherein a slot (13) is arranged within said arcuate protruding guide members (710, 711) arranged to enable limited circumferential movement of said movable ring segments (7,8).

7. A hose clamp pressing tool (1) according to claim 6, wherein said slot (13) interact with a pin (20) fixed in an axial bore (22) in each pivotal jaw (2, 3).

8. A hose clamp pressing tool (1) according to any preceding claim, wherein each ring segment (7, 8, 9) spans at least 110°, preferably each ring segment spans 120°.

9. A hose clamp pressing tool (1) according to any preceding claim, wherein the ring segment (9) in the base part (4) is fixedly arranged.

10. A hose clamp pressing tool (1) according to any preceding claim, wherein said movable ring segments (7,8) are urged into an outer position by means of a resilient device (73). 1 1. A hose clamp pressing tool (1) according to claim 10, wherein said resilient device (73) is rod shaped and extends transversally through a plurality of transversal holes (26, 74) of each pivotal jaw (2, 3) and movable ring segment (7,8), wherein preferably the at least on hole (26) in the pivotal jaw (2, 3) has a larger diameter than the at least on hole (74) in the movable ring segment (7,8).