JP2017500181A - Adjustable hand tools - Google Patents

Abstract

The present invention relates to a hand tool 1, which comprises a first element 2 and a second element 32 arranged to swivel about a pivot axis 30, wherein the first and second elements are each The active part 4, 34 and the grip part 6, 36, wherein the active part and the grip part of the first and / or second element are arranged to pivot about the adjustment pivot axis 10, 42, And locking means 12, 44 are provided that allow the grip portions to be locked in place relative to each other.

Description

  The present invention relates to an adjustable hand tool, in particular a single scissor, large shear or forceps.

  Hand tools, such as scissors and all types of forceps, typically comprise two rigid elements connected to one another for rotation about a rotation axis. Both rigid elements are provided with a grip part at one outer end and an active part at the other outer end. In the case of scissors, this active part comprises a blade part, also called a cutting blade, and in the case of forceps, the active part can be provided with a jaw.

  For operations that need to be operated accurately and / or at different positions, such as when working for hairdressers and surgeons, hand tools are available at an angle in the rigid element. In such a case, the user may have a plurality of hand tools with varying angles, for example a first straight continuous hand tool, and a second hand tool with an angle between the handle and the active part of 30 °. A third hand tool with an angle between the handle and the active part of 45 ° is available.

  The user selects the desired angle depending on the desired posture and the desired field of view of the object being handled by the hand tool. The ability to change the tool allows the user to take a comfortable and healthy posture, and good visibility contributes to the quality of manual work.

  Especially if the user also needs different types of hand tools in addition to the desired angle variation, the user will soon have a large number of hand tools.

  It is not uncommon for a professional hairdresser to have 4 scissors at their discretion, that is, a pair of normal scissors and a pair of scissors at different angles. Similarly, surgeons often have a significant number of different hand tools at their discretion.

  Hand tools such as professional scissors and surgical forceps are generally very expensive because they are manufactured from very premium materials. A cost price of several hundred euros per hand tool is not uncommon.

  The present invention aims to provide a hand tool of the above kind which does not cause, or at least not so much, the above drawbacks.

  The object comprises a first element and a second element arranged to pivot about a pivot axis, the first and second elements each comprising an active part and a grip part, The active part and the grip part of the second element are arranged to pivot about the adjusting pivot axis and are provided with locking means that allow the active part and the grip part to be locked in place relative to each other Implemented according to the present invention by a tool.

  The active part and the grip part of one or both elements of the hand tool can be adjusted relative to each other and can be locked in different positions, so that the hand tool can be adjusted to the most comfortable position for the user.

  A further advantage of each element comprising a separate active part and grip part is that they can be disassembled. This provides an opportunity to replace one of the parts.

  A particularly advantageous preferred embodiment is obtained when the active part and the grip part of both the first element and the second element are adjustable around an adjustment pivot axis. Given the adjustable form, both elements can be adjusted together in a given direction, thereby increasing the adjustment range. Both grip portions must eventually be located within each other's range to handle them. For example, the first grip portion is operated by the user's thumb, and the second grip portion is operated by another finger of the same hand of the user.

  According to a further preferred embodiment, the locking means are arranged on the grip part or on the other part of the active part and at least two recesses arranged on the active part and between the locked position and the released position. A projecting member movable between the projecting member, in the locked position, the projecting member engages one of the recesses, and in the released position, the projecting member is such that the active part and the grip part are adjustable relative to each other. To release the recess. By engaging the protruding member in the recess, a snug and thus operationally secure lock is obtained. The snug engagement reliably prevents unwanted adjustment due to slipping, which is a risk due to the lock being based on friction. Undesirable adjustments in use can cause undesirable results, for example, a hairdresser or surgeon accidentally cuts accidentally.

  According to yet another preferred embodiment, at least two recesses are arranged in the grip part and the protruding member is arranged on the active part, so that the active part can remain largely without means. The user thereby maintains a good view of what he is doing. The hairdresser can, for example, look at the unobstructed hair along the cutting edge. The protruding member is movable again between the locked position and the released position.

  Moreover, sufficient space for energizing a protrusion member with a leaf | plate spring arises by arrange | positioning on a grip part. This is a further preferred embodiment.

  The protruding member is preferably biased by the spring so that the protruding member is pressed into the locked position by the spring. This spring is preferably a leaf spring. Although leaf springs require more space and may therefore feel inferior to smaller coil springs, leaf springs are a preferred embodiment due to their low tendency to block. Where the leaf spring remains clean, if the hand tool is provided with a hairdresser's scissors, a portion of the hair can easily be pinched by the coil spring. Leaf springs provide benefits when hygiene is important, as is the case with medical hand tools.

  In accordance with yet another preferred embodiment, if the protruding member comprises a guide portion and / or a locking portion having a rotationally asymmetric cross section, the protruding member is prevented from being rotatable about its longitudinal direction. Thus, it is realized that the locking part of the protruding member always remains in a position where it can be arranged to engage with the selected recess in the locking position, even when temporarily in the releasing position Is possible.

  A further advantageous embodiment is obtained when the protruding member comprises a locking part having a chamfered configuration. With this chamfered configuration, the projecting member biased by the spring will always be guided into a close engagement with the recess.

  Although it is possible to envisage only a projecting member comprising a chamfered form and a tubular recess that is closely engaged to the edge thereof by a chamfered projecting member, the projection member according to a further preferred embodiment When the chamfered form cooperating with the chamfered portion is provided in the recess, an increase in the contact surface area between the chamfered protruding member and the recess is obtained.

  According to yet another preferred embodiment, the protruding member comprises a press part, and the chamfered form is thicker in the direction away from the press part. By pressing the press part with a finger, the user can release the spring bias (spring plate), thereby moving the protruding member to the release position and adjusting the angle between the active part and the grip part It is.

  According to a further preferred embodiment, the hand tool is a single scissor and the active part comprises a cutting edge.

  According to an alternative preferred embodiment, the hand tool is a single forceps and the active part comprises a chin.

  Preferred embodiments of the present invention will be further described in the following description with reference to the drawings.

FIG. 5 is a perspective view of a single scissor with both grip portions positioned in the outermost position. FIG. 2 is a right side view of the scissors shown in FIG. 1, showing three possible positions of the grip portion of the first element. It is a perspective view from another side of the scissors of FIG. FIG. 2 is a left side view of the scissors shown in FIG. 1, showing three possible positions of the grip portion of the second element. It is a detailed perspective view of the adjustment mechanism of the grip part of a 2nd element. FIG. 6 is a further perspective detail view of the adjustment mechanism shown in FIG. 5. It is sectional drawing from the top of the adjustment mechanism shown by FIG. FIG. 6 is a cross-sectional view of an alternative adjustment mechanism having a chamfered protruding member.

  The hand tool 1 shown in FIGS. 1 to 4 is a single scissor having two elements 2, 32 arranged to pivot about a pivot axis 30. Both elements 2, 32 comprise an active part 4, 34 and a grip part 6, 36. In the case of a single scissor, the active part 4, 34 is a cutting edge.

  In the illustrated scissors 1, the first grip 6 has a thumb hole 8, and the second active portion 34 is provided with a ring finger hole 38 and a little finger tongue 40.

  The active parts 4, 34 and the grip parts 6, 36 are arranged to pivot about the adjustment pivot axis 10, 42 and can lock the active parts 4, 34 and the grip parts 6, 36 in place with respect to each other. Further, locking means 12 and 44 are provided.

  The predetermined positions at which the active portions 4, 34 are adjustable relative to the respective grip portions 6, 36 are defined by the recesses 14, 46. In each case of the illustrated embodiment, three recesses 14, 46 are provided, whereby each element 2, 32 of the illustrated scissors 1 is adjustable in three positions. The active parts 4, 34 and the grip parts 6, 36 pivot during adjustment around the respective pivot axis 10, 42.

  FIG. 2 shows three possible positions of the first element 2 and FIG. 4 shows three possible positions of the second element 32.

  Since both elements 2, 32 are provided with a similar adjustment mechanism, it is sufficient to describe the adjustment mechanism of the second element 32 below with reference to FIGS.

  In the detailed perspective view of FIG. 5, three recesses 46 are provided in the grip portion 36 of the second element 32. In the situation shown, the lower recess 46 is engaged snugly by the locking portion 54 of the protruding member 48. The leaf spring 56 and press portion 50 of the guide portion 52 are shown in broken lines for clarity. The leaf spring 56 is attached to the second element 32 with a bolt 58.

  The protruding member 48 is shown in greater detail in FIG. 6 and comprises a press portion 50, a guide portion 52 and a lock portion 54. When the press portion 50 is pushed by force so that the spring bias of the leaf spring 56 is released, the protruding member 48 moves in the direction of the active portion 34 of the second element 32. As a result, the lock portion 54 slides from the recess 46, and the protruding member 48 is located at the release position. In this release position, the relative position between the grip portion 36 and the active portion 34 is adjustable.

  In order to prevent excessive rotation, a stop projection 62 is provided that abuts the stop portion 64 of the second element 32 in the outermost position.

  As soon as the desired position is set and the press part 50 is released, the leaf spring 56 will again move the protruding member 48 away from the second element 32, thereby locking the protruding member 48 again. Moves into position and prevents further relative rotation of the active portion 34 and the grip portion 36.

  In the preferred embodiment shown, the guide portion 52 is provided with a rotationally asymmetric configuration so that it functions as a longitudinal guide for the projecting member 48 and the projecting member 48 is rotatable about its longitudinal axis. Is disturbed. For this purpose, the non-circular form of the projecting member 48 is enclosed so that it fits snugly by a recess located in the active part 34 of the second element 32.

  FIG. 7 shows a cross section of the second element 32. The recess 60 is provided to allow the second element 32 to be pivotally connected to the first element 2 using the pivot bolt 30.

  An alternative adjustment mechanism is shown in FIG. 8, wherein the protruding member 148 includes a chamfered lock portion 154. In the illustrated embodiment, both the lock portion 154 and the recess 146 are provided with corresponding conical configurations. The leaf spring 56 pushes the protruding member 148 outward in the locked position, and the conical form of the locking portion 154 is thereby pushed against the similar conical form of the recess 146, effectively eliminating the play required for adjustment. The An adjustment mechanism with minimal play is therefore provided.

  While preferred embodiments of the invention are shown, the above embodiments are intended only to illustrate the present invention and do not limit the scope of the invention in any way. Although the present invention has been described with reference to a single scissor, those skilled in the art will recognize that the structure according to the invention is applicable to alternative hand tools including forceps. Although a right-handed hand tool is shown, the present invention is also applicable to universal hand tools and left-handed hand tools.

  Furthermore, while the illustrated embodiment includes three recesses 14, 46 that define a predetermined position in which the active portions 4, 34 are adjustable relative to the respective grip portions 6, 36, the present invention provides three It is explicitly shown that the position is not limited to a predetermined position. The hand tool according to the present invention comprises at least two predetermined positions, but also comprises four or more positions, such as four or five or more.

  Where reference signs are provided to means in the claims, such reference signs serve only to contribute to the understanding of the claims and do not in any way limit the scope of protection.

  It is particularly noted that the person skilled in the art can combine the technical means of the different embodiments.

  The stated rights are defined by the following claims to the extent that many changes can be envisaged.

Claims (12)

A hand tool,
Comprising a first element and a second element arranged to pivot about a pivot axis;
The first and second elements each comprise an active portion and a grip portion;
The active part and the grip part of the first and / or the second element are arranged to pivot about an adjustment pivot axis and lock the active part and the grip part in place relative to each other Hand tool provided with locking means to enable.   The hand tool of claim 1, wherein the active portion and the grip portion of both the first element and the second element are adjustable about an adjustment pivot axis. The locking means is
At least two recesses arranged in the grip part or in the active part;
A protruding member disposed on the grip portion or the other portion of the active portion and movable between a locked position and a released position, wherein the protruding member is one of the recesses. A hand according to any of the preceding claims, wherein the projecting member releases the recess so that the active portion and the grip portion are adjustable relative to each other. tool. The at least two recesses are disposed in the grip portion;
The hand tool according to claim 3, wherein the protruding member is disposed on the active portion and is movable between the locked position and the released position.   The hand tool according to any of the preceding claims, wherein the protruding member is biased by the spring so that the protruding member is pressed against the locked position by a spring.   The hand tool according to claim 5, wherein the spring is a leaf spring disposed on the active portion.   The hand tool according to claim 3, wherein the protruding member includes the guide portion and / or the lock portion having a rotationally asymmetric cross section.   The hand tool according to claim 3, wherein the protruding member includes a lock portion having a chamfered form.   The hand tool according to claim 8, wherein the concave portion is provided with a chamfered shape that cooperates with a chamfered portion of the protruding member.   The hand tool according to claim 9, wherein the protruding member includes a press portion, and the chamfered shape is thickened in a direction away from the press portion.   11. A hand tool according to any one of claims 1 to 10, wherein the hand tool is a single scissor and the active part comprises a cutting edge.   The hand tool according to claim 1, wherein the hand tool is a single forceps, and the active part includes a jaw.

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