CN113399217B - 具有针阀的热熔胶枪 - Google Patents

具有针阀的热熔胶枪 Download PDF

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CN113399217B
CN113399217B CN202110279269.8A CN202110279269A CN113399217B CN 113399217 B CN113399217 B CN 113399217B CN 202110279269 A CN202110279269 A CN 202110279269A CN 113399217 B CN113399217 B CN 113399217B
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理查德·A·贝朗热
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Abstract

本发明涉及一种具有针阀的热熔胶枪，尤其是手持式热熔胶枪，其具有熔融室、针和喷嘴，该喷嘴可相对于所述针移动，以打开或关闭与熔融室流体连通的排出端口。弹簧关闭件将所述针和喷嘴朝着相对位置推压，以关闭排出端口。打开元件使喷嘴相对于所述针移动，以打开排出端口，并且设置有扳机机构，用于使固体胶前进到熔融室中并用于操作所述打开元件。时间延迟机构在排出端口的打开与胶前进到熔融室中之间提供时间延迟。

Description

具有针阀的热熔胶枪
技术领域
本发明涉及用于热熔胶的分配器(例如热熔胶枪)领域。
背景技术
在用户停止分配动作之后，已知的热熔胶枪通常继续分配熔融胶或“液滴”。例如，普通类型的胶枪接收固体胶棒，并具有扳机操作的机构，以响应于用户扣动胶枪的扳机来接合胶棒并使胶棒前进到被加热的熔融室中。通过使胶棒前进到熔融室中而产生的熔融胶中的压力通常会打开胶枪的喷嘴中的球阀，并允许分配熔融胶。然而，如USP10,486,186中所说明的，当胶棒前进到熔融室中时，胶棒中的固体的胶的熔融会引起胶的膨胀。即使在使用者已经释放了扳机机构上的压力之后，由于这种膨胀而在熔融室中产生的压力也趋向于引起熔融胶的继续释放，从而导致滴落(dripping)。
另一种已知类型的喷嘴阀包括位于可移动喷嘴内的静止针。该可移动喷嘴被压缩弹簧推压成与静止针接触，以防止诸如熔融胶之类的材料流过喷嘴。这种类型的喷嘴的一个优点在于其可靠地关闭材料的流动。通常，该喷嘴通过单独的机构被打开，该机构独立于待分配的材料中的压力而操作。这种类型的喷嘴仅用于在所分配的材料中具有可控压力源的胶枪中。一种这样的压力源是可控泵。这种类型的喷嘴尚未与本文中公开的类型的廉价手持式胶枪一起使用，其中，用户挤压扳机以将胶棒推入熔融室来分配胶。
发明内容
根据本发明，一种扳机操作的手持式胶枪设有分配喷嘴，该分配喷嘴包括在可移动喷嘴的空腔中的静止针。即使当熔融胶中的压力趋向于打开喷嘴时，压缩弹簧也将该可移动喷嘴推压在静止针上，以提供可靠的关闭。这有效防止了滴落。
由致动杠杆将可移动喷嘴推离所述针以打开该喷嘴。将该喷嘴推压在所述针上的弹簧足够强，以防止熔融胶的正常压力能够将喷嘴推动到打开，但这可能在使用胶枪时给使用者带来不自然的感觉。也就是说，如果扳机和喷嘴机构同时操作，则用户将经历比预期更大的扳机移动阻力，直到喷嘴打开为止，这时，扳机移动阻力将降至正常水平。
因而，根据本发明，提供了一种机构，以便在施加力以使胶棒前进之前响应于在扳机上施加压力而打开喷嘴。这为使用者提供了与带有弹簧操作式球阀的已知胶枪类似的扳机压力。
在一个实施例中，胶枪扳机机构具有以下特征：它允许扳机在向胶棒前进机构施加力之前移动特定距离，该距离适于允许扳机打开喷嘴。因而，防止了胶棒上的不自然的背压，并且产生了平稳操作。
在优选实施例中，扳机机构中的一个连杆设有狭槽，该狭槽接合在所连接的连杆中的销，以使胶棒的前进相对于喷嘴的打开延迟，由此，在通过胶棒的前进向所述胶施加压力之前，喷嘴已打开。
附图说明
图1是扳机操作的热熔胶枪的一个半部(one half)的侧视图，示出了内部机构以及熔融室和喷嘴机构的竖直截面图。
图2是图1中所示的胶枪的喷嘴部分的放大图。
图3是图1中所示的胶枪的胶棒供给机构的放大图。
具体实施方式
图1示出了手持式胶枪2，其示出了本发明的一个实施例。胶枪2采用扳机操作的机构，其具有扳机4，以使胶棒6前进到胶熔融室8中。熔融室8被保持在壳体10内，图中示出了壳体10的左半部，以示出胶枪2的内部元件。
将参考图2来描述分配喷嘴，图2是胶枪2的前部的放大图。针部分12附接到熔融室8，例如通过螺纹连接而附接到熔融室8，并且与该熔融室流体连通。绝热环16将熔融室8和所述针的一端与壳体10绝热，而第二绝热环18将所述针的向前部分与壳体10绝热。因而，针12相对于壳体10保持静止。喷嘴14以可移动方式附接到所述针，以在分配期间控制熔融胶的流量。熔融胶从该熔融室穿过通道20和交叉钻孔通路(cross-drilled passage)22流入到喷嘴的排出通路24中。喷嘴14和针12之间的接触形成密封点26，该密封点26防止熔融胶的排出。O形环28防止胶在所述针与喷嘴之间向后渗漏，同时允许所述针与喷嘴之间的滑动运动。压缩弹簧30被布置在所述壳体的向前部分与所述喷嘴的凸缘32之间，以向后推压喷嘴14并通过关闭密封点26而停止分配胶。
通过使喷嘴致动杠杆34绕销36旋转以接合凸缘32并且使喷嘴14沿着针12向前滑动来排出胶。在该操作中，喷嘴致动杠杆34被推杆38推动，从而克服由压缩弹簧30施加的回复力而使喷嘴移动。喷嘴14的向前移动使喷嘴从密封点26移开，从而打开喷嘴以通过该喷嘴排出胶。
参考图3，胶枪2设有扳机机构以分配胶。扳机40以枢转方式连接到壳体10，以便于被使用者接合并操作。扳机40设有接触套管42，该接触套管42在扳机被挤压时向后移动，以推动推杆致动器杠杆44的下端。推杆致动器杠杆44以枢转方式安装到所述壳体，使得对所述扳机的致动使推杆致动器杠杆44顺时针旋转，由此，滚柱46接合致动杠杆推杆38的后段39并将其向前推动，从而使喷嘴致动杠杆34移动以打开所述排出喷嘴，如上所述。
力限制弹簧48被置于杠杆推杆的前段38和后段39之间，以防止向致动杠杆推杆34施加过量的力。弹簧48足够刚硬，从而对使用者而言，在该机构内不存在顺应性(compliance)。然而，力限制弹簧48将在胶完全熔融并能够排出之前、在使用者向扳机40施加过量的力的情况下防止该机构的损坏。
扳机机构包括连接在扳机40和胶夹持器52之间的拖曳连杆50。拖曳连杆50经由夹持器销53向胶夹持器52施加力，以使该胶夹持器枢转到与胶棒6接触，然后将夹持器壳体54向前推动，以使胶棒6向前前进到熔融室8中，如USP 4,523,705中进一步说明的。
在拖曳连杆50中设置有长形狭槽(oblong slot)56，以便在以下两方面之间提供时间延迟：一方面是通过向致动推杆38施加力并向喷嘴致动杠杆34施加力以打开喷嘴14，另一方面是胶夹持器52的接合以及夹持器壳体54随后的移动。因而，该胶枪的操作如下：
(a)操作者对工具加电到全热并将胶棒插入，
(b)一旦准备好，使用者对扳机40的致动就首先向致动推杆38、39施加力，这使致动器杠杆34旋转而将可移动喷嘴部分14推离密封点26以打开喷嘴，
(c)然后，拖曳连杆50将向前移动，使得夹持器销53处于狭槽56的后端处并向夹持器施加力，以接合胶棒并使夹持器壳体54与胶棒6一起前进。
上述顺序允许喷嘴的打开与胶棒的前进之间的、所需的定时延迟。通过避免熔融室中的背压(胶棒在喷嘴被压缩弹簧保持关闭时前进将会引起这种背压)，该胶枪平稳地操作。
应当理解，喷嘴致动杠杆34和夹持器壳体54之间的定时操作引起该胶枪的平稳操作，同时允许压缩弹簧的强度比常见的球止回阀中更大。压缩弹簧中的这种增加的强度在使用者释放扳机上的压力时提供喷嘴的更快闭合，并且防止了滴落。此外，由于所述密封点与喷嘴尖端紧密相邻，所述密封点与尖端之间的胶体积非常小，这限制了可能滴落的胶的量。
对于本领域技术人员来说，在所附权利要求书的范围内的修改将是显而易见的。例如，除了长形狭槽56以外的机构(例如松弛的电缆)可以用于提供夹持器壳体的延迟移动。同样，该长形狭槽可以设置在扳机机构中的其他位置。

Claims (4)

1.一种手持式热熔胶枪，包括：熔融室；针；和喷嘴，所述喷嘴能够相对于所述针移动，以操作性地打开或关闭与所述熔融室流体连通的排出端口；关闭元件，所述关闭元件将所述针和所述喷嘴朝着其中所述排出端口关闭的相对位置推压；打开元件，所述打开元件用于使所述喷嘴相对于所述针移动到其中所述排出端口打开的相对位置；以及扳机机构，所述扳机机构使固体胶前进到所述熔融室中并用于操作所述打开元件，其中，所述扳机机构在所述排出端口的打开与所述胶前进到所述熔融室中之间提供时间延迟。
2.根据权利要求1所述的手持式热熔胶枪，其中，所述扳机机构包括：扳机，所述扳机被定位成由使用者接合；胶棒夹持器；以及连杆，所述连杆将所述扳机与所述胶棒夹持器连接，从而所述扳机的激活会使所述连杆移动，以引起胶棒被所述夹持器接合。
3.根据权利要求2所述的手持式热熔胶枪，其中，所述连杆由延迟机构连接到所述夹持器。
4.根据权利要求3所述的手持式热熔胶枪，其中，所述延迟机构是所述连杆中的狭槽和所述夹持器上的销，所述销被接合在所述狭槽中。
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